一种基于令牌的短波网动态TDMA协议设计与仿真  

Design and simulation of a dynamic TDMA protocol based on token for HF network

作　　者：周得敏 刘芸江[1] 李曼[1] 白翔[2] 

机构地区：[1]空军工程大学信息与导航学院,西安710077 [2]中电集团第三十研究所,成都610041

出　　处：《重庆邮电大学学报（自然科学版）》2015年第5期595-601,共7页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61302153)~~

摘　　要：针对短波天波通信数据传输可靠性低的特点,在TDMA(time division multiple address)协议基础上,时隙内部加入令牌机制,设计一种基于令牌的动态TDMA协议(TDMA protocol based on token,TP-TDMA),实现了时隙的动态利用,并克服了HFTP(high frequency token protocol)协议对令牌传递的依赖。提出了令牌发送算法(token send algorithm,TS-ALG)对各节点前一段时间内发送的数据量进行统计,并依据发送的先后顺序加权求和,以此判断节点当前业务量大小。在时隙剩余的情况下,通过TS-ALG算法选定业务较繁忙的节点,以业务繁忙节点地址为目的地址发出令牌,目的节点收到令牌后发送数据至时隙结束。利用OPNET软件建立了TP-TDMA协议仿真模型,并与TDMA协议和HFTP协议作了不同业务量条件下的性能比较。仿真结果证明,TP-TDMA相比TDMA协议和HFTP协议,在信息投递率、吞吐量和平均时延方面具有更优异的性能。Aiming at the features of faster fluctuations and fading of high frequency（ HF） communication via skywave propagation,a dynamic TDMA protocol based on token（ TP-TDMA） is designed with inserting the token theory inside the TDMA slot. TP-TDMA protocol can use TDMA slot dynamically,and overcome the dependency of HFTP on token passing. In the protocol,the token-send-algorithm（ TS-ALG） is raised which statistic the traffic before a short time,and give different weightings according to their sending time. Then we sum every node＇s value up,for judging the realtime traffic. On condition that the slot is surplus,we conduct selecting a node which has heavy traffic according to the summation,and choosing the node ID as the destination address to broadcast a token,informing the node to occupy the remaining slot for sending data until the slot is end. Finally,the simulation model of TP-TDMA is developed by OPNET and comparison is made with TDMA protocol and HFTP protocol under different traffic condition. Simulation results show that TP-TDMA protocol has better performance than TDMA protocol and HFTP protocol on the parameters of message delivery ratio,network throughput and traffic delay.

关 键 词：短波通信 令牌 时分多址 时隙分配 

分 类 号：TN92[电子电信—通信与信息系统]