A performance comparison of multi-hop wireless ad hoc network routing protocols
MobiCom '98 Proceedings of the 4th annual ACM/IEEE international conference on Mobile computing and networking
Analysis of link failures in an IP backbone
Proceedings of the 2nd ACM SIGCOMM Workshop on Internet measurment
The 3G IP Multimedia Subsystem (IMS): Merging the Internet and the Cellular Worlds, Second Edition
The 3G IP Multimedia Subsystem (IMS): Merging the Internet and the Cellular Worlds, Second Edition
The HTI lab @ ftw: user research for telecom systems
CHI '06 Extended Abstracts on Human Factors in Computing Systems
A system for locating mobile terminals with tunable privacy
Journal of Theoretical and Applied Electronic Commerce Research
Location-based assisted handover for the IP Multimedia Subsystem
Computer Communications
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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. There-fore, the imminent commercial roll-out of IMS will have immense impact both for the migration of the core network as well as the integration of future mobile services and applications. This paper presents an OpenSER-based experimental testbed which has been designed as a minimal standard-compliant IMS core network. We discuss major practical requirements and describe our implementation of this "IMS in a bottle" approach. Furthermore, we introduce a terminal-based native IMS location service enabler. We argue that physical location data can be regarded as a type of presence information and propose an architecture which reuses a large part of the IMS presence infra-structure by applying presence mechanisms, like notification handling, access control and privacy management, to location data. We demonstrate that the realization of this service can be integrated efficiently into the IMS core environment, and present initial evaluation results for the joint demonstrator. Finally, important current and future challenges including migration, interworking, charging, Quality-of-Service, identity management, security, and regulatory aspects, are discussed in detail, thus ending up with an up-to-date research agenda.