On Providing QoS in Optical Burst Switching

Motivation and Need

Due to exceptional data rates, optical communication is becoming very popular. It has gained importance especially after the invention of wavelength division Multiplexing (WDM). WDM networks needs O-E-O conversion at each intermediate node. AONs (All Optical Networks) are preferred because they require no O-E-O conversion.

OBS is a promising solution for all optical WDM networks. It combines the benefits of Optical Packet Switching (OPS) and Optical Circuit Switching (OCS) while taking into account of the current all optical technology [3].

In OBS networks, signaling information is sent on separate control channel for setting up the path, after a preset time known as offset time ‘T' data burst is sent as shown in figue1. At the edge node packets for the same destination are assembled into one queue and a burst is formed based on the aggregation algorithm. It is then routed based on the scheduling algorithm. In this paper we discuss algorithms for aggregation and scheduling.

Bimodal Burst Switching (BBS) is a technique used in OBS to ensure a zero burst loss. It uses a delayed setup timed release scheme along with two mode of operations Mode0 & Mode1 [4]. Mode0 is applied on the edge nodes that are near to the Core nodes and Mode1 is applied to the edge nodes which are far away from the Core node

Current Progress

Principal Investigator
Dr S. M. H. Zaidi (Dean SEECS, Pakistan)

Graduate Researcher
Muhammad Usman Afzal, usman.afzal@seecs.edu.pk
Talha Imran, Talha.Imran@seecs.edu.pk