Research On Directed Wireless Sensor Networks Topology Control Baced On Energy Balance

Wireless sensor networks are self-organized networks with limited energy.They are usually deployed in remote areas which people generally can not reach.The sensor nodes become failure due to the imbalanced energy consumption or attacks based on key nodes.The failure nodes may lead to cascading failures,which seriously affect the network performance and become the bottleneck of large-scale application of resource limited networks.Therefore,it is of great practical significance for the research on directe wireless sensor networks topology control baced on energy balance.The specific research contents in this paper are as follows:In wireless sensor networks,data is always transmitted to the base station in the actual transmission process.The distance of node to the base station is different,which leads to the energy consumption of network imbalanced.First,the directional property is introduced into the topology construction and the reasons for the imbalanced energy consumption of nodes are analyzed.The network become hierarchical according to the hop of node to the base station.Then the relationship model of energy and level is established.Combined with the scale-free theory,the optimal probability of the node sending and receiving degree are established by using the node sending and receiving energy,and an energy consumption balanced directional scale-free topology of WSNs is obtained.On the basis of the energy consumption balanced directional scale-free topology of WSNs,the difference of cascading failure process between directed network topology and undirected network topology is analyzed.Considering the node in-degree,neighbor-node in-degrees and node layers,the initial node load and energy model is built.The hierarchical heterogeneity is taken into account for load redistribution after node failure so that the additional load is allocated to the higher or same layer nodes.Then the relationship between network parameters and network robustness is obtained from the analyses of network cascading failure.In order to solve the problem that the failure of key nodes can cause cascadingfailure,which seriously affects the performance of the network.On the basis of the directed network topology cascading failure model,the node energy and load oscillation extent caused by node failure is derived.Then the derived cascading failure oscillation extent is combined with the improved PageRank algorithm and the key node decision algorithm of WSNs based on the cascading failure is proposed.Finally,the effectiveness of the key node decision algorithm is verified by Matlab simulation.In order to shorten the gap between the simulation experiment and the actual operation of WSNs,the specific experiment scheme and internal networking rules of WSN based on GAINZ experimental platform are proposed.On the experimental platform,the theoretical research network topology is built by using the Programmers Notepad,serial debugging tools and WinAVR.Finally,the built network topology performance in real environment is analyzed by PowerTOSSIM and SNAMP.