http://hdl.handle.net/2117/3134 2013-05-23T22:02:04Z http://hdl.handle.net/2117/12917 Title: A HW/SW codesign-based reconfigurable environment for telecommunication network simulation Authors: Noguera, Juan José; Badia Sala, Rosa Maria; Domingo Pascual, Jordi; Solé Pareta, Josep Abstract: Sequential network simulation is a high time-consuming application, and with the emergence of global multihop networks and gigabit-per-second links is becoming a challenging problem. A new approach to this open problem is presented, based on HW/SW co-design. A complete modular and scalable reconfigurable system architecture is explained. Most important features of this simulation framework are: (1) efficient and flexible network simulation, and (2) transparent use of the reconfigurable system by telecommunication networks engineers because of the use of a high level network modeling language. 2011-07-11T11:14:56Z http://hdl.handle.net/2117/10774 Title: A performance overview of quality of service mechanisms in optical burst switching networks Authors: Klinkowski, Miroslaw; Careglio, Davide; Solé Pareta, Josep; Marciniak, Marian Abstract: This Chapter addresses the problem of quality of service (QoS) provisioning in optical burst switching (OBS) networks. OBS is a photonic network technology aiming at efficient transport of IP traffic. The lack of optical memories, however,makes the operation in such networks quite complicated, especially if one wants to guarantee a certain level of service quality. Indeed quality demanding applications such as, for instance, real-time voice and video transmissions, need for additionalmechanisms so that to preserve them from low priority data traffic. In this context the burst blocking probability metric is perhaps of the highest importance in OBS networks. In this Chapter we present a general classification of QoS provisioning methods considered for OBS networks.We study several QoS scenarios that are based on the most referenced QoS mechanisms and we confront their performance in the same evaluation scenario consisting of a single isolated node. Among all the mechanisms analysed, the best overall performance is achieved with a burst preemptive mechanism. Since the preemptive mechanism produces the problem of resources overbooking in the network we address this issue as well. 2010-12-28T10:18:06Z http://hdl.handle.net/2117/10773 Title: Performance issues in Optical Burst/Packet Switching Authors: Klinkowski, Miroslaw; Careglio, Davide; Aracil Rico, Javier; Azodolmolky, Siamak; García Haro, Juan; Gunreben, Sebastian; Hu, Guoqiang; Izal, Mikel; Kimsas, Andreas; Veiga Gontán, Javier; Tzanakaki, Anna; Tomkos, Ioannis; Spadaro, Salvatore; Scharf, Joachim; Perelló Muntan, Jordi; Pavón Mariño, Pablo; Morató, Daniel; Magaña, Eduardo; Köhn, Martin Abstract: This chapter summarises the activities on optical packet switching (OPS) and optical burst switching (OBS) carried out by the COST 291 partners in the last 4 years. It consists of an introduction, five sections with contributions on five different specific topics, and a final section dedicated to the conclusions. Each section contains an introductive state-of-the-art description of the specific topic and at least one contribution on that topic. The conclusions give some points on the current situation of the OPS/OBS paradigms. 2010-12-28T10:00:49Z http://hdl.handle.net/2117/10771 Title: Introduction to IP over WDM Authors: Spadaro, Salvatore; Careglio, Davide; Aracil Rico, Javier; Fernández Palacios, Juan; Jajszczyk, Andrzej; Larrabeiti, David; López, Victor; Masip Bruin, Xavier; Sánchez López, Sergio Abstract: The simple idea of having IP traffic directly transported over optical Wavelength Division Multiplexing (WDM) technology (“Internet Protocol (IP) over WDM”) has been envisioned as the future for the telecommunication infrastructure. The key point in this infrastructure becomes the switching layer between ubiquitous IP-centric networks and WDM physical layer. An intense debate has been ongoing about which model to adopt, aiming at identifying the degree of optical transparency and the proper flexibility of optical interconnection. Expected migration of switching functions from electronic to optics will be gradual, and will take place in several phases. The first phase is presented in this chapter. It is characterised by the use of the wavelength as a switching granularity; the terms optical circuit switching (Optical Circuit Switching (OCS)), wavelength switching and wavelength routed network are commonly and indifferently used. 2010-12-28T09:39:34Z