Customer Requirements

Featuring fast speed, safety, punctuality, large capacity, low energy consumption, environmental friendliness and land conservation, urban rail transit is a top-ranked urban public traffic system worldwide. It generally consists of rail lines, stations, trains, maintenance bases, power supplies and substations, communication signals, and command centers. It raises the following requirements for wireless multimedia communications:

Wireless trunking-based dispatch

• Train dispatch
• Environmental control (disaster prevention) dispatch
• Maintenance dispatch
• Train depot duty

Train-to-ground wireless communication

• Query and publication of train-related information
• Video surveillance, security protection and antiterrorism
• Emergency disaster relief and multi-department coordinated command and dispatch
• Playback of public service advertisements
• Weather forecast
• Announcement of news and traffic information

Solution Description

GoTa 4G provides the professional wireless trunking dispatch function for meeting the requirement of train-to-ground wireless communications. The GoTa 4G core network equipment is deployed in a central equipment room or a control center. Wireless base stations are deployed in communications rooms or tunnels. Wireless train access units (TAUs) are deployed inside trains and connected with train-mounted subsystems through cables. The antenna of a TAU is mounted outside the compartment top. Staff are equipped with smartphones for services such as voice calls, visual trunking intercom, data transmission, images and HD videos transmission.

Solution Highlights

Professional trunking

• Multi-party response and quick access (within 300 ms)
• Professional dispatch console, with abundant secondary development interfaces, supporting customization to the industry
• Wireless broadband
• Data rate up to 100 Mbit/s due to the use of LTE technologies, supporting HD video transmission
• Signaling delay of shorter than 100 ms, guaranteeing reliable transmission and security of signals

Communications quality

• Dedicated voice channel, featuring strong anti-interference capability, high volume and high definition
• Capability of delivering an experience comparable to stationary communication at moving speed of more than 350 km/h, guaranteeing the communication performance during high-speed movement

Standard evolution

• ITU standard-compliant evolution and proprietary products tailored to rail transit
• Globally commercialized equipment, meeting the interconnection and interworking requirements