1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T Y.2321 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/2016) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS, INTERNET OF THINGS AND SMART CITIES Next Generation Netwo
2、rks Enhancements to NGN Functional architecture for supporting virtualization of control network entities in next generation network evolution Recommendation ITU-T Y.2321 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS, INTERNE
3、T OF THINGS AND SMART CITIES GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security
4、Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y
5、.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 IPTV over NGN Y.1900Y.1999 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilit
6、ies and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Enhancements to NGN Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Packet-based Networks Y.2600Y.2699 Security Y.2700Y.2799
7、Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 FUTURE NETWORKS Y.3000Y.3499 CLOUD COMPUTING Y.3500Y.3999 INTERNET OF THINGS AND SMART CITIES AND COMMUNITIES General Y.4000Y.4049 Definitions and terminologies Y.4050Y.4099 Requirements and use cases Y.4100Y.4249 Infrastr
8、ucture, connectivity and networks Y.4250Y.4399 Frameworks, architectures and protocols Y.4400Y.4549 Services, applications, computation and data processing Y.4550Y.4699 Management, control and performance Y.4700Y.4799 Identification and security Y.4800Y.4899 Evaluation and assessment Y.4900Y.4999 Fo
9、r further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Y.2321 (09/2016) i Recommendation ITU-T Y.2321 Functional architecture for supporting virtualization of control network entities in next generation network evolution Summary Recommendation ITU-T Y.2321 introduces virtua
10、lization technology into next generation networks (NGNs), especially control functions. It also describes the functional architecture, functional entities (FEs), reference points and information flow to support virtualization of the control network entities (VCN) for NGN evolution. The architecture
11、design fulfils the requirements proposed in Recommendation ITU-T Y.2320. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Y.2321 2016-09-29 13 11.1002/1000/13012 Keywords Network function virtualization, NGN, orchestration, resource management, VCN. * To access the Recommenda
12、tion, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/ 11830-en. ii Rec. ITU-T Y.2321 (09/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specia
13、lized 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 Recommendations on them wi
14、th 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. The approval of ITU-T Rec
15、ommendations 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 “Administration“ is used for
16、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 compliance with the Recom
17、mendation 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 Recommendation is required of any pa
18、rty. INTELLECTUAL PROPERTY RIGHTSITU 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 claimed Intellectual Property R
19、ights, 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 Recommendation. However, implemen
20、ters 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 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written p
21、ermission of ITU. Rec. ITU-T Y.2321 (09/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 1 4 Abbreviations and acronyms 2 5 Conventions 2 6 Overview . 3 7 Functional architecture for supporting virt
22、ualization of control network entities in next generation network evolution . 3 7.1 Functional architecture . 3 7.2 Reference points . 7 8 Security considerations . 9 Annex A Information flows for virtualization of a control network . 10 A.1 On-boarding VCNE package 10 A.2 Delete VCNE package 10 A.3
23、 VCNE instantiation 11 A.4 Scale out of VCNE . 13 A.5 Scale in of VCNE . 14 A.6 Scaling of VCNE manually 14 A.7 Termination of VCNE 16 A.8 Network service instantiation flows . 16 A.9 Network service instance scale-out 17 A.10 Network service instance scale-in 18 A.11 Network service instance termin
24、ation flow 19 Rec. ITU-T Y.2321 (09/2016) 1 Recommendation ITU-T Y.2321 Functional architecture for supporting virtualization of control network entities in next generation network evolution 1 Scope This Recommendation describes the virtualization of control network entities (VCN) functional archite
25、cture that provides a virtualized running environment for next generation network (NGN) control functional entities, such as service control functions (SCFs) and content distribution functions (CDFs). The functional architecture of VCN for NGN evolution includes detailed capabilities of functions, f
26、unctional entities (FEs) and reference points. Annex A provides information flows for VCN. 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 edi
27、tions 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 of the Recommendations and other references listed below. A list of the currently val
28、id 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.2012 Recommendation ITU-T Y.2012 (2010), Functional requirements and architecture of next generation networks.
29、ITU-T Y.2320 Recommendation ITU-T Y.2320 (2015), Requirements for virtualization of control network entities in next generation network evolution. ITU-T Y.2701 Recommendation ITU-T Y.2701 (2007), Security requirements for NGN release 1. 3 Definitions 3.1 Terms defined elsewhere This Recommendation u
30、ses the following terms defined elsewhere: 3.1.1 live migration ITU-T Y.2320: The process of moving a running virtual machine (VM) between different physical machines without interrupting the operating system and applications in the virtual machine. 3.1.2 virtualized control network entity (VCNE) IT
31、U-T Y.2320: A control network entity deployed on virtualized infrastructure (i.e., across one or multiple virtual machines (VMs). 3.1.3 virtualized control network entity descriptor (VCNED) ITU-T Y.2320: A configuration template that describes a virtualized control network entity (VCNE) in terms of
32、its deployment and operational behaviour, and that is used in the management of the lifecycle of a VCNE instance. 3.1.4 virtual machine (VM) ITU-T Y.2320: The virtualized computation environment that behaves like a physical server. 3.2 Terms defined in this Recommendation None. 2 Rec. ITU-T Y.2321 (
33、09/2016) 4 Abbreviations and acronyms CDF Content Distribution Function CPU Central Processing Unit CPCI Compact Peripheral Component Interconnect FE Functional Entity IP Internet Protocol MF Management Function MMCF Mobility Management and Control Function NGN Next Generation Network NIC Network In
34、terface Card NS Network Service NSD Network Service Descriptor PNF Physical Network Function QoS Quality of Service SCF Service Control Function VCN Virtualization of Control Network entities VCNE Virtualized Control Network Entity VCNED Virtualized Control Network Entity Descriptor VCNM VCN Manager
35、 VI Virtualized Infrastructure VIM Virtualized Infrastructure Manager VLAN Virtual Local Area Network VLD Virtual Link Descriptor VM Virtual Machine 5 Conventions In this Recommendation: The phrase “is required to“ indicates a requirement that must be strictly followed and from which no deviation is
36、 permitted if conformance to this Recommendation is to be claimed. The phrase “is prohibited from“ indicates a prohibition that must be strictly followed and from which no deviation is permitted if conformance to this Recommendation is to be claimed. The phrase “is recommended“ indicates a requireme
37、nt that is recommended, but which is not absolutely required. Thus, this requirement need not be satisfied to claim conformance. The phrase “is not recommended“ indicates a requirement that is not recommended, but which is not specifically prohibited. Thus, conformance with this Recommendation can s
38、till be claimed even if this requirement is satisfied. The phrase “can optionally“ indicates an optional requirement that is permissible, without implying any sense of being recommended. This term is not intended to imply that the vendors implementation must provide the option and the feature can be
39、 optionally enabled by the network Rec. ITU-T Y.2321 (09/2016) 3 operator/service provider. Rather, it means the vendor may optionally provide the feature and still claim conformance with the Recommendation. 6 Overview The hardware of telecommunication networks is changing from dedicated compact per
40、ipheral component interconnect (CPCI) to general purpose servers and virtualization technology is being applied to telecommunication networks. These new trends bring great benefits, such as rapid deployment and updating, energy saving and hardware sharing. Traditionally, NGNs ITU-T Y.2012 have defin
41、ed architecture, capability of different functions/functional entities (FEs) and reference points between those functions/FEs. However, new trends affect the infrastructure in ways that are not specified in ITU-T Y.2012. Therefore, to achieve such benefits, NGN architecture needs to be improved to m
42、eet virtualization-related requirements ITU-T Y.2320, e.g., the way to manage and allocate a virtual resource or a physical resource needs to be designed. Accordingly, design related to virtualized infrastructure (VI) is becoming part of NGN network evolution. Figure 6-1 illustrates the relationship
43、 between NGN architecture and virtualization-related design. Figure 6-1 The relationship between next generation network architecture and virtualization-related design This Recommendation focuses on the design of the architecture related to virtualization of control network entities (VCN), including
44、 the VI, the management systems and the network entities. The reason for focusing on control network entities is that the performance degradation caused by virtualization has been proved acceptable by vendors and operators. Control functions in NGNs, such as SCFs, CDFs and mobility management and co
45、ntrol functions (MMCFs), can be supported in this architecture. Since the architecture design is not dedicated to specified network entities, this Recommendation could also apply to other kinds of network entities, such as gateways, if they are virtualized. 7 Functional architecture for supporting v
46、irtualization of control network entities in next generation network evolution This clause describes the functional architecture of VCN, FEs, and the reference points between the FEs. 7.1 Functional architecture The functional architecture of the VCN identifies the functions shown in Figure 7-1. 4 R
47、ec. ITU-T Y.2321 (09/2016) Virtualized infrastructure (VI) Virtualized infrastructure manager (VIM) VCN manager (VCNM) Virtualized Control Network Entity (VCNE) Orchestrator Management functions (MFs). Figure 7-1 Functional architecture for supporting VCN These functions are used to support the virt
48、ualization of NGN control functions, i.e., NGN control functions are virtualized and deployed on to general infrastructure including computing, storage and network resource, so that these functions can be flexibly created, updated and deleted ITU-T Y.2320. NGN control functions (e.g., SCFs, transpor
49、t control functions) are required to support the interface with the VCNM. The NGN MF needs to be enhanced to assist the virtualization of NGN control functions. VI provides the execution environment to the VCNE. VCNE software can run on a hardware independent resource from VI with specific performance and portability requirements. It does not assume any specific control protocol between VI and VCNE. Clause 7.1 describes the virtualized infrastructure, while clause 7.2 describes reference po
