NCMA-based uplink communication method and device therefor

• US 10,736,134 B2
• Filed: 04/12/2017
• Issued: 08/04/2020
• Est. Priority Date: 04/19/2016
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Hojae, Lee, Sangrim, Kim, Dongkyu, Noh, Kwangseok
• Primary Examiner(s): Magloire, Elisabeth Benoit
• Application Number:
  US16/095,113
• Publication Number:
  US 20190124681A1
• Time in Patent Office: 1,210 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 27/2634 Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Techniques for a user equipment to perform uplink communication in a wireless communication system. The user equipment performs operations that include: receiving configuration information for a codebook set related with a modulation scheme; receiving a UL grant including a specific codeword index; selecting a codebook based on the specific codeword index included in the codebook set; and transmitting data based on the selected codebook, wherein the codebook set includes a plurality of codebooks predefined for non-orthogonal coded multiple access (NCMA) scheme based communication, and wherein the codebook set is configured based on a spreading factor or an overloading factor.

Claims

1. A method for performing uplink communication by a user equipment (UE) operating in a wireless communication system, the method comprising:

receiving configuration information for a codebook set related with a modulation scheme;

receiving a UL grant comprising a specific codeword index;

selecting a codebook based on the specific codeword index included in the codebook set and

transmitting data based on the selected codebook,

wherein the codebook set comprises a plurality of codebooks that are predefined for non-orthogonal coded multiple access (NCMA) based communication, and

wherein the codebook set is configured based on a spreading factor or an overloading factor.

2. The method of claim 1, further comprising:

performing resource mapping after applying the selected codeword to encoded bits.

3. The method of claim 2, wherein transmitting the data further includes:

performing Inverse Fast Fourier Transform (IFFT) after performing the resource mapping; and

transmitting a signal that is transformed by the IFFT.

4. The method of claim 1, wherein the codebook corresponds to a specific codebook in a codebook set defined for the NCMA based communication.

5. The method of claim 1, wherein the codebook is a codebook defined considering a symbol size.

6. The method of claim 1, wherein the modulation scheme includes a modulation order.

7. The method of claim 2, wherein the NCMA based communication scheme is a non-contention based communication scheme.

8. A user equipment (UE) configured to perform uplink communication in a wireless communication system, the UE comprising:

a receiver and a transmitter;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising;

receiving, through the receiver, configuration information for a codebook set related with a modulation scheme;

receiving, through the receiver, a UL grant comprising a specific codeword index;

selecting a codebook based on the specific codeword index included in the codebook set and

transmitting, through the transmitter, data based on the selected codebook,

wherein the codebook set comprises a plurality of codebooks that are predefined for non-orthogonal coded multiple access (NCMA) based communication, and

wherein the codebook set is configured based on a spreading factor or an overloading factor.

9. The UE of claim 8, where the operations further comprise:

performing resource mapping after applying the selected codeword to bits encoded for the communication.

10. The UE of claim 9, wherein the operations further comprise:

performing Inverse Fast Fourier Transform (IFFT) after performing the resource mapping, and

transmitting, through the transmitter, a signal that is transformed by the IFFT.

11. The UE of claim 9, wherein the codebook corresponds to a specific codebook in a codebook set defined for the NCMA based communication.

12. The UE of claim 9, wherein the modulation scheme includes a modulation order.