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Wireless Mesh. The Premise. 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

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Presentation Transcript
the premise
The Premise

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case for wireless mesh
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.

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wireless mesh cont d
Wireless Mesh (Cont’d)
  • Minimizes cost of operations
    • Uses wireless links for backhaul to eliminate costs associated with ongoing leasing of facilities.
    • Auto-configuration, self-organizing and self-healing are intrinsic to the Wireless Mesh Network solution
    • Centralized OAM&P minimizes staffing requirements.
  • Highly flexible in terms of capacity, coverage and availability
    • Increasing capacity, coverage and/or availability simply means deploying more Wireless Access Points.
    • Wireless Access Points maybe deployed indoors or outdoors

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community applications
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

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challenges
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)

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challenges cont d
Challenges (cont’d)
  • Security, Privacy
    • Guard against malicious users (and freeloaders)
    • EAP-TLS between MeshBoxes, PEAPv2 or EAP-TLS between clients and MeshBoxes
    • Priority based admission control
  • Self Management & Self Healing
    • Minimal human intervention - avoid network operator
    • Watchdog mechanism with data cleaning and liar detection

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challenges cont d8
Challenges (cont’d)
  • Smart Spectrum Utilization
  • Analytical Tools
  • Ease of use (Plug and play, HCI)
  • Digital Rights Management (DRM)

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mesh capacity
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

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