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A-MACAdaptive Media Access Control
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If the linkbetween the communicating parties is established, then constraint (13d) defines that the total flow of traffic is always less than the data generated by nodes because the protocol operation of A-MAC does not allow nodes to transmit normal data while sensing.
[[tau].sub.rms] model for our proposed A-MAC based on the measurements.
This section provides a brief description related to MATLAB simulations of the proposed A-MAC protocol as well as IEEE 802.15.4 and AR-MAC.
From Figure 7 it is clear that A-MAC performs better than IEEE 802.15.4 and AR-MAC.
A-MAC shows extension in the network lifetime as compared to the given counterpart protocols, as can be seen from Figure 8.
However, witnessing A-MAC's curve in Figure 9 really grabs the attention.
According to Figure 10 packets dropped order is IEEE 802.15.4 > AR-MAC > A-MAC. Reasons are as follows: CSMA/CA and fixed guard band assignment in IEEE 802.15.4 means high contention leading to more packets being dropped, adaptive guard band assignment in AR-MAC means relatively low contention leading to less number of packets being dropped, and adaptive guard band assignment as well as minimizing the number of transmissions means minimizing the contention for channel access thereby further decreasing the number of packets being dropped.
A-MAC. A-MAC is one of the receiver-initiated LPL protocols, like RI-MAC.
First, in terms of data aggregation time, without regarding wake-up source type, while adaptive and schedule-based protocols such as WISE-MAC and MX-MAC show fast data aggregation time, preamble-based or receiver-initiated protocols like B-MAC, RI-MAC, and A-MAC present long aggregation times.
The guaranteed network lifetime of A-MAC is greater than the proposed scheme and is equal to its maximum network lifetime T = 600 ms, where all nodes are near to drain out their energies.
Under the same condition, Figure 6 plots the ratio of alive and working nodes in the proposed and A-MAC protocols as time goes on.
Figure 7 further shows time to first node death to analyze guaranteed lifetime with respect to the routing metric in proposed and A-MAC protocols.