Now showing items 21-40 of 176

  • 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 ...
  • A novel autonomous RAT selection algorithm for non real time services 

    Pérez Romero, Jordi; Sallent Roig, José Oriol (2009)
    Conference report
    Open Access
    This paper proposes a new solution for autonomous decision-making in the RAT selection process in multi-service multi-access network scenarios. It is based on exploiting the time dimension in the RAT selection, so that, ...
  • A novel framework for dynamic spectrum management in multiCell OFDMA networks based on reinforcement learning 

    Bernardo Álvarez, Francisco; Agustí Comes, Ramon; Pérez Romero, Jordi; Sallent Roig, José Oriol (2010)
    Conference report
    Open Access
    In this work the feasibility of Reinforcement Learning (RL) for Dynamic Spectrum Management (DSM) in the context of next generation multicell Orthogonal Frequency Division Multiple Access (OFDMA) networks is studied. ...
  • A novel spectrum selection strategy for matching multi-service secondary traffic to heterogeneous primary spectrum opportunities 

    Bouali, Faouzi; Sallent Roig, José Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (IEEE, 2011)
    Conference report
    Restricted access - publisher's policy
    In order to increase spectrum utilization efficiency, CRs (Cognitive Radios) have been introduced to reuse white spaces left unused by legacy services under the strict constraint of not interfering them. In this context, ...
  • 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 real time emulator demonstrating advanced resource management solutions 

    Gelonch Bosch, Antonio José; Revés Ballesté, Xavier; Marojevic, Vuk; Nasreddine, Jad Nayef; Pérez Romero, Jordi; Sallent Roig, José Oriol (2010-07)
    Article
    Restricted access - publisher's policy
  • A roadmap from UMTS optimization to LTE self-optimization 

    Sallent Roig, José Oriol; Pérez Romero, Jordi; Sánchez González, Juan; Agustí Comes, Ramon; Díaz Guerra, Miguel Angel; Henche, David; Paul, Daniel (2011-06)
    Article
    Restricted access - publisher's policy
    Self-Organizing Networks (SON) are currently being introduced by the 3rd Generation Partnership Project (3GPP) as part of the Long Term Evolution (LTE) system as a key driver for improving the operation of wireless networks. ...
  • A robustness analysis of learning-based coexistence mechanisms for LTE-U operation in non-stationary conditions 

    Pérez Romero, Jordi; Sallent Roig, José Oriol; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Conference report
    Restricted access - publisher's policy
    The use of Long Term Evolution (LTE) in the unlicensed 5 GHz band, referred to as LTE-U, is a promising enhancement to increase the capacity of LTE networks and meet the requirements of future systems. This paper considers ...
  • Artificial intelligence-based 5G network capacity planning and operation 

    Pérez Romero, Jordi; Sallent Roig, José Oriol; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Conference report
    Restricted access - publisher's policy
    The highly demanding requirements envisaged for future 5G networks together with the required support of new customers from vertical industries (e.g. e-health, automotive, energy) pose a big challenge for operators ...
  • A rule-based solution search methodology for self-optimization in cellular networks 

    Sánchez González, Juan; Pérez Romero, Jordi; Sallent Roig, José Oriol (2014-12-12)
    Article
    Restricted access - publisher's policy
    This letter presents a rule-based solution search (RBSS) algorithm for self-optimization in a cellular network. It improves the solution search process of classical optimization methodologies by including a set of rules ...
  • A self-organized spectrum assignment strategy in next generation OFDMA networks providing secondary spectrum access 

    Bernardo Álvarez, Francisco; Agustí Comes, Ramon; Pérez Romero, Jordi; Sallent Roig, José Oriol (2009)
    Conference report
    Open Access
    This paper proposes a Self-organized Spectrum Assignment strategy in the context of next generation multicell Orthogonal Frequency Division Multiple Access networks. The proposed strategy is able to dynamically find ...
  • A simple algorithm to distribute optimally a number of external base stations in a microcellular environment 

    Agustí Comes, Ramon; Monfort, Xavier Querol; Pérez Romero, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 1998)
    Conference report
    Open Access
    A simple algorithm is proposed for the optimal distribution of a number of base stations in a microcellular environment. Criteria are defined in order to decide the combinations of antennas that should be tested, and a ...
  • A solution framework to provide management services for wireless communications in the digital home 

    Ferrús Ferré, Ramón Antonio; Sallent Roig, José Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (2012-11)
    Article
    Restricted access - publisher's policy
    The future digital home (DH) is envisioned as a place where a plethora of diverse personal and machine-to-machine communications will coexist to support different applications in areas such as information and ...
  • A Spectrum selection framework for opportunistic networks 

    Moessner, Klaus; Pérez Romero, Jordi; Sallent Roig, José Oriol; Bouali, Faouzi; Sarvanko, Heli; Mustonen, Miia; Matinmikko, Marja; Lee, Haeyoung; Vahid, Seiamak (IIMC International Information Management Corporation Ltd, 2012)
    Conference lecture
    Open Access
    This paper presents a framework for including cognitive management functionalities in the spectrum selection process for Opportunistic Networks (ONs).The framework is based on a decision making functionality interacting ...
  • 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 ...
  • Automatic detection of sub-optimal performance in UMTS networks based on drive-test measurements 

    Sallent Roig, José Oriol; Pérez Romero, Jordi; Sánchez González, Juan; Agustí Comes, Ramon; Díaz Guerra, Miguel Angel; Henche, David; Paul, Daniel (2011)
    Conference lecture
    Restricted access - publisher's policy
    This paper presents a methodology for the automatic detection of sub-optimal performance in UMTS networks based on drive-test measurements. The proposed methodology can be seen as a first step towards the more ambitious ...
  • Autonomous functionalities for cognitive radio 

    Kalliojarvi, Kari; Acar, Guray; Patouni, Eleni; Stavroulaki, Vera; Pérez Romero, Jordi (2009)
    Conference lecture
    Open Access
    This paper provides an overview on the research activities in autonomous functionalities for cognitive radio and networks, carried out in FP7/E3-project. The identified main research areas within this topic include ...
  • Average block error probability in the reverse link of a packet ds/cdma system under rayleigh fading channel conditions 

    Pérez Romero, Jordi; Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon (2000-04)
    Article
    Open Access
    Analytic expressions have been derived for the probability density functions of the total signal-to-interference ratio when considering mixed-type interference sources in the reverse link of a DS/CDMA packet radio system ...
  • Average block error probability in the reverse link of a packet DS/CDMA system under Rayleigh fading channel conditions 

    Pérez Romero, Jordi; Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-04)
    Article
    Open Access
    Analytic expressions have been derived for the probability density functions of the total signal-to-interference ratio when considering mixed-type interference sources in the reverse link of a DS/CDMA packet radio system ...
  • Business scenarios, technical challenges and system requirements - D2.1 

    Ferrús Ferré, Ramón Antonio; Moreno, Oscar; Visiedo, David; Urdiales, Diego; Santiago, Miquel Angel; Gebert, Jens; Mouton, Christian; Lange, Christian; Merat, Vincent; Bender, Paul; Wich, Andreas; Agustí Comes, Ramon; Muck, Markus; Schmmidt, Andreas; Logothetis, Marios; Akezidou, Maria; Tzifa, Lia; Tsagkaris, Kostas; Stavroulaki, Vera; Demestichas, Panagiotis; Matinmikko, Marja; Mustonen, Miia; Sallent Roig, José Oriol; Pérez Romero, Jordi; Georgakopoulos, Andreas; Pecelj, Ilija; Boskovic, Dragan; Tosic, M.; Filo, Marcin; Piesiewicz, Radoslaw; Kritikou, Yiouli; Bantouna, Aimilia; Thomatos, Evangelos; Koutsouris, Nikos (2010-11)
    External research report
    Open Access