E1 signalling transport
The present document specifies the standards for Signalling Transport to be used across the E1 interface. The E1 interface provides means for the interconnection of gNB-CU-CP and gNB-CU-UP within the NG-RAN architecture (TS 38.401 [2]), or for the interconnection of ng-eNB-CU-CP and ng-eNB-CU-UP within the NG-RAN architecture (TS 38.401 [2]), or for the interconnection of eNB-CP and eNB-UP within the E-UTRAN architecture (TS 36.401 [13]).