High-Speed Downlink Shared Channel
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High-Speed Downlink Shared Channel (HS-DSCH) is used in HSDPA (UMTS) to send packets on the downlink to the UEs. It is called High-Speed to distinguish it from the more general definition of the downlink shared channel (DSCH) in UMTS. (The latter channel is sometimes referred to as Release'99 DSCH.)
