Systems and methods for constellation superposition

An evolved node B (eNB) communicating with a user equipment (UE), the eNB comprising:

• physical downlink control channel (PDCCH) transmitting circuitry configured to transmit the PDCCH with a downlink control information (DCI) format;
• and
• physical downlink shared channel (PDSCH) transmitting circuitry configured to transmit a PDSCH;
• wherein
• the DCI format has a 5-bit information field and a 2-bit information field in which the 5-bit information field indicates one of at least a first modulation scheme and a second modulation scheme of the UE, the 2-bit information field indicates multiuser superposition transmission (MUST) interference presence and power ratio, and the power ratio is a ratio of power of the UE,
• in a case that the 2-bit information field is not set to ‘00’ and the 5-bit information field indicates the first modulation scheme, a first table is used for determining the power ratio, the first table including a value ‘01’ set by the 2-bit information field, a value ‘10’ set by the 2-bit information field, a value ‘11’ set by the 2-bit information field, a first power ratio corresponding to the value ‘01’, a second power ratio corresponding to the value ‘10’ and a third power ratio corresponding to the value ‘11’, and
• in a case that the 2-bit information field is not set to ‘00’ and the 5-bit information field indicates the second modulation scheme, a second table is used for determining the power ratio, the second table including the value ‘01’ set by the 2-bit information field, the value ‘10’ set by the 2-bit information field, the value ‘11’ set by the 2-bit information field, a fourth power ratio corresponding to the value ‘01’, a fifth power ratio corresponding to the value ‘10’ and a sixth power ratio corresponding to the value ‘11’, the fourth power ratio being different from the first power ratio, the fifth power ratio being different from the second power ratio, and the sixth power ratio being different from the third power ratio.

A method for a user equipment (UE), the method comprising:

• receiving a physical downlink control channel (PDCCH) with a downlink control information (DCI) format;
• and
• receiving a physical downlink shared channel (PDSCH) upon the detection of the PDCCH;
• wherein
• the DCI format has a 5-bit information field and a 2-bit information field in which the 5-bit information field indicates one of at least a first modulation scheme and a second modulation scheme of the UE, the 2-bit information field indicates multiuser superposition transmission (MUST) interference presence and power ratio, and the power ratio is a ratio of power of the UE,
• in a case that the 2-bit information field is not set to ‘00’ and the 5-bit information field indicates the first modulation scheme, a first table is used for determining the power ratio, the first table including a value ‘01’ set by the 2-bit information field, a value ‘10’ set by the 2-bit information field, a value ‘11’ set by the 2-bit information field, a first power ratio corresponding to the value ‘01’, a second power ratio corresponding to the value ‘10’ and a third power ratio corresponding to the value ‘11’, and
• in a case that the 2-bit information field is not set to ‘00’ and the 5-bit information field indicates the second modulation scheme, a second table is used for determining the power ratio, the second table including the value ‘01’ set by the 2-bit information field, the value ‘10’ set by the 2-bit information field, the value ‘11’ set by the 2-bit information field, a fourth power ratio corresponding to the value ‘01’, a fifth power ratio corresponding to the value ‘10’ and a sixth power ratio corresponding to the value ‘11’, the fourth power ratio being different from the first power ratio, the fifth power ratio being different from the second power ratio, and the sixth power ratio being different from the third power ratio.

A method for an evolved node B (eNB) communicating with a user equipment (UE), the eNB comprising:

• transmitting a physical downlink control channel (PDCCH) with a downlink control information (DCI) format;
• and
• transmitting a physical downlink shared channel (PDSCH) upon the detection of the PDCCH;
• wherein
• the DCI format has a 5-bit information field and a 2-bit information field in which the 5-bit information field indicates one of at least a first modulation scheme and a second modulation scheme of the UE, the 2-bit information field indicates multiuser superposition transmission (MUST) interference presence and power ratio, and the power ratio is a ratio of power of the UE,
• in a case that the 2-bit information field is not set to ‘00’ and the 5-bit information field indicates the first modulation scheme, a first table is used for determining the power ratio, the first table including a value ‘01’ set by the 2-bit information field, a value ‘10’ set by the 2-bit information field, a value ‘11’ set by the 2-bit information field, a first power ratio corresponding to the value ‘01’, a second power ratio corresponding to the value ‘10’, and a third power ratio corresponding to the value ‘11’, and
• in a case that the 2-bit information field is not set to ‘00’ and the 5-bit information field indicates the second modulation scheme, a second table is used for determining the power ratio, the second table including the value ‘01’ set by the 2-bit information field, the value ‘10’ set by the 2-bit information field, the value ‘11’ set by the 2-bit information field, a fourth power ratio corresponding to the value ‘01’, a fifth power ratio corresponding to the value ‘10’, and a sixth power ratio corresponding to the value ‘11’, the fourth power ratio being different from the first power ratio, the fifth power ratio being different from the second power ratio, and the sixth power ratio being different from the third power ratio.