While watching the specifications of most of the smartphones currently, i dont understand the meaning of HSUPA and HSDPA, could anyone here explain me the meaning and what is the difference between them.

Hi,
HSDPA (High Speed Downlink Packet Access) is the one that improves the downlink of the data transmission while HSUPA (High Speed Uplink Packet Access) is the one that improves the uplink or transmission from the mobile device to the network.