R. Rodriguez-Rubio

• University of Vigo

The innovative information-based Named-Data Networking (NDN) architecture provides a good opportunity to rethink many of the design decisions that are taken for granted in the Internet today. For example, active queue management (AQM) tasks have been traditionally implemented in the routers to alleviate network congestion before their buffers fill...

In the next few years, Low Earth Orbit (LEO) constellations will become key enablers for the deployment of global Internet of Things (IoT) services. Due to their proximity to Earth, LEO satellites can directly communicate with ground nodes and, thus, serve as mobile gateways for IoT devices deployed in remote areas lacking terrestrial infrastructur...

The efforts to replace the successful, albeit aging, TCP/IP Internet architecture with a better suited one have driving research interest to information-centric alternatives. The Named Data Networking (NDN) architecture is probably one of the main contenders to become the network layer of the future Internet thanks to its inbuilt support for mobili...

The efforts to replace the successful, albeit aging, TCP/IP Internet architecture with a better suited one have driving research interest to information-centric alternatives. The Named Data Networking (NDN) architecture is probably one of the main contenders to become the network layer of the future Internet thanks to its inbuilt support for mobili...

Low Earth orbit (LEO) satellite constellations are increasingly gaining attention as future global Internet providers. At the same time, named data networking (NDN) is a new data-centric architecture that has been recently proposed to replace the classic TCP/IP architecture since it is particularly well suited to the most common usage of the Intern...

In this study, as the last step of a longitudinal study of the impact of social learning and gamification methodologies on learning results in higher education, we have recorded the activity in a software platform based on Moodle, specially built for encouraging online participation of the students to design, carry out and evaluate a set of learnin...

There are some important traffic concepts that are more easily understood when dealing with circuit switched networks than with packet switched ones. One of them is the impact on the overall network behavior of flexible routing of communication requests oblivious to the route length as will probably occur in the new low earth orbit satellite networ...

Control Variates (CV) is a Variance Reduction technique used in order to shorten simulation experiments. In a previous work we presented Time-to-idle as a stochastic process strongly correlated with the queue waiting time processes in the di erent queues of a polling service discipline network. Time-to-idle sample values are asynchronous with respe...

The issue of energy balancing in Wireless Sensor Networks is a pivotal one, crucial in their deployment. This problem can be subdivided in three areas: (i) energy conservation techniques, usually implying minimizing the cost of communication at the nodes since it is known that the radio is the biggest consumer of the available energy; (ii) energy-h...

Wind energy harvesting technology is one of the most popular power sources for wireless sensor networks. However, given its irregular nature, wind energy availability experiences significant variations and, therefore, wind-powered devices need reliable forecasting models to effectively adjust their energy consumption to the dynamics of energy harve...

The low power idle mode implemented by Energy Efficient Ethernet (EEE) allows network interfaces to save up to 90% of their nominal energy consumption when idling. There is an ample body of research that recommends the use of frame coalescing algorithms—that enter the low power mode as soon as there is no more traffic waiting to be sent, and delay...

The low power idle mode implemented by Energy Efficient Ethernet (EEE) allows network interfaces to save up to 90% of their nominal energy consumption when idling. There is an ample body of research that recommends the use of frame coalescing algorithms---that enter the low power mode as soon as there is no more traffic waiting to be sent, and dela...

Sunlight is one of the most frequently used ambient energy sources for energy harvesting in wireless sensor networks. Although virtually unlimited, solar radiation experiences significant variations depending on the weather, the season, and the time of day, so solar-powered nodes commonly employ solar prediction models to effectively adapt their en...

Earlier studies have shown the power of online learning systems data to develop prediction methods that try to identify successful students patterns of accomplishment and engagement to allow timely pedagogical interventions. Our learning platform, SocialWire, collects a detailed record of the students' activity so, in this paper, we compare and com...

In this paper, we apply a hypothesis test for identifying the type of long-memory time series to non-Gaussian processes as the M/G/inf process. We consider one application of the test: assessing the significance of increasing the number of parameters within a given class of models. The results obtained demonstrated that the test exhibits good power...

Simulations with long-range dependent or self-similar input processes are hindered both by the slowness of convergence displayed by the output data and by the high computational complexity of the on-line methods for generating the input process. In this paper, we present optimized algorithms for simulating efficiently the occupancy process of a M/G...

Video represents a larger and larger portion of the traffic in Internet. This traffic is characterized by a high burstiness and a strong short- and long-range correlation, that is very important from the performance point of view. Particularly, the efficient generation of synthetic sample paths is fundamental because real traces are usually of limi...

Service differentiation is an open research issue in OBS networks. Most proposals assume full wavelength-conversion, but wavelength converters are still very complex and expensive. We propose the QoS Multiple Wavelength Simultaneous Transmission technique ( QoS-MWST ), a novel method for providing loss differentiation in OBS networks without wavele...

Proportional loss differentiation in OBS networks has recently received much attention since it allows to provide a quantitative differentiation between classes, so facilitating network operations and pricing to providers, but without the complexity involved by the absolute loss differentiation. Although edge-to-edge differentiation must be the ult...

The rapid advances in optical transmission technology have led to a wide deployment of WDM-based networks, and OBS is considered as a promising switching technology in the optical domain.A major problem in OBS is undoubtedly burst contention. Different mechanisms to reduce burst loss probability have been proposed, but multipath routing has many ad...

Several traffic measurements reports have shown the presence of persistent correlations in current networ Its. The essence of this behavior can be captured by several classes of stochastic processes. The M/G/infin process plays a key role for this purpose. In addition to its theoretical simplicity, it has been successfully used to model widely diff...

With the increasing popularity of multimedia applications, video data represents a large portion of the traffic in modern networks. Consequently, adequate models of video traffic, characterized by a high burstiness and a strong positive correlation, are very important for the performance evaluation of network architectures and protocols. This paper...

We propose a scheme for providing differentiated services in an optical burst switching network environment. Our framework considers differentiation among several traffic classes in packet loss probability, assuming only that the network differentiates neatly between two classes of bursts. We formulate a reduced load fixed point model for evaluatin...

With the increasing popularity of multimedia applications, video data represents a large portion of the traffic in modern networks. Consequently, adequate models of video traffic, characterized by a high burstiness and a strong positive correlation, are very important for the performance evaluation of networks architectures and protocols. In this p...

Several traffic measurements reports have convincingly shown the presence of self-similarity in current networks, inducing a revolution in the stochastic modeling of traffic. The essence of this behavior can be captured by several classes of self-similar processes. But the use of these processes in performance analysis has opened new problems and r...

This paper addresses the provision of proportional differentiated services to an arbitrary number of traffic classes in terms of the class packet loss probability measured between the ingress node and the egress node of an OBS network. Our solution relies on a key idea: OBS networks consist of bufferless nodes and can therefore be regarded as a who...

MPEG video traffic is expected to represent most of the load in the future high-speed networks. Adequate traffic models for MPEG Variable Bit-Rate (VBR) video are thus important for network design, performance evaluation, admission control and resource allocation. Many models for VBR video traffic have been proposed in the literature. However, whi...

The differentiated services (DiffServ) framework provides a simple and scalable methodology for addressing quality of service issues in IP networks. Service differentiation can be achieved through the assured forwarding (AF) per hop behavior packet-handling scheme. One of the more challenging research issues in DiffServ networks is the fair distrib...

One weakness of the RED algorithm typical of routers in the current Internet is that it allows unfair bandwidth sharing when a mixture of traffic types shares a link. This unfairness is caused by the fact that, at any given time, RED imposes the same loss probability on all flows, regardless of their bandwidths. In this paper, we propose Random Ra...

MPEG video traffic is expected to represent most of the load in the future high-speed networks. Adequate traffic models for MPEG Variable Bit-Rate (VBR) video are important for network design, performance evaluation, admission control and resource allocation. It is well-known that VBR video exhibits long-range correlations over arbitrarily long tim...

The Differentiated Services architecture is a simple and scalable approach to provide Quality of Service (QoS) in IP Networks. Several studies have shown that the number of microflows in aggregates, the round trip time (RTT) or the mean packet size are key factors in the throughput of aggregates obtained using this architecture. In this paper, we e...

Several traffic measurement reports have convincingly shown the presence of self-similarity at the packet level in current networks, inducing as a result a revolution in the stochastic modeling of traffic. The essence of this behavior can be adequately captured by several classes of self-similar stochastic processes. But the use of these in perform...

In last decade, we have seen the first steps to the end of passive television. Thanks to continuous advances in hardware and software, digital TV technology is now mature enough to enhance traditional TV sets (limited to content reproduction) with computing capability to run multimedia software integrating richer formats. A significant example of t...

Several traffic measurement reports have convincingly shown the presence of self-similarity at the packet level in current networks, inducing as a result a revolution in the stochastic modeling of traffic. The essence of this behavior can be adequately captured by several classes of self-similar stochastic processes. But the use of these in perform...

The versatility of the XML language is one of its main strengths, and thus it is suitable for being used in a very wide range of applications that entail structuring, exchanging and processing the information. This versatility has favored its widespread acceptance, an important advantage for its introduction in the standardization processes. In thi...

Several recent traffic measurement studies have convincingly shown the presence of self-similarity in modern high-speed networks, involving a very important revolution in the stochastic modeling of traffic. Thus the use of self-similar processes has opened new problems and research fields in network performance analysis, mainly in simulation studie...