2.2 LTE-Advanced and IMT-Advanced
The International Telecommunication Union Radiocommunication Sector (ITU-R) [2] started process for the new system, International Mobile Telecommunications Advanced (IMT-Advanced), with the circular letter distributed in 2008 to call for radio technology proposals, following the earlier process for IMT-2000 as covered in [1]. ITU-R called for proposals for radio technologies that could meet the requirements set for a versatile radio technology to qualify as an IMT-Advanced technology, often also denoted as the 4th generation (4G) mobile communication system. 3GPP responded to the circular letter with the submission of the Release 10 LTE-Advanced and evaluation results of the achievable performance with LTE-Advanced. The process was completed with the full set of specifications submitted at the end of 2010, with some updates during 2011. The ITU-R IMT-Advanced and 3GPP LTE-Advanced process schedules are shown in Figure 2.1.
Figure 2.1 LTE-Advanced standardization and IMT-Advanced process schedule.
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