Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 133 results
  • Performance evaluation and compartive analysis of subcarrier modulation Wake-up radio systems for energy-efficient Wireless Sensor Networks

     Oller Bosch, Joaquim; Demirkol, Ilker Seyfettin; Casademont Serra, Jordi; Paradells Aspas, Jose; Gamm, Gerd Ulrich; Reindl, Leonhard Michael
    Sensors
    Date of publication: 2014-01
    Journal article

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

    Energy-efficient communication is one of the main concerns of wireless sensor networks nowadays. A commonly employed approach for achieving energy efficiency has been the use of duty-cycled operation of the radio, where the node¿s transceiver is turned off and on regularly, listening to the radio channel for possible incoming communication during its on-state. Nonetheless, such a paradigm performs poorly for scenarios of low or bursty traffic because of unnecessary activations of the radio transceiver. As an alternative technology, Wake-up Radio (WuR) systems present a promising energy-efficient network operation, where target devices are only activated in an on-demand fashion by means of a special radio signal and a WuR receiver. In this paper, we analyze a novel wake-up radio approach that integrates both data communication and wake-up functionalities into one platform, providing a reconfigurable radio operation. Through physical experiments, we characterize the delay, current consumption and overall operational range performance of this approach under different transmit power levels. We also present an actual single-hop WuR application scenario, as well as demonstrate the first true multi-hop capabilities of a WuR platform and simulate its performance in a multi-hop scenario. Finally, by thorough qualitative comparisons to the most relevant WuR proposals in the literature, we state that the proposed WuR system stands out as a strong candidate for any application requiring energy-efficient wireless sensor node communications.

  • Wake-up radio as an energy-efficient alternative to conventional wireless sensor networks MAC protocols

     Oller Bosch, Joaquim; Demirkol, Ilker Seyfettin; Casademont Serra, Jordi; Paradells Aspas, Jose; Gamm, Gerd Ulrich; Reindl, Leonhard
    ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems
    Presentation's date: 2013-11
    Presentation of work at congresses

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

    The use of duty-cycling in Medium Access Control (MAC) protocols effectively helps improving the energy efficiency of wireless networks. However, while the benefits of these protocols are unquestionable, most of them still suffer from overhearing and idle listening, two issues that prevent duty-cycled systems from achieving optimum energy usage, which is a crucial aspect in specific types of wireless networks such as Wireless Sensor Networks (WSN).Wake-up Radio (WuR) systems have been employed recently to overcome these issues. Under this approach, the nodes' MicroController Unit (MCU) and main radio transceiver are completely switched off and only activated when a secondary, extremely low-power receiver in the node is triggered by a particular wireless transmission. Wake-up Radio systems allow for drastic energy savings since receiver nodes are only activated on-demand, maximizing their battery lifetimes. In this paper, we have modeled and simulated a real, recent and promising WuR hardware platform based on its time and energy consumption characterization. By comparing such WuR approach to B-MAC and IEEE 802.15.4, two well-known and widely employed MAC protocols, we show it effectively out-performs the conventional WSN MAC approaches in terms of energy efficiency. To the best of authors' knowledge, this is the first study to include a comparative analysis for multi-hop networks based on a real WuR platform, which shows WuR systems represent an energy-efficient solution that also provides a good tradeoff between latency, packet delivery ratio and applicability..

    The use of duty-cycling in Medium Access Control (MAC) protocols effectively helps improving the energy efficiency of wireless networks. However, while the benefits of these protocols are unquestionable, most of them still suffer from overhearing and idle listening, two issues that prevent duty-cycled systems from achieving optimum energy usage, which is a crucial aspect in specific types of wireless networks such as Wireless Sensor Networks (WSN).Wake-up Radio (WuR) systems have been employed recently to overcome these issues. Under this approach, the nodes' MicroController Unit (MCU) and main radio transceiver are completely switched off and only activated when a secondary, extremely low-power receiver in the node is triggered by a particular wireless transmission. Wake-up Radio systems allow for drastic energy savings since receiver nodes are only activated on-demand, maximizing their battery lifetimes. In this paper, we have modeled and simulated a real, recent and promising WuR hardware platform based on its time and energy consumption characterization. By comparing such WuR approach to B-MAC and IEEE 802.15.4, two well-known and widely employed MAC protocols, we show it effectively out-performs the conventional WSN MAC approaches in terms of energy efficiency. To the best of authors' knowledge, this is the first study to include a comparative analysis for multi-hop networks based on a real WuR platform, which shows WuR systems represent an energy-efficient solution that also provides a good tradeoff between latency, packet delivery ratio and applicability..

  • Access to the full text
    Energy efficient wireless networking of sensor nodes  Open access

     Demirkol, Ilker Seyfettin; Paradells Aspas, Jose; Oller Bosch, Joaquim; Casademont Serra, Jordi; Calveras Auge, Ana M.; Catalan Cid, Maria Luisa
    International Conference on Sensors and Measurement Technology
    Presentation's date: 2013-05
    Presentation of work at congresses

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

    Wireless sensor networks have paved the way to a new era in user applications, where information can be sensed, processed, and distributed from remote environments with minimal or no human interaction. As the sensor nodes in these networks are often battery-operated and communicate wirelessly, they are constrained by limited resources such as bandwidth, processing speed and especially by energy. Therefore, depending on the user application, different challenges are encountered for the realization of wireless sensor networks. In this paper, we will present several reallife applications along with the challenges encountered and benefits provided by the networking of the sensors for these applications.

    Wireless sensor networks have paved the way to a new era in user applications, where information can be sensed, processed, and distributed from remote environments with minimal or no human interaction. As the sensor nodes in these networks are often battery-operated and communicate wirelessly, they are constrained by limited resources such as bandwidth, processing speed and especially by energy. Therefore, depending on the user application, different challenges are encountered for the realization of wireless sensor networks. In this paper, we will present several reallife applications along with the challenges encountered and benefits provided by the networking of the sensors for these applications.

  • Atomic Services-based Internet Architecture for Constrained and Ubiquitous Networks (ASIACUN)

     Gomez Montenegro, Carlos; Calveras Auge, Ana M.; Paradells Aspas, Jose; Casademont Serra, Jordi; Lopez Aguilera, Maria Elena; Garcia Villegas, Eduard; Vidal Ferre, Rafael; Demirkol, Ilker Seyfettin; Casals Ibañez, Lluis; Ruiz, Pedro M.; Cotrina Navau, Josep; Oller Bosch, Joaquim; Gorricho Moreno, Juan Luis; BETZLER, AUGUST
    Participation in a competitive project

     Share

  • Design, development and performance evaluation of a low-cost, Low-power wake-up radio system for WSN

     Oller Bosch, Joaquim; Demirkol, Ilker Seyfettin; Casademont Serra, Jordi; Paradells Aspas, Jose
    ACM Transactions on Sensor Networks
    Date of publication: 2013-11-01
    Journal article

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

    Energy-efficient operation is a challenge for wireless sensor networks (WSNs). A common method employed for this purpose is duty-cycled operation, which extends battery lifetime yet incurs several types of energy wastes and challenges. A promising alternative to duty-cycled operation is the use of wake-up radio (WuR), where the main microcontroller unit (MCU) and transceiver, that is, the two most energy-consuming elements, are kept in energy-saving mode until a special signal from another node is received by an attached, secondary, ultra-low power receiver. Next, this so-called wake-up receiver generates an interrupt to activate the receiver node's MCU and, consequently, the main radio. This article presents a complete wake-up radio design that targets simplicity in design for the monetary cost and flexibility concerns, along with a good operation range and very low power consumption. Both the transmitter (WuTx) and the receiver (WuRx) designs are presented with the accompanying physical experiments for several design alternatives. Detailed analysis of the end system is provided in terms of both operational distance (more than 10 m) and current consumption (less than 1 µA). As a reference, a commercial WuR system is analyzed and compared to the presented system by expressing the trade-offs and advantages of both systems. © 2013 ACM.

    Energy-efficient operation is a challenge for wireless sensor networks (WSNs). A common method employed for this purpose is duty-cycled operation, which extends battery lifetime yet incurs several types of energy wastes and challenges. A promising alternative to duty-cycled operation is the use of wake-up radio (WuR), where the main microcontroller unit (MCU) and transceiver, that is, the two most energy-consuming elements, are kept in energy-saving mode until a special signal from another node is received by an attached, secondary, ultra-low power receiver. Next, this so-called wake-up receiver generates an interrupt to activate the receiver node's MCU and, consequently, the main radio. This article presents a complete wake-up radio design that targets simplicity in design for the monetary cost and flexibility concerns, along with a good operation range and very low power consumption. Both the transmitter (WuTx) and the receiver (WuRx) designs are presented with the accompanying physical experiments for several design alternatives. Detailed analysis of the end system is provided in terms of both operational distance (more than 10 m) and current consumption (less than 1 µA). As a reference, a commercial WuR system is analyzed and compared to the presented system by expressing the trade-offs and advantages of both systems. © 2013 ACM.

  • Time-Knocking: a novel addressing mechanism for wake-up receivers

     Oller Bosch, Joaquim; Demirkol, Ilker Seyfettin; Paradells Aspas, Jose; Casademont Serra, Jordi; Heinzelman, Wendi
    IEEE International Conference on Wireless and Mobile Computing, Networking and Communications
    Presentation's date: 2012-10
    Presentation of work at congresses

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

    Wake-up radios present a promising alternative to traditional duty-cycle approaches, by reducing overhearing and by eliminating idle listening completely. However, energy-efficient operation of the wake-up mechanism is required for the success of such systems. In particular, addressing is an important component of the wake-up procedure that can consume a significant portion of the energy required. Hence, in this paper we propose a novel energy-efficient scheme for addressing. The proposed method is called Time-Knocking (TicK), since it utilizes the time duration of the MicroController Unit (MCU) sleeping to encode an address. In this paper, it is shown through mathematical analysis that TicK is much more energy efficient compared to the two common addressing mechanisms: MCU-decoding and correlator-based addressing. For realistic performance evaluations, physical measurements are performed to extract the parameter values of each method or the parameter values from well-documented off-the-shelf devices are used. TicK enables significant energy savings, especially in environments where false addressing initiations are frequent due to interference or where multiple nodes are addressed frequently.

  • Optimizing the delivery chain in heterogenous networks

     Sánchez Loro, Xavier; Paradells Aspas, Jose; Casademont Serra, Jordi; Ferrer Riera, José Luís
    Date of publication: 2011
    Book chapter

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

    Herein, we will focus on proposing a service taxonomy and classification for RBA/SOA architectures aiming to model a common framework for the description and composition of possible Atomic Ser- vices or networking functions valid for architectures coping with het- erogenous environments. The final objective is fine-tuning the delivery chain to optimize application and delivery performance and behaviour in heterogenous networks. Although our work takes the TARIFA architec- ture as the basis model for our contribution, we think it can be helpful for other architectures dealing with protocol modularization and service composition

  • Can Future Internet be based on constrained networks design principles?

     Sánchez Loro, Xavier; Ferrer Riera, José Luís; Gomez Montenegro, Carlos; Casademont Serra, Jordi; Paradells Aspas, Jose
    Computer networks
    Date of publication: 2011-03-10
    Journal article

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

  • Context-Aware Negotiation: the Basis for Ubiquitous Service Provisioning

     Sánchez Loro, Xavier
    Defense's date: 2011-12-15
    Department of Telematics Engineering, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Forwarding techniques for IP fragmented packets in a real 6LoWPAN network  Open access

     Ludovici, Alessandro; Calveras Auge, Ana M.; Casademont Serra, Jordi
    Sensors
    Date of publication: 2011-01-18
    Journal article

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

    Wireless Sensor Networks (WSNs) are attracting more and more interest since they offer a low-cost solution to the problem of providing a means to deploy large sensor networks in a number of application domains. We believe that a crucial aspect to facilitate WSN diffusion is to make them interoperable with external IP networks. This can be achieved by using the 6LoWPAN protocol stack. 6LoWPAN enables the transmission of IPv6 packets over WSNs based on the IEEE 802.15.4 standard. IPv6 packet size is considerably larger than that of IEEE 802.15.4 data frame. To overcome this problem, 6LoWPAN introduces an adaptation layer between the network and data link layers, allowing IPv6 packets to be adapted to the lower layer constraints. This adaptation layer provides fragmentation and header compression of IP packets. Furthermore, it also can be involved in routing decisions. Depending on which layer is responsible for routing decisions, 6LoWPAN divides routing in two categories: mesh under if the layer concerned is the adaptation layer and route over if it is the network layer. In this paper we analyze different routing solutions (route over, mesh under and enhanced route over) focusing on how they forward fragments. We evaluate their performance in terms of latency and energy consumption when transmitting IP fragmented packets. All the tests have been performed in a real 6LoWPAN implementation. After consideration of the main problems in forwarding of mesh frames in WSN, we propose and analyze a new alternative scheme based on mesh under, which we call controlled mesh under.

  • Propagation delay influence in IEEE 802.11 outdoor networks

     Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Cotrina Navau, Josep
    Wireless networks
    Date of publication: 2010-05
    Journal article

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

  • A PROXY-BASED SYSTEM FOR DYNAMIC CONTENT NEGOTIATION AND COLLABORATIVE OPTIMIZATION IN HETEROGENIC ENVIRONMENTS

     Sánchez Loro, Xavier; Beltran Martinez, Maria Victoria; Casademont Serra, Jordi; Catalan Cid, Maria Luisa
    Intelligent automation and soft computing
    Date of publication: 2010
    Journal article

     Share Reference managers Reference managers Open in new window

  • A study on the influence of transmission errors on WLAN 802.11 MAC performance

     Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Garcia Villegas, Eduard
    Wireless communications and mobile computing
    Date of publication: 2010
    Journal article

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

    Since the advent of the first IEEE 802.11 standard for WLANs, several papers have been presented that evaluate the IEEE 802.11 DCF access method. In realistic WLAN environments frame errors usually occur due to non-ideal channel conditions; in this way, papers including adverse transmission conditions in the evaluation have been published later in the literature. In this paper, we review existent analytical models that include the influence of transmission errors in IEEE 802.11 DCF performance. We modify current models and provide a more accurate analysis, thus allowing the evaluation in single rate and multi-rate scenarios with stations subject to different link error conditions. Moreover, this paper exposes the unfairness problem that arises in IEEE 802.11 DCF networks with stations subject to different transmission conditions through analytical and simulation results. Stations are not able to distinguish collisions from failed transmissions due to link errors; both result in a missing ACK and, consequently, the transmitting stations apply the exponential backoff algorithm. This fact leads to a lower performance for stations in worse transmission conditions. Copyright © 2010 JohnWiley & Sons, Ltd.

  • Redes de comunicaciones: de la telefonía móvil a Internet

     Beltran Sanchidrian, Victòria; Calveras Auge, Ana M.; Casademont Serra, Jordi; Casals Ibañez, Lluis; Catalan Cid, Maria Luisa; Catalan Cid, Miguel; Garcia Villegas, Eduard; Gomez Montenegro, Carlos; Hesselbach Serra, Xavier; Lopez Aguilera, Maria Elena; Paradells Aspas, Jose; Sánchez Loro, Xavier; Vidal Ferre, Rafael
    Date of publication: 2010-12-01
    Book

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Detecting and mitigating the impact of wideband jammers in IEEE 802.11 WLANs  Open access

     Garcia Villegas, Eduard; Gómez, Moisés; Lopez Aguilera, Maria Elena; Casademont Serra, Jordi
    International Wireless Communications and Mobile Computing Conference
    Presentation of work at congresses

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

    IEEE 802.11 Wireless LANs (WLANs) are highly sensitive to Denial of Service (DoS) attacks carried out with jamming devices. In this paper we focus on 2.4GHz wideband constant jammers. The interest in the wideband jammer lies in the fact that it beats all possible channels at the same time, leaving no possible escape following traditional channel-switching defenses. After studying and developing an effective detection mechanism, we propose the implementation of a load balancing technique based on cell breathing for mitigating the harmful effects of the jammer over an IEEE 802.11 WLAN. Cell breathing is achieved by dynamically tuning the transmission power to adjust the size of a WLAN cell.

  • NUEVAS ARQUITECTURAS PARA INTERNET UBICUA: DISEÑO Y EVALUACION

     Garcia Villegas, Eduard; Paradells Aspas, Jose; Cotrina Navau, Josep; Vidal Ferre, Rafael; Gomez Montenegro, Carlos; Lopez Aguilera, Maria Elena; Casals Ibañez, Lluis; Casademont Serra, Jordi; Calveras Auge, Ana M.
    Participation in a competitive project

     Share

  • Context Acquisition and Provisioning: Dynamic Content Negotiation in Web Environments.

     Casademont Serra, Jordi; Paradells Aspas, Jose; Sanchez-Loro, X; Ferrer, J L; Beltran Querol, Vicenç; Catalán, M
    Date of publication: 2009-03
    Book chapter

     Share Reference managers Reference managers Open in new window

  • Dynamic content negotiation in web environments

     Sánchez Loro, Xavier; Casademont Serra, Jordi; Ferrer Riera, José Luís; Beltran Sanchidrian, Victòria; Catalan Cid, Maria Luisa; Paradells Aspas, Jose
    Date of publication: 2009
    Book chapter

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

  • Access to the full text
    Rate adaptation in 3GPP video streaming using track switching over a multihop WLAN  Open access

     Catalán, Eliseo; Casademont Serra, Jordi; Ferrer Riera, José Luís; Sánchez Loro, Xavier
    IEEE Symposium on Computers and Communications
    Presentation's date: 2009-07
    Presentation of work at congresses

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

    In nowadays communication technologies, one of the main challenges to overcome is how to translate theoretical algorithms, designed protocols, existing hardware products from different manufacturers and the already knowhow into innovative applications that can produce a benefit for the user and for the commercializing firm. Following this topic, the present paper introduces an application that combines different emerging technologies: wireless mesh networks, multihop routing and adaptation of streaming delivery with the objective to create a tool for effective marketing campaigns

  • Access to the full text
    Impacto de mecanismos de seguridad en sensores IEEE 802.15.4  Open access

     Tripp Barba, Carolina; Casademont Serra, Jordi
    Jornadas de Ingeniería Telemática
    Presentation's date: 2009-09-16
    Presentation of work at congresses

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

    En la actualidad son muchos los mecanismos de seguridad que el estándar IEEE 802.15.4 permite a las redes inalámbricas de sensores [1] Dicho estándar define las especificaciones de la Capa de Acceso al Medio y la Capa Física de los dispositivos inalámbricos de área personal. La última revisión corresponde al 2006. Dichas revisiones y actualizaciones son hechas por el grupo de trabajo 802.15. Sin embargo estos mecanismos consumen recursos como memoria y batería, que son un poco limitados en estos dispositivos. Además de contribuir a los retardos en la comunicación. Por lo cual, en el presente trabajo se presenta de manera práctica el impacto que el uso de mecanismos de seguridad tienen en el desempeño de este tipo de redes. Para ello se hizo una comparación de dicho desempeño de manera teórica basándose en lo presentado en [2], con los valores óptimos apegados a lo especificado en el estándar IEEE 802.15.4, en contraste con pruebas reales. Para estas pruebas se hizo uso del sistema operativo TinyOS [3] y de las operaciones de seguridad MAC (Capa de Acceso al Medio) ofrecidas por el chip CC2420 usado en las motas TelosB. Además se presenta el desgaste de la batería, el cual es otro punto importante que se desea conservar en los sensores.

  • Access to the full text
    Proposal of a clean slate network architecture for ubiquitous services provisioning  Open access

     Sánchez Loro, Xavier; Casademont Serra, Jordi; Paradells Aspas, Jose; Ferrer Riera, José Luís; Vidal, Albert
    International Conference on Future Information Networks
    Presentation's date: 2009-10-15
    Presentation of work at congresses

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

    The Pervasive Computing field is almost always addressed from application, middleware, sensing or Human Computer Interaction perspective. Thus, solutions are usually designed at application level or involve developing new hardware. Although current layered network architectures (mainly TCP/IP stack) have enabled internetworking of lots of different devices and services, they are neither well-suited nor optimized for pervasive computing applications. Hence, we firmly believe that we should have an underlying network architecture providing the flexible, context-aware and adaptable communication infrastructure required to ease the development of ubiquitous services and applications. Herein, we propose a clean slate network architecture to deploy ubiquitous services in a Pervasive and Ubiquitous Computing environment. The architecture is designed to avoid hierarchical layering, so we propose a serviceoriented approach for a flow-oriented context-aware network architecture where communications are composed on the fly (using reusable components) according to the needs and requirements of the consumed service.

  • Improving Security Applications Using Indoor Location Systems on Wireless Sensor Networks

     Paradells Aspas, Jose; Vilaseca, Jordi; Casademont Serra, Jordi
    International Conference in Advances in Computing, Communication and Control
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • An asymmetric access point for solving the unfairness problem in WLANs

     Lopez Aguilera, Maria Elena; Heusse, M; Grunenberger, Y; Rousseau, F; Duda, A; Casademont Serra, Jordi
    IEEE transactions on mobile computing
    Date of publication: 2008-10
    Journal article

     Share Reference managers Reference managers Open in new window

  • Ubiquitous Web Access: Collaborative optimization and dynamic content negotiation

     Sanchez-Loro, Xavier; Victoria, Beltran; Casademont Serra, Jordi
    International journal of multimedia and ubiquitous engineering
    Date of publication: 2008-07
    Journal article

     Share Reference managers Reference managers Open in new window

  • Contributions to the Evaluation and Enhancement of WLAN IEEE 802.11 Medium Access Control Mechanism

     Lopez Aguilera, Maria Elena
    Defense's date: 2008-06-16
    Department of Telematics Engineering, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Infopoints2

     Casademont Serra, Jordi; Paradells Aspas, Jose; Garcia Villegas, Eduard
    Participation in a competitive project

     Share

  • Ubiquitous Web Access: Collaborative Optimization and Dynamic Content Negotiation

     Sánchez Loro, Xavier; Beltran Querol, Vicenç; Casademont Serra, Jordi; Catalan, M
    International Workshop on Interative Multimedia & Intelligent Services in MUC (IMIS '08)
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Impact of the security mechanisms on the performance of 802.15.4/ZigBee networks

     Casademont Serra, Jordi
    Workshop in Information Security Theory and Practice
    Presentation's date: 2008-05-13
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Ubiquitous Web Access and Application Layer Optimization: Dynamic Content Negotiation over Cellular Links

     Sánchez Loro, Xavier; Beltran Sanchidrian, Victòria; Casademont Serra, Jordi; Catalan Cid, Maria Luisa
    3rd International Conference on Grid and Pervasive Computing
    Presentation's date: 2008-05-25
    Presentation of work at congresses

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

  • Impact of the security mechanisms on the performance of 802.15.4/ZigBee networks

     Gomez Montenegro, Carlos; Casademont Serra, Jordi; Paradells Aspas, Jose
    Workshop in Information Security Theory and Practice
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    El protocol Mobile IPv6. La mobilitat a Internet (III Part)  Open access

     Vidal Ferre, Rafael; Paradells Aspas, Jose; Casademont Serra, Jordi
    Telecos.cat. Enginyers de Telecomunicació
    Date of publication: 2007-03
    Journal article

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

  • Access to the full text
    Sobre la justicia en las redes IEEE 802.11e: desincronización de su mecanismo de acceso al medio  Open access

     López-Aguilera, E; Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Cotrina Navau, Josep
    Revista IEEE América Latina
    Date of publication: 2007-10
    Journal article

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

    Since the advent of the first IEEE 802.11 standard, several papers have proposed means of providing QoS to IEEE 802.11 networks and evaluate various traffic-prioritization mechanisms. Nevertheless, studies on the assignment of AIFS times defined in IEEE 802.11e reveal that the various priority levels work in a synchronized manner. The studies show that, under large loads of high-priority traffic, EDCA starves low-priority frames, which is undesirable. We argue that QoS traffic needs to be prioritized, but users sending best-effort frames should also obtain the expected service. High-priority traffic can also suffer performance degradation when using EDCA because of heavy loads of low-priority frames. Thus, we have proposed a mechanism based on desynchronizing the IEEE 802.11e working procedure. It prevents stations that belong to different priority classes from attempting simultaneous transmission, prioritizes independent collision groups and achieves better short-term and long-term channel access fairness. We have evaluated the proposal based on extensive analytical and simulation results. It prevents the strangulation of low-priority traffic, and, moreover, reduces the degradation of high-priority traffic with the increased presence of low-priority frames.

  • Diccionari de Telecomunicacions

     Aguilar Igartua, Mónica; Alcober Segura, Jesus Angel; Altes Bosch, Jorge; Aragones Cervera, Xavier; Artigas Garcia, David; Bardes Llorensi, Daniel; Barlabe Dalmau, Antoni; Bragos Bardia, Ramon; Calderer Cardona, Josep; Cardama Aznar, Angel; Casademont Serra, Jordi; Casals Ibañez, Lluis; Comeron Tejero, Adolfo; Cotrina Navau, Josep; Cruz Llopis, Luis Javier de La; Dios Otin, Victor Federico; Duxans Barrobes, Helena; Esparza Martin, Oscar; Esquerra Llucià, Ignasi; Garcia Vizcaino, David; Garcies Salva, Pau; Gomez Montenegro, Carlos; Gorricho Moreno, Juan Luis; Guinjoan Gispert, Francisco; Hesselbach Serra, Xavier; Liria Righetti, Antoni; Lopez Salcedo, Jose Antonio; Madrenas Boadas, Jordi; Madueño Ruiz, María Isabel; Mestre Pons, Francesc Xavier; Monte Moreno, Enrique; Morros Rubió, Josep Ramon; Muñoz Tapia, Jose Luis; Pallares Segarra, Esteve; Pons Nin, Joan; Recolons Martos, Jaume; Rincon Rivera, David; Riu Costa, Pere Joan; Ruiz Vela, Inmaculada; Pradell Cara, Lluis; Pascual Iserte, Antonio; Prat Viñas, Luis; Rey Micolau, Francesc; Villares Piera, N. Javier
    Date of publication: 2007-03
    Book

     Share Reference managers Reference managers Open in new window

  • Channel access unfairness of wireless LAN access methods

     Lopez Aguilera, Maria Elena; Heusse, M; Rousseau, F; Duda, A; Casademont Serra, Jordi
    IEEE Workshop on Local and Metropolitan Area Networks 2007 (LANMAN)
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Segur@

     Paradells Aspas, Jose; Casademont Serra, Jordi; Garcia Villegas, Eduard; Gomez Montenegro, Carlos
    Participation in a competitive project

     Share

  • Inredis

     Casademont Serra, Jordi; Paradells Aspas, Jose; Gomez Montenegro, Carlos
    Participation in a competitive project

     Share

  • Infopoints

     Paradells Aspas, Jose; Casademont Serra, Jordi
    Participation in a competitive project

     Share

  • Sobre la justicia en las redes IEEE 802.11e: Desincronización de su mecanismo de acceso al medio

     Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Cotrina Navau, Josep
    Jornadas de Ingeniería Telemática
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Optimization of presence enabled services over cellular networks based on a personal proxy

     Sanchez-Loro, X; Casademont Serra, Jordi; Ferrer, J L; Paradells Aspas, Jose
    European Conference of Internet and multimedia systems and applications (EuroIMSA 2007)
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • A proxy-based solution for device capabilities detection

     Sanchez-Loro, Xavier; Casademont Serra, Jordi; Ferrer, J L; Paradells Aspas, Jose
    European Conference of Internet and multimedia systems and applications (EuroIMSA 2007)
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    El protocol Mobile IP. La mobilitat a Internet (II Part)  Open access

     Vidal Ferre, Rafael; Paradells Aspas, Jose; Casademont Serra, Jordi
    Telecos.cat. Enginyers de Telecomunicació
    Date of publication: 2006-12
    Journal article

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

  • Access to the full text
    La mobilitat a Internet (I Part)  Open access

     Vidal Ferre, Rafael; Paradells Aspas, Jose; Casademont Serra, Jordi
    Telecos.cat. Enginyers de Telecomunicació
    Date of publication: 2006-09
    Journal article

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

  • A transmit power control proposal for IEEE 802.11 cellular networks

     Lopez-Aguilera, E; Lopez Aguilera, Maria Elena; Casademont Serra, Jordi
    Workshop on Applications and Services in Wireless Networks
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Evaluating Wireles LANs Access Methods in Presence of Noise

     Lopez Aguilera, Maria Elena; Heusse, Martin; Grunenberger, Yan; Rousseau, Franck; Duda, Andrzej; Casademont Serra, Jordi; Duda, Andrzej
    IEEE International Conference on Computer Communications (INFOCOM)
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Transmit power control mechanisms in IEEE 802.11 cellular networks

     López-Aguilera, E; Lopez Aguilera, Maria Elena; Casademont Serra, Jordi
    International Wireless Communications and Mobile Computing Conference (IWCMC)
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Demostrador de la Televisión interactiva en el móvil

     Paradells Aspas, Jose; Casademont Serra, Jordi; Calveras Auge, Ana M.; Lopez Aguilera, Maria Elena
    Jornadas Telecom I+D
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • 2005SGR-00366 Grupo de Redes Inalámbricas

     Paradells Aspas, Jose; Casademont Serra, Jordi; Garcia Villegas, Eduard
    Participation in a competitive project

     Share

  • TEC2006-4504: Interconectividad de Redes Heterogéneas Malladas Autoconfigurables

     Casademont Serra, Jordi; Paradells Aspas, Jose; Garcia Villegas, Eduard; Gomez Montenegro, Carlos
    Participation in a competitive project

     Share

  • Performance of wireless LAN access methods in multicell environments

     Lopez Aguilera, Maria Elena; Heusse, M; Rousseau, F; Duda, A; Casademont Serra, Jordi
    IEEE Global Communications Conference
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Families of traceability codes based on the Chinese Remainder Theorem

     Cotrina Navau, Josep; Fernandez Muñoz, Marcel; Casademont Serra, Jordi
    2006 IEEE Information Theory Workshop
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window