Mobile TV technology and the development of standards and implementations
I. Overview of mobile TV technology
From the user point of view, is the use of mobile TV handset to watch TV programs, and some individuals operating a business.
Launch of mobile TV business is built on the popularity of mobile data services, mobile phone to improve performance and increase network transmission capacity based on. The business initially through mobile unicast streaming media technology in the form provided to the user, but due to limited network bandwidth, greatly restricted the number of concurrent users. By the end of 2002 a number of related international R & D institutions and companies began to realize in the mobile phone to receive the broadcast of high-quality audio and video content to study. The study mainly for the following requirements.
* Radio transmission: In order to improve the frequency of resource utilization, in order to provide services to more users, need to be provided with broadcast services, and radio transmission technology is one of the key technologies.
* Terminal saving: As the need for battery-powered mobile terminal to achieve receive and play television programs, thus saving the terminal to become a very critical technical requirements, through the joint efforts of all sectors to ensure the provide long enough viewing time.
* Operations Management: mobile TV not in high-quality audio and video effects to attract users, because the mobile TV can provide to the user's viewing experience is not comparable with the digital high-definition television. Only through the realization of the user and the networks two-way information exchange, to break the traditional mode of passive receivers of services to achieve user personalization operation can provide users with real character and attractive services. To achieve this, on the one hand ask the network to have two-way interactive capability, on the other hand also requires the network to provide flexible, reliable, user and business management.
* Roaming capability: As highly mobile end-user's mobile, so users use mobile TV business hopes to achieve a natural business, roaming, mobile TV and this is an important distinction between traditional television.
The concept of mobile TV that is raised immediately drew international attention, national equipment manufacturing and network operation industry are trying to become the new growth of mobile services. Britain, Germany, France, the United States, Sweden, Finland, Italy, Norway, Switzerland, Austria and other countries have intensely related industries have to start all forms of testing and testing activities, some countries have entered the commercial phase of trial. Particularly in the pace of the most advanced South Korean business, May 1, 2005 South Korean mobile carriers SKT and satellite mobile TV service providers TUMEDIa has opened the way satellite-based mobile TV service.
Have been carried out from the global test and trial commercial situation, the pilot project to use more mobile TV broadcast network operators, mobile operators, content providers co-operated television model. Among them, the broadcast network provider to provide mobile television broadcasting downstream channel and content platform operations; mobile operators to provide uplink transmission channel, is responsible for user authentication, billing, and provide interactive information services, while providing personalized on-demand required for the user downlink transmission; content providers is to provide television content.
Second, the realization of mobile TV technology
Mobile TV as a new multimedia services, its implementation is the result of combination of multiple technologies, summed up in three aspects of the implementation technology: downlink transmission technology, uplink interactive technology, business technology layers to achieve.
Which uplink interactive technology is usually achieved through the mobile network, mainly to achieve the business to provide uplink transmission channel, to ensure two-way interactive capability; the business layer is responsible for implementation techniques to achieve mobile TV business, authentication, accounting, operations discovery and acquisition, business custom, content protection and other flexible applications, in order to ensure availability of mobile TV operators and manageability; downlink transmission technology is the key to achieving the business, responsible for achieving the transmission of TV programs to users. This part of the technology, the industry is very high degree of concern, the proposed implementation techniques are also more varied, can be summed up in a different downlink transmission technology can be divided into three kinds of implementations.
1. Based on mobile network technology implementations
As mentioned earlier, through the mobile network television, first by way of mobile streaming media implementation. At present China, China Mobile and China Unicom have been based on its GPRS network and were CDMA1x network using streaming media technology launched mobile TV services. In fact, both as a mobile data service to launch, and its implementation is also much the same way. This traditional mobile streaming media through the realization of the mobile TV business, with a certain extent, satisfy people's needs, but there are many ways unsatisfactory. For example: mobile network bandwidth is limited, playback is not very stable, the number of concurrent users is limited, higher charges and so on.
It is because of the traditional mobile streaming implementations there are many restrictions on how the international community began to study multimedia in mobile networks (including video, audio, data, etc.) of the broadcast, MBMS and the BCMCS technologies emerged, namely, used in WCDMA and cdma2000 systems. Such technology is at the existing mobile communication network based on improved, to provide users with downlink broadcast channel, its frequency of use is still the host band for mobile communication systems, mobile data network for the broadcast or multicast mode mobile TV provide the conditions for business.
Based on mobile network technology implementations inherited the mobile network capacity inherent in many. For example: the business user authentication, and user management, billing and control services, customized and personalized services on-demand, interactive applications to achieve, with the location-related businesses, etc., these business development for mobile TV is a very necessary. However, implementation of such technology need to Zhan Yong 3G core of the system frequency, the frequency In respect of resources have been tight for mobile operators is undoubtedly a need to consider that the frequency of use of the so-called economic issues.
2. Based on terrestrial digital broadcasting network technology implementations
These implementations from technology used in terrestrial digital broadcasting and television transmission technology is generally used in radio and television frequency band. In order to meet the characteristics of mobile terminals, some technologies based on the original technology to be improved as mobile TV technology, and other technologies are also for terrestrial digital broadcasting
I am an expert from Frbiz Site, usually analyzes all kind of industries situation, such as water heater anode , metal wall stud.
Processing your request, Please wait....
