2026-04-17T06:17:45Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/192502026-02-04T05:01:06Zcom_2072_1033col_2072_452950

Path-based recovery in flexgrid optical networks Castro Casales, Alberto Ruiz Ramírez, Marc Velasco Esteban, Luis Domingo Junyent Giralt, Gabriel Comellas Colomé, Jaume Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fibra òptica Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica Data transmission systems Computer networks Bitrate squeezed recovery Flexgrid Optical Networks Network Optimization Ordinadors, Xarxes d' Dades -- Transmissió With the advent of flexgrid optical networks, the rigid wavelength-division multiplexing (WDM) technology will be enhanced by providing better spectrum efficiency and flexibility. In those future flexible optical networks, optical connections (lightpaths) can allocate a flexible number of spectrum slices, also known as frequency slots, so to match better with its requested bitrate. In this paper, we propose to take advantage of this flexible spectrum allocation in recovery mechanisms to be triggered when a failure occurs to provide recovery of part of the requested bitrate, i.e. the allocated spectrum by backup lightpaths could be lower than that of the working lightpaths provided that client service level agreements are fulfilled. This reduction in the recovered bitrate (bitrate squeezing) allows optimizing the use of network capacity. We propose path-based recovery alternatives, based on protection and restoration, specially designed for flexgrid networks. The performance of the proposed recovery mechanisms is exhaustively evaluated on a national reference network Peer Reviewed Postprint (published version) 2012 Conference report http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6254479&contentType=Conference+Publications&sortType%3Dasc_p_Sequence%26filter%3DAND(p_IS_Number%3A6253703)%26rowsPerPage%3D100 Restricted access - publisher's policy IEEE