Identification of control information for sidelink management

1. A method for a first wireless device in a wireless communication system, the method comprising:

establishing sidelink with a second wireless device;

receiving, from the second wireless device, information on a period of a Sidelink Control Information (SCI) for management of the established sidelink, the SCI including at least one identifier (ID) associated with the established sidelink;

starting a timer corresponding to the period of the SCI;

monitoring the SCI while the timer is running;

determining one of in-sync indication or out-of-sync indication for the monitored SCI, upon an expiry of the timer;

detecting a failure of the established sidelink, based on a predetermined number of out-of-sync indications occurring consecutively; and

releasing the established sidelink upon detecting the link failure,

wherein the in-sync indication is determined for the monitored SCI, based on receiving the SCI including the at least one ID associated with the established sidelink, while the timer is running, and

wherein the out-sync indication is determined for the monitored SCI, based on not receiving the SCI including the at least one ID associated with the established sidelink, while the timer is running.

2. The method of claim 1 , wherein a hybrid automatic repeat request (HARQ) feedback in response to the SCI is not transmitted to the second wireless device.

3. The method of claim 1 , wherein the link is established for multiple services associated with different IDs.

4. The method of claim 1 , wherein the at least one ID includes a source layer-2 ID, a destination layer-2 ID and/or a link ID.

5. The method of claim 1 , wherein the second wireless device is at least one of a mobile device, a network, and/or autonomous vehicles other than the first wireless device.

6. A wireless device in a wireless communication system, the wireless device comprising:

at least one transceiver;

at least processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:

establishing a sidelink with a second wireless device;

receiving, from the second wireless device, information on a period of a Sidelink Control Information (SCI) for management of the established sidelink, the SCI including at least one identifier (ID) associated with the established sidelink;

starting a timer corresponding to the period of the SCI;

monitoring the SCI while the timer is running;

determining one of in-sync indication or out-of-sync indication for the monitored SCI, upon an expiry of the timer;

detecting a failure of the established sidelink, based on a predetermined number of out-of-sync indications occurring consecutively; and

releasing the established sidelink upon detecting the link failure,

wherein the in-sync indication is determined for the monitored SCI, based on receiving the SCI including the at least one ID associated with the established sidelink, while the timer is running, and

wherein the out-sync indication is determined for the monitored SCI, based on not receiving the SCI including the at least one ID associated with the established sidelink, while the timer is running.

7. The wireless device of claim 6 , wherein a hybrid automatic repeat request (HARQ) feedback in response to the SCI is not transmitted to the second wireless device.

8. The wireless device of claim 6 , wherein the link is established for multiple services associated with different IDs.

9. The wireless device of claim 6 , wherein the at least one ID includes a source layer-2 ID, a destination layer-2 ID and/or a link ID.