An Opportunistic Burst Cloning Scheme for Optical Burst Switching over Star Networks

Salek Riadi, Abdelilah Maach, Driss El Ghanami

Abstract


In optical burst switched (OBS) networks, burst loss is mainly due to contention that occurs at both edge and core node. At edge node, contending burst may be electronically queued. Whereas at core node, which lacks of optical memory and wavelength conversion capability, contending burst will be dropped. Burst cloning prevents burst loss at core nodes by sending multiple copies of the same burst through OBS network simultaneously in order to enhance probability that at least one copy will reach destination. However, at high load, burst cloning leads to a significant burst loss at edge nodes, which become unable to schedule new bursts at earliest tolerable departure time. In this paper, we adopt burst cloning scheme with star topology and we propose an opportunistic burst cloning scheme, which aims to control the extra load of burst cloning in order to reduce burst loss at both edge and core node. We perform both analytical and simulation analyses on conventional OBS, basic burst cloning scheme and opportunistic burst cloning scheme over star networks. We observe that opportunistic burst cloning scheme achieves better overall network performance than the other approaches.

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References


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