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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29640


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1507
VoIP and Database Traffic Co-existence over IEEE 802.11b WLAN with Redundancy
Abstract:
This paper presents the findings of two experiments that were performed on the Redundancy in Wireless Connection Model (RiWC) using the 802.11b standard. The experiments were simulated using OPNET 11.5 Modeler software. The first was aimed at finding the maximum number of simultaneous Voice over Internet Protocol (VoIP) users the model would support under the G.711 and G.729 codec standards when the packetization interval was 10 milliseconds (ms). The second experiment examined the model?s VoIP user capacity using the G.729 codec standard along with background traffic using the same packetization interval as in the first experiment. To determine the capacity of the model under various experiments, we checked three metrics: jitter, delay and data loss. When background traffic was added, we checked the response time in addition to the previous three metrics. The findings of the first experiment indicated that the maximum number of simultaneous VoIP users the model was able to support was 5, which is consistent with recent research findings. When using the G.729 codec, the model was able to support up to 16 VoIP users; similar experiments in current literature have indicated a maximum of 7 users. The finding of the second experiment demonstrated that the maximum number of VoIP users the model was able to support was 12, with the existence of background traffic.
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References:


[1] R. Al-Sayyed, C. Pattinson, ''Performance Evaluation of Redundancy in Wireless Network'', Proc. of Second IFIP International Conference on Wireless and Optical Comm Networks WOCN 2005, Dubai, 6-8 March, 2005.
[2] Jakob Nielsen, ''Response Times: The Three Important Limits'', Usability Engineering, Chapter 5, Morgan Kaufman, San Francisco, 1994.
[3] D. Hole and F. Tobagi, ''Capacity of an IEEE 802.11b Wireless LAN supporting VoIP'', Procedding of IEEE Int. Conference on Communications (ICC) 2004.
[4] Coupechoux, M., Kumar, V., and Brignol, L., "Voice over IEEE 802.11b Capacity," Proc. of the 16th ITC Specialist Seminar on Performance Evaluation of Wireless and Mobile Networks, Sept. 2004.
[5] ITU-T Recommendation G.114, One way transmission time,ITU-T, May. 2003.
[6] L. Cai and X. Shen, ''Voice Capacity Analysis of WLAN With Unbalanced Traffic'', IEEE Transactions on Vehicular Technology, Vol. 55, No. M3, May 2006.
[7] Garg, S., and Kappes, M., "Can I add a VoIP call?" Proc.of IEEE ICC'03, vol. 2, pp. 779--783, May 2003.
[8] Garg S, Kappes M. ''An experimental study of throughput for UDP and VoIP traffic in IEEE 802.11b networks'', Proceedings of the IEEE WCNC'03, vol. 3, New Orleans, LA, U.S.A., March 2003; 1748-1753
[9] Shim C, Xie L, Zhang B, Sloane C. ''How delay and packet loss impact voice quality in VoIP'', Technical Report, Qovia, Inc., December 2003.
[10] D. P. Agrawal, Q. Zeng, ''Introduction to Wireless and Mobile System'', Thomson, Brooks/Cole, 2003, pp: 337-392.
[11] http://www.wainhouse.com/files/papers/wr-qos-in-ip-networks.pdf
[12] http://www.adec.edu/nsf/Summary%20Test%20H.323.v7.pdf

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