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Your search keyword '"Rodriguez-Colina, Enrique"' showing total 23 results
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23 results on '"Rodriguez-Colina, Enrique"'

2. Modeling and Performance Evaluation of a Cellular Network with OMA and NOMA Users with Batch Arrivals by Means of an M [X] / M / S /0 Model.

Author

Vásquez-Toledo, Luis Alberto, González-Flores, Carlos, Lopez-Guerrero, Miguel, Prieto-Guerrero, Alfonso, Tirado-Méndez, José Alfredo, Marcelín-Jiménez, Ricardo, Rodriguez-Colina, Enrique, Pascoe-Chalke, Michael, and Castillo-Soria, Francisco R.

Subjects
COGNITIVE radio, GENERATING functions, WIRELESS communications, MARKOV processes, TELECOMMUNICATION traffic
Abstract

Nowadays, efficient spectrum usage is one of the most important design principles to take into account in wireless communications due to the exponential growth of mobile devices. In that sense, solutions such as Non-Orthogonal Multiple Access (NOMA) and cognitive radio (CR) have been proposed. In essence, NOMA allows some interference level by using non-orthogonal resource allocation with a tolerable increase in receiver complexity employing successive interference cancellation (SIC). In this work, a novel mathematical model of teletraffic for users performing accessment, simultaneously, by means of Orthogonal Multiple Access (OMA) and NOMA, is developed using a Markovian process that considers bursts of arrivals to model the access schemes. This novel procedure implies a closed-form solution of the proposed system compared to other works where these parameters are estimated assuming the moment generating function obtained with approximation models. The model is validated with a discrete event simulator, considering different scenarios and simulation conditions. The simulation results are in agreement with the mathematical solution proposed. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Congestion Control for a Fair Packet Delivery in WSN: From a Complex System Perspective

Author

Aguirre-Guerrero, Daniela, Marcelín-Jiménez, Ricardo, Rodriguez-Colina, Enrique, and Pascoe-Chalke, Michael

Subjects
Article Subject, Computer science, Control (management), Complex system, lcsh:Medicine, lcsh:Technology, General Biochemistry, Genetics and Molecular Biology, Network performance, lcsh:Science, General Environmental Science, lcsh:T, business.industry, Network packet, lcsh:R, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, General Medicine, Network traffic control, Network congestion, Software deployment, Remote Sensing Technology, lcsh:Q, business, Wireless Technology, Wireless sensor network, Algorithms, Research Article, Computer network
Abstract

In this work, we propose that packets travelling across a wireless sensor network (WSN) can be seen as the active agents that make up a complex system, just like a bird flock or a fish school, for instance. From this perspective, the tools and models that have been developed to study this kind of systems have been applied. This is in order to create a distributed congestion control based on a set of simple rules programmed at the nodes of the WSN. Our results show that it is possible to adapt the carried traffic to the network capacity, even under stressing conditions. Also, the network performance shows a smooth degradation when the traffic goes beyond a threshold which is settled by the proposed self-organized control. In contrast, without any control, the network collapses before this threshold. The use of the proposed solution provides an effective strategy to address some of the common problems found in WSN deployment by providing a fair packet delivery. In addition, the network congestion is mitigated using adaptive traffic mechanisms based on a satisfaction parameter assessed by each packet which has impact on the global satisfaction of the traffic carried by the WSN.

Published
2014
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