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Benefits of HSPA Supplemental Downlink
Supplemental Downlink (SDL) has been enabled in Release 9 as part of the evolution of High Speed Downlink Packet Access (HSDPA). While the serving carrier (cell) for an HSDPA UE is part of paired spectrum, the SDL carrier is part of unpaired spectrum in a different band. Thus, SDL operation helps efficiently utilize unpaired spectrum for HSDPA.
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3/23/12