15-02-2013, 09:20 AM
WIRELESS MESH NETWORKS --A high performance networking system
WIRELESS MESH NETWORKS.ppt (Size: 920.5 KB / Downloads: 21)
INTRODUTION
Wireless mesh networks (WMNs) are dynamic networks in which the node automatically establishes an ad-hoc network and maintains the mesh connectivity. WMNs are self-organized and self-configured networks
which comprised of two types of nodes, namely mesh routers and mesh clients. In addition to the existing routing capabilities,
the mesh router contains additional routing functions to support mesh networking. Through multi-hop communications, the same coverage can be achieved by a mesh router with much lower transmission power
Network Architecture
The architecture of WMNs can be classified into three types
1. Infrastructure / Backbone WMNs
2. Client WMNs.
3. Hybrid WMNs.
Infrastructure / Backbone WMNs
The mesh routers form a mesh of self - configuring, self -healing links among themselves. With gateway functionality, mesh routers can be connected to the Internet.
Conventional clients with an Ethernet interface can be connected to mesh routers via Ethernet .links. For conventional clients with the same radio technologies, as mesh routers,
Client WMNs
In this type of architecture , client nodes constitute the actual network to perform routing and configuration functionalities as well as providing end – user applications to customers.
Hybrid WMNs
Mesh clients can access the network through mesh routers as well as directly meshing with other mesh clients.
While the infrastructure provides connectivity to other networks, such as the Internet,
cellular and other sensor networks, the routing capabilities of clients provide improved connectivity and coverage inside WMNs
Conclusion
Although WMNs can be built up based on existing technologies, field trials and experiments with the existing WMNs prove that the performance of WMNs is still far below expectations
we believe that WMNs will be one of the most promising technologies for next – generation wireless networking.