Análise de desempenho de protocolos de roteamento Ad hoc DTN em redes de emergência

Abstract

Mobile Computing Networks are autonomous self-organizing and having a dynamic network topology. Those networks are ad hoc networks composed of mobile devices equipped with one or more transceivers, which employ wireless standards such as WiFi, WiMax. Due to node mobility, the topology may be highly dynamic, and assuch network partitions may occur. As a consequence, some devices will not be able to communicate with parts of the network or with a central server. Routing protocols for mobile networks must thus tolerate interruptions and enable communications, while using the least amount of resources. In order to do so, routing protocols must incorporate characteristics of both MANET and DTN protocols. In this masters dissertation we present a performance evaluation of the most important MANET and DTN routing protocols found in the literature. We evaluate metrics such as delivery rate and packet delays, but also energy consumption and the amount of discarded messages. Routing protocols for MANETs and DTNs were implemented in NS-2.3, and their performance was evaluated. Thus, we identify the main characteristics of MANET and DTN protocols that maximize the performance on different scenarios, and also present a comparative study that can be used as basis for the proposal of new integrated DTN-MANET routing protocols.The simulation results confirm that DTN protocols deliver significantly more messages than MANET-based communication protocols when node density is low and node mobility is high. However, in high density and low mobility scenarios, DTN-based communication protocols present much higher energy consumption and message delays than MANET-based communication protocols.