Person: Prieto Suárez, Iria
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Prieto Suárez
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Iria
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Automática y Computación
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7276
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Publication Open Access Midiendo retardos y pérdidas en las redes móviles de alta velocidad(2015) Prieto Suárez, Iria; Izal Azcárate, Mikel; Magaña Lizarrondo, Eduardo; Morató Osés, Daniel; Automática y Computación; Automatika eta KonputazioaMobile networks are constantly evolving, but still, due to their nature, it is not trivial to analayse how they face up different kinds of traffic. On the Internet a wide range of services can be found. Usually the majority send large packets, i.e Web services, but others, like VoIP, send small packets. The question is how the mobile networks manage all this traffic. In this work experiments to measure losses and times of sending different packet size bursts are described. Also, preliminary results for experiments with a real network mobile client, are analaysed showing that the performance of the network is different depending on the size of packet.Publication Open Access Traffic generator using Perlin Noise(IEEE, 2012) Prieto Suárez, Iria; Izal Azcárate, Mikel; Morató Osés, Daniel; Magaña Lizarrondo, Eduardo; Automática y Computación; Automatika eta Konputazioa; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaStudy of high speed networks such as optical next generation burst or packet switched networks require large amounts of synthetic traffic to feed simulators. Methods to generate self-similar long range dependent traffic already exist but they usually work by generating large blocks of traffic of fixed time duration. This limits simulated time or require very high amount of data to be stored before simulation. On this work it is shown how self-similar traffic can be generated using Perlin Noise, an algorithm commonly used to generate 2D/3D noise for natural looking graphics. 1-dimension Perlin Noise can be interpreted as network traffic and used to generate long range dependent traffic for network simulation. The algorithm is compared to more classical approach Random Midpoint Displacement showing at traffic generated is similar but can be generated continuously with no fixed block size.Publication Open Access Detecting disruption periods on TCP servers with passive packet traffic analysis(IARIA, 2015) Prieto Suárez, Iria; Izal Azcárate, Mikel; Magaña Lizarrondo, Eduardo; Morató Osés, Daniel; Automática y Computación; Automatika eta KonputazioaThis paper presents a simple passive algorithm to monitor service availability. The algorithm is based on packet counting over a passive traffic trace of a population of clients accessing servers of interest. The major advantage of the algorithm is that it is passive and thus not invasive while usual monitor systems that can be found on Internet are active probing agents. The proposed system does not communicates to actual servers. It is easy to build as an online monitoring system with no big constraints in software or hardware. It does not relay on a distributed number of network placements for probing agents but works on a single network observing point near network edge. Initial proof of work of the algorithm is presented by analyzing unavailability problems for popular servers at an academic network at Public University of Navarre.Publication Open Access TNS research in progress(Universidad Politécnica de Cartagena, Servicio de Documentación, 2012) Izal Azcárate, Mikel; Prieto Suárez, Iria; Espina Antolín, Félix; Morató Osés, Daniel; Magaña Lizarrondo, Eduardo; Automática y Computación; Automatika eta Konputazioa; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaThis paper summarizes latest works of Telematic, Networks and Services research group (TNS) of Public University of Navarra in the topics of FIERRO thematic network. Last two papers sent to major conferences are addressed First work shows how self-similar traffic can be generated using Perlin Noise, an algorithm commonly used to generate 2D/3D noise for natural looking graphics. 1-dimension Perlin Noise can be interpreted as network traffic and used to generate long range dependent traffic for network simulation. The algorithm is compared to more classical approach Random Midpoint Displacement showing at traffic generated is similar but can be generated continuously with no fixed block size. Second work presents two novel cloning schemes for video delivery in OBS networks that dramatically improve user perceived content quality. These schemes take into account the special characteristics of compressed video traffic. Analytical and simulation results show up to 40% QoE improvement without a substantial increase in the overall network traffic and without increasing the number of bursts in the network. The results show the strong dependency of this novel cloning scheme on the video traffic structure due to the coding mechanisms.Publication Open Access A passive traffic algorithm for detecting unavailable periods in TCP services(IARIA, 2015) Prieto Suárez, Iria; Izal Azcárate, Mikel; Magaña Lizarrondo, Eduardo; Morató Osés, Daniel; Automática y Computación; Automatika eta KonputazioaThis paper presents a simple passive algorithm to monitor service availability. The algorithm is based on packet counting over a passive traffic trace of a population of clients accessing servers of interest. The major advantage of the algorithm is that it is passive and thus not invasive while usual monitor systems that can be found on Internet are active probing agents. The proposed system does not communicate to actual servers. It is easy to build as an online monitoring system with no big constraints in software or hardware. It does not relay on a distributed number of network placements for probing agents but works on a single network observing point near network edge. Initial proof of work of the algorithm is presented by studying the influence of different kinds of disruptions on packet level traffic and analyzing unavailability problems for popular servers at an academic network at Public University of Navarre.Publication Open Access A simple passive method to estimate RTT in high bandwidth-delay networks(IARIA, 2015) Prieto Suárez, Iria; Izal Azcárate, Mikel; Magaña Lizarrondo, Eduardo; Morató Osés, Daniel; Automática y Computación; Automatika eta KonputazioaThis paper presents a simple passive algorithm to estimate the Round-Trip-Time (RTT) of a TCP connection in high bandwidth-delay network scenarios. In these scenarios, a passive RTT estimator that can be used on captured packet traces is a useful tool for performance analysis. The algorithm is based on observing periodic RTT patterns in a TCP connection that is not filling its bandwidth×delay product. The results are compared to other passive methods such as the RTT of initial TCP handshake or TCP Timestamp option samples. The algorithm is shown to be effective and may be used in more scenarios than other methods thus, it provides a valuable tool to improve the amount of TCP connection whose RTT can be measured in a captured packet trace.