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Studies on MAC protocols of the Underwater Acoustic Sensor Network (UASN) are very important due to wide application area and great application potential of UASN. In this paper, a new concurrent bidirectional MAC protocol based on receiver self-adaption (RABIC-MAC) is proposed to improve the data transmission efficiency and reduce the overhead. Then the throughput and the End-to-End delay are calculated, and then compared with the BIC protocol. Results show that the saturated throughput is larger 16.7 % and 33.0 % for 4200 and 6125 m, respectively, than the BIC. The saturated End-to-End delay is larger 13.0 % and 20.0 % for 4200 and 6125 m, respectively, than the BIC. Therefore, the RABIC-MAC evidently improves performances of UASN.

A new MAC protocol of UASN (RABIC-MAC) based on high efficiency, concurrent and bidirection