9 Elements for E1AP communication
37.4833GPPE1 Application Protocol (E1AP)Release 17TS
NOTE: In this section, each occurance of gNB-CU-CP could be replaced by eNB-CP or ng-eNB-CU-CP, and each occurance of gNB-CU-UP could be replaced by eNB-UP or ng-eNB-CU-UP, for eNB CP-UP separation and ng-eNB CP-UP separation respectively.