Tunnels and Subways Installtion

Delivering a reliable and seamless mobile communications for underground subway and tunnels presents operators with many challenges due to the limitation of RF propagation and penetration. For the most part subscribers in these areas are unable to receive mobile signals to establish a call connection. In order to provide coverage to these areas, a cost effective and reliable solution may come from a RF or fiber optical repeater.

Deployment example 1:A 4km tunnel is served with two 5W repeaters.

As the diagram illustrates, donor antennas are located on both ends of the tunnel. Signals received from the BTS are amplified and then projected into the tunnel through the service antenna, providing coverage to the length of the tunnel.

Deployment example 2: Fiber Optical Repeater with micro-cell

Solution to provide coverage to underground sub-ways, a mix of micro-cell and fiber optical repeater will enable an operator to provide full coverage to the underground subway network.

With the fiber optical repeaters, consisting of a master and a remote unit, signal is tapped from the micro-cell, where the master unit will convert to an optical signal for transport down the fiber cable to the remote unit; in turn the remote unit will re-convert the optical signal back to RF signal and boost the signal for distribution via antennas or leaky cables providing further coverage in the subway.