1、 International Telecommunication Union ITU-T Y.1911TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (04/2010) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects IPTV over NGN IPTV services and nomadism: Scenarios and functiona
2、l architecture for unicast delivery Recommendation ITU-T Y.1911 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 aspec
3、ts 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, n
4、etwork 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.1999NEXT GENERA
5、TION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Numbering, naming and ad
6、dressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Future networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 For further details, please refer to the list of ITU-T Recom
7、mendations. Rec. ITU-T Y.1911 (04/2010) i Recommendation ITU-T Y.1911 IPTV services and nomadism: Scenarios and functional architecture for unicast delivery Summary Recommendation ITU-T Y.1911 describes scenarios and functional architecture aspects related to the support of IPTV services in conjunct
8、ion with nomadism. Recommendation ITU-T Y.1911 addresses IPTV services supported via the use of unicast delivery. History Edition Recommendation Approval Study Group 1.0 ITU-T Y.1911 2010-04-30 13 Keywords IPTV, nomadism, roaming, unicast delivery. ii Rec. ITU-T Y.1911 (04/2010) FOREWORD The Interna
9、tional 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-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, oper
10、ating 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 years, establishes the topics for study by the ITU-T study groups which, in turn, p
11、roduce 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 necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In
12、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. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g.,
13、 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 equivalents are used to express requirements. The use of such words does not sugg
14、est 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 of a claimed Intellectual Property Right. ITU takes no position concerning the evid
15、ence, 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, ITU had not received notice of intellectual property, protected by patents, which m
16、ay 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.int/ITU-T/ipr/. ITU 2010 All rights reserved. No part of this publication may b
17、e reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Y.1911 (04/2010) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 4 Abbreviations and acronyms 3 5 Conventions 3 6 General description . 3 6.1 Introduction 3 6.2 As
18、sumptions . 4 6.3 Non-roaming scenario 4 6.4 Roaming scenarios 5 7 Architectural overview . 8 7.1 Roaming with compatible SCFs between NGNs . 8 7.2 Roaming with incompatible SCFs between NGNs 9 8 Functional architecture . 10 8.1 Detailed functional architecture for network functions 10 8.2 Reference
19、 points . 11 9 Security considerations . 12 Appendix I Information flows . 13 I.1 Roaming with compatible SCFs between NGNs . 13 I.2 Roaming with incompatible SCFs between NGNs 15 Rec. ITU-T Y.1911 (04/2010) 1 Recommendation ITU-T Y.1911 IPTV services and nomadism: Scenarios and functional architect
20、ure for unicast delivery 1 Scope This Recommendation describes: Scenarios for the support of IPTV services to nomadic end users taking into account the requirements identified in ITU-T Y.1901 and the functional architecture defined in ITU-T Y.1910. These scenarios are established based upon assumpti
21、ons which are provided in this Recommendation; Functional architectures, reference points and information flows based on the scenarios identified in this Recommendation. Scope of this Recommendation is limited to the IPTV services provided through unicast delivery. The IPTV services provided through
22、 multicast delivery are out of scope of this Recommendation. The use of this Recommendation requires contractual agreements among involved parties, e.g., end user, service provider, network provider and content provider, whose description is beyond the scope of this Recommendation. 2 References The
23、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 valid. All Recommendations and other references are subject to revision; users of this
24、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 Recommendations is regularly published. The reference to a document within this Recommendation does
25、 not give it, as a stand-alone document, the status of a Recommendation. ITU-T H.235.0 Recommendation ITU-T H.235.0 (2005), H.323 security: Framework for security in H-series (H.323 and other H.245-based) multimedia systems. ITU-T H.324 Recommendation ITU-T H.324 (2009), Terminal for low bit-rate mu
26、ltimedia communication. ITU-T H.770 Recommendation ITU-T H.770 (2009), Mechanisms for service discovery and selection for IPTV services. ITU-T Q.9 Recommendation ITU-T Q.9 (1988), Vocabulary of switching and signalling terms. ITU-T Q.1706 Recommendation ITU-T Q.1706/Y.2801 (2006), Mobility managemen
27、t requirements for NGN. ITU-T Q.3401 Recommendation ITU-T Q.3401 (2007), NGN NNI signalling profile (protocol Set 1). ITU-T X.1191 Recommendation ITU-T X.1191 (2009), Functional requirements and architecture for IPTV security aspects. ITU-T Y.1401 Recommendation ITU-T Y.1401 (2008), Principles of in
28、terworking. ITU-T Y.1901 Recommendation ITU-T Y.1901 (2009), Requirements for the support of IPTV services. 2 Rec. ITU-T Y.1911 (04/2010) ITU-T Y.1910 Recommendation ITU-T Y.1910 (2008), IPTV functional architecture. ITU-T Y.2012 Recommendation ITU-T Y.2012 (2010), Functional requirements and archit
29、ecture of the next generation networks. ITU-T Y.2014 Recommendation ITU-T Y.2014 (2010), Network attachment control functions in next generation networks. ITU-T Y.2111 Recommendation ITU-T Y.2111 (2008), Resource and admission control functions in next generation networks. ITU-T Y.2701 Recommendatio
30、n ITU-T Y.2701 (2007), Security requirements for NGN release 1. ITU-T Y.2702 Recommendation ITU-T Y.2702 (2008), Authentication and authorization requirements for NGN release 1. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 functional
31、 architecture ITU-T Y.2012: A set of functional entities and the reference points between them used to describe the structure of an NGN. These functional entities are separated by reference points, and thus, they define the distribution of functions. 3.1.2 home network ITU-T Q.1706: The network to w
32、hich a mobile user is normally connected, or the service provider with which the mobile user is associated, and where the users subscription information is managed. 3.1.3 interworking ITU-T Y.1401: The term “interworking“ is used to express interactions between networks, between end systems, or betw
33、een parts thereof, with the aim of providing a functional entity capable of supporting an end-to-end communication. 3.1.4 media ITU-T H.324: One or more of audio, video or data. 3.1.5 media stream ITU-T H.235.0: A media stream can consist of audio, video, or data, or a combination of any of them. Me
34、dia stream data conveys user or application data (i.e., a payload) but no control data. 3.1.6 nomadism ITU-T Q.1706: The ability of the user to change their network access point. When changing the network access point, the users service session is completely stopped and then started again, i.e., the
35、re is no service continuity or hand-over used. It is assumed that normal usage pattern is that users shut down their service session before attaching to a different access point. 3.1.7 personal mobility ITU-T Q.1706: This is the mobility for those scenarios where the user changes the terminal used f
36、or network access at different locations. The ability of a user to access telecommunication services at any terminal on the basis of a personal identifier, and the capability of the network to provide those services delineated in the users service profile. 3.1.8 reference point ITU-T Y.2012: A conce
37、ptual point at the conjunction of two non-overlapping functional entities that can be used to identify the type of information passing between these functional entities. 3.1.9 roaming ITU-T Q.1706: This is the ability of users to access services according to their user profile while outside of their
38、 subscribed home network, i.e., by using an access point of a visited network. NOTE This requires the capability for access to the visited network, the existence of an interface between home network and visited network, as well as a roaming agreement between the respective network operators. Rec. IT
39、U-T Y.1911 (04/2010) 3 3.1.10 signalling message ITU-T Q.9: An assembly of signalling information pertaining to a call, management transaction, etc., comprising also elements for delimitation, sequencing and error control, that is transferred as an entity. 3.1.11 terminal mobility ITU-T Q.1706: This
40、 is the mobility for those scenarios where the same terminal equipment is moving or is used at different locations. The ability of a terminal to access telecommunication services from different locations and while in motion, and the capability of the network to identify and locate that terminal. 3.1
41、.12 visited network ITU-T Q.1706: The network outside a home network that provides service to a mobile user. This term is more business significant than geographically significant. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AAA Authentication, Aut
42、horization and Accounting IMS IP Multimedia Subsystem IP Internet Protocol IPTV IP Television ITF IPTV Terminal Functions NACF Network Attachment Control Functions NGN Next Generation Network RACF Resource and Admission Control Functions RTP Real Time Protocol RTSP Real Time Streaming Protocol SCF S
43、ervice Control Functions SCP Service and Content Protection SIP Session Initiation Protocol TV Television VoD Video on Demand 5 Conventions The terms “home network“ and “visited network“ used in this Recommendation are based on the context of mobile (e.g., cellular) networks or networks supporting n
44、omadism. These terms are not to be confused with the use of the term “home network“ as used in the context of residential (home) networks. 6 General description 6.1 Introduction Figure 6-1 depicts interworking between IPTV functional architectures as specified in ITU-T Y.1910. 4 Rec. ITU-T Y.1911 (0
45、4/2010) Figure 6-1 Interworking between IPTV functional architectures As shown in Figure 6-1, interworking between IPTV functional architectures 1 and 2 is achieved by means of interworking functions. Details of the interworking functions, such as media transcoding, are out of scope of this Recommen
46、dation given that interworking functions can be carried out at one or more layers, and depend on the specifics of the provided IPTV services. 6.2 Assumptions Assumptions made in this Recommendation are as follows: IPTV functional architectures shown in Figure 6-1 are NGN-based IPTV architectures as
47、per ITU-T Y.1910; IPTV functional architectures shown in Figure 6-1 are either “NGN IMS-based IPTV functional architectures“ or “NGN-based non-IMS IPTV functional architectures“; Interworking between IPTV functional architectures 1 and 2 is limited to IPTV services (e.g., VoD) using unicast delivery
48、; Interworking between IPTV functional architectures 1 and 2 is achieved between their respective network functions. The service control functions (SCF) of IPTV functional architectures 1 and 2 may be used for interworking as well. Interworking between content delivery functions of IPTV functional a
49、rchitectures 1 and 2 is out of scope of this Recommendation; IPTV functional architectures 1 and 2 are described as either home network or “visited network“, when dealing with roaming cases; Content is always delivered from the home network. 6.3 Non-roaming scenario This clause describes the non-roaming scenario where an NGN operator provides its own nomadic end users with IPTV services. Figure 6-2 shows the non-roaming scenario where the end user is attache
