| Recent advances in MEMS (micro-elect mechanical systems), processor, radio, and memory technologies have dramatically promoted development of wireless sensor networks. During recent years, research in wireless sensor networks has become more and more active. Network protocols developed for sensor networks are of great importance to meet specific design goals of sensor networks. In this dissertation, the issues of the routing protocols of wireless sensor network are discussed. We design a distance cost energy efficient protocol (DCEP) for minimizing energy consumption in sensor networks. There are two main contributions of this work.The first contribution is the design of distance cost energy efficient routing protocol. Energy efficiency is a dominant consideration in deciding the routing technique of sensor networks. Meanwhile, the load balance of wireless sensor networks is very important for sensor networks. In DCEP, every node gets the information of each neighbor node when interest packet is broadcasting. The neighbor information of each node includes an attribute which expresses the minimum distance to base node. According to the distance to the base and the left energy of the neighbor node, a node will select the next hop node which will transmit data information.The second contribution is the design of timer-based algorithm (TBA) for solving fault recovery. Each node sets a timer for each neighbor node, which records the time of the information updating. If a node has not receive information of some neighbor node for a regular time interval, it will add the value of timer. The probability of the neighbor node as next hop will be reduced drastically. In this way, each sensor node can have the ability of foreseeing the fault node.At last, the DCEP protocol is simulated on Network Simulator (OPNET). Simulations show that compared with DD and GPSR ,DCEP prolongs the network lifetime is much larger than and it enables the expansion of the network better. |
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