Authors : M. Usha and R.S.D. Wahida Banu
Abstract: Quality of Service and multimedia networking add new dimensions to the distributed multimedia applications. Approaches of congestion avoidance such as Random Early Detection favour TCP flows. Active queue management schemes like FRED support fairness, but, punish misbehaved, non-TCP flows. These mechanisms result in a significant performance drop in Quality of Service for multimedia flows because most of these flows use UDP. RED is the most popular AQM in IP routers since it reduces delay, compared to the traditional Drop Tail. Even though the delay is low, the delay variance or jitter is noticeable. Hence this work aims at addressing reduction of jitter while improving throughput. The design comprises a novel scheduler that works with an active queue management scheme. This scheduler has a single FIFO structure at the output queue of the IP router. This single FIFO removes the limitation in sorting complexity with the number of active flows. The proposed work uses per-packet time-stamping to enhance jitter management of multimedia flows. The ns-2 simulation results show that there is a significant reduction in jitter with the new scheduler.
M. Usha and R.S.D. Wahida Banu , 2006. A Scalable Jitter Management Scheme Through a Scheduler with Timestamps. Asian Journal of Information Technology, 5: 1239-1244.