Ara es mostren els items 1-20 de 155

  • A 4-Dimensional Markov model for the evaluation of radio access technology selection strategies in multiservice scenarios 

    Gelabert Doran, Xavier Bernardi; Pérez Romero, Jordi; Sallent Roig, José Oriol; Agustí Comes, Ramon (IEEE Press. Institute of Electrical and Electronics Engineers, 2006)
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    In order to support the conceptual development of Common Radio Resource Management (CRRM) algorithms, this paper provides an analytical approach to the performance evaluation of Radio Access Technology (RAT) selection ...
  • A channel allocation algorithm for OSA-Enabled IEEE 802.11 WLANs 

    Novillo Parales, Francisco Vicente; Churchman, Mathew; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon (2009-09)
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    Channel allocation problem is a major challenge in wireless local area networks (WLANs), especially in dense deployments of access points (APs) where congestion of the unlicensed spectrum bands (i.e., ISM bands) could ...
  • A channel allocation algorithm for OSA-Enabled IEEE 802.11 WLANs 

    Novillo Parales, Francisco Vicente; Churchman, Mathew; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon (2009)
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    Channel allocation problem is a major challenge in wireless local area networks (WLANs), especially in dense deployments of access points (APs) where congestion of the unlicensed spectrum bands (i.e., ISM bands) could ...
  • A cognitive management framework for spectrum selection 

    Bouali, Faouzi; Sallent Roig, José Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (2013-10-04)
    Article
    Accés restringit per política de l'editorial
    To increase cognitive radio (CR) operation efficiency, there has been an interest in enhancing the awareness level of spectrum utilization. In this context, this paper builds a new cognitive management functional architecture ...
  • A combined polling and ISMA-DS/CDMA protocol to provide QoS in packet mobile communications systems 

    Pérez Romero, Jordi; Agustí Comes, Ramon; Sallent Roig, José Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2000)
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    This paper presents a new mechanism that combines the flexibility of an access protocol such as ISMA-DS/CDMA with the ability of a polling mechanism to provide a specific bound for the access delay. This protocol is proposed ...
  • A comparison of different optimisation search methodologies for self-optimisation in wireless cellular networks 

    Sánchez González, Juan; Sallent Roig, José Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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    Self-Organising Networks (SON) concept is seen as a way to reduce costs by automating functionalities such as network optimisation usually performed manually with extensive human work time. This paper provides a general ...
  • A fittingness factor-based spectrum management framework for cognitive radio networks 

    Bouali, Faouzi; Sallent Roig, José Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (2013-03)
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    Accés restringit per política de l'editorial
    In order to increase cognitive radios (CRs) operation efficiency, there has been an increasing interest in strengthening awareness level about spectrum utilisation. In this respect, this paper proposes to exploit the ...
  • A framework based on a fittingness factor to enable efficient exploitation of spectrum opportunities in cognitive radio networks 

    Bouali, Faouzi; Sallent Roig, José Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (2011)
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    In order to increase CRs (Cognitive Radios) operation efficiency, there has been an interest in increasing awareness level about spectrum utilisation. In this respect, this paper proposes a new fittingness factor concept ...
  • A mobile controlled algorithm for improving the throughput in a s-aloha ds-cdma system 

    Sallent Roig, José Oriol; Agustí Comes, Ramon (Institute of Electrical and Electronics Engineers (IEEE), 1996)
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    This paper presents a novel adaptive DS-CDMA slotted-ALOHA packet random access scheme with transmitter-based spreading codes for mobiles. It is aimed at improving the throughput and message delay delivery when traffic ...
  • A multi-cell multi-objective self-optimisation methodology based on genetic algorithms for wireless cellular networks 

    Sánchez González, Juan; Sallent Roig, José Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (2013-07)
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    Accés restringit per política de l'editorial
    Self-organising networks (SON) are seen as one of the hottest topics in telecommunication network research and development, eagerly awaited by network operators to achieve a reduction in operational expenditures. However, ...
  • A near-optimum mac protocol based on the distributed queueing random access protocol (dqrap) for a cdma mobile communication system 

    Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, José Oriol (2000-09)
    Article
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    This paper presents and analyses a new near– optimum random access protocol. The proposed access scheme is suitable for a CDMA environment and minimises the total number of spreading codes needed to achieve a certain ...
  • A near-optimum MAC protocol based on the distributed queueing random access protocol (DQRAP) for a CDMA mobile communication system 

    Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, José Oriol (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-09)
    Article
    Accés obert
    This paper presents and analyzes a new near-optimum medium access control (MAC) protocol. The proposed access scheme is suitable for a CDMA mobile communication environment, and keeps under control and upper bounded the ...
  • A near-optimum medium access protocol based on the distributed queueing random access protocol (DQRAP) for a CDMA third generation mobile communication system 

    Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, José Oriol (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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    This paper presents and analyses a new near– optimum random access protocol. The proposed access scheme is suitable for a CDMA environment and minimises the total number of spreading codes needed to achieve a certain ...
  • A new medium access protocol based on distributed queues for a CDMA environment 

    Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, José Oriol (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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    This paper presents and analyses a new stable near-optimum random access protocol. The proposed access scheme is adapted for being used in a CDMA environment. It is based on distributed queues and a collision resolution ...
  • A novel ekf-based recovery in ds scheme for ds/cdma systems tracking code delay 

    Díaz Romero, M. del Pilar; Agustí Comes, Ramon (1997-04)
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    Classical delay-lock loops (DLL) have beenwidely considered for code synchronization purposes inDS/CDMA systems, although they have not been devised foroperation when channel fading is present. This paper describes a new ...
  • 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)
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    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 MAC protocol based on distributed queues for CDMA communication systems 

    Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, José Oriol (1999)
    Text en actes de congrés
    Accés obert
    This paper presents and analyses a new near-optimum medium access control (MAC) protocol. The proposed access scheme is suitable for a CDMA mobile communication environment and minimises the total number of spreading codes ...
  • 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)
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    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, ...
  • A proposal for an adaptive S-ALOHA access system for a mobile CDMA environment 

    Sallent Roig, José Oriol; Agustí Comes, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998-08)
    Article
    Accés obert
    This paper presents a novel adaptive direct-sequence code-division multiple-access (DS-CDMA) slotted-ALOHA (S-ALOHA) packet random-access scheme with transmitter-based spreading codes for mobiles. It is aimed at improving ...
  • 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
    Accés restringit per política de l'editorial
    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. ...