Enhanced Class-of-Service Oriented Packet Scheduling Scheme for EPON Access Networks

Intark HAN  Hong-Shik PARK  Man-Soo HAN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E91-B    No.10    pp.3334-3337
Publication Date: 2008/10/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.10.3334
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fiber-Optic Transmission for Communications
Keyword: 
dynamic bandwidth allocation,  Ethernet passive optical network,  mean delay,  service fairness,  

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Summary: 
A fast class-of-service oriented packet scheduling (FCOPS) has a service fairness problem since a credit pool for a service class is initialized at the beginning of a transmission cycle whose starting moment is fixed at a specific ONU. To remedy the service unfairness of FCOPS, we suggest an enhanced class-of-service oriented packet scheduling (ECOPS) that uses a new initialization cycle whose starting moment is fairly distributed to each ONU. Also, ECOPS generates a colorless grant to utilize the resource wastage, when traffic is light and the total sum of grants of an ONU is less than a minimum size. Using simulation, we validate ECOPS as superior to FCOPS in the mean delay and the service fairness.