Integration of wireless network technology with signaling in the rail transit industry

Communication-Based Train Control (CBTC) is the safe control of urban rail vehicles using data communication as the means of tracking train locations and sending speed and stopping information to trains. First generation CBTC systems used low frequency, low data rate transmission to ensure reliable information exchange. Two trends are driving the next generation of CBTC technology. First is the desire to move away from communication equipment installed between the rails to the use of radios. Second is the desire for interoperability to enable the industry to buy train and trackside equipment from different suppliers and operate that equipment seamlessly. Interoperability and high performance moving blocks are key requirements for the Asia Pacific market, particularly China. The IEEE 802.11 standards offer the benefits sought by the rail transit industry, and enables suppliers of train control systems to focus on train control and signaling while using proven telecommunication equipment. However, some enhancements are needed to current equipment to meet the needs of the urban rail community.