Alexander Poropatich

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The 3GPP IP Multimedia Subsystem (IMS) is currently expected to provide the basic architecture framework for the Next Generation Network which will bridge the traditional divide between circuit-switched and packet-switched networks and consolidate both sides into one single network for all services. Therefore , the imminent commercial roll-out of IMS will(More)
Quality of Service impairments in wireless and wired access networks for IP-based next generation networks (NGNs) differ fundamentally from the ones which we typically encounter in core networks. Examples include but are not limited to high delay, low bandwidth, and high jitter. Even though most NGN architectures claim to be access-agnostic, applications(More)
The 3GPP IP Multimedia Subsystem (IMS) is currently expected to provide the basic architecture framework for the Next Generation Network which will bridge the traditional divide between circuit-switched and packet-switched networks and consolidate both sides into one single network for all services. Therefore, the imminent commercial roll-out of IMS will(More)
One aspect highly neglected so far in Next Generation Networks development is that their access-agnostic service architecture requires NGN services to provide adequate user perception for a broad range of underlying access network technologies. Automated service testing for a wide variety of access technologies will therefore become indispensable in the(More)
The convergence of future fixed and wireless networking more and more requires solutions for transporting realtime application data to IP enabled mobile devices and mobile networks. Even if the general Mobile IPv6 protocol performs sufficient in macro environments with non-realtime requirements, seamless mobility demands some more enhanced protocol(More)
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