THE DESIGN AND ARCHITECTURE OF THE (GSM) NETWORK WORKING FOR THE GLOBAL SYSTEM PLANNED IN OVER 80 COUNTRIES AROUND THE WORLD.

The global system for Mobile communication is a digital cellular communication system and it was developed in order to create a common mobile Standard but it has been rapidly accepted world wide .The idea was appeared in the USA in early 1970 however mobile cellular systems were not introduced for the commercial use and exercise till 1980 .It was lateron experienced by the United Kingdom to represent one of the fastest growing telecommunications system .But in the begining of cellular systems each country developed its own system,which was an undesirable situation for the following reasons (1) The equipment was limited to operate only with in the boundaries of each country (2) The market for each mobile equipment was limited. In order to overcome these problems the conference of the European countries formed (GSM) to develop a global system for required mobile communications. In 1989the Responsibility for the GSM specifications passed from the CEPT to European telecommunications Standard Institute with the aim to maintain standardized system of criterion ie spectrum efficiency, international roaming,low mobile and base stations costs ,Good subjective voice quality, Digital networks and ability to support new services .Later on during 1991 the GSM specifications were published and European standard network made planned and operational over eighty countries around the world.The main aim of the GSM specification is to describe it's functionality all over the world wide and the interface for each component of the system and to provide design and scope for the future course of system and Standard in order to guarantee the proper interworking between the different elements of the system governed by the GSM .