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In this paper, we present a preliminary work within the CEG to evaluate the LTE-advanced proposal as a candidate for further improvements of LTE earlier releases. We consider an open-source LTE simulator that implements most of the LTE features. We focus on channel state variations and related link adaptation. We study the performance of channel quality report to the transmitter to track the downlink time-frequency channel variations among users. This process aims at performing link adaptation. To insure this procedure, we implement a CQI feedback scheme to an LTE open-source simulator. SINRs per subcarriers are computed supposing a perfect channel knowledge then mapped into a single SINR value for the whole bandwidth. This SINR is represented by a CQI value that allows for dynamic MCS allocation. CQI mapping is evaluated through different SINR mapping schemes.