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DL : Downlink UL : Uplink
HSDPA -High Speed Packet Access
A link budget is accounting of all of the gains and losses from the transmitter, through the medium (free space, cable, waveguide, fiber, etc.) to the receiver in a telec ... See More
UMTS (universal mobile telecommunication system)for voice and data and the modulation technique is QPSK HSPA(high speed packet access for data only and the modulation tec ... See More
UMTS is3rd mobile generation technology for voice and data transfer, HSPA is enhancement of UMTS for high speed data tranfer.