Adaptive Rate Control for Aggregated VoIP Traffic

This paper presents a novel mechanism for dynamically adapting the quality of congestion controlled voice over IP (VoIP) applications on the Internet in real time. The system uses our proposed variable bit rate speech codec called Speex, which can dynamically adjust the encoding bit rate (and hence the speech quality) based on both the feedback information about the network congestion and the instantaneous speech properties. Our extensive NS2 simulation results prove that the proposed system indeed provides highest quality speech while maximising the bandwidth utilisation and reducing the network congestion.

[1]  Frank Miller,et al.  IAX: Inter-Asterisk eXchange Version 2 , 2010, RFC.

[2]  Deborah Estrin,et al.  Layered quality adaptation for Internet video streaming , 2000, IEEE Journal on Selected Areas in Communications.

[3]  Dina Katabi,et al.  Decoupling congestion control and bandwidth allocation policy with application to high bandwidth-delay product networks , 2002 .

[4]  Methods for objective and subjective assessment of quality Perceptual evaluation of speech quality ( PESQ ) : An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs , 2002 .

[5]  Adam Wolisz,et al.  Adaptive Coding and Packet Rates for TCP-Friendly VoIP Flows , 2005 .

[6]  Lingfen Sun,et al.  A new method for VoIP quality of service control use combined adaptive sender rate and priority marking , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[7]  Manfred R. Schroeder,et al.  Code-excited linear prediction(CELP): High-quality speech at very low bit rates , 1985, ICASSP '85. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[8]  Donald F. Towsley,et al.  Adaptive FEC-based error control for Internet telephony , 1999, IEEE INFOCOM '99. Conference on Computer Communications. Proceedings. Eighteenth Annual Joint Conference of the IEEE Computer and Communications Societies. The Future is Now (Cat. No.99CH36320).