Wake-Up Signal Synchronization Using Complex Sequences
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Solution Overview
Problem
The sensitivity of wake-up signal (WUS) reception in terminal devices is poor due to demodulation using envelope detection, which retains only amplitude information, leading to inefficient power consumption in wireless communication systems.
Innovation Solution
A signal transmission method using complex sequences for generating synchronization signals to improve receiver sensitivity by retaining both amplitude and phase information, allowing for better time and frequency synchronization, and reducing network resource overheads by reusing existing synchronization sequences and resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If envelope detection is used for WUS demodulation, then the implementation is simple, but the receiver sensitivity is poor because only amplitude information is retained
Solution Approach 1:
The patent changes the detection parameter from envelope detection (amplitude only) to correlation detection, which can extract both amplitude and phase information. This parameter change in the detection method enables the WUR to achieve better sensitivity while maintaining reasonable implementation complexity
Solution Approach 2:
The patent introduces a reference signal as an intermediary element. The WUR uses this reference signal to perform correlation detection with the received WUS, enabling the extraction of phase information without significantly increasing system complexity. The reference signal acts as a mediator that facilitates sensitive detection
2Measurement precision
If complex sequences are used for signal generation, then phase information is retained and sensitivity improves, but the processing complexity increases
Solution Approach 1:
The patent makes the WUR capable of processing complex sequences, extending its functionality beyond simple amplitude detection. This multi-functionality allows the low-power receiver to handle both amplitude and phase information, improving sensitivity without requiring a fully-featured main receiver
Solution Approach 2:
The WUR generates or acquires reference sequences locally to perform self-correlation detection on received signals. This self-service capability enables the low-power receiver to extract phase information independently, reducing the need for complex centralized processing
3Measurement precision
If separate synchronization signals are introduced, then time and frequency synchronization accuracy improves, but network resource overhead increases
Solution Approach 1:
The patent designs synchronization signals that serve multiple functions simultaneously: they provide both time synchronization and frequency synchronization, and also facilitate WUS detection. This multi-functionality reduces the need for separate dedicated signals for each purpose, thereby reducing overall resource overhead
Solution Approach 2:
The patent merges the synchronization function with the WUS detection function by using correlated reference sequences. The same reference signal structure is used for both synchronization acquisition and wake-up signal detection, combining multiple functions into a unified signal framework that reduces resource consumption
Data Source
AI summary
Embodiments of this application provide a signal transmission method and a communication apparatus, to improve sensitivity of WUS reception. The method includes: generating a first signal based on a first sequence, where the first sequence is a complex sequence, and the first signal indicates a first terminal device whether to enter a first state; generating a first synchronization signal based on a second sequence, where the second sequence is a first synchronization sequence or a second synchronization sequence, the first synchronization sequence is a complex sequence, the second synchronization sequence is a binary sequence, and the first synchronization signal is for time and/or frequency synchronization; and sending the first signal and the first synchronization signal to the first terminal device.