Research On A Routing Algorithm For Distributing Energy Load Evenly In Wireless Microsensor Networks

Wireless Microsensor Network is a new type of sensor networks, it generally consists of many low-cost microsensors. The sensors that distributed in a given area and communicate with the others constitute a complicated wireless communication network system.Nowadays, it has a wide range of applications in plenty of areas. But this network has an obvious disadvantage:Due to the distributed feature and the tiny volume of nodes, most of microsensor nodes are powered by small cheap batteries and hard to supply. If some nodes in the network died early because of heavy load, the system lifetime would be affected directly. Therefore, it is important to develop a energy-efficient routing algorithm.L-DCHS protocol uses random election and cycle to control evenly the energy dissipation of the nodes, and prolongs the lifetime, but there still have some load-heavy nodes. For this problem, this paper adopt the theory of distributing energy load evenly, and do some groping research through improve the routing algorithm.The jobs focus on these aspects as follows:Firstly, the algorithm improves the logical structure of cluster for solve the problem of load-heavy cores. The functions of original core are distributed between data collection core and transmission core, and a corresponding method of electing core is proposed; Based on the new logical structure, improved algorithm prolongs the steady transmission phase; At the same time, this paper redefines a new candidate set. Secondly, a novel region division is proposed for the energy-dissipation difference between the near nodes and the far ones, and there is a strategy of defining the functions of cores based on region division.Matlab is used to simulate the system's energy-dissipation, and compare this improved algorithm with LEACH, L-DCHS. Simulations show that the improved algorithm can achieve a longer network system lifetime.