Apparatus and method for transmitting reverse packet data in mobile communication system

1. A method for controlling a reply signal transmission by a reply signal transmitter including an error detector, a repeater, a repeater controller, and a transmitter, in a mobile communication system, the method comprising:

determining, by the error detector, whether an error is detected in received data through a radio channel;

generating a reply signal according to the error detection;

determining, by the repeater controller, a repetition control signal with a value that differs according to a data transmission rate;

repeatedly replicating, by the repeater, the reply signal according to the repetition control signal; and

transmitting, by the transmitter, the replicated reply signal through the radio channel.

2. The method of claim 1 , wherein the reply signal includes an ACKnowledgement/Non-ACKnowledgement (ACK/NACK) signal.

3. A method for controlling a reply signal transmission by a reply signal transmitter including an error detector, a transmission power controller, and a transmitter, in a mobile communication system, the method comprising:

determining, by the error detector, whether an error is detected in received data through a radio channel;

generating a reply signal according to the error detection;

controlling, by the transmission power controller, power for the reply signal with a power value that differs according to a data transmission rate; and

transmitting, by the transmitter, the reply signal, based on the controlled power.

4. The method of claim 3 , wherein the reply signal includes an ACKnowledgement/Non-ACKnowledgement (ACK/NACK) signal.

5. A method for controlling a reply signal reception by a reply signal receiver including a summer, a summer controller, and a determiner, in a mobile communication system, the method comprising;

receiving, by the reply signal receiver, a reply signal through a radio channel;

determining, by the summer controller, a symbol summation control signal for controlling summation based on a number of repetitions according to a transmission rate;

summing, by the summer, the received reply signal according to the symbol summation control signal; and

determining, by the determiner, whether a previously transmitted data has been accurately received, based on a result of the summing.

6. The method of claim 5 , further comprising:

retransmitting the previously transmitted data, if the previously transmitted data has not been accurately received.

7. The method of claim 5 , further comprising:

transmitting new data, if the previously transmitted data has been accurately received.

8. The method of claim 5 , wherein the reply signal includes an ACKnowledgement/Non-ACKnowledgement (ACK/NACK) signal.