Monitoring redundant network coverage in Helsinki Metro tunnels
The metro in the Helsinki metropolitan area is being extended with 13 new stations and once finished it will feature 21 kilometres on underground rail line in two parallel tunnels. The Metro relies on TETRA network to enable reliable communication.
To guarantee coverage in the tunnels, the TETRA service is implemented. As the service is critical for traffic security purposes, the network operator needs a way to verify correct operation of the redundancy solution on continuous basis.