An electronic device and a method of operating the electronic device in a wireless communication system are provided. The method includes determining whether to perform a partial decoding or a normal decoding based on a channel quality; if partial decoding is performed, decoding partial data received by a transceiver from a second electronic device during a part one TTI; when the decoding of the partial data succeeds, performing at least one complementary decoding until a decoding success count reaches a decoding threshold; and when the decoding success count reaches the decoding threshold, outputting a decoding result for the at least one complementary decoding; and if normal decoding is performed, decoding all data of the one TTI and outputting a result. One of the at least one complementary decoding comprises decoding previous data, and additional data received by the transceiver during an additional part of the one TTI, after the previous data.