earticle

영어

With the development of network and video compression technologies, more and more video applications emerged and enriched people’s daily life. Since high data rate of videos could exhaust bandwidth and starve data streams, DiffServ (Differentiated services) is proposed to balance synchronous transmission of two stream types. However, most existed researches aimed at receiving quality promotion of video streams, leading to poor performance of data streams. In this paper we try to find how to reserve proper amount of resources for video streams by evaluating transmission of various video sequences. Results show that (1) video transmission performance is content aware and is determined by data rate, data rate variation and continuous burst of the video. Reserved bandwidth of a video should be proportional to its data rate. If data rate variation is significant, more bandwidth should be reserved. If continuous burst occurs, additional bandwidth is required. (2) If accurate data rate and its variation can be obtained and data rate variation and/or continuous burst are remarkable, adaptive bandwidth reservation is recommended. Otherwise, fixed reservation is better. (3) Large buffer size in routers will improve the video receiving quality.