A method for transmitting a broadcast signal is discussed. The method includes generating transport packets of a transport stream having service data for a broadcast service, compressing headers of the transport packets and extracting context information from the transport packets according to a processing mode, encapsulating the transport packets into link layer packets for data, generating signaling information including the context information and information indicating the processing mode, encapsulating the signaling information into link layer packets for signaling, and transmitting the broadcast signal including the link layer packets for data and the link layer packets for signaling.