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目的:针对水声信道特点,设计适用于水下环境的高效节能的水声通信网络MAC层协议。创新点:在传统slotted-FAMA协议基础上,引入RTS竞争机制,克服多RTS尝试问题,大幅度提高网络吞吐量并降低网络能耗。方法:首先,讨论水声通信网络slotted-FAMA协议存在的多RTS尝试问题。指出该问题严重制约了网络性能。然后,提出克服该问题的方法,提出新的MAC协议,RC-SFAMA(图3)。该协议在RTS/CTS握手环节中引入RTS竞争机制。当多RTS尝试问题发生时,各节点利用RTS数据包中的C-number进行RTS竞争来争夺信道使用权。竞争获胜的节点可以继续进行有效数据的传输而失败节点则推迟其数据传输以避免冲突产生。通过竞争机制,当多RTS尝试问题发生时,仍有有效数据得以传输并不会造成冲突,从而克服了这一问题,实现网络吞吐量大幅度提高以及网络能耗的降低。结论:针对slotted-FAMA存在多RTS尝试问题,提出解决办法,提高网络吞吐量并降低网络能耗。
Objective: To design an efficient and energy-saving MAC protocol for underwater acoustic communication network, which is suitable for underwater environment. Innovation: Based on the traditional slotted-FAMA protocol, the RTS competition mechanism is introduced to overcome the multi-RTS attempt problem, greatly improve network throughput and reduce network energy consumption. Methods: First, we discuss the multi-RTS attempt of slotted-FAMA protocol in underwater acoustic communication network. Pointed out that the problem seriously hampered the network performance. Then, propose a way to overcome this problem, put forward a new MAC protocol, RC-SFAMA (Figure 3). This agreement introduces RTS competition mechanism in RTS / CTS handshake link. When multiple RTS attempts occur, each node contends for RTS by using the C-number in the RTS packet to contend for channel usage. The node that has won the competition can continue the transmission of the valid data but the failed node delays the data transmission to avoid the conflict. Through the competition mechanism, when multiple RTS attempts occur, effective data can still be transmitted without causing conflicts, thus overcoming this problem, improving network throughput and reducing network energy consumption. Conclusion: There are many RTS attempts for slotted-FAMA, propose solutions to improve network throughput and reduce network energy consumption.