the whole network field divided into 2 levels.These levels are homogenous in terms of initial energy of node. Usually BS is placed in the center of the network.The formation of levels requires the distance from the BS has the distance Dmax. Levels are defined on the basic of the Dmax. the nodes which have greater distance than the (Dmax/2) are in level 2 and the other nodes are in level 1 Since it is a 100m x 100x network so the maximum distance from the BS to the nodes can be 70m.