J. Paradells

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Real world MANET routing protocol implementations generally use layer three mechanisms for carrying out connectivity maintenance tasks. In many cases, such mechanisms are based on periodical transmission of Hello messages. When topology changes occur frequently, usage of higher Hello rates than default may lead to higher end-to-end connectivity and(More)
In this paper a statistical model of the call holding time in Public Access Mobile Radio) PAMR systems is presented. For this purpose a scanning receiver has been used to monitor the call duration, and the Kolmogorov-Smirnov test has been applied to measure the goodness of fit of the candidate distributions. The exponential distribution often used to model(More)
One of the fields in which companies are investing more money is security, either personal security to avoid industrial accidents or security against intrusions. There is also the huge effort that the scientific community is doing developing all required protocols and standards to make Wireless Sensor Networks (WSN) extensive commercial. Moreover, one(More)
Wireless sensor networks have paved the way to a new era in user applications, where information can be sensed, processed, and distributed from remote environments with minimal or no human interaction. As the sensor nodes in these networks are often battery-operated and communicate wirelessly, they are constrained by limited resources such as bandwidth,(More)
In cellular and wireless local area networks, wireless communication only occurs on the last link between a base station and the wireless end system. In multi-hop wireless networks there are one or more intermediate nodes along the path that receive and forward packets via wireless links. Multi-hop wireless networks have several benefits: Compared to(More)
In this paper a procedure to approximately calculate the mean waiting time in the M/H 2 /s queue is presented. The approximation is heuristic although based in the intuitive symmetry between the deterministic and balanced hyperexponential-2 distributions. The three parameters which fully describe the H 2 distribution are considered, so the approximation can(More)
Transversal: CE3. Ability to implement wired/wireless systems, in both fix and mobile communication environments. CE4. Ability to design and dimension transport, broadcast and distribution networks for multimedia signals CE6. Ability to model, design, implement, manage, operate, administrate and maintain networks, services and contents CE7. Ability to plan(More)
Resum Un dels mètodes més prometedors per a la comunicació amb una major eficiència energètica en les Xarxes de Sensors Sense fil (Wireless Sensor Networks-WSN) és l'ús de wake-up receivers en el node receptor. Els wake-up receivers són dispositius d'ultra-baix consum de potència connectats al node sense fil que li permeten romandre en estat inactiu mentre(More)