IMT-2000 service started around year of 2000 to support global roaming with high speed data rate. But 3GPP and 3GPP2 could not narrow gaps between them to make separate specification. To make it worse, economy regression delayed deployment. Starting 2007, WCDMA, standardized in 3GPP, was launched in Korea by KT and SKT. 3GPP introduced HSDPA and HSUPA as an enabler for high speed down and uplink packet service, in release5 and release5, respectively.