TDMA protocols have attracted a lot of attention for underwater acoustic sensor networks (UWSNs). because of the unique characteristics of acoustic signal propagation such as great energy consumption in transmission. long propagation delay and long communication range. Previous TDMA protocols all allocated transmission time to nodes based on discrete time slots. https://www.roneverhart.com/HP-15-fc0093dx-15-6-FHD-Laptop-AMD-Ryzen-5-7520U-2-8-GHz-AMD-Radeon-16GB-LPDDR5-256GB-SSD-Windows-11-Home-S-8F1A6UA/