Granted Patent B2

US 12,483,356 · App. 17/934,208 · Granted Nov 25, 2025

Inventor: Ki Bum Kwon (Seoul, KR)

Assignee: Innovative Technology Lab Co., Ltd.

H04L1/1812H04W72/1263H04W72/23H04W76/28H04W92/18

Abstract

Claims (71)

1 . A method comprising:

receiving, by a first wireless user device from a second wireless user device, sidelink hybrid automatic repeat request (HARQ) feedback information associated with sidelink data that is transmitted from the first wireless user device to the second wireless user device;

transmitting, by the first wireless user device to a base station, a sidelink HARQ negative acknowledgment (NACK) associated with the sidelink HARQ feedback information;

starting, in a symbol after an end of a transmission of the HARQ NACK, a first timer;

starting, in a symbol after an expiry of the first timer, a second timer; and

during a discontinuous reception (DRX) active time and while the second timer is running, receiving, from the base station via a downlink control channel, an indication of a sidelink data retransmission,

wherein the symbol after the end of the transmission of the HARQ NACK is symbol ‘n+1’ that immediately follows symbol ‘n’ in which the transmission of the HARQ NACK ends, and

wherein the symbol after the expiry of the first timer is symbol ‘m+1’ that immediately follows symbol ‘m’ in which the expiry of the first timer occurs.

2 . The method of claim 1 , wherein a physical uplink control channel (PUCCH) resource is configured for the sidelink HARQ NACK, and

wherein the transmitting the sidelink HARQ NACK comprises transmitting the sidelink HARQ NACK via the PUCCH resource.

3 . The method of claim 1 , further comprising operating the DRX active time during the second timer is running.

4 . The method of claim 1 , further comprising:

after the expiry of the first timer, transitioning, by the first wireless user device, to the DRX active time, wherein the first wireless user device is in a DRX inactive time while the first timer is running.

5 . The method of claim 1 , further comprising:

receiving, by the first wireless user device from the base station, an initial sidelink grant via a downlink control channel; and

transmitting, by the first wireless user device to the second wireless user device:

sidelink scheduling information via a sidelink control channel; and

the sidelink data via a sidelink shared channel,

wherein the sidelink HARQ feedback information indicates a sidelink HARQ NACK.

6 . The method of claim 1 , further comprising:

receiving, by the first wireless user device from the base station, DRX configuration information, wherein the DRX configuration information comprises:

the first timer;

the second timer;

a DRX cycle;

a DRX on-duration timer; and

a DRX inactivity timer.

7 . The method of claim 1 , wherein the first timer is associated with a DRX HARQ round trip time for a sidelink HARQ process, and

wherein the second timer is associated with a DRX retransmission time for the sidelink HARQ process.

8 . The method of claim 1 , further comprising stopping the second timer after starting the first timer.

9 . The method of claim 1 , further comprising:

receiving, by the first wireless user device from the base station, a sidelink grant via a downlink control channel scrambled based on a sidelink-radio network temporary identifier (SL-RNTI), wherein the sidelink grant indicates a transmission of the sidelink data, and wherein a sidelink HARQ process is associated with:

the sidelink data;

the first timer; and

the second timer.

10 . A first wireless user device comprising:

an antenna;

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the first wireless user device to:

receive, from a second wireless user device, sidelink hybrid automatic repeat request (HARQ) feedback information associated with sidelink data that is transmitted from the first wireless user device to the second wireless user device;

transmit, to a base station, a sidelink HARQ negative acknowledgment (NACK) associated with the sidelink HARQ feedback information;

start, in a symbol after an end of a transmission of the HARQ NACK, a first timer;

start, in a symbol after an expiry of the first timer, a second timer; and

during a discontinuous reception (DRX) active time and while the second timer is running, receive, from the base station via a downlink control channel, an indication of a sidelink data retransmission,

wherein the symbol after the end of the transmission of the HARQ NACK is symbol ‘n+1’ that immediately follows symbol ‘n’ in which the transmission of the HARQ NACK ends, and

wherein the symbol after the expiry of the first timer is symbol ‘m+1’ that immediately follows symbol ‘m’ in which the expiry of the first timer occurs.

11 . The first wireless user device of claim 10 , wherein a physical uplink control channel (PUCCH) resource is configured for the sidelink HARQ NACK, and

wherein the instructions, when executed by the one or more processors, cause the first wireless user device to transmit the sidelink HARQ NACK by transmitting the sidelink HARQ NACK via the PUCCH resource.

12 . The first wireless user device of claim 10 , wherein the instructions, when executed by the one or more processors, cause the first wireless user device to operate the DRX active time during the second timer is running.

13 . The first wireless user device of claim 10 , wherein the instructions, when executed by the one or more processors, cause the first wireless user device to:

after the expiry of the first timer, transition to the DRX active time, wherein the first wireless user device is in a DRX inactive time while the first timer is running.

14 . The first wireless user device of claim 10 , wherein the instructions, when executed by the one or more processors, cause the first wireless user device to:

receive, from the base station, an initial sidelink grant via a downlink control channel; and

transmit, to the second wireless user device:

sidelink scheduling information via a sidelink control channel; and

the sidelink data via a sidelink shared channel,

wherein the sidelink HARQ feedback information indicates a sidelink HARQ NACK.

15 . The first wireless user device of claim 10 , wherein the instructions, when executed by the one or more processors, cause the first wireless user device to:

receive, from the base station, DRX configuration information, wherein the DRX configuration information comprises:

the first timer;

the second timer;

a DRX cycle;

a DRX on-duration timer; and

a DRX inactivity timer.

16 . The first wireless user device of claim 10 , wherein the first timer is associated with a DRX HARQ round trip time for a sidelink HARQ process, and

wherein the second timer is associated with a DRX retransmission time for the sidelink HARQ process.

17 . The first wireless user device of claim 10 , wherein the instructions, when executed by the one or more processors, cause the first wireless user device to stop the second timer after starting the first timer.

18 . The first wireless user device of claim 10 , wherein the instructions, when executed by the one or more processors, cause the first wireless user device to:

receive, from the base station, a sidelink grant via a downlink control channel scrambled based on a sidelink-radio network temporary identifier (SL-RNTI), wherein the sidelink grant indicates a transmission of the sidelink data, and wherein a sidelink HARQ process is associated with:

the sidelink data;

the first timer; and

the second timer.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (19)