Research And Design Of Intelligent Base Station In Trunking System

Trunking communication system is an advanced special dispatching communication system. It is needed by Many departments which have much requires to the function of commanding and dispatching, for example, enterprises, railway, transportation, water conservancy, polices, troops, and so on. With the increase of requirement, a lot of areas without signal covering have appeared. So there is a demanding for such instruments, with which the extending problems can be resolved economically and efficiently without changing the distribution of the origin systems.We design a base station subsystem which can work independently (called intelligent base station), it is compatible with different systems manufactured by various companies, and can extend the covering range of current MPT-1327 trunking system transparently. Its difference from other systems is that it has channel relay unit which can communicate with the main trunking system. When the intelligent base station does not communicate with other systems, it can deal with communications and dispatching in its signal covering area. Through the channel relay unit the intelligent base station can be connected into the main system as a user and then connect with other networks through the main system. This configuration needn't modify the main system when extending the service area.The extrude characteristics of intelligent base station are its independent working and being a user for main trunking system (common trunking system, difference from Intelligent base station) when intelligent base station System communicate with other main trunking system. Because of its particularity, we must design new software to make it working. The channel relay unit is the important part of the intelligent base station, without it the intelligent base station won't have the special function. In the course of designing the channel relay unit, we use existing instruments or make it to be compatible with existing instruments as possible in order to reduce cost and difficulty. Based on the analysis to the architecture of current trunking system, a general design is presented in this dissertation. The principle and function features are also described in it. Signaling is a very import part of a telecommunication system, this article show the MPT 1327 signaling intelligent base station uses. Following, mostly we subscribe the process of its main control software and the design method of the channel relay unit software and hardware. In the chapter of the main control software designing, firstly we lay out the flow chart of Intelligent base station, then we designed some particular modules owned by the intelligent base station on the base of common trunking system, also we play out the flow chart for every module. In the chapter of the channel relay unit designing, we introduce how to design the hardware of the channel relay unit, also detailedly introduces the hardware structure and chips and how to design control software satisfied with transmission protocol.