Research And Implementation Of Video Transmission Based On Wireless Network

With the rapid development of moblie communication ,people not only need communication with texts, oices,images, but also need multimedia information services those can be provided anywhere anytime. Mobile multimedia services are thought to be important services in 3G communication age. Wireless multimedia services, especially 3G mobile multimedia services have been widely applied in Korea,Japanesse,and some countries in Europe. 3G serveices are also going to be further applied in our country.Mobile streaming media is a streaming media technology that been used on wireless network and mobile teminal. It provides streaming media services for mobile phones through 2.5G or 3G communication networks. It is result of combination of wireless telecommunicaions and multimedia telcommunications.This paper analysiss the several key technologies of wireless streaming media transmission system. Including wireless streaming media transmission control protocol, wireless streaming media QOS control mechnism and software architecture of the system. And wireless streaming media transmission control protocol includes RTSP/SIP protocol,RTP/RTCP protocol; wireless streaming media QOS control mechanism is maily to research on several end-to-end adaptive control Algorithms based on RTP/RTCP,what's more, propose the Congestion Control Algorithm based on MSB burffer.The main tasks of the paper:simplified implementation of embeded streaming protocol RTSP/SIP on mobile platform and improvement of RTP package.In order to real-time of video transmission and quality of video replay,design a congestion control module based on buffer and package loss process module on client:Buffer module change the buffer size dynamically to vary the video transmission delay and inform the internet state by communication with server;Package loss process module deal with those loss frame and incomplete frame avoiding jitter and Mosaic phenomenon. In the end, the paper analyses the design and implement of wireless streaming media transmission system, testing the system and analysing the test result.