利用相对时钟实现水声通信网络时分复用  

A relative clock based TDMA protocol for underwater acoustic communication networks

作　　者：章佳荣 乔钢 

机构地区：[1]哈尔滨工程大学水声技术重点实验室,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2014年第1期109-114,共6页Journal of Harbin Engineering University

基　　金：国家863计划基金资助项目(2009AA093601-2);国家自然科学基金资助项目(11274079)

摘　　要：针对水声通信网络全局时钟同步困难、周期广播同步信号效率低的问题,以集中式网络为研究对象,设计了一种基于相对时钟的TDMA协议。主节点在初始化过程中获取与各子节点的传播时延,根据时延值交错布置各子节点的工作时间并将时间表广播给网络中的所有子节点,各子节点将网络时间表映射到本地时间轴上进行工作,并在数据传输过程中完成时间表的修正,不需要全网时钟的严格同步。分析了工作周期、网络负载等因素对协议性能的影响,并进行了软件仿真与实验验证,结果表明该协议与传统的CSMA协议相比,能有效降低握手和数据冲突占用的时间及消耗能量。It is difficult to achieve global clock synchronization for underwater acoustic communication networks, and periodically broadcasting the synchronizing signals is low in efficiency. To address these problems, a relative clock based time division multiple access （RTC- TDMA） protocol was designed for the centralized networks. With this protocol, strict global clock synchronization is not needed. The working schedule was arranged alternately by the main node according to the propagation delays of the different sub nodes in relation to the main node, which were acquired during the initial stage. This schedule was mapped to every node＇s local time line respectively, and was modified during the data transmission process. The effects of the work duration, net load, etc., on the RTCTDMA protocol performance were analyzed and the simulations were carried out, as well as the experiments. The results show that this protocol can efficiently reduce the time and energy consumption caused by the handshaking and data collisions as compared to the carrier sense multiple access （CSMA） protocol.

关 键 词：相对时钟 TDMA协议 集中式网络 水声通信网络 

分 类 号：TN929.3[电子电信—通信与信息系统]