Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.6/3725
Título: Content storage and retrieval mechanisms for vehicular delay-tolerant networks
Autor: Silva, Bruno Miguel Correia
Orientador: Rodrigues, Joel José Puga Coelho
Palavras-chave: Content storage and retrieval
Cache
Web caching
Mobile ad-hoc networks caching
Vehicular ad-hoc networks caching
Delay-tolerant networks caching
Vehicular Delay-Tolerant networks
Data de Defesa: 2010
Resumo: Vehicular delay-tolerant networks (VDTNs) were proposed as a novel disruptive network concept based on the delay tolerant networking (DTN) paradigm. VDTN architecture uses vehicles to relay messages, enabling network connectivity in challenging scenarios. Due to intermittent connectivity, network nodes carry messages in their buffers, relaying them only when a proper contact opportunity occurs. Thus, the storage capacity and message retrieving of intermediate nodes directly affects the network performance. Therefore, efficient and robust caching and forwarding mechanisms are needed. This dissertation proposes a content storage and retrieval (CSR) solution for VDTN networks. This solution consists on storage and retrieval control labels, attached to every data bundle of aggregated network traffic. These labels define cacheable contents, and apply cachecontrol and forwarding restrictions on data bundles. The presented mechanisms gathered several contributions from cache based technologies such as Web cache schemes, ad-hoc and DTN networks. This solution is fully automated, providing a fast, safe, and reliable data transfer and storage management, while improves the applicability and performance of VDTN networks significantly. This work presents the performance evaluation and validation of CSR mechanisms through a VDTN testbed. Furthermore it presents several network performance evaluations and results using the well-known DTN routing protocols, Epidemic and Spray and Wait (including its binary variant). The comparison of the network behavior and performance on both protocols, with and without CSR mechanisms, proves that CSR mechanisms improve significantly the overall network performance.
URI: http://hdl.handle.net/10400.6/3725
Designação: Dissertação apresentada à Universidade da Beira Interior para a obtenção do grau de mestre em Engenharia Informática
Aparece nas colecções:FE - DI | Dissertações de Mestrado e Teses de Doutoramento

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