1、 ETSI TS 182 019 V3.1.2 (2011-09) Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Content Delivery Network (CDN) Architecture Technical Specification ETSI ETSI TS 182 019 V3.1.2 (2011-09)2Reference RTS/TISPAN-02085-NGN-R3 Keywords CDN, IPTV ETSI 650
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6、e copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2011. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of
7、ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 182 019 V3.1.2 (2011-09)3Contents Intellectual Property Rights 6g3Foreword . 6g31 Scope 7g32 References 7g32.1 Normat
8、ive references . 7g32.2 Informative references 7g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 8g34 General description of CDN . 8g34.1 Functional roles and CDN relationships . 9g34.2 High level functional overview 10g34.3 Requirements 11g34.3.1 CDN Functional Requirem
9、ents . 11g34.3.2 Functional Requirements for interconnecting a CDN with an IPTV subsystem . 13g34.3.3 CDN non-functional requirements 13g35 Content Delivery Network (CDN) functional architecture 14g35.1 General description. 14g35.2 Functional entities 15g35.2.1 Content Delivery Network Controller Fu
10、nction (CDNCF). 15g35.2.2 Cluster Controller Function (CCF) . 16g35.2.3 Content Delivery Function (CDF) 17g35.2.4 Asset Location Function (ALF) 18g35.2.5 Content Origin Function (COF) 18g35.3 Overall architecture and reference points . 19g35.4 Relationship between IPTV subsystem and CDN 19g35.5 Inte
11、rconnection between two TISPAN CDNs within the same service provider domain 20g36 Reference points . 21g36.1 CDNCF - CCF (Ys) 21g36.2 CCF - CDF (Yp) . 21g36.3 CCF - UE (Xc) . 21g36.4 CDF - UE (Xc) 22g36.5 CDF - UE (Xd) 22g36.6 CDNCF - CDNCF (Yq) . 22g36.7 CDF-CDF (Cf) . 22g36.8 CDNCF - IPTV subsyste
12、m (Cu) . 22g36.8.1 CDNCF - IMS-based IPTV subsystem . 22g36.8.2 CDNCF - NGN integrated IPTV subsystem . 22g36.9 CDNCF - IPTV subsystem (Qc) . 22g36.10 CCF - IPTV subsystem (Ct) . 23g36.10.1 CCF - IMS-based IPTV subsystem . 23g36.10.2 CCF - NGN Integrated IPTV subsystem 23g36.11 CDNCF - ALF (Qq) . 23
13、g36.12 ALF - ALF (Qq) 23g36.13 ALF - CCF (Yy) . 23g36.14 ALF - COF (Yv) . 23g36.15 COF - CDF (Cf) . 23g36.16 COF - COF (Cf) 23g37 Procedures 24g37.1 Request routing within CDN 24g37.1.1 CDN request routing resolves to a CDF - content available . 24g37.1.2 CDN request routing resolves to a CDF - dyna
14、mic acquisition 25g3ETSI ETSI TS 182 019 V3.1.2 (2011-09)47.1.2.1 CDN request routing resolves to the CDF - early dynamic acquisition 25g37.1.2.2 CDN request routing resolves to CDF - late dynamic acquisition triggered by CCF 27g37.1.2.3 CDN request routing resolves to CDF - late dynamic acquisition
15、 triggered by CDF . 28g37.1.3 CDN request routing resolves to a redirect to a new CDNCF 29g37.1.4 CDN request routing resolves to a proxy of the original request to a new CDNCF . 30g37.1.5 CDN request routing for unicast content download 31g37.2 Request initiation: service approach - CDNCF sends IPT
16、V request to CCF 32g37.2.1 Service approach: common procedures 32g37.2.1.1 Unicast streaming session Initiation - service approach 32g37.2.1.2 Service approach: CDNCF query to ALF . 33g37.2.2 Service approach: additional procedures for IMS-based IPTV subsystem . 33g37.2.2.1 Unicast streaming session
17、 initiation (no session delivery established) . 33g37.2.2.2 UE initiated unicast streaming session modification for IMS based IPTV . 35g37.2.2.3 CDN initiated unicast streaming session modification for IMS based IPTV 37g37.2.2.4 SCF initiated unicast streaming session modification for IMS based IPTV
18、 . 38g37.2.2.5 Restricted (forced-playout policies) 38g37.2.3 Service approach: additional procedures for NGN integrated IPTV subsystem . 39g37.2.3.1 UE initiated unicast streaming session initiation - coupled mode . 39g37.3 Request initiation: query approach - CDNCF sends CCF address to IPTV . 40g3
19、7.3.1 Query approach: common procedures 40g37.3.1.1 Query approach: CDNCF (ALF) query. 40g37.3.1.2 Unicast streaming initiation - query approach. 41g37.3.1.3 Restricted (forced-playout) policies 41g37.4 Media control procedures . 42g37.4.1 Unicast streaming delivery - trick play commands - proxy via
20、 CCF 42g37.4.2 Unicast streaming delivery - trick play commands - direct to CDF 44g37.5 Upload/upstream generic procedures . 45g37.6 Generic download procedures 46g37.6.1 Unicast download/downstream common procedures 46g37.6.1.1 Unicast download delivery - redirect to CDF mode 46g37.6.1.2 Unicast do
21、wnload delivery - CCF proxy redirect mode 46g37.6.1.3 Unicast download delivery in CCF triangular proxy Mode 47g37.6.1.4 Unicast download delivery in redirect mode . 48g37.6.2 Unicast download/downstream session initiation for IMS based IPTV 49g37.6.3 Unicast download/downstream initiation for NGN i
22、ntegrated IPTV 51g37.7 Termination procedures 51g37.7.1 Generic termination procedures 51g37.7.1.1 UE-initiated termination 51g37.7.1.2 IPTV subsystem-initiated termination. 51g37.7.2 Additional termination procedures - query approach 52g37.7.2.1 CCF initiated termination - query approach 52g37.7.2.
23、2 CDF initiated termination - query approach 53g37.7.3 Additional termination procedures - service approach - IMS-based subsystem . 53g37.7.3.1 CCF initiated session termination - IMS-based service approach . 53g37.7.3.2 CDF initiated session termination - IMS-based service approach. 54g37.7.3.3 UE
24、initiated session termination (IMS-based service approach - CCF proxy mode) 55g37.7.3.4 SCF initiated session termination - IMS-based service approach . 55g37.8 Content management procedures within CDN . 56g37.8.1 Content ingestion Procedures . 56g37.8.1.1 Procedures for pre-positioning 56g37.8.1.2
25、Procedures for dynamic acquisition 57g37.8.2 Content deployment procedures . 57g37.8.2.1 Receiver driven pre-positioned content deployment . 57g37.8.2.2 Sender driven pre-positioned content deployment 58g37.9 Content replication within the CDN . 60g37.9.1 Duplication of content copy within cluster .
26、 60g37.9.2 Duplication between two clusters under the same CDNCF 61g37.9.3 Duplication between two clusters under different CDNCFs . 62g37.9.4 Media Relay based unicast streaming delivery for IMS based IPTV . 63g37.9.4.1 Content deployment Essential, or potentially Essential, IPRs notified to ETSI i
27、n respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence
28、 of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Telecommunications and Internet converged Services
29、 and Protocols for Advanced Networking (TISPAN). ETSI ETSI TS 182 019 V3.1.2 (2011-09)71 Scope The present document describes the Content Delivery Network (CDN) functional architecture, the interconnection with IMS-based and NGN Integrated IPTV solutions and user-related procedures in relationship w
30、ith the unicast stored (e.g. content download) and streaming (e.g. CoD) services as defined in TS 181 016 1. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applie
31、s. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this c
32、lause were valid at the time of publication, ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. 1 ETSI TS 181 016: “Telecommunications and Internet converged Services and Protocols for
33、 Advanced Networking (TISPAN); Service Layer Requirements to integrate NGN services and IPTV“. 2 ETSI TS 182 027: “Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); IPTV Architecture; IPTV functions supported by the IMS subsystem“. 3 ETSI TS 182 028:
34、“Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN integrated IPTV subsystem Architecture“. 4 ETSI TS 187 003: “Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Security; Security Architecture“
35、. 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 ETSI TS 102 990: “Media Content Distribution (MCD); CDN Interconnection, use cases and requirements“. 3
36、 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: consumer: entity where the content is consumed content acquisition: act of acquiring content from a content source content delivery: act of delivering deployed content
37、to a user ETSI ETSI TS 182 019 V3.1.2 (2011-09)8Content Delivery Network (CDN): set of functions managing content acquired from content sources, through delivery to the user content deployment: act of replicating and/or moving ingested content to one or more network entities, based on content deploy
38、ment policies content distribution: act of moving content within or between networks content ingestion: act of preparing and introducing acquired content (and associated data) for the first time to an initial server location content publishing: act of making the content available for access content
39、provider: entity that owns or is licensed to sell content or content assets pull: within the CDN, a content delivery method in which the requesting entity initiates the media flow by requesting content from the providing entity push: within the CDN, a content delivery method in which the providing e
40、ntity initiates the media flow to the requesting destination entity 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ALF Asset Location Function CCF Cluster Controller Function C-COF Control plane COF CDF Content Delivery Function CDN Content Delivery Ne
41、twork CDNCF Content Delivery Network Control Function CoD Content on Demand COF Content Origin Function D-COF Data plane COF FE Functional ElementFEC Forward Error Correction IMS IP Multimedia Subsystem IPTV Internet Protocol TeleVision LRU Least Recently Used MCF Media Control Function MDF Media De
42、livery Function MF Media Function NASS Network Attachment Sub-System NAT Network Address Translation NGN Next Generation Network QoS Quality of Service RTP Real Time Protocol SCF Service Control Function SSF Service Selection Function TV TeleVision UDP User Datagram Protocol UE User Equipment UGC Us
43、er Generated Content 4 General description of CDN A Content Delivery Network (CDN) is a collaborative collection of components, where content is replicated over several mirrored servers in order to perform transparent and effective delivery of content to end users. ETSI ETSI TS 182 019 V3.1.2 (2011-
44、09)9The major stages of CDN are: Content acquisition: Acquiring content from a content source, including: - Pre-Positioning: content acquisition triggered prior to actual corresponding content request by users. - Dynamic Acquisition: content acquisition triggered at the time it is requested by users
45、. Content ingestion: Preparing and introducing acquired content (and associated data) for the first time to an initial server location. Content deployment: Replicating and/or moving ingested content to one or more network entities, based on content deployment policies. The CDN model for distributing
46、 content is based on replicated servers located at the edge of the network (to which end users are connected) for delivering content to end users in a reliable and timely manner. The content can be replicated in advance or on-demand. The CDN goals are: Scalability: the ability to expand, in order to
47、 handle new amount of data and requests. Performance: response time, or latency, that end users perceive. Reliability: makes the service always available. Security: prevent unauthorized access and modification of the content. The CDN functional architecture defined in the present document is indepen
48、dent of the service system. The CDN is transparent to media formats, content protection (whether the content is encrypted or not, or which content protection solution is implemented) and the service types. While the CDN is specified herein in the context of IPTV, it may be utilized where appropriate
49、 for other services. NOTE: CDN Interconnection between different service provider domains is addressed in annex D and TS 102 990 i.1. 4.1 Functional roles and CDN relationships The present document describes the TISPAN CDN architecture, the interconnection of CDNs in the user-facing service delivery network, including the interfacing with IPTV subsystems defined in TS 182 027 2 and TS 182 028 3, and CDN content ingestion. For the purpose of the present document, concepts of domains, and roles are defined in this clause and are illustrat
