Because the cluster head will perform the additional task of data aggregation it will dissipate more energy and if it will remain the Cluster head permanently then it will die quickly. LEACH will face this problem by randomly rotating cluster head to save the battery of individual node.
Each node uses a particular algorithm at each round to decide whether to become a cluster head or not. In order to become a cluster head, that node should have higher energy level than others. Thus the ultimate goal of LEACH protocol is to increase the lifetime of whole system by selecting cluster head among more powerful sensor network. The process of implementation of LEACH includes many rounds.
Each round contains two phase a) cluster set-up phase b) steady …show more content…
After this each elected CH node will send a broadcast message advertizing all nodes. After this member nodes will decide to which it will belong depending upon the signal strength and distance for the current round.
• Joining phase: Once the cluster head has been selected , all the nodes join the corresponding cluster by sending a message to CH informing that it will be a member of that cluster
• Schedule creation: CH will receive all the messages from the nodes that would like to be in its cluster. Once the cluster head knows the no. of nodes in that cluster it will generate a TDMA schedule such that only one node will transmit in each time slot. After this CH will broadcast the schedule to its member nodes of cluster. At this point the set-up phase is completed and network will enter into a steady state phase
b) STEADY PHASE: the steady phase is divided into slots, all the nodes sends their data to the cluster head atmost once per frame during their allotted TDMA time schedule. When all the data has been received then cluster head will do the data aggregation and compression and transmit it to the base station. When the base station receives all the data aggregated from the CH, CH sends the message to all member nodes to start a new