Mobility Enhancements for Cellular Communications

An apparatus, comprising:

• one or more processing elements configured to:
• communicate with first and second base stations according to a multi-connectivity configuration, wherein the first base station acts as a master base station;
• send a measurement report to the first base station that initiates a role switch procedure between the first and second base stations;
• receive a downlink activation SN from the first base station and store the downlink activation SN;
• prior to the activation SN, process downlink data from the first and second base stations using a security configuration of the first base station;
• and
• after the activation SN, process downlink data from the first and second base stations using a security configuration of the second base station.

A non-transitory computer-readable medium having instructions stored thereon that are executable by a computing device to perform operations comprising:

• communicating with first and second base stations according to a multi-connectivity configuration, wherein the first base station acts as a master base station;
• sending a measurement report to the first base station that initiates a role switch procedure between the first and second base stations;
• receiving a downlink activation SN from the first base station and storing the downlink activation SN;
• prior to the activation SN, processing downlink data from the first and second base stations using a security configuration of the first base station;
• and
• after the activation SN, processing downlink data from the first and second base stations using a security configuration of the second base station.