In 2010, the Metropolitan Transit Authority (MTA) announced that it would begin to roll out Wi-Fi and cellular voice and data service in New York City subway stations. The announcement launched an infrastructure project that would involve feeding miles of optical cable under the city streets and building a wireless network that supported several major wireless carriers. An independent benchmarking firm, Global Wireless Solutions (GWS), recently evaluated the current status of the project. The firm tested which stations commuters could expect to successfully connect to Wi-Fi and cellular networks and what kind of quality they could expect.
The wireless infrastructure is being installed by Transit Wireless, a New York-based company formed explicitly to design Wi-Fi and cellular coverage in the New York City subway. The firm—a subsidiary of Broadcast Australia—won the contract from the MTA in 2007 to build out the network and maintain the infrastructure for 25 years. Once the network is installed, commuters will be able to connect to AT&T, Sprint, T-Mobile USA, and Verizon Wireless networks, or sign on to Wi-Fi via the Transit Wireless network.
The tests showed that the project, which is scheduled for completion in 2018, is still a work in progress. GWS tested 67 underground stations with access to the public transit network and revealed that stations on the Q line provide the highest quality of experience on mobile phones. On the other hand, the 4 line was the worst-performing for Wi-Fi connections, with only 2 of 22 stations having access to Wi-Fi networks. In addition, the tests confirmed that six stations had no detectable Wi-Fi signals.
The underground network is based on the concept of a distributed antenna system (DAS). RF nodes are installed in each station and send out signals to other antennas in the station, providing cellular voice and data coverage through the carrier networks, or Wi-Fi service through the Transit Wireless network. According to Nathan Cornish, director of RF engineering at Transit Wireless, the RF nodes are connected back to the Transit Wireless base station hotel via optical fiber. In the base-station hotel, the major cellular carriers each operate a separate base station and equipment supporting 3G, 4G, and LTE networks.