iVoIP: an intelligent bandwidth management scheme for VoIP in WLANs
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Voice over Internet Protocol (VoIP) has been widely used by many mobile consumer devices in IEEE 802.11 wireless local area networks (WLAN) due to its low cost and convenience. However, delays of all VoIP flows dramatically increase when network capacity is approached. Additionally, unfair traffic distribution between downlink and uplink flows in WLANs impacts the perceived VoIP quality. This paper proposes an intelligent bandwidth management scheme for VoIP services (iVoIP) that improves bandwidth utilization and provides fair downlink–uplink channel access. iVoIP is a cross-layer solution which includes two components: (1) iVoIP-Admission Control, which protects the quality of existing flows and increases the utilization of wireless network resources; (2) iVoIP-Fairness scheme, which balances the channel access opportunity between access point (AP) and wireless stations. iVoIP-Admission Control limits the number of VoIP flows based on an estimation of VoIP capacity. iVoIP-Fairness implements a contention window adaptation scheme at AP which uses stereotypes and considers several major quality of service parameters to balance the network access of downlink and uplink flows, respectively. Extensive simulations and real tests have been performed, demonstrating that iVoIP has both very good VoIP capacity estimation and admission control results. Additionally, iVoIP improves the downlink/uplink fairness level in terms of throughput, delay, loss, and VoIP quality.
KeywordsVoIP QoS Admission control Fairness Downlink/uplink IEEE 802.11
This work was supported in part by Enterprise Ireland Innovation Partnership programme.
- 2.Ericsson connectivity report, http://www.ericsson.com/res/thecompany/docs/corpinfo/reports/ericsson_connectivity_report_feb2011.pdf, February 2011.
- 5.Yuan, Z., Venkataraman, H., & Muntean, G.-M. (2010). iPAS: An user perceived quality-based intelligent prioritized adaptive scheme for IPTV in wireless home networks. IEEE international symposium on broadband multimedia systems and broadcasting (BMSB) (pp. 1–6). Shanghai, China.Google Scholar
- 8.Yuan, Z., Venkataraman, H., & Muntean, G.-M. (2009). iBE: A novel bandwidth estimation algorithm for multimedia services over IEEE 802.11 wireless networks. 12th IFIP/IEEE international conference on management of multimedia and mobile networks and services (MMNS) (pp. 69–80). Venice, Italy.Google Scholar
- 9.Pong, D., & Moors, T. (2003). Call admission control for IEEE 802.11 contention access mechanism. IEEE global communications conference (GLOBECOM) (pp. 174–178). San Francisco, CA.Google Scholar
- 12.Yuan, Z., Venkataraman, H., & Muntean, G.-M. (2010). iPAS: An user perceived quality-based intelligent prioritized adaptive scheme for IPTV in wireless home networks. IEEE international symposium on broadband multimedia systems and broadcasting (BMSB) (pp. 1–6). Shanghai, China.Google Scholar
- 16.(2005). Wireless LAN medium access control (MAC) and physical layer (PHY) specifications amendment-quality of service enhancements. IEEE 802.11e, IEEE Standard for Information Technology.Google Scholar
- 24.Muntean, C. H., Muntean, G. M., McManis, J., & Cristea, A. I. (2007). Quality of experience-LAOS: Create once, use many, use anywhere. International Journal of Learning Technology, 3(3), 209–229.Google Scholar
- 25.Muntean, C. H., & McManis, J. (2004). A QoS-aware adaptive web-based system. IEEE International Conference on Communications (ICC) (pp. 2204–2208). Paris, France.Google Scholar
- 27.Yuan, Z., Venkataraman, H., & Muntean, G.-M. (2012). A novel bandwidth estimation algorithm for IEEE 802.11 TCP data transmissions. IEEE wireless communications and networking conference (WCNC) workshop on wireless vehicular communications and networks (pp. 377–382). Paris, France.Google Scholar
- 29.Schulzrinne, H., Casner, S., Frederick, R., & Jacobson, V. (2003). RTP: A transport protocol for real-time applications. Internet Engineering Task Force, RFC3550.Google Scholar
- 30.(2009). IEEE 802.21-2008, standard for local and metropolitan area networks-part 21: Media independent handover services. IEEE Computer Society.Google Scholar
- 32.Chatzimisios, P., Boucouvalas, A. C., & Vitsas, V. (2004). Performance analysis of IEEE 802.11 DCF in presence of transmission errors. IEEE International Conf. Communications (ICC) (pp. 3854–3858). Paris, France.Google Scholar
- 33.(1988). Pulse code modulation (PCM) of voice frequencies. ITU-T Recommendation G.711.Google Scholar
- 34.Oouch, H., Takenaga, T., Sugawara, H., & Masugi, M. (2002). Study on appropriate voice data length of IP packets for VoIP network adjustment. In IEEE global telecommunications conference (GLOBECOM) (pp. 1618–1622). Taiwan, China.Google Scholar
- 36.International Telecommunication Union. (1996). Coding of speech at 8 kbps using conjugate structure algebraic-codec-excited linear-prediction. ITU-T Recommendation G. 729.Google Scholar
- 37.Andersen, S., Duric, A., Astrom, H., Hagen, R., Kleijn, W., & Linden, J. (2004). Internet low bit rate codec (iLBC). Google Scholar
- 38.Muntean, C. H., & McManis, J. (2004). A QoS-aware adaptive web-based system. IEEE international conference communications (ICC) (pp. 2204–2208). Paris, France.Google Scholar
- 39.Recommendation ITU-T P.800. (1996). Methods for subjective determination of transmission quality. ITU-T, Geneva.Google Scholar
- 40.Schulzrinne, H., Casner, S., Frederick, R., & Jacobson, V. (1996). RTP: A transport protocol for real-time applications. RFC1889, http://www.ieft.org/rfc/rfc1889.txt.
- 42.Haykin, S. (2000). Communication systems. Hoboken, NJ: Wiley.Google Scholar
- 43.Comer, D. E. (2006). Internetworking with TCP/IP (5th ed.). Upper Saddle River, NJ: Prentice Hall.Google Scholar
- 45.SIPp. [Online]. Available: http://sipp.sourceforge.net.
- 46.Wireshark. [Online]. Available: http://www.wireshark.org.
- 47.(1999). IEEE 802.11b, part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) specifications: higher-speed physical layer extension in the 2.4 GHz band, supplement to IEEE 802.11 Std.Google Scholar
- 48.ITU-T Rec.G.114. (2003). One-way transmission time.Google Scholar
- 49.Jain, R., Chiu, D. M., & Hawe, W. (1984). A quantitative measure of fairness and discrimination for resource allocation in shared systems. Digital Equipment Corporation, Technical Report, DEC-TR-301.Google Scholar
- 50.ITU-T Recommendation G.107. (1998). The E-Model, a computational model for use in transmission planning.Google Scholar