Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method of transmitting broadcast signals and method of receiving broadcast signals

An apparatus for providing a broadcast service as a PD (Primary Device), the apparatus comprising:

• a receiving module that receives broadcast signals;
• a first processing module that processes the broadcast signals to output a SLT (Service List Table) and ROUTE (Real-Time Object Delivery over Unidirectional Transport) packets;
• a second processing module that parses the SLT including bootstrap information, the bootstrap information indicating a transport session carrying SLS (Service Layer Signaling), wherein the SLS signals service data of the broadcast service, and the service data includes streaming components of the broadcast service and app components;
• and
• a third processing module that obtains the SLS by accessing the transport session carrying the SLS, and that obtains the streaming components and the app components by using the SLS,
• wherein the app components include data related to an app-based enhancement of the broadcast service, and wherein the app components are NRT (Non-Real Time) components.