At first to provide the wireless broadband service the technology called
GPRS(Global Packet Radio Service) or EDGE (Enhanced Data Rate for GSM
Revolution).This technology was 2.5 G.The data rate was limited to very low
data rate in this technology.The data rate in EDGE and GPRS was only about 128
kbps.
Then came 3G technology to provide high data rate and to support video
calling in GSM.This is basically UMTS and which is of two types HSPDA and
HSPA.Data Rate is high in HSPA than HSPDA.HSPA can send upto 21-45 Mbps data.
After that 4G came and WiMax is supported in this 4G technology.After WiMax
LTE (Long Term Evolution) is now successfully launched.
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