1、Printed in SwitzerlandGeneva, 2005International Telecommunication UnionInternationalTelecommunicationUnionITU-T NGN FG Proceedings PartI 2005ITU-TNGN FGProceedingsPart IGlobal Standards InitiativeNext Generation Network ITU-T2005International Telecommunication Union ITU-T NGN FG Proceedings Part I I
2、TU 2005 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. i Preface By Houlin Zhao, Director of the Telecommunication Standardization Bureau, ITU In the first half of 2004, I was asked by some ITU-T members to he
3、lp progress work on global NGN standards and assist in bringing some clarity to the standardization efforts on NGN. I was told that there was an urgent need to produce globally applicable specifications in the field and coordinate global standardization; our members saw ITU as the most appropriate b
4、ody to take the lead. The timing of the request coincided with a period of intense preparation for the World Telecommunication Standardization Assembly (WTSA-04), which was held in October 2004, and which is the regular event that defines the future work of ITU-T for the coming period, in this case
5、2005-2008. But given its urgency ITU-T Members felt that initiative was needed to act quickly, rather than waiting for the mandate of WTSA. There are rules and regulations that have been built and honed over a number of years, and that are an important part of keeping the organization and the creati
6、on of standards cohesive and professional to meet the needs of Member states as well as industry/Sector Members in a timely way. ITU-T is an organization with flexibility, transparency and fairness. Operators from around the globe are implementing NGN strategies and plan to invest billions of dollar
7、s in the rollout of new Internet Protocol (IP) based networks. The operators, systems vendors and government members of ITU-T believe that international standards will facilitate a global market for systems, lowering costs and providing for mix-and-match implementation and global interoperability. W
8、ith all of this in mind, with the advice and support from Sector Members, I took the unprecedented step of setting-up, under my own name, as the Director of TSB the ITU-T Focus Group on NGN (FGNGN) to work on global standards for NGN. The work of the new group was to build on existing fixed/mobile c
9、onvergence architecture to provide transparency between fixed and mobile networks. Work would progress in the areas of quality of service (QoS), authentication, security and signalling. Since the creation of FGNGN there have been intensive meetings, more or less every two months. We have seen a grow
10、th in participation and the number of contributions. I am very pleased with the progress and the results achieved by the FGNGN. These first results will provide the building blocks on which the worlds systems vendors and service providers can start to make this monumental shift to NGN. Noting the pr
11、ogress we have made, and the new situation in which we are today, we decided to further strengthen our work with the NGN-Global Standards Initiative (NGN-GSI), the next phase of our NGN work, which is I believe a judicious move to lead and to enhance ITU-T efforts on NGN study. I welcome the fact th
12、at industry and Member states entrusted this work to ITU-T. Now I am proud to present here the groups achievements. This publication represents an impressive accomplishment in such a short time. It is my pleasure to provide here this material along with information on the future direction of NGN wor
13、k in ITU-T. I sincerely hope that you will find this publication useful. November 2005 Houlin Zhao TSB Director ii iii Foreword Chae-Sub Lee, Chairman, ITU-T Focus Group on Next Generation Networks (FG NGN) It took more than one and half years to get a globally agreed definition on NGN, with the JRG
14、 (Joint Rapporteur Group) on NGN starting work in October 2003 in ITU-T SG13. This was one of the hardest jobs during my almost 20 years of international standards activity. From the beginning, work on NGN brought a lot of questions rather than visions and solutions. I believe many of these question
15、s related to the name “Next Generation Networks”. Throughout the whole of my standards career, it was the first time I have come across this strange name. How does one identify “Next Generation”? For me this may mean, for example my children or maybe my grandchildren. Furthermore, from the network p
16、oint of view, what meaning is implied in this kind of generation concept? Bearing in mind all these difficulties and issues, FGNGN was launched 23 June 2004 under the responsibility of the TSB Director, Mr. Houlin Zhao with his strong futuristic vision conveying also the ITU-T members ambitions. As
17、expected, the sailing at the start was not smooth and with many questions, concerns, worries and even objections, it felt like a hurricane. This situation continued until the 2ndmeeting, but the positive spirit and strong ambitions of members gave us hope and confidence that we would reach our objec
18、tive. FGNGN started its work mainly with several drafts which were studied and transferred by the JRG on NGN. Now it has achieved 18 approved deliverables and on-going drafts which will be developed further through relevant Study Groups. FGNGN deliverables cover mainly seven working areas which are
19、clearly given by the terms of reference as fundamental framework areas of NGN; services and capabilities, functional architecture and requirements, quality of service (QoS), control aspects, security issues, migration of current networks into NGN and future packet based network requirements. FGNGN w
20、as made-up of seven working groups according to each study area, with three technical leaders in each group. Its final output was a total of 30 documents. A few of them were already approved during the meetings and transferred to the relevant Study Groups for their further consideration. Deliverable
21、s are classified by release concepts with Release 1, beyond Release 1 and Release independent. This book contains the deliverables with their status indication clearly noted for example; approved (A) by the FGNGN for further consideration by relevant ITU-T SG, stable (S) and draft (D) from the FGNGN
22、 point-of-view. These deliverables cover all seven working areas. So I hope this book will help readers with answers to questions similar to those I had had before. During the 18-month life-time of FGNGN, nine meetings (one meeting at every two months and in some case within four weeks) were organiz
23、ed and we received more than 1,200 input documents and also had more than 1,400 participants. We normally extended our meeting time and frequently sacrificed national holidays of many members. With all our members efforts and sacrifices, especially with the best expertise of our technical leaders an
24、d vice chairmen, and an industrious and efficient TSB FGNGN secretariat we successfully reached our goal. I really want to share my great thanks and appreciation with our members, especially technical leaders and vice chairmen and the TSB secretariat. And especially thanks to God for these achieveme
25、nts and also for giving us two babies to our members during our meetings: one to a technical leaders family and another to an editors family in Europe and Asia respectively. I believe we all in FGNGN did good work for these next generation babies. November 2005 Chae Sub Lee Chairman of FGNGN iv v TA
26、BLE OF CONTENTS Part I Next Generation Networks Framework 1 ITU-T NGN Framework 2 Overview of FGNGN activities 3 Roadmap for future steps 4 Overview of the Working Group activities and achievements 5 Further information on ITU-T, useful web links and tutorial and presentation material Annex A Struct
27、ure and Management team of FGNGN Annex B FGNGN meetings (2004 2005) Annex C List of participating companies Annex D NGN Focus Group deliverables status Annex E Useful links to ITU-T pages Annex F Study Group 13 report to TSAG in November 2005 on NGN activities and future working arrangements for NGN
28、 studies Annex G ITU-T NGN Industry event presentations Annex H TSB Circular 236 and Addendum 1 Annex I ITU-T Information Part II NGN Focus Group Deliverables*NGN Focus Group deliverables status, as indicated by FGNGN at its 9thmeeting, 14-17 November 2005 Section 1 Release Independent Deliverables
29、Working Group 2 deliverables Functional architecture and mobility P 1.1 Framework for customer manageable IP network D 1.2 Terms, definitions and high level terminological framework for NGN Working Group 3 deliverables Quality of Service D 1.3 General Aspects of Quality of Service and Network Perfor
30、mance in the NGN A 1.4 Network performance of non-homogeneous networks in NGN _ *Legend P Already passed to ITU-T Study Group 13; one already published as Q.Supplement 51 A Sufficiently mature to be considered by ITU-T Study Group 13 for publication S Mature but would require further consideration i
31、n ITU-T Study Group 13 D Not yet mature, requires discussion and technical input to complete development vi Section 2 Release 1 Deliverables Working Group 1 deliverables Service Requirements A 2.1 NGN Release 1 scope A 2.2 NGN Release 1 requirements Working Group 2 deliverables Functional Architectu
32、re and mobility A 2.3 Functional Requirements and Architecture of the NGN A 2.4 Mobility management capability requirements for NGN A 2.5 IMS for Next Generation Networks A 2.6 PSTN/ISDN emulation architecture Working Group 3 deliverables Quality of Service P 2.7 A QoS control architecture for Ether
33、net-based IP access network S 2.8 Multi service provider NNI for IP QoS D 2.9 Requirements and framework for end-to-end QoS in NGN D 2.10 The QoS Architecture for the Ethernet Network D 2.11 Functional requirements and architecture for resource and admission control in NGN D 2.12 A QoS framework for
34、 IP-based access networks A 2.13 Performance measurement and management for NGN P 2.14 Algorithms for achieving end to end performance objectives Working Group 4 deliverables Control and Signalling Capability P 2.15 Signalling requirements for IP QoS (published as ITU-T Q-series Supplement 51) Worki
35、ng Group 5 deliverables Security Capability A 2.16 Security requirements for NGN Release 1 D 2.17 Guidelines for NGN-security for Release 1 Working Group 6 deliverables Evolution A 2.18 Evolution of networks to NGN A 2.19 PSTN/ISDN evolution to NGN A 2.20 PSTN/ISDN emulation and simulation Section 3
36、 Beyond Release 1 Deliverables Working Group 2 deliverables Functional Architecture and mobility D 3.1 Softrouter requirements D 3.2 Converged services framework functional requirements and architecture Working Group 7 deliverables Future Packet-based Bearer Networks P 3.3 Problem statement A 3.4 FP
37、BN requirements A 3.5 FPBN high-level architecture D 3.6 FPBN candidate technologies NGN Focus Group Proceedings Part I 1 1 ITU-T NGN Framework Brief explanation/Definition of NGN ITU-T recommendation Y.2001 identified a definition of NGN as explain below. Next Generation Network (NGN): a packet-bas
38、ed network able to provide telecommunication services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unfettered access by users to different service provid
39、ers. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users. And this recommendation further specifies key features of NGN as following: Packet-based transfer Separation of control functions among bearer capabilities, call/session, and application/
40、 service Decoupling of service provision from transport, and provision of open interfaces Support for a wide range of services, applications and mechanisms based on service building blocks (including real time/ streaming/ non-real time services and multi-media) Broadband capabilities with end-to-end
41、 QoS (Quality of Service). Interworking with legacy networks via open interfaces Generalized mobility Unfettered access by users to different service providers A variety of identification schemes Unified service characteristics for the same service as perceived by the user Converged services between
42、 Fixed/Mobile Independence of service-related functions from underlying transport technologies Support of multiple last mile technologies Compliant with all Regulatory requirements, for example concerning emergency communications, security, privacy, and etc. 2 Overview of FGNGN activities In 2003 a
43、Joint Rapporteur Group bringing together experts from across all Questions of Study Group 13 was formed. The main subjects studied by the Joint Rapporteur Group on NGN (JRG-NGN) were: NGN requirements, the general reference model, functional requirements and architecture of the NGN, and evolution to
44、 NGN. The JRG-NGN produced two fundamental Recommendations, viz. Y.2001, General overview of NGN and Y.2011, General principles and general reference model for next generation networks. On 7 May 2004, the ITU-T established a new Focus Group under the ITU-T Director to address the urgent need for ini
45、tial global standards for Next Generation Networks (NGN). 2.1 Terms of Reference of FGNGN Mandate of FGNGN is identified clearly through ITU-T TSB Circular 236 (Geneva, 18 May 2004) and Addendum 1 as follows: The Focus Group on Next Generation Networks (FGNGN) is mandated to create its deliverables
46、within 12 months concerning the following three topics: A nomadicity architecture (for example, based on 3GPP/3GPP2 IMS) that includes support for broadband xDSL access. QoS in the xDSL access, Authentication and Security issues need to be resolved 2 NGN Focus Group Proceedings Part I Current NGN ac
47、tivities within SG 11 and SG 13 on QoS Signalling include IP QoS aspects and other NGN signaling related requirements Other NGN-related documents that have been initiated within the JRG-NGN, but have not been CONSENTED by June 22, 2004. Based on this, some of modification was made at the 2ndFGNGN me
48、eting at Geneva, Switzerland, 19 - 23 July 2004. Final agreed ToR of each working areas are shown as follows: 2.1.1 NGN Functional Architecture This study will describe the functional and structural architecture of the NGN using the generic definitions, symbols and abbreviations that are defined in
49、related ITU-T Recommendations. This study will include xDSL and IMS Architectures. The work will take account of the NGN work already undertaken in ITU-T and other organizations e.g.: Draft Rec. Y.NGN-Overview, Y.NGN-SRQ and Y.NGN-GRM from Q1/13 and Q11/13 Draft Rec. Y.NGN-FRA : Functional Architecture of NGN from Q1/13 IMS release 6 : 3GPP, MMD : 3GPP2 xDSL Architecture : Q C/16, DSL Forum TR 058 and 059 2.1.2 Nomadicity and Mobility This study identifies requirements about various t
