At the 75th meeting of the 3GPP RAN plenary meeting in March 2017, the standardization of R1155G NR was initiated. Based on the choice of the vast majority of operators and manufacturers in the industry, the conference adopted resolution RP-170741, R1155G NR including two time nodes, "Time node 1-December 2017 to complete Stage 35G NR independent networking, that is, network architecture Option-3"; "Time node 2-June 2018 to complete Stage 35G NR independent networking, that is, network architecture Option-2".
At the 79th meeting of the RAN plenary meeting in March 2018, a small number of operators wanted to retain some other network architectures in R15. After repeated debates, the meeting adopted resolution RP-180554, agreeing to introduce the third time node of R15 5G NR without affecting the progress and functions of 5G NR independent networking and 5G NR independent networking: "Time node 3-December 2018 to complete Stage 3 Late Drop, including network architecture Option-4, Option-7, and NR-NR dual connection".
So far, 5G NR independent networking has completed Stage 3 function in December 2017 and 5G NR independent networking has completed Stage 3 function in June 2018. These two versions are the choice of mainstream operators. In December 2018, the 3GPP RAN plenary meeting postponed only the completion time of the third time node Late Drop of R15 NR, that is, the Stage 3 function of Late Drop was completed in March 2019.