subject: QUALCOMM Multicast bring wireless broadband revolution - multicast, wireless, transmission - HC Network broadcasting industry [print this page] QUALCOMM Multicast bring wireless broadband revolution - multicast, wireless, transmission - HC Network broadcasting industry
Mobile TV 3G era will be the major wireless applications, this view being generally recognized industry. Now, consumers have been able through China Unicom's "World Wind" to customize mobile phones, watch some television channels and other multimedia content. In the foreseeable future, any consumer can freely through the cell phone market in the mainstream audio and video programs customized personal preference, into the brilliant movies and music, and attention to current events around the world situation, and never miss an exciting broadcast of any sporting event?? All this is based on the superb sound and picture quality. This means that larger amounts of data transfer, more communication channels occupied, it also mean that more large-scale network upgrade and expansion, higher Operation Costs and higher prices of services ... ....
As wireless transmission resource constraints brought about by the high transport costs and can not solve the deployment of 3G networks. 3G network will give us a more advanced transmission, higher bandwidth and faster data transfer rate, but its distribution for each user a separate channel for data transmission has not changed the nature of: mobile operators had to Each base station covers a user is assigned a dynamic, mutual non-interference in the channel of information to be transmitted. Although 3G networks can greatly enhance the bandwidth and transmission rates, but when the communication carrier sector growing number of users within the time limited bandwidth will eventually be exhausted, not only using a similar mobile TV this large-capacity data transmission can not be achieved, the Even the ordinary voice calls will also be seriously affected. "Point" on the development of mobile TV into the limited resources and high rates being double embarrassment.
Channel multicast technology to solve the shortage of
Root of the problem is that each user is to be occupied by independent channels. In addressing this question, Mobile TV, etc. on the transmission bandwidth and high quality of service requirements for wireless applications development is bound to be derived from operating costs, service and prices, the constraints?? This is why Qualcomm launched last October The "multicast (Multicast) technology" was the trade as "disruptive" technology reason. The so-called "multicast", by definition, means using the same common channel to provide services to multiple users simultaneously. Multicast compatible with the existing EV-DO network can be viewed as EV-DO network, the existing natural evolution. The technology of all base stations in a region covering the same sector in the reserved time slot data, and then in the reserved slot to all users within the region the same data packet transmission, to improve transmission performance, to achieve within the same channel all the users to receive the same content. The technology and radio or television similar to belong to Broadcasting Technology: operator (or the radio, TV station ) During the time the content of broadcasting, the receiver does not have a clear target; users according to their needs or preferences to selectively watch the broadcast content.
Multicast completely subvert the traditional mobile communications "distribution channel - a connection - Transfer content" of wireless communication was, therefore, workers in the field as a disruptive technology. The essence of technology transfer and services determine its characteristics are as follows:
First, large capacity, high-definition multimedia content with limited resources can be theoretically unlimited users to broadcast transmission, the increase in the number of users and the quality will not result in decreased transmission rate, connection instability problems; the multi- users sharing a single user must assume the original channel and data costs, making a significant reduction in unit cost of customer service, leading to lower tariffs. In this way, mobile TV applications such as high data transfer costs will be significantly reduced, the cost will no longer be a major obstacle to universal mobile TV.
Second, multicast technology directly in the existing 3G network deployment. Therefore, mobile operators, they do not need to spend additional network construction costs without adding new spectrum, it can be based on their existing or Planning Be deployed in CDMA 2000 1xEV-DO network to offer new wireless multimedia services.
Third, multicast technology suitable for the type of quasi-point live shows and a video distribution network control program. Since multicast uses broadcast manner, multiple users share the same data before (from the base station to terminal) transmission channel, and not have the reverse (from terminal to base station) transmission channel, can not be achieved VOD Video coaching, but will be very similar to traditional television news broadcasts appropriate and important events / sports events and other live content transmission and playback.
MediaFLO: the emerging multimedia content distribution solutions
Multicast above three features make the mobile TV truly become the radio, television, newspapers and the Internet after another an emerging independent media outlets possible. Now, Qualcomm is actively pursuing the next emerging channels worldwide applications, and specially set up and set up a special subsidiary MediaFLO USAInc full responsibility for this operation. QUALCOMM's vision of, MediaFLO is the one covering all the digital media broadcasting network, based on multicast technology, a dedicated spectrum for the regulations to allow a small amount from one or several high-power transmission tower market design of the single prior to the transmission link (ForwardLink Only) transmission network. With other multicast technologies (such as DVB-H Etc.) compared to, FLO technology is designed specifically for mobile devices, give full consideration to the mobile device technology for low power dependence, in providing a more extensive coverage also makes mobile devices more energy-efficient, and thus have a stronger mobility.
MediaFLO network, like its name, will be one way forward link broadcast to provide users with real-time transmission of video, audio and other content. After the completion of the network will use up to 30 frames per second QVGA video and high-quality Stereo Audio, the quality of the content transmitted well beyond the current quality of mobile multimedia content. Moreover, the network can accommodate 50? 100 countries and regions, content channels, including up to 15 live broadcast channels and countless video distribution (clip-cast) and audio channels. The network will not replace the existing 3G network, but will become an important complement to existing networks: operators, MediaFLO network will provide users with the forward link
