Method of error recovery in transmitting and receiving voice service in packet based mobile communication systems

A base station for transmitting data to a terminal, the base station comprising:

• a transmitter configured to transmit a first part of the data and an activation message indicating a start of a persistent scheduling transmission in a same persistent allocation interval, the activation message transmitted through a Physical Downlink Control Channel (PDCCH);
• and
• a receiver configured to receive an acknowledgement message for the activation message from the terminal,
• wherein the transmitter is further configured to transmit a second part of the data according to the persistent scheduling transmission,
• wherein the transmitter is further configured to transmit a deactivation message indicating an end of the persistent scheduling transmission,
• wherein the receiver is further configured to receive an acknowledgement message for the deactivation message from the terminal, and wherein the activation message is retransmitted to the terminal if a negative acknowledgement message for the activation message is received or a positive acknowledgement message for the activation message is not received from the terminal.