ITU-T Q 3300-2008 Architectural framework for the Q 33xx series of Recommendations (Study Group 11)《Q 33xx系列推荐性规范的架构框架 11号研究组》.pdf

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1、 International Telecommunication Union ITU-T Q.3300TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2008) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements and protocols for the NGN Resource control protocols Architectural framework for the Q.33xx series of Recommendations Recommendation

2、 ITU-T Q.3300 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q

3、.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE

4、 NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNA

5、LLING REQUIREMENTS AND PROTOCOLS FOR THE NGN Q.3000Q.3999 General Q.3000Q.3029 Network signalling and control functional architecture Q.3030Q.3099 Network data organization within the NGN Q.3100Q.3129 Bearer control signalling Q.3130Q.3179 Signalling and control requirements and protocols to support

6、 attachment in NGN environments Q.3200Q.3249 Resource control protocols Q.3300Q.3369 Service and session control protocols Q.3400Q.3499 Service and session control protocols supplementary services Q.3600Q.3649 NGN applications Q.3700Q.3849 Testing for NGN networks Q.3900Q.3999 For further details, p

7、lease refer to the list of ITU-T Recommendations. Rec. ITU-T Q.3300 (01/2008) i Recommendation ITU-T Q.3300 Architectural framework for the Q.33xx series of Recommendations Summary Recommendation ITU-T Q.3300 provides a framework by means of which the reader may understand the relationships between

8、the various Recommendations of the Q.33xx series. It defines the entities involved in resource control signalling and the interfaces across which this signalling takes place. Appendix I provides a cross-reference between the interfaces defined in the main body of this Recommendation and the Recommen

9、dations defining the protocols operating across those interfaces. Source Recommendation ITU-T Q.3300 was approved on 23 January 2008 by ITU-T Study Group 11 (2005-2008) under Recommendation ITU-T A.8 procedure. ii Rec. ITU-T Q.3300 (01/2008) FOREWORD The International Telecommunication Union (ITU) i

10、s the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing

11、 Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics

12、. 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 necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “A

13、dministration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g., interoperability or applicability) and

14、 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 equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommenda

15、tion 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 of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of clai

16、med 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, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recomm

17、endation. 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.int/ITU-T/ipr/. ITU 2008 All rights reserved. No part of this publication may be reproduced, by any means whatsoever,

18、without the prior written permission of ITU. Rec. ITU-T Q.3300 (01/2008) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 1 4 Abbreviations 2 5 Conventions 2 6 Architectural specification 2 6.1 The Y.2111 functional architecture 2 6.2 Principles of mapping. 3 6.3 Implementations of function

19、al entities . 3 6.4 Interfaces and protocols 4 Appendix I Tabulation of resource control protocol Recommendations 5 Bibliography. 6 Rec. ITU-T Q.3300 (01/2008) 1 Recommendation ITU-T Q.3300 Architectural framework for the Q.33xx series of Recommendations 1 Scope This Recommendation specifies a concr

20、ete realization of the functional architecture defined in ITU-T Y.2111, including the specification of the physical entities involved in resource control signalling, the interfaces across which signalling takes place, and the mapping between these entities and interfaces and the corresponding functi

21、onal entities and reference points in ITU-T Y.2111. Appendix I provides a further mapping between the interfaces and the protocol specifications which realize those interfaces. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this t

22、ext, constitute provisions of this Recommendation. At the time of publication, the editions indicated were 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

23、 of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations 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.2111 Recommendation ITU-T

24、 Y.2111 (2006), Resource and admission control functions in Next Generation Networks. 3 Definitions This Recommendation defines the following terms: 3.1 policy decision physical entity (PD-PE): A device that implements the policy decision functional entity (PD-FE) as defined in clause 7.2.3.2 of ITU

25、-T Y.2111. 3.2 transport resource control physical entity (TRC-PE): A device that implements the transport resource control functional entity (TRC-FE) as defined in clause 7.2.3.3 of ITU-T Y.2111. 3.3 policy enforcement physical entity (PE-PE): A device that implements the policy enforcement functio

26、nal entity (PE-FE) as defined in clause 7.2.4.1 of ITU-T Y.2111. NOTE One example of such a device is a border router. 3.4 transport resource enforcement physical entity (TRE-PE): A device that implements the transport resource enforcement functional entity (TRC-FE) as defined in clause 7.2.4.2 of I

27、TU-T Y.2111. 3.5 network attachment control entity (NACE): A general term used to refer to a device exercising one of the network attachment control functions (NACF) as defined in clause 7.2.2 of ITU-T Y.2111. NOTE These functions may be distributed over multiple devices, but identification of speci

28、fic devices is unnecessary so long as the necessary information flows are supported over the Ru interface. 3.6 transport physical entity (T-PE): A term used to refer to any device implementing the transport functions in the limited sense provided in clause 7.2.4 of ITU-T Y.2111 (i.e., those with whi

29、ch the RACF interacts). 2 Rec. ITU-T Q.3300 (01/2008) 4 Abbreviations This Recommendation uses the following abbreviations: FE Functional Entity NACE Network Attachment Control Entity NACF Network Attachment Control Function PE Physical Entity PD Policy Decision (Functional or Physical Entity) PE Po

30、licy Enforcement (Functional or Physical Entity) RACF Resource Admission and Control Function SCE Service Control Entity (e.g., implementation of a P-CSCF) SCF Service Control Functions (in the sense used in ITU-T Y.2111) TF Transport Functions (in the sense used in ITU-T Y.2111) T-PE Transport Phys

31、ical Entity (e.g., a router) TRC Transport Resource Control (Functional or Physical Entity) 5 Conventions None. 6 Architectural specification 6.1 The Y.2111 functional architecture Figure 1 illustrates the RACF functional architecture defined in ITU-T Y.2111. RACFTRC-FEPD-FERtRdRpRsRiRwRn RcTRE-FE P

32、E-FETransport functionsTransport stratumService stratumNetwork attachmentcontrol functionsOtherNGNsService control functionsRuTaken from Figure 5 of ITU-T Y.2111. Figure 1 RACF functional architecture The relevant functional entities are: the service control functions; the network attachment control

33、 functions; Rec. ITU-T Q.3300 (01/2008) 3 the policy decision functional entity (PD-FE) within the resource and admission control functions (RACF); the transport resource control functional entity (TRC-FE) within the RACF; the transport functions, which contain: the policy enforcement functional ent

34、ity (PE-FE); the transport resource enforcement functional entity (TRE-FE) (for further study); other functions. 6.2 Principles of mapping The realization presented in this Recommendation accepts the considerations of scalability and domain independence that motivated the development of the function

35、al architecture. As a result, it maps each functional entity of the functional architecture to a separate type of physical entity. Furthermore, each reference point is assumed to map to a separate interface. At a particular interface one protocol, from a set of recommended protocols, may be used. Be

36、cause the mapping between reference points and interfaces is one-to-one, each interface is named after the reference point to which it corresponds (e.g., Rs interface corresponding to the Rs reference point). Depending on the technology involved, it may well be that some of the physical entities ide

37、ntified in this Recommendation are combined. In such a case, each combined entity will support the combined set of external interfaces of its component elements. Note that interfaces that would lie between the component elements if they were separate are absorbed into the interior of the combined en

38、tity. 6.3 Implementations of functional entities Table 1 indicates the mapping from the functional entities to the physical entities implementing them. Table 1 Mapping from functional to physical entities concerned with resource admission and control Functional entity Abbrev. Physical entity Abbrev.

39、 Service control functions SCF Service control entity (e.g., implementation of P-CSCF) SCE Network attachment control functions NACF Network attachment control entity NACE Policy decision functional entity PD-FE Policy decision physical entity PD-PE Transport resource control functional entity TRC-F

40、E Transport resource control physical entity TRC-PE Transport resource enforcement functional entity TRE-FE Transport resource enforcement physical entity TRE-PE Transport functions in general TF Transport physical entity (of various types, possibly limited by context) T-PE Policy enforcement functi

41、onal entity PE-FE Policy enforcement physical entity PE-PE Clause 7.1 of ITU-T Y.2111 implies a number of relationships between the physical entities named in Table 1. These relationships are listed here and illustrated in Figure 2 below: One PD-PE may serve SCE belonging to multiple service stratum

42、 service providers (where each SCE is individually owned by a particular service provider). Multiple PD-PEs within the same domain may be interconnected via the Rd interface. 4 Rec. ITU-T Q.3300 (01/2008) One PD-PE can communicate directly with one or several TRC-PEs belonging to the same network op

43、erators domain, and a TRC-PE may communicate directly with multiple PD-PEs. A mode of operation is possible, whereby for a specific request for the allocation of QoS resources, the PD-PE contacts a single TRC-PE. That TRC-PE then communicates to other TRC-PE via the Rp interface as required to fulfi

44、l the request. Figure 2 shows an example configuration of the physical entities identified in Table 1 and the interfaces between them. The actual configuration may vary according to the needs of the network operators concerned. PE-PE T-PETRC-PET-PE PE-PETRC-PETRC-PETRE-PERcRc RcRcRnRc.RtPD-PE PD-PER

45、tRi Rd RiNetwork domain XRw RwSC-PE SC-PESC-PEService provider A Service provider BRs Rs RsRsPD-PEPE-PETRC-PENetwork domain YRp RpRtRwRcPD-PEPE-PETRC-PEAccess networkRtRwRcNAC-PERuRsThe heavy dashed lines denote packet flows.NOTE The Rn interface is for further study.Figure 2 Example physical realiz

46、ation of the RACF architecture 6.4 Interfaces and protocols Appendix I provides a cross-reference between the interfaces defined in this Recommendation, the protocols used at those interfaces, and the Recommendations within which those protocols are documented. Rec. ITU-T Q.3300 (01/2008) 5 Appendix

47、 I Tabulation of resource control protocol Recommendations (This appendix does not form an integral part of this Recommendation) Table I.1 lists the protocol Recommendations applicable to each resource control interface specified in the body of this Recommendation. Table I.1 Resource control protoco

48、l Recommendations Interface Supporting entities Protocol base (Note) Rec. No. Rs SC-PE, PD-PE Diameter b-ITU-T Q.3301.1 Rp Between TRC-PE RCIP b-ITU-T Q.3302.1 Introduction b-ITU-T Q.3303.0COPS-PR b-ITU-T Q.3303.1 H.248 b-ITU-T Q.3303.2Rw PD-PE, PE-PE Diameter b-ITU-T Q.3303.3 COPS-PR b-ITU-T Q.3304

49、.1Rc TRC-PE, T-PE SNMP b-ITU-T Q.3304.2 Rt PD-PE, TRC-PE Diameter b-ITU-T Q.3305.1 Rd PD-PE to PD-PE (intra-domain) To be selected Q.3306.x Ri PD-PE to PD-PE (inter-domain) To be selected Q.3307.x Rn TRC-PE, TRE-PE Interface is for further study - NOTE 1 Diameter: b-IETF RFC 3588. NOTE 2 COPS-PR: Common open policy service Policy provisioning (b-IETF RFC 2748 and b-IETF RFC 3084). NOTE 3 SNMP: Simple network management protocol (b-IETF RFC 3410 and many othe