Method for transmitting and receiving signal based on lte and nr in wireless communication system and apparatus therefor

An NR (New Radio Access Technology) terminal in a wireless communication system, comprising:

• an RF (radio frequency) unit;
• and
• a processor connected with the RF unit, the processor configured to:
• control the RF unit to receive a PDCCH (Physical Downlink Control Channel) order on a downlink carrier, and
• control the RF unit to transmit a random access preamble in response to the PDCCH order,
• wherein the random access preamble is transmitted on a first uplink carrier determined based on information on an uplink carrier included in the PDCCH order when a predetermined condition is satisfied,
• wherein the predetermined condition comprises a plurality of uplink carrier including the first uplink carrier are configured for the downlink carrier, and
• wherein a cell ID (Identification) of the downlink carrier and a cell ID of the plurality of uplink carrier are identical.