“…The routing protocols designed for WSN can be classified based on path selection, as proactive (Daniel et al, 2005), reactive (Wang et al, 2005) and hybrid (Muruganathan and Fapojuwo, 2008). Based on the network architecture, they can be further classified as flat (data-centric, flooding) (Intanagonwiwat et al, 2000;Kulik et al, 2002 andYe et al, 2001), hierarchical, such as LEECH (Heinzelman et al, 2000), TEEN (Manjeshwar and Agarwal, 2001) and APTEEN (Manjeshwar and Agarwal, 2006), and geographical informationbased, such as GAF (Xu et al, 2001) and GEAR (Yu et al, 2001).…”