Granted Patent B2

US 12,635,032 · App. 18/025,038 · Granted May 19, 2026

Inventors: Hieu Do (Järfälla, SE); Shehzad Ali Ashraf (Aachen, DE); Zhang Zhang (Beijing, CN); Ricardo Blasco Serrano (Espoo, FI); Antonino Orsino (Kirkkonummi, FI); Min Wang (Luleå, SE)

Assignee: Telefonaktiebolaget LM Ericsson (publ)

H04W76/28H04W52/0216

Abstract

Claims (49)

1 . A method of controlling device-to-device (D2D) communication in a wireless communication network, the method comprising:

a wireless communication device determining that a further wireless communication device is configured to switch between an inactive reception state and an active reception state;

performing a D2D transmission from the wireless communication device to the further wireless communication device;

determining when the further wireless communication device will be in the active reception state, based on knowledge at the wireless communication device of a timer triggered at the further wireless communication device by the D2D transmission, wherein the further wireless communication device operates or remains in the active reception state according to the timer;

based on determining when the further wireless communication device will be in the active reception state, the wireless communication device determining a candidate set of radio resources; and

from the candidate set of radio resources, the wireless communication device selecting at least one radio resource for a further D2D transmission from the wireless communication device to the further wireless communication device.

2 . The method according to claim 1 ,

wherein the D2D transmission is a transmission of control signaling.

3 . The method according to claim 2 ,

wherein the control signaling comprises a wakeup signal.

4 . The method according to claim 1 ,

wherein the D2D transmission is a transmission of a scheduling assignment to the further wireless communication device.

5 . The method according to claim 4 ,

wherein the further D2D transmission comprises a D2D transmission scheduled by the scheduling assignment.

6 . The method according to claim 1 ,

wherein the further D2D transmission is a retransmission of the D2D transmission.

7 . The method according to claim 6 ,

wherein the retransmission is triggered based on acknowledgement feedback from the further wireless communication device.

8 . The method according to claim 1 ,

wherein the candidate set of radio resources is based on one or more time intervals when the further wireless communication device will be in the active reception state; and

wherein the timer is a retransmission timer and the further D2D transmission is a retransmission, and wherein the method includes determining the one or more time intervals based on knowledge at the wireless communication device of the duration of the retransmission timer.

9 . The method according to claim 8 , wherein the wireless communication device receives a negative acknowledgment (NACK) from the further wireless communication device in response to the D2D transmission, and wherein the wireless device determines the one or more time intervals based on reception of the NACK and knowledge of when the further wireless communication device starts the retransmission timer in relation to transmission of the NACK.

10 . The method according to claim 1 , wherein the wireless communication device has knowledge of a duration of the timer, with the further wireless communication device being in the active reception state while the timer is running, and has knowledge of a timing between the D2D transmission and starting of the timer at the further wireless communication device.

11 . A wireless communication device, the wireless communication device comprising:

at least one processor, and

a memory containing program code executable by the at least one processor,

whereby execution of the program code by the at least one processor causes the wireless communication device to:

determine that a further wireless communication device is configured to switch between an inactive reception state and an active reception state;

perform a device-to-device (D 2 D) transmission to the further wireless communication device;

determine when the further wireless communication device will be in the active reception state, based on knowledge at the wireless communication device of a timer triggered at the further wireless communication device by the D2D transmission, wherein the further wireless communication device operates or remains in the active reception state according to the timer;

based on the determination of when the further wireless communication device will be in the active reception state, determine a candidate set of radio resources; and

from the candidate set of radio resources, select at least one radio resource for a further D2D transmission from the wireless communication device to the further wireless communication device.

12 . The wireless communication device according to claim 11 ,

wherein the D2D transmission comprises the transmission of sidelink control information (SCI).

13 . The wireless communication device according to claim 11 ,

wherein the SCI comprise a wakeup signal.

14 . The wireless communication device according to claim 13 ,

wherein the D2D transmission is a scheduling assignment, and wherein the further D2D transmission is a D2D transmission scheduled by the scheduling assignment.

15 . The wireless communication device according to claim 13 ,

wherein the further D2D transmission is a retransmission of the D2D transmission, and the timer is a retransmission timer used by the further wireless communication device that determines when the further wireless communication device will be in the active reception state for reception of the retransmission.

16 . The wireless communication device according to claim 15 ,

wherein the candidate set of radio resources is based on one or more time intervals corresponding to when the further wireless communication device will be in the active reception state, according to the retransmission timer.

17 . The wireless communication device of claim 11 , wherein the wireless communication device is a connected vehicle.

18 . A non-transitory computer readable medium storing computer program instructions that, when executed by at least one processor of a wireless communication device, cause the wireless communication device to:

determine that a further wireless communication device is configured to switch between an inactive reception state and an active reception state;

perform a device-to-device (D2D) transmission from the wireless communication device to the further wireless communication device;

determine when the further wireless communication device will be in the active reception state, based on knowledge at the wireless communication device of a timer triggered at the further wireless communication device by the D2D transmission, wherein the further wireless communication device operates or remains in the active reception state according to the timer;

based on the determination of when the further wireless communication device will be in the active reception state, determine a candidate set of radio resources; and

from the candidate set of radio resources, select at least one radio resource for a further D2D transmission from the wireless communication device to the further wireless communication device.

Assignments (3)

Priority Claims (1)

Continuity (1)

References Cited (16)