TETRA coverage assured in tunnel network
"We wanted to build the network to redundant status by bringing the signals to the tunnels from different base stations"
When Finnish energy production company Helsingin Energia Oy sought to enhance TETRA network coverage in its underground network of tunnels beneath Helsinki it turned to Creowave to provide coverage with TETRA Indoor and Hybrid Repeaters.
The project, which started in 2009, involved enhancing TETRA network coverage inside service tunnels beneath the city, which include plants such as district heating pipes. The tunnels are used by Helsingin Energia personnel as well as various service people.
The challenge of being able to communicate in the multi-kilometre tunnel network was just one element of the tasks to be addressed. By their nature, tunnels are a challenging working environment but, when you add to that the potential safety threatening situations the district heating network can cause if there is a leak in a pipe or valve, the challenge is magnified. Faults in heating pipes could lead to large amounts of hot water or steam getting into the tunnel system and workers need reliable communications for vital safety if such a problem occurs.
The network, called HelenNet, was built to cover every tunnel of Helsingin Energia’s tunnel system to assure the safety of workers and help personnel communicate in the course of their everyday work, says Markus Weinström, who is responsible for the maintenance and installations of the TETRA network.
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Source: www.wireless-mag.com
