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  • Public safety mobile broadband: a techno-economic perspective

     Ferrús Ferré, Ramon; Pisz, Rafal; Sallent Roig, Jose Oriol; Baldini, Gianmarco
    IEEE Vehicular technology magazine: connecting the Mobile world
    Date of publication: 2013-06
    Journal article

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    Wireless communications are critical to supporting the operational capabilities of public protection and disaster relief (PPDR) organizations. The private/professional mobile radio (PMR) technologies currently used for PPDR communications offer a rich set of voice-centric services [e.g., push-to-talk (PTT) group calls] but have very limited data transmission capabilities and are unable to cope with increasing demands in the PPDR community for mobile data-centric applications. Introducing PPDR mobile broadband communications faces a number of technical and economic/business challenges. It is believed that the current paradigm for PPDR communications provisioning based on dedicated technologies, dedicated networks, and dedicated spectrum no longer constitutes the main approach for introducing PPDR mobile broadband, and hence new paradigms and innovative solutions are needed. Thus, this article first identifies and discusses the main techno-economic drivers across the technology, network, and spectrum dimensions that are anticipated to lay the foundations for future PPDR communications to be efficient and cost-effective. Then, relevant estimations and illustrative figures are provided to add perspective and valuable insight into the economic roots of the envisioned future PPDR mobile broadband communications.

    Wireless communications are critical to supporting the operational capabilities of public protection and disaster relief (PPDR) organizations. The private/professional mobile radio (PMR) technologies currently used for PPDR communications offer a rich set of voice-centric services [e.g., push-to-talk (PTT) group calls] but have very limited data transmission capabilities and are unable to cope with increasing demands in the PPDR community for mobile data-centric applications. Introducing PPDR mobile broadband communications faces a number of technical and economic/business challenges. It is believed that the current paradigm for PPDR communications provisioning based on dedicated technologies, dedicated networks, and dedicated spectrum no longer constitutes the main approach for introducing PPDR mobile broadband, and hence new paradigms and innovative solutions are needed. Thus, this article first identifies and discusses the main techno-economic drivers across the technology, network, and spectrum dimensions that are anticipated to lay the foundations for future PPDR communications to be efficient and cost-effective. Then, relevant estimations and illustrative figures are provided to add perspective and valuable insight into the economic roots of the envisioned future PPDR mobile broadband communications.

  • 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

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    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.

  • 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

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    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.

  • 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
    Date of publication: 2013-07
    Journal article

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    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.

  • LTE: the technology driver for future public safety communications

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Baldini, Gianmarco; Goratti, Leonardo
    IEEE communications magazine
    Date of publication: 2013-10-07
    Journal article

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    The current Private/Professional Mobile Radio (PMR) technologies used for PPDR communications offer a rich set of voice-centric services but have very limited data transmission capabilities, which are unable to handle the increasing PPDR community demand for a wider range of data-centric services. Though some efforts have been devoted to upgrade PMR technologies with better data transfer capabilities, the progression towards an enhanced mobile broadband PMR standardized solution still lags behind the achievements made in the commercial wireless industry, which recently culminated in Long- Term Evolution (LTE) technology. Because of this contrasting progress, the adoption of commercial mainstream LTE technology to satisfy the PPDR community's data communication needs is gaining momentum and offers significant opportunities to create and exploit the synergies between the commercial and PPDR domains, which have remained almost entirely separate to date. In this context, this paper first discusses the suitability of LTE and related technologies for mobile broadband PPDR service provisioning. Next, it presents the argument that the most plausible future scenarios to deliver the increasingly data-intensive applications demanded by the PPDR agencies are expected to rely on the use of both dedicated and commercial LTE-based mobile networks. From this basis, the paper proposes a system architecture solution for PPDR service provisioning that enables PPDR service access through dedicated and commercial networks in a secure and interoperable manner and ensures proper allocation of the networks' capacity to PPDR applications through the dynamic management of prioritization policies. In addition, the spectrum related issues that are central to the proposed PPDR service provisioning solution are addressed, and a solution based on the joint e- ploitation of dedicated and shared spectra is proposed.

  • 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

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    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.

  • 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

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    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.

    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.

  • 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

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    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.

    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.

  • Access to the full text
    Visión prospectiva de las comunicaciones móviles de seguridad pública y emergencias  Open access

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Agusti Comes, Ramon
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2013-09-12
    Presentation of work at congresses

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    El acceso a servicios de banda ancha móvil es fundamental para mejorar la eficiencia y efectividad de las comunicaciones de seguridad pública y emergencias. En este artículo se defiende que el modelo de comunicaciones actual, caracterizado por el uso de ¿tecnologías dedicadas, redes dedicadas y espectro dedicado¿, no es válido para sustentar la necesaria evolución de los servicios y sistemas de comunicaciones utilizados hoy en día por las organizaciones PPDR (Public Protection and Disaster Relief). A tal efecto, en el artículo se establecen y desarrollan los tres principios clave que, en opinión de los autores, son fundamentales para posibilitar y cimentar dicha evolución: (1) aprovechamiento de las tecnologías del entorno comercial; (2) explotación de estrategias de compartición de infraestructura y redes; y (3) incorporación de principios de compartición de espectro entre PPDR y otras aplicaciones.

    El acceso a servicios de banda ancha móvil es fundamental para mejorar la eficiencia y efectividad de las comunicaciones de seguridad pública y emergencias. En este artículo se defiende que el modelo de comunicaciones actual, caracterizado por el uso de tecnologías dedicadas, redes dedicadas y espectro dedicado , no es válido para sustentar la necesaria evolución de los servicios y sistemas de comunicaciones utilizados hoy en día por las organizaciones PPDR (Public Protection and Disaster Relief). A tal efecto, en el artículo se establecen y desarrollan los tres principios clave que, en opinión de los autores, son fundamentales para posibilitar y cimentar dicha evolución: (1) aprovechamiento de las tecnologías del entorno comercial; (2) explotación de estrategias de compartición de infraestructura y redes; y (3) incorporación de principios de compartición de espectro entre PPDR y otras aplicaciones.

  • 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

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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 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

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    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.

  • 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

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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 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

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    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.

  • 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

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    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.

  • D2.2.1 - Draft security requirements

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol
    Date: 2013-11-28
    Report

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    Communications security is a central aspect of the ISITEP framework for inter-system interoperability between TETRA and TETRAPOL networks. Ensuring that threats to the interconnected communications systems and terminals are sufficiently and appropriately reduced by technical, procedural and environmental countermeasures is vital to realise the trusted and secure communication system needed for the pursued PPDR transnational cooperation activities. In this context, ISITEP Work Package 2.2 (WP2.2) ¿Security Requirements¿ is aimed at establishing the set of security requirements needed to drive the development of the security architecture and its components. This first deliverable from WP2.2 provides a description of the preliminary framework and methodology defined to carry out the development of the security requirements. The framework includes aspects such as the identification of the ISITEP system components and players that are relevant for the security analysis, and the definition of security objectives. On this basis, the document also conducts a first assessment to delineate the state-of-the-art of the security features existing in current PPDR technologies and networks, security procedures carried out by PPDR end-users and operators in order to realise the trusted and secure communication system needed in national PPDR networks, and to provide an overview of the regulatory and legislation framework that impacts affects PPDR communication networks. Finally, a preliminary assessment of security threats to ISITEP system is also reported. The assessment is focused on those security threats that are relevant to the new communications capabilities brought by the ISITEP solution in terms of service interworking across multiple national networks and terminal roaming.

    Communications security is a central aspect of the ISITEP framework for inter-system interoperability between TETRA and TETRAPOL networks. Ensuring that threats to the interconnected communications systems and terminals are sufficiently and appropriately reduced by technical, procedural and environmental countermeasures is vital to realise the trusted and secure communication system needed for the pursued PPDR transnational cooperation activities. In this context, ISITEP Work Package 2.2 (WP2.2) “Security Requirements” is aimed at establishing the set of security requirements needed to drive the development of the security architecture and its components. This first deliverable from WP2.2 provides a description of the preliminary framework and methodology defined to carry out the development of the security requirements. The framework includes aspects such as the identification of the ISITEP system components and players that are relevant for the security analysis, and the definition of security objectives. On this basis, the document also conducts a first assessment to delineate the state-of-the-art of the security features existing in current PPDR technologies and networks, security procedures carried out by PPDR end-users and operators in order to realise the trusted and secure communication system needed in national PPDR networks, and to provide an overview of the regulatory and legislation framework that impacts affects PPDR communication networks. Finally, a preliminary assessment of security threats to ISITEP system is also reported. The assessment is focused on those security threats that are relevant to the new communications capabilities brought by the ISITEP solution in terms of service interworking across multiple national networks and terminal roaming.

    Entregable del projecte de recerca ISITEP

  • Contribution to Spectrum Management in Cognitive Radio Networks: A Cognitive Management Framework  Open access

     Bouali, Faouzi
    Defense's date: 2013-09-26
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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    A fin de subir la eficiencia de uso del espectro, el paradigma de la radio cognitiva (CR) ha ganado mucho interés para permitir un acceso dinámico al espectro (DSA). En esta línea, las redes radio cognitivas (CRNs) se han enriquecido de un soporte de gestión cognitiva para incitar su despliegue y comercialización. Esta tesis ha valorado la relevancia de explotar varias funcionalidades de gestión cognitiva en distintos escenarios y casos de estudio prácticos.Específicamente, esta tesis ha construido un marco genérico de gestión cognitiva, basado en el concepto de fittigness factor, para soportar la gestión de los recursos radio en las CRNs. En este marco, dos de las aplicaciones más interesantes de las CRs, a saber el acceso oportunista al espectro (OSA) de las bandas licenciadas y el reparto abierto de las bandas exentas de licencia. En lo que se refiere a la primera aplicación, se han propuesto y evaluado varias estrategias explotando la dependencia entre las duraciones de actividad e inactividad de los usuarios primarios para llevar a cabo una selección de espectro proactiva. También se han proporcionado una serie de directrices para escoger la estrategia más relevante para un cierto entorno. Con respecto a la segunda aplicación, se ha propuesto una estrategia de selección de espectro con el fin de proporcionar una utilización eficiente de las distintas bandas. Varias formulaciones del fittigness factor han sido propuestas y evaluadas y sus relevancias se han valorado para distintas configuraciones.Inspirándose en estas aplicaciones, se ha propuesto una estrategia proactiva más general para soportar de manera conjunta las funcionalidades de selección de espectro (SS) y movilidad de espectro (SM) a base de una caracterización de los recursos de espectro en ambos dominios temporal y espectral. Se han comparado varias variantes de la dicha estrategia, cada una combinando distintas alternativas y opciones de implementación, para identificar cuáles de sus componentes tiene el mayor impacto sobre el rendimiento según las condiciones operativas del CRN. La racionalidad de la metodología propuesta con respecto a otras estrategias ha sido evaluada gracias a un análisis coste-beneficio, confrontando la ganancia en términos del nivel de satisfacción de los usuarios con el coste resultante en términos de señalización.Finalmente, se han analizado los aspectos de practicidad en términos de robustez a la incertidumbre y aplicabilidad en entornos realistas. En lo que se refiere al primer aspecto, la robustez se ha evaluado frente a dos fuentes de incertidumbre, la imperfección del proceso de adquisición y la no estacionalidad del entorno, y se han propuesto funcionalidades de soporte para mejorar la robustez cuando sea necesario. En lo que concierne el segundo aspecto, el marco se ha aplicado al entorno hogar digital (DH) para valorar la validez de los resultados obtenidos bajo condiciones más realistas.

    To overcome the current under-utilization of spectrum resources, the CR (Cognitive Radio) paradigm has gained an increasing interest to perform the so-called Dynamic Spectrum Access (DSA). In this respect, Cognitive Radio networks (CRNs) have been strengthened with cognitive management support to push forward their deployment and commercialization. This dissertation has assessed the relevance of exploiting several cognitive management functionalities in various scenarios and case studies. Specifically, this dissertation has constructed a generic cognitive management framework, based on the fittingness factor concept, to support spectrum management in CRNs. Under this framework, the dissertation has addressed two of the most promising CR applications, namely an Opportunistic Spectrum Access (OSA) to licensed bands and open sharing of license-exempt bands. In the former application, several strategies that exploit temporal statistical dependence between primary activity/inactivity durations to perform a proactive spectrum selection have been discussed. A set of guidelines to select the most relevant strategy for a given environment have been provided. In the latter application, a fittingness factor-based spectrum selection strategy has been proposed to efficiency exploit the different bands. Several formulations of the fittingness factor have been compared, and their relevance have been assessed under different settings. Drawing inspiration from these applications, a more general proactive strategy exploiting a characterization of spectrum resources at both the time and frequency domains has been developed to jointly assist spectrum selection (SS) and spectrum mobility (SM) functionalities. Several variants of the proposed strategy, each combining different choices and options of implementation, have been compared to identify which of its components have the most significant impact on performance depending on the working conditions of the CRN. To assess rationality of the proposed strategy with respect to other strategies, a cost-benefit analysis has been conducted to confront the introduced gain in terms of user satisfaction level to the incurred cost in terms of signaling amount. Finally, the dissertation has conducted an analysis of practicality aspects in terms of robustness to environment uncertainty and applicability to realistic environments. With respect to the former aspect, robustness has been assessed in front of two sources of uncertainty, namely imperfection of the acquisition process and non-stationarity of the environment, and additional functionalities have been developed, when needed, to improve robustness. With respect to the latter, the proposed framework has been applied to a Digital Home (DH) environment to validate the obtained key findings under realistic conditions.

  • E-01205

     Sallent Roig, Jose Oriol
    Participation in a competitive project

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  • 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

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    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.

  • Cognitive control channels: from concept to identification of implementation options

     Stavroulaki, Vera; Tsagkaris, Kostas; Demestichas, Panagiotis; Gebert, Jens; Mueck, Markus; Schmidt, Andreas; Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Filo, Marcin; Mouton, Christian; Rakotoharison, Lanto
    IEEE communications magazine
    Date of publication: 2012-07
    Journal article

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    Recent effort related to cognitive radio systems has lead to an in-depth analysis of context information management and exploitation based on a cognitive control channel for enhancement of management needed for, say, suitable link selection in a heterogeneous radio framework, dynamic radio resource management, and distributed sensing. Concerning the actual implementation of such a CCC, the focus was recently moved toward an in-band solution, where the information is transported building on existing radio access technologies. In this scope, this article illustrates relevant technical scenarios in which CCCs can be exploited and outlines a set of derived system requirements. The article provides an overview of various possible RAT independent and dependent implementation options, such as Diameter, distributed agents, 3GPP radio resource control (RRC) mechanisms, IEEE 802.21, IEEE 802.11, WiMedia UWB, and Bluetooth. The advantages and drawbacks of the various options are discussed.

    Recent effort related to cognitive radio systems has lead to an in-depth analysis of context information management and exploitation based on a cognitive control channel for enhancement of management needed for, say, suitable link selection in a heterogeneous radio framework, dynamic radio resource management, and distributed sensing. Concerning the actual implementation of such a CCC, the focus was recently moved toward an in-band solution, where the information is transported building on existing radio access technologies. In this scope, this article illustrates relevant technical scenarios in which CCCs can be exploited and outlines a set of derived system requirements. The article provides an overview of various possible RAT independent and dependent implementation options, such as Diameter, distributed agents, 3GPP radio resource control(RRC) mechanisms, IEEE 802.21, IEEE 802.11, WiMedia UWB, and Bluetooth. The advantages and drawbacks of the various options are discussed.

  • Public safety communications: Enhancement through cognitive radio and spectrum sharing principles

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Baldini, Gianmarco; Goratti, Leonardo
    IEEE Vehicular technology magazine: connecting the Mobile world
    Date of publication: 2012
    Journal article

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    The evolution of public safety communications in Europe: the results from the FP7 HELP project  Open access

     Baldini, Gianmarco; Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Hirst, Paul; Delmas, Serge; Pisz, Rafal
    ETSI Workshop on Reconfigurable Radio Systems
    Presentation's date: 2012-12-12
    Presentation of work at congresses

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    This paper describes the results from the FP7 HELP project, which investigated the potential of emerging wireless communication technologies and potential synergies between mobile public safety and commercial networks to enhance the communication capabilities of public safety users. The paper identifies the current trends and challenges for wireless communications in the public safety domain, the potential solution frameworks identified in the HELP project and an economic analysis to show the benefits in terms of cost saving. The paper also describes the related research activities of the European Commission in this area.

    This paper describes the results from the FP7 HELP project, which investigated the potential of emerging wireless communication technologies and potential synergies between mobile public safety and commercial networks to enhance the communication capabilities of public safety users. The paper identifies the current trends and challenges for wireless communications in the public safety domain, the potential solution frameworks identified in the HELP project and an economic analysis to show the benefits in terms of cost saving. The paper also describes the related research activities of the European Commission in this area.

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    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

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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 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.

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    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

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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 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

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    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.

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    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
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    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
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    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
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    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.

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    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
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    Deliverable D5.2 del projecte OneFIT

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    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
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    Deliverable D4.3 del projecte OneFIT

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    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
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    Deliverable D5.3 del projecte OneFIT

    Postprint (author’s final draft)

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    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
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    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)

  • Performance evaluation of radio access selection strategies in constrained multi-access/multi-service wireless networks

     Gelabert Doran, Xavier; Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Agusti Comes, Ramon
    Computer networks
    Date of publication: 2011-01-07
    Journal article

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    The benefits of jointly managing the combined set of radio resources offered by heterogeneous networks consisting of several radio access technologies (RATs) have been profusely studied and assessed in recent years. This notion has been coined as common radio resource management (CRRM). Nevertheless, most of the existing work assumes scenarios where all RATs are accessible (provided the RAT is not at full capacity) to those users demanding a particular service. If this is so, the obtained benefits become rather optimistic given that we neglect the fact that the deployed RATs may have different coverage overlapping conditions among them and that users may not have terminals that support all RATs (i.e. multimode terminals). In this paper we extend a previously developed Markov framework in order to capture the effect of having different coverage overlapping conditions along with the capability of certain terminals to support all or a subset of available RATs. Probabilistic models are obtained for the characterization of a wide range of coverage and terminal heterogeneity scenarios. Extensive performance evaluation is carried out in order to identify those parameters influencing the suitability of a particular initial RAT selection strategy, that is, to choose the most suitable RAT at call/session initiation among those accessible. Results indicate that suitable RAT selection is tightly dependent on: the ratio between the different offered traffic loads (or service-mix), the contention (if any) for radio resources by different services in particular RATs, and the identification of access-constrained RATs due to lack of coverage and/or terminal capability. In this paper we provide specific guidelines and rules concerning resource allocation for the utmost utilization of radio resources, in terms of Erlang capacity, and enhanced perceived quality by the users, in terms of achievable throughput.

  • A roadmap from UMTS optimization to LTE self-optimization

     Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Sanchez Gonzalez, Juan; Agusti Comes, Ramon; Díaz Guerra, Miguel Angel; Henche, David; Paul, Daniel
    IEEE communications magazine
    Date of publication: 2011-06
    Journal article

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  • 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

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  • 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

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  • 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

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  • 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

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    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.

  • 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

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  • 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

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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, 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.

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    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

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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 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)

  • 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

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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 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.

  • 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

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  • Enhanced Communications in Emergencies by Creating and Exploiting Synergies in Composite Radio Systems

     Ferrús Ferré, Ramon; Agusti Comes, Ramon; Bouali, Faouzi; Sallent Roig, Jose Oriol
    Participation in a competitive project

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  • 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

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    Formulation, implementation considerations, and first performance evaluation of algorithmic solutions - D4.1  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; Kritikou, Yiouli; Thomatos, Evangelos; Bantouna, Aimilia; Akezidou, Maria; Koutsouris, Nikos; Fracchia, Roberta; Pega, Stéphane; Tosic, Milenko; Mustonen, Miia; Matinmikko, Marja; Lécroart, Benoit; Mouton, Christian; Rakotoharison, Lanto; Shariat, Shahin; Fuchs, Rolf; Gebert, Jens; Tsagkaris, Kostas; Tzifa, Lia; Sarli, Asimina; Bourdellès, Michel; Papadopoulou, Louisa-Magdalene; Sarvanko, Heli; Lee, Haeyoung
    Date: 2011-05
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    This deliverable contains a first version of the algorithmic solutions for enabling opportunistic networks. The presented algorithms cover the full range of identified management tasks: suitability, creation, QoS control, reconfiguration and forced terminations. Preliminary evaluations complement the proposed algorithms. Implementation considerations towards the practicality of the considered algorithms are also included.

    Deliverable D4.1 del projecte Europeu OneFIT (ICT-2009-257385)

  • Information definition for the integrated C4MS - M3.2

     Gebert, Jens; Filo, Marcin; Sroka, Milosz; Muck, Markus; Mouton, Christian; Vahid, Seiamak; Ferrús Ferré, Ramon; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Demestichas, Panagiotis; Georgakopoulos, Andreas; Karvounas, Dimitrios; Logothetis, Marios; Stavroulaki, Vera; Matinmikko, Marja; Mustonen, Miia; Tsagkaris, Kostas; Sarvanko, Heli; Schmidt, Andreas
    Date: 2011-06
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  • Interactions and synergies among diverse algorithmic solutions for enabling opportunistic networks - M4.2

     Sallent Roig, Jose Oriol; Pérez Romero, Jordi; Matinmikko, Marja; Mustonen, Miia; Karvounas, Dimitrios; Georgakopoulos, Andreas; Stavroulaki, Vera; Koutsouris, Nikos; Demestichas, Panagiotis; Tosic, Milenko; Boskovic, Dragan; Vahid, Seiamak; Shariat, Shahin; Fuchs, Rolf; Gebert, Jens; Bourdellès, Michel; Mouton, Christian; Lécroart, Benoit; Aparicio, María Teresa; Tsagkaris, Kostas; Sarvanko, Heli; Riaz, Maryam; Lee, Haeyoung; Moreno, Oscar
    Date: 2011-12
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  • D2.1 Description of operational user requirements and scenarios

     Hirst, Paul; Sallent Roig, Jose Oriol; Ferrús Ferré, Ramon; Baldini, Gianmarco; Pisz, Rafal
    Date: 2011-06-02
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  • D2.2 Definition of system requirements

     Baldini, Gianmarco; Delmas, Serge; Ferrús Ferré, Ramon; Goratti, Leonardo; Hirst, Paul; Pisz, Rafal; Sallent Roig, Jose Oriol; Sroka, Krystian
    Date: 2011-08-07
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  • D3.1 Analysis of network and spectrum sharing solutions

     Baldini, Gianmarco; Delmas, Serge; Ferrús Ferré, Ramon; Goratti, Leonardo; Pisz, Rafal; Sallent Roig, Jose Oriol; Sroka, Krystian; Stefanski, Szymon
    Date: 2011-09-09
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