A method for performing radio link control (RLC) with round trip time (RTT) awareness is provided, where the method is applied to an electronic device. The method includes: dynamically estimating an index according to one or more factors; and based upon the index, dynamically adjusting a status prohibit timer value of a status prohibit timer for performing RLC. For example, the index can be an RTT of transmission/retransmission, and the step of dynamically estimating the index may further include: dynamically estimating the RTT of transmission/retransmission by detecting a time period between a first time point and a second time point, wherein the first time point represents time of sending a negative acknowledgement (NACK) status report. In another example, the index can be an RTT awareness index, where the method may include estimating the RTT awareness index according to at least one predetermined estimation function. An associated apparatus is also provided.