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Wenzhou Rail Transit Success Story

Line S1 (Phase I) of Wenzhou Rail Transit goes through the Wenzhou South Railway Station in the Ouhai District, Wenzhou West Railway Station, Wenzhou East Long-Distance Bus Station, Wenzhou Olympic Sports Center, Yongqiang Airport, and other important commercial centers and transportation hubs, involving complex structures such as underground railways, overhead railways, and mountain tunnels. Compatible with 120 km/h speed, Line S1 goes above and below the ground with a total length of 53.507 km. There are 19 stations alone the line, of which 2 are above the ground, 14 are overhead stations, and 3 are below the ground. The minimum distance between stations is 1.16 km, average distance is 2.735 km, and the maximum distance is 7.096 km. The Wenzhou Rail Transit project uses a TD-LTE frequency band of 1.8 GHz, with a bandwidth of 10 MHz, uplink design capacity of 8 Mbps, and downlink design capacity of 7 Mbps.


ZTE Corporation provides an end-to-end radio communication system solution based on TD-LTE technologies for Line S1 of Wenzhou Rail Transit, providing the following services:


 Passenger Information System (PIS): This is an integrated multimedia information system. By relying on multimedia network technologies and using LTE networks for data transmission, this system allows passengers to get train operation information and public media information through the display terminals deployed in the station hall, on the platforms, at the entrances, in the passenger compartments, and on the train.


 Closed-Circuit Television (CCTV) system for rail transit: This system plays HD CCTV contents smoothly on the train by using high-bandwidth and low-delay TD-LTE technologies.


 Trunked train dispatching system: This is the world's first broadband trunking solution based on TD-LTE technologies, which greatly improves train dispatching efficiency.


To transmit various train information, this project has the following features:


 Both leaky coaxial cables and ceiling antennas are used. Leaky coaxial cables are used for rail and underground tunnel coverage, and directional ceiling antennas are used for coverage in indoor scenarios, such as parking lots, control centers, and stations.


 Advanced high-speed switching algorithms are used to eliminate the impact of Doppler frequency offset on signal transmission on high-speed trains. This method ensures highly efficient radio signal transmission without any data interruption on a train that runs at a speed of up to 120 km/h.


 A nine-level Quality of Service (QoS) model is used for allocation of radio resources, incorporating various types of data associated with subway lines and guaranteeing the use of radio resources.


ZTE has achieved great success in the Line S1 project of Wenzhou Rail Transit. This project not only meets the requirements for voice and data communications between fixed users (such as users in the control center and depot, parking dispatchers, and station attendants) and mobile users (such as train drivers and attendants), but also provides high-speed and reliable data services to meet the train-to-ground communications requirements of the PIS and the future communications requirements of the signal, AFC, and other systems. The advanced design and comprehensive services promote the development of rail transit information technologies, and set a good example for the application of TD-LTE technologies in the rail transit industry.