The third generation of mobile communications (3G) was to be based on uniform mobile communications standards worldwide, resulting in International Mobile Telecommunication 2000( IMT-2000). Frequencies were defined for these systems in the 2 GHz band. The fact that nothing ultimately came of the globally uniform mobile communications standard is due to commercial reasons.
The third generation of mobile communications is understood to be the migration from the GSM standard, which characterized the 2nd generation( 2G), via General Packet Radio Service( GPRS) and Enhanced Data Service for GSM Evolution( EDGE), the 2.5th generation ( 2.5G) to UMTS.
The real goal of 3G, harmonization of global standardization, was further pursued by compromises in IMT-2000 through alternative air interfaces.
The International Telecommunication Union( ITU) defined two variants for 3rd generation (3G): Wideband Code Division Multiple Access(WCDMA) and CDMA2000. In Europe, WCDMA has gained acceptance in the form of UMTS.
Stakeholders involved in 3G include the UMTS Forum, the GSM Association, the IPv6 Forum, and the Universal Wireless Communications Consortium.