Fleet interconnection MESH ad hoc network intelligent broadband communication system

overview

When the large fleet is carried out in some remote areas, such as mountainous areas, forests, and closed tunnels, the traditional means of communication (such as public network, private network, cluster communication, etc.) can not complete limited coverage, and the communication smoothness of the large fleet in such areas is effectively guaranteed, resulting in the commander can not deal with emergencies and potential risks in a timely manner and effectively prevent them, and the decision-making is a lack of comprehensive perception of the situation, and the command order is difficult to be effectively issued.

solution

The goal of the program is to realize real-time wireless audio, video, and data multi-hop transmission between the team team and the command vehicle, and ensure the smooth communication of large fleets in such areas.

2. Dynamic networking during the march, random entry/exit;

3. Two-way data transmission such as audio and video, voice intercom, etc

4. Small business application delay and quick response;

5. Network security and data confidentiality

At this time, the vehicle-mounted ad hoc network equipment of Wanlan Communication can be set up on each motor vehicle to quickly set up a regional broadband wireless multi-hop network, which can realize interaction and information sharing between nodes, and effectively realize the forward movement of the command center and on-site command and dispatch. It is especially suitable for a variety of application scenarios such as fleet emergency response, anti-terrorism and explosion prevention, emergency rescue and disaster relief, large-scale event support, temporary deployment control and relay transmission.

Now it is necessary to install MESH equipment for each group of vehicles in the fleet, so that the fleet can form a multi-hop broadband communication link, solve the problem of communication interruption that may occur in the process of the entire fleet, and provide it for the commanderReal-time vehicle conditions, audio and video and other comprehensive intelligence information.

The scheme design is as follows:

Network topology diagram analysis: A total of 6 vehicle teams perform field tasks. One of them is a command vehicle. The other 5 vehicles were located within 1-3 km of the front and rear of the command vehicle. All six fleet nodes use AnyMesh-SDR-A5 (on-board radio) to realize wireless audio, video, and data multi-hop transmission between all vehicle teams and command vehicles. One of the command vehicles is equipped with a dynamic communication, which can also be transmitted back to the monitoring center by means of a satellite by calling up any video of the convoy.

The solution is as follows:

1. The deployment of ad hoc network vehicle nodes on the vehicles of the fleet can set up a multi-hop relay and high-mobility broadband wireless ad hoc network in a very short time without preset planning, ensuring multi-vehicle linkage communication, and providing independent, safe, efficient and timely voice communication, data transmission and video surveillance services

2. Support the dynamic networking of the team in the process, and will not affect the wireless communication of the entire fleet when the formation is constantly changing. At the same time, the command vehicle node can communicate wirelessly with any other vehicle node in the fleet, and can transmit the video image collected by itself and other vehicles back to the remote command center through the vehicle-mounted satellite communication system

3. It has great anti-multipath interference ability, adapts to the complex and changeable geographical environment of the fleet, and ensures reliable transmission and communication in fast-moving and non-visible obstacle occlusion scenarios through diffraction reflection multipath transmission.

System features:

Ideal for joint fleet networking systems

For vehicle communication, both static and dynamic communication have been matured, but for the dynamic networking between vehicles, there has been a lack of an appropriate and cost-effective means. ANYMESH's wireless smart broadband network equipment is exactly what it takes.

System feature 1: centerless fast networking

After the vehicle node is turned on, it will quickly search and discover nearby vehicle nodes, and automatically build a network without the need for network planning and configuration in advance. When other vehicles or fleets join the original fleet, the new vehicle nodes will be combined with the original network to form a larger network through direct connection or jumping, so that the coverage of the entire fleet does not depend on the central command vehicle.

System feature 2: Reliable network transmission

At the beginning of the design, the system takes into account the interference and occlusion problems in the wireless transmission process, adopts COFDM modulation technology, and the frequency can be flexibly configured, with the help of the transmission advantages of different frequencies, so that the equipment can still ensure normal communication work and data services in the face of multiple, complex and flexible environments.

In actual use, if a vehicle node is interrupted due to a malicious external strike, the network will select a new link to continue to transmit data to ensure the normal operation of the service.

System feature 3: Automatic link load balancing, strong compatibility

In this case, the wireless intelligent broadband network will select another transmission link according to factors such as the transmission environment and data size, and transfer a part of the data of the service to the new link for transmission.

The system network equipment conforms to standard network protocols, has rich interfaces, and can be connected to third-party transmission networks, such as optical fiber networks, wired networks, 4G networks and satellite networks.

System feature four: voice intercom

In this case, in addition to audio and video surveillance, it is also necessary to maintain voice communication between vehicle points to ensure that the task is in step and play the role of command and dispatch.

A centerless IP voice module is integrated into the wireless intelligent broadband network equipment to realize voice communication between vehicles. Compared with other intercom solutions, the voice intercom function is more suitable for the centerless network architecture, and any failure will not affect the voice communication between other nodes, and the transmission range is not limited by the wireless performance of a single node.

System feature 5: security and encryption

In this case, the customer has extremely high requirements and sensitivities for network security and data encryption, and it is precisely because of the particularity of the use environment and the project involved that the ANYMESH ad hoc network equipment takes the security of network and data as the core topic of the top priority. To this end, the following strategies and means are mainly provided:

• A network node is tied to a unique MAC address of a hardware device

• Network identifier to distinguish the legitimacy of nodes in the local area network;

• AES128 or AES256 encryption technology is used to make the entire network secure and reliable.

In addition, it provides an interface to a security machine or encryption module, and the protection level is increased by third-party equipment before the data is connected to the network.

Equipment introduction

Ad hoc network vehicle station (1U rack type).

The specifications are as follows:

Summary of the program

ANYMESH's wireless intelligent broadband network equipment designed for joint fleet travel adopts the self-developed MESH networking protocol, which does not need to be set up and planned in advance, and does not need to set up a network center point. It supports high-speed moving, multi-hop, and high-bandwidth wireless transmission networks. The equipment adopts COFDM modulation and demodulation technology, which has strong anti-multipath interference ability, which can be greatly adapted to the complex and frequent wireless transmission environment, and can be customized at the same timeIt also provides support for customers in different fields, scenarios, and different needs to build independent, secure, flexible, and convenient high-speed networks.

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