Reaserch On Topology Control And Key Management For Wireless Sensor Networks

Wireless Sensor Networks (WSNs) is a new generation of sensor networks,with a very wide range of applications. The key Techniques of WSNs have attracted the attentions of researchers at home and abroad. Aiming at the key techniques of WSNs, such as topology control and security issues, this paper researched topology control and authentication mechanisms in WSNs.The main contents discussed in this thesis are as follows. The paper studied the typical topology control mechanisms in WSNs, such as the algorithm combined with routing protocol, the algorithm based on the node degree, the algorithm based on the direction, hierarchical and non- hierarchical sleeping scheduling algorithm and so on. The paper proposed WoED clustering algorithm based on energy and node degree, and presented algorithms about topology control and maintenance. The energy consumption was analyzed. The paper studied the PKI, Threshold technology, elliptic curves cryptology, and other sensor network security-related knowledge and certification agreement. The pre-shared key model, random key pre-distribution model, as well as other security guide model, were studied. On the basis of the CGSR protocol, an improved routing algorithm CGSR-M was designed, which can be used to communicate between cluster heads in key management. The paper studied the signature scheme based on Elliptic Curve, and designed the operational procedures of key distribution, updating, and certificate services, designed and preliminarily realized the Key Management Based on Clustering system. The performance of the prototype system was tested.According to the specific application environments, the presented WoED clustering algorithm can adjust the trend of election cluster heads by changing the value expression. The flexibility of the WoED algorithm made it able to meet different application needs. Simulation results showed that the algorithm WoED algorithm had better robustness, compared with the largest node degree algorithm and the smallest node ID algorithm.