Design and Analysis of a Low Latency Deterministic Network MAC for Wireless Sensor Networks

. 2017 Sep 22;17(10):2185. doi: 10.3390/s17102185

Algorithm 2 New channel access mechanism

Require:
Number of sensor $N_{S}$ attached to the shared slot.
Ensure:
Transmission success/failure.
1:
if $S L O T_{S}$ and not $S L O T_{O}$ then
2:
locate backoff period boundary, and wait for $R_{b a c k o f f}$ periods;
3:
if ( $S L O T_{d u r a t i o n} - R_{b a c k o f f}) \leq (T_{C C A} + T_{L})$ then
4:
resume backoff at the next $S L O T_{S}$ ;
5:
else
6:
perform channel sensing as described in Algorithm 1;
7:
if channel access success then
8:
go to Step 14;
9:
else
10:
wait for next $S L O T_{S}$ ;
11:
end if
12:
end if
13:
else
14:
start transmission
15:
if transmission success then
16:
stop;
17:
else
18:
if $(S L O T_{R})$ available then
19:
start retransmission at the allotted $(S L O T_{R})$ ;
20:
else
21:
wait for next $S L O T_{S}$ ;
22:
end if
23:
end if
24:
end if