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Wireless Mesh

Wireless Mesh

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Wireless Mesh

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Presentation Transcript

  1. Wireless Mesh CSE 8344

  2. The Premise CSE 8344

  3. 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. CSE 8344

  4. 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 CSE 8344

  5. 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 CSE 8344

  6. 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) CSE 8344

  7. 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 CSE 8344

  8. Challenges (cont’d) • Smart Spectrum Utilization • Analytical Tools • Ease of use (Plug and play, HCI) • Digital Rights Management (DRM) CSE 8344

  9. Mesh Routing Functionality CSE 8344

  10. 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 CSE 8344