LP-WUS DRX Wake-Up Control for Power and Delay Balance

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing communication systems face challenges in balancing power-saving and service delay in scenarios like 5G NR, particularly with the introduction of ultra-low power wake-up signals (LP-WUS) that require more efficient DRX mechanisms to minimize power consumption while maintaining quick service recovery.

Innovation Solution

Implementing a DRX method that utilizes an LP-WUS to trigger a main radio for PDCCH monitoring by starting a drx-onDuration timer after a first time offset, allowing the terminal device to enter DRX active time promptly, thereby saving power and minimizing delay.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the terminal device uses traditional DRX mechanism without LP-WUS, then the main radio remains in sleep state saving power, but the service delay increases due to longer wake-up time

Engineering Contradiction:

Improvepower consumptionVSAvoidservice delay

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The LP-WUS is received and processed in advance before the main radio needs to wake up for PDCCH monitoring. The timer is started at a first time after LP-WUS reception, allowing the main radio to be activated promptly with minimal delay while maintaining power-saving benefits.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The LP-WUS acts as an intermediary signal that triggers the main radio wake-up process. Instead of the main radio continuously monitoring or waiting for full activation, the LP-WUS serves as a low-power wake-up indicator that initiates the transition to active state through timer-based control.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If the terminal device continuously monitors PDCCH, then service response is immediate, but power consumption increases significantly

Engineering Contradiction:

Improveservice response speedVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

Instead of continuous PDCCH monitoring, the terminal uses periodic DRX cycles with controlled wake-up periods. The LP-WUS triggers a timer that determines when the main radio should be active for PDCCH monitoring, creating a periodic monitoring pattern that balances responsiveness with power saving.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The terminal device autonomously manages its own wake-up schedule using the timer mechanism. Upon receiving LP-WUS, the terminal self-determines when to activate the main radio based on the timer configuration, eliminating the need for continuous network control while maintaining efficient power management.

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP4615068A1Discontinuous reception method, terminal device, and network device

Publication Date: 2025.09.10 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

Figure 1~2
Figure 3A~3B
Figure 4~6

AI summary

The disclosure relates to a discontinuous reception (DRX) method, a terminal device, and a network device. The method can include the following. A terminal device starts a first timer at a first time after a time when a low-power wake-up signal (LP-WUS) is received by the terminal device, where the first timer is a drx-onDuration timer. In embodiments of the disclosure, the terminal device restarts the first timer at the first time after the time when the LP-WUS is received by the terminal device, and thus the terminal device can enter DRX as soon as possible and save power.