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CEN6930: Wireless Experiments Background

CEN6930: Wireless Experiments Background. Wireless Measurements: Shao-Cheng Wang ( shaochew@ufl.edu ) Instructor: Dr. Helmy. Part I: Wireless Measurements Agenda. Introduction Wireless measurement fundamentals Tools/Procedures Reference. http://www.ittc.ku.edu/wlan/images.shtml.

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CEN6930: Wireless Experiments Background

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  1. CEN6930: Wireless Experiments Background Wireless Measurements: Shao-Cheng Wang ( shaochew@ufl.edu ) Instructor: Dr. Helmy

  2. Part I: Wireless MeasurementsAgenda • Introduction • Wireless measurement fundamentals • Tools/Procedures • Reference

  3. http://www.ittc.ku.edu/wlan/images.shtml How does a coverage map look like?

  4. coverage maps (cont’d)

  5. Wireless fundamentals: SNR v.s. Distance

  6. Wireless fundamentals: SNR v.s. Performance SNR v.s. Delivery ratio (emulator) SNR v.s. Delivery ratio (real measurement) SNR v.s. TCP Tput (real measurement)

  7. Tools (cont’d) • HP iPAQ: WiFiFoFum

  8. Tools • Site-surveyer: Netstumbler (www.netstumbler.com) • Signal (in –dbm), SNR • AP MAC, SSID

  9. Wireless coverage experiments Indoor measurements Outdoor measurements

  10. Indoor measurements

  11. Outdoor measurements

  12. Logistics • Exp: starts this week (?) • Form groups: 4~5 ppl • Equipment checkout: CSE401 • Bring your ID • 11am~6pm, no overnight checkout • Preparations • Materials • link: http://www.cise.ufl.edu/~sw0/cen6930/ • Software • Wififofum: pocket pc wifi scanner http://www.aspecto-software.com/rw/applications/wififofum/ • Knsgem: convert wifi scanner output to google earth kml • Google earth

  13. Potential experiment topics • Coverage Map: • Create a coverage map of your choice: • SNR (enhanced with levels, dbm #’s) • SNR variations (weather, day/night) • Performance map • Find holes, additions, tech heterogeneity (11a/b/g/e/n) etc. (please coordinate between groups for the area of interest) • Reason about your choice and the implications of practicability • Observations/Surprises? • AP Hunting/Coverage/Handover • Locate APs in some specific areas/buildings • Create an AP-specific coverage map • AP-coverage/handover map for routes on campus • Observations and discussions about the AP planning (evaluation of planning, tradeoffs, applications, etc.)

  14. Reference • Simon Byers and Dave Kormann, “802.11b access point mapping,” Communications of the ACM, May 2003. • Daniel Aguayo, John Bicket, Sanjit Biswas, Glenn Judd, Robert Morris, “Link-level Measurements from an 802.11b Mesh Network,” SIGCOMM 2004, August 2004 • Hiroto Aidal, Yosuke Tamura2, Yoshito Tobe2, Hideyuki Tokudal, “Wireless Packet Scheduling with Signal-to-Noise Ratio Monitoring,” LCN 2000

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