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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 ... Voir Plus
HSDPA, HSUPA, HSPA, HSPA+
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 ... Voir Plus
I hope you are asking about Multiple Access. If it is then LTE and LTE-A both uses different Multiple Access i.e Downlink: OFDMA Uplink: SC-FDMA
UMTS is3rd mobile generation technology for voice and data transfer, HSPA is enhancement of UMTS for high speed data tranfer.