Research On Routing Protocol In Wireless Sensor Network

Wireless sensor network(WSN) is one hot research area.WSN integrates the theories of wireless communication,sensing,embed technologies and microelectronic manufacture.The sensor nodes can monitor and collect the environment information.By composing the multihop and self-organization routing,the nodes can send the sample data in monitor area back to the sink node.The WSN has a wide range of potential applications in military and civil areas.Both academia and industries pay a great attention in it.This dissertation carries out the research work in the design of routing protocol in WSN and focuses on the combination of theory and practice.The proposed routing alogrithms are evaluated by the simulation and parts of them are installed in the self-developed node named S-Mote for pratical test.The widely used routing protocols in WSN application on the TinyOS is disucssed in this dissertation.These routings is typically cost-based which will cause load imbalance,but the issue has carried little research work in the route design on the TinyOS by far.This dissertation presents and implements the MintRoute-HNLB and SLNC-MHop routing protocols on the TinyOS operation system for the condition of the constant and differences data flow respectively. The hot notifing and the hot node avoidance strategy are introduced in the MintRout-HNLB to distribution of the traffic loads in the network by choosing the suboptimal node sharing the forwarding task of the hot node.In the SLNC-MHop protocol,the load balancing strategy was taken into consideration based on cost-based routing algorithm.Compared with the average of the load of same level nodes in the observing time interval to decide wheather a node is overload or not.The overload notify is sended by overload node and the same level node which has the lowest load helps to relay the data packets to balance the traffic load.The simulation results show that both of the proposed protocols are effective on load balancing.The protocols are also installed in the self-developed node named S-Mote for practical test that further verify the feasibility of the proposed algorithm.This dissertation research the on-demand protocol for the node-moving scene in WSN. The AODC-NCSD is proposed by taking into account of the reset energy and communication state of node and optimizes the route discovery and establishment process.The simulation results show that AODV-NCSD prolongs the network lifetime,improves the packet deliver radio and reduces the number of RREQ packets.In order to shorten the delay to reestablishment data transfer routing when the primary route broken,this dissertation proposes the AODV-WBR protocol that used the weight information to improve the backup node selection strategy and shorten the end-end delay metioned above.On the analysis of the HEED protocol as the research prototype,the joining cluster by optimal neighbor relay strategy is introduced in HEED-CHEE protocol to deal with "orphan node" and "isolated cluster head".The multihop routing among cluster heads is setup by taking into account the residual energy of the cluster head.The simulation results show that the HEED-CHEE protocol effectively saves the energy consumption of cluster head,protect the low energy cluster head and prolongs the network lifetime.For improving the iHEED clustering protocol that integrates the HEED alogrithm and multi-hop routing,the dissertation introduces and implementes the iHEED-CHLevel protocol on TinyOS.Based on combining of the HEED and multihop routing,the iHEED-CHLevel protocol used the strategy of clustering by node level and guarantees the cluster connectivity and the aggregated data reliable transfer.The dissertation research the application-related routing protocol based on the structure health monitoring system for a viaduct bridge based on the wireless sensor network.The S-Mote node used in the system is introduced.The application-related clustering multi-hop routing named MHop-CL is designed based on the nodes deployment information for the strain data monitoring.The MHop-CL routing alogrithms is not only evaluated by simultaion in theory,but also installed in the structure health monitoring system in a viaduct bridge for pratical test and provides a certain reference value for the application of the WSN.Finally,a summary has been done for all the proposed research contents.The innovative points are given.The research works in further study are presented.