Design and performance tests in an integrated TD-LTE based train ground communication system

In existing urban rail transit systems, the train ground communication system for different applications are deployed independently. Investing and constructing the communication infrastructures repeatedly not only wastes substantial social resources, it also brings difficulties to maintain all these infrastructures. In this paper, we first present the communication Quality of Service (QoS) requirement for different train ground applications. An integrated TD-LTE based train ground communication system for the urban rail transit system is designed next, which includes all the applications in urban rail transit system. In order to test the integrated TD-LTE based train ground communication system performance, an indoor testing environment is set up. The channel simulator and programmable attenuators are used to simulate the real urban rail transit environment. Extensive test results show that the designed integrated TD-LTE based train ground communication system performance satisfies urban rail transit communication requirement.