Dear Hailey Lee,
for further information about the feedback calculation I recommend the following literature:
https://publik.tuwien.ac.at/files/PubDat_186497.pdf
https://publik.tuwien.ac.at/files/PubDat_187402.pdf
https://publik.tuwien.ac.at/files/PubDat_184424.pdf
Basically, the CQI feedback is calculated in every subframe and reported back, with a certain adjustable delay. Meaning that the reported CQI values are stored in a FIFO buffer and exploited at a later TTI.
Our simulator currently supports only FDD mode with CQI reporting every TTI. If you want to enable periodic CQI reporting with a periodicity larger than one TTI, or even a-periodic reporting, you would have to modify this buffering structure to fit your requirements.
best
Stefan