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HSUPA (singketan tina kecap-kecap bahasa Inggris High-Speed Uplink Packet Access) mangrupa salah sahiji protokol telepon mobil 3G anu kawengku ku kulawarga standar HSPA kalayan laju data up-link bisa nepi ka 5.76 Mbit/s. Ngaran HSUPA dijieun ku Nokia. 3GPP sorangan henteu ngagunakeun ngaran 'HSUPA', tapi maké ngaran Enhanced Uplink (EUL).

Spésifikasi pikeun HSUPA aya dina jero standar UMTS Release 6 anu dikaluarkeun ku 3GPP.

– "Tujuan tina dijieunna pasaratan Enhanced Uplink nyaéta pikeun ngahadéan unjuk gawé kanal transpor pikeun uplink, nyaéta pikeun ningkatkeun daya muat (kapasitas) jeung throughput sarta ngurangan waktu tunda (delay)."

HSUPA uses an uplink enhanced dedicated channel (E-DCH) on which it will employ link adaptation methods similar to those employed by HSDPA, namely:

shorter Transmission Time Interval enabling faster link adaptation;

HARQ (hybrid ARQ) with incremental redundancy making retransmissions more effective.

Similarly to HSDPA, HSUPA uses a packet scheduler, but it operates on a request-grant principle where the UEs request a permission to send data and the scheduler decides when and how many UEs will be allowed to do so. A request for transmission contains data about the state of the transmission buffer and the queue at the UE and its available power margin. However, unlike HSDPA, uplink transmissions are not orthogonal to éach other.

In addition to this scheduled mode of transmission the standards also allows a self-initiated transmission mode from the UEs, denoted non-scheduled. The non-scheduled mode can, for example, be used for VoIP services for which even the reduced TTI and the Node-B based scheduler will not be able to provide the very short delay time and constant bandwidth required.

éach MAC-d flow (i.e. QoS flow) is configured to use either scheduled or non-scheduled modes; the UE adjusts the data rate for scheduled and non-scheduled flows independently. The maximum data rate of éach non-scheduled flow is configured at call setup, and typically not changed frequently. The power used by the scheduled flows is controlled dynamically by the Node-B through absolute grant (consisting of an actual value) and relative grant (consisting of a single up/down bit) messages.

At Layer 1, HSUPA introduces new physical channels E-AGCH (Access Grant Channel), E-DCH Relative Grant Channel, F-DPCH (Fractional-DPCH), E-HICH (E-DCH Hybrid ARQ Indicator Channel), E-DPCCH (E-DCH Dedicated Physical Control Channel) and E-DPDCH (E-DCH Dedicated Physical Data Channel).

E-DPDCH is used to carry the E-DCH Transport Channel; and E-DPCCH is used to carry the control information associated with the E-DCH.