DRX operation for D2D communication

1 . A method of controlling device-to-device (D2D) communication, the method performed by a wireless communication device and comprising:

determining a Discontinuous Reception (DRX) configuration for D2D communication;

aligning the DRX configuration for D2D communication with a further wireless communication device, wherein aligning the DRX configuration comprises:

receiving configuration information from the further wireless communication device, wherein the received configuration information indicates one or more candidate DRX configurations for D2D communication;

based on the received configuration information, determining configuration information for at least a part of the DRX configuration for D2D communication;

indicating the determined configuration information to the further wireless communication device, and

in response to said indicating the determined configuration information, receiving acknowledgement information indicating whether the determined configuration information is accepted, wherein the acknowledgement information also indicates an updated DRX configuration for D2D communication; and

based on the aligned DRX configuration for D2D communication, participating in D2D communication with the further wireless communication device.

2 . The method according to claim 1 , wherein the determined configuration information is indicated by a D2D transmission to the further wireless communication device.

3 . The method according to claim 2 , wherein the determined configuration information is indicated by one or more of the following in the D2D transmission: radio resource control (RRC) information, medium access control (MAC) control information, and physical layer control information.

4 . The method according to claim 1 , wherein at least part of the configuration information is determined further based on one or more of the following:

a DRX configuration for downlink or uplink communication with a wireless communication network; and

characteristics of D2D communication between the wireless communication device and the further wireless communication device.

5 . The method according to claim 1 , wherein the configuration information received from the further wireless communication device is received in a D2D transmission as one or more of the following: radio resource control (RRC) information; medium access control (MAC) control information, and physical layer control information.

6 . The method according to claim 1 , wherein the configuration information indicates at least part of the DRX configuration for D2D communication based on one of the following:

a deviation of one or more parameters of the DRX configuration from a DRX configuration for downlink or uplink communication with the wireless communication network; and

identifying one among multiple pre-configured DRX configurations.

7 . The method according to claim 1 , wherein at least part of the DRX configuration for D2D communication is determined further based on one or more of the following:

a DRX configuration for downlink or uplink communication with the wireless communication network; and

characteristics of D2D communication between the wireless communication device and the further wireless communication device.

8 . The method according to claim 1 , wherein the wireless communication device is a connected vehicle.

9 . A non-transitory, computer-readable medium storing program code executable by one or more processors of a wireless communication device, wherein execution of the program code configures the wireless communication device to perform operations corresponding to the method according to claim 1 .

10 . A wireless communication device comprising:

a radio interface configured for at least device-to-device (D2D) communication;

one or more processors operably coupled to the radio interface; and

a memory storing program code executable by the one or more processors, wherein execution of the program code configures the wireless communication device to:

determine a Discontinuous Reception (DRX) configuration for D2D communication;

align the DRX configuration for D2D communication with a further wireless communication device, including the following operations:

receive configuration information from the further wireless communication device, wherein the received configuration information indicates one or more candidate DRX configurations for D2D communication;

based on the received configuration information, determine configuration information for at least a part of the DRX configuration for D2D communication,

indicate the determined configuration information to the further wireless communication device, and

in response to indicating the determined configuration information, receive acknowledgement information indicating whether the determined configuration information is accepted, wherein the acknowledgement information also indicates an updated DRX configuration for D2D communication; and

based on the aligned DRX configuration for D2D communication, participate in D2D communication with the further wireless communication device.

11 . The wireless communication device according to claim 10 , wherein the determined configuration information is indicated by a D2D transmission to the further wireless communication device.

12 . The wireless communication device according to claim 11 , wherein the determined configuration information is indicated by one or more of the following in the D2D transmission: radio resource control (RRC) information, medium access control (MAC) control information, and physical layer control information.

13 . The wireless communication device according to claim 10 , wherein execution of the program code configures the wireless communication device to determine at least part of the configuration information further based on one or more of the following:

a DRX configuration for downlink or uplink communication with a wireless communication network; and

characteristics of D2D communication between the wireless communication device and the further wireless communication device.

14 . The wireless communication device according to claim 10 , wherein the configuration information received from the further wireless communication device is received in a D2D transmission as one or more of the following: radio resource control (RRC) information; medium access control (MAC) control information, and physical layer control information.

15 . The wireless communication device according to claim 10 , wherein execution of the program code configures the wireless communication device to determine at least part of the DRX configuration for D2D communication further based on one or more of the following:

a DRX configuration for downlink or uplink communication with the wireless communication network; and

characteristics of D2D communication between the wireless communication device and the further wireless communication device.

16 . The wireless communication device according to claim 10 , wherein the wireless communication device is a connected vehicle.