Method and apparatus for supporting a supplementary uplink frequency in wireless communication system

A method for performing a random access by a base station (BS) in a wireless communication system, the method comprising:

• transmitting, to a terminal, random access configuration information;
• receiving, from the terminal, a random access preamble on one of an uplink (UL) carrier and a supplementary uplink (SUL) carrier, wherein the one of the UL carrier and the SUL carrier is selected by the terminal based on the random access configuration information;
• receiving, from the terminal, data on the selected uplink carrier of the UL carrier and the SUL carrier;
• receiving, from the terminal, capability information of the terminal including information indicating whether the terminal supports the other of the UL carrier and the SUL carrier for switching;
• transmitting, to the terminal on a physical downlink control channel (PDCCH), information indicating the other of the UL carrier and the SUL carrier based on the capability information of the terminal;
• and
• receiving, from the terminal, uplink data on the other of the UL carrier and the SUL carrier,
• wherein the UL carrier and the SUL carrier are associated with one downlink carrier configured for the terminal.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor configured to:
• control the transceiver to receive, from a base station (BS), random access configuration information,
• select one of an uplink (UL) carrier or a supplementary uplink (SUL) carrier to perform a random access, based on the random access configuration information,
• control the transceiver to transmit, to the BS, a random access preamble on the selected one of the UL carrier and the SUL carrier,
• control the transceiver to transmit, to the BS, capability information of the terminal including information indicating whether the terminal supports the other of the UL carrier and the SUL carrier for switching,
• control the transceiver to receive, from the BS on a physical downlink control channel (PDCCH), information indicating the other of the UL carrier and the SUL carrier based on the capability information of the terminal, and
• control the transceiver to transmit, to the BS, uplink data on the other of the UL carrier and the SUL carrier,
• wherein the UL carrier and the SUL carrier are associated with one downlink carrier configured for the terminal.

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

• a transceiver;
• and
• at least one processor configured to:
• control the transceiver to transmit, to a terminal, random access configuration information,
• control the transceiver to receive, from the terminal, a random access preamble on one of an uplink (UL) carrier and a supplementary uplink (SUL) carrier, wherein the one of the UL carrier and the SUL carrier is selected by the terminal based on the random access configuration information,
• control the transceiver to receive, from the terminal, data on the selected uplink carrier of the UL carrier and the SUL carrier,
• control the transceiver to receive, from the terminal, capability information of the terminal including information indicating whether the terminal supports the other of the UL carrier and the SUL carrier for switching,
• control the transceiver to transmit, to the terminal on a physical downlink control channel (PDCCH), information indicating the other of the UL carrier and the SUL carrier based on the capability information of the terminal, and
• control the transceiver to receive, from the terminal, uplink data on the other of the UL carrier and the SUL carrier,
• wherein the UL carrier and the SUL carrier are associated with one downlink carrier configured for the terminal.