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Design and Simulation of an Efficient Real-Time Traffic Scheduler with Jitter and Delay Guarantees

Design and Simulation of an Efficient Real-Time Traffic Scheduler with Jitter and Delay Guarantees. Fu-Ming Tsou, Hong-Bin Chiou, and Zsehong Tsai, Member, IEEE IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 2, NO. 4, DECEMBER 2000. Outline. Introduction Multilayer Gated Frame Queueing (MGFQ)

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Design and Simulation of an Efficient Real-Time Traffic Scheduler with Jitter and Delay Guarantees

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  1. Design and Simulation of an Efficient Real-Time Traffic Scheduler with Jitter and Delay Guarantees Fu-Ming Tsou, Hong-Bin Chiou, and Zsehong Tsai, Member, IEEE IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 2, NO. 4, DECEMBER 2000 Chin-Kai Wu, CS, NTHU

  2. Outline • Introduction • Multilayer Gated Frame Queueing (MGFQ) • Due-date Calculation Procedure • Due-date Calculation • Jitter Bound • Design Issue • Simulation Chin-Kai Wu, CS, NTHU

  3. Introduction • Scheduling Algorithms • WFQ, WRR • Simply deal with the reduction of implementation complexity • JEDD • Supporting both flexible delay and jitter guarantees, but with high implementation complexity • DFQ • Low implementation, but leads to the limitation on the scalability and granularity of jitter level • Multilayer Gated Frame Queueing (MGFQ) proposed Chin-Kai Wu, CS, NTHU

  4. FP informs DDCs to open the “gate” with period T FIFO with same QoS parameter Temporary-queue i buffers the cells with due-dates were in the interval [iT + 1, (i + 1)T] in the last refreshing-period PPD, APPD scheme to discard packets Operation of MGFQ Jitter bound of all VPs in Group i are within [(i - 1)T + 1, iT] Chin-Kai Wu, CS, NTHU

  5. Operation of MGFQ (Cont’d) Chin-Kai Wu, CS, NTHU

  6. Operation of MGFQ (Cont’d) Chin-Kai Wu, CS, NTHU

  7. Due-date Calculation Procedure Chin-Kai Wu, CS, NTHU

  8. Due-date Calculation Chin-Kai Wu, CS, NTHU

  9. Jitter Bound Chin-Kai Wu, CS, NTHU

  10. Design Issue • Suppose the local jitter bound assigned to VPi at the egress node H is JH. Then, the end-to-end transmission delay (CTD) of VPi is • Therefore, the end-to-end jitter bound [or called Cell Delay Variation (CDV)] is Chin-Kai Wu, CS, NTHU

  11. Simulation Model Chin-Kai Wu, CS, NTHU

  12. Cell Delay Distribution Chin-Kai Wu, CS, NTHU

  13. Cell Delay Metrics Chin-Kai Wu, CS, NTHU

  14. Cell Overdue Ratio Chin-Kai Wu, CS, NTHU

  15. Impact of Congestion Chin-Kai Wu, CS, NTHU

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