Now showing items 1-20 of 49

    • 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 ...
    • 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 ...
    • 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 ...
    • 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. ...
    • 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 ...
    • Characterisation of radio access network slicing scenarios with 5G QoS provisioning 

      Vilà Muñoz, Irene; Pérez Romero, Jordi; Sallent Roig, José Oriol; Umbert Juliana, Anna (Institute of Electrical and Electronics Engineers (IEEE), 2020-03-13)
      Article
      Open Access
      5G systems are envisaged to support a wide range of application scenarios with variate requirements. To handle this heterogeneity, 5G architecture includes network slicing capabilities that facilitate the partitioning of ...
    • 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. ...
    • Design and experimental validation of a software-defined radio access network testbed with slicing support 

      Koutlia, Katerina; Ferrús Ferré, Ramón Antonio; Coronado Calero, Estefanía; Riggio, Roberto; Casadevall Palacio, Fernando José; Umbert Juliana, Anna; Pérez Romero, Jordi (2019-01-01)
      Article
      Open Access
      Network slicing is a fundamental feature of 5G systems to partition a single network into a number of segregated logical networks, each optimized for a particular type of service or dedicated to a particular customer or ...
    • 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 ...