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J. Fabini, P. Reichl, C. Egger, M Happenhofer, M. Hirschbichler, L. Wallentin:
"Generic Access Network Emulation for NGN Testbeds";
Talk: 2008 4th International Conference on Testbeds and Research Infrastructure for the Development of Networks & Communities (Trident Com2008), Innsbruck, Österreich (invited); 03-18-2008 - 03-20-2008; in: "Proceedings of the 2008 4th International Conference on Testbeds and Research Infrastructure for the Development of Networks & Communities", (2008), ISBN: 9789639799240; Paper ID 3135, 10 pages.

Evaluating the user satisfaction with Next Generation Network applications requires, amongst others, to carefully study the impact of various access networks with differing performance characteristics. This paper presents the concept and implementation of a network emulator for IP-based packetswitched wired and wireless access technologies based on measurement results obtained in real access networks. We present a generic modeling process which consists of three stages: (1) metric and measurement methodology selection,
(2) measurements in real access networks, and (3) access network emulation based on the measurement results. Whereas the proposed modeling concept is generic and can be applied to any metric, the implementation part of this paper focuses on changes to the Open Source LinuxWAN emulator NetEm which are required to accurately emulate one-way delay for access networks. We propose two distinct emulation options and compare one-way delay measurement results for real access technologies against the emulated ones, emphasizing
limitations and pitfalls related to access network emulation in general.

Evaluating the user satisfaction with Next Generation Network applications requires, amongst others, to carefully study the impact of various access networks with differing performance characteristics. This paper presents the concept and implementation of a network emulator for IP-based packetswitched wired and wireless access technologies based on measurement results obtained in real access networks. We present a generic modeling process which consists of three stages: (1) metric and measurement methodology selection,
(2) measurements in real access networks, and (3) access network emulation based on the measurement results. Whereas the proposed modeling concept is generic and can be applied to any metric, the implementation part of this paper focuses on changes to the Open Source LinuxWAN emulator NetEm which are required to accurately emulate one-way delay for access networks. We propose two distinct emulation options and compare one-way delay measurement results for real access technologies against the emulated ones, emphasizing
limitations and pitfalls related to access network emulation in general.

Access Network Modeling, IP Multimedia Subsystem, IMS, Next Generation Networks, NGN, UMTS, Delay, Loss, Jitter