Communication method and apparatus for bandwidth part switching in wireless communication system

A user equipment (UE) in a wireless communication system, the UE comprising:

• a transceiver;
• and
• at least one controller configured to:
• receive, from a base station, configuration information for a bandwidth part (BWP) of a serving cell, the configuration information including information associated with a BWP timer,
• identify whether a physical downlink control channel (PDCCH) for a BWP switching of the serving cell is received,
• perform the BWP switching and starting the BWP timer in case that the PDCCH for the BWP switching of the serving cell is received,
• receive, from the base station, a radio resource control (RRC) message associated with a handover, the RRC message including information on a BWP of a target cell,
• stop the BWP timer based on the RRC message, and
• perform, on the target cell, a random access procedure based on the information on the BWP of the target cell.

A method performed by a base station in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE), configuration information for a bandwidth part (BWP) of a serving cell, the configuration information including information associated with a BWP timer;
• transmitting, to the UE, a radio resource control (RRC) message associated with a handover, the RRC message including information on a BWP of a target cell;
• and
• forwarding data to the target cell,
• wherein the BWP timer is stopped based on the RRC message.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• at least one controller configured to:
• transmit, to a user equipment (UE), configuration information for a bandwidth part (BWP) of a serving cell, the configuration information including information associated with a BWP timer,
• transmit, to the UE, a radio resource control (RRC) message associated with a handover, the RRC message including information on a BWP of a target cell, and
• forward data to the target cell,
• wherein the BWP timer is stopped based on the RRC message.