Low Power Wake-Up Signal Design for 5G Energy Efficiency
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Solution Overview
Problem
5G networks face energy efficiency challenges due to increased energy consumption compared to 4G networks, requiring effective low power wake-up signal (LP-WUS) designs to balance quality of service (QoS) and power savings.
Innovation Solution
A method involving network nodes that perform transformations such as discrete Fourier transform (DFT) or least square operations on M-bit on-off keying (OOK) signals to generate LP-WUS with N subcarriers, using inverse fast Fourier transform (IFFT) operations for cyclic-prefix orthogonal frequency-division multiple access (CP-OFDMA), and transmitting these configurations to user equipment (UE) to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If wake-up signal (WUS) is used to save user equipment power, then user equipment power consumption is reduced, but base station power consumption increases
Solution Approach 1:
The patent transforms the WUS signal parameters by converting M-bit OOK signals through DFT/least square operations to generate N-subcarrier LP-WUS signals, then applying IFFT to create the final time-domain signal. This parameter transformation optimizes the signal structure to reduce overall power consumption while maintaining wake-up functionality.
Solution Approach 2:
The patent converts the harmful effect of increased base station power consumption into a benefit by designing an optimized LP-WUS signal structure that actually reduces total network power consumption. The signal transformation process (DFT → least square → IFFT) creates a more efficient transmission that benefits both base station and user equipment power efficiency.
2Productivity
If 5G network bandwidth and spatial multiplexing capabilities are increased, then energy efficiency per bit is improved, but total energy consumption increases
Solution Approach 1:
The patent applies parameter changes by transforming the WUS signal through multiple mathematical operations (DFT, least square, IFFT) to optimize its spectral and temporal characteristics. This creates a signal that leverages 5G's high bandwidth and spatial multiplexing capabilities while minimizing the actual energy required for transmission, thus improving energy efficiency per bit without proportionally increasing total energy consumption.
Data Source
AI summary
Various solutions for low-power wake-up signal (LP-WUS) design with respect to user equipment and network node in mobile communications are described. An apparatus may receive a LP-WUS configuration from a network node. The apparatus may receive a LP-WUS based on the LP-WUS configuration from the network node. The apparatus may determine whether to wake up according to the LP-WUS. The LP-WUS with N subcarriers (SCs) is generated through a transformation of M-bit on-off keying (OOK) in a time domain. The transformation is a discrete Fourier transform (DFT) or least square operation. K samples are generated from the M bits with a signal modification or a signal truncation. The LP-WUS is generated through an inverse fast Fourier transform (IFFT) operation. The K is a size of the IFFT operation of cyclic-prefix orthogonal frequency-division multiple access (CP-OFDMA). The N is less than or equal to the K.