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World’s First LTE Train-Ground Network

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World’s First LTE Train-Ground Network

2013/8/6 15:49:00


Zhengzhou is a major city and transportation hub in central China. The municipal government decided to speed up the development of the urban railway system to improve highway traffic conditions and support sustainable development. The government expected the metro to take 60% of the public transportation load in the city’s central business district.


Train-ground wireless transmission is a common bottleneck for urban railways. Zhengzhou officials faced several challenges in determining an appropriate wireless communications system:

Slow, unstable data transmission in the Passenger Information System (PIS)

Traditional PIS systems use local data recording or a WLAN for real-time data transmission. The data recording solution does not support real-time information services making real time information sharing between train and ground difficult. WLANs have low bandwidth and stability that result in frame freezing, transmission interruption, and a poor user experience.

Vehicle-mounted devices cannot upload live video

Due to low uplink data transmission capacity, train-mounted communication devices cannot efficiently upload live video surveillance data to the operations center so public security protection suffers.

High fault rate and difficult maintenance

WLANs use Access Points (APs) to provide communications services. A single AP covers a maximum of 220 yards. (200 meters) and is often unreliable. To improve coverage, companies must sometimes deploy a large number of devices with power supply units, to correct high fault rates and reduce O&M costs.


Huawei provided an all-in-one network LTE wireless communications solution to provide data transmission services for the PIS and train-mounted video surveillance system.

Huawei planned the network to leverage LTE’s advantages in access performance and service bandwidth. This solution provides approximately 20 Mbit/s downlink bandwidth.

The Huawei system works in Time-Division Duplex (TDD) mode enabling it to provide high-bandwidth uplink data transmission using limited frequencies for live HD surveillance videos.

The system incorporates a comprehensive Quality of Service (QoS) mechanism to refine service priority management. When the network is not congested, the system experiences little delay, minimized packet loss, and high QoS. When the network is congested, it makes sure key services get the required bandwidth. The network carries the service data for the PIS and video surveillance system, lowering network development costs and laying a solid foundation for the future.

The Mean-Time-Between-Failure (MTBF) of LTE Remote Radio Units (RRU) is at least 150,000 hours, much higher than WLAN APs at 50,000 hours. Huawei’s industry-leading 20W single-channel transmission power and first-class switching performance allows each RRU to cover 1,300 yards. (1,200 meters). That dramatically decreases the number of power supply units needed and significantly reduces deployment costs, additionally simplifying O&M.


The solution ensures stable and efficient operation of the PIS, bringing several key benefits:

Better rail system brand image

The project provides a high-speed, stable, and reliable train-ground wireless data transmission network. Riders feel safer, get additional passenger amenities, and are generally happier with their service.

Better service quality

Traditional WLAN train-ground wireless systems suffer frequent signal interruption and blurry video. Huawei’s network solves the problem with uninterrupted data transmission channels. Trains gather information and communicate the data between stations and operating centers continuously. 

Enhancing security protection and emergency response

The system gathers live video surveillance and data directly from the train cars. Emergency management personnel can obtain real-time information for better security and emergency response.

Improved O&M and cost-effectiveness

Traditional WLAN solutions suffer high failure rates, require massive device deployment, and make O&M difficult. Huawei’s highly reliable and secure design improves O&M more than tenfold.

LTE stability has been tested in global markets and is the future of mobile communications technology. It is fast becoming the mainstream for 3G to 4G evolution. Jump on board.

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