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作为 TETRA 通信的一种方式,TETRA DMO 使得 TETRA 移动台在没有设置基站以及基站覆盖范围之外的地区、系统出现故障或过载以至难以快速接人时可以不经过网络基础设施直接进行相互的通信,从而降低了移动台通信对基站的依赖性,扩展了移动台通信的地理范围。文中首先依照协议对直通模式移动台通信方式和呼叫接续过程进行了介绍,并描述了利用工具 SDL and TTCN suite 4.5对其中的电路模式呼叫流程编程、仿真的过程,最后对仿真的结果进行了简要说明。
As a way of TETRA communication, TETRA DMO enables TETRA mobile stations to communicate directly with each other without network infrastructure without system or base station coverage, failure or overload of the TETRA mobile station, Thereby reducing the dependence of the mobile station on the base station and expanding the geographical range of the mobile station’s communication. In this paper, we firstly introduce the communication mode of direct mode mobile station and the call connection process according to the agreement, and describe the process of programming and simulation of the circuit mode call flow in the tool SDL and TTCN suite 4.5. Finally, the simulation results are briefly Description.