Method and apparatus for radio link monitoring and radio link failure in sidelink communication

A method performed by a terminal in a communication system, the method comprising:

• transmitting, to another terminal, sidelink data on a sidelink;
• determining whether a radio link failure (RLF) associated with the sidelink is detected based on sidelink hybrid automatic repeat request (HARQ) information for the sidelink data;
• and
• in case that the RLF is detected, transmitting, to a base station, information indicating that the RLF associated with the sidelink occurs,
• wherein the terminal is connected with the base station,
• wherein it is determined that the RLF is detected in response to the sidelink HARQ information being not received during a threshold, and
• wherein the threshold starts a timing of a last reception of the sidelink HARQ information.