Improved DWRR Scheduling Algorithm in PhysicalFrame Time-Slot Switching

Deficitweighted round robin (DWRR) does notmeet the delay requirement of rt-VBR (real-time variable bit rate) traffic. To solve this problem, an improved DWRR scheduling algorithm was proposed. A new service classwas added in the proposed algorithm tomeet the delay requirement of rt-VBR traffic, while scheduling nrt-VBR (non-real-time variable bit rate) traffic effectively. Simulation results show that the average delay of rt-VBR traffic inDWRR is3. 4mswith the improved DWRR, a decrease of30. 6% comparedwith that(4. 9 ms) with DWRR.