Radio Resource Control (RRC) manages signaling between the User Equipment (UE) and the eNodeB. The RRC connection setup is the first step before a UE can exchange data with the network.

RRC Connection Setup Flow:-

Response Codes for RRC Connection Failures:-

Common RRC Connection Failures:-

RRC Connection Request:-

 “MO-Signaling" (for IMS signaling)

 “MO-Data" (for data transmission)

 “Emergency" (for emergency calls)