Long propagation delay, limited bandwidth, and high bit error rate pose great challenges in media access control （MAC） protocol design for underwater acoustic networks. A MAC protocol called slotted floor acquisitio...Long propagation delay, limited bandwidth, and high bit error rate pose great challenges in media access control （MAC） protocol design for underwater acoustic networks. A MAC protocol called slotted floor acquisition multiple access （slotted-FAMA） suitable for underwater acoustic networks is proposed and analyzed. This FAMA based protocol adds a time slot mechanism to avoid DATA packet collisions. However, slotted-FAMA is not suitable for dense networks since the multiple request-to-send （RTS） attempts problem in dense networks is serious and greatly limits the network throughput. To overcome this drawback, this paper proposes a slotted-FAMA based MAC protocol for underwater acoustic networks, called RC-SFAMA. RC-SFAMA introduces an RTS competition mechanism to keep the network from high frequency of backoff caused by the multiple RTS attempts problem. Via the RTS competition mechanism, useful data transmission can be completed successfully when the situation of multiple RTS attempts occurs. Simulation results show that RC-SFAMA increases the network throughput efficiency as compared with slotted-FAMA, and minimizes the energy consumption.展开更多
基金supported by the National Natural Science Foundation of China(Nos.61374021,61222310,and 61328302)the Zhejiang Provincial Natural Science Foundation of China(No.LZ14F030003)+3 种基金the Specialized Research Fund for the Doctoral Program of Higher Education of China(Nos.20130101110109 and 20120101110115)the Zhejiang Provincial Science and Technology Planning Projects of China(No.2012C21044)the Marine Interdisciplinary Research Guiding Funds for Zhejiang University(No.2012HY009B)the Fundamental Research Funds for the Central Universities,China(No.2014XZZX003-12)
文摘Long propagation delay, limited bandwidth, and high bit error rate pose great challenges in media access control （MAC） protocol design for underwater acoustic networks. A MAC protocol called slotted floor acquisition multiple access （slotted-FAMA） suitable for underwater acoustic networks is proposed and analyzed. This FAMA based protocol adds a time slot mechanism to avoid DATA packet collisions. However, slotted-FAMA is not suitable for dense networks since the multiple request-to-send （RTS） attempts problem in dense networks is serious and greatly limits the network throughput. To overcome this drawback, this paper proposes a slotted-FAMA based MAC protocol for underwater acoustic networks, called RC-SFAMA. RC-SFAMA introduces an RTS competition mechanism to keep the network from high frequency of backoff caused by the multiple RTS attempts problem. Via the RTS competition mechanism, useful data transmission can be completed successfully when the situation of multiple RTS attempts occurs. Simulation results show that RC-SFAMA increases the network throughput efficiency as compared with slotted-FAMA, and minimizes the energy consumption.
