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In this paper, we concentrate on a dense, multi-hop, heavy-traffic, delay-tolerant Underwater Acoustic Sensor Networks (UASNs), proposed a distributed, high-throughput, energy-efficient media access control (MAC) protocol, abbreviated as the COPESM-MAC protocol. The basic idea of proposed MAC protocol is combining "parallel reservation" with "sleep mode" to achieve a higher channel utilization and a better energy efficiency. We briefly present and evaluate the proposed protocol through several simulations which show that COPESM-MAC outperforms COPE-MAC and UWAN-MAC in terms of system throughput and energy efficiency in a dense deployed, high traffic load UASNs.
Xia et al. (Sat,) studied this question.