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  • Hybrid sparse linear array synthesis applied to phased antenna arrays

     Yepes, Leonardo Fabio; Covarrubias, David; Alonso, Miguel A.; Ferrús Ferré, Ramon
    IEEE antennas and wireless propagation letters
    Vol. 13, p. 185-188
    DOI: 10.1109/LAWP.2014.2301012
    Date of publication: 2014-01-16
    Journal article

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    In this letter, a new hybrid technique to synthesize sparse linear arrays is proposed. This technique is based on the combination of two methods. As a first method, a deterministic synthesis algorithm is used to resolve the nonuniform amplitude excitations and the antenna element locations. Then, the second method is an iterative optimization scheme that computes the phase of the excitation currents. This approach is proven valid to properly match diverse beam patterns (narrow-beam, flat-top, and square-cosecant) with sparse linear arrays. Three numerical experiments are reported that show the performance of the proposed technique and compare it to other outstanding methods available in the literature.

    In this letter, a new hybrid technique to synthesize sparse linear arrays is proposed. This technique is based on the combination of two methods. As a first method, a deterministic synthesis algorithm is used to resolve the nonuniform amplitude excitations and the antenna element locations. Then, the second method is an iterative optimization scheme that computes the phase of the excitation currents. This approach is proven valid to properly match diverse beam patterns (narrow-beam, flat-top, and square-cosecant) with sparse linear arrays. Three numerical experiments are reported that show the performance of the proposed technique and compare it to other outstanding methods available in the literature.

  • Redes móviles eficientes para la ampliación de servicios a nuevos sectores profesionales

     Agusti Comes, Ramon; Casadevall Palacio, Fernando-jose; Umbert Juliana, Anna; Sanchez Gonzalez, Juan; Pérez Romero, Jordi; Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol
    Competitive project

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  • Analytical modeling and performance evaluation of cell selection algorithms for mobile networks with backhaul capacity constraints

     Olmos Bonafé, Juan José; Ferrús Ferré, Ramon; Galeana Zapien, Hiram
    IEEE transactions on wireless communications
    Vol. 51, num. 10, p. 154-161
    DOI: 10.1109/TWC.2013.101813.121228
    Date of publication: 2013-10-28
    Journal article

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    Mobile backhaul has moved to the forefront of wireless industry hot topics. The progressive deployment of spectrally efficient radio access technologies (e.g. HSPA, LTE, WiMAX) in mobile broadband is turning into stringent capacity requirements on the backhaul network. This makes backhaul capacity to become a potential network bottleneck in some deployment scenarios. While more cost-efficient transmission technologies are needed to increase the capacity of mobile backhaul, optimization solutions to get the most out of the backhaul capacity are also necessary. This paper analyses the possibility to exploit load balancing among base stations to improve backhaul capacity utilization. Load balancing is realized through cell selection algorithms accounting for both radio interface and backhaul conditions. An analytical model aimed at evaluating the performance of cell selection strategies for mobile networks with backhaul capacity constraints is developed. The analytical model is used to evaluate the performance of a novel backhaul-aware cell selection algorithm and compare it with classical schemes based exclusively on radio information. Obtained results show that the proposed algorithm can achieve a utilization of backhaul resources higher than the traditional cell selection schemes while providing the same radio interface performance. Analytical results have been verified by means of simulation.

    Wireless communications technologies play an essential role to support the Public Protection and Disaster Relief (PPDR) operational needs. 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 spectrumrelated 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.

  • LTE: the technology driver for future public safety communications

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Baldini, Gianmarco; Goratti, Leonardo
    IEEE communications magazine
    Vol. 51, num. 10, p. 154-161
    DOI: 10.1109/MCOM.2013.6619579
    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.

  • 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
    Vol. 8, num. 2, p. 28-36
    DOI: 10.1109/MVT.2013.2252273
    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.

  • 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

  • Inter System Interoperability for Tetra-TetraPol Networks

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol
    Competitive project

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  • Proposal and evaluation of channel assignment algorithms for wireless local area networks with opportunistic spectrum access capabilities.

     Novillo Parales, Francisco Vicente
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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    La creixent necessitat de connectivitat sense fils està impulsant l'adopció massiva de la tecnologia Wi-Fi basada en l'estàndard IEEE 802.11 i la proliferació d¿escenaris on es concentren una elevat nombre de punts d'accés (AP, per les seves sigles en anglès) en àrees d¿alta concentració d¿usuaris com zones residencials o d¿oficines. Es preveu que pel 2016, més de la meitat del tràfic d'Internet al món procedirà de connexions Wi-Fi. Aquest augment de desplegaments densos origina alts nivells d'interferència en les bandes sense llicència (i.i. bandes ISM) utilitzades per les xarses sense fils (WLANs, per les seves sigles en anglès), que poden resultar en una degradació impredictible en el rendiment de la xarxa i la falta d'equitat entre APs. Els mecanismes d'assignació de canal són l'eina central utilitzada avui dia per mitigar els problemes d'interferència en la banda ISM causats per APs veïns. Independentment de la capacitat d'aquests mecanismes per millorar el rendiment de les WLANs, la quantitat d'espectre disponible en bandes ISM per a ús de WLANs és un factor limitant en desplegaments densos. Així, l'explotació de porcions addicionals de bandes assignades a una aplicació o servei en particular, que estiguin sense utilitzar o desocupades en llocs i horaris específics pot millorar el rendiment de les WLANs. Aquest concepte d'ús de l'espectre conegut com a accés d'espectre oportunista (OSA, per les seves sigles en anglès) permet als usuaris secundaris compartir les mateixes freqüències usades pels usuaris primaris sempre que els serveis primaris no siguin pertorbats.Aquesta tesi estudia les possibilitats i beneficis derivats de la introducció de mecanismes OSA en el funcionament de les WLANs. La tesi proporciona dues contribucions principals.La primera contribució és el desenvolupament de la formulació i avaluació de la disponibilitat espacial d'un cert segment d'espectre dins d'ubicacions interiors en zones urbanes denses amb la finalitat de ser explotat per WLANs amb capacitats OSA. Per a això, les condicions d'interferència entre els usuaris primaris i secundaris han estat establertes, juntament amb models de propagació necessaris per representar les pèrdues en exteriors, interiors i d¿exteriors a interiors. Considerant un sistema primari amb cobertura per exteriors, s¿ha obtingut el percentatge de localitzacions interiors on els usuaris secundaris puguin reutilitzar la banda primària sense interferir amb el sistema primari.La segona contribució és la proposta, desenvolupament i avaluació d'algorismes d'assignació de canal que permeten a les WLANs operar en canals disponibles en ISM i en bandes d'espectre habilitades per OSA. A diferència dels esquemes clàssics, els algorismes proposats aborden dos aspectes distintius: la priorització de canals entre les bandes ISM i OSA, i l'heterogeneïtat de l'espectre en el APs. A tal efecte, s¿ha desenvolupat un model per descriure i representar els principals components que intervenen en un escenari WLAN habilitat amb OSA. El model permet determinar els canals primaris disponibles en els APs i definir les restriccions d'assignació de canal. La tesi ha formulat primer el problema d'assignació de canal per WLANs habilitades amb OSA com un problema de binary linear programming (BLP), del que s¿han obtingut solucions òptimes mitjançant algorismes de branch and bound (BB). Motivats per la necessitat de tenir algorismes computacionalment més eficients que el BB, s¿han proposat diversos algorismes centralitzats i distribuïts, englobant tècniques de simulated annealing (SA) i la construcció d'un mínimum spanning tree (MST) per reduir el nivell d'acoblament entre APs veïns. Els algorismes han estat avaluats sota diferents condicions de densitat de APs i disponibilitat d'espectre i comparats a la solució òptima així com a algorismes clàssics utilitzats en WLAN sense OSA.

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    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.

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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
    Report

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    Deliverable D4.3 del projecte OneFIT

  • 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

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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
    Report

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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
    Report

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    Deliverable D5.2 del projecte OneFIT

  • 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
    Vol. 50, num. 7, p. 96-108
    DOI: 10.1109/MCOM.2012.6231285
    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.

  • 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
    Vol. 50, num. 11, p. 132-141
    DOI: 10.1109/MCOM.2012.6353693
    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.

  • A taxonomy and survey of SCTP research

     Budzisz, Lukasz; Garcia, Johan; Brunstrom, Anna; Ferrús Ferré, Ramon
    ACM computing surveys
    Vol. 44, num. 4, p. 1-36
    DOI: 10.1145/2333112.2333113
    Date of publication: 2012-08
    Journal article

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    The Stream Control Transmission Protocol (SCTP) is a relatively recent general-purpose transport layer protocol for IP networks that has been introduced as a complement to the well-established TCP and UDP transport protocols. Although initially conceived for the transport of PSTN signaling messages over IP networks, the introduction of key features in SCTP, such as multihoming and multistreaming, has spurred considerable research interest surrounding SCTP and its applicability to different networking scenarios. This article aims to provide a detailed survey of one of these new features—multihoming—which, as it is shown, is the subject of evaluation in more than half of all published SCTP-related articles. To this end, the article first summarizes and organizes SCTP-related research conducted so far by developing a four-dimensional taxonomy reflecting the (1) protocol feature examined, (2) application area, (3) network environment, and (4) study approach. Over 430 SCTP-related publications have been analyzed and classified according to the proposed taxonomy. As a result, a clear perspective on this research area in the decade since the first protocol standardization in 2000 is given, covering both current and future research trends. On continuation, a detailed survey of the SCTP multihoming feature is provided, examining possible applications of multihoming, such as robustness, handover support, and loadsharing.

  • Channel assignment algorithms for OSA-Enabled WLANs exploiting prioritization and spectrum heterogeneity

     Novillo, Francisco; Ferrús Ferré, Ramon
    IEICE transactions on communications
    Vol. E95-B, num. 4, p. 1125-1134
    DOI: 10.1587/transcom.E95.B.1125
    Date of publication: 2012-04
    Journal article

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    Allowing WLANs to exploit opportunistic spectrum access (OSA) is a promising approach to alleviate spectrum congestion problems in overcrowded unlicensed ISM bands, especially in highly dense WLAN deployments. In this context, novel channel assignment mechanisms jointly considering available channels in both unlicensed ISM and OSA-enabled licensed bands are needed. Unlike classical schemes proposed for legacy WLANs, channel assignment mechanisms for OSA-enabled WLAN should face two distinguishing issues: channel prioritization and spectrum heterogeneity. The first refers to the fact that additional prioritization criteria other than interference conditions should be considered when choosing between ISM or licensed band channels. The second refers to the fact that channel availability might not be the same for all WLAN Access Points because of primary users' activity in the OSA-enabled bands. This paper firstly formulates the channel assignment problem for OSA-enabled WLANs as a Binary Linear Programming (BLP) problem. The resulting BLP problem is optimally solved by means of branch and bound algorithms and used as a benchmark to develop more computationally efficient heuristics. Upon such a basis, a novel channel assignment algorithm based on weighted graph coloring heuristics and able to exploit both channel prioritization and spectrum heterogeneity is proposed. The algorithm is evaluated under different conditions of AP density and primary band availability.

    Postprint (author’s final draft)

  • 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
    Vol. 7, num. 2, p. 54-61
    DOI: 10.1109/MVT.2012.2190180
    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
    p. 1-10
    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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    Deliverable D3.2 - Information definition and signalling flows  Open access

     Gebert, Jens; Wich, Andreas; Filo, Marcin; Sroka, Milosz; Wierzbowsi, Tomasz; 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: 2011-09
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    The purpose of this deliverable is to define information to be exchanged in OneFIT system based on algorithms for the management of pportunistic networks and to design message sequence charts describing the signalling flows for supporting the management of opportunistic network. To further elaborate on the information exchange, this eliverable will introduce a preliminary state machine as well as information exchange strategies as they are envisaged in the OneFIT project.

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    OneFIT functional and system architecture - D2.2  Open access

     Gebert, Jens; Lange, Christian; Wich, Andreas; Georgakopoulos, Andreas; Demestichas, Panagiotis; Stavroulaki, Vera; Akezidou, Maria; Logothetis, Marios; Thomatos, Evangelos; Koutsouris, Nikos; Kritikou, Yiouli; Bantouna, Aimilia; Visiedo, David; Martin, Oscar; Mueck, Markus; Mouton, Christian; Mustonen, Miia; Matinmikko, Marja; Filo, Marcin; Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Boskovic, Dragan; Tosic, Milenko; Bender, Paul; Tsagkaris, Kostas; Tzifa, Lia; Moreno, Oscar; Schmidt, Andreas
    Date: 2011-02-28
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    This document presents the OneFIT functional and system architecture for the management and control of infrastructure coordinated opportunistic networks (ONs). The most relevant building blocks "Cognitive management System for the Coordination of the Infrastructure" (CSCI) and the "Cognitive Management system for the Opportunistic Network" (CMON) are described.

    Deliverable D2.2 del projecte Europeu OneFIT (ICT-2009-257385)

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    Validation platform specification ¿ D5.1  Open access

     Gebert, Jens; Lange, Christian; Wich, Andreas; Georgakopoulos, Andreas; Demestichas, Panagiotis; Stavroulaki, Vera; Karvounas, Dimitrios; Akezidou, Maria; Logothetis, Marios; Thomatos, Evangelos; Koutsouris, Nikos; Kritikou, Yiouli; Bantouna, Aimilia; Moreno, Oscar; Visiedo, David; Martin, Oscar; Mueck, Markus; Nehring, Florian; Moser, Guenter; Mouton, Christian; Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Boskovic, Dragan; Tosic, Milenko; Ikovic, Ognjen; Tsagkaris, Kostas; Tzifa, Lia; Drewes, Christian
    Date: 2011-09-30
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    The present deliverable introduces the OneFIT Proof-of-Concept (PoC) Architecture which will be used as a basis for the validation platform development throughout the project. This PoC Architecture proposal is validated by identifying the roles of the various components in the framework of the OneFIT Scenarios as derived and detailed in WP2. The applied methodology ensures that all required features are appropriately considered. Furthermore, the hardware components available to the project are detailed which are the basis for the development of an integrated validation platform. Their role is highlighted by an instantiation step which maps the PoC Architecture components to the identified hardware components. Finally, a scenario instantiation is derived which illustrates the role of the various hardware components for the validation of selected OneFIT scenarios.

    Deliverable D5.1 del projecte Europeu OneFIT (ICT-2009-257385)

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    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
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    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).

  • 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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  • D4.2 Workshop#1 report

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Baldini, Gianmarco; El Shabrawy, Karim; Sroka, Krystian; Pisz, Rafal; Hirst, Paul
    Date: 2011-11-20
    Report

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    Proposal of C4MS and inherent technical challenges ¿ D3.1  Open access

     Gebert, Jens; Filo, Marcin; Sroka, Krystian; Muck, Markus; Schmidt, Andreas; Lécroart, Benoit; Mouton, Christian; Rakotoharison, Lanto; Vahid, Seiamak; Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Demestichas, Panagiotis; Georgakopoulos, Andreas; Koutsouris, Nikos; Stavroulaki, Vera; Matinmikko, Marja; Mustonen, Miia; Tsagkaris, Kostas; Sarvanko, Heli; Moreno, Oscar
    Date: 2011-03-31
    Report

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    The scope of OneFIT is on Opportunistic etworks and Cognitive Management Systems for Efficient Application Provision in the uture Internet. This document contains a proposal of Control Channels for Coordination of Cognitive Management Systems (C4MS) which enables delivery of guidance/assistance information from infrastructure towards the Opportunistic Networks and provides means for the management of Opportunistic Networks. This document defines first messages and elementary procedures for the C4MS as well as it identifies a preliminary set of information which is to be conveyed over C4MS. The document introduces also the inherent technical challenges related to the C4MS proposal.

    Deliverable D3.1 del projecte Europeu OneFIT (ICT-2009-257385)

  • D4.1 Dissemination plan

     Baldini, Gianmarco; Delmas, Serge; Hirst, Paul; Ferrús Ferré, Ramon; Pisz, Rafal; Sallent Roig, Jose Oriol
    Date: 2011-04-08
    Report

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  • D1.3 Interim progress report

     Baldini, Gianmarco; Delmas, Serge; Ferrús Ferré, Ramon; Hirst, Paul; Pisz, Rafal; Sallent Roig, Jose Oriol
    Date: 2011-10-07
    Report

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    D1.1 Project presentation  Open access

     Baldini, Gianmarco; Delmas, Serge; Ferrús Ferré, Ramon; Hirst, Paul; Sallent Roig, Jose Oriol; Pisz, Rafal
    Date: 2011-03-02
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    Deliverable D1.1 of Project PROJECT HELP (ENHANCED COMMUNICATIONS IN EMERGENCIES BY CREATING AND EXPLOITING SYNERGIES IN COMPOSITE RADIO SYSTEMS), FP7-SEC-2010-1, PROJECT NUMBER 261659

  • D3.2 System concept for enhanced communications in emergencies

     Baldini, Gianmarco; Delmas, Serge; El Shabrawy, Karim; Ferrús Ferré, Ramon; Goratti, Leonardo; Pisz, Rafal; Sallent Roig, Jose Oriol; Sroka, Krystian; Stefanski, Szymon
    Date: 2011-12-09
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  • D1.2 Project management guidelines

     Baldini, Gianmarco; Delmas, Serge; Hirst, Paul; Ferrús Ferré, Ramon; Pisz, Rafal; Sallent Roig, Jose Oriol
    Date: 2011-03-03
    Report

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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
    Report

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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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  • 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
    Competitive project

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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
    Competitive project

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  • Contribution to resource management in cellular acces networks with limited backhaul capacity

     Galeana Zapien, Hiram
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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  • Contribution to resource management in cellular access networks with limited backhaul capacity  Open access

     Galeana Zapien, Hiram
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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    La interfaz radio de los sistemas de comunicaciones móviles es normalmente considerada como la única limitación de capacidad en la red de acceso radio. Sin embargo, a medida que se van desplegando nuevas y más eficientes interfaces radio, y de que el tráfico de datos y multimedia va en aumento, existe la creciente preocupación de que la infraestructura de transporte (backhaul) de la red celular pueda convertirse en el cuello de botella en algunos escenarios. En este contexto, la tesis se centra en el desarrollo de técnicas de gestión de recursos que consideran de manera conjunta la gestión de recursos en la interfaz radio y el backhaul. Esto conduce a un nuevo paradigma donde los recursos del backhaul se consideran no sólo en la etapa de dimensionamiento, sino que además son incluidos en la problemática de gestión de recursos. Sobre esta base, el primer objetivo de la tesis consiste en evaluar los requerimientos de capacidad en las redes de acceso radio que usan IP como tecnología de transporte, de acuerdo a las recientes tendencias de la arquitectura de red. En particular, se analiza el impacto que tiene una solución de transporte basada en IP sobre la capacidad de transporte necesaria para satisfacer los requisitos de calidad de servicio en la red de acceso. La evaluación se realiza en el contexto de la red de acceso radio de UMTS, donde se proporciona una caracterización detallada de la interfaz Iub. El análisis de requerimientos de capacidad se lleva a cabo para dos diferentes escenarios: canales dedicados y canales de alta velocidad. Posteriormente, con el objetivo de aprovechar totalmente los recursos disponibles en el acceso radio y el backhaul, esta tesis propone un marco de gestión conjunta de recursos donde la idea principal consiste en incorporar las métricas de la red de transporte dentro del problema de gestión de recursos. A fin de evaluar los beneficios del marco de gestión de recursos propuesto, esta tesis se centra en la evaluación del problema de asignación de base, como estrategia para distribuir el tráfico entre las estaciones base en función de los niveles de carga tanto en la interfaz radio como en el backhaul. Este problema se analiza inicialmente considerando una red de acceso radio genérica, mediante la definición de un modelo analítico basado en cadenas de Markov. Dicho modelo permite calcular la ganancia de capacidad que puede alcanzar la estrategia de asignación de base propuesta. Posteriormente, el análisis de la estrategia propuesta se extiende considerando tecnologías específicas de acceso radio. En particular, en el contexto de redes WCDMA se desarrolla un algoritmo de asignación de base basado en simulatedannealing cuyo objetivo es maximizar una función de utilidad que refleja el grado de satisfacción de las asignaciones respecto los recursos radio y transporte. Finalmente, esta tesis aborda el diseño y evaluación de un algoritmo de asignación de base para los futuros sistemas de banda ancha basados en OFDMA. En este caso, el problema de asignación de base se modela como un problema de optimización mediante el uso de un marco de funciones de utilidad y funciones de coste de recursos. El problema planteado, que considera que existen restricciones de recursos tanto en la interfaz radio como en el backhaul, es mapeado a un problema de optimización conocido como Multiple-Choice Multidimensional Knapsack Problem (MMKP). Posteriormente, se desarrolla un algoritmo de asignación de base heurístico, el cual es evaluado y comparado con esquemas de asignación basados exclusivamente en criterios radio. El algoritmo concebido se basa en el uso de los multiplicadores de Lagrange y está diseñado para aprovechar de manera simultánea el balanceo de carga en la intefaz radio y el backhaul.

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    Cognitive control channels for the cooperation of opportunistic and composite wireless networks  Open access

     Gebert, Jens; Georgakopoulos, Andreas; Stavroulaki, Vera; Ferrús Ferré, Ramon; Demestichas, Panagiotis; Tsagkaris, Kostas
    European Signal Processing Conference
    p. 2289-2293
    Presentation's date: 2011-09-02
    Presentation of work at congresses

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    Opportunistic networks (ONs) are considered as coordinated extensions of a radio access network infrastructure, which are dynamically and temporarily created in an infrastructure-less manner in order to increase service reachability, improve resource utilization efficiency and facilitate localised service provisioning. The realization of the ON concept relies on the existence of control channels which will provide necessary signalling for the coordination of the ON nodes. Proposed control channels are conceived as an evolution of the already established cognitive pilot channel concept. As a result, new interfaces are discussed in order to convey information from the infrastructure to the terminals and vice versa or between terminals. Finally, the business benefits of the aforementioned approach are provided in order to strengthen the notion of the proposed control channels and consider future expansions.

  • Distributed channel assignment algorithm based on simulated annealing for uncoordinated OSA-enabled WLANs

     Novillo, Francisco; Ferrús Ferré, Ramon
    International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications
    p. 81-85
    Presentation's date: 2011-06-01
    Presentation of work at congresses

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    A promising approach to alleviate ISM band congestion problems in highly dense WLAN scenarios consists of exploiting opportunistic spectrum access (OSA) to underutilized bands under a primary-secondary model. This paper develops a distributed channel assignment algorithm valid for uncoordinated WLAN deployments where access points do not follow any specific planning and they could belong to different administrative domains. Unlike existing channel assignment schemes proposed for legacy WLANs, channel assignment mechanisms for OSA-enabled WLAN should address two distinguishing issues: channel prioritization and spectrum heterogeneity. Over such a basis, this paper develops and assesses the performance of a distributed channel assignment algorithm that is able to exploit both channel prioritization and spectrum heterogeneity concepts. In particular, the algorithm is based on a distributed adaptation of the simulated annealing metaheuristic algorithm commonly used in global optimization problems.

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    Control channels for the cooperation of cognitive management systems in opportunistic and composite wireless networks  Open access

     Stavroulaki, Vera; Georgakopoulos, Andreas; Demestichas, Panagiotis; Ferrús Ferré, Ramon; Filo, Marcin; Tsagkaris, Kostas
    Cognitive Radio and Networking for Cooperative Coexistence of Heterogeneous Wireless Networks
    p. 1-2
    Presentation's date: 2011-10-06
    Presentation of work at congresses

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    Opportunistic Networks (ONs) are assumed to be temporary, localized extensions of the infrastructure network that are created under certain circumstances. According to that vision, ONs are coordinated by the radio access network (RAN) operator which governs the overal system behaviour (e.g. ON related policies), provides the neccessary resources (e.g. dedicated specturm bands) and supports users in decision making (e.g. additional knowledge and context information). ONs comprise both nodes of the infrastructure and infrastructure-less devices. For the management and control of operator-governed ONs the introduction of Cognitive Management Systems (CMSs), localized on the terminal and infrastructure side, is proposed. The cooperation of CMS entities will require existence of well-defined control channels. In order to enable the necessary signalling between the CMS entities, Control Channels for the Cooperation of the Cognitive Management Systems (C4 MS) are proposed.

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    Business scenarios, technical challenges and system requirements - D2.1  Open access

     Visiedo, David; Urdiales, Diego; Santiago, Miquel Angel; Gebert, Jens; Lange, Christian; Wich, Andreas; Agusti Comes, Ramon; Ferrús Ferré, Ramon; Pérez Romero, Jordi; Sallent Roig, Jose Oriol; Mustonen, Miia; Matinmikko, Marja; Demestichas, Panagiotis; Stavroulaki, Vera; Akezidou, Maria; Logothetis, Marios; Georgakopoulos, Andreas; Thomatos, Evangelos; Koutsouris, Nikos; Kritikou, Yiouli; Bantouna, Aimilia; Filo, Marcin; Piesiewicz, Radoslaw; Boskovic, Dragan; Tosic, Milenko; Pecelj, Ilija; Schmmidt, Andreas; Muck, Markus; Mouton, Christian; Merat, Vincent; Bender, Paul; Tsagkaris, Kostas; Tzifa, Lia; Moreno, Oscar
    Date: 2010-11
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    Deliverable D2.1 del projecte Europeu OneFIT (ICT-2009-257385)

  • Opportunistic networks and Cognitive Management Systems for Efficient Application Provision in the Future

     Sanchez Gonzalez, Juan; Umbert Juliana, Anna; Gelonch Bosch, Antoni; Ferrús Ferré, Ramon; Pérez Romero, Jordi; Casadevall Palacio, Fernando-jose; Agusti Comes, Ramon; Raschella, Alessandro; Bouali, Faouzi; Sallent Roig, Jose Oriol
    Competitive project

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  • FLEXIBLE AND SPECTRUM-AWARE RADIO ACCESS THROUGH MEASUREMENTS AND MODELLING IN

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Bouali, Faouzi; Bolea, Liliana; Pérez Romero, Jordi; Raschella, Alessandro; López Benítez, Miguel; Garcia Escriche, Sergio; Umbert Juliana, Anna; Casadevall Palacio, Fernando-jose; Agusti Comes, Ramon
    Competitive project

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  • Design and Evaluation of a Backhaul-Aware Base Station Assignment Algorithm for OFDMA-Based Cellular Networks

     Galeana Zapién, Hiram; Ferrús Ferré, Ramon
    IEEE transactions on wireless communications
    Vol. 9, num. 10, p. 3226-3237
    DOI: 10.1109/TWC.2010.082110.091735
    Date of publication: 2010-10
    Journal article

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    Interworking in heterogeneous wireless networks: comprehensive framework and future trends  Open access

     Ferrús Ferré, Ramon; Sallent Roig, Jose Oriol; Agusti Comes, Ramon
    IEEE Wireless communications
    Vol. 17, num. 2, p. 22-31
    DOI: 10.1109/MWC.2010.5450657
    Date of publication: 2010-04
    Journal article

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    Interworking mechanisms are of prime importance to achieve ubiquitous access and seamless mobility in heterogeneous wireless networks. In this article we develop a comprehensive framework to categorize interworking solutions by defining a generic set of interworking levels and its related key interworking mechanisms. The proposed framework is used to analyze some of the most relevant interworking solutions being considered in different standardization bodies. More specifically, I-WLAN and GAN approaches for WLAN and cellular integration, solutions for WiMAX and 3GPP LTE/SAE interworking, and the forthcoming IEEE 802.21 standard are discussed from the common point of view provided by the elaborated framework.

  • LTE: nuevas tendencias en comunicaciones móviles

     Agusti Comes, Ramon; Bernardo Alvarez, Francisco; Casadevall Palacio, Fernando-jose; Ferrús Ferré, Ramon; Pérez Romero, Jordi; Sallent Roig, Jose Oriol
    Date of publication: 2010
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    Enhanced base station assignment approach for coping with backhaul constraints in OFDMA-based cellular networks  Open access

     Galeana Zapién, Hiram; Ferrús Ferré, Ramon
    European Wireless Conference
    p. 254-260
    DOI: doi: 10.1109/EW.2010.5483425
    Presentation's date: 2010-04
    Presentation of work at congresses

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    In this paper we extend the base station (BS) assignment problem to incorporate backhaul related constraints into the assignment decision. This is motivated by the fact that the deployment of more spectral efficient radio access technologies are currently imposing stringent bandwidth requirements at cell sites, and there is a growing concern that backhaul network can become a new network bottleneck in certain deployment scenarios. Unlike existing assignment approaches, we propose a BS assignment algorithm envisioned as a suitable technique capable to cope, at some extent, with possible backhaul congestion situations in OFDMA-based systems. Simulation results demonstrate that the proposed algorithm can provide the same system capacity with less backhaul resources so that, under backhaul bottleneck situations, a better overall network performance is effectively achieved.

  • Opportunistic channel allocation algorithms for WLANs based on IEEE802.11

     Novillo, Fernando; Ferrús Ferré, Ramon; Agusti Comes, Ramon; Nasreddine, Jad Nayef
    Future Network and MobileSummit
    Presentation's date: 2010-06-18
    Presentation of work at congresses

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    The deployment of highly dense wireless local area networks (WLAN) can cause an excessive level of interference in the commonly used 2.4 GHz ISM band, which leads to network performance degradation. This paper analyses the possibility to reduce congestion in the crowded ISM band by allowing some access points (APs) to opportunistically operate in a primary band. Although the problem of opportunistic channel allocation considering both ISM and primary bands can be formulated mathematically as a Binary Linear Programming (BLP) problem, existing algorithms (e.g., branch and bound) capable to provide optimal solutions for BLP problems are quite inefficient for large deployments. Therefore, we propose three different heuristic algorithms to solve this opportunistic channel allocation problem by properly extending graph coloring algorithms: First Fit (FF), Saturation Degree Ordering (SDO) and Minimum Spanning Tree (MST). A performance analysis of the three algorithms is carried out under different conditions of primary band availability and AP density