A novel OBS ingress node which offers improved quality of video streaming over an OBS network is introduced in this paper. The suggested scheme is called the Enhanced Classified Cloning Scheme (ECCS) - it improves video traffic quality without affecting other traffic, such as Best Effort (BE) traffic. The new technique was evaluated through extensive ns-2 simulations, including development of new modules for the purpose of evaluation. Burst aggregation was based on a size threshold, with LAUC-VF for data channel scheduling and LAUC for control channel scheduling. Simulation results show the effectiveness of the new scheme when carrying out video streaming over OBS networks. The average gain in video quality was 6 DB under medium and high network loads (the worst case scenario evaluated here) while a greater gain in PSNR value was realized in other scenarios with both 10% and 30% video traffic. The resulting packet end-to-end delay and jitter values were acceptable, with an ETE delay of up to 17ms, and mean jitter less than 0.3 ms, when the network load was more than 20% The increase in network load with the new technique was comparatively small (a maximum of 12% in the worst-case scenario and with a video sequence that has the most "A" packets). A comparison of the load increase shows the outperformance of the suggested scheme especially when there is a high proportion of video traffic.
|Title of host publication||2011 16th European Conference on Networks and Optical Communications (NOC), PostDeadline|
|Publisher||IEEE Computer Society|
|Number of pages||4|
|Publication status||Published - 2011|