Method and apparatus for performing communication in mobile communication system

A base station comprising:

• a transceiver;
• and
• a processor configured to:
• determine an uplink bandwidth identified based on a subcarrier spacing (SCS) of an initial uplink bandwidth-part (BWP) and a downlink bandwidth identified based on a SCS of an initial downlink BWP, and
• transmit, via the transceiver, a system information block 1 (SIB1) message including information indicating the determined uplink bandwidth and the determined downlink bandwidth,
• wherein in case that the uplink bandwidth and the downlink bandwidth is not supported at a user equipment (UE), a cell corresponding to the SIB 1 message is determined to be barred at the UE.

A method performed by a user equipment (UE), the method comprising:

• receiving a system information block 1 (SIB1) message;
• determining, based on the received SIB1 message, whether the UE supports an uplink bandwidth identified based on a subcarrier spacing (SCS) of an initial uplink bandwidth-part (BWP) and a downlink bandwidth identified based on a SCS of an initial downlink bandwidth-part (BWP);
• and
• based on the UE not supporting the uplink bandwidth and the downlink bandwidth, determining a cell corresponding to the SIB1 as barred.

A method performed by a base station, the method comprising:

• determining an uplink bandwidth identified based on a subcarrier spacing (SCS) of an initial uplink bandwidth-part (BWP) and a downlink bandwidth identified based on a SCS of an initial downlink BWP;
• and
• transmitting a system information block 1 (SIB1) message including information indicating the determined uplink bandwidth and the determined downlink bandwidth,
• wherein in case that the uplink bandwidth and the downlink bandwidth is not supported at a user equipment (UE), a cell corresponding to the SIB 1 message is determined to be barred at the UE.