First we compare the results between SA scheme and Lingo
tools to demonstrate that the result derived by SA is also the
global optimal solution, as Fig. 9 shows.
When consider the data aggregation, three sensors ordering
for slot assignment, called random, input degree, and hop
counts, are compared in Fig. 10. As the Fig. 10 shows, the
random method has the shortest frame length represented by
number of slots. Except to the 30 nodes topology, the input
degree method has the same results with random method.
Once consider the sensing data collection time, the input
degree method and hop count method require only one frame
time to collect all of sensing data, as Fig. 11 illustrates. The
comparison in sensing data collection time is depicted in Fig.
12. The results show that the input degree method has great
results than other two methods.