business background
The private network wireless communication system is an indispensable and important communication tool for railway communication, public works, power supply, passenger transport, station and other departments. Unimpeded and timely wireless communication is an important guarantee for safe operation and safe operation of trains. Understand the difficulties and demands faced by different departments of railways, tailor communication solutions that apply different scenarios in different sectors, improve the management efficiency and operating safety factors of the industry users, and standardize the operation specifications of the staff.
Railway Power Protection and Train Warning Solution
In order to ensure the timely and effective transportation of rail freight and passengers, the staff of the railway public works, telecommunications, and power supply departments must ensure the normal operation of railroad tracks, turnouts, signals, crossings, etc. In the daily construction protection, there must be a reliable and timely set. The wireless communication system is guaranteed.
Overview
The public works and telecommunications personnel need to maintain, inspect and maintain the railway along the railway all the year round. With the continuous acceleration of the national railway, the speed of the train is accelerating. The train poses a great threat to the safety of the construction workers along the railway. How to deal with the threat that the speed increase of trains brings about the personal safety of construction workers and the need for routine maintenance of the trainees to maintain the normal operation of railways are the problems we need to solve.
At present, the technical means used by railway workers are: When a team needs to go on the road construction. Station guards need to be set up along railway stations, and safety measures should be set at 800 meters before and after the construction site. When the train is approaching, the station protection personnel will use the fixed station to notify the site protection personnel, and the site protection personnel will inform the construction personnel to go down the road.
After investigations at various stations and stations across the road, we found that the following problems still exist:
1. In some areas, the wireless communication between the station and the site is not smooth enough: the on-site protection personnel cannot call the station personnel, or need multiple intermediate liaison officers;
2, the signal is easy to interfere with each other (in the construction of the adjacent two work areas at the same time, the communication is easy to crosstalk each other);
3, can not be difficult to cross regional scheduling communications (for remote sites, remote communication can not be);
4. The maintenance and management of relay stations in the work area is not standardized enough, there is no fault weakening mechanism, and timely communication under emergency conditions cannot be met.
5. There are many tunnels in the interval, and the distance of the call in the tunnel is less than 500 meters. The tunnel cannot communicate with each other inside or outside the tunnel.
6. There is no unified command and dispatch management function in the telecommunications, public works, and work areas, and there is no unified management and unified operation. There is no scientific management norm for wireless intercom.
7. The train warning is not flexible enough, and there are problems such as unclear voice and complicated operation.
Solution description
According to the needs of users, combined with the national policy of analog-to-digital switching, tailored to meet the needs of the protection of contact communication and daily dispatch communication needs to meet the simulation requirements for the railway line along the public works, telecommunications, power supply and vehicle operations along the line In terms of network intercom and digital intercom, based on digital radio communication products, using the railway intranet as a bridge, we use the existing foundations of stations along the line to build a new digital radio communication network. System construction is based on the following principles:
1. Build a digital IP interconnection system with the railway segment as the unit. Each segment determines the number of base stations required by actual electrical measurements according to the scope and terrain under its jurisdiction. It is generally advisable to build a base station with 7-10 km.
2. Each station is equipped with a machine room, an iron tower and a link along the railway line, and the link is an E1 line or an internal IP link complying with the G..703 standard.
3. All networked base station groups are built into an independent sub-network, and terminals are configured in groups to meet the independent communications of the four departments of public works, telecommunications, power supply and vehicles;
4. The road station, section and workshop can be configured with wired dispatching platform to realize remote call, recording and monitoring, and easily implement cross-department calls and unified command and dispatch.
5. The station is equipped with a car station for use by station attendants or station liaison officers.
6, the train equipped with digital car station, intermittent warning information;
After the system is completed, each base station can be grouped separately. During daily work, each business department in each work area is independent of each other. If necessary, cross-site or inter-departmental calls can be made with terminals under other base stations through dialing. Other unrelated personnel are Department responds. The terminal automatically roams across the board, and the locomotive station radio has the function of automatically sending the train running information such as train trips, running speed, position and time, etc., and the intercom and other locomotive radio stations have the function of receiving the train approaching warning information.
Network topology:
The solution adopts IP network technology and PDT digital signalling, effectively solves the problem of large-scale seamless coverage of communication along the railway, and realizes the management of mobile terminals and digital recording and inquiry of all calls. The system can better conduct unified dispatching and command of the electric power service, public works, and power supply sections, quickly perform construction tasks, and maneuver and rationally allocate tasks for each work area. Moreover, in the event of a sudden accident, the section center can dispatch each workshop at any time, guaranteeing the deployment of limited manpower and material resources within the minimum time, and greatly improving the efficiency of the entire hub operation.
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