High Speed Uplink Packet Access (HSUPA)
The second major step in the WCDMA upgrade process is to upgrade the uplink, which is introduced in 3GPP Release 6. Upgrading to HSUPA is usually only a software update. Enhanced Uplink adds a new transport channel to WCDMA, called the Enhanced Dedicated Channel (E-DCH). An enhanced uplink creates opportunities for a number of new applications including VoIP, uploading pictures and sending large e-mail messages. The enhanced uplink increases the data rate (up to 5.8 Mbit/s), the capacity, and also reduces latency. The enhanced uplink features several improvements similar to those of HSDPA, including multi-code transmission, short Transmission Time Interval (TTI), fast scheduling and fast Hybrid Automatic Repeat reQuest (HARQ).
In Singapore, Starhub announced a 1.9 Mbit/s HSUPA Service as part of its new MaxMobile plan on 1 August 2007. In Finland, Elisa announced on 30 August 2007 1.4 Mbit/s HSUPA to most large cities with plans to add the service to its whole 3G network within months. (The same announcement contained a promise of covering 25% more of Finland by the end of the year, which actually took two more years to accomplish). 3 Italia and Ericsson announced on 16 July 2008 the successful tests of HSUPA 5.8 Mbit/s in the live network of 3 Italia. In Haiti, NATCOM, the former public company now operated by Viettel from Vietnam, offers up to 7.2 Mbit/s nationwide.
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