Xavier Vilajosana

Learn More
We have witnessed the Fixed Internet emerging with virtually every computer being connected today; we are currently witnessing the emergence of the Mobile Internet with the exponential explosion of smart phones, tablets and net-books. However, both will be dwarfed by the anticipated emergence of the Internet of Things (IoT), in which everyday objects are(More)
The OpenWSN project is an open-source implementation of a fully standards-based protocol stack for capillary networks, rooted in the new IEEE802.15.4e Time Synchronized Channel Hopping standard. IEEE802.15.4e, coupled with Internetof-Things standards, such as 6LoWPAN, RPL and CoAP, enables ultra-low power and highly reliable mesh networks which are fully(More)
Industrial low-power wireless mesh networks are shifting towards time-synchronized medium access control (MAC) protocols which are able to yield over 99.9% end-to-end reliability and radio duty cycles well below 1%. In these networks, motes use time slots to communicate, and neighbor motes maintain their clocks' alignment, typically within 1 ms.(More)
The quick proliferation of LPWAN networks, being LoRaWAN one of the most adopted, raised the interest of the industry, network operators and facilitated the development of novel services based on large scale and simple network structures. LoRaWAN brings the desired ubiquitous connectivity to enable most of the outdoor IoT applications and its growth and(More)
Urban living is beginning to take a central role in the direction in which humanity is evolving. Today, more than half the population is living in urban environments [1]; the related efforts to facilitate viable living conditions are tremendous [2]; and, to make matters worse, the effect of urbanization on the global climate has come into the limelight [3].(More)
This document presents a new work called 6TSCH that is starting at the IETF to enable a large IPv6 multi-link subnet with industrial-grade performances of jitter, latency and reliability. The subnet is composed of a high speed powered backbone and a number of IEEE802.15.4e TSCH wireless mesh networks attached and synchronized by specialized Backbone(More)
Steel mills, oil refineries, and offshore drilling platforms implement complex industrial processes, which require a tight control and a scalable diagnostic transport. Thousands of sensing points are used to report temperature, pressure, and tank fill levels to an industrial process control center. This center, either in an automated way or through human(More)
Dear MMTC colleagues: It is really a great honor for me to serve as the Asia vice-chair for this vital ComSoc Committee during the period 2014-2016! As part of my duties, I have contributed to the initial setting of the Interest Groups (IGs) and I am starting to work on the promotion of Special Issues (SIs)/symposiums/workshops with top(More)
In this paper we present SR-1, a simulation-based heuristic algorithm for the Capacitated Vehicle Routing Problem (CVRP). Given a CVRP instance, SR-1 uses an initial "good solution", such as the one provided by the classical Clarke and Wright heuristic, in order to obtain observations for the variable "distance between two consecutive nodes in a route".(More)