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Figure 9. The throughput comparison in a two-hop scenario
used by H-MAC is fixed to 3 channels, and the
channel capacity is set to 1Mbps.
The Figure 11 shows the simulation results.
We varied the number of contending node and we
measured the aggregate data throughput. H-MAC
obtains its highest performance in this simula-
tion. With a number of sending nodes equal to
5, H-MAC achieves a data throughput of 2.282
Mbps than 1.251 Mbps achieved by Z-MAC.
The throughput increases progressively with the
number of sending nodes, and it can reach 3.431
Mbps with the number of sending nodes equal to
21. However, Z-MAC does not have any improve-
ment in the data throughput, which stays stable
Figure 10. multi-hop network scenario
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