一种并行传输的水声Ad hoc网络多址接入(PTMA)协议  

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

作　　者：高明生[1] 陆佶人[1] 姜卫东[1] ZHANG Hong-tao 

机构地区：[1]东南大学无线电工程系,江苏,南京,210096

出　　处：《电子学报》2005年第7期1271-1274,共4页Acta Electronica Sinica

基　　金：国家"十五"预研项目(No.10106050303)

摘　　要：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 presence of the ＂hidden terminal＂ and the ＂exposed terminal＂ probleme, the apphcations 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 （PrMA） 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 PrMA protocol can provide higher throughput performance and lower end-to-end propagation delay than those that are suitable for radio Ad hoe networks within the underwater acoustic environment.

关 键 词：AD hoe网络 水声信道 多址接入控制 并行传输 

分 类 号：TN914.41[电子电信—通信与信息系统]