The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Ring-Mesh Topology Optimization in Designing the Optical Internet

생존성을 보장하는 링-그물 구조를 가진 광 인터넷 WDM 망 최적 설계

  • Published : 2004.04.01
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Abstract

In this paper, we deal with a ring-mesh network design problem arising from the deployment of WDM for the optical internet. The ring-mesh network consists of ring topology and full mesh topology for satisfying traffic demand while minimizing the cost of OAOMs and OXCs. The problem seeks to find an optimal clustering of traffic demands in the network such that the total number of node assignments is minimized, while satisfying ring capacity and node cardinality constraints. We formulate the problem as a mixed-integer programming model and prescribe a tabu search heuristic procedure Promising computational results within 3% optimality gap are obtained using the proposed method.

이 논문은 파장 분할 다중화 (Wavelength Division Multiplexing, WDM) 기술의 링-그물 구조를 가진 망을 설계하는 알고리즘을 제시한다. 링-그물 망을 설계하는 문제는 OADM과 OXC 비용을 최소로 하면서 트래픽을 만족시키는 그물 라우팅과 링 토폴로지를 설계한다. 링 토폴로지는 OADM으로 구성되어 링 내의 노드간 트래픽을 처리하고, 그물 라우팅은 서로 다른 링에 있는 노드간에 발생하는 트래픽을 OXC를 이용해서 처리한다. 링 토풀로지와 그물 라우팅 문제를 동시에 해결하기 위해서 정수 계획법 (Integer Programming) 모델을 개발한다. 링-그물 문제는 NP-Hard이므로 실제 크기의 망 문제에서 주어진 시간내 좋은해를 생성하는 효과적인 타부 서치 휴리스틱을 제안한다. 타부 서치 휴리스틱 성능을 상업용 소프트웨어인 CPLEX 7.0 으로 구한 해와 비교한 결과 5초 내에 총비용의 오차 범위가 3% 이내인 우수해를 구한다.

Keywords

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