Method and device for transmitting and receiving signal by using time offset in time-asynchronous non-orthogonal multiple access system

Patent metadata

Field	Value
Publication number	US-12445329-B2
Application number	US-202218577199-A
Country	US
Kind code	B2
Filing date	Jul 8, 2022
Priority date	Jul 8, 2021
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate than a 4G system such as LTE. A method in which a base station transmits a signal by using a time offset in a time-asynchronous non-orthogonal multiple access (TA-NOMA) system, according to an embodiment of the present disclosure, comprises the steps of: checking a first bit stream for a first terminal, and a second bit stream for a second terminal; determining a time offset for the second terminal on the basis of the number of terminals operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system; and transmitting a first signal corresponding to the first bit stream and a second signal corresponding to the second bit stream on resources that are allocated based on the time offset.

First claim

The invention claimed is:

1. A method for transmitting a signal using a time offset by a base station in a time-asynchronous nonorthogonal multiple access (TA-NOMA) system, the method comprising:
identifying a first bit stream for a first user equipment (UE) and a second bit stream for a second UE;
determining a time offset for the second UE based on a number of UEs operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system; and
transmitting, on a resource allocated based on the time offset, a first signal corresponding to the first bit stream and a second signal corresponding to the second bit stream.

2. The method of claim 1 , wherein determining the time offset includes:
identifying information about a plurality of time offsets predetermined according to the number of the UEs and the pulse shape; and
determining the time offset for the second UE based on information about the plurality of time offsets.

3. The method of claim 1 , further comprising:
configuring a pre-coding matrix in a block unit to be used in the base station based on the time offset; and
configuring a post-coding matrix in a block unit to be used in the first UE and the second UE based on the time offset.

4. The method of claim 3 , further comprising:
allocating a resource in a symbol unit for each of the first UE and the second UE based on the pre-coding matrix and the post-coding matrix.

5. The method of claim 1 , further comprising:
broadcasting at least one of the time offset for the second UE, a number of symbols per block, and index information about a precoding matrix predetermined between the base station and the UEs.

6. A method for receiving a signal using a time offset by a UE in a time-asynchronous nonorthogonal multiple access (TA-NOMA) system, the method comprising:
receiving, from a base station, a first signal for another UE and a second signal for the UE;
performing sampling on the first signal and the second signal to identify a time offset set for the second signal; and
obtaining a bit stream corresponding to the second signal based on a result of the sampling,
wherein the time offset is determined based on a number of UEs operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system.

7. The method of claim 6 , wherein the time offset for the UE is determined based on information about a plurality of time offsets predetermined according to the number of the UEs and the pulse shape.

8. The method of claim 6 , wherein a pre-coding matrix in a block unit to be used in the base station is configured based on the time offset, and
wherein a post-coding matrix in a block unit to be used in the UE is configured based on the time offset.

9. The method of claim 8 , wherein a resource in a symbol unit is allocated for the UE based on the pre-coding matrix and the post-coding matrix.

10. The method of claim 6 , further comprising:
receiving, from the base station, at least one of the time offset for the UE, a number of symbols per block, and index information about a precoding matrix predetermined between the base station and the UEs.

11. A base station transmitting a signal using a time offset in a time-asynchronous nonorthogonal multiple access (TA-NOMA) system, comprising:
a transceiver; and
a controller coupled with the transceiver and configured to control to:
identify a first bit stream for a first user equipment (UE) and a second bit stream for a second UE;
determine a time offset for the second UE based on a number of UEs operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system; and
transmit a first signal corresponding to the first bit stream and a second signal corresponding to the second bit stream on a resource allocated based on the time offset.

12. The base station of claim 11 , wherein the controller is configured to:
identify information about a plurality of time offsets predetermined according to the number of the UEs and the pulse shape; and
determine the time offset for the second UE based on information about the plurality of time offsets.

13. The base station of claim 11 , wherein the controller is configured to:
configure a pre-coding matrix in a block unit to be used in the base station based on the time offset; and
configure a post-coding matrix in a block unit to be used in the first UE and the second UE based on the time offset.

14. A UE receiving a signal using a time offset in a time-asynchronous nonorthogonal multiple access (TA-NOMA) system, comprising:
a transceiver; and
a controller coupled with the transceiver and configured to control to:
receive, from a base station, a first signal for another UE and a second signal for the UE;
perform sampling on the first signal and the second signal to identify a time offset set for the second signal; and
obtain a bit stream corresponding to the second signal based on a result of the sampling,
wherein the time offset is determined based on a number of UEs operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system.

15. The UE of claim 14 , wherein the time offset for the UE is determined based on information about a plurality of time offsets predetermined according to the number of the UEs and the pulse shape.

Assignees

• Samsung Electronics Co Ltd
• Uif Univ Industry Foundation Yonsei Univ

Inventors

• Lee Kwonjong
• Lee Seunghyun
• Lee Hakkeon
• Hong Daesik
• Son Joohyun
• Jung Insik

Classifications

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04J99/00

  Subject matter not provided for in other groups of this subclass · CPC title

• H04L25/03834 Primary

  using pulse shaping · CPC title

• H04L25/03343

  Arrangements at the transmitter end · CPC title