Satellite Uplink Timing Synchronization for Time-Varying Propagation Delays
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Solution Overview
Problem
The large propagation delay and time-varying nature of satellite communication due to long distances and satellite movement pose challenges in synchronizing uplink signals between terminals and base stations in satellite networks, which are not adequately addressed by existing 5G communication systems.
Innovation Solution
A method and device that involve a terminal receiving scheduling offset information from a base station to correct time-varying propagation delays by identifying transmission timing for uplink signals based on a k value, allowing accurate synchronization and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite communication is used to extend coverage area, then communication coverage is improved, but propagation delay increases
Solution Approach 1:
The base station pre-calculates and provides timing offset information to the terminal before uplink transmission. This preliminary action allows the terminal to compensate for propagation delay in advance, ensuring synchronized reception at the base station despite the long satellite communication path.
Solution Approach 2:
The base station measures the actual arrival time of uplink signals and provides feedback in the form of timing offset information to terminals. This feedback mechanism enables continuous optimization of transmission timing to maintain synchronization despite varying propagation conditions.
2Reliability
If satellite movement is considered to maintain coverage, then communication reliability is improved, but timing synchronization becomes more complex
Solution Approach 1:
The base station acts as an intermediary that centralizes the complexity of tracking satellite movement and calculating timing offsets. Instead of requiring each terminal to independently track and compensate for satellite motion, the base station performs these calculations and distributes the results to terminals, simplifying terminal design while maintaining synchronization accuracy.
Solution Approach 2:
The system dynamically adjusts the timing offset parameter based on satellite position and movement. By changing this critical timing parameter in response to satellite motion, the system maintains reliable communication without requiring complex terminal-side tracking mechanisms.
3Measurement precision
If timing offset correction is implemented, then signal synchronization is improved, but system complexity increases
Solution Approach 1:
The base station serves as an intermediary that centralizes the complex tasks of measuring signal arrival times, calculating timing offsets, and managing synchronization. This approach achieves precise synchronization while keeping terminal devices simple, as they only need to receive and apply the timing offset information provided by the base station.
Data Source
AI summary
The disclosure relates to a communication technique that converges a 5G communication system for supporting a higher data rate after a 4G system with IoT technology, and a system thereof. The disclosure can be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, and the like) based on 5G communication technology and IoT related technology. The disclosure discloses a method and device for a terminal to perform satellite communication.