Service differentiation for video applications over OBS networks

A QoS enforcement scheme for video traffic over OBS networks is proposed. The suggested scheme (Classified Cloning for Video applications) was implemented and evaluated by extensive ns-2 simulations, involving development of new modules for performance evaluation. Video application performance over OBS networks was evaluated with different aggregation techniques/parameters. The new technique was compared with classical cloning, and showed superior loss rate (PSNR value), ETE packet delay and jitter. The increasing emergence of real-time applications (video streaming, online gaming, video conference etc) was considered, so two scenarios were evaluated with video traffic composing either 10% or 30% of the total. Simulations show up to 77% or 69% improvement respectively in packet loss rate over classical cloning for low loads, while the improvements becomes 51% or 42% for medium or high loads.

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