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Smart Multipath Capacity Aggregation for High Quality Video Streaming

We present an end-to-end scheme to aggregate a diversity of wired or wireless network paths in an application content-aware manner. The objective is to realize a virtual pipe abstraction that offers high capacity, low perceived jitter and low perceived loss for video streaming. The scheme called “Smart Multipath Capacity Aggregation (SMCA)” uses elementary information about the video stream (eg: I, P, B frame type, packetization and sequencing information) to intelligently map packets to flows in different groups. Flows are classified into delayand loss-based classes using end-to-end estimation of delay , loss and rate information. The size of these groups is adaptively determined by the current set of application packets and flow characteristics. The gains are realized by efficient matching of application content diversity to the network performance diversity at any instant of time. SMCA is designed to be scalable with increasing number of available network paths and with increasing content and network diversity. Our experiments demonstrate marked improvement in video playback quality measures both on an absolute and relative basis (compared with other path-diversity based schemes). Interestingly, our relat ive gains are even better with an increase in performance diversity of network paths.