“HSUPA (also known as Enhanced Uplink) is a 3G protocol that provides uplink speeds up to 5.76 Mbps in the Category 6 flavor supported by iPhone 4,” Dilger reports. “It joins HSDPA (High-Speed Download Packet Access), the enhanced download upgrade to UMTS 3G service that was supported by last year’s iPhone 3GS, enabling up to 7.2 Mbps downloads. Because it lacked support for HSUPA, iPhone 3GS was limited to just 384 kbps uploads.”
Dilger reports, “Support for both HSDPA and HSUPA in iPhone 4 makes the phone a ‘3.5G’ device and means it can theoretically achieve 7.2 Mbps downloads and 5.8 Mbps uploads, but those capabilities are also dependent upon the mobile operator. In the US, AT&T’s 3G HSDPA primarily maxes out at 3.2 Mbps, with typical speeds ranging from 0.7 to 1.7 Mbps. The company is in the process of deploying faster 7.2 Mbps service, but this is currently limited to just a few cities: Charlotte, Chicago, Dallas, Houston, and Los Angeles and Miami.”
Read more in the full article here.
[Thanks to MacDailyNews Reader “Andrew W.” for the heads up.]
