Browsing by Author "Quinde Romero, Christian Patricio"

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Análisis del rendimiento de los protocolos OLSR, DSDV y AODV en una red MANET
(2021) González Martínez, Santiago Renán; Quinde Romero, Christian Patricio; Astudillo Picon, Paúl Alejandro
This paper presents an analysis and comparison between the proactive routing protocols OLSR and DSDV and the reactive routing protocol AODV in a MANET network. Two scenarios were defined, the first one representing a soccer team attacking and the second one defending. To simulate each scenario the area of movement of the nodes (players) was varied. For this purpose, an investigation was carried out on the problems presented by these routing algorithms for Ad Hoc networks in different environments. In this way, an overview of the strategies and solutions that currently exist is obtained. Based on the information gathered, it is proposed to perform a simulation using NS3 in order to obtain results that resemble reality. The comparison is made based on throughput, PDR and Delay metrics. In each simulation, parameters such as node velocity and initial position are adjusted according to the behaviour of a real soccer player. The nodes move in a random trajectory within the specific area and one of them sends data to a fixed server node located at the edge of the area where the nodes move, simulating the bench where the receiver is located. The transmitted traffic is characterized to simulate realistic biometric data. From the results, it is concluded that AODV and DSDV have better performance than OLSR and the optimum transmission interval is 20 seconds. In addition, with a transmit power of 10 dBm, 100% throughput is guaranteed at the receiver.
Evaluación y comparación de códecs de video para el despliegue de un sistema de comunicación resiliente
(2022) Palacios Serrano, Iván Santiago; Astudillo Picon, Paúl Alejandro; Quinde Romero, Christian Patricio; González Martínez, Santiago Renán
In emergency scenarios, it is usually difficult to rely on network infrastructure, especially in remote or geographically difficult-to-access locations. However, it is necessary to have tools to communicate or assess the situation. Therefore, ad hoc networks emerge as an option to solve this problem. This paper proposes the development of an emergency communication system for the transmission of multimedia traffic in a real scenario, between the different floors of a building. For this purpose, multiple experiments were carried out to determine the values of fundamental metrics (e.g., packet loss, delay, and throughput) for real-time audio and video transmission. Specifically, open-source tools were developed with the ability to extract the required metrics and objectively compare video quality using current encoding mechanisms (e.g., VP8, VP9, H.264, H.265). The results obtained show that VP8 is the most suitable codec for the proposed scenario. In addition, a videoconferencing tool was developed with the ability to adapt the video characteristics (e.g., bitrate) according to the network conditions.
Sistema de comunicación resiliente para escenarios de emergencia
(Universidad de Cuenca, 2022-03-09) Astudillo Picón, Paul Alejandro; Quinde Romero, Christian Patricio; González Martínez, Santiago Renán; Palacios Serrano, Iván Santiago
In emergency or rescue scenarios it is usually difficult to have a network infrastructure in place, especially in remote or geographically difficult-to-access locations. However, it is necessary to have tools to communicate or assess the situation. In this sense, ad hoc networks emerge as an option to solve this problem. Within the research project “IoT technologies and wireless sensor networks applied to structural health monitoring in essential buildings in the city of Cuenca”, a multi-hop ad hoc network was implemented in the main building of the Empresa Eléctrica Regional Centro Sur. In this context, this thesis work proposes the development of an emergency communication system for the transmission of multimedia traffic between the different floors of the building using the available ad hoc network. To this end, multiple experiments were carried out to determine the values of fundamental metrics (e.g. packet loss, delay, and throughput) for real-time audio and video transmission. Specifically, open source tools were developed to extract the required metrics and to objectively compare video quality using current encoding mechanisms (e.g. VP8, VP9, H.264, H.265). The results obtained determined VP8 as the most suitable codec for the proposed scenario. In addition, a videoconferencing tool was developed to measure the bandwidth available in the network and to select the appropriate bitrate to maintain an acceptable communication quality. The Real Time Transport Protocol (RTP) was used to transmit and synchronize audio and video streams. In addition, the Real Time Transport Control Protocol (RTCP) was used to measure metrics such as packet loss and delay using fields of this protocol present in the frames