Dear Yang,
you are playing here around with parameters that are not implemented for general purpose scenarios, but are only utilized in a meaningful way when the setup is correctly done; that’s why these parameters are stored in “LTE_load_advanced_parameters”. We have been using these parameters in our research work and they have got nothing to do with LTE-compliant data transmission (i.e., these parameters are actually not standard defined). Since that research work lies already 5-6 years in the past, I cannot tell you any more how to setup everything correctly to get proper behaviour with implicit/explicit CQI feedback.
Best,
Stefan.