Now showing items 1-20 of 46

  • A belief-based decision-making framework for spectrum selection in cognitive radio networks 

    Pérez Romero, Jordi; Raschellà, Alessandro; Sallent Roig, José Oriol; Umbert Juliana, Anna (2015-12-17)
    Article
    Open Access
    This paper presents a comprehensive cognitive management framework for spectrum selection in cognitive radio networks. The framework uses a belief vector concept as a means to predict the interference affecting the different ...
  • A generic radio channel emulator to evaluate higher layer protocols in a CDMA system 

    Umbert Juliana, Anna; Díaz Romero, M. del Pilar (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Conference report
    Open Access
    Currently, we are involved in the standardisation process to specify the next mobile system generation. A wideband code division multiple access (WCDMA) system is considered in most of the region versions. It would be very ...
  • An analytical model for multi-tenant radio access networks supporting guaranteed bit rate services 

    Vilà Muñoz, Irene; Sallent Roig, José Oriol; Umbert Juliana, Anna; Pérez Romero, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2019-01-01)
    Article
    Open Access
    Network slicing is a key feature of forthcoming fifth generation (5G) systems to facilitate the partitioning of the network into multiple logical networks customized according to different business and application needs. ...
  • A new RAN slicing strategy for multi-tenancy support in a WLAN scenario 

    Koutlia, Aikaterini; Umbert Juliana, Anna; Riggio, R.; Vilà Muñoz, Irene; Casadevall Palacio, Fernando José (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    Conference report
    Restricted access - publisher's policy
    Radio Access Network (RAN) slicing is a key technology, based on Software Defined Networks (SDN) and Network Function Virtualization (NFV), which aims at providing a more efficient utilization of the available network ...
  • An experimental assessment of channel selection in cognitive radio networks 

    Umbert Juliana, Anna; Sallent Roig, José Oriol; Pérez Romero, Jordi; Sánchez González, Juan; Collins, Diarmuid; Kist, Maicon (Springer, 2018)
    Conference report
    Open Access
    The management of future networks is expected to fully exploit cognitive capabilities that embrace knowledge and intelligence, increasing the degree of automation, making the network more self-autonomous and enabling a ...
  • An outdoor TV band radio environment map for a manhattan like layout 

    Umbert Juliana, Anna; Casadevall Palacio, Fernando José; Rodríguez, Estuardo G. (2016)
    Conference report
    Restricted access - publisher's policy
    This paper presents an outdoor Radio Environment Map (REM) for the television band applied to the UPCCampus Nord, which has a Manhattan like structure. A measurement campaign of the received TV signal in the streets and ...
  • Application of radio environment maps for dynamic broadband access in TV bands in urban areas 

    Kliks, Adrian; Kryszkiewicz, Pawel; Umbert Juliana, Anna; Pérez Romero, Jordi; Casadevall Palacio, Fernando José; Kulacz, Lukasz (Institute of Electrical and Electronics Engineers (IEEE), 2017-09-09)
    Article
    Open Access
    Spectrum sharing based on the dedicated databases, particularly in the context of TV band, is widely considered as a promising tool for better spectrum utilization in the future wireless networks. Practical realization of ...
  • A radio channel emulator for WCDMA, based on the hidden Markov model (HMM) 

    Umbert Juliana, Anna; Díaz Romero, M. del Pilar (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Conference report
    Open Access
    One of the main development and research subjects within the telecommunications area activity is the 3G mobile systems standardisation. The radio access is, of course, the main trouble in mobile systems, so it is important ...
  • A real time emulator of the UMTS lower layers for the wineglass demonstrator 

    Gelonch Bosch, Antonio José; Revés Ballesté, Xavier; Umbert Juliana, Anna; Ferrús Ferré, Ramón Antonio; Casadevall Palacio, Fernando José (European Commission, 2000)
    Conference report
    Open Access
    In this paper, a general description of the main features of a Real Time Emulator, which emulates the lower layers of the UMTS Radio Access system, is presented. For the physical layer, the emulation model is based on the ...
  • A testbed platform to demonstrate spectrum selection in opportunistic networks 

    Raschellà, Alessandro; Umbert Juliana, Anna; Pérez Romero, Jordi; Sallent Roig, José Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference report
    Restricted access - publisher's policy
    This paper presents a testbed platform to demonstrate and validate spectrum opportunity identification and spectrum selection functionalities in Opportunistic Networks (ONs). The hardware component of the testbed is based ...
  • Contribución al diseño de la arquitectura de red para la integración de servicios de paquetes de datos en el sistema UMTS 

    Umbert Juliana, Anna (Universitat Politècnica de Catalunya, 2004-10-06)
    Doctoral thesis
    Open Access
    Els sistemes de comunicacions mòbils de segona generació (2G) estan dirigits a donar servei de veu amb una qualitat acceptable. L'evolució de les necessitats dels usuaris cap a aplicacions multimedia fa necessari incorporar ...
  • Cross-layer schedulling strategy for UMTS downlink enhancement 

    Ferrús Ferré, Ramón Antonio; Alonso Zárate, Luis Gonzaga; Umbert Juliana, Anna; Revés Ballesté, Xavier; Pérez Romero, Jordi; Casadevall Palacio, Fernando José (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-06)
    Article
    Open Access
    This article describes the benefits of including cross-layer information in the scheduling mechanism of a UMTS downlink channel. In particular, the information obtained from the fast power control algorithm is used to ...
  • D21.1 - Description of EuWIn@CTTC technical facilities and interfaces, and preliminary plan of activities 

    Payaró, Miquel; Bertzoudis, Nikolaos; Fernández, Carlos; Closas, Pau; Arribas, Javier; Verdone, Roberto; Gezici, Sinan; Umbert Juliana, Anna; Oestges, Claude; Kryszkiewicz, Pawel; Kaltenberger, Florian; Dardari, Davide (2013-04)
    External research report
    Open Access
    The nature of this deliverable of WP2.1 (“Radio interfaces for next-generation wireless systems”) is mainly descriptive; it introduces the EuWIn lab at large, providing detailed descriptions about its three sites (CTTC, ...
  • D21.3 Analysis of initial results at EuWIN@CTTC 

    Fernandez-Prades, Carles; Masera, Guido; Dardari, Davide; Calanchi, Giacomo; Umbert Juliana, Anna; Pérez Romero, Jordi; Kliks, Adrian; Kryszkiewicz, Pawel; Casadevall Palacio, Fernando José; Closas, Pau; Moragrega, Ana; Arribas, Javier; Bartzoudis, Nikolaos; Font-Bach, Oriol; Payaró, Miquel; Vinogradov, Evgenii; Oestges, Claude; Joseph, Wout; Hanssens, Brecht; Degli-Esposti, Vittorio; Vitucci, Enrico; Fleury, Bernard; Zemen, Thomas; Gan, Mingming; Nafka, Amor (2014-11)
    External research report
    Open Access
    The nature of this Deliverable of WP2.1 (“Radio interfaces for next-generation wireless systems”) is mainly descriptive and its purpose is to provide a report on the status of the different Joint Research Activities (JRAs) ...
  • D22.1 Definition of EuWIn@CNIT/Bologna testbed interfaces and preliminary plan of activities 

    Dardari, Davide; Verdone, Roberto; Abrignani, Melchiorre Danilo; Buratti, Chiara; Stajkic, Andrea; Martelli, Flavia; Kaltenberger, Florian; Payaró, Miquel; Gezici, Sinan; Umbert Juliana, Anna (2013-04)
    External research report
    Open Access
  • Deffinition and evaluation of JRRM and ASM algorithms 

    López Benítez, Miguel; Umbert Juliana, Anna; Casadevall Palacio, Fernando José; Pérez Romero, Jordi (2010-01)
    External research report
    Open Access
    This deliverable (DR9.2) describes the radio resource management, joint radio resource management and advanced spectrum management strategies developed in each of the tasks of WPR.9 during the second year of study. The ...
  • Deployment of indoor LTE small cells in TV white spaces 

    Abdelkader, Abdelrahman; Pérez Romero, Jordi; Umbert Juliana, Anna; Casadevall Palacio, Fernando José; Kliks, Adrian; Kryszkiewicz, Pawel (2015)
    Conference report
    Restricted access - publisher's policy
    This work focuses on the deployment of LTE small cells acting as secondary transmitters in TVWS for indoor scenarios making use of measurements stored in a Radio Environment Map (REM) that characterizes the DVB-T reception. ...
  • DR9.3 Final report of the JRRM and ASM activities 

    Debbah, Merouane; Kliks, Adrian; Moy, Christophe; Palicot, Jacques; Jouini, Wassim; Casadevall Palacio, Fernando José; Umbert Juliana, Anna; López Benítez, Miguel; Pérez Romero, Jordi; Serrador, António; Caeiro, Luisa; Correia, Luis; Moretti, Marco; Bezerra Rodrigues, Emanuel; Sroka, Pawel; Bogucka, Hanna (2010-12)
    External research report
    Open Access
    This deliverable provides the final report with the summary of the activities carried out in NEWCOM++ WPR9, with a particular focus on those obtained during the last year. They address on the one hand RRM and JRRM strategies ...
  • DVB-T channels measurements for the deployment of outdoor REM databases 

    Kryszkiewicz, Pawel; Kliks, Adrian; Cichon, Krzysztof; Umbert Juliana, Anna; Pérez Romero, Jordi; Casadevall Palacio, Fernando José (2015)
    Conference report
    Restricted access - publisher's policy
    The goal of this work is to discuss the stability and other important features of the observed spectrum occupancy in the context of outdoor Radio Environment Maps database deployment. Reliable deployment ...
  • DVB-T channels measurements for the deployment of outdoor REM databases 

    Kliks, Adrian; Kryszkiewicz, Pawel; Cichon, Krzysztof; Umbert Juliana, Anna; Pérez Romero, Jordi; Casadevall Palacio, Fernando José (2014)
    Article
    Restricted access - publisher's policy
    In this paper the analysis of the spectrum occupancy in the TV band is provided based on the outdoor measurements campaigns carried out in Poznan, Poland in 2013 and 2014. The goal of this work is to discuss the stability ...