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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Application Scenarios for Vehicle-Ground Fast Link Handover

Application Scenarios for Vehicle-Ground Fast Link Handover

PIS used in urban rail transit delivers media news, sports events, advertisements, as well as notices, and train departure and arrival time to passengers. Nowadays, PIS is deployed by more and more rail transit enterprises. As an integral part of the PIS, the vehicle-ground communication subsystem enables moving trains to communicate with the ground network. With Mesh-based vehicle-ground fast link handover technology, the vehicle-ground communication subsystem offers high-quality data channels for vehicle-ground communications. Capitalizing on convenient and cost-effective WLANs, the vehicle-ground communication subsystem brings significant economic benefits to rail transit enterprises. As shown in Figure 13-9, a rail transit enterprise deploys trackside APs along the track and vehicle-mounted APs on the train. As the train moves forward, the working vehicle-mounted AP keeps switching connections with trackside APs through vehicle-ground fast link handovers to ensure reliable data communications.

Figure 13-9  Networking diagram of vehicle-ground fast link handovers

If the vehicle-mounted AP in the front fails, the network is faulty, affecting vehicle-ground communication. To improve vehicle-ground communication network reliability, you can configure Bidirectional Forwarding Detection (BFD) and Virtual Router Redundancy Protocol (VRRP) for vehicle-mounted APs. BFD is used to detect faults. When a fault is detected, VRRP allows for a switchover. As shown in Figure 13-10, VRRP is configured for the uplinks and downlinks of vehicle-mounted APs. In normal cases, the vehicle-mounted AP in the front transmits data. When BFD detects a link fault on this vehicle-mounted AP, a VRRP switchover is performed, and data is transmitted by the vehicle-mounted AP in the rear.

You can also configure VRRP load balancing for vehicle-mounted APs in the front and rear.

Figure 13-10  VRRP and BFD applications for vehicle-ground fast link handovers

Updated: 2019-01-11

Document ID: EDOC1000176006

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