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CIS 6930: Workshop Research Introduction and Lab Assignments

CIS 6930: Workshop Research Introduction and Lab Assignments. Wireless Measurements: Shao-Cheng Wang ( shaochew@ufl.edu ) Trace Analysis: Wei-jen Hsu ( wjhsu@ufl.edu ) Encounter-based Networks: Sapon Tanachaiwiwat ( stanachai@gmail.com )

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CIS 6930: Workshop Research Introduction and Lab Assignments

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  1. CIS 6930: Workshop Research Introduction and Lab Assignments Wireless Measurements: Shao-Cheng Wang ( shaochew@ufl.edu ) Trace Analysis: Wei-jen Hsu ( wjhsu@ufl.edu ) Encounter-based Networks: Sapon Tanachaiwiwat ( stanachai@gmail.com ) Gradient-based routing in Wireless Sensor Networks: Jabed Faruque ( faruque@usc.edu ) Instructor: Dr. Helmy 2/5/2007

  2. CIS 6930: Workshop IWireless Measurements Presenter: Shao-Cheng Wang shaochew@ufl.edu Instructor: Dr. Helmy 2/5/2007

  3. Agenda • Introduction • Wireless measurement fundamentals • Tools • Assignment questions • Reference

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

  5. coverage maps (cont’d)

  6. Wireless fundamentals: SNR v.s. Distance

  7. 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)

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

  9. Tools (cont’d) • HP iPAQ

  10. Tools (cont’d) • Bandwidth test • NDT @ UF: http://ndt.server.ufl.edu:7123/ • TCP uplink/dnlink speed • Myspeed: http://myvoipspeed.visualware.com/ • UDP loss rate, jitter

  11. Lab Assignment • 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 • Locate APs in some specific areas/buildings • Create an AP-specific coverage map • Observations and discussions about the AP planning (evaluation of planning, tradeoffs, applications, etc.)

  12. Lab Assignment (cont’d) • Bonus questions • Other types of maps? (e.g. war-driving) • Other points of interest (e.g. downtown Gville, oaks mall)? (http://www.digitaldowntown.net/) • How to improve visualization? (http://www.sketchup.com) • How to automate the measurement procedure? (e.g. using campus bus to survey wider areas?) • Logistics • Lab #1 starts this week, due 2/26 (3 weeks from today) • Come up your plan soon, feel free to discuss with me and other a-group members (email, appointments..) • Come to CSE401 to check out equipments if you want • iPAQ 2400 (with Wi-fi, bluetooth built-in) • iPAQ 3900 (with gps, bluetooth built-in) *checkout by “per group”, send email for appointment before you come, bring your id. *no overnight loan. everything should be returned by 6pm

  13. 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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