Since the underwater acoustic channel is known for limited bandwidth, time variation, and long propagation delays, the strategy to access the common communication medium is required to improve the performance of UASNs. This paper mainly investigates the application of underwater acoustic sensor networks (UASNs), which are characterized by large-scale, sparse distribution, and varying traffic loads. Simulation results have confirmed that the proposed protocol can achieve high throughput with low delay and good spatial fairness. To improve channel utilization, we present a variant Max-Min Ant System algorithm to calculate an optimal order for each data transmission round. The key idea of this mechanism is to utilize the information of propagation delay to adjust the time instant of control packets transmitting. We develop a control packets transmission adjustment mechanism to reduce collisions of control packets. Then an order list is calculated, and the data packets of these nodes are transmitted according to this order list. The nodes with data packets to be transmitted first reserve the channel in a channel reservation phase. #Mac too old to run handshaker macIn this paper, we propose a handshake based ordered scheduling MAC (HOSM) protocol for UA-LANs. Existing MAC protocols for terrestrial WLANs cannot be directly applied to UA-LANs due to the acoustic channel features of limited bandwidth and high and variable propagation delay. Media access control (MAC) is a crucial issue for UA-LANs. Underwater acoustic local area networks (UA-LANs) can be used to improve the coverage of an underwater network by introducing a tier of local area communications.
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