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Research On Mobility Pattern Of Mobile Sinks In Wireless Sensor Networks

Posted on:2015-12-28Degree:MasterType:Thesis
Country:ChinaCandidate:J XuFull Text:PDF
GTID:2298330467463061Subject:Electronic Science and Technology
Abstract/Summary:PDF Full Text Request
Because of its great value in industry, agriculture, military and environmental monitoring, Wireless Sensor Networks (WSNs) draw great attention from worldwide researchers. In traditional WSNs, sink and sensor nodes are statically deployed in the sensing area, and data packets are forwarded from the source node to the sink by multi-hops. In this communication mode, those nodes around the sink need to more forward data packets to the sink for other nodes and then become hot-spots in the network. So, energy consumption in these hot-spots is much faster than that in other nodes, and when these hot-spots’energy are exhausted, the network will have to stop work. This situation in WSNs is called the "Energy Hole" problem. The "Energy Hole" problem severely affects the network performance of WSNs, and thus impacts the further development of WSNs. To address the "Energy Hole" problem, mobile sinks are introduced to WSNs. In Mobile Sink Wireless Sensor Networks (MSWSNs), sinks are no longer statically deployed, they periodically move in the sensing area. Those sensor nodes around the mobile sinks are ever-changing in the network, so the "Energy Hole" problem can be effectively resolved. In addition, mobile sinks also can balance the network load and improve the efficiency of data delivering. In all, introducing mobile sinks to WSNs bring great improvement on the network performance of WSNs, and thus promote further development of WSNs.However, introducing mobile sinks also brings a new problem:when the mobile sinks periodically move in the sensing area, the network topology is also continuously changed. So, the mobile sinks need to periodically broadcast their new location information to the whole sensor nodes for network connectivity. This location update procedure brings unexpected communication overhead, and when mobile sinks continuously change their places in the network, this location update process not only consumes much energy of sensor nodes but also leads to severe congestion.In this paper, a square based local location update protocol is proposed to reduce the energy consumption of location update. When the mobile sink only moves inside one square, location update will be confined inside the square. Only when the mobile sink needs to move out of current square, location update process will be conducted in the whole network. The sink’s mobility pattern is controlled in our protocol, which could optimize the frequencies of local location update and the whole network location update. In addition, the controlled sink mobility can also intelligently adjust the distance between the source and the sink and balance the network load in the sensing area, which would effectively prolong the network lifetime.
Keywords/Search Tags:wireless sensor networks, mobile sinks, mobilitypattern, location update protocols, local location update, network lifetime
PDF Full Text Request
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