Satellite Paging Area Segmentation and Threshold Reporting
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Solution Overview
Problem
Non-geosynchronous satellite communication systems face challenges in efficient location reporting and paging due to the dynamic movement of satellites and user terminals, leading to difficulties in maintaining continuous communication links and optimizing resource allocation.
Innovation Solution
Implementing a system that includes network access controllers (NACs) to manage location reporting and paging by detecting changes in user terminal locations, forwarding paging messages between satellite network entities, and using threshold-based reporting to optimize communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellites move in non-geosynchronous orbits to provide global coverage, then communication coverage area is improved, but satellite position stability deteriorates
Solution Approach 1:
The patent implements dynamic location reporting where user terminals continuously report their locations to network access controllers as satellites move through their orbits. This dynamic approach allows the system to adapt to changing satellite positions while maintaining accurate location tracking for communication handoffs between satellites.
Solution Approach 2:
The system employs feedback mechanisms where user terminals report location information back to the network access controllers, which then use this information to determine appropriate paging areas and manage handoffs. This feedback loop enables the system to respond to satellite motion and maintain stable communication despite orbital movement.
2Reliability
If user terminals continuously report location to track satellite movement, then communication link reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent implements threshold-based location reporting where user terminals only report location changes when the change exceeds a predetermined threshold. This selective reporting approach reduces unnecessary signaling while ensuring that significant location changes are captured to maintain communication reliability during satellite handoffs.
3Area of stationary object
If the system pages user terminals across multiple satellite footprints, then paging coverage is improved, but paging complexity increases
Solution Approach 1:
The patent divides the satellite network into multiple network access controllers, each responsible for a specific geographic area or satellite footprint. This segmentation allows paging to be localized to specific regions rather than broadcast system-wide, reducing paging complexity while maintaining broad coverage through coordinated multi-controller operation.
Data Source
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AI summary
The disclosure relates in some aspects to location reporting and paging for satellite communication. In one aspect, the disclosure relates to a user terminal (UT) sending a message to report information about the UT's location. A threshold may be used to control whether (e.g., when) the UT reports its location. The location information may be used to enforce area (e.g., country) restrictions for the UT. In one aspect, the disclosure relates to forwarding paging messages between network access controllers. For example, a network access controller that is not able to page a UT may forward a paging message to another network access controller. In one aspect, the disclosure relates to a list of paging areas that indicates where a UT need not perform a paging area update.