Low-Rate Wake-Up Signal Superposition for Fast UE Activation
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Solution Overview
Problem
Existing wireless communication technologies, such as 5G, face challenges in reducing power consumption of user equipment (UE) in idle or inactive states while meeting latency requirements for delay-sensitive services due to periodic wake-up mechanisms like PEI, which cause unnecessary power consumption and delays.
Innovation Solution
A method involving modulating a low-rate wake-up signal with a low-rate modulation scheme and superimposing it with an OFDM signal to create a superimposed signal for transmission, allowing the UE to quickly demodulate and reduce power consumption while ensuring rapid wake-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic wake-up mode is used to ensure UE can receive paging messages, then communication reliability is improved, but power consumption increases significantly
Solution Approach 1:
The patent implements periodic wake-up signals at configurable intervals (e.g., every 10ms, 20ms, 40ms, 80ms, or 160ms) to page UEs in idle or inactive states. This periodic action allows the network to selectively wake up specific UEs only when necessary, rather than requiring all UEs to continuously monitor paging channels, thereby reducing overall power consumption while maintaining reliable message delivery.
Solution Approach 2:
The network sends wake-up signals in advance before actual data transmission or paging messages. This preliminary action allows UEs to wake up proactively and prepare for incoming communications, ensuring they don't miss important messages while avoiding continuous monitoring. The wake-up signal serves as an advance notification that triggers UE activation only when needed.
2Use of energy by moving object
If PEI is used to reduce power consumption by informing UE whether to wake up, then energy efficiency is improved, but wake-up delay increases due to periodic reception
Solution Approach 1:
The patent dynamically adjusts wake-up signal parameters including periodicity, time offsets, and resource allocation based on UE-specific conditions and network requirements. This dynamic configuration allows the system to optimize between power saving and latency for different UEs and service types, enabling rapid wake-up when needed while maintaining energy efficiency for less time-sensitive communications.
Solution Approach 2:
The system changes multiple parameters including wake-up signal periodicity, subcarrier spacing, cyclic prefix length, and time-frequency resource allocation to balance power consumption and latency. By adjusting these parameters, the network can configure wake-up signals for low-latency services with shorter periods and for power-sensitive applications with longer periods, resolving the contradiction between energy efficiency and wake-up speed.
3Speed
If wake-up signal periodicity is reduced to meet latency requirements, then wake-up speed is improved, but power consumption increases
Solution Approach 1:
The patent segments the wake-up signal transmission into different time-frequency resources and groups UEs into different wake-up groups with different periodicities. This segmentation allows the network to assign shorter periodicities to UEs requiring low latency while assigning longer periodicities to UEs that can tolerate higher latency, thereby reducing overall network power consumption while meeting individual UE latency requirements.
Solution Approach 2:
Different wake-up signal configurations with different periodicities and parameters are applied to different UE groups or individual UEs based on their specific service requirements. This local quality approach ensures that each UE receives wake-up signals optimized for its particular needs, allowing rapid wake-up for delay-sensitive services while maintaining energy efficiency for other UEs with less stringent latency requirements.
Data Source
AI summary
The present disclosure provides a wake-up signal processing method. The method includes: a network device modulating a first wake-up signal with a low-rate modulation scheme to obtain a low-rate wake-up signal, superimposing the low-rate wake-up signal with an OFDM signal to obtain a superimposed signal, and transmitting the superimposed signal to a terminal device.