1.8GHz-based TD-LTE (Time Division Long Term Evolution) system used for subway rail communication

Abstract

The invention discloses a 1.8GHz-based TD-LTE (Time Division Long Term Evolution) system used for subway rail communication, relating to the field of subway rail communication. The TD-LTE system comprises an EPC (Evolved Packet Core), vehicle-mounted terminal equipment and a plurality of LTE base stations, wherein the TD-LTE system works in a 1.8GHz frequency band; the EPC is connected to a CBTC (Communication Based Train Control) system on the ground; the LTE base stations are distributed along a subway rail line and are connected to the EPC through optical fibers after passing through switches; the vehicle-mounted terminal equipment comprises front LTE CPE (Customer Premise Equipment) and rear LTE CPE, wherein the front LTE CPE and the rear LTE CPE are both connected to the vehicle-mounted CBTC system and are connected to the LTE base stations through a wireless network. The TD-LTE system utilizes the special 1.8GHz frequency band, so that a problem of radio interference is avoided from the source, the driving operation safety is guaranteed to the greatest extent, and meanwhile, the future rail transit development trend and the long-term benefit of the operating unit are both considered.

Description

technical field [0001] The invention relates to the field of subway rail communication, in particular to a 1.8GHz-based TD-LTE system for subway rail communication. Background technique [0002] Urban rail transit has the characteristics of high speed, high density, and uninterrupted operation, so the signal system that controls the operation of rail transit plays a vital role in ensuring the safe operation of rail transit and improving the passing capacity of rail transit. At present, most of the signaling systems of newly-built subway lines in my country use the CBTC (Communication Based Train Control, communication-based train control) system. The CBTC system enables the train to upload its position, report and receive ground information in real time through the exchange of a large amount of data between the train and the ground. Control information such as mobile authorization to realize train movement block or virtual block control. [0003] The CBTC system has the foll...

AI Technical Summary

Problems solved by technology

Due to the large concentration of various applications and users, wireless interference is common

[0010] In November 2012, several trains on the Shekou Line and Central Line of the Shenzhen Metro suffered sudden emergency stop accidents during operation, causing the system to fail to operate normally and a large number of passengers stranded

The results of the investigation are: the wifi routers carried by passengers interfered with the train-ground wireless network of the data communication system, resulting in the failure of the data communication system to complete normal information transmission, resulting in an emergency train stop accident

Afterwards, after multiple investigations, it was found that all CBTC systems using 2.4GHz fixed channels have this potential safety hazard. The problem of wireless interference has become a bottleneck affecting the safe operation of rail transit, restricting the development of rail transit signaling systems

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