If a 5G family of standards would be implemented, it would likely be around the year of 2012-13 according to some source. A new mobile generation has appeared every 10th year since the first 1G system (NMT) was introduced in 1981, including the 2G (GSM) system that started to roll out in 1992, and 3G (W-CDMA/FOMA), which appeared in 2001. The development of the 2G (GSM) and 3G (IMT-2000 and UMTS) standards took about 10 years from the official start of the R&D projects, and development of 4G systems started in 2001 or 2002. From users point of view, previous mobile generations have implied substantial increase in peak bitrates (i.e. physical layer net bitrates for short-distance communication).