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1 to 14 of 14 results
  • 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.

  • 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.

  • 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.

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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.

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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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    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 analysis of satellite-HSDPA transmissions in emergency networks  Open access

     Raschella, Alessandro; Araniti, Giuseppe; Umbert Juliana, Anna; Iera, Antonio; Molinaro, Antonella
    International ICST Conference on Personal Satellite Services
    Presentation's date: 2011-02-17
    Presentation of work at congresses

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    In this work we are interested to investigate how the Geostationary (GEO) satellite can be used to employ efficiently High Speed Downlink Packet Access (HSDPA) technology supporting Multimedia Broadcast/Multicast Service (MBMS) in a scenario in which the terrestrial network is not available. An exhaustive simulation campaign has been carried out with the aim to determinate the Satellite-HSDPA (S-HSDPA) performances in different radio channel conditions. In particular, a Good/Bad Channel model has been taken into account to achieve a specific radio information and to be able to evaluate the maximum date rate that can be obtained by S-HSDPA.

  • 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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    On the optimization of power assignment to support multicast applications in HAP-based systems  Open access

     Araniti, Giuseppe; Iera, Antonio; Molinaro, Antonella; Raschella, Alessandro; Umbert Juliana, Anna
    International Conference on Telecommunications
    Presentation's date: 2010-04
    Presentation of work at congresses

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    The goal of this research work is to investigate how efficient High Altitude Platforms (HAPs) can be in supporting Multimedia Broadcast/Multicast Service (MBMS) in scenarios in which the terrestrial coverage is not available. Specifically, we propose to implement an effective Radio Resources Management (RRM) policy into the HAP Radio Network Controller (H-RNC), whose main aim is to increase the overall system capacity. The proposed technique achieves its goal by dynamically selecting the most efficient multicast transport channel in terms of power consumption, chosen amongst Dedicated Channel (DCH), Forward Access Channel (FACH), and High Speed Downlink Shared Channel (HS-DSCH). Advantages deriving from the joint use of channels belonging to different categories are exploited. Results achieved when using the proposed RRM are quite manifest and witnesses to the necessity of providing such a feature when deploying integrated HAP/Terrestrial platforms supporting MBMS services.

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

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

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

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

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    On the impact of the user terminal velocity on HSPA performance in MBMS multicast mode  Open access

     Raschella, Alessandro; Umbert Juliana, Anna; Araniti, Giuseppe; Iera, Antonio; Molinaro, Antoniella
    International Conference on Telecommunications
    Presentation's date: 2009
    Presentation of work at congresses

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    Multimedia Broadcast/Multicast Services (MBMS), introduced in Universal Mobile Telecommunication System (UMTS), have the aim to allow transmissions from a single source entity to multiple destinations. From the radio perspective, MBMS foresees both pointto- point (PtP) and point-to-multipoint (PtM) transmission mode, supported by Dedicated, Common, and Shared channels. The High Speed Downlink Packet Access (HSDPA), analyzed in this paper, can guarantee a higher data rate through the introduction of High Speed Downlink Shared Channel (HS-DSCH), thus improving the performance of MBMS transmissions. The aim of this paper is to investigate the impact of the User Equipment (UE) speed on the maximum number of users that the HS-DSCH can support for MBMS applications. In particular, two different mobility profiles are taken into account (Pedestrian and Vehicular) and the obtained results are validated by considering different transmission power levels, cell coverage sizes and bit rates.

  • SINR-based Transport Channel Selection for MBMS Applications

     Raschella, Alessandro; Umbert Juliana, Anna; Giuseppe, Araniti; Antonio, Iera; Antonella, Molinaro
    IEEE Vehicular Technology Conference
    Presentation of work at congresses

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