The Research And Implementation Of Media Streaming Transport Protocol For Mobile Device

Media streaming technology is one of the hotspots in recent research of networking domain. With the development of mobile communication, this technology is applied more and more to the mobile devices. Media streaming on mobile device also follows the three common requirements, which are being real-time, flatness and synchronization. Designing a high-power transport protocol plays a crucial role in carrying out the object.Real-time Transport Protocol, called RTP for short, is the mainstream during all kinds of transport protocols. It makes use of UDP to transfer media data, because UDP helps to improve the real-time ability. At the same time, it collects the state information of network, so the upper layer applications can control the transport process accordingly. That is why RTP is the first choice in media streaming transportation.Since RTP doesn't deal with the state information itself, it is necessarily to add quality-of-service assurance in order to perfect the transport process, and the most important part is the congestion control. After analyzing the existing congestion control algorithms, a new adaptive algorithm, designed for the mobile device, is put forward. It introduces the basic theory of congestion control and makes best of the RTP framework. Using this algorithm, an integrate transport protocol library for media streaming data transmission on mobile device is designed and implemented. It overcomes the disadvantage of the universal RTP libraries, such as JRTP and CCRTP. They use multithread and STL, which are not available on mobile devices. It also enhances the quality-of-service assurance ability for it can judge the congestion state of network and adapt the transport mechanism.The tests show that the protocol library, called WMSRTP, is compatible with JRTP, one of the universal RTP libraries, and it is more suitable to be applied on the mobile devices. It proves that WMSRTP is creative and valuable.