Method of transmitting and receiving control information in a wireless communication system

A method of transmitting a signal associated with a broadcast service, the method comprising:

• modulating the signal by an OFDM (Orthogonal Frequency Division Multiplexing) scheme, the signal carrying a frame that has a plurality of OFDM symbols in a time domain and a plurality of subcarriers in a frequency domain;
• and
• transmitting the modulated signal through a physical channel,
• wherein the frame is composed of an information region and a data region,
• wherein a part of continuous OFDM symbols in the frame is mapped to the information region for transmission of Layer 1 (L1) information and a remaining part of continuous OFDM symbols in the frame is mapped to the data region for transmission of data for the broadcast service,
• wherein the information region is located before the data region in the frame,
• wherein the L1 information includes first information, the first information being signaled for the broadcast service, wherein the first information indicates a change of second information related to the broadcast service, and
• wherein the L1 information further includes identification information for uniquely identifying a data channel for carrying the broadcast service and allocation information on position of the broadcast service in the frame.