Quality of Service and Performance Evaluation of Congestion Control for Multimedia Networking

The most important components of multimedia networking are video streaming and synchronization. In video networking, the frames are split into smaller packets at the application layer. The packets of a frame are assembled before being processed at the receiver. For realtime video streaming, packet acknowledgments and retransmission are not practical. When congestion occurs, some packets may be dropped. Consequently, the entire frame (and sometimes successive frames in a group) is considered lost (i.e., not displayable). Often a loss of one packet from the frame can lead to a loss of the whole frame. Selective Message Discarding Policies have been proposed to reduce or avoid congestion and achieve a better buffer utilization by discarding all packets that do not belong to good messages. In this paper, these discarding policies are studied and applied for MPEG video data transmission. Our queuing analysis for video data yields explicit (closed form) expressions for the average buffer occupancy and loss probability by using Early Message Discard and Partial Message Discard policies. The quality of service (QoS) has been studied and evaluated based on a frame (or a group of frames) instead of a packet. The results for different arrival rates, service times, and frame sizes are presented. KEYWORDS—Average buffer occupancy, loss probability, EMD and PMD polices, packet model.

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