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Title Dynamic Bandwidth Allocation using Adaptive Minimum Guaranteed Bandwidth for Ethernet Passive Optical Networks
Degree MS
Author Wan-Su Lim
Advisor Kiseon Kim
Graduation Date 2007.08.24 File
    Date 2013-09-11 20:40
Ethernet Passive Optical Networks (EPONs) can be applied to realize the Fiber-To-
The-Home (FTTH) for broadband access networks. As optical ?ber has the potential
to satisfy the ever-increasing bandwidth demands, it is necessary to prevent the bottle-
neck between the core networks and the access networks. Among many research areas
for EPONs, bandwidth allocation has been deemed the most critical issue because
bandwidth allocation can a?ect the overall the performance of EPONs. In particular,
we focus on the dynamic bandwidth allocation (DBA) based on the cyclic polling al-
gorithm. In the cyclic polling algorithm, minimum guaranteed bandwidth is used as
the reference of bandwidth allocation for optical network units (ONUs). Because the
previous DBA (EPON dynamic scheduling algorithm, EDSA) uses the ?xed minimum
guaranteed bandwidth, sometimes it can create a bottleneck and subsequent network
shutdown under incoming burst data tra±c. Therefore, the new DBA, the modi?ed
EPON dynamic scheduling algorithm (MEDSA) uses the adaptive minimum guaran-
teed bandwidth to e?ectively manage burst data tra±c. In addition, to clarify whether
or not MEDSA is better than EDSA, the its performance needs to be extensively inves-
tigated under a practical scenario that includes various tra±c ,taking into consideration
the QoS. Thus, we measure the end-to-end delay and the network throughput by using
OPNET under various conditions.
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