Wireless Signal Processing for Satellite Terrestrial Network Handover
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Solution Overview
Problem
Satellite-based cellular communication systems face overload and reduced usability due to prioritization of satellite base stations over terrestrial ones, leading to inadequate service provision, especially for emergency calls.
Innovation Solution
An electronic device equipped with a communication circuit and processor that searches for and connects to a terrestrial network within a specified distance, determining if an emergency call is supported on a lower-priority network, and performs a camp-on operation to monitor system and paging information in the newly selected cell, thereby reducing satellite base station overload and enhancing service usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the electronic device prioritizes connection to satellite base stations, then coverage area is improved, but base station overload occurs and service reliability deteriorates
Solution Approach 1:
The electronic device dynamically adjusts network selection based on real-time conditions. When satellite network signal strength is above a first threshold, the device connects to the satellite base station to expand coverage. When signal strength falls below the threshold, the device switches to terrestrial network to ensure service reliability, preventing base station overload while maintaining dynamic coverage optimization.
Solution Approach 2:
The patent implements threshold-based parameter changes for network selection. A first threshold determines when to connect to satellite network (for coverage expansion), while a second threshold determines when to switch to terrestrial network (for reliability). These parameter changes enable the system to balance coverage area and service reliability by adjusting network selection based on signal strength conditions.
2Area of stationary object
If the electronic device connects to satellite base station with highest priority, then coverage is extended, but specific services (e.g., emergency call) may fail
Solution Approach 1:
The electronic device dynamically evaluates service availability alongside coverage considerations. When satellite network signal strength exceeds the first threshold, the device connects to extend coverage. When signal strength drops below the threshold, the device switches to terrestrial network to ensure specific services like emergency calls remain available, thus dynamically balancing coverage extension with service accessibility.
Solution Approach 2:
The patent uses threshold parameters to control network selection behavior. The first threshold enables coverage extension by connecting to satellite network when conditions are favorable. The second threshold ensures service availability by switching to terrestrial network when satellite signal is insufficient, guaranteeing access to critical services regardless of coverage optimization goals.
3Speed
If the electronic device attempts data transmission through terrestrial network, then transmission speed is improved, but satellite base station overload increases
Solution Approach 1:
The electronic device dynamically selects network based on signal strength thresholds to balance speed and load. When satellite network signal is strong (above first threshold), the device uses satellite network for data transmission, maintaining high speed while distributing load away from terrestrial base stations. When satellite signal is weak (below second threshold), the device switches to terrestrial network, ensuring acceptable transmission speed while preventing satellite base station overload.
Solution Approach 2:
The patent implements threshold-based parameter changes to regulate network selection for data transmission. The first threshold parameter enables high-speed transmission through satellite network when signal conditions permit, reducing terrestrial base station load. The second threshold parameter ensures minimum transmission speed by switching to terrestrial network when satellite signal deteriorates, preventing satellite base station overload.
Data Source
AI summary
An electronic device may include: a communication circuit configured to support cellular communication through a terrestrial network and a non-terrestrial network, a memory configured to store mapping data obtained by mapping identification information of the non-terrestrial network and a service supported by the non-terrestrial network, and at least one communication processor. One or more of the at least one communication processor may be configured to: search for a cell corresponding to another network within a specified distance with reference to a location of the electronic device, based on the non-terrestrial network having a highest priority with respect to communication connection, determine, based on another network having a lower priority than the non-terrestrial network being found, whether an emergency call is supported on another network having the lower priority, and perform, based on the emergency call being supported on another network having the lower priority, camp-on on another network having the lower priority, wherein the camp-on includes monitoring, by the electronic device, system information and paging information in a newly selected cell based on cell reselection.