 traffic capacity. It should be noted that while all these key capabilities may be important, the rele- vance of certain key capabilities may be significantly different depending on the usage scenarios presented above (see Table 2.2). 2.2 ITU Table 2.2 Enhancement of key capabilities from IMT-Advanced to IMT-2020. Key capabilities IMT-Advanced IMT-2020 Peak data rate 1 Gbps 20 Gbps User experienced data rate 10 Mbps 100 Mbps Spectrum efficiency Mobility 350 km/h 500 km/h Latency 10 ms Connection density 105 devices/km² 106 devices/km² Network energy efficiency Area traffic capacity 0.1 Mbps/m² 10 Mbps/m² Table 2.3 Timeline for standardization of IMT-2020 radio interface technologies. Timeline Process 2016 to first half of 2017 ITU defines minimum requirements for IMT-2020 radio interface technologies and call for proposals from ITU membership and external organizations. Second half of 2017 to Proponents submit their proposals on candidate IMT-2020 radio first half of 2019 interface technologies to ITU. Second half of 2018 to External evaluation groups evaluate the submitted proposals first half of 2020 whether the proposals satisfy the ITU minimum requirements. Second half of 2019 to ITU agrees on IMT-2020 radio interface technologies to be second half of 2020 included in an ITU-R Recommendation. 2.2.2 Standardization of IMT-2020 Radio Interface Technologies In order to embody the "IMT Vision" presented above, ITU started its process to develop a new ITU-R Recommendation for the IMT-2020 radio interface technologies and to achieve international standardization of 5G. The timeline and process for the develop- ment of IMT-2020 radio interface technologies are summarized in the table below [2] (see Table 2.3). In this process, ITU invites its membership and other organizations to submit their proposals on candidate radio interface technologies for IMT-2020. The submitted pro- posals will be evaluated by ITU membership and other external evaluation groups as to whether the proposed radio interface technologies can sa