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Periodic reconfiguration of the virtual topology in transparent optical networks has been recently investigated as a mechanism to more efficiently adapt the network to predictable periodic traffic variations along the day or week. The scheduling of periodic reconfigurations should consider the trade-off between a lower network cost obtained through better resource allocation, and the undesired traffic...
This paper addresses offline virtual topology design in transparent optical networks under given periodic traffic. We call this planning problem ldquoScheduled Virtual Topology Designrdquo. Two problem variants are considered: for a network based on non-reconfigurable equipment and for a network based on reconfigurable equipment. Two MILP (Mixed Integer Linear Program) formulations are proposed, one...
This paper presents the PI-OBS algorithm, a parallel-iterative scheduler for OBS nodes. Conventional schemes are greedy in the sense that they process headers one by one. In PI-OBS, all the headers received during a given time window are jointly processed to optimize the delay and output wavelength allocation, applying void filling techniques, and allowing traffic differentiation. Results show a similar...
Transparent optical networks are the enabling infrastructure for converged multi-granular networks in the future Internet. The cross-layer planning of these networks considers physical impairments in the network layer design. This is complicated by the diversity of modulation formats, transmission rates, amplification and compensation equipments, or deployed fiber links. Thereby, the concept of quality...
This paper surveys a set of relevant techniques proposed for traffic shaping in backbone OBS/OPS networks. The work is intended to fuel the near future research in the topic the authors will conduct within BONE project.
This paper presents the Dyn-MatPlanWDM tool, an educational network planning tool for wavelength-routing WDM networks. The tool considers the on-line or dynamic network operation. Traffic is composed of higher level traffic connections. The planning algorithms dynamically decide on the virtual topology design and the routing of the flows on top of it. The input parameters to the planning problem are...
This paper evaluates the performance of slotted Optical Packet Switching (OPS) switching fabrics under self-similar traffic. The issue of how to synthesize a realistic self-similar traffic pattern for OPS networks is discussed. As a result, a methodology for designing self-similar batch sources suitable for OPS networks is proposed. Then, a buffering dimensioning study of the switching fabric is conducted...
Packet order in slotted input buffer wavelength routed (IBWR) switches, operating under (i) synchronous optical packet switching (OPS), (ii) scattered wavelength path (SCWP) operational mode and (iii) fixed packet size, can be preserved by using a parallel iterative scheduler, as discussed in reference [1]. The performance achieved is comparable to the ideal output buffering architecture, degrading...
In this paper, the wire-speed packet processing issue is studied for optical packet/burst switching (OPS/OBS) switching nodes as well as for wavelength-routing (WR) switching nodes. Some assumptions are made to obtain simple estimates of the requirements in terms of forwarding events per second. This is compared with the packet processing performance of electronic devices which implement this type...
This paper surveys and analyzes the GMPLS extensions proposed for synchronous slotted optical packet switching (OPS) networks, from the point of view their impact on the switching node design. First, we examine the state-of-the-art in a set of GMPLS-aware functions. In the optical side, we focus on label coding and detection techniques. In the electronic side, we concentrate on ingress traffic buffering,...
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