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An experimental performance comparison of 3G and Wi-Fi

An experimental performance comparison of 3G and Wi-Fi. Richard Gass (Intel Labs Pittsburgh) Christophe Diot (Technicolor). Outline. Motivation 3G vs. Wi-Fi Face-off Experiments Results Conclusions. The future of mobile communications. Number of mobile devices is increasing per user

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An experimental performance comparison of 3G and Wi-Fi

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  1. An experimental performance comparison of 3G and Wi-Fi Richard Gass (Intel Labs Pittsburgh) Christophe Diot (Technicolor)

  2. Outline • Motivation • 3G vs. Wi-Fi Face-off Experiments • Results • Conclusions PAM 2010 Zurich

  3. The future of mobile communications • Number of mobile devices is increasing per user • Many useful mobile apps require the use of Internet services • Consumption of data is ever increasing • Users are straining service providers • Service providers are straining users (cost) PAM 2010 Zurich

  4. Satisfying connectivity demands • Dominant technologies • 3G (mobile) • Wi-Fi (stationary) • 3G • Large coverage areas • Seamless connectivity • Current applications work • Data rates are low • ~386Kbits/s-2Mbits/s (3G/HDSPA) • ~3-6Mbits/s (4G/LTE)* PAM 2010 Zurich *http://nextelonline.nextel.com/

  5. Wi-Fi Alternative • Wi-Fi has dense coverage areas in urban areas • Wi-Fi coverage area is small • Wi-Fi doesn’t provide seamless connectivity • Being always connect may not be necessary • Wi-Fi rates are fast • 11 - 54 Mbits/sec (802.11B & G) • 300 Mbits/sec (802.11N) • Potentially zero cost / MB • Open access points • Community networks PAM 2010 Zurich

  6. 3G rates exposed • 3G service is expensive • iPhone AT&T $80 (€59.25) • $30(€22.25)/month • Sprint • $60(€44.50) • Internation rates • $0.0195/KB PAM 2010 Zurich * http://support.sprint.com/support/article/Know_how_data_usage_is_calculated_and_charged_for_Sprint_Mobile_Broadband_plans/case-ye186054-20090916-160215#__highlight&id16=what+can+I+do+with+5+gig

  7. Do this NOW! PAM 2010 Zurich

  8. The question • What is the feasibility of using Wi-Fi as a substitute for 3G Data service • Can Wi-Fi be a substitute for data transfers that do not have delivery deadlines • My mail app checks for mail every 15 mins • What is possible today with existing open AP with default connection parameters PAM 2010 Zurich

  9. Outline • Motivation • 3G vs. Wi-Fi Face-off Experiments • Results • Conclusions PAM 2010 Zurich

  10. Experimental setup • iPhone 3G • Jailbroken • No hardware changes • IBM T30 laptop • Ubuntu (Hardy) • Intel 2915ABG wireless card PAM 2010 Zurich

  11. Experiment location PAM 2010 Zurich

  12. Experiment route • Wi-Fi • Scan • Associate • Request IP • Ping proxy • Download/Upload • Repeat • 3G • Continuous download/upload from proxy PAM 2010 Zurich

  13. Outline • Motivation • 3G vs. Wi-Fi Face-off Experiments • Results • Conclusions PAM 2010 Zurich

  14. 3G vs Wi-Fi downloads while driving <1/3 >60% PAM 2010 Zurich

  15. 3G vs Wi-Fi downloads while walking <1/3 >73% PAM 2010 Zurich

  16. 3G vs Wi-Fi uploads while walking <1/3 >3.2x PAM 2010 Zurich

  17. Conclusion • Opportunistic Wi-Fi performs surprisingly well when compared with 3G • Wi-Fi could provide a substitute for 3G data service • 3G service provider could offload traffic on Wi-Fi. • Imaging if there was provider support! PAM 2010 Zurich

  18. Thanks for listening Questions? PAM 2010 Zurich

  19. BACKUP PAM 2010 Zurich

  20. GSM coverage PAM 2010 Zurich

  21. Wireless Wi-Fi in the US PAM 2010 Zurich

  22. 3G uploads PAM 2010 Zurich

  23. Bay Area, San Francisco PAM 2010 Zurich

  24. Manhatten, New York PAM 2010 Zurich

  25. Bad idea PAM 2010 Zurich

  26. Wigle Stats(www.wigle.net) PAM 2010 Zurich

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