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Current Status and Trends of MESH Ad Hoc Network Products

1. Introduction to MESH Ad Hoc Network

Mesh wireless ad hoc network is a new generation of mobile broadband multimedia communication system designed with a brand-new “wireless mesh network” concept. All nodes in the Mesh wireless ad hoc network system can realize the real-time interaction of multi-channel voice, data, image and other multimedia information under non-line-of-sight and fast-moving conditions. The advantages of self-organizing network, self-repair, multi-hop cascade, and node self-management can greatly reduce the cost and complexity of network deployment.

Mesh ad hoc networks can be divided into multi-frequency multi-channel networking and single-frequency networking according to the number of networking frequency bands. Among them, the wireless signal transmission and reception of single-frequency networking equipment use a single frequency, and the data transmission bandwidth is limited. Multi-frequency/dual-frequency multi-channel networking equipment uses multiple orthogonal frequencies for different links, which can increase system throughput. Compared with single-frequency networking, multi-frequency networking solves the problem of channel interference for backhaul and access, and greatly improves network performance.

Mesh ad hoc network related technology

In terms of radio frequency technology, in order to improve the transmission rate and performance, in recent years, Mesh ad hoc network equipment has widely used OFDM, MIMO, smart antennas and other technologies.

In terms of communication protocol, it is usually divided into CSMA/CA mode and TDMA mode for data transmission. CSMA/CA (Carrier Sense Multiple Access/Conflict Avoidance) adopts a resource competition mode, but when the number of nodes and hops are large, and the network load is high, the effective utilization of resources is low. The TDMA (Time Division Multiple Access) mode is a scheduling mechanism based on time allocation. When the network load is heavy, the efficiency is higher.

In terms of network routing algorithms, different from the RIP and OSPF routing protocols used in fixed routing, common Mesh wireless routing algorithms include DSDV, DSR, AODV, etc.

Features of Mesh wireless ad hoc network system

2.1. Centerless co-frequency ad hoc network

The Mesh wireless ad hoc network system is a non-centered co-frequency system, with all nodes equal in status, a single frequency point supports TDD two-way communication, simple frequency management, and high spectrum utilization. Any node device can be used as an end node, relay node or command node in the network. At any time and any place, without relying on any other fixed communication network facilities (such as optical fiber, copper cable, etc.), a wireless communication network can be quickly established. All non-centered co-frequency self-organizing network equipment, including outdoor fixed Mesh radio, vehicle/ship/airborne Mesh radio, backpack, handheld portable Mesh individual radio, etc., can be automatically networked by simply turning on the power. Real-time communication between.

2.2. High reliability

The wireless Mesh ad hoc network mobile base station adopts military standard design: it is portable, durable, waterproof and dustproof, suitable for various harsh environments, and quickly deployed to meet the communication needs of emergency scenes. In a traditional WLAN network, if an AP uplink fails, all clients on the AP will not be able to access the WLAN network. Wireless Mesh has the characteristics of self-organization, self-repair, etc. Therefore, AP nodes in the Mesh network usually have multiple available links, which can effectively avoid single points of failure.

2.3. Strong mobility

The location of emergencies is highly uncertain, and the scene of the incident is volatile. Therefore, it is necessary to set up on-site temporary portable base stations according to the circumstances of emergencies. The on-site portable base station is temporary, it is established when the scene appears, and withdrawn when the incident ends.

2.4. Rapid deployment

In the face of emergencies, how to grasp the real-time dynamic information of the incident site in a timely, accurate, fast, and in-depth manner plays a vital role in whether commanders at all levels can make correct judgments and make combat determination. The wireless Mesh self-organizing network high-performance portable base station adopts single-frequency networking, and strives to simplify the on-site configuration and deployment difficulty to the greatest extent, and meet the requirements of front-line combatants for rapid network construction and zero configuration under emergency conditions.

2.5. Non-Line-of-Sight Transmission (NLOS)

NLOS configuration can be easily realized by using Mesh ad hoc network technology, and its automatic relay feature can easily realize trans-horizon transmission. The signal can automatically select the best path and continuously jump from one node to another node, and finally arrive without direct vision. The target node of the distance. The key technology to solve the “last mile” problem in various fields.

2.6. Fast moving with high data bandwidth

The peak data bandwidth of the Mesh wireless ad hoc network system is 28 Mbps. Nodes have non-fixed mobile transmission capabilities, and fast movement does not affect high data bandwidth services. Services such as voice, data, and video will not be affected by rapid changes in the system topology and high-speed movement of terminals.

2.7. Security and confidentiality

The system also has multiple encryption methods such as marshalling encryption (working frequency, carrier bandwidth, communication distance, networking mode, MESHID, etc.), channel encryption and source encryption, etc., dedicated to the private network, which can effectively prevent illegal equipment intrusion and transmission Information is intercepted and cracked to ensure a high degree of network and information security.

Wireless products based on MESH ad hoc network
3.1. Mesh ad hoc network handheld individual radio

3.2. Mesh self-organizing network backpack radio

3.3. Mesh ad hoc network airborne module (for drones)

3.4. Mesh Ad Hoc Network Shipborne/Vehicle Base Station

4. Application of MESH Ad Hoc Network

MESH self-organizing network can meet the emergency communication needs in a variety of complex environments, and has been widely used in police, fire protection, anti-terrorism, disaster relief, civil air defense emergency, three prevention emergency, subway emergency, water conservancy and flood prevention, power inspection, power rescue, Railway emergency rescue, emergency rescue, maritime law enforcement, maritime surveillance inspections, offshore communications, customs border defense, terminal monitoring, forest fire prevention, oilfield anti-theft, military reconnaissance, television broadcasting and other fields. It can be provided in a variety of complex environments such as cities, seas, and mountains. Real-time mobile transmission of high-quality images, voices, and data.

4.1. Forest area wireless monitoring communication

4.2. Urban anti-terrorism and stability maintenance command

4.3. Tunnel communication arrangement

4.4. Fire underground communication

4.5. Marine emergency communications

4.6. Public Security Network Application

5. Advantages of MESH Ad Hoc Network

5.1. Compared with wired transmission, wireless transmission can save the cost of optical fiber and cable, and it is quick and convenient to deploy, easy to maintain, and save construction labor costs;

5.2. There is no unauthorized connection of optical cables; it does not affect the existing lines and reduces the conflict with other line departments;

5.3. Compared with wireless bridges, MESH multi-hop feature can realize long-distance non-line-of-sight transmission.

5.4. Compared with Wi-Fi bridges by increasing the transmission power and adopting directional antennas, LTE MESH can achieve higher receiving sensitivity and adopts omnidirectional antennas for long-distance transmission, which can avoid the complicated installation of directional antennas and the need for technical personnel to guide. , Prone to problems such as skew.

6. The future development trend of MESH ad hoc network

Miniaturization and portability of equipment is one of the future development trends of MESH products. Under the premise of fully considering application scenarios and ensuring necessary functional performance, research on portable and dexterous technology to meet the requirements of single-person and unmanned aerial vehicles.

In the field of emergency communications, Mesh ad hoc network technology is also widely used. The integration of Mesh with other private network communications, satellite communications and other systems is also the focus of future development.

Figure 1. Topological structure of MESH ad hoc network Figure 2. Networking mode of MESH ad hoc network

Post time: 12-23-2021


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