Green Communication for Underwater Wireless Sensor Networks: Triangle Metric Based Multi-Layered Routing Protocol

. 2020 Dec 18;20(24):7278. doi: 10.3390/s20247278

Algorithm 1. Information Acquisition Phase.
1:	procedure $G e n e r a t e P r o b$ ( $S u p e r N o d e)$
2:	if $P r o b T i m e o u t$ is finished then
3:	Generate $P r o b P a c k e t$
4:	$A d d i d t o P r o b P a c k e t$
5:	$B r o a d c a s t$ ( $P r o b P a c k e t$ )
6:	$S e t$ $N e w T i m e o u t$
7:	end if
8:	end procedure
9:
10:	procedure $R e c e i v e P r o b$ ( $n o d e_{i}, P r o b P a c k e t$ )
11:	$A d d P r o b P a c k e t i n f o r m a t i o n t o n o d e_{i} . N I T$
12:	end procedure
13:
14:	procedure $G e n e r a t e H e l l o$ ( $n o d e_{i}$ )
15:	if $H e l l o T i m e o u t$ is finished then
16:	Generate $H e l l o P a c k e t$
17:	$A d d i d, d e p t h a n d r e s i d u a l e n e r g y t o h e l l o p a c k e t$
18:	$B r o a d c a s t$ ( $h e l l o p a c k e t$ )
19:	$S e t$ $N e w T i m e o u t$
20:	end if
21:	end procedure
22:
23:	procedure $R e c e i v e H e l l o$ ( $n o d e_{i}, h e l l o p a c k e t$ )
24:	if $\|n o d e_{i} . d e p t h\| > \|h e l l o p a c k e t . d e p t h\|$ then
25:	if $h e l l o p a c k e t I D$ is not in $n o d e_{i} . N I T$ then
26:	$A d d h e l l o p a c k e t i n f o r m a t i o n t o n o d e_{i} . N I T$
27:	else
28:	$U p d a t e i n f o r m a t i o n i n n o d e_{i} . N I T$
29:	end if
30:	Call TM ( $n o d e_{i}$ )
31:	else
32:	Drop ( $h e l l o p a c k e t$ )
33:	end if
34:	end procedure