TY - GEN
T1 - Improving VoIP quality through path switching
AU - Tao, Shu
AU - Xu, Kuai
AU - Estepa, Antonio
AU - Fei, Teng
AU - Gao, Lixin
AU - Guérin, Roch
AU - Kurose, Jim
AU - Towsley, Don
AU - Zhang, Zhi Li
PY - 2005
Y1 - 2005
N2 - The current best-effort Internet cannot readily provide the service guarantees that VoIP applications often require. Path switching can potentially address this problem without requiring new network mechanisms, simply by leveraging the robustness to performance variations available from connectivity options such as multi-homing and overlays. In this paper, we evaluate the effectiveness and benefits of path switching in improving the quality of VoIP applications, and demonstrate its feasibility through the design and implementation of a prototype gateway. We argue for an application-driven path switching system that accounts for both network path characteristics and application-specific factors (e.g., codec algorithms, playout buffering schemes). We also develop an application path quality estimator based on the ITU-T E-model for voice quality assessment, and an application-driven path switching algorithm that dynamically adapts the time scales over which path switching decisions are made to maximize voice quality. Through network emulation and experiments over a wide-area multi-homed testbed, we show that, with sufficient path diversity, path switching can yield meaningful improvements in voice quality. Hence by exploiting the inherent path diversity of the Internet, application-driven path switching is a viable option in providing quality-of-service to applications.
AB - The current best-effort Internet cannot readily provide the service guarantees that VoIP applications often require. Path switching can potentially address this problem without requiring new network mechanisms, simply by leveraging the robustness to performance variations available from connectivity options such as multi-homing and overlays. In this paper, we evaluate the effectiveness and benefits of path switching in improving the quality of VoIP applications, and demonstrate its feasibility through the design and implementation of a prototype gateway. We argue for an application-driven path switching system that accounts for both network path characteristics and application-specific factors (e.g., codec algorithms, playout buffering schemes). We also develop an application path quality estimator based on the ITU-T E-model for voice quality assessment, and an application-driven path switching algorithm that dynamically adapts the time scales over which path switching decisions are made to maximize voice quality. Through network emulation and experiments over a wide-area multi-homed testbed, we show that, with sufficient path diversity, path switching can yield meaningful improvements in voice quality. Hence by exploiting the inherent path diversity of the Internet, application-driven path switching is a viable option in providing quality-of-service to applications.
UR - http://www.scopus.com/inward/record.url?scp=25644461198&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=25644461198&partnerID=8YFLogxK
U2 - 10.1109/INFCOM.2005.1498514
DO - 10.1109/INFCOM.2005.1498514
M3 - Conference contribution
AN - SCOPUS:25644461198
SN - 0780389689
T3 - Proceedings - IEEE INFOCOM
SP - 2268
EP - 2278
BT - Proceedings - IEEE INFOCOM 2005. The Conference on Computer Communications - 24th Annual Joint Conference of the IEEE Computer and Communications Societies
A2 - Makki, K.
A2 - Knightly, E.
T2 - IEEE INFOCOM 2005
Y2 - 13 March 2005 through 17 March 2005
ER -