“…Some of these solutions applying duty cycle mechanism (switching to sleep mode periodically) to reduce energy consumption since sensor nodes consume less energy in sleep mode. In traditional WSN, such a mechanism is widely adopted to conserve energy (Chao and Lee, 2012;Ye et al, author (Azar and Manzuri, 2010;Guo et al, 2009;Molins and Stojanovic, 2006;Ng et al, 2010;Park and Rodoplu, 2007;Syed, Ye, et al, 2007;Syed et al, 2008;Yang et al, 2011) (Chen and Wang, 2007;Cho et al, 2011;Diamant et al, 2011;Hong et al, 2008;Ma et al, 2009) multichannel (Chao and Wang, 2012;Chao and Lu, 2011) 2004); however, in UWSN, we do not find many protocols adopt this duty cycle mechanism yet. UWAN-MAC (Park and Rodoplu, 2007) and the one proposed by Azar et al (Azar and Manzuri, 2010) are two solutions that have applied duty cycle mechanism for power saving.…”