Wireless Mesh Network

1 Introduction A network topology can be defined in a variety of ways, as there are different types of networks, depending on a specific number of users, functions, and purposes. For example, at the Multimedia University (MMU), all networks on the campus are connected via a local area network (LAN) and access MMLS. When connected to the outside via the Internet, it is called a wide area network (WAN). Connect to the world through a variety of network topologies, including point-to-point, bus, star, ring, grid, tree, blend, and finally daisy chains.

In outdoor wireless networks, the wireless mesh network is the third topology followed by point-to-point and point-to-multipoint for building a wireless network infrastructure. Each device in the wireless mesh network is often referred to as a mesh node and is connected to a plurality of other mesh nodes at the same time. Since each mesh node reaches other nodes via multiple hops and other nodes can be used as repeaters, the wireless mesh network is also a multihop network. The main advantage of a wireless mesh network is that the mesh network can reroute traffic over multiple paths to cope with link failures, interference, power failure, or network equipment failures, resulting in inherent redundancy or reliability It is in.

A structured wireless mesh network is usually a planned network that is implemented using multiple radios and multiple directional antennas at each node location. Ring topologies that use multiple directional radio links are typically used in structured wireless mesh networks to allow each radio to seamlessly transfer traffic on different paths in the event of node or link failure I will. These provide an ideal network architecture for ensuring that sites do not require reliable and available wireless networks for broadband applications such as video, voice, data streaming. Since each link of a structured wireless mesh network runs on a separate channel, the number of hops for a particular transmission does not affect the total throughput of the network.

In an unstructured wireless mesh network, each mesh node usually uses an omnidirectional antenna and can communicate with all other mesh nodes within the transmission range. Unplanned wireless links in unstructured wireless mesh networks do not always guarantee the availability of links. Depending on the density of the mesh network, there may be many links available to other mesh nodes, or not at all. Unstructured mesh networks are typically implemented using non-line of sight radios (NLOS) using low and low bandwidth wireless operations such as in the UHF band such as unlicensed band at 400 MHz or 900 MHz .