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INTERNATIONAL TELECOMMUNICATION UNION FOCUS GROUP ON IPTV TELECOMMUNICATION STANDARDIZATION SECTOR FG IPTV-C-0158 English only STUDY PERIOD 2005-2008 2nd FG IPTV meeting: Busan, 16-20 October 2006 WG(s): 4 CONTRIBUTION Source: ZTE Corporation Title: The network control requirements for content distribution aspects 1. Abstract This proposal provides some requirements on the areas of IPTV service content delivery, and suggests using both CDN and streaming technique to construct IPTV service content delivery network. 2. Discussion In order to meet the demand of large scale IPTV services, providing plenty of broadband media contents in the IP bearer network and delivering the contents to the edge network, it is necessary to introduce CDN cooperate with stream media technique to support non real-time and real-time IPTV services. The following network control requirements should be considered as CDN based content delivery. Content distribution network should be layered. Each layer has several serving node. The IPTV service network should be constructed flexibly by serving nodes. The serving node should be constructed by a node controller and several stream servers. Same network layer should adopt distributed structure. The serving node in same layer can communicate with each other to exchange the contents. The node controller provides the load balance among the stream servers in the serving node, and adjusts the deployment of the contents between serving nodes. Contact: Huang Zheng ZTE Corporation P.R. China Tel: +86-25-52871266 Fax: +86-25-52871000 Email: [email protected] Yang Wei ZTE Corporation P.R. China Tel: +86-25-52871121 Fax: +86-25-52871124 Email: [email protected] Attention: This is a document submitted to the work of ITU-T and is intended for use by the participants to the activities of ITU-T's Focus Group on IPTV, and their respective staff and collaborators in their ITU-related work. It is made publicly available for information purposes but shall not be redistributed without the prior written consent of ITU. Copyright on this document is owned by the author, unless otherwise mentioned. This document is not an ITU-T Recommendation, an ITU publication, or part thereof. -2FG IPTV-C-0158 Stream server provides stream serving in real-time to nearby users under the control of the node controller. Use case a. The following diagram illustrates the CDN briefly: Roof node control Stream Server Stream Server Leaf node control Leaf node control Stream Server Stream Server Stream Server Leaf node control Stream Server Stream Server Stream Server Leaf node control Leaf node control Stream Server Stream Server Stream Server Stream Server Stream Server b. The following is sketch map of real time content delivery in CDN network Root node control Stream Server 3 Leaf node control 1 Stream Server 2 Stream Server Stream Server 4 Leaf node control 2 Stream Server 5 Stream Stream Server Server1 6 7 1 B A 8 STB Stream Server 2 Stream Server -3FG IPTV-C-0158 1. The STB transmits the user’s request to the stream server 1. 2. The stream server 1 sends the request of real-time content pull to Leaf node control 1 after finding that local storage has no needed content. 3. The leaf node control 1 pitches on Leaf node 2 which is one of its depending leaf nodes and sends the request of real-time contents pull to it. 4. The leaf node control 2 pitches on the stream server 2 according the load balance principle and sends the relevant parameters of the stream server 2 to the leaf node control 1. 5. The leaf node control 1 notifies the stream server 1 to pull the media content from the stream server 2. 6. The stream server 1 pulls the real-time stream from the stream server 2 through RTSP. 7. The stream server 1 transports the real-time steam to user terminal through RTSP. 8. The A and B thick arrows illustrate the direction of the stream flow. 3. Proposal It is proposed to add above requirements to section 8 of ‘FGIPTV-OD-0010e’. ____________