Satellite Random Access Window Timing for Long-Delay Links
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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 significant delays, leading to random access failures due to the terminal device being unable to receive the random access response within the predefined 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 predefined random access response window, then the procedure is simple, but the terminal device cannot receive the random access response due to large delay in satellite communication
Solution Approach 1:
The patent applies the dynamics principle by making the random access response window adjustable rather than fixed. The terminal device dynamically determines a first time offset based on distance information (orbit altitude) and adjusts the response window timing accordingly. This allows the system to adapt to varying satellite-terrestrial distances while maintaining procedural simplicity through automated adjustment mechanisms.
Solution Approach 2:
The patent implements parameter changes by modifying the timing parameter of the random access response window. The terminal device calculates a time offset based on distance information and uses this to determine when to expect the random access response. By changing the temporal parameter dynamically based on actual distance conditions, the system resolves the contradiction between reliability and complexity.
2Ease of operation
If the terminal device waits for random access response within a fixed window, then the operation is straightforward, but the large distance causes the response to arrive after the window expires
Solution Approach 1:
The patent applies preliminary action by having the terminal device proactively determine and adjust the random access response window timing before the actual response reception. The terminal calculates the time offset based on distance information in advance and pre-adjusts the window, ensuring the response will be received within the adjusted window rather than waiting passively for a fixed window to expire.
Solution Approach 2:
The patent implements feedback by using distance information (orbit altitude) as input to dynamically adjust the response window. The terminal device incorporates feedback about the actual communication distance to modify the timing parameters, creating a closed-loop system that adapts to real conditions and prevents time loss without complicating the overall operation.
3Reliability
If the terminal device uses standard terrestrial communication timing, then the procedure is simple, but the satellite distance causes significant delay making random access fail
Solution Approach 1:
The patent applies self-service by having the terminal device autonomously determine the time offset based on its own distance information (orbit altitude). Rather than requiring complex centralized coordination or manual configuration, the terminal independently calculates and adjusts its random access response window using readily available distance parameters, maintaining simplicity while improving reliability.
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 may determine 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.