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

1. A method of transmitting contention-based data by a user equipment (UE), among multiple UEs in a wireless communication system, the method comprising:

receiving, 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,

selecting a modulation pattern index for the UE from the modulation pattern indices; and

transmitting 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.

2. The method of claim 1 , wherein the selected modulation pattern index further includes information on that that a specific resource element in the resource is nulled in a UE-specific manner.

3. The method of claim 1 , wherein the selected modulation pattern index is pre-determined between the base station and the UE and is received through radio resource control (RRC) signaling.

4. The method of claim 1 , further comprising:

receiving information on a predefined coding rate pattern for the non-orthogonal multiple access scheme from the base station,

wherein the information on the predefined coding rate pattern includes coding rate pattern indices, and the coding rate pattern indices include information on that a coding rate is designated in a UE-specific manner for each resource element in a resource used by multiple UEs in an overlapping manner; and

selecting a coding rate pattern index for the UE from the coding rate pattern indices,

wherein the data is encoded by a coding rate designated for each of the resource elements indicated by the selected coding rate pattern index.

5. The method of claim 4 , further comprising

receiving information on a predefined codeword for the non-orthogonal multiple access scheme from the base station,

wherein the selected modulation pattern index is designated based on an index of the predefined codeword, and

wherein the selected coding rate pattern index is designated based on the index of the predefined codeword.

6. 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.

7. The UE of claim 6 , wherein the selected modulation pattern index further includes information on that that a specific resource element by the multiple UEs is nulled in a UE-specific manner.

8. The UE of claim 6 , wherein the selected modulation pattern index is pre-determined between the base station and the UE and is received through radio resource control (RRC) signaling.

9. The UE of claim 6 , wherein the processor is configured to:

receive information on a predefined coding rate pattern for the non-orthogonal multiple access scheme from the base station,

wherein the information on the predefined coding rate pattern includes coding rate pattern indices, and the coding rate pattern indices include information on that a coding rate is designated in a UE-specific manner for each resource element in a resource used by multiple UEs in an overlapping manner; and

select a coding rate pattern index for the UE from the coding rate pattern indices,

wherein the data is encoded by a coding rate designated for each of the resource elements indicated by the selected coding rate pattern index.

10. The UE of claim 9 , wherein the processor is configured to

receive information on a predefined codeword for the non-orthogonal multiple access scheme from the base station,

wherein the selected modulation pattern index is designated based on an index of the predefined codeword, and

wherein the selected coding rate pattern index is designated based on the index of the predefined codeword.