In accordance with another aspect of the disclosure, a first terminal is provided. The first terminal includes a transceiver configured to transmit and receive a signal, and a controller configured to receive, from a base station, a control message including a configuration for a configured sidelink grant, transmit, to a second terminal, a sidelink signal based on the configured sidelink grant for a first sidelink logical channel which is allowed to use the configured sidelink grant, start a timer associated with a radio link failure, in case that a consecutive out of synchronization indications for a cell are received from a lower layer, identify whether there is a second sidelink logical channel which is not available for the configured sidelink grant, transmit, to the second terminal while the timer is running, the sidelink signal based on the configured sidelink grant, in case that there is no sidelink logical channel not available for the configured sidelink grant, and transmit, to the second terminal while the timer is running, the sidelink signal based on a resource from an exceptional transmission pool, in case that there is the second sidelink logical channel not available for the configured sidelink grant.