The GSM has the topology of the base station subsystem, user equipment, and core networks. 1 to 25 frequency bands are assigned in the frequency division duplex, whereas the LTE ranges from 33 to 43 on time division duplex. The several frequencies of LTE in every country are allotted with set limits. It requires wide channels and is called universal mobile telephone systems. As the name express, it has maximum data capacity. The frequency of824 MHz to 894 MHz is provided by CDMA, which is flexible and called 3G GSM.
The channel width is calibrated as 200 MHz, and the TDMA process does the segregation of carrier frequency into eight slots.
The FDMA segregates 25 MHz into a carrier frequency of 124 slots. GSM has the system frequency of dual bands such as 1800 MHz and 900 MHz and called GSM-900 and DCS-1800. Frequency Channel of Wireless Technologies
