# US 11,122,645 B2 · Systems and methods for constellation superposition

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- Number: US 11,122,645 B2
- Document ID: US11122645B2
- Status: Granted
- Kind: B2
- Application number: 15/927,836
- Filed: 2018-03-21
- Published: 2018-07-26
- Granted: 2021-09-14
- Earliest claimed: 2015-04-16
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: John Michael Kowalski; Zhanping Yin; Toshizo Nogami; Jia Sheng
- Web page: https://patentgrep.com/patent/US11122645B2

## CPC

- H03M 13/2707: {Simple row-column interleaver, i.e. pure block interleaving}
- H03M 13/353: {Adaptation to the channel}
- H04J 11/004: {using regenerative subtractive interference cancellation}
- H04L 1/0042: {Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape (H04L1/0067 takes precedence)}
- H04L 1/0048: {in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder (for spatial equalizer H04L25/03286)}
- H04L 27/3488: {Multiresolution systems}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 76/27: Transitions between radio resource control [RRC] states
- H03M 13/09: Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
- H03M 13/23: using convolutional codes, e.g. unit memory codes
- H03M 13/2957: {Turbo codes and decoding}
- H04L 1/0025: {Transmission of mode-switching indication}
- H04L 27/2634: {Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation}
- H04L 2001/0093: {Point-to-multipoint}
- H04W 52/143: {Downlink power control}
- H04W 52/346: {distributing total power among users or channels}
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method for performing constellation superposition by an evolved Node B (eNB) includes determining an admissible data constellation for a second user equipment (UE) based on a data constellation of a first UE. The first UE and the second UE share the same time-frequency resources. The method also includes sending an indication that superposition coded modulation is being employed by the first UE and the second UE. The method further includes sending modulation and coding schemes (MCSs) and/or transmission power percentages used by each of the first UE and the second UE to the other UE.

## Claims

### Claim 1

A user equipment (UE) comprising:
physical downlink control channel (PDCCH) receiving circuitry configured to receive a PDCCH with a downlink control information (DCI) format; and
physical downlink shared channel (PDSCH) receiving circuitry configured to receive a 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.

### Claim 2 (depends on 1)

The UE according to claim 1, wherein based on the values and the modulation scheme, the UE demodulates the PDSCH as the UE's own received data.

### Claim 3 (depends on 1)

The UE according to claim 1, wherein in a case that the 2-bit information field is set to ‘00’, correspondence between values indicated by the 2-bit information field and power ratios does not depend on the modulation scheme.

### Claim 4 (depends on 3)

The UE according to claim 3, wherein based on the values and the modulation scheme, the UE demodulates the PDSCH as the UE's own received data.

### Claim 5 (depends on 1)

The UE according to claim 1, wherein in a case that the 2-bit information field is set to ‘00’, the UE assumes that MUST interference is not present.

### Claim 6

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.

### Claim 7 (depends on 6)

The eNB according to claim 6, wherein in a case that the 2-bit information field is set to ‘00’, correspondence between values indicated by the 2-bit information field and power ratios does not depend on the modulation scheme.

### Claim 8 (depends on 6)

The eNB according to claim 6, wherein in a case that the 2-bit information field is set to ‘00’, the eNB does not perform MUST multiplexing.

### Claim 9

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.

### Claim 10 (depends on 9)

The method according to claim 9, wherein in a case that the 2-bit information field is set to ‘00’, correspondence between values indicated by the 2-bit information field and power ratios does not depend on the modulation scheme.

### Claim 11

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.

### Claim 12 (depends on 11)

The method according to claim 11, wherein in a case that the 2-bit information field is set to ‘00’, correspondence between values indicated by the 2-bit information field and power ratios does not depend on the modulation scheme.