The Study Of Digital Trunking Communication Technology Based DMR

DMR is short for Digital Mobile Radio, and as a mobile communication technology, it is only used for directing and attempering. The transferred signal of DMR is digital signal , therefore DMR has many more conspicuous characteristic than anolog signal.Recently, along with development in technology and needs for application, we need connect DMR with PSTN ,and adopt DSP technology to complete connection each other. This article mainly research on how to implement voice compressing coding between DMR and PSTN.This article starts with the conception of Digital Mobile Radio and the development of DMR, the overlook of DMR, and compare the differences between DMR and Common Mobile Communication, then describes the status of our country's DMR communication system by detail, then briefly introduce the GT800 new technology. After that, the article mainly focus on the communication protocol based on DMR, including protocol structure, IP service and short data bearer service and the description of PDU, detailed the air interface, voice service, group call service. In the end the paper briefly analysts the theme of applying DMR protocol in the interphone baseline module design.