Chapter 4 - Wireless Mesh Networks

Chapter 4 - Wireless Mesh Networks - Wireless Mesh Networks...

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Lawrence Wong 1 Wireless Mesh Networks Chapter 4
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Introduction The term 'wireless mesh networks' describes wireless networks in which each node can communicate directly with one or more peer nodes. The term 'mesh' originally used to suggest that all nodes were connected to all other nodes, but most modern meshes connect only a sub-set of nodes. Complement and improve performance/costs of WPANs, MANETs, WLANs, WMANs Can be seen as an extension of multi-hop ad-hoc networks Each node also behaves as a router, forwarding packets on behalf of other nodes to the intended destinations. Lawrence Wong 2 Wireless Ad hoc Networks Hybrid Wireless Network Multihop Wireless Networks Wireless Mesh Networks Wireless Sensor Networks
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WMNs vs Ad Hoc Networks Ad Hoc Networks Multihop Nodes are wireless, possibly mobile Usually infrastructureless Traffic mainly node-to-node Wireless Mesh Networks Multihop Nodes are wireless, some mobile, some fixed Relies on backbone infrastructure Traffic mainly node-to-gateway Lawrence Wong 3
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WMNs vs Wireless Sensor Networks Wireless Sensor Networks Bandwidth is limited (e.g. 10s to 100s kbps) In most applications, fixed nodes Energy efficiency is an issue Resource constrained Traffic mainly node-to-gateway Wireless Mesh Networks Bandwidth is generous (e.g. > 1Mbps) Some nodes mobile, some nodes fixed Normally not energy limited Resources are not an issue Traffic mainly node-to-gateway Lawrence Wong 4
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WMNs vs Broadband Internet Access Lawrence Wong 5 Cable DSL WMAN (802.16) Cellular (2.5-3G) WMN Bandwidth Very Good Very Good Limited Good Upfront Investments Very High High High Low Total Investments Very High High High Moderate Market Coverage Good Good Good Modest
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WMNs vs WLAN Coverage Lawrence Wong 6 Source: 802.11 WMN Wiring Costs Low High Number of APs As needed Twice as many Cost of APs High Low Bandwidth Good Very Good
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WMNs vs Mobile Internet Access Lawrence Wong 7 Cellular 2.5 – 3G WMN Upfront Investments Low High Geolocation Limited Good Bandwidth Good Limited Upgrade Cost Low High Source: (now ).
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Network Architecture Nodes are comprised of mesh routers and mesh clients. Mesh routers: Conventional wireless AP (Access Point) functions Additional mesh routing functions to support multihop communications Usually multiple wireless interfaces built on either the same or different radio technologies Mesh clients: Can also work as a router for client WMN Usually only one wireless interface Classification of WMN architecture: Intrastructure/Backbone WMNs: Client WMNs Hybrid WMNs Lawrence Wong 8
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Infrastructure/Backbone WMNs Mesh routers form an infrastructure for clients that connect to them Mesh routers form a mesh backbone of self-configuring, self-healing links among themselves With gateway functionality, mesh routers can be connected to the Internet
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