Emergency Communication Command Vehicle Video Feedback Plan

Background of the Proposal

With the continuous gathering of people, logistics, and information flow, emergency disasters and accidents caused by natural and human factors occur from time to time, causing huge impacts and losses to society. When facing a series of sudden public safety incidents, the use of emergency command communication vehicles can provide guarantees for the efficient implementation of corresponding command and handling work by leveraging their flexibility in movement and quick deployment capabilities. Higher requirements have been put forward for the corresponding emergency communication network, which requires the corresponding communication system to have good stability and flexibility, and to achieve real-time interaction and sharing of information, thereby improving the scientific and timely decision-making of information. The traditional approach involves transmitting communication data back through satellite signals, but satellite signals have poor anti-interference capabilities and are susceptible to interference during rainy and snowy weather. Therefore, this scheme proposes to use LTE 4G wireless communication technology to transform the traditional scheme and comprehensively improve the reliability of the system.

Design Proposal

Solution Overview

The car mounted video conference terminal transmits the collected data back through the use of satellite signals and 4G signals. Satellite signals and 4G signals serve as backups for each other, and by default, satellite signals are used for data propagation and transmission. When encountering harsh weather conditions such as rain and snow, satellite signals weaken. To prevent video data loss, 4G signals are used for transmission back. 4G signal has strong anti-interference ability against harsh environments such as rain, snow, lightning, etc., and the signal is relatively stable.

The solution is to backup satellite signals and 4G signals through a car mounted 4G wireless router. The car video conference terminal is connected to the car's 4G wireless router through a network cable, and the wireless router is then connected to the car's satellite signal transmitter through a wired connection to achieve interoperability of satellite links; The car mounted 4G wireless router can also directly communicate with the command center through the 4G signal of the operator's network, achieving interoperability of 4G links. In the plan, when the vehicle end communicates with the command center through a 4G link, due to the fact that the IP address assigned to the terminal by domestic 4G operators is currently a virtual address, APN or VPN solutions need to be used

Networking method

APN method

The in car video conferencing terminal is connected to the in car 4G wireless router through a network cable; Users only need to purchase the operator's APN service, enter the default username and password into the corresponding input location of the car's 4G wireless router, and establish a virtual tunnel with the operator's designated dedicated line address to achieve virtual intranet communication. Users do not need to do too much configuration, but they need to make regular paid rentals to the operator. This plan has high cost and strong stability, but requires long-term investment to maintain.

VPN method

Connect the car mounted video terminal to the car mounted 4G wireless router; Users need to build a VPN virtual private network and use it to establish a virtual tunnel between the 4G wireless router in the vehicle and the VPN server in the monitoring center, in order to achieve communication with the command center. Compared to APN networking, this solution only requires a one-time payment for long-term use, has lower costs, and is easy to maintain.

Features of the Solution

High flexibility:Wireless coverage has the characteristics of wide distribution range and dispersed geographical location. The use of wired networks lacks flexibility and must consider future development needs as much as possible, which requires a large number of information points with low utilization rates to be pre-set. After the wireless network is built, a 4G car mounted wireless router can be installed at any location within the wireless signal coverage area to achieve network access and high flexibility.
Strong scalability:When it is necessary to increase business points, there is no need for large-scale network transformation. As long as the wireless devices of the monitored points are added or reduced, the increase or decrease of the monitored points can be completed.
Easy installation and construction:The device adopts wireless access method, which avoids or reduces the workload of network cabling, reduces construction costs, is plug and play, and has flexible networking.
Strong adaptability:Provide IP32 protection level, support working temperature of -40~70 ℃, and adapt to various harsh working environments.
高安全性：Supports VPN functions such as GRE, PPTP, L2TP, and IPsec.
High reliability:Adopting dual protection of software watchdog and hardware watchdog, providing multi-level link detection mechanism and automatic fault recovery mechanism, and offering wired and wireless backup.
Easy to maintain:It can support remote automatic software upgrades without the need to replace hardware or manually operate the terminal to add new features.

The core equipment in the plan is the vehicle mounted terminal BT9420

BT9420It is a professional customized high-power LTE terminal device for the transportation industry. The equipment hardware adopts professional shockproof design, 220V AC power supply, and aviation plug interface, ensuring the stability and reliability of the equipment; Adopting advanced LTE technology, it has a high data bandwidth of 100Mbps downstream and 50Mbps upstream.The device integrates the functions of LTE modem, router, and access point into one，While providing network connectivity, it can also realize the establishment of IoT data private networks, remote data access, video collection, emergency communication, and other application scenarios that require large amounts of data and high reliability.

appearance diagram

Product Features

Professional hardware design:AC 220VThe power input and communication interface are designed with aviation plugs and professional seismic and impact resistant structures to meet the harsh working environment of vehicle terminals.

High speed wireless transmission:The product is based on the 4G TD-LTE international standard and supports maximum transmission rates of DL: 150Mbps and UL: 50Mbps. It supports 2 × 2 dual antenna MIMO technology, with downlink MIMO transmission supporting TM1/2/3/4/7/8 mode and uplink transmission supporting single antenna port transmission mode. WiFi supports 2R × 2T with a maximum transmission rate of 300Mbps.

High reliability:Adopting dual protection of software watchdog and hardware watchdog; Provide multi-level link detection mechanism and automatic fault recovery mechanism; Provide primary backup switching based on VRRP.

高安全性：Supports VPN functions such as GRE, PPTP, L2TP, IPsec, etc.

Efficient use:Traffic management technology and intelligent bandwidth allocation technology; One click reset; Equipment configuration free.

Easy to maintain:Support SNMP, TR069 protocol, and customized protocol network management software; It can support remote automatic software upgrades without the need to replace hardware or manually operate the terminal to add new features.