DDAN: A distributed directory for ambient networks / DDAN: A distributed directory for ambient networks

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Ambient Networks (AN) were designed with the goal of establishing the interoperability between different types of networks. This interoperability aims to attend the services requested by users, independently of their current location, type of network and access technology. The Project is motivated by futuristic scenarios which make the technology more and more present in peopleâs daily routines, since they can benefit from the services offered. The main concepts involved in ambient networks are Heterogeneity, Mobility and Composition. Basically, three phases are considered in a typical cooperation process involving ambient networks: advertisement, negotiation and composition. The first one considers the offering of information and services among AN. In the negotiation phase, the goal is that a network might attend the other oneâs needs for services and/or information, and in order to achieve this, it is necessary to establish composition agreements among them. The composition phase is performed as soon as the negotiation phase is successfully completed. Composition is the realization of the Composition Agreement (CA), which results from negotiations between networks and/or users and establishes rules and policies to be accomplished by entities where cooperation exists between them. The AN project emphasizes the composition phase more than the other phases. On the other hand, the advertisement phase, the discovery of services and networks is considered an âautomaticâ approach. In addition the advertisement phase is focused on the discovery between networks, through signaling for instance, where one network âfeelsâ the presence of another. However, a more elaborate structure for searching and updating information on a global basis in a dymanic directory has not been defined yet. Information about each ambient network such as existing users, network features and mainly offered services is not considered yet in a global context. Therefore, this work proposes a global distributed directory service to AN (DDAN), where AN can register their global information and the other networks can use this directory service to retrieve information such related to services, resources and other information of AN, using flexible queries. This information will be represented in accordance with a global information model, proposed in this work, but it can be extended as long as new global resources appear and need to be represented. In addition, DDAN was designed to accomplish the AN concepts and requirements and in order to act in an AN environment. Performance analysis and validation showed that DDAN is suitable for the purpose that it was designed for, presenting a expected behavior and positive results according to the metrics established

ASSUNTO(S)

ciencia da computacao storage of information flexible queries flexible queries storage of information distributed directory ambient networks environment distributed directory ambient networks environment

ACESSO AO ARTIGO

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