Wake-Up Receiver Synchronization for Low-Latency 5G Battery Saving
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Solution Overview
Problem
5G mobile communication systems face challenges in extending battery life and reducing latency for low-power devices due to high power consumption during frequent wake-up periods, especially in ultrahigh frequency bands where pathloss is significant, and existing methods like extended discontinuous reception (eDRX) are unsuitable for low latency services.
Innovation Solution
Implementing a low-power synchronization signal (LP-SS) with quasi co-location (QCL) to UE devices, allowing efficient beamforming and reduced power consumption by optimizing wake-up periods, thereby enhancing battery life and meeting low latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If extended discontinuous reception (eDRX) is used to extend battery life, then power consumption is reduced, but latency increases making it unsuitable for low latency services
Solution Approach 1:
The patent segments the synchronization signal reception into two distinct modes: wake-up receiver (WUR) for low-power synchronization signal (LP-SS) reception during idle periods, and main receiver for full synchronization signal blocks (SSBs) during active periods. This segmentation allows the device to operate in low-power mode most of the time while maintaining the capability for low-latency response when needed, resolving the contradiction between battery life extension and latency reduction.
Solution Approach 2:
The patent implements periodic wake-up periods where the WUR activates to receive LP-SS signals at predetermined intervals. During these periodic wake-up moments, the device can quickly synchronize and respond to network pages with low latency, while remaining in low-power state between periods. This periodic action pattern achieves both power savings and low latency performance.
2Loss of time
If frequent wake-up periods are used to reduce latency, then response time is improved, but power consumption increases reducing battery life
Solution Approach 1:
The patent introduces the wake-up receiver (WUR) as an intermediary low-power component that handles synchronization signal reception during idle periods. The WUR acts as a mediator between the main receiver and the low-power state, allowing the device to maintain network synchronization and respond to wake-up indications with minimal power consumption, thus improving response time without significantly increasing power usage.
Solution Approach 2:
The patent changes the power consumption parameter by introducing a low-power wake-up receiver operating at significantly lower power levels than the main receiver. The WUR uses reduced power parameters for signal detection and processing, enabling frequent wake-up periods for low latency while maintaining extended battery life through optimized power consumption during idle states.
3Use of energy by moving object
If low-power synchronization signal (LP-SS) with quasi co-location (QCL) is implemented, then power consumption is reduced and battery life is extended, but device complexity increases
Solution Approach 1:
The patent implements quasi co-location (QCL) relationships that allow the WUR to use spatial parameters from the main receiver's beamforming configuration. This multi-functionality approach enables the WUR to leverage existing beamforming resources and spatial information from SSBs, reducing the need for separate complex processing in the low-power receiver and thereby minimizing the increase in device complexity while achieving power savings.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. In accordance with an aspect of the disclosure, a method performed by a user equipment (UE) in a wireless communication system comprises, receiving, from a base station (BS), configuration information for receiving a low-power synchronization signal (LP-SS), identifying a relation of quasi co-location (QCL) between the LP-SS and synchronization signal blocks (SSB) s based on the configuration information, wherein the SSBs are indicated by a field of SSB-PositionInBurst in a system information block 1 (SIB1), and receiving, from the BS, the LP-SS based on the identified relation of the QCL.