Mobile Communication Device Radio Wave Monitoring and Switching
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Solution Overview
Problem
Mobile communication devices mounted on moving objects, such as trains, need to constantly monitor radio wave conditions across multiple communication media to select the best medium for data communication with ground base stations, leading to increased processing load.
Innovation Solution
A mobile communication device equipped with a radio wave condition monitoring unit, storage unit, and switching control unit that pre-identifies optimal communication media for different travel sections and switches between them only at preset boundaries, reducing unnecessary monitoring and processing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile communication device constantly monitors radio wave conditions of multiple communication media to select the best medium for data communication, then the quality of radio communication with ground base stations is improved, but the processing load on the mobile communication device increases
Solution Approach 1:
The route is divided into multiple travel sections, with each section pre-assigned a specific communication medium. The mobile communication device only needs to monitor which travel section it is currently in and switch between pre-determined communication media, rather than continuously monitoring all available communication media throughout the entire route. This segmentation approach significantly reduces processing load while maintaining communication quality.
Solution Approach 2:
Communication medium information is determined in advance for each travel section before the mobile object actually travels through them. The system pre-identifies the optimal communication medium for each section based on expected radio wave conditions, so that during actual operation, the device only needs to follow the pre-determined switching schedule rather than making real-time decisions about all communication media.
2Measurement precision
If the mobile communication device monitors radio wave conditions of all communication media throughout the entire route, then the selection of optimal communication medium is improved, but the energy consumption increases due to continuous monitoring
Solution Approach 1:
Instead of continuously monitoring all communication media throughout the entire route, the system performs monitoring only at specific periodic intervals - namely, when the mobile object enters or exits a travel section boundary. This periodic monitoring approach maintains accurate communication medium selection while dramatically reducing energy consumption compared to continuous monitoring.
3Reliability
If the mobile communication device switches communication media frequently to maintain optimal radio wave conditions, then the quality of data communication is improved, but the device complexity and control difficulty increase
Solution Approach 1:
The route is segmented into travel sections with stable radio wave characteristics, and communication media are assigned to each section. This segmentation reduces the frequency of switching operations compared to continuous adaptation, as the device only needs to switch when transitioning between predefined sections rather than responding to every minor change in radio wave conditions.
Data Source
AI summary
A mobile communication device includes: a monitoring unit that monitors conditions of communication media; a control unit that controls switching communication media based on information indicating a communication medium having a good condition in each of a plurality of travel sections; and a switching unit that switches the communication medium to be used, wherein when a mobile object moves from a first section to a second section, the control unit causes the monitoring unit to monitor, in an area including a boundary between the first and second sections, radio wave conditions of a first communication medium having a good radio wave condition in the first section and a second communication medium having a good radio wave condition in the second section, and instructs the switching unit to perform switchover from the first communication medium to the second communication medium, based on results from the monitoring unit.