Assessment of VoIP quality over Internet backbones
Proceedings - IEEE INFOCOM - Tập 1 - Trang 150-159 vol.1
Tóm tắt
As the Internet evolves into a ubiquitous communication infrastructure and provides various services including telephony, it has to stand up to the toll quality standards set by traditional telephone companies. Our objective is to assess to what extent today's Internet meets this expectation. Our assessment is based on delay and loss measurements taken over wide-area backbone networks, considers realistic VoIP scenarios and uses quality measures appropriate for voice. Our findings indicate that although voice services can be adequately provided by some ISPs, a significant number of paths lead to poor performance even for excellent VoIP end-systems. This makes a strong case for special handling of voice traffic on those paths. Even on the good paths, rare loss events can occasionally cause perceptible degradation of voice quality. Finally, the appropriate choice of the playout buffer scheme for each path was found to be of critical importance for the perceived quality.
Từ khóa
#Internet telephony #Spine #Delay #Telecommunication traffic #Loss measurement #Web and internet services #Degradation #IP networks #Communication standards #Communication networksTài liệu tham khảo
10.1109/49.81952
jiang, 0, QoS measurement of real-time multimedia services in the internet
10.1109/INFCOM.2001.916273
2000, One way transmission time
jiang, 0, Analysis of on-off patterns in VoIP and their effect on voice traffic aggregation, Proc ICC'2000
1998, Application of the emodel: A planning guide
2001, Transmission impairments due to speech processing
10.1109/TCOM.1985.1096385
1998, The emodel, a computational model for use in transmission planning
10.1109/ICASSP.2001.941202
10.1109/65.660003
markopoulou, 0, An adaptive playout that optimizes the perceived VoIP quality
10.1007/s005300050073
10.1109/65.730750
ramachandran, 0, Adaptive playout mechanisms for packetized audio applications in wide-area networks, Proc IEEE Infocom 1994
schulzrinne, 0, Advanced internet systems" on the "public switched telephone system
10.1109/JSAC.1986.1146402
0, Robust auto tool (RAT)
vleeschauwer, 2000, Quality bounds for packetized voice transport
cox, 1999, Results of a subjective listening test for G.711 with frame erasure concealment
0, Playout delay enhancements for VoIP
1999, Continuous assessment of time-varying subjective vocal quality and its relationship with overall subjective quality
10.1002/j.1538-7305.1965.tb04135.x
voran, 0, Speech quality of G.723.1 coding with added temporal discontinuity impairments, Proc of ICASSP May 2001
2000, QoS measurement methodologies
clark, 2001, Comparison of TS101 329-5 annex E with emodel
clark, 2001, Comparison of TS 101 329-5 annex E with PAMS and PSQM
walker, 0, Evaluating data networks for VoIP
clark, 0, Modeling the effects of burst packet loss and recency on subjective voice quality, Proc of IP Telephony Workshop March 2001
2000, Study of the relationship between instantaneous and overall subjective speech quality for time-varying quality speech sequences: Influence of the recency effect
2001, Actual measurements of network and terminal characteristics and performance parameters in TIPHON networks and their influence on voice quality