Abstract: A method in wireless device (110) is disclosed. The method comprises determining (404) a synchronization source for the wireless device, and determining (408) a synchronization priority of the synchronization source. The method comprises determining (412) one or more rules for dropping transmissions of sidelink synchronization signals, the one or more rules corresponding to the synchronization priority of the synchronization source. The method comprises dropping (416) transmissions of sidelink synchronization signals according to the determined one or more rules for dropping transmissions of sidelink synchronization signals.