Multimedia Command & Dispatch System Based on Positioning and Navigation Information
Overview
In the past, traditional dispatch systems mainly referred to telephone dispatch systems, and both the Ministry of Posts and Telecommunications and the Ministry of Electric Power had their own dispatch switch network access standards. With the widespread adoption of IP telephony, most dispatch systems today have shifted toward softswitch, and can generally interconnect with trunking, shortwave, GSM/CDMA, satellite phones, etc. More advanced systems may also include video linkage content such as video command, video surveillance, and video conferencing, as well as simple map display functions. However, most of them have not fully integrated communication and command resources with location information, nor have they fully leveraged the capabilities of GIS systems and audio/video command and dispatch systems according to certain rules.
In some GIS-based application systems, such as digital city management, public security triple play alarm systems, and 120 emergency medical systems, digital communication means have been largely added. However, since these systems primarily rely on public network communications, although certain technical measures can be adopted to leverage the advantages of various communication resources, they are not professional dispatch systems. They cannot dispatch various public communication resources, cannot promptly know the status of various communication terminals (e.g., whether mobile phones or fixed-line phones are in a call), and cannot provide dispatch functions such as forced release, barge-in, monitoring, broadcasting, and intercom like professional dispatch switches can.
In addition, many audio/video command systems today are simply retrofitted from video conferencing systems. However, video conferencing systems are generally IP-based communication systems that forcibly introduce delay to maintain lip-sync and voice synchronization, whereas command systems sometimes require extremely high real-time performance — whichever of voice or video arrives first is used! For example, in military command, aircraft and missiles are high-speed targets; in some civilian fields such as high-speed railways, subways, civil aviation aircraft, as well as emergency response scenarios such as fire, earthquake, and water conservancy, urgent contact with communication terminals is especially critical.
Therefore, our multimedia command and dispatch system based on positioning and navigation information fully takes into account the advantages and disadvantages of these systems, providing professional multimedia dispatch systems for industries such as digital military camps and smart cities. It fully leverages the technical advantages of both fields to develop newer application technologies. The most prominent features include various information fusion and linkage processing, increased types of event triggers, enhanced emergency plan capabilities, full integration and utilization of location information (including BeiDou, GPS, radar data, ADS (Automatic Dependent Surveillance) data, RFID location data, base station positioning information, etc.), and the generation of navigation data and continuous navigation capabilities.
Multimedia Dispatch System Function Introduction
1) Digital Time-division Switching and Ethernet Switching
Advanced digital time-division switching technology is adopted, featuring a 4096×4096 fully digital switching network. It also supports 100/1000M Ethernet switching. Since it supports both circuit switching and IP switching simultaneously, it lays a solid foundation for the system to support various circuit services, IP services, and gateway services.
2) User Permissions
Each user can be individually configured with attributes such as restricted incoming calls, restricted outgoing calls, restricted outbound access, restricted dialed numbers, and restricted calls outside the user group.
3) System Cascading
The capacity of sub-systems is fully sufficient for the communication needs of most station sites. For stations with larger capacity, a main system can be adopted, while for very large stations, multiple systems can be cascaded to meet high-capacity station communication requirements. The cascaded systems are not affected in any way in terms of services, functions, or their maintenance and management.
4) Compatibility with Existing Dispatch System Functions
The system is compatible with existing digital dispatch system functions and original analog dispatch system functions. The system also provides various analog interfaces for direct connection of analog dispatch consoles, analog dispatch extensions, analog dispatch trunk lines, and other analog devices.
5) Emergency Telephone
When a telephone set as an emergency telephone (priority user) calls the dispatch console or a sub-system duty console, the call path is connected without requiring an answer from the dispatch console or sub-system duty console, and the emergency telephone can directly communicate with the dispatch console or sub-system duty console.
6) Emergency Call
When the dispatch console (sub-system duty console) initiates an emergency call, the dispatcher presses the emergency call key first and then the corresponding key to raise the priority level of the call. At this point, barge-in and forced release can be implemented for lower-priority calls.
7) Centralized Management and Remote Maintenance
The system allows a network management terminal to be set up at the main system, connected to the system backend via an RS232 serial port, enabling centralized management and remote maintenance of the main system and all sub-systems along the entire line. The network management sub-system is powerful, covering four major functions: performance management, fault management, configuration management, and security management. Detailed descriptions are provided in the network management sub-system introduction.
8) Recording Function
The system can provide a recording server. By configuring a recording server with a large-capacity disk array, array-based storage is adopted. Users can access the recording system using their user passwords and can play, search, and transfer voice data according to their user permissions.
9) Conference Function
The system is equipped with abundant multi-party conference circuits for dispatchers and duty officers to organize multi-party conferences.
Functional Features
Ø The multimedia command and dispatch system based on positioning and navigation information, in addition to implementing traditional video and voice dispatch functions, also implements positioning and navigation functions for various dispatch terminals, enabling real-time awareness of the geographic location, movement trajectories, and other information of each dispatch terminal on the GIS platform;
Ø Supports switching and dispatch functions for fixed-line telephones and IP telephones;
Ø Fully supports wireless analog and digital trunking system dispatch. It can support dispatch of TETRA, GOTA, MPT1327, and other wireless trunking communication systems;
Ø Supports 3G/4G WiFi and WiMax wireless trunking communication methods;
Ø Supports explosion-proof wireless communication terminals used in mining and oilfield applications, including WiFi handsets, PHS phones, and wireless trunking terminals;
Ø Video dispatch functions: supports video alarms, linkage of video images with alarm calls, video conferencing, video recording and playback. All video terminals support voice intercom and on-site voice monitoring;
Ø Supports video terminals with 3G network transmission, facilitating video collection and surveillance in mobile environments or environments where IP lines cannot be deployed.
System Schematic Diagram
