Business Introduction
ITU-T (International Telecommunication Union) for the multimedia service is defined: an integrated, interactive services and synchronization called multimedia services. Refers to the integration of the content data can be information of the multimedia and hypermedia information, script information, and application-specific information, storage, transmission, processing, appearing capability. It refers to the mutual interaction between the service control system and human service system, multimedia service is a prerequisite characteristics. The synchronization refers to the multimedia service terminal to show images, sound and text are synchronous mode operation.
For example, a user wants to retrieve important piece of historical events, motion picture (or still images) the event is stored in an image database, its language and narrative description in other databases. Multimedia service terminal via different transmission paths to the required information extracted from different databases, these wells will sound, image, text synchronizing together to form a whole of information presented to the user. The sounds, images, text synchronization and synchronization information to the user.
In recent years, the development of DWDM (storing a combination technique) solution of the backbone transmission capacity, using a variety of broadband access technologies, especially the application of LAN technology solves the transmission capability of the access network technical issues multimedia service transmission capacity bottlenecks have been resolved, which makes the start really into people's lives based broadband multimedia services platform.
qualitative requirements
1, the conventional multimedia service traffic were similar pattern in the application, there is a certain correspondence between some of the conventional multimedia service traffic , has a similar application areas, based on such an understanding, we can imagine the state of the current market demand and distribution of various types of communication services to predict the future needs of users of multimedia services trend.
2, the multimedia service fails to classify network environment, this is for "independent of the network to provide services to users," such a consideration. The so-called "independent of the network," it is for users, meaning users will have any kind of communication lines and communication terminal can enjoy the corresponding service, need not worry about which network environment can support the business.
3, the multimedia service is generally provided in the form of particular application to the user, and sometimes an application may involve a variety of types of sales, usually with a conversational service one or more non-session services The combination.
Business Type
broadband multimedia services according to the service content generally have the following categories: Internet services, mobile messaging services, based on the location-based services, mobile commerce-based services, multimedia-based service, video services and so on. It has now achieved more applications and broadband multimedia services mainly include telemedicine, online shopping, online voting, online video broadcast, VOD video on demand, Internet TV, online education, broadband games, video conferencing, video chat, multimedia, e-mail and other services. The following highlights one of the eight business.
1, telemedicine: As medical standards are not the same all over, telemedicine system can timely treatment of difficult diseases the country, which will also be a focus on the development of broadband multimedia services.
2, online shopping: shopping tend to shop around. How can I buy desirable items, online shopping is an excellent method. When one wants to buy goods, it "may go to the mall to see, field trips" (use of broadband multimedia services), and then compare (brand, quality, price, etc.), decided to buy after shopping online.
3, online voting: the annual Spring Festival Gala has a wonderful program, and have selected the excellent program, the audience always vote "impressionistic." Broadband multimedia voting system for the audience to provide the conditions, it can tune out their favorite programs when compared to the vote, the final vote to decide which programs, which can be truly fair, just and open.
4, multimedia monitoring system: urban traffic management systems, real-time acquisition of each section, each traffic intersection, adjust the flow of vehicles according to road conditions, real-time control of the intersection traffic lights, give full play to the role of the road. This application is very common, such as intelligent building monitoring systems, industrial control systems and security guards systems.
5, online learning: prestigious universities very popular with people of all ages, these schools have academic profound and experienced professors, as well as advanced laboratories and teaching conditions, distance learning systems can take advantage of these resources, it like personally attending these schools as satisfactory learning. Such systems can also be used for remote training and remote libraries.
6, on-demand TV: Current TV system user can change to a different program by channel switching, TV and content-on-demand system, users can not only need a single call can also be achieved as VCR rewind, fast forward, pause and search functions, access to quality broadband multimedia information services, when users watch TV will be "active", what want to see what you can see. Such applications include video games and karaoke OK.
7, multimedia message services: multimedia message services and multimedia message service (MMS) is similar, can send and receive content rich multimedia content, including formatted text, audio, images and video content, such by the transition to multimedia text, just as the PC world, as from the DOS to Windows transition. Multimedia message service allows the user to use freely edit the template or select fixed format template, insert text file video, audio, image format in the message, edit the text, listen and watch and enjoy the feeling, with the most intuitive way to fully express the most abundant the emotional content.
8, e-banking: electronic banking is a transaction-based business, not only to the user database to obtain the necessary information, but also to modify the contents of the database; this involves money and business transactions requiring confidentiality high reliability. With electronic banking, can achieve interoperability between the bank and 24 hours of office, greatly facilitate the users. Such applications can be used for securities trading, futures and so on.
Although there has been relatively rich broadband multimedia services, but unfortunately, currently serving multimedia services on the network are mostly unsatisfactory. If you watch a movie on the network, Renqibuwang site barely can also watch online, but once Sheremetyevo site, when a high number of concurrent users, the online viewing experience becomes extremely bad. Simply put, that is, "The more people the more slowly." But in the 3G era, this phenomenon can be significantly improved.
network requires
In general, the Secondary service quality premise MULTIMEDIA do business requirements for network performance, including:
1, the transmission rate. Usually tens of kilobits / sec to several megabits / sec.
2, end to end delay. End delay limit is to ensure real-time transmission.
3, between the media delay jitter and delay time difference. These two indicators should be as small as possible, in order to ensure the synchronization between the internal media and the media.
4, the bit error rate. The bit error rate should be reduced to ensure an acceptable image, voice quality.
5, connection establishment / release time. General requirements for establishing or releasing the connection is completed in a few seconds.
multimedia services required network features include call control and connection control. The connection control also includes the following features:
1, routing. Choose the best possible route to provide minimum end to end delay.
2, the congestion control. Based statistical multiplexing network, prone to congestion caused by the deterioration of the quality of service, in this case, congestion control is a must.
3, QOS parameter control. Network using the necessary means to ensure the agreed upon during call setup quality of service.
4, bridge control. When the network can not support multi-point connections, need to rely on to achieve multi-point bridging unit of some business connections.
Technical Support
network support multimedia services network involved include: support for the underlying transport network, the multimedia service may involve multiple network environments, different network environments through a corresponding transmission , exchange mechanisms to carry multimedia services; support services associated with the network technology. It mainly depends on a number of business-related entities corresponding function according to the specific requirements of a certain category or categories of multimedia services to achieve. These entities are usually provided by the network / service provider. But as network elements multimedia service networks.
In recent years, the development of multimedia services is closely related to several network support are: user access network technology; business-related technology; multi-point control; media server; intelligent network technology.
3G effect
3G mobile communication system is the next generation wireless communication with the Internet and other multimedia communications with, it can handle images, music, video and other forms, to provide web browsing , conference calls, e-business information services. Its greatest feature is its wireless broadband high-speed data services carried a converged data services and voice services of multimedia services will become the main business of the 3G era. Experts CATR of Tan Qingling once said: "multimedia services is the inevitable direction of future development of the telecommunications business, it will change the traditional telecommunications services with voice-oriented features fundamentally replaced by the convergence of voice, data , images and other transmission services a variety of content. "
Since data 3G multimedia is the main business growth, so the development of broadband multimedia services will undoubtedly play a significant role in promoting the 3G services. Before 3G era has not come, it can be said that the development of broadband multimedia services first test in 3G business development. First, broadband multimedia services allow consumers to enjoy a variety of new communication services, allow consumers to 3G in these businesses were ahead of experience and perception, help develop consumer habits; Second, some operators of broadband multimedia services experience can provide 3G similar businesses valuable lessons, such as multimedia message service, a very important application is an important application on which both broadband and also 3G in; again, the development of broadband multimedia services can and 3G multimedia services become complementary advantages. After all, no business is difficult to grow the network, and the network is not large enough, it is difficult to high-speed business development. Of course, the development of broadband multimedia services to 3G action in no way limited to this only.