Next Generation Network – A Study On QOS Mechanisms

Abstract

Next Generation Network (NGN) being an IP based network enables customers to receive voice, data and video over the same network. NGN offers reduced network and operational complexity resulting in better and reliable service. It offers unrestricted access by users to different service providers also supporting generalized mobility. Next Generation Network is capable of converging heterogeneous networks and provides converged services. Resource and Admission Control Function(RACF) is needed to support QoS of the SIP based converged services, which are per session based real time services, such as IP telephony and video telephony. We study the architecture of NGN though the transition from the legacy PSTN to an IP based NGN is an important issue and the QoS control scheme has a strong tendency of focusing on the edge and the access networks. We also present a hierarchical QoS control architecture for improvement of simplicity and scalability in the whole view of the NGN using a divide and conquer strategy which separates interesting objects that are the core and
the access networks. We present the Markova modeling of the per session based centralized control scheme and the distributed traffic engineering scheme(e.g. RSVPTE, CRLDP) for the verification of control costs.