Method and apparatus for competition-based transmitting of uplink data in wireless communication system to which non-orthogonal multiple access scheme is applied

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

• a transceiver transmitting and receiving a radio signal;
• and
• a processor operatively coupled to the transceiver,
• wherein the processor is configured to:
• receive, from a base station, information on a predefined modulation pattern for a non-orthogonal multiple access scheme,
• wherein the information on the predefined modulation pattern includes modulation pattern indices;
• select a modulation pattern index for the UE from the modulation pattern indices;
• and
• transmit data to the base station through a resource allocated to the multiple UEs based on the selected modulation pattern index,
• wherein the resource is overlapped in a time domain and a frequency domain for the multiple UEs based on the non-orthogonal multiple access scheme and includes a plurality of resource elements,
• wherein the selected modulation pattern index includes information on a modulation order for the plurality of resource elements for the UE,
• wherein the data is modulated by the modulation order for the plurality of resource elements for the UE and is transmitted through the plurality of resource elements,
• wherein a modulation order for the plurality of resource elements for the multiple UEs varies in a UE-specific manner, and
• wherein all data transmitted by the multiple UEs through the plurality of resource elements have a same data rate.