Patent ID: 8498298

Claim:
A method for receiving digital broadcast signal, the method comprising; receiving a broadcast signal including data groups, wherein the data groups include mobile service data and signaling data including transmission parameter, wherein the transmission parameter includes a protocol version field identifying a first transmission mode or a second transmission mode; wherein the first transmission mode is a mode in which the mobile service data are transmitted while reserving greater than 118 packets out of 156 packets in a slot and the second transmission mode is a mode in which the mobile service data are transmitted while reserving less than or equal to 118 packets out of 156 packets in the slot; demodulating the broadcast signal; decoding the signaling data including the transmission parameter; decoding the mobile service data according to the transmission parameter included in the signaling data, wherein the transmission parameter further includes a first extension mode field indicating a number of mobile service data packets exceeding 118 in a data group of a current data frame and a second extension mode field indicating a number of mobile service data packets exceeding 118 in a data group of a next data frame, wherein at least the current data frame or the next data frame includes 5 consecutive sub-frames, and wherein a sub-frame of the 5 consecutive sub-frames includes 16 consecutive slots, a slot of the 16 consecutive slots is a time period during which a data group of the data groups is transmitted.