In the same way that HSDPA has a series of categories defined, so too does HSUPA.
The HSUPA categories define the basic capabilities for the handset or UE and enable the base station or Node B to communicate effectively, knowing the limits of the performance.
Knowing its capabilities, the Node B can allocate sufficient resources to the UE and enable the optimum performance to be obtained.
HSUPA category definitions
The HSUPA categories are detailed in the table below. This shows the different HSUPA categories, and basic definitions including the respective data rates.
|HSUPA category definitions
|HSUPA category number||Maximum number E-DPDCHs||Minimum spreading factor||Support for 2 ms TTI*||Maximum transport block size
(10 ms TTI)
| Maximum transport block size
(2 ms TTI)
| Maximum data rate
|4||2||SF2||Y||20000||5837||2 Mbps for 10 ms TTI
2.9 Mbps for 2 ms TTI
|6||2 + 2**||SF2||Y||20000||11520||2 Mbps for 10 ms TTI
5.74 Mbps for 2 ms TTI
*A 10 ms TTI is supported in all categories
** Two E-DPDCHs at SF2 and two at SF4
Support for the E-DCH TTI (Transmission Time Interval) of 10 ms is required for all HSUPA categories. It is only some HSUPA categories that support a 2 ms TTI. Also the highest data rate supported with a 10 ms TTi is 2 Mbps. The reason for this is to limit the amount of buffer memory required in the NodeB for soft combining because a larger block transport size means that a larger soft buffer is needed for retransmissions.
With HSUPA deployed as part of the overall HSPA upgrade, data speeds available to users rose considerably. The uplink was a key part of this, reducing latency and enabling much faster transmission in the uplink.
Wireless & Wired Connectivity Topics:
Mobile Communications basics 2G GSM 2G GPRS 2G GSM EDGE 3G UMTS 3G HSPA 4G LTE 5G LMR / PMR WiFi IEEE 802.15.4 DECT cordless phones NFC- Near Field Communication Ethernet Serial data USB Z-Wave SigFox LoRa
Return to Wireless & Wired Connectivity