Wake-Up Receiver Architecture for Low-Power Wireless Signal Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting and receiving reference signals, particularly in reducing power consumption of user equipment (UE) while maintaining low latency and coverage, especially for latency-critical applications.
Innovation Solution
The introduction of a low-power wake-up signal (LP-WUS) and a separate low-power wake-up receiver (LP-WUR) in the UE, utilizing non-coherent detection methods such as on-off keying (OOK) and frequency shift keying (FSK), allowing for efficient power management by triggering a main receiver only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main receiver is continuously activated to ensure low latency and reliable signal reception, then the response time and reliability are improved, but the power consumption increases
Solution Approach 1:
The receiver is segmented into two distinct parts: a low-power wake-up receiver that continuously monitors for wake-up signals, and a main receiver that remains dormant until triggered. This segmentation allows the system to maintain reliability through continuous monitoring while dramatically reducing power consumption by keeping the power-intensive main receiver off during idle periods.
Solution Approach 2:
The wake-up receiver performs preliminary detection of incoming signals before activating the main receiver. By预先 detecting wake-up signals and preparing the system in advance, the wake-up receiver enables the main receiver to be activated only when necessary, thus maintaining reliable signal reception while minimizing unnecessary power consumption.
2Speed
If the main receiver is frequently activated to meet latency requirements, then the response time is improved, but the battery life decreases
Solution Approach 1:
The receiver architecture is divided into a low-power wake-up receiver for continuous monitoring and a high-performance main receiver for active communication. This segmentation enables the system to maintain fast response times by quickly detecting wake-up signals while extending battery life by minimizing the activation duration of the power-intensive main receiver.
Solution Approach 2:
The wake-up receiver operates periodically in a low-power state, checking for incoming signals at intervals. When a wake-up signal is detected, it triggers the main receiver to activate. This periodic operation pattern allows the system to maintain responsive communication while significantly reducing average power consumption compared to continuous main receiver operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces power consumption in UE devices by minimizing unnecessary wake-up cycles, thereby extending battery life and meeting latency requirements for critical applications.
Implementation Method 1
utilizing non-coherent detection methods such as on-off keying (OOK) and frequency shift keying (FSK)
Implementation Method 2
utilizing non-coherent detection methods such as on-off keying (OOK) and frequency shift keying (FSK)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present disclosure provides a method and apparatus for transmitting and receiving signals in a wireless communication system. According to the method and apparatus, a low-power wake-up signal (LP-WUS) may be received through a first receiver, and a second receiver may be triggered based on the reception of the LP-WUS. A length L_w of an on-off keying (OOK) symbol of the LP-WUS is determined based on (i) a length N_ofdm of an orthogonal frequency division multiplexing (OFDM) symbol, (ii) a length N_cp of a cyclic prefix (CP) duration of the OFDM symbol, and (iii) a number N of OOK symbols corresponding to the length of the OFDM symbol.