Two-Part Low Power Wake-Up Signal for 5G Latency and Power Trade-off
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Solution Overview
Problem
Current 5G devices face challenges in balancing battery life and latency due to high power consumption, particularly in idle states, which is not suitable for applications requiring immediate responses like fire detection and extinguishment, where long discontinuous reception cycles result in high latency and excessive power usage.
Innovation Solution
A low-power wake-up signal with two parts is introduced, where a wake-up receiver with ultra-low power consumption monitors for the signal and triggers the main receiver to turn on only when necessary, using a two-part structure in the time domain with coherent detection methods like ON-OFF Keying or Frequency Shift Keying modulation, allowing the device to wake up only when triggered by the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If long DRX cycle is used to reduce power consumption, then battery life is improved, but latency increases which is not suitable for services requiring immediate response
Solution Approach 1:
The wake-up signal is divided into two parts: part 1 serves as an indicator that part 2 is coming, allowing the UE to enter a low-power state after detecting part 1 without missing the complete signal. This segmentation enables longer DRX cycles while maintaining low latency response capability.
Solution Approach 2:
Part 1 of the wake-up signal is transmitted before part 2, serving as a preliminary indication to the UE that a wake-up signal is incoming. This allows the UE to prepare for wake-up in advance while still maintaining a low-power state, resolving the contradiction between power saving and response time.
2Loss of time
If UE periodically wakes up once per DRX cycle to monitor for signals, then latency is reduced, but power consumption increases significantly during periods with no traffic
Solution Approach 1:
The network transmits part 1 of the wake-up signal periodically at configured intervals, allowing the UE to monitor for wake-up indications without continuously activating the main receiver. This periodic transmission pattern enables the UE to maintain low power consumption while still being able to respond promptly when part 1 is detected.
3Loss of time
If short DRX cycle is used to reduce latency, then response time is improved, but power consumption increases making battery life short
Solution Approach 1:
By segmenting the wake-up signal into two parts and using part 1 as an early indicator, the system can use longer DRX cycles without sacrificing response time. The UE wakes up only when part 1 is detected, eliminating unnecessary wake-ups during no-traffic periods while maintaining fast response capability when data is actually available.
Data Source
AI summary
Various embodiments herein provide techniques for a low power wake-up signal (LP-WUS) with two parts. The LP-WUS may be received by a wake-up receiver of a user equipment (UE) and used to trigger a main receiver of the UE to wake up (e.g., turn on or enter a higher power state). The first part may be used to indicate the presence and/or other characteristics of the second part. The first and second parts may each be transmitted in one or more symbols, slots, or time resource units. Other embodiments may be described and claimed.