While commonplace in Japan, cell phone coverage in metro tunnels remains scarce in Europe. But Vodafone has helped remedy this shortcoming by advising how coverage could be achieved using antennas and cellular amplifiers within the core network of Munich metro or subway system.
The company said that, having conducted extensive propagation tests, over 400 cellular antennas and around 100 amplifiers had been installed in approximately 75-kilometres of metro tunnel and in the 89 stations. The antennas are spaced between 300 metres and three kilometres apart depending on the RF conditions within each section of tunnel.
The underground system is connected using fibre optic links and managed by a central switching point. Voice and data calls are routed via this central switch to participating operators.
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