The reception success rate: EASO-TDMA has a 15%% higher reception success rate than ASO-TDMA on average.
The collision rate: The performance pattern of the collision rate is opposite to that of the reception success rate.
The reception success rate of the two MAC protocols decreases as the number of active ships increases.
Accordingly, it is expected that EASO-TDMA can outperform ASO-TDMA in terms of the reception success rate, collision rate, end-to-end delay, and channel utilization.
The performance parameters considered are the reception success rate (RSR), the collision rate (CR), the end-to-end delay (E2ED), and the channel utilization (CU).
On the other hand, the reception success rate first decreases and then bottoms out with increasing number of packets generated per hyperframe.
When the signal-to-noise ratio is larger and the rate of success receiving data is larger, even if the sender transmit power is greatly increased, the reception success rate of the receiver also increased little.
We assume that the control signals, i.e., acknowledgements (ACKs) and negative acknowledgements (NACKs), indicating reception success and failure of the corresponding packets, respectively, can be reliably received by intended receivers.
The simulation results indicate that EASO-TDMA outperforms ASO-TDMA, regardless of the network conditions, with 25%% higher reception success rate, 25%% lower collision rate, and 21%% higher channel utilization at maximum.
This implies that the reception success rate mainly depends on the number of active nodes, which increases the possibility of receiver collisions among hidden ships by allocating the same time slots.
