SMUCSE 8344 Wireless Mesh

SMUCSE 8344 The Premise

SMUCSE 8344 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 deployments don't provide ubiquitous access or mobility –Emergence of small-form factor terminals with Minimizes cost of capital, installation and commissioning –Utilizes low-cost 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.

SMUCSE 8344 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

SMUCSE 8344 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

SMUCSE 8344 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)

SMUCSE 8344 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

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

SMUCSE 8344 Mesh Routing Functionality

SMUCSE 8344 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