A Novel Contention Resolution Scheme for Optical Burst Switching Network

摘要

Optical burst switching (OBS) is a promised newly technology to implemented the all-optical transmission for Internet protocol (IP) traffic. How to effectively resolve the burst contention at the core router and propose a QoS (Quality of Service) supported burst assembly technique is a critical issue in nowadays. In this paper, a novel burst contention resolution scheme for OBS network has been proposed, this scheme based on two main aspects. Firstly, we propose a new burst segmentation approach named both-direction-segmentation (BDS), which could subtly take the advantages of burst head-segmentation and burst tail-segmentation approach. Secondly, corresponding to BDS, a novel burst assembly technique, which we called hybrid burst assembly (HBA) also has been proposed. Different from several existing burst assembly techniques, which only protect high-priority bursts. HBA has also been considered to protect the relatively high-class packets in low-priority bursts. A simulation is given out at the end of this paper, we observe that the proposed contention resolution scheme not only could minimize the losing of packets remarkably but also could efficiently and veritably support QoS for OBS network. The results have some valuable theoretic significances to design the real network in practice.