Browsing by Author "Oliver Riera, Miquel"

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  • A comparative survey of adaptive codec solutions for VoIP over multirate WLANs: a capacity versus quality performance trade-off
    Sfairopoulou, Anna; Bellalta, Boris; Macián, Carlos; Oliver Riera, Miquel (Springer Verlag, 2010)
    In multi-rate WLANs, users can suffer transmission rate changes due to the link adaptation mechanism. This results in a variable capacity channel, which is very hostile for VoIP and can cause serious quality of service ...
  • A cross-layer mechanism for QoS improvements in VoIP over multi-rate WLAN networks
    Sfairopoulou, Anna (Universitat Pompeu Fabra, 2011-04-12)
    In IEEE 802.11 WLANs, Link Adaptation mechanisms, which choose the transmission rate of each node, provoke unexpected and random variations on the effective channel capacity. When these changes are towards lower bitrates, ...
  • A Guidance for blockchain-based digital transition in supply chains
    Della Valle, Fabio; Oliver Riera, Miquel (MDPI, 2021)
    Blockchains play a crucial role in the digitalization of future supply chains (SCs). In this study, we analyzed the major influences that blockchain-based digital business strategies may play in SC operations. We conducted ...
  • A hierarchical framework for peer-to peer systems: design and optimizations
    Sánchez Artigas, Marc (Universitat Pompeu Fabra, 2011-04-12)
    En los últimos años, las redes peer-to-peer (P2P) ha experimentado una fuerte expansión. Estos sustratos se constituyen en forma de redes overlay o de recubrimiento que interconectan usuarios de manera lógica y desacoplada ...
  • A low power listening with wake up after transmissions MAC protocol for WSNs
    Cano Bastidas, Cristina (Universitat Pompeu Fabra, 2011-05-16)
    In the last few years Wireless Sensor Networks (WSNs) have become an interesting field of research mainly due to the challenges and constraints of their design and the broad range of potential applications they can provide. ...
  • A self-organizing management platform for wireless sensor networks
    Cao Minh, Trang (Universitat Pompeu Fabra, 2014-10-14)
    Through advances in sensor, networking, semiconductor and energy storage technologies, Wireless Sensor Networks (WSNs) are increasingly being deployed in many important applications to enable users to access information ...
  • An approximate queueing model for multi-rate multi-user MIMO systems
    Bellalta, Boris; Daza, Vanesa; Oliver Riera, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    A queueing model for Multi-rate Multi-user MIMO systems is presented. The model is built upon the assumption that the probability distribution of available destinations among the buffered frames at the Base Station (BS) ...
  • Are higher education students registering and participating in MOOCs? The case of MiríadaX
    Albó, Laia; Hernández Leo, Davinia; Oliver Riera, Miquel (2016)
    Most MOOCs offer open learning opportunities at Higher Education (HE) level./nHowever, it is still unclear how HE students are taking this type of course. This/nstudy focuses on the profile of HE students participating in ...
  • Blended MOOCs: university teachers’ perspective
    Albó, Laia; Hernández Leo, Davinia; Oliver Riera, Miquel (CEUR Workshop Proceedings, 2015)
    Blended Massive Open Online Courses (bMOOCs) have arisen as a blended learning strategy that combines the use of MOOC platform-supported activities and video-based content with in-class face-to-face activities in Higher ...
  • Blockchain enablers for supply chains: how to boost implementation in industry
    Della Valle, Fabio; Oliver Riera, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 2020)
    Supply chain management is considered one of the main sectors of development for blockchain technology. This study provides solid contributions to understanding blockchain innovation and presents some main features and ...
  • Blockchain technology: driving innovation in the supply chain
    Della Valle, Fabio (Universitat Pompeu Fabra, 2021-12-20)
    This thesis presents a study of blockchain impacts for supply chain (SC) application. By conducting explorative research, the thesis presents a grounded theory analysis based on eighteen interviews with international experts ...
  • Blockchain-based information management for supply chain data-platforms
    Della Valle, Fabio; Oliver Riera, Miquel (MDPI, 2021)
    Performance measurement and information management are vital assets for supply chain management. In this study, we analyzed the effective combination between blockchain technologies and supply chain management processes. ...
  • Carrier sense multiple acces with enhanced collision avoidance
    Barceló Vicens, Jaume (Universitat Pompeu Fabra, 2011-04-12)
    Aquesta tesi suggereix usar un compte enrere determinista després de les transmissions exitoses en les xarxes d'àrea local sense fils. Com que les estacions que han transmès amb èxit en el seu darrer intent no poden ...
  • Challenges for coonnecting citizens and smart cities: ICT, e-governance and blockchain
    Oliveira, Thays Aparecida de; Oliver Riera, Miquel; Ramalhinho-Lourenço, Helena (MDPI, 2020)
    The way citizens interact with cities affects overall life quality. Their participation in social decisions is of paramount importance for helping on public decisions that affect governance, regulation and education. This ...
  • Collision-free WLANs: from concepts to working protocols
    Sanabria-Russo, Luis (Universitat Pompeu Fabra, 2016-11-23)
    Using a deterministic backoff after successful transmissions as a distributed contention mechanism for access to the channel can draw benefits from scheduled operation, like the elimination of simultaneous transmissions, ...
  • Connecting real, sustainable, smart and digital cities
    Oliveira, Thays Aparecida de (Universitat Pompeu Fabra, 2021-01-15)
    This thesis addresses on research accomplished and published during the last five years on the state-of-the-art about the development on Smart and Digital Cities. The world population has been increasing and conglomerating ...
  • CoNTe: a core network temporal blockchain for 5G
    Platt, Steven; Sanabria Russo, Luis; Oliver Riera, Miquel (MDPI, 2020)
    Virtual Network Functions allow the effective separation between hardware and network functionality, a strong paradigm shift from previously tightly integrated monolithic, vendor, and technology dependent deployments. In ...
  • CUIDATS: an RFID–WSN hybrid monitoring system for smart health care environments
    Adame, Toni; Bel, Albert; Carreras, Anna; Melià Seguí, Joan; Oliver Riera, Miquel; Pous Andrés, Rafael (Elsevier, 2018)
    The continuous development and improvement of low-power wireless communication technologies is enabling the emergence of many new applications in the field of the Internet of Things (IoT). One of the main areas of research ...
  • Decentralized cellular networks: Towards blockchain enabled cellular overlays
    Platt, Steven (Universitat Pompeu Fabra, 2021-12-10)
    This thesis undertakes an investigation into the fit and utility of blockchain technologies within cellular networks. The core of this writing is a new 5G core network blockchain designed to be compatible with, and paired ...
  • A distributed ledger-enabled interworking model for the wireless air interface
    Platt, Steven; Oliver Riera, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 2019)
    While direct allocation of spectrum and evolved medium access protocols provide a base for ubiquitous wireless connectivity, the existing TCP/IP and OSI models were designed for wired networks and do not address open ...

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