Author(s)

Tanir Ozcelebi, Igor Radovanovic, Debraj Sengupta

Eindhoven University of Technology, PO Box 213, 5600 MB, Eindhoven, The Netherlands.
ICT Embedded BV. PO Box 6420, 5600 HK, Eindhoven, The Netherlands.

IP Multimedia Subsystem (IMS) allows the use of unlicensed, non-dedicated and nondeterministic access networks for delivering IP multimedia services. Providing end-to-end Quality-of-Service (QoS) for resource demanding real-time services (e.g. real-time multimedia) over such networks is a challenging task due to varying resource availability of the network and the end-device during a single session . A common solution to this problem is adapting service quality and type according to availability of system resources, which requires end-to-end monitoring and signaling of resource availability during a single session. This paper presents an extension of the IMS architecture for real-time resource availability monitoring and signaling. The novelty of the proposed extension is twofold. It takes into account uncon-trolled access networks with no resource reservation on the one hand, and end devices on the other. Two system archi-tecture components are introduced for monitoring and signaling of the real-time resource availability in both networks (e.g. bandwidth, buffer space), and end-devices (e.g. battery, CPU, memory, storage), namely a Resource Manager (RM) and a Resource Availability Server (RAS). Our solution does not require any modifications of the IMS architec-ture and can be implemented as a plug-in.

End-to-end quality of service, IP Multimedia Subsystem, resource management, Session Initiation Protocol

Ozcelebi, T. , Radovanovic, I. and Sengupta, D. (2008) Real-Time Resource Availability Signaling in IP Multimedia Subsystem Networks. Journal of Service Science and Management, 1, 128-134. doi: 10.4236/jssm.2008.12013.