상세정보
학술지
Hierarchical Dynamic Bandwidth Allocation Algorithm for Multimedia Services over Ethernet PONs
- 저자
- 안계현, 한경은, 김영천
- 발행일
- 200408
- 출처
- ETRI Journal, v.26 no.4, pp.321-331
- ISSN
- 1225-6463
- 출판사
- 한국전자통신연구원 (ETRI)
- 협약과제
- 03MT1600, 고속LAN 기술 표준화 연구, 정해원
- 초록
- 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 제안 키워드
- 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)