Now showing items 1-20 of 72

    • 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)
      Conference report
      Open Access
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Article
      Open Access
      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)
      Article
      Open Access
      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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Active queue management as quality of service enabler for 5G networks 

      Irazabal Bengoa, Mikel; López Aguilera, M. Elena; Seyfettin Demirkol, Ilker (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Open Access
      5G is envisioned as the key technology for guaranteeing low-latency wireless services. Packets will be marked with QoS Flow Indicators (QFI) for different forwarding treatment. 3GPP defines the end-to-end delay limits, but ...
    • Adaptive sensing and optimal power allocation for wireless video sensors with sigma-delta imager 

      Malijan, Marisa; Seyfettin Demirkol, Ilker; Maricic, Daniel (2010-10)
      Article
      Open Access
      We consider optimal power allocation for wireless video sensors (WVSs), including the image sensor subsystem in the system analysis. By assigning a power-rate-distortion (P-R-D) characteristic for the image sensor, we build ...
    • ADV-MAC: analysis and optimization of energy efficiency through data advertisements for wireless sensor networks 

      Ray, Sourya; Seyfettin Demirkol, Ilker; Heinzelman, Wendi (Elsevier, 2011-07)
      Article
      Restricted access - publisher's policy
      Several Medium Access Control (MAC) protocols have been proposed for wireless sensor networks with the objective of minimizing energy consumption. For example, Sensor-MAC (S-MAC) was proposed to reduce energy consumption ...
    • 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; Seyfettin Demirkol, Ilker; Paradells Aspas, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2019-04-09)
      Article
      Open Access
      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. ...
    • Are mobility management solutions ready for 5G and beyond? 

      Jain, Akshay; López Aguilera, M. Elena; Seyfettin Demirkol, Ilker (Elsevier, 2020-09-01)
      Article
      Restricted access - publisher's policy
      Enabling users to move to different geographical locations within a network and still be able to maintain their connectivity and most essentially, continuity of service, is what makes any wireless network ubiquitous. Whilst ...
    • 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)
      Article
      Open Access
      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 ...
    • Broadband Networks and Services 

      Hesselbach Serra, Xavier; Seyfettin Demirkol, Ilker (Universitat Politècnica de Catalunya, 2013-01-14)
      Exam
      Restricted access to the UPC academic community
    • Channel model of molecular communication via diffusion in a vessel-like environment Considering a Partially Covering Receiver 

      Turan, Meriç; Kuran, Mehmet Sükrü; Yilmaz, Hüseyin Birkan; Seyfettin Demirkol, Ilker; Tugcu, Tuna (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Restricted access - publisher's policy
      By considering potential health problems that a fully covering receiver may cause in vessel-like environments, the implementation of a partially covering receiver is needed. To this end, distribution of hitting location ...
    • CoAP congestion control for the Internet of Things 

      Betzler, August; Gómez Montenegro, Carlos; Seyfettin Demirkol, Ilker; Paradells Aspas, Josep (2016-07)
      Article
      Open Access
      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)
      Article
      Open Access
      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)
      Conference lecture
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Density-aware mobile networks: opportunities and challenges 

      Mollahasani, Shahram; Eroglu, Alperen; Seyfettin Demirkol, Ilker; Onur, Ertan (2020-04)
      Article
      Restricted access - publisher's policy
      We experience a major paradigm shift in mobile networks. The infrastructure of cellular networks is becoming mobile since it is being densified also by using mobile and nomadic small cells to increase coverage and capacity. ...
    • 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)
      Article
      Restricted access - publisher's policy
      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 ...