Hacia un Internet de las Cosas "Importantes"

Esteban Municio · 29-05-2022 10:00 · Crónicas científicas

El Internet de las Cosas (IoT en inglés, es un concepto que se refiere a una interconexión digital de objetos cotidianos con internet) ha estado prometiendo revolucionar el mundo desde hace ya bastantes años. El IoT está presente actualmente en dispositivos muy sencillos. Por ejemplo, todos podemos medir nuestro pulso, monitorizar la temperatura de la casa y controlar las luces del salón. Sin embargo, esto no es algo que haya cambiado nuestras vidas radicalmente, como se prometía hace ya más de 10 años. La prometida revolución está llevando más tiempo del esperado

 

Idealmente, una sociedad necesitaría objetos que se comuniquen fiablemente, con bajo retardo, y que no consuman sus baterías demasiado rápido. Sin estas características, es difícil que el IoT se use en las cosas “importantes” de verdad. El Internet de las Cosas pasará a ser el “Internet de las Cosas Superfluas” en lugar de el “Internet de las Cosas Importantes”.

 

Actualmente, el IoT Industrial es único capaz de proporcionar estas características con éxito. Debido a la naturaleza crítica e indispensable de sus requisitos, los casos de uso de IoT con calidad de servicio de grado industrial (como por ejemplo, el monitoreo de recursos en una plataforma de perforamiento en alta mar, o la gestión de procesos industriales en refinerías) requieren tecnologías de IoT que garanticen un funcionamiento determinístico, bajo retardo de comunicación (muchas veces un paquete de datos retrasado puede ser igual de inútil que un paquete perdido), y un muy bajo consumo de energía.

 

En esta entrada de blog tomo el IoT Industrial como punto de partida y te sugiero la siguiente pregunta: ¿podemos exprimir un poco más el IoT Industrial para sacar todavía más de él? Basado en la tesis doctoral que defendí hace ya casi dos años, yo diría que sí. Dos de las contribuciones más importantes de mi tesis se centraron casos de uso tradicionales del IoT Industrial hacia ideas sin precedentes en el área.

 

  • Piensa en un festival de música, donde miles de personas llevan pulseras inteligentes (similares a las que utilizas para medir cuántas calorías quemas al correr). ¿Podríamos usar tecnologías IoT con calidad de servicio industrial, pero baratas, para permitir nuevas y mejores aplicaciones en este contexto? Por ejemplo, imagina que se pudieran pagar las consumiciones a través de la pulsera, sincronizar los LEDs en las pulseras en el público para mostrar patrones y figuras durante una canción o que las pulseras interaccionen entre ellas para fines sociales. Las redes IoT industriales típicamente se diseñan para entornos industriales estáticos (con unos pocos nodos que permanecen inmóviles). ¿Podríamos escalar las redes IoT industriales, hasta varios miles de nodos (pulseras) en entornos con mucha densidad de dispositivos? En mi tesis investigué la escalabilidad de 6TiSCH, una de las soluciones estandarizadas más efectivas y extendidas en el campo del IoT Industrial, e identifiqué los principales problemas que surgen cuando redes de este tipo crecen por encima de unas pocas docenas. Para ello, propuse dos enfoques. Primero, la inclusión de la capacidad multi-canal en algunos nodos de la red. Esto consiste en usar simultáneamente varios canales inalámbricos para evitar cuellos de botella en los recursos. Segundo, el uso de una nueva tecnología llamada DeBraS, especialmente diseñada para redes grandes y densas, para incrementar la escalabilidad de la red. Para entender un poco mejor lo que se consigue con DeBraS, imagínate intentando cruzar dos tipos de calle. Por la primera circula un tranvía que se mueve por sus vías siguiendo unos horarios. La segunda calle es… ¡una autopista! Una por la que pasan muchos coches constantemente. Como puedes imaginar, te resultaría mucho más fácil encontrar un momento adecuado para cruzar la calle del tranvía sin que te atropelle. En la autopista tendrías que mirar muy bien a ambos lados varias veces para empezar a correr hasta el otro lado. La idea de DebraS es precisamente obligarte a mirar bien a ambos lados de la autopista y elegir el momento oportuno en el que no pasan coches para cruzar (es decir, elegir la frecuencia y el momento exacto de enviar un paquete). DebraS hace que los nodos de la red “escuchen” a sus vecinos cuando estos envían paquetes de datos a la red, para así evitar que haya colisiones. Esto es algo que la tecnología 6TiSCH estándar no le hacía falta porque el tráfico de tranvías es mucho menor y estos pasan en momentos conocidos. Los resultados mostraron que DeBraS aumenta la tasa de envío por nodo, incrementando significativamente la escalabilidad de la red. El precio a pagar es un mayor consumo de energía. Sin embargo, para casos como el festival de música, donde se espera que las baterías de las pulseras inteligentes duren varios días, no debería ser un problema. A cambio, las pulseras pueden beneficiarse de las ventajas del IoT Industrial. Es decir, un funcionamiento determinista, retardo de comunicación bajo, y un consumo de energía relativamente bajo. Si te interesa un poco más el tema, en mi trabajo desarrollé un Simulador 6TiSCH con licencia de software libre para acotar y prototipar de manera rápida nuevas tecnologías basadas en 6TiSCH. Ver [1,2,3].

 

Foto de Melissa Askew en Unsplash

 

  • Imagínate ahora que vas en bicicleta con un grupo de amigos en los Pirineos, emulando una etapa reina del Tour de Francia. ¿Podríamos conseguir que los ciclistas pudieran ver el rendimiento y las estadísticas de cada uno de sus amigos, como su velocidad, su potencia o su ubicación en tiempo real? La tecnología WiFi no es lo suficientemente eficiente energéticamente y la red 3G/4G móvil no siempre está disponible en las zonas rurales. De nuevo, ¿podríamos aprovechar las tecnologías de IoT industrial, como 6TiSCH, para crear una red mallada inalámbrica y dinámica entre los ciclistas y aun así garantizar un rendimiento determinista, baja latencia de comunicación y bajo consumo de energía? Pues bien, el proyecto CONAMO, donde tuve un papel importante en el diseño y desarrollo del sistema de red, se centró precisamente en este problema. En este proyecto propuse modificar algunos mecanismos tradicionales de 6TiSCH para optimizar el funcionamiento de la red en un entorno tan dinámico. Esto consistió en hacer que cada nodo de la red elija en un momento dado, qué nodo es el mejor para enviar un paquete a un determinado destino y seleccione el intervalo de tiempo y la frecuencia correctos para enviarlo. También aumenté el rango de comunicación estándar de 6TiSCH disminuyendo su banda de frecuencias de 2.4 GHz a 868 MHz. Estas tareas fueron algunas de las más desafiantes de mi doctorado, ya que involucraron un complicado desarrollo de software y hardware, y pruebas de campo con ciclistas reales (entre ellos la Sociedad Real Ciclista Belga). Por suerte, este esfuerzo tuvo su recompensa. ¡Se llevó a cabo una demostración final con más de 20 ciclistas de ciclocross en Heverlee (Lovaina)! Aquí se puede encontrar un video sobre la demostración final de CONAMO:https://www.vrt.be/vrtnws/nl/2018/11/07/nieuwe-datatechnologie-volgt-prestaties-wielrenners-in-real-time/ (en neerlandés). Este trabajo sobre 6TiSCH es único en todo el mundo en términos de tamaño de red y movilidad de nodos, y está en la frontera de lo que las tecnologías de IoT Industrial pueden ofrecer fuera de su nicho industrial. Ver [4].

 

 

Finalmente, me gustaría señalar que gran parte de este trabajo no hubiera sido posible hacerlo solo. Como se suele decir, toda la investigación se construye “sobre los hombros de gigantes”. En mi caso, los gigantes de este doctorado fueron, por un lado, mis compañeros, fundamentales en mi tesis al llenar estas ideas de investigación con orientaciones, sugerencias y a veces matices un poco controvertidos. Por otro lado, la gran comunidad de código abierto, que ha compartido generosamente muchos proyectos, herramientas y conjuntos de datos interesantes, haciendo que el viaje de investigación sea más amable y humano.

 

[1] Esteban Municio, and Steven Latré. "Decentralized broadcast-based scheduling for dense multi-hop TSCH networks" In Proceedings of the MobiCom Workshop on Mobility in the Evolving Internet Architecture (MobiArch), pp. 19-24. ACM, 2016.

[2] Esteban Municio, Kathleen Spaey, and Steven Latré. "A distributed density optimized scheduling function for IEEE 802.15.4e TSCH networks" In Transactions on Emerging Telecommunications Technologies 29, no. 7 (2018): e3420.

[3] Esteban Municio, Glenn Daneels, Mališa Vučinić, Steven Latré, Jeroen Famaey, Yasuyuki Tanaka, Keoma Brun, Kazushi Muraoka, Xavier Vilajosana, and Thomas Watteyne. "Simulating 6TiSCH networks." In Transactions on Emerging Telecommunications Technologies 30, no. 3 (2019): e3494.

[4] Esteban Municio, Glenn Daneels, Mathias De Brouwer, Femke Ongenae, Filip De Turck, Bart Braem, Jeroen Famaey, and Steven Latré. "Continuous Athlete Monitoring in Challenging Cycling Environments using IoT Technologies" In IEEE Internet of Things Journal 6.6 (2019): 10875-10887.

 

 

 

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Este artículo nos lo envía Esteban Municio. Esteban es Ingeniero de Telecomunicaciones e Investigador especializado en redes trabajando actualmente para el grupo de AI-driven Systems de la Fundación i2CAT. Obtuvo su grado de Ingeniería en la Universidad Politécnica de Madrid (UPM) en 2013, su grado de Máster en Sistemas Telamáticos e Informáticos en la Universidad Rey Juan Carlos (URJC) en 2014, y su Doctorado en Informática en la Universidad de Amberes - imec en 2020. Después de su doctorado, continuó como Investigador Postdoctoral en la Universidad de Amberes - imec trabajando hasta 2022 en el área de redes IoT ultra fiables y programmabilidad de red extremo a extremo. Ha estado involucrado en diferentes proyectos europeos como FP7 TUCAN3G, Celtic+ FlexNet, H2020 ProTego, H2020 InterConnect, H2020 Vital-5G y H2020 DAEMON. Sus principales intereses de investigación son ingeniería de tráfico, SDN, redes inalámbricas programables, TSN, orquestación de redes y redes IoT industriales ultra fiables. También está interesado en redes de transporte heterogéneas, Smart Cities, redes comunitarias y provisión de conectividad en zonas rurales. Puedes encontrar más información sobre él en su página web: https://emunicio.github.io/

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