Method and apparatus for applying uplink 7.5 kHz frequency shifting when LTE cell and NR cell coexist in TDD band in next generation mobile communication system

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

• receiving, from a base station, system information including an indicator indicating whether a 7.5 kHz frequency shifting is enabled for a certain time division duplex (TDD) band among a plurality of new radio (NR) operating bands supporting TDD;
• identifying whether a frequency band for an uplink transmission is the certain TDD band, based on the system information;
• and
• transmitting, to the base station, an uplink signal in the frequency band by applying the 7.5 kHz frequency shifting, in case that the frequency band is the certain TDD band and the 7.5 kHz frequency shifting is enabled for the certain TDD band based on the indicator.

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

• a transceiver configured to perform signal transmission or reception with a base station or a user equipment (UE);
• and
• a processor configured to control:
• identify a predetermined band,
• determine whether the predetermined band is a certain time division duplex (TDD) band among a plurality of new radio (NR) operating bands supporting TDD and requires a 7.5 kHz frequency shifting for an uplink transmission,
• in case that the predetermined band is the certain TDD band and requires the 7.5 kHz frequency shifting for the uplink transmission, generate an indicator for the 7.5 kHz frequency shifting which indicates that the 7.5 kHz frequency shifting is enabled for the uplink transmission in the certain TDD band, and
• transmit, to the UE, a first system information message including the indicator.

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

• a transceiver configured to perform signal transmission or reception with a base station;
• and
• a processor configured to:
• receive, from the base station, system information including an indicator indicating whether a 7.5 kHz frequency shifting is enabled for a certain time division duplex (TDD) band among a plurality of new radio (NR) operating bands supporting TDD,
• identify whether a frequency band for an uplink transmission is the certain TDD band, based on the system information, and
• transmit, to the base station, an uplink signal in the frequency band by applying the 7.5 kHz frequency shifting, in case that the frequency band is the certain TDD band and the 7.5 kHz frequency shifting is enabled for the certain TDD band based on the indicator.