3GPP standard versions include R99, R4, R5, R6 and R7. R99 version was frozen formally in Mar, 2000, and refreshes once every three months. Current commercial version of R99 is based on the version of June, 2001, for in later version, the number of CR is decreasing rapidly and there are no larger modifications and non-compatible upgrade.
R4 version was frozen in Mar, 2001. It passed in Mar, 2002 and is stable currently. R5 version was frozen in June, 2002 and is stable currently. Most R5 versions that providers support are the version of June, 2004. R6 version was frozen in June, 2005 and may be stable in a year. At present, R7/LTE has started up and its functional features are still in initial phase.
R99 and R4 versions are put into commercial use maturely. R6 version protocols are in developing status.
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