“…2,4,5,7,[17][18][19][20]22,25,26 However, there is a large volume of published works that ignore to model propagation mechanisms of underwater environment at the physical layer (eg, previous research [13][14][15][16]21,23,24,27,28 ). Moreover, frequent packet drops are considered in some works 2,7,16,17,19,20,22,25 but assumed to be neglected in many of the works (eg, other studies 4,5,[13][14][15]18,21,23,24,[26][27][28] ). There are only a few works that incorporate either retransmission or PDR thresholds for a reliable communication performance 15,17,20,22,25 in delay constrained UASNs.…”