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    • A bluetooth low energy indoor positioning system with channel diversity, weighted trilateration and Kalman filtering 

      Cantón Paterna, Vicente; Calveras Augé, Anna M.; Paradells Aspas, Josep; Perez Bullones, Maria Antonia (Multidisciplinary Digital Publishing Institute (MDPI), 2017-12-01)
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      Indoor Positioning Systems (IPS) using Bluetooth Low Energy (BLE) technology are currently becoming real and available, which has made them grow in popularity and use. However, there are still plenty of challenges related ...

    • A high-accuracy, scalable and affordable indoor positioning system using visible light positioning for automated guided vehicles 

      Boixader Coma, Aleix; Labella, Carlos; Catalán, Marisa; Paradells Aspas, Josep (2024-01-01)
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      Indoor Positioning Systems (IPSs) have multiple applications. For example, they can be used to guide people, to locate items in a warehouse and to support the navigation of Automated Guided Vehicles (AGV). Currently most ...

    • A holistic approach to ZigBee performance enhancement for home automation networks 

      Betzler, August; Gómez Montenegro, Carlos; Demirkol, Ilker Seyfettin; Paradells Aspas, Josep (2014-08-01)
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      Wireless home automation networks are gaining importance for smart homes. In this ambit, ZigBee networks play an important role. The ZigBee specification defines a default set of protocol stack parameters and mechanisms ...

    • A novel wake-up communication system using solar panel and visible light communication 

      Carrascal, Carolina; Demirkol, Ilker Seyfettin; Paradells Aspas, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      One of the most promising energy-efficient communication methods is the use of wake-up receivers. In this paper, we propose and develop a novel wake-up communication system that uses Visible Light Communication (VLC) and ...

    • A Sigfox energy consumption model 

      Gómez Montenegro, Carlos; Veras Revelles, Juan Carlos; Vidal Ferré, Rafael; Casals Ibáñez, Lluís; Paradells Aspas, Josep (Multidisciplinary Digital Publishing Institute (MDPI), 2019-02-07)
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      Sigfox has become one of the main Low-Power Wide Area Network (LPWAN) technologies, as it has attracted the attention of the industry, academy and standards development organizations in recent years. Sigfox devices, such ...

    • Achievable bandwidth estimation for stations in multi-rate IEEE 802.11 WLAN cells 

      García Villegas, Eduard; Viamonte Solé, David; Vidal Ferré, Rafael; Paradells Aspas, Josep (2007-04-16)
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      This paper analyzes the effect of multi-rate transmissions in a CSMA wireless LAN environment. Observations in a real testbed showed that bandwidth resources (in Bytes/s) are shared fairly among all stations even though ...

    • An alternative to IEEE 802.11ba: wake-up radio with legacy IEEE 802.11 transmitters 

      Cervià Caballé, Martí; Calveras Augé, Anna M.; López Aguilera, M. Elena; García Villegas, Eduard; Demirkol, Ilker Seyfettin; Paradells Aspas, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2019-04-09)
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      Current standardization process for Wake-up Radio (WuR) within the IEEE 802.11 Working Group, known as the IEEE 802.11ba, has brought interest to the IEEE 802.11-related technologies for the implementation of WuR systems. ...

    • Bluetooth: circuits, sistemes i aplicacions en l'entorn de les TIC 

      Aragonès Cervera, Xavier; González, José Luis; Pérez Neira, Ana Isabel; Casadevall Palacio, Fernando José; Paradells Aspas, Josep (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2005-02)
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      En el projecte s'han implementat uns mòduls formatius, que inclouen tant una vessant teòrica com una part experimental, que permetin a un estudiant de segon cicle de la ETSETB conèixer i desenvolupar aplicacions sobre un ...

    • CoAP congestion control for the Internet of Things 

      Betzler, August; Gómez Montenegro, Carlos; Demirkol, Ilker Seyfettin; Paradells Aspas, Josep (2016-07)
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      CoAP is a lightweight RESTful application layer protocol devised for the IoT. Operating on top of UDP, CoAP must handle congestion control by itself. The core CoAP specification defines a basic congestion control mechanism, ...

    • CoCoA+: an advanced congestion control mechanism for CoAP 

      Betzler, August; Gómez Montenegro, Carlos; Demirkol, Ilker Seyfettin; Paradells Aspas, Josep (Elsevier, 2015-10-01)
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      The Constrained Application Protocol (CoAP) has been designed by the Internet Engineering Task Force (IETF) for Internet of Things (IoT) devices. Due to the limited radio channel capacities and hardware resources of such ...

    • Congestion control in reliable CoAP communication 

      Betzler, August; Gómez Montenegro, Carlos; Demirkol, Ilker Seyfettin; Paradells Aspas, Josep (Association for Computing Machinery (ACM), 2013)
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      The development of IPv6 stacks for wireless constrained devices that have limited hardware resources has paved the way for many new areas of applications and protocols. The Constrained Application Protocol (CoAP) has been ...

    • Contention- and interference-aware flow-based routing in wireless mesh networks: design and evaluation of a novel routing metric 

      Catalán Cid, Miguel; Ferrer, Josep Lluís; Gómez Montenegro, Carlos; Paradells Aspas, Josep (2010)
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      As the popularity of IEEE 802.11-based Wireless Mesh Networks (WMNs) grows, end users of these environments demand better performance and quality of service (QoS). However, the Medium Access Control (MAC) layer of the ...

    • Cooperative Load Balancing in IEEE 802.11 Networks with Cell Breathing 

      García Villegas, Eduard; Vidal Ferré, Rafael; Paradells Aspas, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2008-07-06)
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      IEEE 802.11 WLANs (Wi-Fi) are widely deployed for providing Internet access in public spaces, known as Hot Spots. In these scenarios, users tend to be "gregarious” and essentially static. Since association and roaming ...

    • Demonstration and evaluation of precise positioning for connected and automated mobility services 

      Igual Nevot, Júlia; Catalán Cid, Marisa; Catalán Cid, Miguel; Vazquez-Gallego, Francisco; Fernández Hidalgo, Javier; Muñoz, Raul; Sedar, Roshan; Casellas, Ramon; Vilalta, Ricard; Calveras Augé, Anna M.; Paradells Aspas, Josep; Lefebvre, Mathieu; Gardes, Frederic; Odinot, Jean Marc; Moscatelli, Francesca (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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      Cooperative, Connected and Automated Mobility (CCAM) services require precise and reliable localization services able to infer and track the position of a vehicle with lane accuracy. The H2020 5GCroCo project, which trials ...

    • Deploying large-scale IEEE802.11 networks using IP paging with link-specific capabilities : a standard compliant approach and its performance analysis 

      Vidal Ferré, Rafael; García Villegas, Eduard; Paradells Aspas, Josep (2010-03-18)
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      IEEE802.11 is a layer two technology that offers limitedmobility support. It suffers from scalability problems caused by the performance of the mechanisms related to the address resolution and the discovery and maintenance ...

    • Design and implementation of a Wake-up Radio receiver for fast 250 kbps bit rate 

      López Aguilera, M. Elena; Hussein, Maison; Cervià Caballé, Martí; Paradells Aspas, Josep; Calveras Augé, Anna M. (2019-12)
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      Wake-up radio (WuR) systems have appeared as a solution for reducing power consumption. As IEEE 802.11 is the preferred radio technology, IEEE 802.11 task group TGba focuses on the IEEE 802.11-based WuR standardization. ...

    • Design of a UMTS/GPRS Assisted Mesh Network (UAMN) 

      Paradells Aspas, Josep; Ferrer, Josep Lluís; Catalán Cid, María Luisa; Torres, Wilfredo; Catalán Cid, Miguel; Sánchez Loro, Xavier; Beltrán Martínez, María Victoria; García Villegas, Eduard; Gómez C.; Plans, Pau; Rubio, Javier; Almodóvar, Daniel; Rodellar, Daniel; Subotic, N.; Wenger, D.; Steiner, I. (Wireless World Research Forum, 2006-11-15)
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      Wireless Mesh or multi-hop networks (WMNs) are well known thanks to its simplicity on deployment and the lack of infrastructure. These two advantages come with some drawbacks. WMNs have limitations with the support of ...

    • Design, development and performance evaluation of a low-cost, Low-power wake-up radio system for WSN 

      Oller Bosch, Joaquim; Demirkol, Ilker Seyfettin; Casademont Serra, Jordi; Paradells Aspas, Josep (2013-11-01)
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      Energy-efficient operation is a challenge for wireless sensor networks (WSNs). A common method employed for this purpose is duty-cycled operation, which extends battery lifetime yet incurs several types of energy wastes ...

    • Development and implantation of two teleradiology and teleconsulting applications in Catalunya: RAIM and CARE 

      Barbero Rodríguez, Octavio; Catasús, Xavier; Fernández Bayo, Josep; Paradells Aspas, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2002)
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      Two teleradiology applications with the added-value of teleconsulting are described: CARE, a high level diagnostic oriented application with videoconference and image and cursor synchronization based on SUN stations, and ...

    • Effect of adjacent-channel interference in IEEE 802.11 WLANs 

      García Villegas, Eduard; López Aguilera, M. Elena; Vidal Ferré, Rafael; Paradells Aspas, Josep (2007-06-03)
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      Frequency channels are a scarce resource in the ISM bands used by IEEE 802.11 WLANs. Current radio resource management is often limited to a small number of nonoverlapping channels, which leaves only three possible channels ...