Wake-Up Signal Detection Using ZC Synchronization Offset Correction
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Solution Overview
Problem
Existing methods fail to correctly detect wake-up signals due to frequency offsets, leading to increased power consumption in terminal devices.
Innovation Solution
Utilizing a synchronization signal with a Zadoff-Chu (ZC) sequence and its conjugate sequence for time synchronization, allowing the terminal device to adjust the detection window for wake-up signals based on estimated frequency offsets, reducing power consumption without increasing detection window length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device uses a fixed detection window for wake-up signal detection, then the device complexity is reduced, but detection accuracy deteriorates when frequency offset exists
Solution Approach 1:
The patent applies dynamics by making the detection window position adjustable rather than fixed. The terminal device dynamically shifts the detection window position based on estimated frequency offset values, allowing the system to adapt to frequency variations while maintaining a simple fixed-structure detection window design
Solution Approach 2:
The patent changes the position parameter of the detection window based on frequency offset estimation. By adjusting the detection window position parameter dynamically according to the estimated frequency offset, the system maintains detection accuracy without increasing structural complexity
2Measurement precision
If the terminal device increases the detection window length to accommodate frequency offset, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent uses dynamics to shift the detection window position based on frequency offset estimation rather than expanding the window length. This dynamic positioning approach maintains detection accuracy while keeping the detection window length constant, thereby avoiding increased power consumption
3Speed
If the terminal device performs correlation processing without frequency offset compensation, then the processing speed is maintained, but detection reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by performing frequency offset estimation before wake-up signal detection. The terminal device first estimates the frequency offset using synchronization signals, then uses this estimation to adjust the detection window position, ensuring reliable detection before the actual correlation processing occurs
Solution Approach 2:
The patent introduces frequency offset estimation as an intermediary step between synchronization and wake-up signal detection. This intermediary process provides correction information that improves detection reliability without significantly impacting overall processing speed
Data Source
AI summary
A terminal device receives a synchronization signal from a network device. The synchronization signal is generated based on a synchronization sequence, the synchronization sequence includes a first ZC sequence and a conjugate sequence of the first ZC sequence, or the synchronization sequence includes a sum of the first ZC sequence and the conjugate sequence of the first ZC sequence. The terminal device detects a wake-up signal based on the synchronization signal. The terminal device thus can perform time synchronization based on the synchronization signal, to estimate a time offset of a correlation peak offset caused by a frequency offset of the synchronization signal.