Satellite TRS Wake-Up Synchronization Under Delay Jitter
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Solution Overview
Problem
Terrestrial wireless communication networks face challenges in providing global signal coverage, especially in areas like islands and deserts, necessitating satellite-based solutions, which suffer from synchronization issues due to long distances and delay jitter affecting data transmission quality.
Innovation Solution
A method involving satellites sending configuration information for tracking reference signals (TRS) to terminals to synchronize wake-up times, allowing terminals to determine optimal synchronization parameters and reduce delay jitter, enhancing synchronization accuracy and data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite communication is used to achieve global signal coverage, then coverage area is improved, but synchronization accuracy deteriorates due to long distances and delay jitter
Solution Approach 1:
The satellite sends the tracking reference signal (TRS) before the terminal wakes up to perform synchronization. This preliminary transmission allows the terminal to achieve accurate time and frequency synchronization upon waking, compensating for the long propagation delay and delay jitter inherent in satellite communication.
Solution Approach 2:
The patent replaces traditional synchronization methods with a tracking reference signal mechanism. The TRS provides continuous tracking information that allows terminals to maintain synchronization despite the dynamic nature of satellite movement and varying propagation conditions, substituting mechanical timing methods with signal-based tracking.
2Measurement precision
If terminal wakes up earlier to receive TRS, then synchronization accuracy is improved, but energy consumption increases
Solution Approach 1:
The satellite performs the action of sending TRS in advance before the terminal wakes up. This shifts the timing burden to the network side, allowing the terminal to wake up at its scheduled time, receive the pre-sent TRS, and perform synchronization without needing to wake up earlier, thus avoiding additional energy consumption.
Solution Approach 2:
The TRS provides feedback information about time and frequency offsets to the terminal. This feedback mechanism allows the terminal to achieve accurate synchronization with minimal wake-up time, reducing the need for extended active periods and associated energy consumption.
3Device complexity
If TRS is sent at fixed time positions, then system complexity is reduced, but adaptability to delay jitter deteriorates
Solution Approach 1:
The patent makes the TRS transmission dynamic by allowing flexible time domain positioning. The TRS can be sent at different time positions according to actual propagation conditions and satellite motion, enabling the system to adapt to varying delay jitter while maintaining manageable complexity through standardized signal structures.
Solution Approach 2:
The system changes the time domain parameter of TRS transmission dynamically. By adjusting when and where TRS is transmitted in the time domain, the system adapts to changing propagation conditions and delay jitter characteristics without fundamentally changing the signal structure or increasing system complexity.
Data Source
AI summary
A method for wireless communication is performed by a satellite and includes: sending configuration information of a tracking reference signal (TRS) of at least one beam to a terminal; wherein the configuration information is at least configured to indicate a first time domain position of the TRS sent by the satellite; the TRS is used for synchronization between the terminal and the satellite; and the first time domain position is configured for the terminal to determine a wake-up time of the terminal in a ratio resource control (RRC) idle state.