Adaptive Waiting Duration for Satellite Random Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In satellite communication networks, the fixed large waiting duration set based on maximum propagation delay leads to excessive random access delay for terminals due to varying propagation delays caused by changing distances between terminals and satellites.
Innovation Solution
An adaptive waiting duration determination method that uses configuration information with multiple waiting durations corresponding to location intervals of a satellite, allowing terminals to determine a target waiting duration based on ready-for-delivery information, thereby reducing waiting time and random access delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the preset waiting duration is set to a fixed large value based on maximum propagation delay, then the terminal can ensure reliable reception of random access response message, but the random access delay increases significantly
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed waiting duration to a dynamic, adaptive waiting duration that changes based on terminal location. The terminal determines its location interval relative to the satellite and selects the corresponding waiting duration from multiple configured values, allowing the system to adapt to varying propagation delays in real-time while maintaining reliable message reception.
Solution Approach 2:
The patent implements parameter changes by configuring multiple waiting durations corresponding to different location intervals. The network side provides a set of waiting duration parameters, and the terminal selects the appropriate parameter based on its current location, thereby changing the waiting duration parameter dynamically to match the actual propagation delay conditions.
2Reliability
If the preset waiting duration is set to accommodate maximum propagation delay, then all terminals can receive responses reliably, but terminals with shorter propagation delays experience excessive waiting time
Solution Approach 1:
The patent applies local quality by providing different waiting duration values for different location intervals. Each location interval has its own optimized waiting duration parameter, allowing terminals in different geographic regions to use locally appropriate waiting times rather than a uniform global value, thus improving overall system efficiency.
Solution Approach 2:
The patent segments the service area into multiple location intervals, each associated with a specific waiting duration. By dividing the coverage area and assigning different parameters to different segments, the system achieves location-specific optimization without affecting other regions, resolving the conflict between reliability and efficiency.
3Loss of time
If the terminal monitors for random access response immediately after sending the message, then the waiting time is minimized, but the terminal may miss the response due to propagation delay variations
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple waiting duration parameters corresponding to different location intervals before the terminal needs to access the network. The network side provides these parameters in advance, and the terminal has them ready for immediate selection based on its location, avoiding any additional delay while ensuring reliable response detection.
Data Source
AI summary
Embodiments of the present disclosure provide a waiting duration determination method, applied to a terminal. The method includes: receiving configuration information, where the configuration information includes N waiting durations corresponding to N location intervals of a satellite, and N is an integer greater than or equal to 2; and determining a target waiting duration from the N waiting durations based on ready-for-delivery information, where the target waiting duration is a waiting duration subsequent to sending the ready-for-delivery information and prior to monitoring response information corresponding to the ready-for-delivery information by the terminal.