电子学报 ›› 2005, Vol. 33 ›› Issue (7): 1271-1274.

• 论文 • 上一篇    下一篇

一种并行传输的水声Ad hoc网络多址接入(PTMA)协议

高明生, 陆佶人, 姜卫东   

  1. 东南大学无线电工程系,江苏南京 210096
  • 收稿日期:2004-08-30 修回日期:2005-05-24 出版日期:2005-07-25 发布日期:2005-07-25

A Parallel Transmission Multiple Access (PTMA) Protocol for Underwater Acoustic Ad hoc Networks

GAO Ming-sheng, LU Ji-ren, JIANG Wei-dong, ZHANG Hong-tao   

  1. Department of Radio Engineering,Southeast University,Nanjing 210096,China
  • Received:2004-08-30 Revised:2005-05-24 Online:2005-07-25 Published:2005-07-25

摘要: 由于存在"隐藏终端"和"暴露终端"的问题,无线Ad hoc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Ad hoc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OPNET Modeler/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Ad hoc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.

关键词: Ad hoc网络, 水声信道, 多址接入控制, 并行传输

Abstract: Due to the presence of the "hidden terminal" and the "exposed terminal" problems,the applications for radio Ad hoc networks have greatly been restricted.Furthermore,with the characteristics of the underwater acoustic channel,such as low available bandwidth,highly varying multipath,and large propagation delays,the designing of underwater acoustic Ad hoc networks is a more challenging task.In this paper,we propose a new multiple access control (MAC) protocol for underwater acoustic Ad hoc networks,namely,the parallel transmission multiple access (PTMA) protocol.This protocol is based on the following ideas:to resolve collision,the reservation for multiple channels is made,thus data packets may parallelly be transimitted on multiple channels;to reduce the time for waiting for the clear-to-send (CTS) packets,we begin to transmit data packets as soon as the request-to-send (RTS) packets have been sent without the receipt of the CTS packets.Simulation results,which were obtained by using the OPNET Modeler/Radio,show that the proposed PTMA protocol can provide higher throughput performance and lower end-to-end propagation delay than those that are suitable for radio Ad hoc networks within the underwater acoustic environment.

Key words: Ad hoc networks, underwater acoustic channel, multiple access control, parallel transmission

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