Apparatus and method of transmitting and receiving reception acknowledgment signal in mobile communication system

An apparatus for receiving a reception acknowledgment signal comprising:

• a reception acknowledgment signal receiving unit receiving a reception acknowledgment signal indicating success or failure of receiving transmitted packet data correctly;
• a transmission power estimating unit respectively determining transmission powers of a reception success signal indicating a success of receiving the packet data correctly and a reception failure signal indicating a failure of receiving the packet data correctly based on an average transmission power and a required packet error rate, which is set to be the same as a packet error rate with the apparatus for transmitting a reception acknowledgment signal, in order to maximize a difference between a first signal and a second signal, the first signal being modulated for the reception success of the packet data and the second signal being modulated for the reception failure of the packet data;
• a reception success probability calculating unit respectively calculating the probability that the reception acknowledgment signal is the reception success signal and the probability that the reception acknowledgment signal is the reception failure signal, by using an estimated packet error rate predicted with respect to success or failure of receiving the packet data correctly, based on the transmission powers of the reception success signal and the reception failure signal respectively estimated, and the required packet error rate;
• and
• a reception acknowledgment signal determining unit determining whether the reception acknowledgment signal is the reception success signal or the reception failure signal based on the respectively calculated probabilities.

A method of receiving a reception acknowledgment signal comprising:

• (a) receiving a reception acknowledgment signal indicating success or failure of receiving transmitted packet data correctly;
• (b) respectively determining transmission powers of a reception success signal indicating a success of receiving the packet data correctly and a reception failure signal indicating a failure of receiving the packet data correctly based on an average transmission power and a required packet error rate, which is set to be the same as a packet error rate with the apparatus for transmitting a reception acknowledgment signal, in order to maximize a difference between a first signal and a second signal, the first signal being modulated for the reception success of the packet data and the second signal being modulated for the reception failure of the packet data;
• (c) respectively calculating the probability that the reception acknowledgment signal is the reception success signal and the probability that the reception acknowledgment signal is the reception failure signal, by using an estimated packet error rate predicted with respect to success or failure of receiving the packet data correctly, based on the transmission powers of the reception success signal and the reception failure signal respectively estimated, and the required packet error rate;
• and
• (d) determining whether the reception acknowledgment signal is the reception success signal or the reception failure signal based on the respectively calculated probabilities.