Application-layer mobility using SIP
ACM SIGMOBILE Mobile Computing and Communications Review
Mobisense testbed: merging user perception and network performance
Proceedings of the 4th International Conference on Testbeds and research infrastructures for the development of networks & communities
Dynamic bayesian networks for sequential quality of experience modelling and measurement
NEW2AN'11/ruSMART'11 Proceedings of the 11th international conference and 4th international conference on Smart spaces and next generation wired/wireless networking
A comparative analysis of the perceived quality of VoIP under various wireless network conditions
WWIC'10 Proceedings of the 8th international conference on Wired/Wireless Internet Communications
Survey on application-layer mechanisms for speech quality adaptation in VoIP
ACM Computing Surveys (CSUR)
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In NGNs, handovers between different wireless access technologies provide seamless roaming during voice calls. The resulting speech quality depends on the audio bandwidth of the speech codecs used in the respective networks, as well as on degradations resulting from the handover, coding, and packet loss. We present the results of four listening experiments where speech quality is quantified as a function of network and codec characteristics, and compare them to estimations obtained from instrumental models. The results show when and under which circumstances a network handover and/or codec changeover should be scheduled in order to obtain better speech quality. This is important for the development of high-quality roaming strategies.