An embodiment method for operating a base station includes instructing, by the base station, a mobile device to transmit, over grouped communications resources, a first instance of a data structure for D2D signaling. The data structure includes a first data field that indicates at least one of a D2D frame number, a D2D multiplexing configuration, a resource allocation for D2D signaling, an identifier of a D2D synchronization source, a type of a D2D synchronization source, or whether the mobile device is in coverage of a network. The data structure also includes a second data field indicating at least one of whether a D2D signaling operation is prohibited, or a type of prohibited D2D signaling operation.