A wireless network that relies on all the nodes in the network to propagate signals. Although the wireless signal starts out at some base station (access point) attached to the wired network, a wireless mesh network extends the transmission distance by relaying the signal from one active device to another. Although this type of network has been used on the battlefield for path diversity for years, it is used today for sensor networks and can be used for personal computers. See mobile ad hoc network and wireless LAN.Whereas the Internet is mostly a wire-based, co-operative electronic communication infrastructure similar to the international postal agreement, in that messages are mutually delivered and relayed within their separate domains free of charge (i.e. if you relay my messages within your domain I'll relay yours within mine), Mesh is a wireless co-operative communication infrastructure between a massive amount of individual wireless transceivers (i.e. a wireless mesh) that have Ethernet type capabilities.
Note: All above contents & figures are taken from [2]
Following figure clearly shows overall picture of mesh network, how it is connected to internet and how it connects to mesh clients.
Figure: Hybrid Mesh Network [1]
Wireless Mesh backbone: This is the upper large ellipse in the figure. It connects internet (on upperside in fig.) and client meshes on other sides. It consists of wireless mess routers and mesh routers with gateways/bridges.
Wireless Mesh Clients: Mobile ad hoc network (MANET) consisting of Wi-Fi, Wi-Max, Sensor Network, Cellular Network, as well as Conventional Clients as shown in figure.
Reference:
[1] Ian F. Akyildiz, “A survey on wireless Mesh Networks,” IEEE Radio Communication, Sept. 2005, pp. xxx-xxx.
[2] http://www.answers.com/main/ntquery?s=wireless+mesh+network&gwp=13
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