Resource and Admission Control Architecture and QoS Signaling Scenarios in Next Generation Networks
نویسندگان
چکیده
This paper examines the state-of-the-art in the development of resource and admission control architectures for Next Generation Networks (NGN). The approach taken is, initially, to present some basic concepts for understanding and discussing quality of service in the context of NGN. Following this, we consider current research activities in international standardization organizations and then a detailed discussion on Resource and Admission Control Functions (RACF) architecture proposed by ITU-T. After this survey, we introduce some SIP-based call flows for call set-up and termination in NGN considering the role of RACF and QoS signaling in the call flows. Various scenarios are presented regarding different concepts such as single/two-phase schemes and single/multi-domain networks. We clarify the difference between these scenarios according to their call flows. This results in a more accurate understanding of resource control models, architectures and protocols that have been introduced up to now.
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