The IMS Playground @ Fokus - An Open Testebed for Next Generation Network Multimedia Services
TRIDENTCOM '05 Proceedings of the First International Conference on Testbeds and Research Infrastructures for the DEvelopment of NeTworks and COMmunities
Provisioning end-to-end QoS under IMS over a WiMAX architecture: Research Articles
Bell Labs Technical Journal - General Papers
Inter-Domain QoS Control Mechanism in IMS based Horizontally Converged Networks
ICNS '07 Proceedings of the Third International Conference on Networking and Services
A Framework for Resource Control in WiMAX Networks
NGMAST '07 Proceedings of the The 2007 International Conference on Next Generation Mobile Applications, Services and Technologies
Journal of Network and Systems Management
Critical Issues for QoS Management and Provisioning in the IP Multimedia Subsystem
Journal of Network and Systems Management
Open source development tools for IMS research
Proceedings of the 4th International Conference on Testbeds and research infrastructures for the development of networks & communities
AQUILA: adaptive resource control for QoS using an IP-based layered architecture
IEEE Communications Magazine
IEEE Communications Magazine
Overview of ITU-T NGN QoS Control
IEEE Communications Magazine
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The IP Multimedia Subsystem (IMS) is a converged service enabler that facilitates the rapid deployment of multimedia services in IP networks. The IMS defines a Policy Based Management model to ensure QoS-enabled connectivity by providing mediation and interaction between applications and transport layer resources. This paper reviews the current state of the art regarding the necessary mediation between QoS control elements and transport layer resources in the IMS. An enhancement to discover end to end signaling and media routes is proposed. This mechanism uses SIP routing information to discover origin, destination and transit administrative domains, and allows an application to effectively issue resource requests from its home network and enable QoS-enabled connectivity across all traversed transport segments. We present a prototype implementation that demonstrates the service initiated QoS model, in addition to the proposed algorithm that allows home network based resource reservation across administrative domains. The testbed and proposed mechanism are subjected to validation and performance tests and results are presented; in particular the effects the proposed enhancements have on session setup delay and signaling overhead are examined.