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Ara es mostren els items 21-40 de 213

    • A novel MAC protocol based on distributed queues for CDMA communication systems 

      Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, Oriol (1999)
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      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, 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, Oriol; Agustí Comes, Ramon (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 proposal for an adaptive S-ALOHA access system for a mobile CDMA environment 

      Sallent Roig, 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 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, Oriol (2010-07)
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    • A roadmap from UMTS optimization to LTE self-optimization 

      Sallent Roig, 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. ...

    • A robustness analysis of learning-based coexistence mechanisms for LTE-U operation in non-stationary conditions 

      Pérez Romero, Jordi; Sallent Roig, Oriol; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      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 ...

    • A rule-based solution search methodology for self-optimization in cellular networks 

      Sánchez González, Juan; Pérez Romero, Jordi; Sallent Roig, Oriol (2014-12-12)
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      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, Oriol (2009)
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      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 solution framework to provide management services for wireless communications in the digital home 

      Ferrús Ferré, Ramón Antonio; Sallent Roig, Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (2012-11)
      Article
      Accés restringit per política de l'editorial
      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, Oriol; Bouali, Faouzi; Sarvanko, Heli; Mustonen, Miia; Matinmikko, Marja; Lee, Haeyoung; Vahid, Seiamak (IIMC International Information Management Corporation Ltd, 2012)
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      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, Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      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 ...

    • A traffic distribution scheme for 5G resilient backhauling using integrated satellite networks 

      Mendoza, Fabián; Ferrús Ferré, Ramón Antonio; Sallent Roig, Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      Resilience and high availability are being considered as essential requirements in 5G networks. To fullfil these requirements, the integration of a satellite component within mobile backhaul networks is regarded as a ...

    • A tutorial on the characterisation and modelling of low layer functional splits for flexible radio access networks in 5G and beyond 

      Pérez Romero, Jordi; Sallent Roig, Oriol; Gelonch Bosch, Antonio José; Gelabert Doran, Xavier; Klaiqi, Bleron; Kahn, Marcus; Campoy García, David (Institute of Electrical and Electronics Engineers (IEEE), 2023-10)
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      Accés obert
      The centralization of baseband (BB) functions in a radio access network (RAN) towards data processing centres is receiving increasing interest as it enables the exploitation of resource pooling and statistical multiplexing ...

    • Adaptive algorithms for improving the throughput in an indoor mobile s-aloha ds-cdma system 

      Sallent Roig, Oriol; Agustí Comes, Ramon (DR. F-N PAVLIDOU IEEE, 1996)
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      This paper presents a novel Adaptive DSCDMA 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 ...

    • Adaptive S-ALOHA CDMA as an alternative way of integrating services in mobile environments 

      Sallent Roig, Oriol; Agustí Comes, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-05)
      Article
      Accés obert
      Code-division multiple-access (CDMA) schemes appear to be very promising access techniques for coping with the requirements of third-generation mobile systems, mainly because of their flexibility. This paper proposes an ...

    • Adaptive s-aloha cdma as an alternative way of integrating services in mobile environments 

      Sallent Roig, Oriol; Agustí Comes, Ramon (2000-05)
      Article
      Accés obert
      Code-division multiple-access (CDMA) schemes appear to be very promising access techniques for coping with the requirements of third-generation mobile systems, mainly because of their flexibility. This paper proposes an ...

    • Adaptive schemes for packet data in a ds-cdma environment 

      Sallent Roig, Oriol; Agustí Comes, Ramon (IEEE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC., 1997)
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      This paper presents a novel adaptive DS-CDMA slotted-ALOHA packet random access scheme for improving the throughput of the conventional DS-CDMA slotted-ALOHA system. For this purpose a mobile-assisted algorithm is envisaged ...

    • Admission control for multi-tenant radio access networks 

      Pérez Romero, Jordi; Sallent Roig, Oriol; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon (2017)
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      The sharing of Radio Access Networks is gaining momentum in small cell scenarios, due to the associated reduction in capital and operational costs. In this scenario, the split of radio resources among tenants sharing the ...

    • Advanced spectrum management for the downlink of WCDMA systems using genetic algorithms 

      Nasreddine, Jad Nayef; Pérez Romero, Jordi; Sallent Roig, Oriol (2009)
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      In this paper, we propose an advanced spectrum management approach for the downlink of WCDMA systems using genetic algorithms and the concept of coupling matrix, which is able to capture inter-cell interactions. Simulation ...