Leandro Navarro

Leandro Navarro
Universitat Politècnica de Catalunya | UPC · Department of Computer Architecture (DAC)

PhD in Telecommunications

About

255
Publications
30,018
Reads
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1,767
Citations
Citations since 2016
62 Research Items
897 Citations
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Introduction
Leandro Navarro joined the Department of Computer Architecture at UPC as an associate professor in 1988, after receiving his graduate degree on Telecommunication Engineering from UPC. He received his Ph.D. from UPC in 1992. My research interests include the design of scalable and cooperative Internet services and applications. He is member of the ACM SIGComm, APC council, IFIP TC6 WG6.4, IEEE CS. He was a founding member of Pangea, and two spin-off companies: Espais Telemàtics, and Rededia.
Additional affiliations
July 2008 - June 2010
KTH Royal Institute of Technology
Position
  • Professor
July 2007 - August 2007
Swedish Institute of Computer Science
Position
  • Visiting researcher
October 1988 - present
Universitat Politècnica de Catalunya
Position
  • Professor (Associate)

Publications

Publications (255)
Chapter
The circular economy of computers is about producing fewer, more durable and reusable products while investing in expanding their life span through a functional service economy. Reuse is often mentioned as a sustainable solution to linear consumption’s negative impacts. Shared ownership has potential advantages in life span extension computers over...
Book
Full-text available
The world is facing an unprecedented climate and environmental emergency. Scientists have identified human activity as primarily responsible for the climate crisis, which together with rampant environmental pollution, and the unbridled activities of the extractive and agricultural industries, pose a direct threat to the sustainability of life on th...
Article
LoRa has emerged in recent years as a wireless technology providing long-range communication for low-power Internet-of-Things (IoT) devices. The LoRaWAN architecture adds the medium access control (MAC) and application layers, and defines a star of stars topology suitable for many and diverse IoT applications. However, in a number of scenarios, a m...
Article
Civilians in areas hit by earthquakes become in particular concerned about the safety of family and friends. However, outages in communications networks following these events limit their capacity to get information. So, people drive their cars to check on their loved ones, risking their own lives and hindering the activities of first response orga...
Chapter
Full-text available
We present the case of monitoring a decentralized and crowdsourced network infrastructure, that needs to be monitored over geographically distributed devices at the network edge. It is a characteristic of the target environment that both, the infrastructure to be monitored and the hosts where the monitoring system runs, change over time, and networ...
Conference Paper
Full-text available
By leveraging resources from the Fed4Fire+ CityLab testbed, we design the \textit{PiGeon} edge computing platform that experiments solution that enable ICN based edge services in wireless mesh networks (WMNs). PiGeon combines into a platform several trends in edge computing namely the ICN (Information-Centric Networking), the containerization of se...
Conference Paper
Full-text available
The Guifi.net community network has evolved during the past 15 years into a telecommunications infrastructure that offers Internet access to more than 80.000 people. The monitoring system currently in place for this network is lagging behind the growth of the infrastructure, requiring manual intervention and counting several single points of failur...
Conference Paper
Full-text available
Universal connectivity is still unavailable or expensive for half of the global population, despite being critical for social participation. The deployment of crowdsourced networking infrastructures creates an opportunity for local development, where anyone can deploy a new device. In such infrastructures connectivity offer can expand incrementally...
Article
How costs are distributed among the participants is a key question in the management and viability of shared resources. Although all cost-sharing mechanisms are subjective and thus it is eventually up to the participants to accept one or another, some general criteria seem desirable, such as being budget-balanced and that, in any case, a participan...
Chapter
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Crowdsourced mesh networks are built, maintained and used by several participants that cooperate to provide and consume connectivity. Providers of infrastructure want to get compensation for their investments and earn tokens; users or consumers want the network to expand for improving the coverage of connectivity and stability. How do we collect fu...
Article
Full-text available
The response conducted by emergency units after natural disasters, such as earthquakes, has to be coordinated, fast, and efficient in order to rescue and care for the victims, keeping all the population—and the units themselves—safe amidst the usual chaos. Outages in wireless networks, as well as fiber- or copper-based landline and Internet connect...
Chapter
Full-text available
The digital world demands a network infrastructure to supply connectivity to any participant anywhere. Sustainable networks require balanced value flows. Value is connectivity delivered at a material and service cost to compensate, involving diverse participants, ranging from consumers to providers, such as last mile access, regional transport, Int...
Conference Paper
Full-text available
Community-built telecommunication networks such as Guifi.net demonstrate how end users can actively collaborate in the self-provision of network services, for instance by operating a self-organized distributed monitoring system. Network monitoring is performed by many small servers at the users' premises but data are only accessible via a centraliz...
Conference Paper
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Modern large-scale networked services, such as video streaming, are typically deployed at multiple locations in the network to provide redundancy and load balancing. Different techniques are used to provide performance monitoring information so that client nodes can select the best service instance. One of them is collaborative sensing, where clien...
Article
Community networks are a growing network cooperation effort by citizens to build and maintain Internet infrastructure in regions that are not available. Adding that, to bring cloud services to community networks (CNs), microclouds were started as an edge cloud computing model where members cooperate using resources. Therefore, enhancing routing for...
Article
Full-text available
Edge computing is radically shaping the way Internet services are run by enabling computations to be available close to the users - thus mitigating the latency and performance challenges faced in today's Internet infrastructure. Emerging markets, rural and remote communities are further away from the cloud and edge computing has indeed become an es...
Article
Community Networks (CNs) are grassroots bottom-up initiatives that build local infrastructures, normally using Wi-Fi technology, to bring broadband networking in areas with inadequate offer of traditional infrastructures such as ADSL, FTTx or wide-band cellular (LTE, 5G). Albeit they normally operate as access networks to the Internet, CNs are ad-h...
Article
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Decentralization, in the form of mesh networking and blockchain, two promising technologies, is coming to the telecommunications industry. Mesh networking allows wider low‐cost Internet access with infrastructures built from routers contributed by diverse owners, whereas blockchain enables transparency and accountability for investments, revenue, o...
Conference Paper
In wireless community access networks, clients tend to reach the Internet through multiple gateway nodes instead of a single default gateway. The mapping of gateways to clients should take into account the perception of network performance from each client node. Network conditions and traffic load can fluctuate and make repeated client-gateway meas...
Preprint
There is interest in the deployment of cable and other networking infrastructure for private use in public land, but the lack of clear guidelines to regulate deployment in public land can block authorization decisions, which can be controversial due to the consequences of the private ownership and use of a private infrastructure in public space. Th...
Book
Full-text available
The 2018 edition of GISWatch focuses on local access models, specifically, community networks as self-organised, self-managed or locally developed solutions for local access, based on the conviction that one of the keys to affordable access is giving local people the skills and tools to solve their own connectivity challenges. Instead of buying an...
Preprint
Decentralization, in the form mesh networking and blockchain, two promising technologies , is coming to the telecommunications industry. Mesh networking allows wider low cost Internet access while blockchain enables complete transparency and accountability for investments and revenue or other forms of economic compensations from sharing of network...
Preprint
Full-text available
Decentralization, in the form mesh networking and blockchain, two promising technologies, is coming to the telecommunications industry. Mesh networking allows wider low cost Internet access while blockchain enables complete transparency and accountability for investments and revenue or other forms of economic compensations from sharing of network t...
Article
Full-text available
Community wireless mesh networks have emerged as cooperative initiatives to provide Internet Access in areas where traditional ISP costs are not affordable for the population. It is common in wireless mesh networks sharing several capacity limited Internet gateways to provide Internet access. As routing does not handle capacity planning, end-users...
Article
Commons are natural or human-made resources that are managed cooperatively. The guifi.net community network is a successful example of a digital infrastructure, a computer network, managed as an open commons. Inspired by the guifi.net case and its commons governance model, we claim that a computing cloud, another digital infrastructure, can also be...
Conference Paper
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Edge computing is shaping the way to run services in the Internet by allowing the computations to become available close to the user's proximity. Many implementations have been recently proposed to facilitate the service delivery in data centers and distributed networks. However, we argue that those implementations cannot fully support the operatio...
Conference Paper
Full-text available
Recently, mesh networking and blockchain are two of the hottest technologies in the telecommunications industry. Combining both can reformulate Internet access. While mesh networking makes connecting to the Internet easy and affordable, blockchain on top of mesh networks makes Internet access profitable by enabling bandwidth-sharing for crypto-toke...
Article
Routing in open and decentralized networks relies on cooperation. However, the participation of unknown nodes and node administrators pursuing heterogeneous trust and security goals is a challenge. Community-mesh networks are good examples of such environments due to their open structure, decentralized management, and ownership. As a result, existi...
Conference Paper
Owners of electronic devices typically decide whether or when they become e-waste or are still reusable. For a device in a commons model, where devices are collectively owned and managed, we propose restricting this individual choice in favour of the collective choice. This is achieved through external and internal organisational and governance ins...
Preprint
Full-text available
Recently, mesh networking and blockchain are two of the hottest technologies in the telecommunications industry. Combining both can reformulate internet access and make connecting to the Internet not only easy, but affordable too. Hyperledger Fabric (HLF) is a blockchain framework implementation and one of the Hyperledger projects hosted by The Lin...
Article
Full-text available
Recently, mesh networking and blockchain are two of the hottest technologies in the telecommunications industry. Combining both can reformulate internet access and make connecting to the Internet not only easy, but affordable too. Hyperledger Fabric (HLF) is a blockchain framework implementation and one of the Hyperledger projects hosted by The Lin...
Conference Paper
Full-text available
Recent years have seen a trend towards decentralisation - from initiatives on decentralized web to decentralized network infrastructures. In this position paper, we present an architectural vision for decentralising cloud service infrastructures. Our vision is on community cloud infrastructures on top of decentralised access infrastructures i.e. co...
Article
Full-text available
Recent years have seen a trend towards decentralisation - from initiatives on decentralized web to decentralized network infrastructures (e.g community networks). In this position paper, we present an architectural vision for decentralising cloud service infrastructures. Our vision is on the notion of community cloud infrastructures on top of decen...
Article
Community network (CN) initiatives have been around for roughly two decades, evangelizing a distinctly different paradigm for building, maintaining, and sharing network infrastructure but also defending the basic human right to Internet access. Over this time they have evolved into a mosaic of systems that vary widely with respect to their network...
Conference Paper
Citizens develop Wireless Mesh Networks (WMN) in many areas as an alternative or their only way for local interconnection and access to the Internet. This access is often achieved through the use of several shared web proxy gateways. These network infrastructures consist of heterogeneous technologies and combine diverse routing protocols. Network-a...
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In this forum we highlight innovative thought, design, and research in the area of interaction design and sustainability, illustrating the diversity of approaches across HCI communities. --- Lisa Nathan, Editor
Conference Paper
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Global access to the Internet for all requires a dramatic reduction in Internet access costs particularly in developing areas. This access is often achieved through several proxy gateways shared across local or regional access networks. These proxies allow individuals or organisations to share the capacity of their Internet connection with other us...
Conference Paper
Community networks have flourished around the world as a complementary model for enabling access to the Internet and its services. Nevertheless there is still an on-going debate on how to make them sustainable and scaleable beyond the voluntary effort and non-refundable contributions. The approach taken by Guifi.net has been to enable professional...
Conference Paper
Elastic resource provisioning is used to guarantee service level objectives (SLO) at reduced cost in a Cloud platform. However, performance interference in the hosting platform introduces uncertainty in the performance guarantees of provisioned services. Existing elasticity controllers are either unaware of this interference or over-provision resou...
Conference Paper
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The Internet and cloud services are key enablers for participation in society. The need for Internet access in areas underserved by commercial telecom operators has often been a motivation to develop community networks. Many examples around the world show successful cooperative developments of open, participatory local networking infrastructures. S...
Article
Beyond traditional telecom providers, citizens and organizations pool their own resources and coordinate in order to build local network infrastructures to address the digital divide in many parts of the world. These crowdsourced network infrastructures can be self-organized and shared by a community for the collective benefit of its members. Sever...
Article
Community networks are crowd-sourced IP networks that evolved into regional-scale computing platforms. This has led to adapting the cloud computing model for services that can operate and use computing resources inside a community network. The network and computing infrastructure is contributed by individuals, companies, organizations and maintaine...
Conference Paper
Full-text available
Circular economies are particularly relevant in the context of digital devices or electric and electronic equipment (EEE). Many digital devices built using scarce and potentially toxic materials have a too-short life, instead of being repaired or reused. In addition, informal recycling of electronics in the developed and developing world has emerge...
Chapter
Community cloud is a cloud deployment model in which a cloud infrastructure is built and provisioned for use by a specific community of consumers with shared concerns, goals, and interests, and is owned and managed by the community, or by a third party, or a combination of both. Community clouds are distinguished by the specific requirements of the...
Conference Paper
Wireless networks have shown to be a cost effective solution for an IP-based communication infrastructure in under-served areas. Services and application, if deployed within these wireless networks, add value for the users. This paper shows how cloud infrastructures have been made operational in a community wireless network, as a particular case of...
Conference Paper
Full-text available
Routing in open and decentralized networks relies on cooperation despite the participation of unknown nodes and node administrators pursuing heterogeneous trust and security goals. Living use cases for such environments are given by community-mesh networks due to their open structure and decentralized management and ownership. However, despite many...
Article
Full-text available
This work presents a technological analysis of guifi.net, a free, neutral, and open-access community network. Guifi.net consists of more than 27,000 operational nodes, which makes it the world’s largest community network in terms of the number of nodes and coverage area. This paper describes the characteristics of the network, the link level topolo...
Conference Paper
Full-text available
The advent of community networks has shown that citizens can take action not only at the technical level to expand the Internet but also at the governance level. What started as isolated and uncoordinated efforts to, mainly, bring connectivity to undeserved areas (using hacked WiFi devices -- the so called Wireless communities) has evolved into sel...
Conference Paper
Full-text available
Community networks are a potential model for the Future Internet, where the users form and operate the network instead of a central, commercial entity. The performance of parts of community networks has been studied extensively, often focusing on routing protocols or applications on top of community networks. This work focuses on the end-to-end qua...