Abstract
With the ongoing steady traffic increase in the Internet, the wavelength usage of the supporting optical networks is a critical network efficiency parameter. Therefore, this paper suggests a way how to efficiently and economically achieve this goal in the context of optical burst switching, a very promising technology that has been proposed to overcome the shortcomings of conventional WDM deployment, such as lack of fine bandwidth granularity in wavelength routing and electronic speed bottlenecks in the presence of bursty traffic. In order to mitigate the burst loss and achieve high network efficiency we adapt the loss-less paradigm defined by Coutelen et al. (2010), i.e., the CAROBS framework. In classical OBS networks, the streamline effect ensures a very low level of contention, i.e., efficient transmission, hence we define a routing guided only by the streamline effect. The resulting routing problem is formulated as an optimization model which is solved using a decomposition technique to increase the scalability of the solution process.
Highlights
In recent years, servers in data centers providing multimedia content were the main drivers of rapid increase of consumed bandwidth in the Internet [1]
The traffic performance parameters we look at are the burst buffering probability (BBP), access delay (ACC) which informs how much of time is necessary in order to wait prior the output wavelength and port is again ready for another burst train sending, buffering delay (BD) which provides information for how long each burst train is stored in the electrical memory, and end to end delay (E2E) which does not contain propagation delay because our focus is to show the system performance
The maximal configuration utilization is higher than 70 % which is significantly higher than what is possible to achieve in optical circuit switching (OCS) networks that are based on link-disjoint traffic property [3]
Summary
Servers in data centers providing multimedia content were the main drivers of rapid increase of consumed bandwidth in the Internet [1]. The sources of this bandwidth requirement increase are no longer computers and smart devices, but the applications that run on smart devices [1] This trend accelerates the need for fast and reliable switching technology to support this new traffic. Bypass is used in optical networks to allow switching a light beam between any two ports of an optical cross connect (OXC) without electronic processing. Based on this principle, the three main alloptical paradigms emerged: optical circuit switching (OCS), optical packet switching (OPS), and optical burst switching (OBS). Our focus is the wavelength efficiency of the OBS loss-less architecture proposed by Coutelen et al, the CAROBS framework [6].
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