Introduction to the Functional Architecture of NGN

Naotaka MORITA  Hideo IMANAKA  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.5   pp.1022-1031
Publication Date: 2007/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.5.1022
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Advanced Transfer Technologies for the Next Generation Network)
NGN,  IMS,  functional architecture,  stratum,  emulation,  simulation,  

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In July 2006, International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) Study Group 13 initiated the approval process for a batch of framework Recommendations on the Next Generation Network (NGN) Release 1. One of the new Recommendations, Y.2012, illustrates the NGN from the viewpoint of a functional architecture consisting of various functional blocks, namely functional entities. In conjunction with this Recommendation, this paper explains how the NGN can be built and how the NGN utilizes functional entities to provide expected services and required capabilities. This paper also identifies open issues for extending the functional architecture towards Release 2.