Apparatus and method for transmitting or receiving broadcast signal

A receiver for processing data, the receiver comprising:

• an antenna configured to receive a broadcast signal;
• and
• a processor configured to parse LLS (Low Level signaling) included in the broadcast signal, wherein the LLS includes LLS table ID for identifying a type of a table delivered in a body and LLS table version, wherein a value of the LLS table version is incremented by 1 whenever any data in the table changes,
• wherein the processor is further configured to parse SLT (Service List Table) when the LLS table ID included in the LLS has a specific value, wherein the SLT includes service ID for identifying a service within a scope of a broadcast area and base URL to acquire service layer signaling files for all services in the SLT via broadband,
• wherein the processor is further configured to make HTTP (Hypertext Transfer Protocol) requests for signaling objects based on the base URL included in the SLT, wherein the processor is further configured to receive a response for the HTTP requests, wherein the response includes an MBMS (Multimedia Broadcast/Multicast Service) metadata envelope including an item element for each of the signaling objects included in the response, wherein an attribute of valid start time and an attribute of valid end time of the item element are used to indicate an interval of validity of each of the signaling objects,
• wherein the item element of the MBMS metadata envelope further includes an attribute of next URL, and the next URL is a first URL of a next scheduled update of a signaling object described in the item element, and
• wherein the processor is further configured to acquire the next scheduled update of the signaling object by making an HTTP GET request with the first URL by the attribute of next URL in the item element when the valid end time arrives for the signaling object that was acquired via broadband.