Mobile Ad Hoc Networks: the DHT paradigm

Caleffi, Marcello (2008) Mobile Ad Hoc Networks: the DHT paradigm. [Tesi di dottorato] (Inedito)

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In this thesis, the adoption of the hierarchical routing paradigm to achieve a scalable network layer for ad hoc networks has been proposed. The main concept of hierarchical routing is to keep, at any node, complete routing information about nodes which are close to it and lesser information about nodes located further away. The Augmented Tree-based Routing protocol, a routing protocol for ad hoc networks exploiting both a location-aware addressing schema and a distribute hash table (DHT) system, has been proposed. The adopted addressing schema allows nodes to adopt hierarchical routing, limiting so the overhead introduced in the network, while the DHT system provides the mapping between transient identifiers and node identities. Since the Augmented Tree-based Routing protocol adopts a multi-path strategy and since most studies in the area of multi-path routing focus on heuristic methods and the performances of these strategies are commonly evaluated by numerical simulations, an analytical framework to evaluate the performance gain achieved by multi-path routing has been proposed. The framework is based on on graph theory and on terminal-pair routing reliability (TPRR) as performance measure. Moreover, some features of the proposed protocol has been exploited design a peer-to-peer (P2P) system over a mobile ad hoc network (MANET) resorting to a cross-layer approach. It has been proved that simply deploying P2P systems over MANETs may cause poor performances. By coupling both the direct and the indirect key-based routing at the network layer and by resorting to the same hierarchical address space structure of ATR, we are able to build a P2P overlay network in which the logical proximity agrees with the physical one, limiting so the message overhead and avoiding the redundancy. Finally, by extending the proposed location-aware addressing to match with the opportunistic forwarding protocol, a novel routing protocol for disruption tolerant network (DTN) and delay tolerant network (DTN) has been proposed. By exploiting both the temporal diversity and the broadcast nature of the wireless propagation, such a protocol can enable connectivity in ad hoc environments characterized by non stationary wireless propagation as well as sparse topologies.

Tipologia di documento:Tesi di dottorato
Parole chiave:MANET, ad hoc, routing, DHT, hash table, multi-path, reliability, indirect routing.
Settori scientifico-disciplinari MIUR:Area 09 Ingegneria industriale e dell'informazione > ING-INF/03 TELECOMUNICAZIONI
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Stato del full text:Accessibile
Data:30 Novembre 2008
Numero di pagine:130
Istituzione:Università degli Studi di Napoli "Federico II"
Dipartimento o Struttura:Ingegneria Biomedica, Elettronica e delle Telecomunicazioni
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Scuola di dottorato:Ingegneria dell'Informazione
Denominazione del dottorato:Ingegneria Elettronica e delle Telecomunicazioni
Ciclo di dottorato:XXI
Numero di sistema:3318
Depositato il:13 Novembre 2009 13:53
Ultima modifica:13 Novembre 2009 13:53

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