Mobile Craft Control via Cellular Network Bridging
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Solution Overview
Problem
The wireless link between a controller and a mobile craft, such as a quadcopter, can degrade due to distance or interference, leading to uncontrolled movement of the craft as communication is lost.
Innovation Solution
The controller and mobile craft independently detect threshold degradation of the short-range wireless link and switch to a cellular wireless connection, communicating through a network-based control server to maintain control communication, allowing the controller to continue controlling the mobile craft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direct short-range wireless communication is used between controller and mobile craft, then control responsiveness and simplicity are improved, but communication reliability deteriorates when distance increases or interference occurs
Solution Approach 1:
The patent introduces a cellular network as an intermediary communication path between the controller and mobile craft. When the direct short-range link degrades, the system automatically switches to using cellular base stations as mediators to relay control commands and telemetry data, thereby maintaining communication reliability without sacrificing the simplicity of the control interface.
Solution Approach 2:
The system dynamically switches between two communication modes: direct short-range wireless communication for normal operation (when reliability is sufficient) and cellular network-mediated communication when the direct link degrades. This dynamic adaptation allows the system to optimize between responsiveness and reliability based on real-time link quality conditions.
2Reliability
If cellular wireless connection with control server is established, then communication reliability is improved when direct link degrades, but device complexity and energy consumption increase
Solution Approach 1:
The system maintains both short-range and cellular communication capabilities but dynamically activates only the necessary path based on link quality. The complexity of maintaining dual communication systems is justified by the fact that the cellular path is only actively used when the direct link degrades, providing reliability improvement without constant complexity overhead.
Solution Approach 2:
The controller and mobile craft independently monitor their direct wireless link quality and autonomously decide when to switch to cellular communication based on pre-defined degradation thresholds. This self-service mechanism eliminates the need for complex external coordination or manual intervention, allowing the system to adapt to changing conditions automatically.
3Reliability
If cellular radio is activated and cellular connection is acquired, then control continuity is improved during link degradation, but energy consumption increases
Solution Approach 1:
The cellular radio remains in a low-power standby state and is only fully activated when the direct short-range link degrades below a threshold. This dynamic activation strategy ensures control continuity is maintained only when necessary, minimizing energy consumption while providing backup communication capability when reliability is compromised.
Solution Approach 2:
The system pre-configures cellular communication capabilities but keeps them dormant until needed. By monitoring direct link quality in advance and switching to cellular mode before complete link failure occurs, the system ensures control continuity while avoiding unnecessary energy expenditure on maintaining active cellular connections during normal operation.
Data Source
AI summary
Disclosed is a method and system to help facilitate continued control of a mobile craft in a situation where the wireless link between the controller and mobile craft degrades. In accordance with the disclosure, the controller and mobile craft will each independently detect threshold degradation of their direct wireless link and will each respond to its detecting of the threshold degradation by acquiring a cellular wireless connection with a cellular radio access network and communicating via its acquired cellular wireless connection with a network-based control server. The control server will then automatically bridge together its communication with the controller and its communication with the mobile craft so as to enable the controller to continue controlling the mobile craft.