DSCH is used in UMTS to send packets on the downlink to the UEs. In Information technology, a packet is a formatted unit of Data carried by a Packet mode Computer network. Uplink An uplink (UL or U/L is the portion of a communications link used for the transmission of signals from an Earth terminal In the Universal Mobile Telecommunications System (UMTS user equipment ( UE) is any device used directly by an end user to communicate Notably it is used in HSDPA as HS-DSCH (High-Speed DSCH). High-Speed Downlink Packet Access ( HSDPA) is a 3G (third generation Mobile telephony Communications protocol in the High-Speed Packet High-Speed Downlink Shared Channel ( HS-DSCH) is used in HSDPA ( UMTS) to send packets on the Downlink to the UEs It is called