Terminal and base station in wireless communication system supporting discontinuous reception operation, and method therefor

A base station in a wireless communication system configured to support connected discontinuous reception (C-DRX) operation, the base station comprising:

• a transceiver;
• and
• at least one processor, comprising processing circuitry,
• wherein at least one processor, individually and/or collectively, is configured to:
• receive at least one piece of uplink control information (UCI) periodically from a terminal through the transceiver;
• predict reception power of a scheduling request (SR) message, based on reception power of the at least one piece of UCI;
• measure the reception power of the SR message through the transceiver from the terminal;
• identify that the SR message is received based on the measured reception power;
• set the maximum number of retransmissions of an UL grant capable of being transmitting by the base station based on the measured SR message reception power and the predicted SR message reception power;
• control the transceiver to transmit a UL grant corresponding to the SR message to the terminal;
• control the transceiver to retransmit the UL grant to the terminal, based on a failure to receive UL data responding to the UL grant from the terminal;
• and
• determine that the base station does not receive the SR message based on identifying that the number of retransmissions of the UL grant reaching the maximum number of retransmissions of the UL grant.