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VoIP over Wi-Fi Networks: Performance Analysis and Acceleration Algorithms

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Abstract

The expected VoIP call capacity in a one hop IEEE 802.11b network with G.711 voice codec is about 85 simultaneous calls, but the actual observed capacity is only 5 calls even at the highest data rate and under zero loss conditions. In this paper we analyze the reasons behind this inferior performance of VoIP traffic. We also present algorithms at the medium access control layer to improve the observed call capacity. Using ns-2 based simulations, we evaluate the algorithms and show that performance improvements of more than 300% can be achieved. Finally, using a testbed implementation of one of the proposed algorithms, we show its feasibilty in real world VoIP implementations.

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References

  1. Jeong Y, Kakumanu S, Tsao C-L, Sivakumar R (2007) Improving VoIP call capacity over IEEE 802.11 networks. In: Proc IEEE BroadNets’07, Raleigh, 10–14 September 2007, pp 670–679

  2. KPhone (2009) KPhone homepage. http://www.wirlab.net/kphone

  3. SIP Express Router (2007) SIP Express Router homepage. http://www.iptel.org/ser

  4. Iperf. http://sourceforge.net/projects/iperf

  5. Markopoulou AP, Tobagi FA, Karam MJ (2002) Assessment of VoIP quality over internet backbones. In: Proc IEEE Infocom’02, New York, June 2002, pp 150–159

  6. Garg S, Kappes M (2002) On the throughput of 802.11b networks for VoIP. Avaya Labs Research, NJ, Tech. Rep. ALR-2002-012, Mar

  7. Wang W, Liew SC, Li VOK (2005) Solutions to performance problems in VoIP over a 802.11 wireless LAN. IEEE Trans Veh Technol 54(1):366–384, Jan

    Article  Google Scholar 

  8. Kliazovich D, Granelli F (2005) On packet concatenation with QoS support for wireless local area networks. In: Proc IEEE ICC’05, Seoul, May 2005, pp 1395–1399

  9. Kamerman A, Monteban L (1997) WaveLAN-II: a high-performance wireless LAN for the unlicensed band. Bell Labs Tech J 2(3):118–133, Aug

    Article  Google Scholar 

  10. The network simulator: ns-2. http://www.isi.edu/nsnam/ns

  11. Turin W, Nobelen RV (1998) Hidden Markov models for fading channels. IEEE J Sel Areas Commun 16(12):1809–1817, Dec

    Article  Google Scholar 

  12. Netfilter (2008) Netfilter homepage. http://www.netfilter.org

  13. Tcpdump/libpcap (2009) Tcpdump/libpcap homepage. http://www.tcpdump.org

  14. Madwifi (2005) Madwifi homepage. http://www.madwifi.org

  15. Hole DP, Tobagi FA (2004) Capacity of an IEEE 802.11b wireless LAN supporting VoIP. In: Proc IEEE ICC’04, Paris, June 2004, pp 196–201

  16. Yu J, Choi S, Lee J (2004) Enhancement of VoIP over IEEE 802.11 WLAN via dual queue strategy. In: Proc IEEE ICC’04, Paris, June 2004, pp 3706–3711

  17. Shin S, Schulzrinne H (2007) Experimental measurement of the capacity for VoIP traffic in IEEE 802.11 WLANs. In: Proc IEEE Infocom’07, Anchorage, May 2007, pp 2018–2026

  18. Tinnirello I, Choi S (2005) Efficiency analysis of burst transmissions with block ACK in contention-based 802.11e WLANs. In: Proc IEEE ICC’05, Seoul, May 2005, pp 3455–3460

  19. Li T, Ni Q, Turletti T, Xiao Y (2005) Performance analysis of the IEEE 802.11e block ACK scheme in a noisy channel. In: Proc IEEE BroadNets’05, Boston, October 2005, pp 551–557

  20. Xiao Y (2004) Packing mechanisms for the IEEE 802.11n wireless LANs. In: Proc IEEE Globecom’04, Dallas, November 2004, pp 3275–3279

  21. Kim Y, Choi S, Jang K, Hwang H (2004) Throughput enhancement of IEEE 802.11 WLAN via frame aggregation. In: Proc IEEE VTC’04-Fall, Los Angeles, September 2004, pp 3030–3034

  22. Holland G, Vaidya N, Bahl P (2001) A rate-adaptive MAC protocol for multi-hop wireless networks. In: Proc ACM MobiCom’01, Rome, July 2001, pp 236–250

  23. Lacage M, Manshaei MH, Turletti T (2004) IEEE 802.11 rate adaptation: a practical approach. In: Proc ACM MSWiM’04, Vancouver, October 2004, pp 126–134

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Authors and Affiliations

  1. Department of Multimedia System Engineering, SungKongHoe University, Seoul, Korea

    Yeonsik Jeong

  2. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA

    Sandeep Kakumanu, Cheng-Lin Tsao & Raghupathy Sivakumar

Authors
  1. Yeonsik Jeong
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  2. Sandeep Kakumanu
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  3. Cheng-Lin Tsao
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  4. Raghupathy Sivakumar
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Corresponding author

Correspondence to Yeonsik Jeong.

Additional information

An earlier version of this paper was published in the IEEE Conference on Broadband Communications, Networks, and Systems (BroadNets) 2007 [1]. This work was supported in part by the National Science Foundation under grants CNS-0519733 and CNS-0721296, and the Georgia Tech Broadband Institute. Yeonsik Jeong was also supported under the Korea Research Foundation Grant KRF-2005-214-D00362 funded by the Korean Government (MOEHRD).

This work was performed when Y. Jeong was a research scientist in the GNAN research group at Georgia Institute of Technology.

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Jeong, Y., Kakumanu, S., Tsao, CL. et al. VoIP over Wi-Fi Networks: Performance Analysis and Acceleration Algorithms. Mobile Netw Appl 14, 523–538 (2009). https://doi.org/10.1007/s11036-009-0157-6

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  • DOI: https://doi.org/10.1007/s11036-009-0157-6

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