Synchronization Signal Reception via Wake-Up Receiver
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Solution Overview
Problem
Wireless communication devices face challenges in minimizing power consumption and prolonging battery life due to the need to monitor downlink control channels for synchronization signals, which requires using the more power-intensive main receiver instead of the wake-up receiver.
Innovation Solution
Designing a synchronization signal that can be received using a wake-up receiver, allowing time and frequency synchronization without the need to power up the main receiver, by overlapping or closely timing synchronization signal occasions with wake-up signal occasions and using less complex, more power-efficient receiver circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the main receiver is used to receive synchronization signals, then synchronization accuracy is improved, but power consumption increases
Solution Approach 1:
The patent segments the receiver functionality by introducing a wake-up receiver that is specifically designed to receive wake-up signals and synchronization signals, separating this function from the main receiver. This allows the device to use the low-power wake-up receiver for synchronization tasks while reserving the main receiver for more demanding communication tasks, thus resolving the contradiction between synchronization accuracy and power consumption.
2Use of energy by moving object
If the wake-up receiver is used to receive synchronization signals, then power consumption is reduced, but receiver capability is limited
Solution Approach 1:
The patent enhances the wake-up receiver's capability by enabling it to perform multiple functions: receiving wake-up signals, receiving synchronization signals (PSS/SSS), and providing timing information for downlink reception. This multi-functionality allows the wake-up receiver to handle synchronization tasks effectively, reducing the need for the main receiver to be activated and thus lowering power consumption while maintaining necessary receiver capabilities.
3Difficulty of detecting and measuring
If synchronization signal occasions are separated from wake-up signal occasions, then signal reception is simplified, but device complexity increases
Solution Approach 1:
The patent merges the wake-up signal occasion and synchronization signal occasion by configuring them to overlap in time or occur at the same time. This allows the wake-up receiver to simultaneously perform both wake-up signal detection and synchronization signal reception, simplifying the overall signal reception process while reducing device complexity compared to handling separate occasions.
Data Source
AI summary
A first communication node (12) monitors for a wake-up signal (20) during a wake-up signal occasion (20-O), and monitors for a synchronization signal (16) in a synchronization signal occasion (16-O). In one embodiment, the synchronization signal occasion (16-O) at least partially overlaps in time with the wake-up signal occasion (20-O). In another embodiments, the synchronization signal occasion (16-O) occurs in time before or after the wake-up signal occasion (20-O). In this latter case, the synchronization signal occasion (16-O) and the wake-up signal occasion (20-O) may be consecutive occasions in time or may have a gap in time between them. In case there is a gap in time between the occasions, the gap may be a function of a cell identifier, a carrier frequency, a numerology or subcarrier spacing, a periodicity of the wake-up signal occasion (20-O), and/or a discontinuous reception cycle length.