Design And Implentation Of The Basic Call Module For TETRA Trunking Communications System

This topic originated from "Digital trunking communication system based on TETRA technology" project of Datang Nanjing Automation Co., Ltd. the project reference to GSM/WCDMA/cdma2000 network architecture and design TETRA system network architecture combined with the ETSI TETRA trunking communication standard.This article is the design and realization of Basic Call Module(BCM) software of switching control center SCC in TETRA digital trunking communication system project.The BCM module has to implement teleservices, including:1) Single call: one-on-one private call, including single call between mobile users and mobile user and dispatcher DAS;2) Group call: a group call, including group call initiated by the user, and dispatch group call initiated by the sdispatcher DAS;3) PTT:Push To Talk function.The project, baseed on the existing 3G system software architecture, data structure and algorithm of Datang Nanjing Automation Co., Ltd., design BCM module protocol architecture, data structure and key algorithms. The BCM module main implement the following interfaces:1) Ta Interface: Referring GSM/WCDMA/cdma2000 base station controller BSC and the mobile switching center MSC A-interface protocol, designed TETRA system Ta interface protocol.2) Tm interfaces: Referring GSM and cdma2000 roaming protocol(MAP), designed Tm interface protocol between BCM ans database VDB.After the implement of BCM module,we have tested the service of BCM module through under the current teleservice test environment of Datang Nanjing Automation Co., Ltd.This paper mainly describe the implement of BCM module through the implement of Ta,Tm,Td interface.