Delivering the IPTV service in China requires integrating the communication security of telecommunications networks, the content of broadcast and tv networks, and therefore the network features of the Internet. Yet the IPTV is completely different from the subsequent 3 points:
(1) Traditional telecommunications feature person to person interactions while in IPTV we see a replacement pattern of a person to machine communication from service initiation through termination.
(2) The IPTV allowing subscribers to customize their individual TV programs, view them regardless of the time and site. it’s possible to regulate the speed of the program (fast forward or backward) that’s not a feature of the normal TV where viewers only can accept what prepared for them.
(3) IPTV has a different business patterns and search technology from Internet services.
To sum up, IPTV may be a content-based new service endowed with multimedia features. The “newcomer” service of IPTV is now taking hard progress . Industry barriers, content shortage, defective delivery chain and immature business pattern are standing in its way. However, it磗 still driven forward by market demands of not only telecom operators, but also the content providers and consumers.
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1 Technical Requirements of IPTV Services
The IPTV, as a brand-new service, features a way longer and more complex industrial chain than traditional service patterns. On the chain, the most nodes are the content providers, the service network carrier and therefore the user , during which the service network carrier is that the main body of the service. The service network is formed from the IPTV service network and therefore the service bearer network. The service bearer network are often the prevailing transmission access network that’s carrying telecommunications or broadcast and tv services. The service network carrier can then found out the IPTV service network over the telecommunications or broadcast and tv infrastructure, collect programs from the content provider, and eventually deliver applications and services to finish users. The content provider is liable for offering attractive content to tug the users within the network. this is often critical because the IPTV may be a content-based service and therefore the user is that the revenue source on the chain that determines whether the IPTV service is capable of going further or not. the three factors on the chain pose different requirements on the IPTV service network and that they as an entire determine the technical orientation of IPTV service.
While the web services developed these years, conventional telecom services are shrinking and it now seems the typical Revenue Per User (ARPU) for the fixed network can never draw up again. Telecom operators need to address new services for fresh growth poles. Then it comes the IPTV service, by whose rosy prospect and market potential the telecom operators are attracted. Most telecommunications operators abroad have had IPTV deployed to supply baseball play services that integrate voice, video and data to spice up ARPU. Two fixed network operators in China also are conducting experimentation of IPTV services on their networks during a bid to figure out optimum specification and business pattern.
Content providers need to “market” their products during this developing free enterprise of China. the straightforward mode of content publishing seems just outdated and it often finishes up in stickers. The IPTV is simply such a replacement platform for content providers to showcase and revitalize their products. As an upstream node on the IPTV industrial chain, content providers are especially concerned with copyright protection issues and revenues that content resources can save specific business pattern.
During the past few years, broadband users in China have multiplied in response to the advancement of broadband network infrastructure and network access technologies. While progresses are being made within the Internet, computer and multimedia technologies, more and more broadband users expect multimedia services to be delivered additionally to existing text and data transmission over IP network. Nowadays the IPTV emerges because the most needed solution to the broadband user磗 demand. End users of IPTV services have an interest in whether the services are well worth the cost or not. They expect more colorful content than traditional movie/TV programs, better feature and quality than cable TV, and straightforward use like remote . they might wish to customize individual programs and luxuriate in it at any given time and place.
Business exists where the purchasers are. As within the case of IPTV, its service network should involve network, computer and image technologies. To deliver IPTV services, problems with old business patterns, network integration, and security mechanisms need to be addressed first. Listed below are the technical requirements of IPTV services:
(1) Quality of Service (QoS)
The IPTV may be a content-based real-time service that’s expected to entertain the purchasers , which makes high QoS an important piece in commission delivering.
(2) Source Codec
The IPTV service network has got to select top quality source codec and network transmission technologies to supply top quality images.
(3) Service Performance
The service should accompany clear program guide and navigation functions, also as great-information search and governance technology, content storage, and distribution technology.
(4) Business Pattern
Proper business pattern should be designed to optimize customer experience in a cheap way.
(5) Digital Security
to guard content providers? content resources, security management and copyright protection measures should be taken within the service system. Unified certification should be used to suit customer磗 nomadic feature.
(6) Network Quality
The service bearer network and therefore the access network should be ready to deliver high-quality service, and therefore the network resources should be knowable and controllable.
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Generally, the IPTV service requires technologies that comprise information security, QoS, business pattern, content provisioning, service governance, network capability, source codec, and customer roaming. Every technical requirement is implemented with the support of corresponding technologies. In constructing the IPTV service architecture, it磗 better to stay an eye fixed on the longer term especially for those immature techniques adopted while supporting as many technical requirements as possible. The IPTV service network is to be designed because the new generation multimedia application platform that’s open and secure and fully use the benefits of the present network and technology.
2 IPTV Service Architecture
The architecture of the content-based IPTV service should first leave comprehensive services. It provides live TV, TV on Demand (TVOD), and time-shifted TV on one platform. The architecture is open and it supports local and cross-regional user and repair certification. Next, it should have good service performance and security mechanisms and ready to provide clear Electronic Program Guide (EPG) and smooth TV images.
2.1 Structure and performance of the Service Network Layer
The service network layer implements the service control of IPTV and may be a foundation to expand service applications. Figure 2 shows the structure of the service network layer, which comprises functionality of content operation, operation and maintenance, portal navigation, service management, media delivery, security management, and accounting and settlement respectively. Each functionality has several function sets.