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Wireless LAN Research Laboratory

Wireless LAN Research Laboratory. Performance Monitoring And Deployment Tools Presented by: Prof. K. Pahlavan Project Staff: A.Zahedi, P.Krishnamurthy, A.Falsafi, M.H. Ali, S. Bagchi, M.Dembele, J.Robinson, A.Messier. Wireless LAN Research Laboratory. Starting Date: January 1996.

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Wireless LAN Research Laboratory

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  1. Wireless LAN Research Laboratory Performance Monitoring And Deployment Tools Presented by: Prof. K. Pahlavan Project Staff: A.Zahedi, P.Krishnamurthy, A.Falsafi, M.H. Ali, S. Bagchi, M.Dembele, J.Robinson, A.Messier

  2. Wireless LAN Research Laboratory Starting Date: January 1996 Current Members

  3. WLRL PROJECTS in 1996 • Development of Testbed and Benchmarks • Deployment tools

  4. Why Testbed • For comparitive performance evaluations of variety of technologies • Analytical Models and Simulations do not provide realistic results • Advantages of a Testbed • reflects the real environment • can use multivendor environment for interoperability study • can be configured in different ways

  5. General Specification of NSF/WPI Testbed • Accomodates different Software Platforms • Multivendor Support (bridges, routers, access points,...) • Isolated traffic subnet but Access to All Services • Modularity • Network Manager Capability (Monitoring and Control)

  6. Current Specifications of the NSF/WPI Testbed • Acess Points: DEC RoamAbout • Router: Cisco 4500 • Bridges: Persoft, Solectek, Aironet, Wilan • Network Manager HP OpenView • PCMCIA Wireless LAN cards DEC RoamAbout FHSS/DSSS

  7. Electronic Whiteboard Ethernet line to ATM access switch Wireless Classroom Wireless access point Laptop with PCMCIA card PPWB Point-to-point wireless bridge Wireless access point PPWB Atwater Kent Labs Wireless Classroom PPWB Portable protocol analyzer ATM Access Switch Fuller Labs Olin Hall Network monitoring and management tool Gordon Library PPWB Campus backbone PPWB Salisbury Labs Wireless LAN Figure 1: Wireless Campus Testbed - Network Architecture

  8. Available Benchmarks:General Purpose • Ziff-Davis Benchmark Operation (Netbench) • Novell based throughput measurement • HP Netperf • Request/response (latency) tests for TCP and UDP with API • US Army Ballastic Research Lab TTCP • Transport layer throughput measurement

  9. Available Benchmarks:Special Purpose • CWINS Proprietary Benchmarker suitable for: • Interoperability test • TCP/IP oriented • Easy to use Graphical User Interface • Accomodate multiple platform (Unix workstations, PCs, Windows)

  10. CWINS Wireless Benchmark

  11. CDPD Configuration

  12. Tools for Deployment ofWireless LANs

  13. Software Tool (CWINS)

  14. Propagation Models • Accurate Site Specific Models • Ray Tracing • FDTD • Fast statistical models: • JTC Recommendation • Wall dependent • Direction of Research • Fast Ray Tracing algorithms • Hybrid models

  15. Algorithms for Optimal Deployment • Direct search (simplex) method (AT&T/CWINS) • Simple for programming • Fast convergence • Simulated annealing method (EDX) • Complicated for programming • Slow convergence • Neural Network Method (U. of Maryland) • Convergence is not gauranteed

  16. E.g. of Software Implementation

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