Dynamic Random Access Windows for Satellite Communication Delays
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Solution Overview
Problem
In satellite communication systems, the large distance between a satellite base station and a terminal device results in delays, causing random access failures due to the terminal device's inability to receive the random access response within the designated window.
Innovation Solution
The terminal device determines a first time offset of the random access response window based on the distance to the satellite base station, using information such as orbit altitude and speed of light, and adjusts the window accordingly to improve reception accuracy and success rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses a fixed random access response window, then the device complexity is low, but the random access success rate deteriorates due to large propagation delay in satellite communication
Solution Approach 1:
The terminal device performs preliminary calculation of the time offset based on satellite orbit altitude information before receiving the random access response. This advance preparation allows the device to adjust the response window timing accurately, ensuring successful reception despite large propagation delays in satellite communication
Solution Approach 2:
The random access response window is transformed from a fixed structure to a dynamic one that can be adjusted based on calculated time offsets. The window's starting position and duration are modified according to the satellite's orbit altitude, enabling the system to adapt to varying propagation delays while maintaining operational reliability
2Measurement precision
If the terminal device receives the random access response based on a fixed random access response window, then the ease of operation is high, but the measurement precision of response reception timing deteriorates
Solution Approach 1:
The terminal device changes the timing parameters of the random access response window by calculating a time offset based on satellite orbit altitude. This parameter adjustment aligns the window's starting position and duration with the actual propagation delay, significantly improving the precision of response reception timing
3Reliability
If the random access response window is adjusted based on satellite distance, then the random access success rate improves, but the device complexity increases due to additional calculations
Solution Approach 1:
The terminal device performs self-service by autonomously calculating the time offset using publicly available satellite orbit altitude information and standard physics formulas. This self-calibration mechanism enables the device to adapt to satellite communication delays without requiring complex external control systems or additional hardware
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the flexibility and accuracy of receiving the random access response, thereby increasing the success rate of the random access process in satellite communication.
Implementation Method 1
The terminal device determines a first time offset of a first random access response window based on information about a distance between a satellite base station and the ground
Data Source
AI summary
This disclosure provides satellite communication methods and apparatuses. One example method includes that a terminal device determines a first time offset of a first random access response window based on a distance information between a satellite base station and the ground. Based on the first time offset and the first random access response window, the terminal device receives a random access response sent by the satellite base station.