Towards optimum planning of GMPLS transport networks

The rapid increase in the number of wavelengths per fiber has significantly increased the size of Optical Crossconnects (OXCs) in WDM transport networks. This calls for the use of Multi-Granular OXCs (MG-OXCs) to maintain the scalability of OXCs at a reasonable level. Various MG-OXC architectures and methods for the planning (or dimensioning) of MG-OXC-based networks have been proposed. Motivated by the fact that the MG-OXC constitutes only the optical segment of GMPLS-based transport node, we first propose a new transport node architecture that can handle the whole traffic hierarchy defined in GMPLS. Second, incorporating the proposed architecture with our novel contributions, namely (1) considering grouping and switching of the whole flows defined in GMPLS; (2) allowing bifurcation of multi-granularity traffic demands among different physical routes, requires defining a new transport planning problem, which we call the Routing and Multi-Granular Paths Assignment (RMGPA) problem. The RMGPA problem is formulated as a Mixed Integer Linear Programming (MILP) model with the objective of minimizing the overall network weighted port count.

[1]  Chunming Qiao,et al.  A study of waveband switching with multilayer multigranular optical cross-connects , 2003, IEEE J. Sel. Areas Commun..

[2]  Maria C. Yuang,et al.  A Lagrangean relaxation approach to routing and wavelength assignment for multi-granularity optical WDM networks , 2004, IEEE Global Telecommunications Conference, 2004. GLOBECOM '04..

[3]  Eric Mannie,et al.  Generalized Multi-Protocol Label Switching (GMPLS) Architecture , 2004, RFC.

[4]  Rauf Izmailov,et al.  Nonuniform waveband hierarchy in hybrid optical networks , 2003, IEEE INFOCOM 2003. Twenty-second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37428).

[5]  H. T. Mouftah,et al.  A scalable design of multigranularity optical cross-connects for the next-generation optical Internet , 2003, IEEE J. Sel. Areas Commun..

[6]  Yongbum Kim,et al.  Design of hierarchical crossconnect WDM networks employing a two-stage multiplexing scheme of waveband and wavelength , 2002, IEEE J. Sel. Areas Commun..

[7]  E. Dotaro,et al.  Impact of intermediate traffic grouping on the dimensioning of multi-granularity optical networks , 2001, OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171).

[8]  Ayan Banerjee,et al.  Generalized multiprotocol label switching: an overview of routing and management enhancements , 2001, IEEE Commun. Mag..

[9]  H. T. Mouftah,et al.  Waveband routing and merging in hybrid optical networks , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).