【作者】 张娟；

【导师】 张文柱； 杨家玮；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2012， 硕士

【摘要】 数字通信技术以及数字信号处理技术的不断成熟，推动着专用移动通信系统向数字化方向发展。数字移动无线电系统(Digital Mobile Radio，DMR)系统是一种专用数字移动通信系统。它是欧洲电信标准协会（ETSI）在2004年提出的，并于2007年进行了完善。DMR系统是在PMR(Private Mobile Radio)基础上发展而来的，且处于不断完善阶段。与已经成熟的TETRA和iDEN相比，DMR具有成本低廉、技术简单、并支持从模拟到数字的过渡等优点。DMR系统可以实现与公众电话网（PSTN）、IP网等相关设备互联达到无障碍通信，并且系统中对DMR联网协议的限制最小化。DMR系统无论是在国内还是在国外都处在起步阶段，受到生产商、科研人员等的广泛关注，具有良好的发展前景。本文主要研究DMR系统的转发模式，首先介绍了基于DMR系统的分层结构以及各层实现的主要功能，并详细分析了基于DMR协议第二阶段的信道接入准则与接入过程；其次讲述了DMR联网协议的基本原理，包括协议结构，信道模式以及随机接入过程和呼叫过程等；然后从基于DMR协议第二阶段的转发模式的工作方式、呼叫过程、信令的传输规程等几个方面进行了详细分析。随后本文从单基站转发和多基站转发两种场景分析了DMR系统转发协议仿真的实现流程，在C++Builer6.0开发环境下，编写了符合DMR转发协议模式的语音呼叫控制程序，并对DMR协议性能进行了分析与仿真。最后对全文做了简要总结。更多还原

【Abstract】 The continuous maturation of digital telecommunications technology and digitalsignal processing technology, promotes the dedicated mobile communication systems todevelop in the direction of digitization.ETSI(European telecom association ofstandard)proposed Digital Mobile Radio(DMR) standards in2004and perfected it in2007.DMR system,which is developed on the basis of PMR(Private Mobile RAdio)andin the phase of ceaseless perfection,is a dedicated digital mobile communicationsystem.Compared to the matured TETRA and iDEN,it has the advantages of lower cost,simpler technology and supports from analog to digital transition.DMR system can beinterconnected with public telephone network(PSTN),IP network and other relatedequipments and achieves barrier-free communication,and restrictions on DMRinterconnection protocal is minimized in this system. DMR system is in the early stageboth at home or abroad,and has araused whether manufacturers or scientific researchpersonnel’s extensive concern,therefore it has good prospects.This paper,which mainly studies the repeater mode of the DMR system,fisrtintroduces the layered structure based on the DMR system and the main functionsrealized by each layer,and gives a detailed analysis of the channel access principles andaccess process based on the second stage of DMR protocol;second describes theprinciples of the DMR interconnection protocal,including protocol architecture,channelmode,random access process,calling procedure and so on; third carries on detailedreaserch on the operation mode, calling procedure, signaling transmission procedure andother several aspects of the transfer pattern based on the second stage of the DMRprotocol.Then this paper analyzes the realization process of simulation,and writes acontrol layer software in accordance with the tranfer pattern of the DMRcommunication protocol in the development environment of c++Builer6.0, thensimulates and analyzes the performance of the DMR protocol.at last gives a brieflysummary of the whole text.更多还原