Flying-Vehicle Wireless Communication Handover by Cell Counting
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Solution Overview
Problem
Conventional handover technologies fail to provide stable communication for mobile terminals in the sky due to the inability to identify appropriate wireless base stations, leading to unstable communication conditions caused by multiple base stations with similar reception quality.
Innovation Solution
A wireless communication device for flying vehicles that includes a cell counter to track cell changes, a communication controller to adjust selection methods based on cell count thresholds, and a moving direction determination to switch between sky and ground communication strategies, along with authentication and handover parameter management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover technology is used to select wireless base stations based on position information and reception quality, then ground mobile terminals can maintain stable communication, but mobile terminals in the sky cannot acquire information about appropriate handover destinations due to multiple base stations with similar reception quality
Solution Approach 1:
The patent applies local quality by introducing altitude-based differentiation in handover parameters. Different sets of handover parameters are configured for different altitude ranges, allowing the system to adapt specifically to sky terminal conditions rather than using uniform ground-based parameters. This resolves the contradiction by making the handover mechanism locally optimized for aerial environments where multiple base stations have similar reception quality.
Solution Approach 2:
The patent implements dynamics by making handover parameters changeable based on terminal altitude. The system dynamically selects appropriate handover parameter sets according to the terminal's vertical position, transitioning from ground-optimized parameters to sky-optimized parameters as altitude increases. This dynamic adaptation enables reliable communication for sky terminals while maintaining compatibility with ground terminals.
2Adaptability or versatility
If the number of wireless base stations serving as handover destinations increases due to good visibility in the sky, then more signal options are available, but communication stability deteriorates due to failure to obtain information about the appropriate handover destination
Solution Approach 1:
The patent applies parameter changes by modifying handover decision criteria based on altitude. Specific handover parameters such as threshold values, hysteresis margins, and evaluation weights are adjusted according to the terminal's vertical position. This allows the system to effectively manage the increased number of available base stations in the sky by applying sky-optimized parameters that prevent unnecessary handovers and maintain communication stability.
3Reliability
If handover parameters are optimized for ground terminals, then ground communication performance is improved, but sky terminal communication fails due to inappropriate parameter settings
Solution Approach 1:
The patent implements universality by creating a multi-functional handover parameter system that serves both ground and sky terminals. Multiple parameter sets are configured, and the system automatically selects the appropriate set based on terminal altitude. This universal design allows the same handover mechanism to effectively serve both ground-based and aerial terminals without requiring separate systems, resolving the contradiction between ground optimization and sky compatibility.
Data Source
AI summary
A wireless communication device installed in a flying vehicle, includes a wireless communication part configured to receive a wireless signal transmitted from a wireless base station, a cell counter configured to count the number of cells corresponding to wireless base stations identified by wireless signals received by the wireless communication part, and a communication controller configured to change a communication party selecting method to select the wireless base station serving as a communication party from among a plurality of wireless base stations serving as communication party candidates when an increment or a decrement of a unit-time cell count representing the counting result of the cell counter in a predetermined time is equal to or more than a predetermined threshold.