Seamless mobility for 5G and LTE systems and devices

A base station, comprising:

• a transceiver arranged to communicate with a user equipment (UE);
• and
• processing circuitry arranged to:
• configure the transceiver to transmit measurement control signals to the UE;
• configure the transceiver to receive measurement feedback from the UE based on the measurement control signals:
• determine that a handover of the UE is to occur based on the measurement feedback;
• generate a radio resource control (RRC) reconfiguration message comprising reconfiguration information comprising at least one parameter indicating whether to perform at least one of a physical layer reconfiguration, a layer 2 reconfiguration, or a security key update during the handover of the UE, wherein the RRC reconfiguration message causes the UE to engage in the handover from the source cell to the target cell without the at least one of the physical layer reconfiguration, the layer 2 reconfiguration and the security key update;
• and
• configure the transceiver to transmit the RRC reconfiguration message to the UE.

A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of a user equipment (UE) to configure the UE to:

• receive a radio resource control (RRC) reconfiguration message comprising reconfiguration information including at least one indicator indicating whether to perform at least one of a physical layer reconfiguration, a layer 2 reconfiguration or a security key update during a handover;
• engage in the handover from a source cell to a target cell based at least on the reconfiguration information, including:
• performing the layer 2 reconfiguration when a first indicator indicates to perform the layer 2 reconfiguration, wherein the layer 2 reconfiguration is one or more of a packet data convergence protocol (PDCP) re-establishment or a radio link control (RLC) re-establishment;
• performing the security key update when a second indicator indicates to perform the security key update;
• or
• performing the physical layer reconfiguration when a third indicator indicates to perform the physical layer reconfiguration, the physical layer reconfiguration including a random access channel (RACH) operation on the target cell.