Multi-Modem Vehicle Control for Seamless Wireless Handover
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Solution Overview
Problem
Existing vehicle control systems in mine sites experience delays and losses in packet communication during handover processes, leading to potential handover failures and safety risks, which affect productivity and efficiency.
Innovation Solution
A vehicle control system with an on-board terminal equipped with multiple wireless modems, each having different handover thresholds, to manage handovers efficiently and minimize communication disruptions by prioritizing earlier received packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a handover process is performed when a vehicle moves across cells, then the vehicle can maintain wireless communication coverage, but delays and packet losses occur in packet communication during the handover process
Solution Approach 1:
The system performs preliminary actions by establishing a connection with the target wireless base station before the vehicle actually moves into its coverage area. The on-board terminal proactively connects to the target base station in advance, so that when handover is needed, the connection is already established, eliminating delays and packet losses during the handover process.
2Reliability
If multiple wireless modems are used with different handover thresholds, then handover failures are prevented and communication reliability is improved, but device complexity increases
Solution Approach 1:
The system applies local quality by configuring different handover thresholds for different wireless modems based on their specific characteristics and coverage areas. Each modem has an optimized threshold suitable for its local communication environment, allowing reliable handover execution without requiring all modems to have identical configurations, thus managing complexity while maintaining reliability.
Data Source
AI summary
Provided is a vehicle control system that can prevent delays and losses in packet communication, prevent handover failures, and improve productivity while ensuring safety for various types of vehicles. The vehicle control system includes an on-board terminal mounted on a vehicle and including a plurality of wireless modems; a plurality of wireless base stations that wirelessly communicate with the on-board terminal, and form a plurality of cells; and a vehicle central control device that communicates with the on-board terminal via one of the wireless base stations. Each of the plurality of wireless modems is configured to be able to, when the vehicle moves across the plurality of cells, execute a handover to switch a connection to one of the plurality of wireless base stations to another. Each of the plurality of wireless modems is configured to be able to set threshold for executing the handover different from the others.