Virtual-topology adaptation for WDM mesh networks under dynamic traffic

Gencata, A.; Mukherjee, B.

doi:10.1109/infcom.2002.1019245

Cited by 71 publications

(90 citation statements)

References 15 publications

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“…The traffic intensities between node pairs is modeled for 24 hours, imitating several real network links as in [3]. While the traffic intensities gradually changes between node pairs, the lightpath loads are observed every 5 minutes.…”

Section: Numerical Examplesmentioning

confidence: 99%

Energy-aware virtual topology reconfiguration under dynamic traffic

Yayimli

Çavdar

2012

2012 14th International Conference on Transparent Optical Networks (ICTON)

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In an IP over WDM network architecture, IP traffic is carried over a virtual topology (VT), composed of optical transparent channels called lightpaths. We propose an energy-efficient dynamic VT adaptation method with sleep mode, which allows changing only one lightpath connectivity at a time by dynamically monitoring the IP packet traffic load on each lightpath. In order to assure the connectivity of future traffic increase a high-load threshold is used. When the packet traffic load on a specific lightpath becomes higher than a threshold, a new lightpath is added to the virtual topology. However this congestion avoidance policy increases the power consumption by activating transponders in the network. Therefore at the same time lightly loaded lightpaths are eliminated in the virtual topology by using a low-load threshold. Energy-efficient virtual topology adaptation is achieved by traffic offloading considering both lightly loaded and heavily loaded links in the network. In this regard, high-and low-load threshold values need to be carefully determined in order to both gain power and ensure load balancing with keeping the stability of virtual connectivity at a reasonable level.We have analysed the power consumption of the network during 48-hours for different values of low-and high-load thresholds together with the impact of different threshold values on the stability of the virtual topology. We have shown that there is a trade-off between number of changes in the virtual topology and the energy-efficiency. Experimental results demonstrate that a good compromise can be achieved by adjusting the high-and low-load thresholds carefully. Keywords: Energy-efficiency, IP over WDM networks, optical WDM networks, virtual topology reconfiguration, dynamic traffic. INTRODUCTIONInternet has become a significant part of our daily life leading to a rapid increase in traffic rates. Power consumption per user is continuously increasing although power consumption per bit is decreasing with the evolution of power efficient devices in telecommunication networks. In order to meet the requirements of this increasing traffic demands, today's optical wavelength division multiplexing (WDM) networks as a backbone transmission system, is designed to be over-dimensioned, with extra switching capacity and excess number of deployed links, taking into account the peak rates and future growth of the traffic, resulting in waste of energy.In an IP over WDM network architecture, IP traffic is carried over a virtual topology (VT), composed of optical transparent channels called lightpaths. In transparent optical networks, lightpaths are the most power consuming elements due to the electro-optical operations during the add/drop. Generally, the intensity of traffic on lightpaths follows a daily traffic profile, decreases during the early hours of the morning, starts to increase again after 9 am, and peaks during the daytime. In different time zones, the peak traffic intensities occur at different times, relative to a global clock reference...

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Section: Numerical Examplesmentioning

confidence: 99%

Energy-aware virtual topology reconfiguration under dynamic traffic

Yayimli

Çavdar

2012

2012 14th International Conference on Transparent Optical Networks (ICTON)

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“…However, in the last decade, the interest of the optical community has shifted to lightpath-based transparent optical networks [3], [8], [11]- [27]. Initial investigations on virtual topology reconfiguration consider solely the case of one-time adaptations.…”

Section: Related Workmentioning

confidence: 99%

“…Initial investigations on virtual topology reconfiguration consider solely the case of one-time adaptations. In such cases, a change in traffic is known and procedures adapt the existing VTD to this change, without considering periodic (multi-hour) traffic trends [8], [11]- [14]. In all these works, a common objective is to minimize the number of lightpath reconfigurations in the VTD so as to reduce disruptions in the traffic connections.…”

Section: Related Workmentioning

confidence: 99%

Heuristic Approaches for Periodic Reconfiguration of Lightpath-based Networks under Multi-hour Traffic

Aparicio-Pardo¹,

Garcia-Manrubia²,

Skorin-Kapov³

et al. 2012

JNW

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Abstract-Periodic lightpath reconfiguration of virtual topologies in transparent optical networks has been recently investigated as a mechanism to more efficiently adapt the network to predictable periodic traffic variations along a day or week. Scheduling periodic reconfigurations involves tuning a trade-off between a lower network cost obtained through better resource allocation, and undesired traffic disruptions that these reconfigurations may cause. This paper presents and compares two algorithms for planning a reconfigurable virtual topology suitable for exploring this trade-off. The first is based on a Lagrangean Relaxation of the planning problem, and the second is based on a Tabu Search meta-heuristic. The merits of both algorithms are assessed for moderate network sizes through comparison with analytical lower bounds and exact solutions obtained by a MILP formulation.Index Terms-virtual topology design, network planning, multi-hour traffic, Lagrangean Relaxation, Tabu Search.

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“…[26], [27], [7] and [29] treat the reconfiguration cost as the total number of lightpaths being added and removed during the reconfiguration. Though this simplistic model effectively compares the reconfiguration cost in migrating to two different virtual topologies, it fails to differentiate between the various possible reconfiguration schemes that can be used.…”

Section: Reconfiguration Costmentioning

confidence: 99%

Topology Reconfiguration with Successive Approximations

Baskaran

Llorca

Milner

et al. 2007

MILCOM 2007 - IEEE Military Communications Conference

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Topology control consists of computing new topologies to dynamically optimize the network under changing traffic conditions and then carrying out the reconfiguration process to achieve the target topology. This thesis considers the process of topology reconfiguration and use the packet drops that happen during this process as a cost metric for this process. It is shown that by implementing the topology reconfiguration as a series of smaller steps (successive approximation), the number of packets that are dropped during the reconfiguration are reduced. Using this knowledge, the topology computation algorithm can be refined to also minimize the reconfiguration cost along with the typical objective of minimizing congestion.

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Virtual-topology adaptation for WDM mesh networks under dynamic traffic

Cited by 71 publications

References 15 publications

Energy-aware virtual topology reconfiguration under dynamic traffic

Energy-aware virtual topology reconfiguration under dynamic traffic

Heuristic Approaches for Periodic Reconfiguration of Lightpath-based Networks under Multi-hour Traffic

Topology Reconfiguration with Successive Approximations

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