摘要
数字专用无线电对讲机(DPMR,Digital Private Mobile Radio)协议是欧洲电信标准化协会推出的一种适用于民用数字对讲机系统的通信协议。首先,按照简化的开放系统互连(OSI,Open System Interconnection)分层模型对DPMR标准进行了简单的介绍。其次,以DPMR数字对讲机系统的呼叫控制功能为研究对象,详细叙述了系统的基本呼叫流程,并以有限状态机为基础设计出协议的状态转换过程;最后,以Visual C++为平台,实现该呼叫控制方案的设计过程,并给出相关设计结果。通过结果分析,进一步验证了该呼叫控制方案的可行性。
DPMR,a communication protocol applicable to civilian radio system,is proposed by European Telecommunications Standards Institute（ETSI）.Firstly,DPMR standard is briefly introduced according to the simplified OSI layer model,then based on the study of call control of DPMR digital walkie-talkie system,a detailed description of the basic calling procedure about peer-to-peer call,group call and SMS transmitting function is given,the state shift process of the protocol is designed on the basis of the extend finite state machine.Finally,with Visual C＋＋ ad the platform,the call control scheme is realized,and related results indicate that the call control scheme is feasible and practicable.
出处
《通信技术》
2011年第11期88-90,93,共4页
Communications Technology
