Mobile ad-hoc network performance assessment based on simulation with scenario specific propagation and multi-link modelling: Designing a communication system for disaster relief in the Philippines
Translated title
Mobile ad-hoc network performance assessment based on simulation with scenario specific propagation and multi-link modelling
Author
Bruun, Rasmus Liborius
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-07
Pages
70
Abstract
Ved naturkatastrofer kan mobil- og kabelbaserede net falde ud, så berørte områder mister kommunikationen. Reachi er et system, der kombinerer mobile ad hoc-enheder (som kan forbinde direkte uden fast infrastruktur) med en gateway, så indsatsledere kan kommunikere med hold ved katastrofens epicenter. Denne afhandling specificerer en multilink-model, der beskriver de trådløse forbindelser (links) i et Reachi-udrulningsområde. Modellen medtager rumlig korrelation—at nærliggende links ofte oplever lignende signalforhold—en faktor som ofte overses i netværksvurderinger. Modellen anvendes i computersimulationer. I simulationerne giver inddragelse af rumlig korrelation konsekvent lavere netværksydelse end en tilsvarende model, der antager uafhængige links. Resultaterne er vigtige for udformningen af Reachi-systemets protokoller på linklaget (hvordan enheder deler radiokanalen) og netværkslaget (rutevalg). Linklagsprotokoller bør synkronisere netværket og bygge på randomisering. Der kræves yderligere evaluering for at vælge mellem en proaktiv rutevalgsmetode (vedligeholder ruter på forhånd) og en reaktiv (finder ruter efter behov).
Natural disasters can knock out cellular and wired networks, leaving affected areas without communication. Reachi is a system that combines mobile ad hoc networking devices (which connect directly without fixed infrastructure) with a gateway so relief coordinators can communicate with teams at the center of the disaster. This thesis specifies a multi-link model that describes the wireless connections (links) in a Reachi deployment. The model includes spatial correlation—the fact that nearby links often experience similar signal conditions—an often overlooked factor in network evaluations. We use this model in computer simulations. Across simulations, including spatial correlation leads to consistently lower network performance than an equivalent model that treats links as independent. These results are important for designing Reachi’s protocols at the link layer (how devices share the radio channel) and the network layer (routing). Link-layer protocols should synchronize the network and rely on randomization. Further evaluation is needed to choose between a proactive routing scheme (maintaining routes in advance) and a reactive one (finding routes on demand).
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