Terminal Device Wake-Up Signal Detection Using PDCCH Occasion Subsets
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Solution Overview
Problem
In 5G NR systems, terminal devices experience high power consumption when detecting wake-up signals on multiple PDCCH monitoring occasions during the DRX state, leading to reduced power saving gains due to unnecessary wake-ups and potential scheduling delays.
Innovation Solution
A method where a terminal device or network device determines a subset of PDCCH monitoring occasions to detect the wake-up signal before the active time DRX ON, minimizing power consumption and scheduling delays by selecting occasions closest or farthest to DRX ON, or using a preset mapping rule to randomize detection occasions, thereby optimizing power usage and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device detects the WUS signal on all PDCCH monitoring occasions in the receive time window, then the reliability of wake-up signal detection is improved, but the power consumption increases and power saving gain is reduced
Solution Approach 1:
The patent segments the PDCCH monitoring occasions into a subset to be detected rather than detecting all monitoring occasions. The terminal device is configured to detect WUS signals on only M specified monitoring occasions out of N total monitoring occasions, where M < N. This segmentation approach maintains adequate detection reliability while significantly reducing power consumption by skipping unnecessary monitoring occasions.
Solution Approach 2:
The patent applies local quality by selectively detecting WUS signals only at specific monitoring occasions that are most likely to contain the signal. The network device determines which monitoring occasions to detect based on factors such as time proximity to DRX ON, search space set characteristics, or random selection, thereby concentrating detection efforts where they are most effective rather than uniformly across all occasions.
2Loss of energy
If the terminal device detects the WUS signal on more PDCCH monitoring occasions, then the power saving gain is reduced due to unnecessary wake-ups, but the scheduling delay is minimized
Solution Approach 1:
The patent implements preliminary action by having the terminal device detect WUS signals in advance before the DRX ON period. The receive time window is configured to end before the DRX ON starts, allowing the terminal device to perform wake-up signal detection during the DRX OFF period. This preliminary detection action enables the terminal device to wake up at the optimal time without unnecessary early wake-ups, thereby reducing power consumption while maintaining scheduling efficiency.
3Adaptability or versatility
If the receive time window includes sending cycles of multiple search space sets, then the coverage of wake-up signal detection is improved, but the number of PDCCH monitoring occasions increases leading to higher power consumption
Solution Approach 1:
The patent applies partial action by configuring the terminal device to detect WUS signals on only a subset of PDCCH monitoring occasions rather than all possible monitoring occasions across multiple search space sets. The network device determines M monitoring occasions from the available N occasions, where M < N, thereby performing only the necessary minimum detection actions to maintain adequate coverage while avoiding excessive power consumption.
Data Source
AI summary
Example wake-up signal detection methods and apparatus are described. One example method includes determining, by a terminal device, N physical downlink control channel (PDCCH) monitoring occasions before an active time DRX ON. The terminal detects a wake-up signal (WUS) on M PDCCH monitoring occasions of the N PDCCH monitoring occasions, where M is less than N, and both N and M are positive integers greater than 1.