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Journal Article Hierarchical Dynamic Bandwidth Allocation Algorithm for Multimedia Services over Ethernet PONs
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Authors
Kye Hyun Ahn, Kyeong Eun Han, Young Chon Kim
Issue Date
2004-08
Citation
ETRI Journal, v.26, no.4, pp.321-331
ISSN
1225-6463
Publisher
한국전자통신연구원 (ETRI)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.4218/etrij.04.0103.0144
Project Code
03MT1600, The Study on High Speed LAN Technology Standards, Jung Hae Won
Abstract
In this paper, we propose a new dynamic bandwidth allocation (DBA) algorithm for multimedia services over Ethernet PONs (passive optical networks). The proposed algorithm is composed of a low-level scheduler in the optical network unit (ONU) and a high-level scheduler in the optical line terminal (OLT). The hierarchical DBA algorithm can provide expansibility and efficient resource allocation in an Ethernet PON system in which the packet scheduler is separated from the queues. In the proposed DBA algorithm, the OLT allocates bandwidth to the ONUs in proportion to the weight associated with their class and queue length, while the ONU preferentially allocates its bandwidth to queues with a static priority order. The proposed algorithm provides an efficient resource utilization by reducing the unused remaining bandwidth caused by the variable length of the packets. We also define the service classes and present control message formats conforming to the multi-point control protocol (MPCP) over an Ethernet PON. In order to evaluate the performance, we designed an Ethernet PON system on the basis of IEEE 802.3ah "Ethernet in the first mile" (EFM) using OPNET and carried out simulations. The results are analyzed in terms of the channel utilization, queuing delay, and ratio of the unused remaining bandwidth.
KSP Keywords
Channel Utilization, Control protocol, DBA Algorithm, Dynamic bandwidth allocation algorithm(DBA), Efficient resource allocation, Hierarchical DBA, IEEE 802, Message formats, Multimedia Service, Optical line terminal(OLT), Optical network unit(ONU)