NTN LEO Satellite Service Continuity Through Inter-Satellite Handover
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Solution Overview
Problem
Existing satellite communication systems face limitations such as high propagation delay, signal attenuation, and difficulty in providing coverage to sparsely populated areas and polar regions, making it challenging to construct a cost-effective global communication network.
Innovation Solution
A non-geostationary orbit (NGSO) satellite system utilizing low Earth Orbit (LEO) satellites for minimized propagation delay, secure global coverage, and efficient network configuration through inter-satellite communication, with devices on satellites capable of identifying alternative satellites for service continuity and transmitting configuration messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a terrestrial network is constructed to provide wireless communication services, then coverage can be provided in populated areas, but it becomes difficult to construct in sparsely populated areas and polar regions
Solution Approach 1:
The patent introduces satellites as intermediary nodes to provide communication services in areas where terrestrial network construction is difficult. The satellites act as mediators between ground terminals in remote areas and the core network, enabling coverage in sparsely populated areas and polar regions without requiring extensive ground infrastructure.
Solution Approach 2:
The patent transitions from a two-dimensional terrestrial network layout to a three-dimensional space-based network architecture. By deploying satellites in orbit, the system adds the spatial dimension to network coverage, allowing services to reach areas that are inaccessible or economically unviable for ground-based infrastructure.
2Area of stationary object
If a satellite communication system is deployed to provide global coverage, then service can be provided in remote areas, but propagation delay and signal attenuation increase
Solution Approach 1:
The patent changes the orbital parameters of satellites, specifically using low Earth orbit (LEO) satellites at altitudes of 500-2000 km, compared to traditional geostationary satellites at 35,786 km. This parameter change reduces the distance between satellites and ground terminals, thereby minimizing propagation delay while maintaining global coverage capability.
3Area of stationary object
If traditional satellite systems are used to provide communication services, then coverage can be extended, but service continuity becomes challenging due to satellite movement and coverage gaps
Solution Approach 1:
The patent segments the coverage area into multiple zones served by different LEO satellites. As satellites move across the sky, terminals can switch between satellites serving different segments, ensuring continuous coverage. This segmentation approach allows the system to maintain service continuity despite individual satellite movement and limited dwell times over specific areas.
Solution Approach 2:
The patent implements preliminary action by establishing inter-satellite links and pre-configuring handover procedures before service interruptions occur. Satellites maintain connections with neighboring satellites and prepare for seamless terminal handovers, ensuring that service continuity is maintained without interruption as terminals move between coverage zones.
Data Source
AI summary
In embodiments, a device of a first satellite for providing non-terrestrial network (NTN) access is provided. The device may comprise memory including instructions, at least one processor, and at least one transceiver. The instructions may, when executed by the at least one processor, cause the device to perform a communication between a first terminal and a second terminal via the first satellite, by transmitting data received from the first terminal to the second terminal or transmitting data received from the second terminal to the first terminal; identify, within a satellite group associated with the first satellite, a second satellite different from the first satellite; and transmit a configuration message including configuration information related to the communication to the second satellite through the at least one transceiver.