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  • 5G Infrastructures supporting end-user and operational services: the 5G-XHaul architectural perspective 

    Tzanakaki, Anna; Simeonidou, Dimitra; Berberana, Ignacio; Syrivelis, Dimitris; Camps Mur, Daniel; Seyfettin Demirkol, Ilker; Gutiérrez, Jesús; Wei, Qing; Fehske, Albrecht; Eiselt, Michael; Bartelt, Jens; Lyberopoulos, George; Grass, Eckhard; Anastasopoulos, Markos; Korakis, Thanasis; Flegkas, Paris; Pateromichelakis, Emmanouil; Grieger, Michael; Theodoropoulou, Eleni (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    We propose an optical-wireless 5G infrastructure offering converged fronthauling/backhauling functions to support both operational and end-user cloud services. A layered architectural structure required to efficiently ...

  • 5G transport network blueprint and dimensioning for a dense urban scenario 

    Seyfettin Demirkol, Ilker; Camps Mur, Daniel; Bartelt, Jens; Zou, Jim (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    In this paper, we provide a quantitative evaluation of the deployment aspects and dimensioning of the 5G transport architecture in a representative European city. In particular, we select an example dense urban city scenario ...

  • 5G transport network requirements for the next generation fronthaul interface 

    Bartelt, Jens; Vucic, Nikola; Camps Mur, Daniel; García Villegas, Eduard; Seyfettin Demirkol, Ilker; Fehske, Albrecht; Grieger, Michael; Tzanakaki, Anna; Gutiérrez Terán, Jesús; Grass, Eckhard; Lyberopoulos, George; Fettweis, Gerhard (2017-05-15)
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    To meet the requirements of 5G mobile networks, several radio access technologies, such as millimeter wave communications and massive MIMO, are being proposed. In addition, cloud radio access network (C-RAN) architectures ...

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

    Betzler, August; Gómez Montenegro, Carlos; Seyfettin Demirkol, Ilker; 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; Seyfettin Demirkol, Ilker; 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 ...

  • BaNa: a noise resilient fundamental frequency detection algorithm for speech and music 

    Yang, Na; Ba, He; Cai, Weiyang; Seyfettin Demirkol, Ilker; Heinzelman, Wendi (2014-08-27)
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    Fundamental frequency (F0) is one of the essential features in many acoustic related applications. Although numerous F0 detection algorithms have been developed, the detection accuracy in noisy environments still needs ...

  • CoAP congestion control for the Internet of Things 

    Betzler, August; Gómez Montenegro, Carlos; Seyfettin Demirkol, Ilker; 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; Seyfettin Demirkol, Ilker; 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 ...

  • Competition: interference-aware multi-channel cross layer protocol for energy-efficient and low-delay networking 

    Sierra Aiello, Guillermo; Seyfettin Demirkol, Ilker; Calveras Augé, Anna M.; Gómez Montenegro, Carlos; García Villegas, Eduard; Betzler, August (Association for Computing Machinery (ACM), 2016)
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    This document aims to present the general ideas and methodology that are planned to be used for the EWSN 2016 Dependability Competition by the Wireless Networks Group of Universitat Politecnica de Catalunya. We designed, ...

  • Congestion control in reliable CoAP communication 

    Betzler, August; Gómez Montenegro, Carlos; Seyfettin Demirkol, Ilker; 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 ...

  • Cross-layer energy optimization under image quality constraints for wireless image transmissions 

    Yang, N.; Seyfettin Demirkol, Ilker; Heinzelman, W. (2012)
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    Wireless image transmission is critical in many applications, such as surveillance and environment monitoring. In order to make the best use of the limited energy of the battery-operated cameras, while satisfying the ...

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

    Oller Bosch, Joaquim; Seyfettin Demirkol, Ilker; 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 ...

  • Energy efficient wireless networking of sensor nodes 

    Seyfettin Demirkol, Ilker; Paradells Aspas, Josep; Oller Bosch, Joaquim; Casademont Serra, Jordi; Calveras Augé, Anna M.; Catalán Cid, María Luisa (2013)
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    Wireless sensor networks have paved the way to a new era in user applications, where information can be sensed, processed, and distributed from remote environments with minimal or no human interaction. As the sensor nodes ...

  • Enhanced multiclass SVM with thresholding fusion for speech-based emotion classification 

    Yang, Na; Yuan, Jianbo; Zhou, Yun; Seyfettin Demirkol, Ilker; Duan, Zhiyao; Heinzelman, Wendi; Sturge Apple, Melissa L. (2017-03-01)
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    As an essential approach to understanding human interactions, emotion classification is a vital component of behavioral studies as well as being important in the design of context-aware systems. Recent studies have shown ...

  • Evaluation of advanced congestion control mechanisms for unreliable CoAP communications 

    Betzler, August; Gómez Montenegro, Carlos; Seyfettin Demirkol, Ilker (2015)
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    Networks of constrained devices play an important role in the Internet of Things (IoT). In such networks congestion may lead to significant performance decrease and is a recurring phenomenon given the restricted hardware ...

  • Evolutionary 4G/5G network architecture assisted efficient handover signaling 

    Jain, Akshay; López Aguilera, M. Elena; Seyfettin Demirkol, Ilker (Institute of Electrical and Electronics Engineers (IEEE), 2018-12-06)
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    Future wireless networks are expected to be ultra-dense and heterogeneous not just in terms of the number and type of base stations but also in terms of the number of users and the application types they access. Such a ...

  • Experimental evaluation of congestion control for CoAP communications without end-to-end reliability 

    Betzler, August; Isern, Javier; Gómez Montenegro, Carlos; Seyfettin Demirkol, Ilker; Paradells Aspas, Josep (Elsevier, 2016-12-01)
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    Accés restringit per política de l'editorial
    The Constrained Application Protocol (CoAP) has been designed by the Internet Engineering Task Force (IETF) for Internet of Things (IoT) communications. CoAP is a lightweight, request/response-based RESTful protocol that ...

  • Has time come to switch from duty-cycled MAC protocols to wake-up radio for wireless sensor networks? 

    Oller, Joaquim; Seyfettin Demirkol, Ilker; Casademont Serra, Jordi; Paradells Aspas, Josep; Gamm, Gerd Ulrich; Reindl, Leonhard Michael (2016-04-01)
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    Duty-cycled Medium Access Control (MAC) protocols certainly improve the energy efficiency of wireless networks. However, most of these protocols still suffer from severe degrees of overhearing and idle listening. These two ...

  • How does noise impact speech-based emotion classification? 

    Yang, Na; Yuan, Jianbo; Zhou, Yun; Seyfettin Demirkol, Ilker; Heinzelman, Wendi; Sturge Apple, Melissa L. (2014)
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    Emotion classification, Support vector machine, Thresholding fusion, Noisy speech

  • IEEE 802.11-enabled wake-up radio system: design and performance evaluation 

    Oller Bosch, Joaquim; García Villegas, Eduard; López Aguilera, M. Elena; Seyfettin Demirkol, Ilker; Casademont Serra, Jordi; Paradells Aspas, Josep; Gamm, Gerd Ulrich; Reindl, Leonhard Michael (Institution of Electrical Engineers, 2014-09-25)
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    Today, the vast majority of personal communication devices, such as laptops, smartphones, and logically wireless fidelity (Wi-Fi) access points feature IEEE 802.11 chipsets. In turn, wake-up radio (WuR) systems are used ...