Apparatus and method for transmitting/receiving data in communication system

A method for generating and transmitting a parity bit sequence by a transmission device in a communication system, comprising:

• generating a basic masking pattern according to a basic puncturing pattern;
• masking a parity bit sequence with the basic masking pattern;
• outputting, as a basic parity bit sequence, non-punctured parity bits that are remaining after the masking of the parity bit sequence with the basic masking pattern;
• generating a first secondary masking pattern according to a secondary puncturing pattern;
• generating a first additional masking pattern based on the basic masking pattern and the first secondary masking pattern,
• masking the parity bit sequence with the first additional masking pattern;
• outputting, as a first additional parity bit sequence, non-punctured parity bits that are remaining after the masking of the parity bit sequence with the first additional masking pattern;
• and
• transmitting, from the transmission device to a receiving device of the communication system, the output basic parity bit sequence and the output first additional parity bit sequence,
• wherein the first additional parity bit sequence is transmitted in a frame preceding a particular frame in which the basic parity bit sequence is transmitted.