Systems and methods for constellation superposition

Patent metadata

Field	Value
Publication number	US-2016309542-A1
Application number	US-201615099569-A
Country	US
Kind code	A1
Filing date	Apr 14, 2016
Priority date	Apr 16, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

A method for performing constellation superposition by an evolved Node B (eNB) is described. The method 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.

First claim

What is claimed is:

1 . A method for performing constellation superposition by an evolved Node B (eNB), comprising:
determining an admissible data constellation for a second user equipment (UE) based on a data constellation of a first UE, wherein the first UE and the second UE share the same time-frequency resources; sending an indication that superposition coded modulation is being employed by the first UE and the second UE; and 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.

2 . The method of claim 1 , wherein determining an admissible data constellation for the second UE based on a data constellation of a first UE comprises selecting a data constellation for the second UE that is greater than or equal to a data constellation cardinality of the first UE.

3 . The method of claim 1 , wherein sending an indication that superposition coded modulation is being employed by the first UE and the second UE comprises sending an indication that the first UE and the second UE are participating in superposition coded modulation using radio resource control (RRC) signaling.

4 . The method of claim 1 , wherein sending an indication that superposition coded modulation is being employed by the first UE and the second UE comprises sending a downlink control information (DCI) format whose purpose is to toggle successive interference canceller (SIC) receiving and to indicate that data modulation symbols are superposition coded.

5 . The method of claim 1 , wherein sending an indication that superposition coded modulation is being employed by the first UE and the second UE comprises sending a DCI format 1, 1A, 1B, 1D, 2, 2A, 2B, or 2C with an indicator that superposition coding is employed.

6 . The method of claim 1 , further comprising sending the data constellation for the second UE to the first UE using RRC signaling.

7 . The method of claim 1 , further comprising sending the data constellation for the second UE to the first UE using a DCI format.

8 . The method of claim 1 , wherein sending the MCSs and/or the transmission power percentages used by each of the first UE and the second UE to the other UE comprises sending MCS and/or transmission power percentage used by each of the first UE and the second UE to the other UE using RRC signaling.

9 . The method of claim 1 , wherein sending the MCSs and/or the transmission power percentages used by each of the first UE and the second UE to the other UE comprises sending MCS and/or transmission power percentage used by each of the first UE and the second UE to the other UE using a DCI format.

10 . The method of claim 9 , wherein the DCI format is addressable by multiple UEs through transmission of either multiple Radio Network Terminal Identifiers (RNTIs) or a single group RNTI.

11 . The method of claim 10 , wherein the RNTI is configured by RRC signaling.

12 . A method for performing constellation superposition by a first user equipment (UE), comprising:
receiving an indication that superposition coded modulation is being employed by the first UE and a second UE, wherein the first UE and the second UE share the same time-frequency resources, and wherein an admissible data constellation for the second UE is based on a data constellation of the first UE; and receiving modulation and coding schemes (MCSs) and/or transmission power percentages used by each of the first UE and the second UE.

13 . The method of claim 12 , wherein receiving an indication that superposition coded modulation is being employed by the first UE and the second UE comprises receiving an indication that the first UE and the second UE are participating in superposition coded modulation using radio resource control (RRC) signaling.

14 . The method of claim 12 , wherein receiving an indication that superposition coded modulation is being employed by the first UE and the second UE comprises receiving a downlink control information (DCI) format whose purpose is to toggle successive interference canceller (SIC) receiving and to indicate that data modulation symbols are superposition coded.

15 . The method of claim 12 , wherein receiving an indication that superposition coded modulation is being employed by the first UE and the second UE comprises receiving a DCI format 1, 1A, 1B, 1D, 2, 2A, 2B, or 2C with an indicator that superposition coding is employed.

16 . The method of claim 12 , further comprising receiving the data constellation for the second UE at the first UE using RRC signaling.

17 . The method of claim 12 , further comprising receiving the data constellation for the second UE at the first UE using a DCI format.

18 . The method of claim 12 , wherein receiving the MCSs and/or the transmission power percentages used by each of the first UE and the second UE comprises receiving the MCS and/or the transmission power percentage used by each of the first UE and the second UE using RRC signaling.

19 . The method of claim 12 , wherein receiving the MCSs and/or the transmission power percentages used by each of the first UE and the second UE comprises receiving the MCS and/or the transmission power percentage used by each of the first UE and the second using a DCI format.

20 . The method of claim 19 , wherein the DCI format is addressable by multiple UEs through reception of either multiple Radio Network Terminal Identifiers (RNTIs) or a single group RNTI.

21 . The method of claim 20 , wherein the RNTI is configured by RRC signaling.

22 . The method of claim 12 , further comprising performing successive interference canceller (SIC) receiving based on the indication that superposition coded modulation is being employed by the first UE and a second UE.

23 . The method of claim 22 , wherein SIC receiving is enabled and performed using the received MCSs and/or transmission power percentages used by each of the first UE and the second UE to the other UE when superposition coded modulation is indicated to be employed by the first UE and a second UE.

24 . The method of claim 22 , wherein SIC receiving is disabled when superposition coded modulation is indicated to not be employed by the first UE and a second UE.

Assignees

• Sharp Laboratories America Inc

Inventors

• Kowalski John Michael
• Yin Zhanping
• Nogami Toshizo
• Sheng Jia

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W76/046 Primary

  Electricity · mapped topic

• H04W72/042

  Electricity · mapped topic

• H04L27/2634

  Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation · CPC title

• H03M13/2707 Primary

  Simple row-column interleaver, i.e. pure block interleaving · CPC title