Wake-Up Signal Detection Using a Timing Reference Signal
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Solution Overview
Problem
The clock drift between the terminal device and the network device leads to timing mismatches in the detection of Wake Up Signals (WUS), affecting the reliability and increasing power consumption in low-power wake-up receivers.
Innovation Solution
A method where a first signal is used to determine whether and how to detect a second signal for waking up the main radio, reducing complexity and power consumption by clarifying the time-frequency resources for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device uses a low-power wake-up receiver to detect WUS, then power consumption is reduced, but detection reliability deteriorates due to clock drift between terminal and network devices
Solution Approach 1:
The patent introduces a first signal as an intermediary that carries timing reference information. This first signal acts as a mediator between the network device's clock and the terminal device's wake-up receiver, allowing the terminal to synchronize its detection timing without requiring the main radio to be continuously active, thus maintaining low power consumption while improving detection reliability through accurate timing alignment
Solution Approach 2:
The network device sends the first signal before the WUS to establish timing reference in advance. This preliminary action allows the terminal device to pre-synchronize its clock or adjust its detection window based on the timing information in the first signal, ensuring that the WUS detection occurs at the correct time despite clock drift, thereby resolving the reliability issue while maintaining low-power operation
2Reliability
If the terminal device continuously monitors for WUS, then detection reliability is improved, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the terminal device uses periodic action by first detecting the first signal at specific intervals to obtain timing reference information, then using this information to determine the appropriate detection window for the WUS. This periodic approach with intelligent timing determination maintains detection reliability while significantly reducing power consumption compared to continuous monitoring
Solution Approach 2:
The patent makes the WUS detection process dynamic by allowing the terminal device to adjust its detection timing and window based on the timing reference information obtained from the first signal. This dynamic adaptation enables the system to maintain high detection reliability while minimizing the duration and intensity of receiver activation, thereby reducing overall power consumption
3Measurement precision
If the terminal device uses the main radio to detect signals, then detection performance is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent segments the detection function into two parts: a simple low-power wake-up receiver that detects the first signal and extracts timing reference information, and the main radio that is activated only when needed based on this timing information. This segmentation allows the majority of detection operations to be performed by the simpler, lower-power component, reducing overall device complexity and power consumption while maintaining detection performance through coordinated operation of both segments
Data Source
AI summary
Signal detection methods and apparatus, a terminal device and a network device are provided. The method includes that a terminal device detects a first signal. The first signal is used for at least one of: determining whether to detect a second signal, or determining at least one of a time domain resource for detecting the second signal or a frequency domain resource for detecting the second signal. The second signal is used for waking up a main receiver of the terminal device.