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Reconfiguration and Dynamic Load Balancing in Broadcast WDM Networks

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dc.contributor.author Baldine, I en
dc.contributor.author Rouskas, GN en
dc.date.accessioned 2014-03-01T01:48:42Z
dc.date.available 2014-03-01T01:48:42Z
dc.date.issued 1999 en
dc.identifier.issn 1387974X en
dc.identifier.uri http://hdl.handle.net/123456789/25575
dc.relation.uri http://www.scopus.com/inward/record.url?eid=2-s2.0-0033440877&partnerID=40&md5=d16b7622bf3a8b96a31f6e9435f0b842 en
dc.subject Broadcast optical networks en
dc.subject Dynamic load balancing en
dc.subject Reconfiguration en
dc.subject Wavelength division multiplexing (WDM) en
dc.title Reconfiguration and Dynamic Load Balancing in Broadcast WDM Networks en
heal.type journalArticle en
heal.publicationDate 1999 en
heal.abstract In optical WDM networks, an assignment of transceivers to channels implies an allocation of the bandwidth to the various network nodes. Intuition suggests, and our recent study has confirmed, that if the traffic load is not well balanced across the available channels, the result is poor network performance. Hence, the time-varying conditions expected in this type of environment call for mechanisms that periodically adjust the bandwidth allocation to ensure that each channel carries an almost equal share of the corresponding offered load. In this paper we study the problem of dynamic load balancing in broadcast WDM networks by retuning a subset of transceivers in response to changes in the overall traffic pattern. Assuming an existing wavelength assignment and some information regarding the new traffic demands, we present two approaches to obtaining a new wavelength assignment such that (a) the new traffic load is balanced across the channels, and (b) the number of transceivers that need to be retuned is minimized. The latter objective is motivated by the fact that tunable transceivers take a non-negligible amount of time to switch between wavelengths during which parts of the network are unavailable for normal operation. Furthermore, this variation in traffic is expected to take place over larger time scales (i.e., retuning will be a relatively infrequent event), making slowly tunable devices a cost effective solution. Our main contribution is a new approximation algorithm for the load balancing problem that provides for tradeoff selection, using a single parameter, between two conflicting goals, namely, the degree of load balancing and the number of transceivers that need to be retuned. This algorithm leads to a scalable approach to reconfiguring the network since, in addition to providing guarantees in terms of load balancing, the expected number of retunings scales with the number of channels, not the number of nodes in the network. en
heal.journalName Photonic Network Communications en
dc.identifier.volume 1 en
dc.identifier.issue 1 en
dc.identifier.spage 49 en
dc.identifier.epage 64 en


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