Method for transmitting or receiving signals in wireless communication system and apparatus therefor

A method of receiving a contention-based uplink (UL) transmission signal by a base station (B S) in a wireless communication system, the method comprising:

• detecting a demodulation reference signal (DMRS) of a user equipment (UE) among a plurality of DMRSs through blind detection in a contention resource region for contention-based UL transmission;
• detecting a codeword of the UE among a plurality of codewords in the contention resource region using the detected DMRS;
• and
• decoding UL data corresponding to the decoded codeword,
• wherein the DMRS is received based on an orthogonal multiple access (OMA) scheme and the UL data is received based on a non-orthogonal multiple access (NOMA) scheme,
• the detected DMRS is one of ‘K’ DMRSs mapped to the detected codeword, ‘K’ being an integer equal to or greater than 1, which is changed based on a DMRS collision occurring in the contention resource region.

A user equipment (UE) for performing contention-based uplink (UL) transmission in a wireless communication system, the UE comprising:

• a processor configured to select any one of a plurality of codewords and any one of a plurality of demodulation reference signals (DMRSs), configured in a contention resource region for contention-based UL transmission;
• and
• a transmitter configured to transmit the selected DMRS and UL data corresponding to the selected codeword through the contention resource region, based on control of the processor,
• wherein the DMRS is transmitted based on an orthogonal multiple access (OMA) scheme and the UL data is transmitted based on a non-orthogonal multiple access (NOMA) scheme, and
• the selected DMRS is one of ‘K’ DMRSs mapped to the selected codeword, ‘K’ being an integer equal to or greater than 1, which is changed based on a DMRS collision occurring in the contention resource region.