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What is the difference between GPRS, HSPA and HSDPA?

What is the difference between GPRS, HSPA and HSDPA?

In wireless communication we use the above services to access the internet. What are the differences between the above technologies. I know that there are differences in speeds but I expect some statistical information or technology definition like thing. I mean a good comparison :)

Asked by: Guest | Views: 57
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Guest [Entry]

"GPRS or Generalized Packet Radio Service is generally associated with 2G networks and provides data rates of 56-114 kbit/s.

HSPA or High Speed Packet Access describes a family of related cellular data protocols.

HSDPA or High-Speed Downlink Packet Access is a particular HSPA protocol and currently provides for speeds of 1.8, 3.6, 7.2 and 14.0 Mbit/s."