Huawei's dual-network backup GSM-R solution creates a new benchmark for Jinyulu heavy-duty railway safety

As a major infrastructure and public utility industry involving the national economy and the people's livelihood, the state has always attached great importance to the investment and development of railways. Since 2006, China Railway has ushered in a period of rapid development. From Shitai Line to Guangzhou-Shenzhen Port to Beijing-Shanghai High-speed Railway, to this day, the grand blueprint for high-speed railway construction is still going on.

As a key project of railway construction during the “Twelfth Five-Year Plan” period in China, the Jinyulu heavy-duty railway is an important part of the national medium- and long-term railway network planning. The total length of the whole channel is 1,260 kilometers, from Luliang in Shanxi in the west to Rizhao in Shandong in the east. Crossing Shanxi, Henan and Shandong provinces.

Jinyu Lu heavy railroad schematic

The severe challenge of Jinyulu line communication system in complex environment

The Jinyu-Lu Railway, also known as the Jinzhong-South Railway and the Wari Railway, spans the three provinces of Shanxi, Henan and Shandong. It is a large-capacity heavy-duty railway of China's east-west important road network. The line starts from Watang Town, Xing County in the Luliang Mountain area of ​​Shanxi Province, passing through 13 cities in the three provinces of Jinyu and Lu, connecting the main railways of Beijing-Guangzhou and Beijing-Kowloon to the north and south, and east to Shandong Rizhao Port. The main line is 1,260 kilometers long. The standard is the national railway level, traction heavy-duty tons of trains, axle load 30 tons, two-line electrification, annual cargo capacity of 200 million tons. How to achieve safe, reliable and efficient communication under overload and complex environmental conditions, which imposes strict requirements on various systems such as communication systems and signals. In the new situation of railway development, as a GSM-R system carrying train control signals, it is necessary to ensure high reliability and high availability, facing the following three main challenges:

Challenge 1: How to achieve synchronous traction and braking on heavy-duty trains of 2500m and above.

The vehicle-to-ground wireless network carries the train control information related to driving safety. Facing the situation that the heavy weight of the Jinyu Lu heavy-duty railway is heavy and the environment is complicated, once the network is interrupted or the delay occurs, the vehicle signal system will not be able to obtain the ground control center. Safety information, the train will automatically decelerate and even stop, heavy-duty trains are easy to cause derailment, which will cause unpredictable losses to the railway transportation industry in the complex terrain of Shanxi.

Challenge 2: How to solve the synchronous control, scheduling commands, cluster multi-service bearer

In the course of the railway trunk line and heavy-duty railway, the data commands such as synchronous control, scheduling commands, and voice are all carried on a communication network. To ensure that the security service must be processed first, and the service is not blocked.

Challenge 3: Industry Application Adaptation

How to be compatible with existing network services, such as the existing CTC/LOCO TROL/FAS (CTC: Dispatch Centralized System; LOCO TROL: Electric Locomotive Brake System; FAS: Digital Dispatch System) and other series of systems in the platform and communication protocols How to achieve mutual docking. How to respond quickly to demand customization for the application characteristics of the railway industry.

Huawei's highly reliable GSM-R solution calmly faces various challenges

In this project, Huawei relies on the world's leading wireless solution research and development capabilities, dedicated to the research and customization of the Jinyulu Railway GSM-R solution, providing end-to-end access to the communication technology construction and operation of the Jinyulu Railway. The highly reliable GSM-R innovative solution is dedicated to helping the Shanxi Railway Bureau solve the three challenges facing the Jinyulu Railway.

Full network redundant high-reliability communication network to ensure safe and reliable operation of heavy-duty trains

The information carried by the vehicle's wireless network is important information about the safe operation of heavy-duty railways. The accuracy and timeliness of information transmission is the basis for ensuring the safe operation of heavy-duty trains. In the face of heavy-duty trains of more than 2,500m, it is very easy to derail the rails during emergency parking. The reliability and safety of the vehicle-mounted wireless network is particularly important. In this design, the dual-network backup method is designed to improve reliability. . The scheme adopts dual-network load sharing design. The base station of the common site accesses two core networks through different frequency signals, load sharing work, synchronous locomotive control, and controllable tail and tail respectively transmit through double network to ensure single point of failure. Business zero interruption. This dual-core network redundancy scheme and SNCP ring network protection technology are important means to improve the security and reliability of the railway network under the new form of railway informationization.

Multi-service unified bearer and deployment, guaranteed bandwidth and delay for each service

During the marching process of the Jinyu Lu heavy-duty railway, data commands such as synchronous control, dispatching commands and voice are all carried on a communication network. When multiple commands are concurrently executed, how to ensure that the safety services such as locomotive synchronization are prioritized and not interrupted. How to ensure the processing bandwidth of large-flow services has become an important consideration in the design of this solution. Huawei's multi-service QoS guarantee solution applied in this project can effectively solve this problem. The design of this solution mainly has two steps: First, it adapts the scheduling model of Jinyu Lu heavy-duty railway service, and adopts optimized G network. Unified scheduling model, adjustment parameters; Second, according to the Jinyu Lu railway existing network business model, bandwidth allocation on demand, set different resource percentages for different QCI services to ensure smooth business communications. In addition, the bandwidth can be guaranteed by the priority service exclusive policy and the number of terminals accessing the cell. The value of this solution is to ensure the carrying capacity of Jinyu Lu heavy railroad safety business and key services, ensuring the security of operations; at the same time, the bandwidth utilization is improved, avoiding the waste of spectrum resources, and achieving key business priorities and large bandwidth business resources. Balance of utilization.

Multi-service deployment solution

Fusion-adaptive heavy-duty train communication platform and industrial application system

In view of the new situation, how to realize the compatibility and interconnection of the GSM-R network of the Jinyulu Railway with the existing network services, and realize the rapid customization of requirements, Huawei uses an open communication platform to interconnect with different systems. Take LOCO TROL and Huawei GSM-R railway as an example. One method is to interconnect with LOCO TROL through Huawei GSM-R open communication platform, which is mainly reflected in the core network interworking with third-party ground reconnection server through SGW/PG. That is, the message sent by the core gateway of the Huawei GSM-R network is forwarded to the LOCO TROL system through the third-party ground reconnection server to complete the inter-system interconnection; the second method is to connect the LOCO TROL and the column tail to the communication network through DTE. The core network increases the direct control between the master control-slave control and the master control-column tail, and can be forwarded without the ground reconnection server. In order to ensure the network security of the inter-system interconnection, the solution is configured to set up a firewall on the access side to redirect the upstream user packets forwarded by the core network to the firewall to prevent two-way packet attacks between the two terminals.

Reliable wireless networks make China's security a global benchmark

Huawei has laid a solid foundation for the safe and efficient operation of Taiyuan Railway Bureau through a complete and end-to-end high-reliability wireless solution, which has played a supporting role in the development of the regional economic zone. The project has created value for the railway communication technology department and the railway operation unit in railway operation, technological innovation and equipment modernization, and upgraded the railway wireless communication reliability technology to a new height. Huawei's dual-network backup solution designed in this Jinyu Lu Railway has pioneered breakthroughs in wireless communication redundancy technology and complex segment coverage technology, further improving the level of railway communication modernization, and letting China's railway communication technology once again. Walking in the forefront of the world, making China's security a global benchmark.