25-09-2013, 02:52 PM
Wireless Mesh Network
Wireless Mesh Network.ppt (Size: 578 KB / Downloads: 28)
Case for Wireless Mesh
High-speed wireless packet data access across a wider coverage area
Cellular systems don't provide the bandwidth available in WLANs.
Isolated hotspot 802.11 deployments don't provide ubiquitous access or mobility
Emergence of small-form factor terminals with 802.11
Minimizes cost of capital, installation and commissioning
Utilizes low-cost 802.11 technology.
Uses wireless links for backhaul to eliminate costs associates with installation of wired interconnect.
Auto-configuration algorithms in Wireless Access Point eliminate costs associated with engineering and organization of the wireless backhaul network.
Community Applications
Shared Broadband Internet Access
Ubiquitous Access (roaming solved: one “true” network)
Neighborhood Gaming
Medical & emergency response
Neighborhood watchdog (e.g. video surveillance)
Shared Community Resource
Media repository
Distributed backup
Challenges
Range and Capacity
Inexpensive electronically targettable directional antenna or MIMO for range enhancement
Multiple frequency meshes
Multi-radio hardware for capacity enhancement via greater spectrum utilization
New data channel MAC with Interference management or higher throughput
Multi-hop Routing
L2.5 on-demand source routing with link quality based routes selection
Route selection with multiple radios (multiple channels)
Mesh Capacity
Connectivity Graph
Models node connectivity
Incorporates capacity of each link
Conflict Graph
Captures interference among links
Tool
Solves MAXFLOW problem on the connectivity graph with constraints drawn from the conflict graph
“What-if” Analysis
Scenario based numbers instead of asymptotic bounds
Allows evaluation of different wireless technologies