Ankara : The Department of Computer Engineering and the Institute of Engineering and Science of Bilkent University, 2010.Thesis (Master's) -- Bilkent University, 2010.Includes bibliographical references leaves 64-66.In recent years, the interest in wireless sensor networks has grown and resulted
in the integration of low-power wireless technologies with cameras and microphones
enabling video and audio transport through a sensor network besides
transporting low-rate environmental measurement-data. These sensor networks
are called wireless multimedia sensor networks (WMSN) and are still constrained
in terms of battery, memory and achievable data rate. Hence, delivering multimedia
content in such an environment has become a new research challenge.
Depending on the application, content may need to be delivered to a single destination
(unicast) or multiple destinations (multicast). In this work, we consider
the problem of e ciently and e ectively delivering a multimedia stream to multiple
destinations, i.e. the multimedia multicasting problem, in wireless sensor
networks. Existing multicasting solutions for wireless sensor networks provide
energy e ciency for low-bandwidth and delay-tolerant data. The aim of this
work is to provide a framework that will enable multicasting of relatively highrate
and long-durational multimedia streams while trying to meet the desired
quality-of-service requirements. To provide the desired bandwidth to a multicast
stream, our framework tries to discover, select and use multicasting paths that go
through uncongested nodes and in this way have enough bandwidth, while also
considering energy e ciency in the sensor network. As part of our framework,
we propose a multicasting scheme, with both a centralized and distributed version,
that can form energy-e cient multicast trees with enough bandwidth. We
evaluated the performance of our proposed scheme via simulations and observed
that our scheme can e ectively construct such multicast trees.Yargıçoğlu, BurcuM.S