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Instituto Superior Técnico


Deployment Issues of a Large Scale Vehicular Network

Susana Sargento

Susana Sargento: IT & University of Aveiro

Abstract: Seeking to explore the extent to which a vehicular mesh network can serve as a reliable and secure wireless infrastructure for mobile Internet access and the Internet of Things at street level, we built a city-scale testbed comprised of 404 connected public transit buses, 25 municipal service vehicles (garbage trucks) and 47 roadside units. This experimental platform is currently providing free WiFi to passengers in the city of Porto, Portugal. Moreover, these vehicles gather large amounts of data not just from their own sensors and the devices of the bus passengers, but also from other wireless devices that are spread around the city.

This talk describes this unique large-scale vehicular network infrastructure and the deployment issues that were faced while deploying and running the testbed, both from the large-scale complexity and the real-world aspects of dealing with uncontrolled environments.

Short bio: Susana Sargento (\url{}) is an Associate Professor with ``Habillitation'' in the University of Aveiro and the Institute of Telecommunications, where she is leading the Network Architectures and Protocols (NAP) group ( She received her PhD in 2003 in Electrical Engineering in the University of Aveiro (with a 7 months stay in Rice University in 2000 and 2001). She joined the Department of Computer Science of the University of Porto between 2002 and 2004, and she was a Guest Faculty of the Department of Electrical and Computer Engineering from Carnegie Mellon University, USA, in August 2008, where she performed Faculty Exchange in 2010/2011. In March 2012, Susana has co-founded a vehicular networking company, Veniam (\texttt{}), a spin-off of the Universities of Aveiro and Porto, which builds a seamless low-cost vehicle-based internet infrastructure.

She has more than 15 years of experience in technical leadership in many national and international projects, and worked closely with telecom operators and OEMs. She has been involved in several FP7 projects (4WARD, Euro-NF, C-Cast, WIP, Daidalos, C-Mobile), EU Coordinated Support Action 2012-316296 "FUTURE-CITIES", national projects, and CMU-Portugal projects (DRIVE-IN with the Carnegie Melon University). As an example, in IST-Daidalos, a 30M€ project, she was the leader of two main activities (QoS and ad-hoc networks). In FUTURE-CITIES she was responsible for implementing the network of vehicles on buses and trucks, as well as several fixed stations, counting this time with more than 600 vehicles in the city of Porto, Portugal. The Smart Cities infrastructure in Porto is composed by the vehicular network, denoted as CityNet, and a sensing infrastructure, denoted as UrbanSense, to provide a low-cost and large range communication support all over the city. The CityNet is a city-scale vehicular platform comprised of 404 connected buses, 25 municipality vehicles and 25 road-side units connected via IEEE 802.11p wireless vehicular technology, which currently provides Internet WiFi access to thousands of passengers in the city of Porto. The UrbanSense is the sensing infrastructure in the city, with 25 fixed sensors in the street and mobile sensors in buses, monitoring luminosity, temperature and pollution.

She has been TPC-Chair and organizing several international conferences and workshops, such as ACM MobiCom 2009 Workshop CHANTS, IEEE Globecom and IEEE ICC. has also been a reviewer of numerous international conferences and journals, such as IEEE Wireless Communications, IEEE Networks, IEEE Communications.

Her main research interests are in the areas of self-organized networks, in ad-hoc and vehicular mechanisms and protocols, such as routing, mobility, security and delay-tolerant mechanisms, resource management and virtualization in both network and cloud resources, and content distribution networks.

Susana is the winner of the 2016 EU Prize for Women Innovators (\url{}).

Ultra-scalable Transactional Databases Made Practical

Rui Oliveira

Rui Oliveira: INESC TEC & University of Minho

Abstract: Databases are at the core of any information system. They are the bulwark of data, the stock for computation and, as often as not, an active part of the applications themselves. The dependability and scalability of database management systems are therefore crucial and have been active topics of research for the last four decades.

Replication is key to these goals as it can provide redundancy for both fault tolerance and scale out. However, twenty years ago, Jim Gray et al. deemed a scalable general-purpose one-copy equivalent database unattainable. In their system and transactional models, replication leads to the exponential growth of conflicts, response times and deadlocks. This result sparked great interest in the search for solutions or workarounds both in the database and distributed systems communities.

In this talk, we show how database replication techniques, basic services and rules of thumb from distributed systems research have since then conspired towards a fault-tolerant transactional database management system capable of scaling-out to hundreds of nodes.

Such an ultra-scalable database can handle increasing operational workloads as well as gracefully cater for resource-intensive analytic queries in real-time. An infrastructure to serve at the core of the emerging Internet of Everything... and beyond.

Short bio: Rui Oliveira graduated in Electrotechnic and Computers Engineering, by the University of Porto, has a Master in Computer Science by the University of Minho and a PhD in Computer Science by The École Polytechnique Fédérale de Lausanne. He is Associate Professor at the Informatics Department of University of Minho, researcher at the High Assurance Software Laboratory of INESC TEC and Univeristy of Minho, member of the board at INESC TEC, and Head of Research at LeanXcale.

His research interests are on large scale distributed systems, in particular on fault-tolerant agreement protocols, epidemic communication and on exascale data management. Application of his group research has been on scalable distributed database systems and on dependable cloud data storage and processing.

He has published regularly in conferences such as IEEE Dependable Systems and Networks, IEEE Symposium on Reliable Distributed Systems, IEEE International Parallel \& Distributed Processing Symposium, IFIP International Conference on Distributed Applications and Interoperable Systems as well as in the IEEE Transactions on Computers. He serves on the steering committees of IEEE SRDS, IFIP/ACM/USENIX Middleware and IFIP DAIS. He is vice-chair of IFIP WG 6.1.

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