Granted Patent B2

US 12,647,214 · App. 18/500,021 · Granted Jun 2, 2026

Inventor: Seon Ae Kim (Daejeon, KR)

Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

H04L1/1816H04L5/0055H04W72/40

Abstract

Claims (44)

1 . A method of a first terminal, the method comprising:

transmitting first sidelink control information (SCI) to a second terminal and a third terminal;

transmitting a first transport block (TB) to the second terminal and the third terminal based on scheduling by the first SCI;

receiving a hybrid automatic repeat request (HARQ) feedback including negative acknowledgment (NACK) information for the first TB through a first physical sidelink feedback channel (PSFCH) resource, the first PSFCH resource being determined based on a distance between the first terminal and each of the second terminal and the third terminal;

determining whether NACK information for at least one terminal among the second terminal and the third terminal has been received, based on the HARQ feedback;

detecting the distance of each of the second terminal and the third terminal with respect to the first terminal based on the first PSFCH resource;

identifying at least one retransmission target terminal among the second terminal and the third terminal based on the distance; and

retransmitting the first TB to the at least one retransmission target terminal.

2 . The method according to claim 1 , wherein the first terminal, the second terminal, and the third terminal each perform sidelink (SL) communication in a NACK-based groupcast scheme, and the second terminal and the third terminal are located within a required communication range of the first terminal.

3 . The method according to claim 1 , wherein the first PSFCH resource includes at least one of an automatic gain control (AGC) symbol or a PSFCH symbol.

4 . The method according to claim 1 , wherein the at least one retransmission target terminal is further identified based on direction information of each of the second terminal and the third terminal with respect to the first terminal.

5 . The method according to claim 1 , wherein the retransmitting of the first TB comprises:

transmitting second SCI to the at least one retransmission target terminal; and

retransmitting the first TB to the at least one retransmission target terminal based on scheduling by the second SCI.

6 . The method according to claim 4 , wherein a plurality of preconfigured direction information are determined based on a resolution or a number of beams in beamforming of the first terminal.

7 . A method for a second terminal, comprising:

receiving first sidelink control information (SCI) including location information of a first terminal from the first terminal;

receiving a first transport block (TB) from the first terminal based on scheduling by the first SCI;

determining whether to transmit negative acknowledgment (NACK) information for the first TB;

determining a distance between the first terminal and the second terminal based on a zone ID of the first terminal and a zone ID of the second terminal;

determining a first physical sidelink feedback channel (PSFCH) resource based on the distance;

transmitting, to the first terminal, a hybrid automatic repeat request (HARQ) feedback including the NACK information through the first PSFCH resource; and

receiving the first TB retransmitted from the first terminal,

wherein the distance is determined based on the location information of the first terminal and location information of the second terminal.

8 . The method according to claim 7 , wherein sidelink (SL) communication between the first terminal and the second terminal is indicated by the first SCI to be performed in a NACK-based groupcast scheme, the second terminal is located within a required communication range of the first terminal, and the required communication range is indicated by the first SCI.

9 . The method according to claim 7 , wherein the first PSFCH resource includes at least one of an automatic gain control (AGC) symbol or a PSFCH symbol.

10 . The method according to claim 7 , wherein the HARQ feedback is further transmitted based on direction information between the first terminal and the second terminal, the direction information being determined based on the location information of the first terminal and the location information of the second terminal.

11 . The method according to claim 7 , wherein the receiving of the retransmitted first TB comprises:

receiving second SCI from the first terminal; and

receiving the retransmitted first TB based on scheduling by the second SCI.

12 . The method according to claim 10 , wherein the distance is one of a plurality of preconfigured distances and the direction is one of a plurality of preconfigured direction information.

13 . The method according to claim 12 , wherein the plurality of preconfigured direction information are determined based on a resolution or a number of beams in beamforming of the first terminal.

14 . A first terminal comprising at least one processor, wherein the at least one processor causes the first terminal to perform:

transmitting first sidelink control information (SCI) to a second terminal and a third terminal;

transmitting a first transport block (TB) to the second terminal and the third terminal based on scheduling by the first SCI;

receiving a hybrid automatic repeat request (HARQ) feedback including negative acknowledgment (NACK) information for the first TB through a first physical sidelink feedback channel (PSFCH) resource, the first PSFCH resource being determined based on a distance between the first terminal and each of the second terminal and the third terminal;

determining whether NACK information for at least one terminal among the second terminal and the third terminal has been received, based on the HARQ feedback;

detecting the distance of each of the second terminal and the third terminal with respect to the first terminal based on the first PSFCH resource;

identifying at least one retransmission target terminal among the second terminal and the third terminal based on the distance; and

retransmitting the first TB to the at least one retransmission target terminal.

15 . The first terminal according to claim 14 , wherein the first terminal, the second terminal, and the third terminal each perform sidelink (SL) communication in a NACK-based groupcast scheme, and the second terminal and the third terminal are located within a required communication range of the first terminal.

16 . The first terminal according to claim 14 , wherein the first PSFCH resource includes at least one of an automatic gain control (AGC) symbol or a PSFCH symbol.

17 . The first terminal according to claim 14 , wherein the at least one retransmission target terminal is further identified based on direction information of each of the second terminal and the third terminal with respect to the first terminal.

18 . The first terminal according to claim 17 , wherein a plurality of preconfigured direction information are determined based on a resolution or a number of beams in beamforming of the first terminal.

Assignments (1)

Priority Claims (2)

Continuity (1)

References Cited (13)