Network VoIP for corporative environment design
TELE-INFO'08 Proceedings of the 7th WSEAS International Conference on Telecommunications and Informatics
Bearer reservation with preemption for voice call continuity
IEEE Transactions on Wireless Communications
Computer Networks: The International Journal of Computer and Telecommunications Networking
Improving session continuity through user mobility tracking for EPS inter-serving gateway handover
Wireless Communications & Mobile Computing
Anomaly detection in VoIP traffic with trends
Proceedings of the 24th International Teletraffic Congress
Anomaly detection in diurnal data
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Voice over IP is one of the most popular applications in broadband access networks. It is anticipated that the characteristics of call holding times (CHTs) for VoIP calls will be quite different from traditional phone calls. This article analyzes the CHTs for mobile VoIP calls based on measured data collected from commercial operation. Previous approaches directly used the Kolmogorov-Smirnov (K-S) test to derive the CHT distributions, which may cause inaccuracy. In this article we propose a new approach to derive the CHT distributions for mobile VoIP calls and other call types. Specifically, our approach uses hazard rate to select an appropriate distribution, and then utilizes the K-S test to validate our selection. We show that the mobile VoIP CHT distribution can be accurately approximated by a mix of two log-normal distributions. Based on the derived distributions, we compare the mobile VoIP CHTs with those for non-VoIP calls and fixed-network VoIP calls. Our study indicates that the characteristics for mobile VoIP calls are quite different from those of the non-VoIP mobile phone calls and are more close to those of fixed-network phone calls.