| One research topic is to study the deployment of wireless sensor networks (WSNs). Usually the data is transmitted to the base station by a multihop method. However, multihop transmission makes the sensors close to the BS consume more energy than other far away nodes because of packets to be relayed to the BS. Once closeby nodes use up their energy, data from far away nodes can not be transmitted to the BS directly and the network performance is heavily affected.;In this dissertation, we study different deployment strategies for WSNs. We introduce the use of some redundant nodes so that the lifetime of WSNs could be prolonged. Nonuniform deployment of WSNs is also discussed. The main idea is to deploy more nodes close to the BS so as to balance the energy consumption among all sensors. Three kinds of deployment strategies (deterministic deployment, partially controlled deployment and distribution controlled deployment) are studied. We also provide a data collection protocol design to support the nonuniform deployment architecture. A real wireless sensor system has been developed. We also explore the future research directions related with WSN deployment strategies. |
