Node

CH

Explication

x

u

Node x selects u as CH because it has the lowest metric from its neighborhood. Therefore x becomes a simple node.

z

z

Node z has no more neighbors therefore it stays CH.

u

u

Node u becomes CH because it has the lowest metric from its neighborhood.

t

u

Node t changes its state from CH to a simple node because no node chooses t as cluster head and node u has the lowest metric from its neighborhood