{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"id":[{"id":"https:\/\/ror.org\/03mb6wj31","id-type":"ROR","asserted-by":"publisher"},{"id":"https:\/\/www.isni.org\/000000041937028X","id-type":"ISNI","asserted-by":"publisher"},{"id":"https:\/\/www.wikidata.org\/entity\/Q1640731","id-type":"wikidata","asserted-by":"publisher"}],"name":"Universitat Polit\u00e8cnica de Catalunya","acronym":["UPC"]}],"indexed":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T19:22:05Z","timestamp":1769628125836,"version":"3.49.0"},"reference-count":0,"publisher":"Universitat Polit\u00e8cnica de Catalunya","license":[{"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/3.0\/es\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Current network infrastructures are supported on a layered model whereby heterogeneous data traffic can be seamlessly transported. In this architecture, where client\/server relationships are established between adjacent layers, there exists an IP layer on top, two intermediate Asynchronous Transfer Mode (ATM) and Synchronous Digital Hierarchy (SDH) layers, and a Wavelength Division Multiplexing (WDM) layer at the bottom. Despite the benefits provided by the intermediate ATM and SDH layers (i.e., QoS and resilience), the complex interaction between them and the introduced overhead motivate an evolution towards a lighter model, where IP flows are directly sent through the WDM layer. In this new IP\/WDM model the functionalities formerly provided by the ATM and SDH layers are moved to the optical domain.\r\nFrom an operational perspective, the static nature of current transport networks, which leads to long service provisioning times (i.e., hours or days), becomes incompatible with the dynamic patterns associated to the prevalent IP traffic. To overcome these limitations, the ITU-T proposed the Automatically Switched Optical Network (ASON) architecture, which utilizes a control plane to provide fast and reliable lightpaths within the optical transport network. In addition, the Generalized Multi-Protocol Label Switching (GMPLS) model defined by the IETF appears as the most promising technology to implement the functionalities of the ASON control plane.\r\nAlthough being a significant advance towards flexible and easy-to-maintain transport network architectures, the ASON\/GMPLS paradigm still presents three major open issues that are addressed in this thesis.\r\nFirst, due to the coarse granularity offered by the WDM transport technology, established connections remain underused when sub-wavelength client flows must be transmitted. In light of this, a multi-layer approach, where different higher level data flows are aggregated in the IP layer and transmitted over the same optical path, appears as the most valid solution. Besides, the GMPLS technology is more than indicated to implement the control plane in this multi-layer architecture, since it allows the management of different switching technologies in an integrated way. In this regard, this thesis reports the experimental design and validation of a GMPLS-controlled multi-layer optical transport network.\r\nSecond, even though pure optical transmission enabled by WDM provides high bandwidth in a cost-effective way, it is also very sensitive to the physical layer impairments that affect to the transmitted optical signal and, thus, to the transported data. Hence, a control plane capable of managing physical layer information to provide feasible lightpaths becomes a must. This thesis introduces and experimentally evaluates different architectural solutions to implement an impairment-aware GMPLS-based control plane.\r\nFinally, as transport network infrastructures grow, they are typically segmented into domains due to administrative, technological, or scalability reasons. Furthermore, the interconnection of network infrastructures managed by different operators is mandated by the need to provide long distance connectivity. Here, confidentiality and reliability concerns become of paramount importance. All this justifies the need for multi-domain networks. In GMPLS-controlled multi-domain optical transport networks, this partitioning affects to end-to-end service provisioning, which is hindered by the reduced information exchange between domains resulting from the fulfillment of segmentation criteria. As the third goal of this thesis, different mechanisms for scalable and effective end-to-end service provisioning are proposed in this multi-domain scenario.<\/jats:p>\n                <jats:p>Les xarxes de comunicacions actuals segueixen un model distribu\u00eft de quatre capes que permet la transmissi\u00f3 de tr\u00e0fic de dades heterogeni de forma efica\u00e7 sobre la mateixa infraestructura de transport. En aquesta arquitectura, la capa superior correspon a la capa IP, seguida per dues capes interm\u00e8dies que s\u00f3n la capa ATM (Asynchronous Transfer Mode) i la capa SDH (Synchronous Digital Hierarchy) i, finalment, la capa WDM (Wavelength Division Multiplexing). Encara que les capes ATM i SDH proporcionen beneficis com qualitat de servei i protecci\u00f3 i restauraci\u00f3, tamb\u00e9 comporten una s\u00e8rie de problemes com interaccions complexes entre elles i un exc\u00e9s d'informaci\u00f3 de control. Aix\u00f2 fa necessari evolucionar cap a una arquitectura m\u00e9s lleugera on els fluxos IP es puguin enviar directament a trav\u00e9s de la capa WDM. En aquest nou model IP\/WDM les funcionalitats proporcionades inicialment per les capes ATM i SDH es traspassen al domini \u00f2ptic.Des d'un punt de vista operacional, la naturalesa est\u00e0tica del model en quatre capes fa que els temps de provisi\u00f3 de serveis siguin molt llargs (d'hores o dies) i, per tant, incompatibles amb els patrons de tr\u00e0fic IP que s\u00f3n altament din\u00e0mics. Per superar aquestes limitacions, la ITU-T va proposar l'arquitectura ASON (Automatically Switched Optical Network) que utilitza un pla de control per proporcionar connexions en la xarxa \u00f2ptica de forma r\u00e0pida i fiable. A m\u00e9s, la tecnologia GMPLS (Generalized Multi-Protocol Label Switching), definida per la IETF, apareix com el model m\u00e9s prometedor per implementar les funcionalitats del pla de control d'ASON.Tot i que el paradigma ASON\/GMPLS suposa un aven\u00e7 significatiu per aconseguir un model flexible i f\u00e0cil de mantenir, encara presenta una s\u00e8rie de limitacions que es tracten en aquesta tesi.Primer, degut a la granularitat de longitud d'ona oferida per la tecnologia de transport WDM, els circuits \u00f2ptics establerts queden infrautilitzats quan transmeten fluxos de dades de client de granularitat inferior. Per aquest motiu una soluci\u00f3 multi-capa, en la que aquests fluxos de client puguin ser agregats a la capa IP i despr\u00e9s transportats pel mateix circuit en la capa \u00f2ptica, sembla la m\u00e9s apropiada. A m\u00e9s, la tecnologia GMPLS resulta molt adient per implementar el pla de control en aquesta arquitectura multi-capa, ja que permet la gesti\u00f3 de diferents tecnologies de commutaci\u00f3 de forma integrada. En aquest context, aquesta tesi descriu el desenvolupament i validaci\u00f3 experimental d'una xarxa de transport \u00f2ptic multi-capa controlada per un pla de control GMPLS.En segon lloc, encara que la transmissi\u00f3 purament \u00f2ptica basada en WDM proporciona un gran ample de banda amb un cost redu\u00eft, tamb\u00e9 \u00e9s molt sensible als efectes negatius que afecten al senyal \u00f2ptic transm\u00e8s i, per tant, a la informaci\u00f3 transportada. En aquest context esdev\u00e9 necessari un pla de control que sigui capa\u00e7 de manegar la informaci\u00f3 associada a la capa \u00f2ptica. Aquesta tesi presenta i avalua de forma experimental diferents solucions per implementar un pla de control GMPLS amb gesti\u00f3 dels impediments f\u00edsics associats a la capa \u00f2ptica.Finalment, degut al creixement de les infraestructures de xarxa, aquestes s'acostumen a particionar ja sigui per raons tecnol\u00f2giques, administratives o d'escalabilitat. A m\u00e9s, la interconnexi\u00f3 entre dominis de diferents operadors, necess\u00e0ria per proporcionar connectivitat a llarga dist\u00e0ncia, implica problemes de confidencialitat entre operadors. Tot aix\u00f2 d\u00f3na lloc a les xarxes multi-domini. En xarxes \u00f2ptiques multi-domini controlades amb GMPLS, aquest particionat afecta a la provisi\u00f3 de serveis extrem a extrem, que es veu afectada pel limitat intercanvi d'informaci\u00f3 causat per la necessitat de satisfer els requeriments esmentats. El tercer objectiu d'aquesta tesi consisteix en proporcionar mecanismes de provisi\u00f3 de connexions extrem a extrem, escalables i efectius, en aquest escenari multi-domini.<\/jats:p>","DOI":"10.5821\/dissertation-2117-94698","type":"dissertation","created":{"date-parts":[[2023,10,11]],"date-time":"2023-10-11T01:52:36Z","timestamp":1696989156000},"approved":{"date-parts":[[2012,10,1]]},"source":"Crossref","is-referenced-by-count":0,"title":["Advanced routing mechanisms in ASON\/GMPLS networks"],"prefix":"10.5821","author":[{"sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fernando","family":"Agraz Bujan","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"3865","container-title":[],"original-title":[],"deposited":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T06:39:25Z","timestamp":1769582365000},"score":1,"resource":{"primary":{"URL":"https:\/\/hdl.handle.net\/2117\/94698"}},"subtitle":[],"editor":[{"given":"Jordi","family":"Perell\u00f3 Muntan","sequence":"first","affiliation":[],"role":[{"role":"editor","vocabulary":"crossref"}]},{"given":"Salvatore","family":"Spadaro","sequence":"additional","affiliation":[],"role":[{"role":"editor","vocabulary":"crossref"}]}],"short-title":[],"issued":{"date-parts":[[null]]},"references-count":0,"URL":"https:\/\/doi.org\/10.5821\/dissertation-2117-94698","relation":{},"subject":[]}}