Wake-Up Receiver Triggering for Low-Power 5G Signal Reception
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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) through the introduction of low-power wake-up signals and receivers, which are critical for improving energy efficiency and meeting latency requirements in 5G devices.
Innovation Solution
The implementation of low-power wake-up signals (LP-WUS) and receivers (LP-WUR) using non-coherent detection methods, such as MC-OOK and MC-FSK waveforms, to reduce power consumption by utilizing existing OFDM transmitters and minimizing the need for power-hungry RF modules, along with synchronization signals for LP-WUR synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional wake-up signals are used in wireless communication systems, then signal transmission can be achieved, but power consumption of user equipment increases
Solution Approach 1:
The patent divides the receiver into two distinct parts: a low-power wake-up receiver (LP-WUR) for detecting wake-up signals and a main receiver (MR) for normal communication. This segmentation allows the UE to maintain ultra-low power consumption during idle states while ensuring reliable signal transmission when needed, directly resolving the contradiction between power savings and transmission reliability.
Solution Approach 2:
The wake-up signal acts as an intermediary that triggers the transition from low-power state to active state. The LP-WUR detects this intermediary signal, which then activates the MR only when necessary, reducing overall power consumption while maintaining the ability to transmit and receive signals reliably when required.
2Use of energy by moving object
If low-power wake-up receivers are introduced to reduce power consumption, then energy efficiency improves, but device complexity increases
Solution Approach 1:
By segmenting the receiver architecture into LP-WUR and MR components with distinct functions, the patent manages complexity through clear separation of concerns. Each component is optimized for its specific purpose, making the overall system more manageable despite the added architectural layer.
Solution Approach 2:
The LP-WUR operates autonomously in ultra-low power mode to monitor for wake-up signals without requiring the main processor or MR to be active. This self-service capability allows the system to maintain energy efficiency while the autonomous LP-WUR handles the complexity of continuous monitoring independently.
3Loss of time
If continuous receiver operation is maintained to ensure immediate signal reception, then latency is reduced, but power consumption increases
Solution Approach 1:
The LP-WUR performs preliminary monitoring of wake-up signals in ultra-low power mode before activating the full MR. This preliminary action ensures that when actual communication is needed, the MR can be activated quickly, minimizing latency while keeping power consumption low during idle periods.
Solution Approach 2:
The system uses periodic wake-up signal monitoring through the LP-WUR instead of continuous MR operation. This periodic action at ultra-low power levels maintains the ability to detect signals promptly while dramatically reducing average power consumption compared to continuous reception.
Data Source
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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 signal may be received through a first receiver, and a second receiver may be triggered based on the reception of the signal. Based on a bandwidth for the second receiver including a plurality of first subcarriers, positions of second subcarriers allocated to the signal among the first subcarriers may be determined based on a time-domain index for the second receiver.