M Tech Dissertations

Permanent URI for this collectionhttp://drsr.daiict.ac.in/handle/123456789/3

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Subject: search.filters.subject.Ad-hoc sensor networks

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    Energy conserving voidless coverage in wireless ad-hoc sensor networks
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2005) Vege, Hari Kiran; Ranjan, Prabhat
    For many sensor network applications such as intrusion detection and military surveillance, it is necessary to provide full sensing coverage to a security-sensitive area while at the same time minimizing energy consumption and extending system lifetime by leveraging the redundant deployment of sensor nodes. It is also preferable for the sensor network to provide surveillance service for target areas with different degrees of security requirements. In this thesis, an established scheme that aims at adaptable energy-effect sensing coverage is analyzed. In this scheme, each node is able to decide a schedule for itself to guarantee a certain degree of coverage (DOC) with average energy consumption inversely proportional to the node density. An enhancement to this scheme is suggested. The validity of the proposed extension is proved though the simulations that address the issues of total energy consumption, balance of energy consumption, half-life of the network, coverage percentage over time, energy consumption for α coverage and actual degree of coverage. Comparisons are made with the two existing schemes namely ‘Adaptable Sensing Coverage Scheme’ and Sponsored Coverage Scheme’. These simulations show that the proposed scheme accomplishes α-coverage surveillance with low energy consumption. It outperforms other state-of –art schemes by as much as 50% reduction in energy consumption and as 130% increase in the half-life of the network.
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    Novel approach for localization in Ad-Hoc sensor networks
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2004) Desai, Vishal; Ranjan, Prabhat
    The ability of a sensor node to move itself or to otherwise influence its location will be critical in sensor networks. Today, the wireless community is putting great effort on the possibility of deploying thousands of tiny sensors all over the place and measuring all kinds of data within. Sensor network is a network of small devices, collaborating with each other to produce a larger sensing task. Most of the current literature on location discovery in wireless and sensor networks assumes the availability of GPS receivers at some nodes or beacon nodes with known position. But as we know having a GPS receiver at sensor nodes may not be feasible due to the limitations of satellite coverage inside the building or due to cost reasons. Further for ad hoc deployment of nodes, it is unreasonable to assume the presence of beacon nodes with prior position information. Hence, the main objective behind this research work is to introduce a localization/positioning method that would be GPS-free and beaconless, and finally we come up with a method called “LRT - Localization using Routing Table” which is also scalable, distributed and able to support the ad hoc deployment of large-scale sensor networks quickly and efficiently.