Signaling message synchronization

A user equipment (UE) operable to support dual connectivity, the UE having computer circuitry configured to:

• receive a radio resource control (RRC) reconfiguration message from a macro evolved node B (MeNB), the RRC reconfiguration message indicating to modify radio resource information of a secondary cell associated with a secondary eNB (SeNB);
• send a dedicated preamble to the SeNB indicating that the UE has completed an RRC reconfiguration procedure and that the secondary cell has been modified;
• and
• perform an uplink transmission to the SeNB having modified radio resource information, the UE supporting dual connectivity to the MeNB and the SeNB.

A method for supporting dual connectivity, the method comprising:

• receiving a radio resource control (RRC) reconfiguration message at a user equipment (UE) from a macro evolved node B (MeNB), the RRC reconfiguration message indicating that a secondary cell associated with a secondary eNB (SeNB) is to be activated, wherein the MeNB receives an indication to activate the secondary cell from the SeNB;
• sending uplink control information from the UE to the SeNB via an uplink control channel to inform the SeNB that the secondary cell has been activated, wherein the uplink control information includes predefined channel state information (CSI) values or a sounding reference signal (SRS);
• and
• receiving data at the UE from the SeNB after the SeNB detects the predefined CSI value or SRS, wherein the UE supports dual connectivity with the MeNB and the SeNB.