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由于存在“隐藏终端”和“暴露终端”的问题,无线Adhoc网络的应用受到极大的限制.进一步,由于水声信道的特点,例如有用的频率带宽很窄,强时变、多途和长传播时延,使得设计水声Adhoc网络具有自身特点和难度.本文中,我们为此提出了一种新的多址接入控制(MAC)协议,即并行传输多址接入(PTMA)协议.该协议基于如下思想:为消除冲突而进行多信道预约,这样能在多个信道上并行地传输数据;为缩短等待clear-to-send(CTS)的时间,当request-to-send(RTS)刚发送完就立即发送分组数据,而不必收到CTS后再发.通过使用OPNETModeler/Radio仿真器得到的仿真结果显示:PTMA协议能取得较之于适合无线Adhoc网络的多址接入协议更高的吞吐性能和较低的端到端传播时延.
Due to the problems of “hidden terminal” and “exposed terminal”, the application of wireless Adhoc network is greatly limited.Furthermore, due to the characteristics of underwater acoustic channel, such as useful frequency bandwidth is very narrow, strong time-varying, long distance and long In this paper, we propose a new multiple access control (MAC) protocol called Parallel Transport Multiple Access (PTMA) protocol. The protocol is based on the idea of multi-channel reservation for collision avoidance so that data can be transmitted in parallel on multiple channels; to reduce the time waiting for clear-to-send (CTS) Immediately after sending the packet data is sent, without having to receive the CTS and then send.Using the OPNETModeler / Radio simulator simulation results show that: PTMA protocol can be achieved compared to multiple access protocols for wireless Adhoc network higher Throughput performance and lower end-to-end propagation delay.