ABSTRACT
Cellular Mobile Communications is one of the tremendous success stories of the telecommunication industry. In past there were 293 million subscribers that is around one mobile phone for every four inhabitants. Current growth continues to exceed most past projections. The challenges to Cellular Mobile Communication are meeting wider policy goals in relation to electronic commerce and local infrastructure competition.
Increase in demand of existing service led Cellular Mobile Service providers to research ways to improve the quality of service and to support more users in their system. But in Cellular and Mobile Systems, the equipment was limited to operate. In order to overcome these problems modern cellular telephony is introduced which is a digital cellular communication named as GSM. GSM, Global System for mobile communication lightens spectrum efficiency, International roaming, good subjective voice, quality and compatibility with other systems.
The aim of GSM system is to describe the functionality and the interface for each component of the system and guide the design of the system. GSM provides tele-services like Short Message Service (SMS) in which maximum of 160 alphanumeric characteristics can be sent to or from any mobile station. Even if the mobile is powered off the message can be stored and with the SMS cell broadcast a message of maximum 93 characters can be sent in a certain geographical area. FAX mail, thanks to this service as the subscriber can receive FAX message at any FAX machine. Voice mail corresponds to answering machine when the subscriber is unable to attend the call.
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