| 2 | 5G | | 2019 | | 5G | 5G | 5G | | 3GPP | 12 5G 3GPP R15 | 5G | | 3GPP R15 | 5G 5G | | 5G | 6 2020 | | 5G | 2019 | 5G | | | 5G 2018 | 5G | | |