Research And Implementation Of Video Streaming Service System In 3G Network

With the fast development of 3G communication technology, the rapid increase of wireless network' bandwidth and mobile terminals' computational capability, traditional wired network video services are available on mobile terminals now, therefor mobile streaming media communication technology has become a trend and hot spot in the study of network technology. PSS which is defined in 3GPP mobile interactive media service framework provides a standard for streaming services in Mobile Network. By the increaseing requirement for mobile streaming service, a 3G network video streaming media service system is needed, which has profound influence in software engineering and application.Different from the traditional streaming media services, mobile network streaming media services are subject to many restrictions, not only the unstable data transmission in wireless channel cause by attenuation and interference, but also battery life, process capacity and buffer capacity constraints in mobile terminals. According to these features, a 3G network video streaming media services system has been designed based on the MPEG-4 standard, RTP/RTCP protocol and PSS technical specification. To solve the problem caused by the complex and ever-changing mobile network transmission channel, MPEG-4 standard and RTP/RTCP protocol have been studied, a multi-rate coding scheme has been proposed. Then, the Xvid encodec lib, modified LIVE555 streaming media lib and DirectShow platform have been adopted to implement the system. In addition, to penetrate the firewall used in mobile networks, a network penetration solution has been designed by utilizing UDP penetration packet.Experiments on the GPRS network and Internet are conducted to evaluate and compare different techniques. Results suggest that the 3G network video streaming media service system achieves good network adaptability, superior performance, stability and reliability. This system can satisfy the streaming media service requirement from different users in mobile network environment.