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GSM Building BlocksĪ key component of the GSM standard is the SIM (Subscriber Identity Module) card, tied to your mobile phone carrier. FDMA, divides the frequency band into parts and allocate it to each mobile phone towers. TDMA divides the network channel in to single time bits which are then allotted to data for a single, or multiple users. GSM works on a combination of TDMA (Time Division Multiple Access ) and FDMA (Frequency Division Multiple Access) methodologies. Originally, GSM was established as Groupe Spécial Mobile, a team responsible for research on mobile communication mechanisms. It is the standard protocol that is used by cellular networks or telcos such as Optus, Vodafone and Telstra. GSM is the most popular mobile phone technology in the world. If you’d like to know more, including how we got to 3G & finally LTE, the current best in class wireless network speed then check out this article. In this article, Whatphone explains how we got from 1991 to the first data capabilities over wireless networks – GPRS. Over the last 2 decades, the technology has evolved at an increasing rate, first turning all wireless communications digital and then leapfrogging itself on data speeds. GSM is the core communication standard behind all modern mobile phones, including the ones used in Australia. Commercially released in 1991, GSM is short for Global System Mobile Communications.