Wake-Up Signal Scheduling Across DRX Cycles for Power-Delay Balance
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing power consumption and data transmission delays during Discontinuous Reception (DRX) states, particularly in managing wake-up signals (WUS) to balance terminal states between wake-up and sleep modes.
Innovation Solution
A method and apparatus for determining the frequentness of wake-up signals (WUS) applied to different types of cycles, allowing terminals to maintain sleep or wake-up states during On Durations based on monitoring results, with specific settings for DRX cycles and adjustments via RRC messages or MAC CEs to minimize power consumption and data delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal monitors the wake-up signal continuously to determine terminal state, then the accuracy of terminal state determination is improved, but the power consumption increases
Solution Approach 1:
The patent applies periodic action by configuring the terminal to monitor wake-up signals at specific intervals rather than continuously. The network side device configures monitoring parameters including monitoring windows and periodicity, allowing the terminal to wake up and monitor PDCCH at predetermined intervals during DRX cycles. This periodic monitoring approach reduces power consumption compared to continuous monitoring while maintaining sufficient accuracy for determining whether to enter sleep mode or maintain wake-up state.
2Use of energy by moving object
If the terminal enters sleep mode during On Duration to save power, then power consumption is reduced, but data transmission delays increase
Solution Approach 1:
The patent applies preliminary action by having the network side device send wake-up signals in advance before the actual data transmission period. The wake-up signal is transmitted during a predetermined period before the PDCCH monitoring window, allowing the terminal to determine ahead of time whether it needs to remain in wake-up state or can enter sleep mode. This advance notification mechanism enables the terminal to optimize power consumption without causing data transmission delays, as the wake-up decision is made before data reception is required.
3Reliability
If the network sends wake-up signals frequently to ensure terminal wakes up, then the reliability of wake-up is improved, but the overhead of signaling increases
Solution Approach 1:
The patent applies local quality by differentiating wake-up signal transmission based on specific conditions and scenarios. Rather than sending wake-up signals uniformly in all cases, the network configures different wake-up signal transmission strategies for different DRX cycles, terminal states, and network conditions. The wake-up signal is selectively transmitted based on whether the terminal is in first DRX cycle or second DRX cycle, and based on network scheduling decisions. This conditional transmission approach maintains wake-up reliability for terminals that need to wake up while reducing overall signaling overhead by avoiding unnecessary wake-up signals.
Data Source
AI summary
Embodiments of the present disclosure provide a wake-up signal processing method, a communication device and a communication system. The method includes: determining frequentnesses Ni of a wake-up signal being applied to different types of first cycles, wherein each Ni is a number of a corresponding first cycle in which the terminal maintains in a sleep state during an On Duration, and a value of Ni is 0 or a positive integer; and according to at least one of the frequentnesses Ni or the wake-up signal, determining a terminal state during the On Duration in a corresponding type of the first cycle, wherein the terminal state is a wake-up state or the sleep state.