Ara es mostren els items 1-17 de 17

    • Cooperative communications: from theory to experimental implementation 

      Alonso-Zárate, Jesús; Sanchez Recacha, Javier; Zorba, Nizar; Pérez Neira, Ana Isabel; Verikoukis, Christos (2012)
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      Over the last years, cooperative communications have been studied from both fundamental and practical points of view. However, most of the existing studies of cooperative communications rely on math or computer simulation. ...
    • Demonstrating low-power distributed queuing for active RFID communications at 433 MHz 

      Tuset-Peiro, Pere; Alonso Zárate, Luis Gonzaga; Vázquez-Gallego, Francisco; Alonso-Zárate, Jesús; Vilajosana, Xavier (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      This paper presents a demonstrator of Low-Power Distributed Queuing (LPDQ), a MAC protocol targeted at active RFID systems operating at 433 MHz. LPDQ is based on a packet-based Preamble Sampling for network synchronization ...
    • Energy analysis of a contention tree-based access protocol for machine-to-machine networks with idle-to-saturation traffic transitions 

      Vázquez-Gallego, Francisco; Alonso-Zárate, Jesús; Tuset-Peiro, Pere; Alonso Zárate, Luis Gonzaga (2014)
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      Machine-to-Machine (M2M) area networks must provide connectivity between an M2M gateway and a large number of energy-constrained M2M devices. Attaining high energy efficiency is essential in order to prolong devices lifetime. ...
    • Energy analysis of contention tree-based access protocols in dense machine-to-machine area networks 

      Vázquez-Gallego, Francisco; Alonso Zárate, Luis Gonzaga; Alonso-Zárate, Jesús (2015-04-23)
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      Accés obert
      Machine-to-Machine (M2M) area networks aim at connecting an M2M gateway with a large number of energy-constrained devices that must operate autonomously for years. Therefore, attaining high energy efficiency is essential ...
    • Energy consumption optimisation for duty-cycled schemes in shadowed environments 

      Predojev, Tatjana; Alonso-Zárate, Jesús; Dohler, Mischa; Alonso Zárate, Luis Gonzaga (2014-05-28)
      Article
      Accés obert
      The focus of this study is the optimal configuration of a wireless low-power duty-cycled network with respect to the minimal energy consumption. Precisely, the energy consumption of a truncated-ARQ scheme in realistic ...
    • Energy harvesting-aware distributed queuing access for wireless machine-to-machine networks 

      Vázquez Gallego, Francisco; Alonso Zárate, Luis Gonzaga; Alonso-Zárate, Jesús (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      The Energy Harvesting-aware Distributed Queuing access protocol (EH-DQ) is presented in this paper as a novel Medium Access Control protocol for wireless Machineto-Machine networks with energy harvesting capabilities. ...
    • Energy performance of distributed queuing access in machine-to-machine networks with idle-to-saturation transitions 

      Vázquez-Gallego, Francisco; Alonso-Zárate, Jesús; Tuset-Peiro, Pere; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      Machine-to-Machine (M2M) networks must be energy-ef¿cient to operate autonomously for years, or even decades. In this paper, we consider a synchronized duty-cycled M2M network composed of a huge number of dormant ...
    • Experimental energy consumption of Frame Slotted ALOHA and Distributed Queuing for data collection scenarios 

      Tuset-Peiro, Pere; Vázquez-Gallego, Francisco; Alonso-Zárate, Jesús; Alonso Zárate, Luis Gonzaga; Vilajosana, Xavier (2014-07)
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      Accés obert
      Data collection is a key scenario for the Internet of Things because it enables gathering sensor data from distributed nodes that use low-power and long-range wireless technologies to communicate in a single-hop approach. ...
    • Is the random access channel of LTE and LTE-A suitable for M2M communications? A survey of alternatives 

      Laya Romero, Andrés Ernesto; Alonso Zárate, Luis Gonzaga; Alonso-Zárate, Jesús (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      The 3GPP has raised the need to revisit the design of next generations of cellular networks in order to make them capable and efficient to provide M2M services. One of the key challenges that has been identified is the ...
    • LPDQ: a self-scheduled TDMA MAC protocol for one-hop dynamic lowpower wireless networks 

      Tuset-Peiro, Pere; Vázquez-Gallego, Francisco; Alonso-Zárate, Jesús; Alonso Zárate, Luis Gonzaga; Vilajosana, Xavier (Elsevier, 2015-07)
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      Accés obert
      Current Medium Access Control (MAC) protocols for data collection scenarios with a large number of nodes that generate bursty traffic are based on Low-Power Listening (LPL) for network synchronization and Frame Slotted ...
    • Massive access in the random access channel of LTE for M2M communications: an energy perspective 

      Laya, Andrés; Alonso-Zárate, Jesús; Alonso Zárate, Luis Gonzaga; Chatzimisios, Periklis (2015)
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      The capacity limits of the Random Access Channel (RACH) of Long Term Evolution (LTE) for highly dense Machineto-Machine communications are studied in this paper. We consider the case study when a high number of devices ...
    • Modeling and analysis of reservation frame slotted-ALOHA in wireless machine-to-machine area networks for data collection 

      Vázquez-Gallego, Francisco; Alonso Zárate, Luis Gonzaga; Alonso-Zárate, Jesús (2015-02-09)
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      Accés obert
      Reservation frame slotted-ALOHA (RFSA) was proposed in the past to manage the access to the wireless channel when devices generate long messages fragmented into small packets. In this paper, we consider an M2M area network ...
    • Performance evaluation of frame slotted-ALOHA with succesive interference cancellation in machine-to-machine networks 

      Vázquez-Gallego, Francisco; Rietti, Marc; Bas, Joan; Alonso-Zárate, Jesús; Alonso Zárate, Luis Gonzaga (VDE Conference Publications, 2014)
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      Machine-to-Machine (M2M) area networks connect a gateway with a huge number of energy-constrained end-devices. Therefore, energy efficiency is essential to prolong the lifetime of M2M networks. In this paper, we consider ...
    • Persistent RCSMA: a MAC protocol for a distributed cooperative ARQ scheme in wireless networks 

      Alonso-Zárate, Jesús; Kartsakli, Elli; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (HINDAWI, 2008-04-09)
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      Accés obert
      The persistent relay carrier sensing multiple access (PRCSMA) protocol is presented in this paper as a novel medium access control (MAC) protocol that allows for the execution of a distributed cooperative automatic ...
    • Reliable machine-to-machine multicast services with multi-radio cooperative retransmissions 

      Laya, Andrés; Alonso Zárate, Luis Gonzaga; Alonso-Zárate, Jesús; Chatzimisios, Periklis (2015-02)
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      Accés obert
      The 3GPP is working towards the definition of service requirements and technical solutions to provide support for energy-efficient Machine Type Communications (MTC) in the forthcoming generations of cellular networks. One ...
    • Reservation dynamic frame slotted-ALOHA for wireless M2M networks with energy harvesting 

      Vázquez-Gallego, Francisco; Alonso-Zárate, Jesús; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      We consider a wireless Machine-to-Machine (M2M) area network where a gateway periodically collects data from a group of end-devices equipped with energy harvesters. While the use of energy harvesters ideally provides ...
    • Standardized low-power wireless communication technologies for distributed sensing applications 

      Vilajosana, Xavier; Tuset-Peiro, Pere; Vázquez Gallego, Francisco; Alonso-Zárate, Jesús; Alonso Zárate, Luis Gonzaga (2014-02-10)
      Article
      Accés obert
      Recent standardization efforts on low-power wireless communication technologies, including time-slotted channel hopping (TSCH) and DASH7 Alliance Mode (D7AM), are starting to change industrial sensing applications, enabling ...