LTE vs 3G and HSPA?
Hope some of these articles may help you.
http://en.wikipedia.org/wiki/LTE_Advanced
http://en.wikipedia.org/wiki/High_Speed_Packet_Access
http://www.3gpp.org/LTE
http://en.wikipedia.org/wiki/3GPP_Long_Term_Evolution
http://en.wikipedia.org/wiki/LTE_Advanced
http://en.wikipedia.org/wiki/High_Speed_Packet_Access
http://www.3gpp.org/LTE
http://en.wikipedia.org/wiki/3GPP_Long_Term_Evolution