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China Telecom Beijing Research Institute for IPTV project engineers told reporters, China Telecom is testing on CDN (Content Delivery Network) and P2P (peer to peer, peer connection) technology, IPTV system platform. China Telecom has concluded that: the perfect combination of P2P and CDN to play their technological advantage, is one of the future direction of the evolution of IPTV.

Preliminary agreement

Similarly, recently, research vice president of the Xiongyan Netcom is also clear that Netcom is considering the application of P2P technology to IPTV, in the application of P2P CDN is a viable approach.

After several years of research and practice, industry experts have begun on how to reach a consensus on P2P IPTV application: combination of scalability and P2P CDN reliability, manageability, you can build a managed, carrier-grade content to load application The IPTV system platform.

P2P technology has been interested in communications expert Hou Ziqiang, said: “At present, China's IPTV system uses client / server (C / S) mode, using this model to provide IPTV services should now have broadband Internet to transform, so the router to increase multicast function, transformation of high cost. Therefore, the client / server system restricted the development of IPTV to resolve this contradiction is to be IPTV architecture to connect to the P2P mode of evolution on the other. “

CDN and P2P technology advantages and disadvantages in the application of complementary. CDN and P2P currently being used in different fields, CDN is mainly used for reliable Web and streaming media content distribution, and P2P is mainly used for content exchange.

R & D center in Hangzhou China, as Beijing told reporters when the bright, CDN is built on existing IP network infrastructure, on top of a value-added network, is deployed in the application layer of a layer of network architecture. CDN's core strategy is the use of intelligent technology, content and services center push the network edge, enabling users and services in the nearest place to get the best quality service.

The P2P and CDN adopted a completely different content delivery methods. P2P is a different PC for users, not through the direct exchange of data relay device technology. It broke the traditional Client / Server model, on the other network, the status of each node are the same, with the dual character of the client and server can also service users and service providers.

More differences

Although industry experts on the P2P IPTV platform in the direction of development reached a preliminary consensus, but the experts of different operators in the IPTV industry chain role, the core network architecture issues, but there are no small differences.

CATR Yang Kun of the view that P2P use should be limited. Operators in the premise of no real economic benefit will not take the initiative to increase the bandwidth, so, in the same bandwidth, the only users increased consumption of resources, would make the Internet the same as Beijing's traffic congestion. Therefore, the user must P2P IPTV system usage is limited to a specific context, rather than the uncontrolled use.

The communications expert Hou Ziqiang insisted that, IPTV is the essence of service to ordinary consumers, should be free and open Internet operations rather than in a closed telecommunication network. IPTV's current operating mode determines the industry can not go deeper and further, only P2P mode in the IPTV industry as a whole can be more healthy, carriers of the so-called control of P2P is short-sighted performance.

Moreover, in the core network architecture issues, industry experts also found the opposite point of view. IPTV uses P2P technology platform can build on it in the IMS?

China Telecom's Shanghai Research Institute of an engineer that IMS-based IPTV platform is the future direction of the evolution of IPTV. The UT Starcom Yang believes that, IMS architecture is more suitable for point to point communication model, and for IPTV broadcasting this multipoint model, IMS does not apply.

Hou Ziqiang application from the market point of view to analyze the problem: “IMS architecture in a manageable IP professionals online, to support the existing telecom operators and billing model, which requires the establishment of a carrier-oriented chain, to ensure operators to maximize the benefits, like today, like China Mobile Monternet. “For businesses, large customers, VIP and other special on QoS and security requirements and are willing to pay for the users, IMS might be a good choice . However, broadband consumers more reluctant to accept this model, consumers prefer the monthly subscription model. This is the current online video more than the number of IPTV users, the reason why a higher frequency of use.

Standardization distress

Although the researchers used the P2P IPTV platform is very promising, but actual deployment of the technology is still a long way. Shanghai Telecom for IPTV-related technology transformation MAN told the reporters that the current priority of Shanghai with differentiated services approach to ensure that IPTV's QoS, and the existence of P2P traffic, the operation of the IPTV is still a certain threat.

Xiongyan that: “The current P2P technology only after adequate standardization, it might apply to IPTV network. IPTV platform operators want is a standardized, open architecture.”

“For P2P IPTV platform standardization, the industry is a major consideration in how the media exchange network using P2P technology to improve efficiency in the future we have to consider storage, content management and other aspects of the mechanism for the introduction of P2P, Streaming Media link between the server and terminal technology and the introduction of P2P. “Yang Kun said.

P2P research carried out in foreign countries, the academic community include P2P Working Group (P2PWG), the Global Grid Forum (Global Grid Forum, GGF). P2P Working Group set up the main purpose is to accelerate the establishment of P2P computing infrastructure and the corresponding standardization. P2PWG established, on P2P computing in a unified terminology, but also related to the draft form, but slow progress in the standardization work.

“P2P needs to have a standardized process.” PPStream Pan Yong, director of marketing, said, “At present, the development of P2P technology is still in the 'Warring States Period', P2P by different companies in various areas of research and development, we hope that their products and technologies to dominate the world, but limited to a variety of objective or subjective reasons, each company's P2P technology has some limitations. the future of P2P in the standardization needs of the industry chain is also the active efforts of the parties. “

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