Handover supporting scheme in cellular mobile communication system

A base station control device for supporting handover of a terminal in a cellular mobile communication system including a terminal performing handover from a base station of a serving cell to a base station of a target cell, the base station control device comprising:

• a transceiver communicating with the terminal;
• and
• a processor coupled with the transceiver and configured to:
• determine to perform the handover of the terminal,
• check whether a resource, in a frequency domain and a time domain, being used by the base station of the serving cell is available to the base station of the target cell, based on whether at least one other cell adjacent to the target cell uses the same resource in the frequency domain and the time domain,
• allocate the same resource, in the frequency domain and the time domain, to the base station of the target cell based on the check result,
• control the transceiver transmit a message instructing to activate a channel with the allocated same resource to the base station of the target cell,
• control the base station of the serving cell and the base station of the target cell to transmit downlink traffic of the terminal together or receive uplink traffic of the terminal together on the channel with the allocated same resource, during a time interval,
• drive a timer for a certain period of time, and
• check whether a message indication success in decoding of the uplink traffic of the terminal is received from the base station of the target cell before the timer is expired.