TY - JOUR

T1 - Drop cost and wavelength optimal two-period grooming with ratio 4

AU - Bermond, Jean Claude

AU - Colbourn, Charles

AU - Gionfriddo, Lucia

AU - Quattrocchi, Gaetano

AU - Sau, Ignasi

PY - 2010

Y1 - 2010

N2 - We study grooming for two-period optical networks, a variation of the traffic grooming problem for wavelength division multiplexed (WDM) ring networks introduced by Colbourn, Quattrocchi, and Syrotiuk. In the two-period grooming problem, during the first period of time there is all-to-all uniform traffic among n nodes, each request using 1/C of the bandwidth; and during the second period there is all-to-all uniform traffic only among a subset V of v nodes, each request now being allowed to use 1/C′ of the bandwidth, where C′ < C. We determine the minimum drop cost (minimum number of add-drop multiplexers (ADMs)) for any n,v and C = 4 and C′ ∈ {1,2,3}. To do this, we use tools of graph decompositions. Indeed the two-period grooming problem corresponds to minimizing the total number of vertices in a partition of the edges of the complete graph Kn into subgraphs, where each subgraph has at most C edges and where furthermore it contains at most C′ edges of the complete graph on v specified vertices. Subject to the condition that the two-period grooming has the least drop cost, the minimum number of wavelengths required is also determined in each case.

AB - We study grooming for two-period optical networks, a variation of the traffic grooming problem for wavelength division multiplexed (WDM) ring networks introduced by Colbourn, Quattrocchi, and Syrotiuk. In the two-period grooming problem, during the first period of time there is all-to-all uniform traffic among n nodes, each request using 1/C of the bandwidth; and during the second period there is all-to-all uniform traffic only among a subset V of v nodes, each request now being allowed to use 1/C′ of the bandwidth, where C′ < C. We determine the minimum drop cost (minimum number of add-drop multiplexers (ADMs)) for any n,v and C = 4 and C′ ∈ {1,2,3}. To do this, we use tools of graph decompositions. Indeed the two-period grooming problem corresponds to minimizing the total number of vertices in a partition of the edges of the complete graph Kn into subgraphs, where each subgraph has at most C edges and where furthermore it contains at most C′ edges of the complete graph on v specified vertices. Subject to the condition that the two-period grooming has the least drop cost, the minimum number of wavelengths required is also determined in each case.

KW - Design theory

KW - Graph decomposition

KW - Optical networks

KW - SONET ADM

KW - Traffic grooming

UR - http://www.scopus.com/inward/record.url?scp=77954481345&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77954481345&partnerID=8YFLogxK

U2 - 10.1137/080744190

DO - 10.1137/080744190

M3 - Article

AN - SCOPUS:77954481345

SN - 0895-4801

VL - 24

SP - 400

EP - 419

JO - SIAM Journal on Discrete Mathematics

JF - SIAM Journal on Discrete Mathematics

IS - 2

ER -