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Dynamic Bandwidth Allocation for Long-Reach PON: Overcoming Performance Degradation

Dynamic Bandwidth Allocation for Long-Reach PON: Overcoming Performance Degradation. Skubic , B.  ;  Jiajia Chen  ;  Ahmed, J.  ;  Biao Chen  ;  Wosinska , L.  ;  Mukherjee , B. Communications Magazine, IEEE , November 2010 . Presenter Chia -Cheng Chen. Outline. Introduction

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Dynamic Bandwidth Allocation for Long-Reach PON: Overcoming Performance Degradation

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  1. Dynamic Bandwidth Allocation forLong-Reach PON: OvercomingPerformance Degradation Skubic, B. ; Jiajia Chen ; Ahmed, J. ; Biao Chen ; Wosinska, L. ; Mukherjee, B. Communications Magazine, IEEE, November 2010  • Presenter Chia-ChengChen

  2. Outline • Introduction • Performance Degradation Of DBA In LR-PON • Multi-Thread DBA • Simulation Results • Conclusions

  3. Introduction • Examine for both Gigabit PON and Ethernet PON, the extent to which DBA performance degradation can be reduced by exploiting multi-threading.

  4. Performance Degradation Of DBA In LR-PON

  5. Multi-Thread DBA • GPON DBA

  6. Multi-Thread DBA(Cont.) • EPON DBA

  7. Multi-Thread DBA(Cont.) • Two ways of reducing the responsetime of the DBA in a PON • Reduced DBA cycle or polling cycle • Execute the DBA algorithm more frequently • In EPON • Introducing multiple DBA threads • In GPON • Reducing the DBA cycle and increasing the overlap

  8. Multi-Thread DBA(Cont.) • Multi-Thread DBA

  9. Multi-Thread DBA(Cont.) • Newly arrived frames plus(NA+) scheme • Traffic • Ii= I(ti–1, ti) : Ii= Ri– Ri–1+gi • Bandwidth demand is calculated • Bdem,i= Ii+ Ci , • Ci: compensate for backlogged traffic • (Ci= Bdem,i–n – gi–n,n>=1) • GPON: gi= f(Gi) • EPON: Ci= Bdem,i–n – gi–n + Ui–n,Ui–n means which occurred Gi: resulting grant Ri: report for logic queue gi= f(Gj), j < i

  10. Simulation Results

  11. Conclusions • Both GPON and EPON, multi-threading employing the proposed NA+ scheme, provides an avenue for mitigating the performance degradation of DBA in LR-PON.

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