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Research on Position-based Routing Protocol in Wireless Sensor Network

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Tutor: GaoHang
School: Nanjing University of Aeronautics and Astronautics
Course: Applied Computer Technology
Keywords: Wireless Sensor Network,routing protocol,communication void,optimum transmission
CLC: TN915.04
Type: Master's thesis
Year:  2009
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Geographic routing has been widely considered as the most promising approach to wireless routing for wireless sensor network (WSN). This thesis analyses the communication void handling technique and strategy of next forwarding node adopted by position-based routing protocols, improves two currently proposed position-based routing protocols, and designs high energy-efficiency position-based protocol for wireless sensor network.The communication void handling technique in this thesis is face traversing. Currently proposed face traversing techniques rely on idealized assumption about nodes¡¯radio shape: Unit Disk Graph. The existing of obstacles in realistic physical environment causes extreme irregularity of sensor nodes¡¯radio shape, which leads to violation of the idealized assumption. The proposed protocol of this thesis no more makes idealized assumption about radio shape, and some obstacles are put into the simulation environment to emulate the real physical environment. The face traversing in this thesis adopts the mechanism that switches the rotating direction, which could make the chosen routing path closer to the optimum path. Sensor node begins to run planar graph algorithm locally when it enters face traversing mode, not in the whole network region. This strategy increases some latency, but decreases the nodes¡¯energy consumption, and makes every node get its real-time neighborhood information.The currently proposed selection strategies of next forwarding node all consume too much energy for one hop transmission. This thesis designs a novel forwarding approach, which is based on the research on optimum transmission range. It increases the energy use ratio, decreases nodes¡¯energy consumption, and thereafter prolongs the network lifetime.
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