Graph coloring-based multichannel MAC protocol in distributed underwater acoustic sensor networks

In this paper, the multichannel medium access control (MAC) problem in distributed underwater acoustic sensor networks (UASNs) were investigated. Compared with single-channel MAC protocols terrestrial radio networks, there exist hidden terminal and long-delay protocol due to long propagation delay UASNs. addition, energy constraint makes channel allocation a challenging To solve these aforementioned problems, new protocol, called graph coloring-based (GCMAC) is present. The GCMAC synchronized which splits time into three phases, namely, negotiation phase, selecting phase data transmission phase. Specially, rule for carefully designed based on coloring theory avoid collision maximize utilization rate of channels Simulation results show that can greatly improve system throughput efficiency by effectively solving problems problem.