NOMA SCHEME DATA RECEIVING METHOD AND USER EQUIPMENT

• US 20170310417A1
• Filed: 11/03/2015
• Published: 10/26/2017
• Est. Priority Date: 11/04/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: JUNG, Manyoung, KIM, Bonghoe, SEO, Hanbyul
• Granted Patent: US 10,396,930 B2
• Time in Patent Office: Days
• CPC Class Codes: H04J 11/004 using regenerative subtractive interference cancellation
• CPC Class Codes: H04J 99/00 Subject matter not provided for in other groups of this subclass
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0039 other detection of signalling, e.g. detection of TFCI explicit signalling H04L1/0046, H04L27/0012 and H04L25/0262 take precedence
• CPC Class Codes: H04L 1/0056 Systems characterized by the type of code used H04L1/08 takes precedence
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A non-orthogonal multiple access (NOMA) scheme data receiving method is provided. The method can comprise the steps of: receiving, by a user equipment (UE), downlink control information (DCI) for a NOMA scheme; receiving downlink data on the basis of the DCI; decoding interference data included in the received downlink data; cancelling decoded interference data in the received downlink data if the decoding is successful; and decoding the own downlink data remaining after the interference data has been cancelled.

Claims

1. A method of receiving data using a Non-Orthogonal Multiple Access (NOMA) scheme, the method comprising:

receiving, by a user equipment (UE), downlink control information (DCI) for a NOMA scheme;

receiving downlink data based on the DCI;

decoding interference data included in the received downlink data;

cancelling the decoded interference data from the received downlink data, when the decoding is succeeded; and

decoding the remaining downlink data after the interference data have been cancelled.

2. The method of claim 1, further comprising:

transmitting uplink control information (UCI) comprising hybrid automatic repeat request (HARQ) ACK/NACK of the interference data and HARQ ACK/NACK of the downlink data, when decoding of the downlink data is succeeded.

3. The method of claim 1, wherein the DCI comprises downlink resource allocation information for receiving the downlink data and information about HARQ ACK/NACK on whether an interference UE, which is an owner of the interference data has previously performed successful reception.

4. The method of claim 3, further comprising:

flushing a HARQ buffer for interference data, if an interference UE, which is an owner of the interference data has previously performed successful reception based on the DCI; and

storing the decoded interference data within a HARQ buffer for the interference data.

5. The method of claim 1, further comprising:

determining, by the user equipment, whether the interference data were previously successfully received, because the interference data have been retransmitted, if an interference UE, which is an owner of the interference data has not previously performed successful reception based on the DCI,

wherein the decoding of interference data is performed even when an interference UE, which is an owner of the interference data has not previously performed successful reception and even when the user equipment has not previously successfully received the interference data.

6. The method of claim 1, further comprising:

determining, by the user equipment, whether the interference data were previously successfully received, because the interference data have been retransmitted, if an interference UE, which is an owner of the interference data has not previously performed successful reception based on the DCI;

generating a hard bit using the previously successfully received interference data, when an interference UE, which is an owner of the interference data has not previously performed successful reception, but when the user equipment has previously successfully received the interference data; and

cancelling the interference data included in the received downlink data based on the generated hard bit.

7. A user equipment that performs data reception of a Non-Orthogonal Multiple Access (NOMA) scheme, the user equipment comprising:

a radio frequency (RF) unit; and

a processor that controls the RF unit,

wherein the processor receives downlink control information (DCI) for a NOMA scheme, receives downlink data based on the DCI, decodes interference data included in the received downlink data, cancels the decoded interference data from the received downlink data, when the decoding is succeeded, and decodes the remaining downlink data after the interference data have been cancelled.

8. The user equipment of claim 7, wherein the processor transmits uplink control information (UCI) comprising Hybrid automatic repeat request (HARQ) ACK/NACK of the interference data and HARQ ACK/NACK of the downlink data, when decoding of the downlink data is succeeded.

9. The user equipment of claim 7, wherein the DCI comprises downlink resource allocation information for receiving the downlink data and information about HARQ ACK/NACK on whether an interference UE, which is an owner of the interference data has previously performed successful reception.