Pico Cell Frequency Overlay for Aircraft Interference
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Solution Overview
Problem
The interference between pico cell type wireless communication systems in moving vehicles, such as aircraft, and public mobile communication systems poses a challenge, as transmissions from airborne devices can disrupt ground-based communications, requiring a solution that does not involve extensive modifications to the vehicle.
Innovation Solution
Coordinating the frequencies of the pico cell system with those used by public wireless communication systems in the surrounding region, including dynamic frequency control based on the vehicle's location, to minimize interference by operating on frequency bands allocated for different protocols or technologies, such as using guard bands or overlaying narrowband and broadband services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pico cell system operates on same frequency band as public wireless network, then communication coverage is improved, but interference with ground-based communications increases
Solution Approach 1:
The pico cell system dynamically adjusts its operating frequency band based on the vehicle's location and detected ground-based network protocols. The system transitions between different frequency bands (e.g., GSM 850, GSM 1900, CDMA 800, CDMA 1900) as the vehicle moves through different geographic regions, ensuring optimal coverage while minimizing interference with local ground-based communications.
Solution Approach 2:
The system changes the operating frequency parameter according to the detected public wireless communication protocol in the surrounding region. By monitoring the protocol type (GSM, CDMA, etc.) and adjusting the frequency band accordingly, the system resolves the contradiction between maintaining coverage and avoiding interference with ground-based networks.
2Object-generated harmful factors
If frequency coordination with public wireless networks is implemented, then interference is reduced, but system complexity increases
Solution Approach 1:
The pico cell system continuously monitors the wireless environment to detect the type of public wireless communication network present in the surrounding region. This feedback mechanism enables the system to automatically identify the active protocol (GSM, CDMA, etc.) and adjust its operating frequency accordingly, reducing interference without requiring complex manual configuration.
Solution Approach 2:
The system autonomously manages frequency coordination by detecting ground-based network protocols and self-adjusting its operating band. The pico cell controller automatically performs frequency selection and protocol adaptation without external intervention, simplifying deployment while maintaining low interference levels through intelligent frequency management.
3Object-generated harmful factors
If dynamic frequency control based on vehicle location is implemented, then interference mitigation is improved, but device complexity increases
Solution Approach 1:
The system pre-configures multiple frequency bands corresponding to different public wireless communication protocols (GSM 850, GSM 1900, CDMA 800, CDMA 1900) before operation. When the vehicle is deployed, the system already has the necessary frequency options ready, eliminating the need for complex real-time frequency synthesis or hardware reconfiguration during operation.
Solution Approach 2:
The pico cell system is designed to support multiple frequency bands and protocol types within a single platform. By integrating capability to operate across GSM 850, GSM 1900, CDMA 800, and CDMA 1900 bands, the system achieves universal compatibility with different ground-based networks, simplifying the control architecture while enabling adaptive frequency selection for interference mitigation.
Data Source
AI summary
To ameliorate interference between an indoor wireless pico cell system, for example in an aircraft, and public wireless communications systems operating in a surrounding or over-flown area, frequencies of operation of the indoor system are coordinated with those used by the public wireless systems in the surrounding area. The pico cell system operates one type of service on all or a portion of a band used for a different type of service by the public system. In the aircraft example, a pico cell system might support GSM narrowband service and CDMA broadband service. The airborne GSM operations use a portion, e.g. corresponding to a guard band, of CDMA service spectrum in the terrestrial network. The airborne CDMA service uses a band used for GSM service by the terrestrial network. The pico cell system dynamically changes its frequency band(s), as the aircraft flies over different areas.