Emergency Signal Handling in Shared-Frequency Non-Terrestrial Networks
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Solution Overview
Problem
Non-terrestrial cellular networks operating on the same frequency as terrestrial networks experience interference, limiting their geographical coverage for emergency calling and messaging services.
Innovation Solution
A non-terrestrial cellular network operates in a minimal configuration to minimize interference with terrestrial networks, listening for emergency signals in a reduced bandwidth, and switches to a higher activity configuration upon receiving an emergency signal to handle the call.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the non-terrestrial network operates in full configuration to provide emergency services, then emergency service coverage is improved, but interference with the terrestrial network increases
Solution Approach 1:
The non-terrestrial network dynamically switches between minimal configuration (during normal operation) and higher activity configuration (when emergency signal is detected). This dynamic reconfiguration allows the system to provide emergency services when needed while minimizing interference during normal operation, resolving the contradiction between emergency service coverage and interference with terrestrial networks.
Solution Approach 2:
The network changes its operational parameters (bandwidth, power level, configuration mode) based on the detected signal type. When an emergency signal is detected, the system transitions from minimal configuration parameters to higher activity parameters, enabling emergency service provision while managing interference through parameter control.
2Object-generated harmful factors
If the non-terrestrial network operates in minimal configuration to reduce interference, then interference with terrestrial network is reduced, but emergency service capability is limited
Solution Approach 1:
The system performs preliminary detection of emergency signals while operating in minimal configuration. This preliminary action allows the system to maintain low interference during normal operation while being prepared to quickly transition to full emergency service capability when an emergency signal is detected, thus resolving the contradiction between reduced interference and emergency service capability.
Solution Approach 2:
The network dynamically adjusts its configuration based on detected signal types. The system transitions from minimal configuration to higher activity configuration upon detecting an emergency signal, ensuring that emergency service capability is available when needed while maintaining reduced interference during normal operation.
3Productivity
If the non-terrestrial network uses the same frequency as the terrestrial network, then frequency spectrum utilization is improved, but interference between networks occurs
Solution Approach 1:
The non-terrestrial network operates periodically in minimal configuration during normal operation and transitions to higher activity configuration only when emergency signals are detected. This periodic/demand-based operation pattern allows efficient frequency spectrum utilization while minimizing continuous interference with the terrestrial network.
Solution Approach 2:
The system changes its operational parameters (power level, configuration mode, bandwidth) based on the operational state. By using parameter changes, the network achieves efficient spectrum utilization in minimal configuration while controlling interference through parameter adjustment when transitioning to emergency mode.
Data Source
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AI summary
An emergency signal is handled at a first network operated as a non-terrestrial cellular network. The first network operates on a same frequency as a second network, operated as a terrestrial cellular network. The first network is operated in a lower activity configuration, in which interference from the first network to the second network permits normal operation of the second network. In response to receiving the emergency signal from a user equipment at the first network, the first network is set to a higher activity configuration, causing increased interference from the first network to the second network than in the lower activity configuration.