Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 347 results
  • A cognitive management framework for spectrum selection

     Bouali, Faouzi; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    Computer networks
    Date of publication: 2013-10-04
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 for spectrum selection (SS). It relies on a knowledge manager (KM) retaining a set of advanced statistics that track the suitability of spectral resources to support a set of heterogeneous applications under varying interference conditions. Based on this architecture, a novel proactive strategy is proposed for both SS and spectrum mobility (SM) functionalities. The required interactions between the proposed decision-making processes are described, and their capability to exhibit robustness to unexpected changes in the radio environment is highlighted. The results show that the proposed strategy efficiently exploits the KM support for low loads, while the SM functionality introduces significant gains for high loads with respect to other strategies. Finally, to assess the practicality of the proposed approach, the signaling requirements in the radio interface are evaluated. © 2013 Elsevier B.V. All rights reserved.

  • A fittingness factor-based spectrum management framework for cognitive radio networks

     Bouali, Faouzi; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    Wireless personal communications
    Date of publication: 2013-03
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 fittingness factor concept to capture the suitability of spectral resources exhibiting time-varying characteristics to support a set of heterogeneous CR applications. First, a new knowledge management functional architecture for optimizing spectrum management has been constructed. It integrates a set of advanced statistics capturing the influence of the dynamic radio environment on the fittingness factor. Then, a knowledge manager (KM) exploiting these statistics to monitor time-varying suitability of spectrum resources has been proposed to support the spectrum selection (SS) decision-making process. In particular, a new Fittingness Factor-based strategy combining two SS and spectrum mobility (SM) functionalities has been proposed, following either a greedy or a proactive approach. Results have shown that, with a proper fittingness factor function, the greedy approach efficiently exploits the KM support at low loads and the SM functionality at high loads to introduce significant gains in terms of the user dissatisfaction probability. The proactive approach has been shown to maintain the introduced performance gain while minimizing the signalling requirements in terms of spectrum handover rate.

  • Energy and spectral efficiencies tradeoff with filter optimization in multiple access interference-aware networks

     Souza, Alvaro R.C.; Abrao, Taufik; Sampaio, Lucas H.; Jeszensky, Paul Jean E.; Pérez Romero, Jordi; Casadevall Palacio, Fernando-jose
    Transactions on Emerging Telecommunications Technologies
    Date of publication: 2013-08
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In this contribution, the optimised deployment of both spectrum and energy resources scarcely available in the mobile multiple access systems has been analysed, with special attention to the impact of the filter design on the energy efficiency (EE) of code division multiple access networks. Putting into perspective two conflicting metrics, namely throughput maximisation and power consumption minimisation, the distributed EE utility function is formulated. We also show that the best EE versus spectral efficiency trade-off is achievable when each node allocates exactly the power necessary to attain the maximum EE. In order to demonstrate the validity of our analysis, a low-complexity energy-spectral-efficient algorithm based on distributed instantaneous signal-to-interference-plus-noise ratio level is developed, and the impact of single and multi-user detection filters on the EE¿spectral efficiency trade-off is extensively analysed by numerical simulation.

  • Exploiting knowledge management for supporting multi-band spectrum selection in non-stationary environments

     Bouali, Faouzi; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    IEEE transactions on wireless communications
    Date of publication: 2013-12
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper proposes a new knowledge management framework for spectrum selection under non-stationary conditions supporting a set of applications with heterogeneous requirements. In this respect, an optimization problem is formulated to maximize an aggregate utility function that captures the suitability of spectrum portions with respect to the various application requirements and a set of preferences for using the different spectrum bands. Motivated by the practical limitations when solving the considered problem directly, an alternative solution is proposed. It exploits a statistical characterization of the environment retained in the knowledge database of the proposed framework. To cope with the non-stationarity of the environment, a reliability tester is proposed to detect relevant changes in radio conditions, and update database statistics accordingly. Then, a knowledge manager exploiting these statistics is developed to monitor the time-varying suitability of spectrum resources. Based on this, a novel spectrum management is proposed to approximate the optimal solution of the considered problem. The results obtained in a realistic digital home reveal that, under stationary conditions, the proposed strategy performs very close to the optimal solution with much less requirements in terms of spectrum reconfiguration and measurement reporting. Furthermore, thanks to the reliability tester support, substantial robustness is shown when interference conditions become non-stationary, thus proving the practicality of the proposed solution.

  • Multi-band spectrum selection framework based on partial observations

     Pérez Romero, Jordi; Raschella, Alessandro; Sallent Roig, Jose Oriol; Umbert Juliana, Anna
    IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks
    Presentation's date: 2013-07
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The demand for higher data rates, capacity and better Quality of Service (QoS) is constantly growing; therefore, there is a pressing need for efficient use of wireless network resources. In this context, the application of Cognitive Radio (CR) principle has emerged as a solution to the problem of spectrum scarcity. In this respect, this paper presents an algorithm that enables multi-band spectrum selection for wireless applications under interference variations in the available spectrum blocks. The algorithm is formulated as a Partially Observable Markov Decision Process (POMDP) targeting the maximization of a reward function that captures how suitable each allocated spectrum block is for the data transmission in each radio link depending on the application bit rate requirements.

    The demand for higher data rates, capacity and better Quality of Service (QoS) is constantly growing; therefore, there is a pressing need for efficient use of wireless network resources. In this context, the application of Cognitive Radio (CR) principle has emerged as a solution to the problem of spectrum scarcity. In this respect, this paper presents an algorithm that enables multi-band spectrum selection for wireless applications under interference variations in the available spectrum blocks. The algorithm is formulated as a Partially Observable Markov Decision Process (POMDP) targeting the maximization of a reward function that captures how suitable each allocated spectrum block is for the data transmission in each radio link depending on the application bit rate requirements.

  • On the use of gibbs sampling for inter-cell interference mitigation under partial frequency reuse schemes

     Koutlia, Aikaterini; Pérez Romero, Jordi; Agusti Comes, Ramon; Ziak, Martin
    International Conference on Mobile Services, Resources, and Users
    Presentation's date: 2013-11
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • A testbed platform to demonstrate spectrum selection in opportunistic networks

     Raschella, Alessandro; Umbert Juliana, Anna; Pérez Romero, Jordi; Sallent Roig, Jose Oriol
    Wireless and Mobile Networking Conference
    Presentation's date: 2013-04
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 on reconfigurable devices able to transmit and receive data at different operating frequencies, which are dynamically configured. The software component has been developed to perform the creation and maintenance of ON radio links, including spectrum opportunity identification and selection decision making as well as all the necessary signaling to support the ON operation. Results presented in the paper validate the implementation conducted at the laboratory and illustrate the reconfigurability capabilities of the ON links under different conditions.

  • On the impact of the observation strategy in a POMDP-based framework for spectrum selection

     Raschella, Alessandro; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Umbert Juliana, Anna
    IEEE International Symposium on Personal Indoor and Mobile Radio Communications
    Presentation's date: 2013-09
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Dynamic Spectrum Access, based on the Cognitive Radio (CR) paradigm, is a promising solution to improve the currently inefficient spectrum utilization. In this respect, this paper deals with the spectrum selection problem when a number of radio links has to be established in a CR network. A novel strategy based on a Partially Observable Markov Decision Process (POMDP) is proposed combining partial observations of the interference state together with a statistical characterization of the interference dynamics. In this context, the use of an efficient observation strategy is a key element to account for the trade-off between achieved performance and measurement requirements. For that purpose, the aim of the paper is to propose and evaluate different observation policies for the POMDP-based spectrum selection framework. Results show that the proposed framework is able to achieve very similar performance than a strategy operating under full knowledge of the interference state requiring much less associated signaling.

  • A comparison of different optimisation search methodologies for self-optimisation in wireless cellular networks

     Sanchez Gonzalez, Juan; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    Wireless and Mobile Networking Conference
    Presentation's date: 2013-04
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 formulation of the self-optimisation problem in a cellular wireless network and a description of the optimisation search process by means of iterative algorithms. Different optimisation methodologies, namely simulated annealing, genetic and particle swarm algorithms have been considered. These methodologies have been implemented for the optimisation of the cell coverage and cell overlap using real measurements of a UMTS network deployed in a medium-size European city. These methodologies have been compared in terms of speed of convergence and performance of the solutions provided by the different proposed algorithms.

  • On the use of POMDP for spectrum selection in cognitive radio networks

     Raschella, Alessandro; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Umbert Juliana, Anna
    International Conference on Cognitive Radio Oriented Wireless Networks
    Presentation's date: 2013-07
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Dynamic Spectrum Access is a key capability of Cognitive Radio (CR) networks to increase the efficiency in the use of the available spectrum resources. In this respect, this paper focuses on the spectrum selection problem when a number of radio links has to be established in a CR network to support applications with different bit rate requirements. A novel strategy based on a Partially Observable Markov Decision Process (POMDP) is proposed, whose target is to maximize a reward function that reflects the suitability of the available spectrum blocks to the application requirements. The proposed strategy combines partial observations of the interference state in the different spectrum blocks together with a statistical characterization of the interference dynamics. Thanks to this feature, the performance comparison of the algorithm against different reference strategies reveals that it achieves a very similar performance than a strategy operating under full knowledge of the real interference state of all the spectrum blocks, while at the same time it has much less requirements in terms of measurement needs and associated signaling.

  • Knowledge management framework for robust cognitive radio operation in non-stationary environments

     Bouali, Faouzi; Sallent Roig, Jose Oriol; Pérez Romero, Jordi
    IEEE International Symposium on Personal Indoor and Mobile Radio Communications
    Presentation's date: 2013-09
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    To increase cognitive radio operation efficiency, this paper proposes a new knowledge management functional architecture, based on the fittingness factor concept, for supporting spectrum management in non-stationary environments. It includes a reliability tester module that detects, based on hypothesis testing, relevant changes in suitability levels of spectrum resources to support a set of heterogeneous applications. These changes are captured through a set of advanced statistics stored in a knowledge database and exploited by a proactive spectrum management strategy to assist both spectrum selection and spectrum mobility functionalities. The results reveal that the proposed reliability tester is able to disregard the changes due to the intrinsic randomness of the radio environment and to efficiently detect actual changes in interference conditions of spectrum pools. Thanks to this support, the proposed spectrum management strategy exhibits substantial robustness when the environment becomes non-stationary, obtaining performance improvements of up to 75% with respect to the reference case that does not make use of the reliability tester functionality.

  • Spectrum occupancy in big cities - comparative study: measurement campaigns in Barcelona and Poznan

     Kliks, Adrian; Kryszkiewicz, Pawel; Pérez Romero, Jordi; Umbert Juliana, Anna; Casadevall Palacio, Fernando-jose
    International Symposium of Wireless Communication Systems
    Presentation's date: 2013-08
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In this paper a comparative study of two measurement campaigns carried out in Barcelona, Spain, and Pozna, Poland, to identify spectrum occupancy in different bands, is presented. In both cases the measurement setup was harmonized to obtain comparable results. The problem of efficient noise floor estimation was also considered and a pragmatic approach that takes into account both internal and ambient noise has been proposed. Obtained results show significant amount of unused spectrum, with similar results for both sites when analyzed globally (average spectrum occupancy of 27% in Pozna¿ and 22% in Barcelona). On the contrary, when going to the detailed analysis of some specific bands, more relevant differences are obtained. These differences have been observed mainly in the Terrestrial TRunked RAdio (TETRA) bands that in Poland are also used by Code Division Multiple Access (CDMA) 450, as well as in the bands of theGlobal System for Mobile communications (GSM) due to the effects of Universal Mobile Telecommunications System (UMTS) refarming in the 900 MHz band.

  • Enhancing cellular coverage through opportunistic networks with learning mechanisms

     Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Agusti Comes, Ramon
    IEEE Global Communications Conference
    Presentation's date: 2013-12
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper focuses on the use of Opportunistic Networks as a candidate solution for extending the coverage of cellular networks when providing high bit rate data services. It is based on establishing a device-to-device (D2D) radio link with another mobile that can provide the connectivity to the infrastructure. Specifically, the paper proposes a novel cognitive solution for the joint selection of node and spectrum to be used in the D2D radio link. It makes use of learning-based mechanisms for supporting the decision-making process taking into account the context information and the application requirements. Simulation results reveal that the performance of the proposed approach is very close to the optimum one. At the same time it is capable of adapting to changes in the scenario, such as the appearance/disappearance of candidate nodes as well as the variability in the interference conditions in the different bands.

  • ML aided context feature extraction for cognitive radio

     Bolea, Liliana; Pérez Romero, Jordi; Agusti Comes, Ramon
    Computer networks
    Date of publication: 2013-10
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    his paper addresses the estimation of different context features of a primary user network, such as transmitters' positions, antenna patterns and directions, and propagation model characteristics. It is based on radio signal strength measurements obtained by a sensor network without any prior knowledge about the configuration of the primary transmitters in terms of antenna types or propagation model. A Maximum Likelihood Aided Context Feature Extraction (MLACFE) method is introduced based on applying image processing and a Maximum Likelihood estimation algorithm over the set of measurements to identify the existing transmitters in the scenario and their parameters. The proposed method can provide a quite similar performance than a classical ML method, in terms of average estimation errors while at the same time reducing the computation time in about three orders of magnitude, for the considered case study

  • A multi-cell multi-objective self-optimisation methodology based on genetic algorithms for wireless cellular networks

     Sanchez Gonzalez, Juan; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    International journal of network management (Online)
    Date of publication: 2013-07
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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, there are still many challenges and dif¿culties when moving from the SON concept to practical implementation. In this context, this paper ¿rst provides a general formulation of the automated optimisation problem and a detailed description of the main challenges and dif¿culties ahead. Then, a generic multi-cell multi-objective self-optimisation methodology based on genetic algorithms is proposed. The proposed framework is formulated in detail for a joint coverage and overlap optimisation problem in a multi-cell scenario. A case study using real measurements of a Universal Mobile Telecommunications System network deployed in a medium-size European city is presented to illustrate the proposed methodology. In the presented case study, the pilot power, antenna tilt and antenna azimuth of the different cells are optimised according to certain cell coverage and cell overlap targets. Results reveal that the genetic-based approach is able to provide optimised solutions that ef¿ciently achieve the desired targets accounting for inter-cell coupling effects.

  • Context discovery in Cognitive Radio Networks

     Bolea, Liliana
    Defense's date: 2013-07-12
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    A Spectrum selection framework for opportunistic networks  Open access

     Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Bouali, Faouzi; Sarvanko, Heli; Matinmikko, Marja; Mustonen, Miia; Lee, Haeyoung; Moessner, Klaus; Vahid, Seiamak
    Future Network and MobileSummit
    Presentation's date: 2012-07-05
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    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 with a knowledge management block that stores and processes information about the spectrum use. Different approaches for spectrum selection are discussed covering specific cases including the capability to aggregate different bands and the possibility to jointly select the spectrum and the network interface. Illustrative results of the proposed framework are presented.

  • Access to the full text
    On demonstrating spectrum selection functionality for opportunistic networks  Open access

     Raschella, Alessandro; Umbert Juliana, Anna; Pérez Romero, Jordi; Sallent Roig, Jose Oriol
    International Conference on Mobile Services, Resources, and Users
    Presentation's date: 2012-10
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    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 on reconfigurable devices able to transmit and receive data at different operating frequencies, which are dynamically configured. The software component has been developed to perform the creation and maintenance of ON radio links, including spectrum opportunity identification and selection decision making as well as all the necessary signaling to support the ON operation. Therefore, the presented platform provides a powerful tool for testing different algorithms in real operational radio environments under various interference conditions, thus enabling to gain deeper insight into the performance of algorithmic solutions, beyond the purely theoretical analyses based on models and/or simulations. Results presented in the paper validate the implementation conducted at the laboratory and illustrate the reconfigurability capabilities of the ON links under different conditions.

  • Exploiting knowledge management for supporting spectrum selection in cognitive radio networks

     Pérez Romero, Jordi; Bouali, Faouzi; Sallent Roig, Jose Oriol; Agusti Comes, Ramon
    International Conference on Cognitive Radio Oriented Wireless Networks
    Presentation's date: 2012-06-19
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Abstract—In order to increase Cognitive Radio operation efficiency, this paper builds up a new knowledge management functional architecture for supporting spectrum management. It integrates the fittingness factor concept proposed by the authors in a prior work and includes a set of advanced statistics capturing the influence of the radio environment. Then, a Knowledge Manager (KM) exploiting these statistics and observed fittingness factor values has been developed to monitor the time-varying suitability of spectrum resources to support heterogeneous services. Based on estimated suitability levels, a new strategy combining Spectrum Selection (SS) and Spectrum Mobility (SM) functionalities has been proposed. Results have shown that the proposed strategy efficiently exploits the KM support at low loads and the SM functionality at high loads to introduce significant gains (ranging from 85% to 100%) w.r.t. a pure random selection while exhibiting substantial robustness to changes in interference levels.

  • Dynamic cooperator selection in cognitive radio networks

     Vucevic, Nemanja; Akyildiz, Ian F.; Pérez Romero, Jordi
    Ad hoc networks
    Date of publication: 2012-07
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The primary objective of cooperation in cognitive radio (CR) networks is to increase the spectrum access efficiency and improve the network performance. However, Byzantine adversaries or unintentional erroneous conduct in cooperation can lead to destructive behavior of CR users that can decrease their own and others’ performances. This work presents a dynamic solution for cooperation reliability in conditions with constraints typical for a CR network. Specifically, in CR networks, the information on the success of cooperation can be limited only to cases with interference; when malicious, cooperators can be completely non-correlated and can alter behavior; and the set of available cooperators can dynamically change in time. In order to face these challenges, each CR user autonomously decides with whom to cooperate by learning cooperators behavior with a reinforcement learning (RL) algorithm. This RL algorithm determines the suitability of the available cooperators, and selects the most appropriate ones to cooperate with the objective to increase the efficiency of spectrum access in CR networks. The simulation results demonstrate the learning capabilities of the proposed solution and especially its reliable behavior under highly unreliable conditions.

  • A solution framework to provide management services for wireless communications in the digital home

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    IEEE communications magazine
    Date of publication: 2012-11
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 entertainment, home automation, home health care and home security and management. Wireless technologies are usually the preferred solution to cope with DH communications for their ease of installation and use. However, expected capacity demand and the lack of coordination between an increasing number of diverse wireless devices in use within the DH is seriously challenging the performance and usability of wireless technologies. This article outlines a novel technical solution intended to enhance capacity and quality of DH wireless communications. The proposed solution establishes a radio-independent coexistence framework where key operational radio settings of DH devices are coordinately determined, and new spectrum sources other than traditional ISM bands can be exploited for DH communications. The addressed solution enables a business player to offer management services for DH wireless communications so that ordinary users can be relieved of complex management tasks likely to arise within the DH. The article discusses how potential management service providers could benefit from the proposed solution. Besides, the functional architecture of the proposed solution together with the set of procedures necessary for the management of the DH wireless communications are outlined. A realistic indoor scenario is presented as an illustrative use case to show how proper decision making logic in managing the DH could improve the efficiency by selecting the most suitable spectrum for in-house wireless communications. Finally, the main implementation issues are identified and discussed in order to outline a feasible roadmap.

  • Self-organized Femtocells: a Time Difference Learning Approach

     Galindo Serrano, Ana María
    Defense's date: 2012-06-11
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Results analysis and validation : D5.3  Open access

     Moreno, Oscar; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Raschella, Alessandro; Umbert Juliana, Anna; González, José Luis; Gebert, Jens; Fuchs, Rolf; Demestichas, Panagiotis; Georgakopoulos, Andreas; Stavroulaki, Vera; Tsagkaris, Kostas; Kritikou, Yiouli; Tzifa, Lia; Koutsouris, Nikos; Karvounas, Dimitrios; Logothetis, Marios; Sarli, Asimina; Bantouna, Aimilia; Papadopoulou, Louisa-Magdalene; Galani, Aristi; Vlacheas, Panagiotis; Morakos, Petros; Antzoulatos, Alexandros; Mueck, Markus; Drewes, Christian; Tosic, Milenko; Boskovic, Dragan; Cirilovic, Mirko; Vahid, Seiamak; Ghoraishi, Mir; Pega, Stéphane; Bourdellès, Michel; Bagayoko, Abdoulaye; Mouton, Christian; Panaitopol, Dorin; Delsol, Thomas; Nehring, Florian; Moser, Guenter; Ikovic, Ognjen
    Date: 2012-12-31
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Deliverable D5.3 del projecte OneFIT

    Postprint (author’s final draft)

  • Access to the full text
    Final report on dissemination, regulation, standardization, exploitation & training : D6.3  Open access

     Vahid, Seiamak; Matinmikko, Marja; Mustonen, Miia; Demestichas, Panagiotis; Georgakopoulos, Andreas; Stavroulaki, Vera; Tsagkaris, Kostas; Kritikou, Yiouli; Tzifa, Lia; Koutsouris, Nikos; Karvounas, Dimitrios; Logothetis, Marios; Sarli, Asimina; Bantouna, Aimilia; Papadopoulou, Louisa-Magdalene; Galani, Aristi; Vlacheas, Panagiotis; Morakos, Petros; Antzoulatos, Alexandros; Bender, Paul; Gebert, Jens; Tosic, Milenko; Filo, Marcin; Mouton, Christian; Mueck, Markus; Sarvanko, Heli; Bourdellès, Michel; Pega, Stéphane; Moreno, Oscar; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Schmidt, Andreas
    Date: 2012-12-31
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Deliverable D6.3 del projecte OneFIT

    In D6.1 deliverable project dissemination, exploitation and training plans, as well as standardization & regulatory approach strategy was presented. The D6.2 reported on the necessary updates of these strategies and the actions taken by the partners in line with them, as well as the obtained results. In this D6.3 deliverable, a full set of project dissemination activities, standardization & regulatory contributions as well as an operator’s “cook book” outlining steps necessary for full deployment of ON functionality and services, are presented.

    Postprint (author’s final draft)

  • Access to the full text
    Performance evaluation of synergic operation of algorithms enabling opportunistic networks - D4.3  Open access

     Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Bouali, Faouzi; Ferrús Ferré, Ramon; Agusti Comes, Ramon; Gebert, Jens; Fuchs, Rolf; Demestichas, Panagiotis; Georgakopoulos, Andreas; Stavroulaki, Vera; Kritikou, Yiouli; Tzifa, Lia; Koutsouris, Nikos; Karvounas, Dimitrios; Logothetis, Marios; Sarli, Asimina; Papadopoulou, Louisa-Magdalene; Galani, Aristi; Vlacheas, Panagiotis; Morakos, Petros; Antzoulatos, Alexandros; Tosic, Milenko; Boskovic, Dragan; Chen, Xianfu; Pega, Stéphane; Bourdellès, Michel; Vahid, Seiamak; Bagayoko, Abdoulaye; Mouton, Christian; Delsol, Thomas; Panaitopol, Dorin; Ainwaimi, Ghassan; Tsagkaris, Kostas; Sarvanko, Heli; Cirilovic, Mirko; Riaz, Maryam; Lee, Haeyoung; Moreno, Oscar; Bantouna, Aimilia
    Date: 2012-12-31
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Deliverable D4.3 del projecte OneFIT

  • Network of Excellence in Wireless COMmunications #

     Pascual Iserte, Antonio; Pérez Neira, Ana Isabel; Najar Marton, Montserrat; Agusti Comes, Ramon; Umbert Juliana, Anna; Casadevall Palacio, Fernando-jose; Pérez Romero, Jordi
    Participation in a competitive project

     Share

  • Access to the full text
    D5.2 - Evaluation of selected measurement-based techniques  Open access

     Pérez Romero, Jordi; Akyildiz, Ian F.; Agusti Comes, Ramon; Sallent Roig, Jose Oriol; Bouali, Faouzi; Achtzehn, Andreas; Li, Xia; Mähönen, Petri; Nasreddine, Jad; Riihijärvi, Janne; Zalonis, Andreas; Dimitriou, Nikos; Polydoros, Andreas; Iacobelli, Lorenzo; Le Martret, Christophe; Herry, Sebastien; Cai, Tao; Farnham, Tim; Cao, Fengming; Subramani, Siva
    Date: 2012-02
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Deliverable D5.2 del projecte FARAMIR

  • Performance assessment & synergic operation of algorithmic solutions enabling opportunistic networks¿ D4.2

     Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Bouali, Faouzi; Ferrús Ferré, Ramon; Karvounas, Dimitrios; Georgakopoulos, Andreas; Stavroulaki, Vera; Demestichas, Panagiotis; Tosic, Milenko; Boskovic, Dragan; Matinmikko, Marja; Fuchs, Rolf; Gebert, Jens; Vahid, Seiamak; Bourdellès, Michel; Riaz, Maryam; Alnwaimi, Ghassan; Shariat, Shahin; Bagayoko, Abdoulaye; Mouton, Christian; Rakotoharison, Lanto; Tsagkaris, Kostas; Sarvanko, Heli; Panaitopol, Dorin; Lee, Haeyoung; Moreno, Oscar
    Date: 2012-06
    Report

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Protocols, performance assessment and consolidation on interfaces for standardization ¿ D3.3  Open access

     Filo, Marcin; Wierzbowsi, Tomasz; Gebert, Jens; Wich, Andreas; Jactat, Caroline; Lécroart, Benoit; Mouton, Christian; Haeyoung, Lee; Vahid, Seiamak; Bouali, Faouzi; Ferrús Ferré, Ramon; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Demestichas, Panagiotis; Georgakopoulos, Andreas; Karvounas, Dimitrios; Koutsouris, Nikos; Stavroulaki, Vera; Tsagkaris, Kostas; Matinmikko, Marja; Sarvanko, Heli
    Date: 2012-06
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The following document presents a detailed description of the protocol for the “ Control Channels for the Cooperation of the Cognitive Management System ” (C4MS) which provides the necessary means to enable proper management of Opportunistic Networks. Additionally, the document defines the methodology that was applied for the purpose of signalling evaluation. The protocol overview presented in section 2 of the main document, provides the C4MS principles. The section includes, among others, the description of the protocol identifiers, procedures, protocol state machines and message format as well as the security asp ects. Section 3 provides a high-level description of the data structures defined within the scope of OneFIT project. The data structures are classified into five categories, i.e.: Profiles, Context, Decisions,Knowledge and Policies. The high level description is complemented by some detailed data structures in the Appendix to D3.3 Section 3[10]. Section 4 provides details on the evaluation methodology applied for the purpose of C4MS performance assessment. The section presents the evaluation plan along with a description of metrics that are to be exploited in the scope of WP3. Section 5 and Section 6 are composed of the signalling evaluation results. Section 5 focuses on the estimation of the signalling load imposed by ON management in different ON phases. Additionally some results for the initialization phase (not explicitly mentioned in the previous phases of the project)and security related aspects are also depicted. Section 6 on the other hand is focused on the evaluation of the signalling traffic generated by different ON related algorithms. Conclusions to the document are drawn in section 7. Detailed description of the C4MS procedures, implementation options based on IEEE 802.21, DIAMTER and 3GPP are depicted in the appendix to the D3.3[10] . Additionally, the appendix incorporates the detailed definition of the information data structures and final set of Message Sequence Charts (MSCs) provided for the OneFIT project.

  • Access to the full text
    Validation platform implementation description ¿ D5.2  Open access

     Tosic, Milenko; Ikovic, Ognjen; Boskovic, Dragan; Cirilovic, Mirko; Gebert, Jens; Fuchs, Rolf; Wich, Andreas; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Ferrús Ferré, Ramon; Raschella, Alessandro; Karvounas, Dimitrios; Georgakopoulos, Andreas; Stavroulaki, Vera; Koutsouris, Nikos; Demestichas, Panagiotis; Mueck, Markus; Drewes, Christian; Tsagkaris, Kostas; Mouton, Christian; González, José Luis; Delsol, Thomas; Moreno, Oscar; Moser, Guenter
    Date: 2012-06
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Deliverable D5.2 del projecte OneFIT

  • Access to the full text
    D6.2 - Prototype description and field trial results  Open access

     Casadevall Palacio, Fernando-jose; Pérez Romero, Jordi; Gavrilovska, Liljana; Atanasovski, Vladimir; Denkovski, Daniel; Rakovic, Valentin; Pavloski, Mihajlo; Iacobelli, Lorenzo; Fouillot, Pascale; Dagres, Ioannis; Polydoros, Andreas; van de Beek, Jaap; Lidström, Erik; Cai, Tao; Dejonghe, Antoine; Farnham, Tim; Hau Chin, Woon; Ramos, Filipe; Faies, Mohammed; Sayrac, Berna; Ansari, Junaid; Meshkova, Elena; Mähönen, Petri; Nasreddine, Jad; Riihijärvi, Janne; Wang, Peng
    Date: 2012-06
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Deliverable D6.2 del projecte FARAMIR

  • Applications of Cognitive Radio Networks

     Pérez Romero, Jordi; Doyle, L.; Vuran, M.C.
    IEEE Vehicular technology magazine: connecting the Mobile world
    Date of publication: 2012-06
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Automatic detection of sub-optimal performance in UMTS networks based on drive-test measurements

     Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Sanchez Gonzalez, Juan; Agusti Comes, Ramon; Díaz-Guerra, Miguel Ángel; Henche, David; Paul, Daniel
    International Conference on Network and Service Management
    Presentation's date: 2011-10
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Strengthening radio environment maps with primary-user statistical patterns for enhancing cognitive radio operation

     Bouali, Faouzi; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications
    Presentation's date: 2011-06
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 order to fulfill this constraint while optimising spectrum utilisation, it is important to get knowledge about primary-user activity in order to devise proper strategies for secondary-user operation. In this context, this paper proposes to strengthen Radio Environment Maps (REM) with statistical patterns of primary systems that capture among others temporal dependence structures between activity (ON) and inactivity (OFF) periods. Convergence times for the different statistics are analysed. Then, a set of novel spectrum selection criteria exploiting these statistics are proposed and assessed to benchmark the usefulness of primary statistical patterns retained in the REM. Results show that significant performance gains can be achieved in terms of a reduction in the number of required spectrum hand-overs.

  • A novel spectrum selection strategy for matching multi-service secondary traffic to heterogeneous primary spectrum opportunities

     Bouali, Faouzi; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    IEEE International Symposium on Personal Indoor and Mobile Radio Communications
    Presentation's date: 2011-09
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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, this paper proposes to exploit a statistical characterisation of Primary User (PU) activity to be retained in Radio Environment Maps (REMs) for spectrum selection purposes. The objective is to match multiservice secondary traffic to heterogeneous primary spectrum opportunities minimizing the SpHO (Spectrum handOver) rate. Specifically focusing on dependence structures potentially exhibited by primary ON/OFF periods, two spectrum selection criteria have been first proposed to benchmark the utility of the embedded statistical patterns in the REM. Results have shown that the one or the other criterion can introduce significant gains with respect to a random selection depending on the secondary configuration and characteristics of PUs. Therefore, a novel pro-active spectrum selection strategy combining the proposed criteria has been developed and proven to achieve in most of the cases the best performance for a given secondary service mix and the dependence level between primary ON/OFF periods.

  • Access to the full text
    System architecture in cognitive radio networks using a radio environment map  Open access

     Vizziello, Anna; Pérez Romero, Jordi
    International Conference on Cognitive Radio and Advanced Spectrum Management
    Presentation's date: 2011-10
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Cognitive Radio (CR) is considered as a promising solution to improve wireless spectrum utilization. Moreover, through optimization frameworks, Radio Resource Management (RRM) procedures are designed to enhance the efficient utilization of resources in CR networks. To face this issue in a holistic perspective, the RRM solutions should take into account not only the optimization task but also their impact on the design task. Thus, in this paper, a system architecture of a novel RRM is proposed for CR networks. In particular, it is fundamental to construct flexible systems to work across heterogeneous systems and help realize their full potential. Therefore, in the proposed system, heterogeneous Primary Users (PUs) with multiple features and variable CR demands are considered. A Radio Environment Map (REM) is used to obtain the required PU features, which are exploited to improve the adaptability in CR networks and, thus, to design an efficient Cognitive RRM. The functionalities of the network elements are described in detail, along with the message exchange to carry out the resource management.

  • Context discovery mechanisms for cognitive radio

     Bolea, Liliana; Pérez Romero, Jordi; Agusti Comes, Ramon; Sallent Roig, Jose Oriol
    IEEE Vehicular Technology Conference
    Presentation's date: 2011-05
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper addresses the estimation of different context parameters of a primary user network based on signal strength measurements obtained by a sensor network and without any prior knowledge of the antenna types used by primary transmitter or the propagation model. The obtained context information can be stored in a database like a Radio Environment Map (REM) and be used to decide the appropriate configuration of a secondary cognitive radio network. Proposed methodology is based on applying image processing over the set of measurements to identify the existing transmitters in the scenario and their parameters such as position, antenna pattern and propagation model.

  • On the role of spectrum selection to improve coverage extension through opportunistic networks

     Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Agusti Comes, Ramon
    International Symposium on Wireless Personal Multimedia Communications
    Presentation's date: 2011-10
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    A framework based on a fittingness factor to enable efficient exploitation of spectrum opportunities in cognitive radio networks  Open access

     Bouali, Faouzi; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    International Symposium on Wireless Personal Multimedia Communications
    Presentation's date: 2011-10
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    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 that captures the suitability of spectral resources exhibiting time-varying characteristics to support a set of heterogeneous CR applications. Different fittingness factor functions to track unknown variations of interference levels are formulated and analysed. First, the dependency with traffic load is studied and second, the impact over the spectrum selection decision-making process in a multiservice CR context is evaluated. Results show that, even with a simple greedy approach, the fittingness factor concept can result in an efficient matching of spectral resources to the requirements of CR applications, thus resulting in significant reduction in the user dissatisfaction probability.

    Postprint (author’s final draft)

  • Access to the full text
    Received signal interpolation for context discovery in cognitive radio  Open access

     Bolea, Liliana; Pérez Romero, Jordi; Agusti Comes, Ramon
    International Symposium on Wireless Personal Multimedia Communications
    Presentation's date: 2011-10
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This paper addresses the context acquisition to characterize different features of a primary network based on the power measurements obtained by a sensor network. In particular, it presents a comparative study of the impact of natural neighbor, linear, and nearest neighbor interpolation techniques carried out over the measurements at different geographical positions. Extracted features include transmitter position, antenna pattern or propagation model. An evaluation is carried out in scenarios including the effect of both correlated and non-correlated shadowing.

    Postprint (author’s final draft)

  • Intercell interference management in OFDMA networks: a decentralized approach based on reinforcement learning

     Bernardo, Francisco; Agusti Comes, Ramon; Pérez Romero, Jordi; Sallent Roig, Jose Oriol
    IEEE transactions on systems man and cybernetics Part C-applications and reviews
    Date of publication: 2011-11
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Reinforcement learning for joint radio resource management in LTE-UMTS scenarios

     Vucevic, Nemanja; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Agusti Comes, Ramon
    Computer networks
    Date of publication: 2011-05-16
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Flexible Spectrum Access for Opportunistic Secondary Operation in Cognitive Radio Networks

     Gelabert Doran, Xavier; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    IEEE transactions on communications
    Date of publication: 2011-10
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • ADAPTIVE RADIO RESOURCE MANAGEMENT FOR OFDMA-BASED MACRO- AND FEMTOCELL NETWORKS  Open access

     Bezerra Rodrigues, Emanuel
    Defense's date: 2011-07-06
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Las demandas y expectativas de los usuarios y operadores móviles crecen sin parar y, consecuentemente, los nuevos estándares han incorporado tecnologías de acceso de radio cada vez más eficientes. Las especificaciones IMT-Advanced para la cuarta generación (4G) de redes móviles de banda ancha requieren, entre otras cosas, tasas más altas de transmisión de datos, del orden de 100 Mbps a 1 Gbps, dependiendo del nivel de movilidad. Para conseguir éstas tasas se ha escogido como tecnología de acceso el Acceso Múltiple por División de Frecuencias Ortogonal (OFDMA), y se han considerado femtoceldas para mejorar la cobertura de espacios interiores. Para explorar completamente la flexibilidad de estas tecnologías y utilizar los escasos recursos radio de la manera más eficiente posible se requieren técnicas de Gestión de Recursos Radio (RRM) adaptativas e inteligentes. En el ámbito de los sistemas celulares basados en OFDMA, uno de los problemas todavía no resuelto es el compromiso que existe entre la eficiencia en la utilización de los recursos y la equidad en su distribución entre los usuarios de la red. El compromiso entre eficiencia y equidad aparece cuando los recursos radio asignados dan lugar a diferentes indicadores de eficiencia con respecto a los distintos usuarios de red (diversidad multi-usuario). El uso de una asignación de recursos oportunista, para explorar estas diversidades y maximizar la capacidad, causa situaciones de desigualdad en la distribución de los recursos. Por otro lado, los esquemas de RRM que propician equidad absoluta consideran un escenario de peor caso, penalizando a los usuarios con mejores condiciones y reduciendo la capacidad del sistema. En esta tesis, se han propuesto varias políticas y técnicas de RRM para balancear este compromiso en el contexto de redes macrocelulares y femtocelulares. En el caso particular de sistemas macrocelulares, proponemos un nuevo paradigma de gestión de red basado en el control del índice de equidad de la celda en escenarios con servicios de tiempo no-real y de tiempo real. Se han estudiado dos enfoques para el control de la equidad: control instantáneo (a corto plazo) utilizando técnicas de RRM de adaptación de tasa y equidad, y control promediado (a mediano plazo) utilizando estructuras de RRM basadas en la Teoría de la Utilidad. En el caso de las femtoceldas, se ha formulado una nueva técnica para evitar la interferencia capaz de balancear el compromiso entre eficiencia espectral y la equidad entre los puntos de acceso de las femtoceldas. Esta estrategia de RRM se basa en una planificación a mediano/largo plazo de las frecuencias disponibles, que toma en consideración la topología de interferencia de grupos de femtoceldas vecinas. Las técnicas de RRM consideradas en esta tesis se han evaluada utilizando de forma sistemática técnicas de simulación numéricas a nivel de sistema. En el caso del escenario macrocelular, se demuestra que las técnicas adaptativas de RRM propuestas son, para los operadores móviles una, herramienta valiosa porqué, además de ser una generalización de estrategias clásicas bien conocidas, son capaces de garantizar de forma eficiente diferentes niveles de equidad en el sistema, y controlar el compromiso entre eficiencia y equidad. Además, se concluye que las estrategias basadas en la teoría de utilidad, que hacen un control promedio de la equidad, muestran resultados tan buenos ó incluso mejores que los presentados por las técnicas basadas en optimización instantánea de la adaptación de la tasa y la equidad, utilizando menores recursos computacionales. Finalmente, se demuestra que la técnica propuesta para evitar interferencia en redes de femtoceldas puede garantizar una coexistencia sin degradaciones entre punto de acceso vecinos para cualquier topología de interferencia. Esta técnica puede ser implementada mediante arquitecturas de red distribuidas ó centralizadas, presentando en ambos casos unos requisitos de señalización muy bajos.

    User and cellular operator requirements and expectations have been continuously evolving, and consequently, advanced radio access technologies have emerged. The International Mobile Telecommunications - Advanced (IMT-Advanced) specifications for mobile broadband Fourth Generation (4G) networks state, among other requirements, that enhanced peak data rates of 100 Mbps and 1 Gbps for high and low mobility should be provided. In order to achieve this challenging performance, Orthogonal Frequency Division Multiple Access (OFDMA) has been chosen as the access technology, and femtocells have been considered for improving indoor coverage. In order to fully explore the flexibility of these technologies and use the scarce radio resources in the most efficient way possible, intelligent and adaptive Radio Resource Management (RRM) techniques are crucial. There are many open RRM problems in wireless networks in general and OFDMA-based cellular systems in particular. One of such problems is the fundamental trade-off that exists between efficiency in the resource usage and fairness in the resource distribution among network players. Several opportunistic RRM algorithms, which dynamically allocate the resources to the network players that present the highest efficiency indicator with regard to these resources, have been proposed to maximize the efficiency in the resource usage. The trade-off between efficiency and fairness appears when the resources have different efficiency indicators to different network players (multi-user or multi-cell diversity). The use of opportunistic resource allocation to explore these diversities causes unfair situations in the resource distribution. On the other hand, schemes that provide absolute fairness deal with the worst case scenario, penalizing players with better condition and reducing the system capacity. In this thesis, several RRM policies and techniques are proposed to balance this compromise in macrocell and femtocell networks. In the particular case of macrocell systems, we propound a new network management paradigm based on the control of a cell fairness index in scenarios with Non-Real Time (NRT) or Real Time (RT) services. Two fairness control approaches are studied: instantaneous (short-term) control by means of generalized fairness/rate adaptive RRM techniques and average (mid-term) control using utility-based frameworks. For femtocell networks, a novel interference avoidance technique able to balance the trade-off between spectral efficiency in the femtocell tier and fairness among the Femtocell Access Points (FAPs) is formulated. This RRM strategy is based on a high-level, mid/long-term frequency planning that takes into account the topology of groups of neighboring FAPs. The RRM techniques considered in this thesis are evaluated by means of extensive system-level and/or numerical simulations. Regarding the macrocell scenario, it is shown that the proposed adaptive RRM techniques are valuable tools for the mobile operators, because they are generalizations of well-known classic strategies found in the literature and they can effectively guarantee different fairness levels in the system and control the trade-off between efficiency and fairness. Furthermore, it is concluded that the utility-based strategies that perform an average fairness control can provide performance results as good as the fairness/rate adaptive techniques, which are based on instantaneous optimization, using less computational resources. Finally, it is demonstrated that the proposed interference avoidance technique for femtocell networks can guarantee a seamless coexistence between neighboring FAPs in any interference topology. Furthermore, this technique can be implemented in both centralized and distributed network architectures and generates very low signaling overhead.

  • Access to the full text
    Formulations and identification of algorithmic solutions for enabling opportunistic networks - M4.1  Open access

     Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Bouali, Faouzi; Ferrús Ferré, Ramon; Agusti Comes, Ramon; Logothetis, Marios; Georgakopoulos, Andreas; Stavroulaki, Vera; Demestichas, Panagiotis; Bourdellès, Michel; Pega, Stéphane; Gebert, Jens; Tsagkaris, Kostas
    Date: 2011-04-30
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This document contains a detailed description of the algorithms to be implemented to manage the opportunistic networks. There are defined according to the functional and system architecture (WP2) to fulfil the technical challenges. These algorithms will implemented during the WP4.2 and validated during the WP4.3

    Milestone M4.1 del projecte Europeu OneFIT (ICT-2009-257385).

  • Access to the full text
    DI5.3 Vision Book (NEWCOM++)  Open access

     Benedetto ., Sergio; Bogucka, Hanna; Corazza, Giovanni E.; Correia, Luis; Duhamel, Pierre; Noguet, Dominique; Palazzo, Sergio; Pérez Romero, Jordi; Polydoros, Andreas; Koutsopoulos, Iordanis
    Date: 2011-03
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This Report constitutes the final version of the NEWCOM++ Vision Book. In it, the community of NEWCOM++ researchers, shaped under the common ground of a mainly academic network of excellence, have tried to distil their scientific wisdom in a number of areas characterised by the common denominator of wireless communications, by identifying the medium-long term research tendencies/problems, describing the tools to face them and providing a relatively large number of references for the interested reader. The identified areas and the researchers involved in their redaction reflect the intersection of the major topics in wireless communications with those that are deeply investigated in NEWCOM++; they are preceded by an original description of the main trends in user/society needs and the degree of fulfilment that ongoing and future wireless communications standards will more likely help achieving. In the Appendix, a list of “Millenium Problems” is listed. They are a selected number of seminal problems in wireless communication networks, characterized by being crucial and still unsolved, as identified by the NEWCOM++ community of researchers.

    Deliverable DI5.3 del projecte europeu NEWCOM++

  • Access to the full text
    Radio environmental maps: information models and reference model. Document number D4.1  Open access

     Dagres, Ioannis; Polydoros, Andreas; Riihijärvi, Janne; Nasreddine, Jad; Mähönen, Petri; Gavrilovska, Liljana; Atanasovski, Vladimir; van de Beek, Jaap; Sayrac, Berna; Grimoud, Sebastien; López Benítez, Miguel; Pérez Romero, Jordi; Agusti Comes, Ramon; Casadevall Palacio, Fernando-jose
    Date: 2011-04-30
    Report

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    We describe herein the envisioned improvements of the REMs due to advanced sensing and processing. In relation to that, we also discuss the underlying modelling assumptions. Finally, we comment on how REMs can be of use in different scenarios as established in WP2.

    Deliverable D4.1 del projecte Europeu FARAMIR (248351)

  • Prototype requirement analysis. Document Number D6.1

     Gavrilovska, Liljana; Atanasovski, Vladimir; Denkovski, Daniel; Rakovic, Valentin; Pavloski, Mihajlo; van de Beek, Jaap; Iacobelli, Lorenzo; Van Wesemael, Peter; Sayrac, Berna; López Benítez, Miguel; Casadevall Palacio, Fernando-jose; Agusti Comes, Ramon; Pérez Romero, Jordi; Mähönen, Petri; Riihijärvi, Janne
    Date: 2011-02-28
    Report

     Share Reference managers Reference managers Open in new window

  • Acceso radio cognitivo y oportunista

     Raschella, Alessandro; Bouali, Faouzi; Bolea, Liliana; Sanchez Gonzalez, Juan; Umbert Juliana, Anna; Ferrús Ferré, Ramon; Casadevall Palacio, Fernando-jose; Agusti Comes, Ramon; Pérez Romero, Jordi; Sallent Roig, Jose Oriol
    Participation in a competitive project

     Share

  • Rolling Dissemination and Exploitation Plan and Report (M24). Document Number D7.2

     Mähönen, Petri; Riihijärvi, Janne; Subramani, Siva; Farnham, Tim; Gavrilovska, Liljana; van de Beek, Jaap; Zalonis, Andreas; Polydoros, Andreas; Sayrac, Berna; Cordier, Pascal; Pérez Romero, Jordi; Iacobelli, Lorenzo; Dejonghe, Antoine; Van Wesemael, Peter
    Date: 2011-12
    Report

     Share Reference managers Reference managers Open in new window