earticle

영어

In hierarchical routing in Wireless Sensor Networks, the nodes are divided into clusters. In each cluster, one node is selected as cluster head and other nodes are cluster members. Till now, different mechanisms have been proposed for communication between cluster members and cluster head in hierarchical protocols. Most of them determine a same time for each cluster member to communicate with cluster head without regarding the nodes conditions. In this paper, we propose a novel scheduling mechanism inspired of Artificial Immune System algorithm called CHSM. In this mechanism, the nodes with more information have a better chance for communicating with cluster head. Then, we propose QoS-CHSM mechanism and improve the proper nodes distribution in each cluster. In this method, we try to apply a more proper distribution of nodes in the cluster, by changing cluster to the virtual sub clusters and applying the CHSM for each virtual cluster separately. In fact, the CHSM is a special manner of QoS-CHSM in which the number of virtual clusters equals one. We have simulated LEACH protocol and used proposed scheduling mechanisms in it and then compared it with original LEACH protocol which uses TDMA scheduling mechanism. The results of simulation show the effectiveness of the proposed mechanisms.