An IP DiffServ framework for real-time video transmission

This paper presents an improved IP differentiated services (DiffServ) framework which is suitable for real-time video transmission. Especially, we investigate MPEG-4 video transmission. Based on the feature of MPEG-4 flow and the extent of network congestion, implements a new DiffServ marking algorithm. In the border router, we propose a new scheduling algorithm, called the Bit-based Weight time Slot Compensate (BWSC) scheduling algorithm, which dynamically adjust the weighted quantum of service. Under the condition that network bandwidth can't guarantee the demand of MPEG-4 real-time transmission, the PSNR comparison or restored MPEG-4 video frame sequence verifys our method has much more better performance than Best-effort network. End-to-end delay and delay jitter also meet the real-time transmission demand in the improved DiffServ network.