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Publication
Data storage system for wireless sensor networks
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| 2.25 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Wireless sensor networks (WSNs) are starting to have a high impact on our
societies and, for next generation WSNs to become more integrated with the
Internet, researchers recently proposed to embed Internet Protocol (IP) v6
into such very constrained networks. Also, Constrained Application Protocol
(CoAP) and Observe have been proposed for RESTful services to be provided.
CoAP can be used not only between nodes on the same constrained network
but also with other nodes in the Internet. The latter is possible if CoAP is
translated to Hyper Text Transfer Protocol (HTTP).
With CoAP/Observe, a client may store notifications in it and use a stored
notification, as long as it is fresh, to serve other clients requesting it, without
contacting the origin server. However, the use of CoAP/Observe for clients to
be notified of resource changes, together with the possibility of incorporating
proxies, raise optimization issues when multiple requests for observation are
present in a network. These optimization issues involve registration steps,
energy saving, consistency and caching. Registration steps must be carefully
planned (which proxies to use), while keeping data consistency and timeliness,
so that energy is saved.
In this thesis, a careful planning of registration steps for data/notification
storage is proposed. That is a framework for the planning of such registration
steps, together with the aggregation and scheduling of notification deliveries
at proxies, so that energy saving is maximized, bandwidth is used efficiently
and the overall delay is reduced. This framework can be applied to different
types of applications. A heuristic approach is also proposed for solutions to be
obtained faster.
Description
Dissertação de mestrado, Engenharia Informática, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015
Keywords
Telecomunicações Redes de computadores Comunicação sem fios Wireless Internet Poupança de energia Agregação