| Summary: | 碩士 === 國立交通大學 === 電機資訊國際學程 === 103 === Nodes participating in mobile ad-hoc networks have the liberty to join, leave and move across it, inducing the constant change in the topology and presenting a challenge for the composition and maintenance of the communication via between nodes. Considering the characteristics of different service discovery protocols proposed in the past years, the present work explores the development of a resource and service discovery protocol that makes use of the data type each node in the network handles, to create blocks related among them through an ontology. Concepts of ant colony optimization algorithms and infectious spread are applied to optimize the diffusion of message across the network, as well as to create the communication links between nodes starting search requests and nodes offering services in the network.
The methods used in the thesis include the study of different works as well as the classification of the same according to its design features, the application of these solutions to fit the characteristics of MANET networks, the development of the proposed resource and service discovery protocol validating its functionalities and proper response to the events occurring due to the dynamic nature of the network and the selection of an appropriate network simulation tool to reproduce and test the expected outcomes of the proposed protocol showing the advantages and limitations of the same. The efficiency and satisfactory performance of the proposed resource and service discovery protocol is presented in the different graphical comparisons and described in the corresponding subsections of the same. A significant decrease of the number of transmitted messages during the dissemination phase of the proposed protocol is found as compared to the amount of messages used when no data type relation is created or classified through an ontology. The results obtained when testing for the miss hit effect in the network show the high level of reliability of the protocol, producing constant outcomes of the number of services discovered in the network when the ratio of invalid services populating the network increases. Other results include the invalid search effect on system overload induced by the protocol, amount of search messages and effect on compatibility match process time.
The resource and service discovery protocol developed and fully implemented throughout the present thesis not only attains to the requirements and characteristics of MANET networks, but the results obtained through the simulations show the capability, functionality and advantages of its application in the development of more advanced processes such as automatic service composition making use of data type handled by different devices in a network.
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