Satellite Random Access Configuration for Mobile Coverage
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Solution Overview
Problem
The discontinuity and mobility of satellite network coverage due to a small number of satellites launched lead to challenges in continuous communication access, as traditional terrestrial base stations have fixed and continuous coverage, whereas satellite cell random access configurations change, making it difficult for satellite terminals to access satellite cells effectively.
Innovation Solution
A random access method is developed where satellite terminals determine and send random access configurations of satellite cells within their coverage, allowing them to select a suitable satellite cell for communication based on matching configurations, which are associated with specific locations and types of terminals or services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite terminals use traditional terrestrial base station access methods, then coverage continuity is maintained in terrestrial systems, but satellite network coverage becomes discontinuous and inaccessible due to satellite mobility
Solution Approach 1:
The patent applies dynamics by making the random access configuration adaptive to satellite mobility. The network device dynamically determines random access configurations based on satellite cell locations and terminal positions, allowing the system to adapt to changing satellite-terminal geometries while maintaining reliable access
Solution Approach 2:
The patent changes key parameters including introducing location-based random access configurations, modifying preamble formats to indicate terminal locations, and adjusting time-frequency resources based on satellite cell positions. These parameter changes enable terminals to access moving satellites effectively
2Measurement precision
If random access configurations are made location-specific for satellite cells, then terminal access accuracy is improved, but system complexity increases due to multiple configurations
Solution Approach 1:
The patent achieves universality by designing a unified random access framework that handles both terrestrial base stations and satellite cells through common procedures. The same random access mechanism works for fixed base stations and moving satellite cells, reducing overall system complexity despite location-specific configurations
Solution Approach 2:
The patent applies local quality by assigning specific random access configurations to different satellite cell locations and terminal types. Each location receives optimized configuration parameters tailored to its specific geometry and service requirements, improving access accuracy without requiring complete system redesign
3Ease of operation
If satellite terminals send random access requests without location-based configurations, then access procedure is simple, but access success rate decreases due to satellite movement
Solution Approach 1:
The patent applies preliminary action by having the network device pre-determine and broadcast random access configurations for different satellite cell locations before terminals attempt access. Terminals receive these configurations in advance through system information, enabling them to perform location-appropriate access procedures without complex real-time calculations
Solution Approach 2:
The patent implements feedback mechanisms where terminals indicate their locations in random access requests using specific preambles or messages. The network device uses this feedback to identify terminal positions and allocate appropriate time-frequency resources, improving access success rates while maintaining procedure simplicity
Data Source
AI summary
Aspects of the disclosure are directed to a random access method that can include determining first information that indicates a random access configuration of a satellite cell. The random access method can further include sending the first information.