Method for controlling handover in wireless communication system, and device therefor

A first pico Base Station (BS) for controlling handover between the first pico BS and a second pico BS in a wireless communication system, the first pico BS comprising:

• a transceiver;
• and
• a processor that:
• controls the transceiver to receive, from the second pico BS, an operation switching request to switch an operation with the second pico BS, instead of a handover request to initiate a handover procedure for a user equipment (UE) with the second pico BS,
• controls the transceiver to exchange transmission configuration information with the second pico BS, for switching the operation with the second pico BS,
• wherein controlling the transceiver to exchange the transmission configuration information with the second pico BS includes controlling the transceiver to transmit transmission configuration information of the first pico BS and receive transmission configuration information of the second pico BS,
• wherein the transmission configuration information of the first pico BS includes a first physical cell identity of the first pico BS,
• wherein the transmission configuration information of the second pico BS includes a second physical cell identity of the second pico BS,
• changes the transmission configuration information of the first pico BS to the transmission configuration information of the second pico BS to operate using the transmission configuration information of the second pico BS,
• wherein an operation based on the transmission configuration information of the first pico BS is maintained by the first pico BS, during an operation transition time configured for the change of the transmission configuration information of the first pico BS to the transmission configuration information of the second pico BS, and
• generates and controls the transceiver to transmit a downlink reference signal (RS) of the first pico BS,
• wherein the processor is configured to generate the downlink RS of the first pico BS based on the first physical cell identity before the change of the transmission configuration information of the first pico BS to the transmission configuration information of the second pico BS is completed, and
• wherein the processor is configured to generate the downlink RS of the first pico BS based on the second physical cell identity after the change of the transmission configuration information of the first pico BS to the transmission configuration information of the second pico BS is completed.