1、 International Telecommunication Union ITU-T Y.2111TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2011) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Next Generation Networks Quality of Service and performance Resource and admission control
2、functions in next generation networks Recommendation ITU-T Y.2111 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network asp
3、ects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access,
4、 network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 IPTV over NGN Y.1900Y.1999 NEXT GEN
5、ERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Numbering, naming and
6、addressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Smart ubiquitous networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 Future networks Y.3000Y.3099 For further details
7、, please refer to the list of ITU-T Recommendations. Rec. ITU-T Y.2111 (11/2011) i Recommendation ITU-T Y.2111 Resource and admission control functions in next generation networks Summary Recommendation ITU-T Y.2111 specifies the functional architecture and requirements for the resource and admissio
8、n control functions (RACF) in next generation networks (NGN), which may involve a variety of access and core transport technologies and multiple domains. The RACF provides real-time application-driven and policy-based transport resource management in support of end-to-end quality of service (QoS), g
9、ate control, network address translation, and traversal of remote network address translators. The RACF is not service-specific. Services can make use of RACF whether the IP multimedia subsystem is involved or not. In particular, this edition of Recommendation ITU-T Y.2111 includes extensions to the
10、 2008 edition to address issues related to the interaction with 3GPP policy control functionalities, resource and admission control between NGNs and RACF-unaware IP networks, wholesale, time-shifted TV services, QoS downgrading, mobility, resource and admission control based on user subscription pro
11、file, support of deep packet inspection (DPI), communication between RACF and management of performance measurement (MPM), policy-based charging control, and IPTV service by invitation. History Edition Recommendation Approval Study Group 1.0 ITU-T Y.2111 2006-09-13 13 2.0 ITU-T Y.2111 2008-11-13 13
12、3.0 ITU-T Y.2111 2011-11-29 13 ii Rec. ITU-T Y.2111 (11/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU
13、-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four y
14、ears, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the ne
15、cessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. Howe
16、ver, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative
17、 equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use o
18、f a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, I
19、TU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.i
20、nt/ITU-T/ipr/. ITU 2012 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Y.2111 (11/2011) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms d
21、efined in this Recommendation . 3 4 Abbreviations and acronyms 5 5 Conventions 8 6 Overview and requirements 8 6.1 Overview 8 6.2 High-level requirements . 9 7 RACF mechanisms and scenarios 11 7.1 QoS resource control mechanisms and scenarios . 11 7.2 NAPT control and NAT traversal mechanisms and sc
22、enarios . 16 7.3 Resource control for unicast and multicast processes 17 7.4 Resource control for QoS downgrading . 20 7.5 Inter-operator communications 21 7.6 Resource control mechanisms and scenarios for RACF and MPM interactions . 26 7.7 Resource control cooperation between the RACF and RACF-like
23、 resource control functions 26 8 Functional architecture . 27 8.1 Overview 28 8.2 Functional entity descriptions . 30 8.3 Mechanisms 37 9 Reference points . 38 9.1 Reference point Rs . 38 9.2 Reference point Rw 50 9.3 Reference point Rc . 64 9.4 Reference point Ru . 66 9.5 Reference point Rt 71 9.6
24、Reference point Rp . 84 9.7 Reference point Ri 95 9.8 Reference point Rd . 107 9.9 Reference point Rn . 119 9.10 Reference point Rh . 119 9.11 Reference point Rm 129 9.12 Reference point Ro . 131 9.13 Reference point Rh 134 iv Rec. ITU-T Y.2111 (11/2011) Page 9.14 Domain scope of the reference point
25、s 134 10 Procedures 134 10.1 Procedures for QoS control 135 10.2 Procedures for NAPT control and NAT traversal 152 11 Security considerations and requirements 155 11.1 Overview of threats and potential attacks 155 11.2 Security requirements . 156 Annex A Resource control mechanisms and scenarios for
26、 RACF and MPM communication . 158 Annex B RACF enhancement for supporting policy-based charging control 161 B.1 Overview of enhancements 161 B.2 Functional architecture . 162 B.3 Functional architecture . 163 Appendix I Examples of the implementation of the RACF architecture 164 Appendix II TRC-FE o
27、ver different transport technologies . 166 II.1 The TRC-FE over an IP network 166 II.2 The TRC-FE over an MPLS network . 166 II.3 The TRC-FE over an Ethernet network 166 II.4 The TRC-FE over a broadband wireless network 167 Appendix III Example of methods for detecting and determining resource avail
28、ability in the TRC-FE . 168 Appendix IV Examples of admission control procedures for unicast and multicast 169 IV.1 Examples of admission control procedures for unicast and multicast . 169 IV.2 Example of multicast resource control scenario . 175 Appendix V The consideration of the CPN gateway contr
29、ol mode 177 V.1 The architecture for CPN gateway control . 177 V.2 The procedure of the CPN gateway control mode . 178 V.3 Example of the implementation of the RACF for CPN gateways 179 V.4 CPN gateway control in wholesale mode . 180 Appendix VI Resource control deployment scenarios for multicast 18
30、2 Appendix VII Inter-operator RACF communication scenarios for end-to-end QoS control involving nomadicity 184 Appendix VIII Comparison between reference point Rw and Rh 186 Appendix IX An example of an approach supporting time-shifted TV 187 Appendix X Performance notification between the RACF and
31、the MPM . 189 X.1 Communication of multiple MPM functions . 189 X.2 The comparison of the specifications of the reference points between the Rc and the Rm in the RACF . 191 X.3 Use cases based on RACF-MPM communication . 191 Rec. ITU-T Y.2111 (11/2011) v Page Appendix XI Interaction examples between
32、 the RACF and the PCC 194 Appendix XII Example admission control for IPTV service by invitation 200 Bibliography. 202 Rec. ITU-T Y.2111 (11/2011) 1 Recommendation ITU-T Y.2111 Resource and admission control functions in next generation networks 1 Scope This Recommendation specifies the resource and
33、admission control functions (RACF) in support of end-to-end quality of service (QoS) and network border control (at access-core and inter-domain boundaries) in next generation networks (NGNs). The RACF is aimed at providing real-time application-driven and policy-based transport resource management
34、for a wide range of services and for a variety of transport technologies (e.g., fixed or mobile). Services can make use of RACF whether the IP multimedia subsystem (IMS) is involved or not. This Recommendation defines the related requirements and functional architecture covering aspects such as reso
35、urce reservation, admission control and gate control, network address port translation (NAPT) and firewall control, and network address translator (NAT) traversal. This Recommendation defines the related requirements and functional architecture covering aspects such as interactions with 3GPP policy
36、control functionalities, resource and admission control between NGNs and RACF-unaware IP networks, wholesale, time-shifted TV services, QoS downgrading, mobility, resource and admission control based on user subscription profile, support of deep packet inspection (DPI), communication between RACF an
37、d management of performance measurement (MPM), policy-based charging control, and IPTV service by invitation. It also defines the reference points between different functional entities and the pertinent stage 2 requirements and describes the procedures for QoS-related transport resource control, NAP
38、T control, NAT traversal, inter-operator communication including other NGN and non-NGN providers, mobility support, performance measurement support, and policy-based charging control support. The pertinent protocol specifications are described in separate Recommendations. End-to-end information flow
39、s for representative applications, such as VoIP, bulk data transfer and video on demand, are for further study. Note that network management functionality is outside the scope of this Recommendation. Administrations may require operators and service providers to take into account national regulatory
40、 and national policy requirements in implementing this Recommendation. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were
41、 valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendat
42、ions is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Y.1291 Recommendation ITU-T Y.1291 (2004), An architectural framework for support of Quality of Service in packet networks. ITU-T Y.2
43、001 Recommendation ITU-T Y.2001 (2004), General overview of NGN. ITU-T Y.2011 Recommendation ITU-T Y.2011 (2004), General principles and general reference model for Next Generation Networks. ITU-T Y.2012 Recommendation ITU-T Y.2012 (2010), Functional requirements and architecture of next generation
44、networks. 2 Rec. ITU-T Y.2111 (11/2011) ITU-T Y.2014 Recommendation ITU-T Y.2014 (2010), Network attachment control functions in next generation networks. ITU-T Y.2018 Recommendation ITU-T Y.2018 (2009), Mobility management and control framework and architecture within the NGN transport stratum. ITU
45、-T Y.2173 Recommendation ITU-T Y.2173 (2008), Management of performance measurement for NGN. ITU-T Y.2233 Recommendation ITU-T Y.2233 (2010), Requirements and framework allowing accounting and charging capabilities in NGN. ETSI TS 123 203 ETSI TS 123 203 Ver. 10.4.0 (2011), Digital cellular telecomm
46、unications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Policy and charging control architecture. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 accounting ITU-T Y.2233: The process of collecting and analy
47、sing NGN service and NGN resource usage metrics for the purposes of capacity and trend analysis, cost allocation, auditing, and billing, etc. Accounting management requires that resource consumption be measured, rated, assigned, and communicated between appropriate business entities. 3.1.2 billing I
48、TU-T Y.2233: The process after rating in which the NGN transactions of NGN event usage are compiled and bills are produced. 3.1.3 chargeable event ITU-T Y.2233: Activity utilizing NGN network resources and related services for: user-to-user communication (e.g., a single call, a data communication se
49、ssion or a short message); or user-to-network communication (e.g., service profile administration); or inter-network communication (e.g., transferring calls, signalling, or short messages); or mobility (e.g., roaming or inter-system handover); and any other types of service activities the network operator may want to charge for. As a minimum, a chargeable event characterizes the resource/service usage and indicates the identity of the involved end user(s). 3
