Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

SLA Formulation for Squeezed Protection in Elastic Optical Networks Considering the Modulation Format

Full text
Assis, K. D. R. [1] ; Almeida, Jr., R. C. [2] ; Waldman, H. [3] ; Santos, A. F. ; Alencar, M. S. ; Reed, M. J. [4] ; Hammad, A. [5] ; Simeonidou, D. [5]
Total Authors: 8
[1] Fed Univ Bahia UFBA, Dept Elect Engn, Salvador, BA - Brazil
[2] UFPE Univ Fed Pernambuco, Dept Elect & Syst, Photon Grp, Recife, PE - Brazil
[3] State Univ Campinas Unicamp, Dept Elect Engn, Campinas, SP - Brazil
[4] Essex Univ, Sch Comp Sci & Elect Engn, Colchester, Essex - England
[5] Univ Bristol, High Performance Networks Grp HPN, Bristol, Avon - England
Total Affiliations: 5
Document type: Journal article
Web of Science Citations: 1

In spectrum-sliced elastic optical path networks (SLICE), the lightpath bandwidth is variable, and the virtual topology overlay on a physical topology shall be designed to optimize the spectrum utilization. Under static traffic, SLICE networks are typically designed through a mixed integer linear programming (MILP) with the aim of minimizing the spectrum utilization. In this paper, a new MILP formulation for protection in SLICE networks is proposed, which uses the concept of bandwidth squeezing and grooming to guarantee a minimum agreed bandwidth for each source -destination pair in the surviving bandwidth. The route for each demand on the physical topology is determined by balance equations together with physical layer constraints in the formulation, so that no pre-calculated routes are required and the modulation format of each established lightpath may be chosen with enough quality of transmission and to save network spectrum. Therefore, the proposed formulation jointly solves the virtual topology design and physical topology design problems. The first results evaluate the effectiveness of the MILP formulation for two small networks when connections are under different service-level agreement (SLA) requirements and are provisioned by an appropriate protection scheme and different modulation formats. Due to the NP-hard nature of the proposed MILP formulation, a heuristic algorithm for moderately large networks is also proposed. Case studies are carried out to analyze the basic properties of the formulation and the performance of the proposed heuristic. With the proposed formulation, it is possible to identify the configurations that ensure minimum spectrum occupation with different kinds of protection for each lightpath. Different kinds of modulation formats are considered and contrasted to the benchmark case of a single modulation format and using the same kind of protection for all lightpaths. (AU)

FAPESP's process: 15/24341-7 - New strategies to confront with the threat of capacity exhaustion
Grantee:Helio Waldman
Support type: Research Projects - Thematic Grants