1. Local-Traffic-Redirection-Based Dynamic Bandwidth Assignment Scheme for EPON With Active Forwarding Remote Repeater Node
Chien Aun Chan, Manik Attygalle, and Ampalavanapillai Nirmalathas
Optical Communications and Networking IEEEOSA Journal of (2011)
Volume: 3, Issue: 3, Publisher: IEEE, Pages: 245–253
Presenter Chia-Cheng Chen

2. Outline Introduction EPON with an action RN LT-DBA Algorithm
Simulation Results
Conclusions

3. Introduction Active forwarding RN(remote repeater node)
Increase the downstream performances using a traffic-redirecting technique.
LT-DBA mechanism
Increasing the upstream utilization and reduces the packet delay in the ONU.

4. EPON with an action RN Active RN(remote repeater node) Upstream
Downstream

5. EPON with an action RN(cont.)

6. LT-DBA Algorithm In the first phase In the second phase
The OLT will run the normal DBA algorithm to allocate timeslots to corresponding ONUs.
In the second phase
The LT-DBA algorithm will make the decision to excess grant a particular ONU’s assigned timeslot based on its previous upstream transmission.

7. LT-DBA Algorithm(cont.)
Ui,k :ONU I request slot.
Gmax:Max slot can assigned for each ONU.

8. LT-DBA Algorithm(cont.)

9. LT-DBA Algorithm(cont.)
OLT will assume that all ONUs are within the same subnet.
Empty timeslot received on a particular time interval that is assigned to ONU x.
Empty upstream timeslot occurred for ONU x and receives frames from ONU x with destination to ONU y.

10. Simulation Results

11. Simulation Results(cont.)

12. Simulation Results(cont.)

13. Simulation Results(cont.)

14. Simulation Results(cont.)

15. Conclusions
LT-DBA mechanism incorporated with repeater-based active RNs, which is improve the upstream transmission performance from ONU to OLT.