This research investigates the effects of Channel Quality Indicator (CQI) feedback delays on the Joint User Scheduling Scheme (JUS) and the Separated Random User Scheduling Scheme (SRUS) within an LTE-Advanced (LTE-A) system utilizing carrier aggregation. The study will compare scenarios involving delayed channel information against those with perfect channel knowledge across various deployment contexts. The analysis considers CQI delays ranging from 3 to 6 milliseconds, with the upper limit set at 6 milliseconds, as delays exceeding this threshold are deemed impractical for LTE-A systems. This range effectively reflects the delays associated with LTE-A feedback protocols and the realistic processing times of evolved Node B (eNB). The focus is on a downlink Orthogonal Frequency Division Multiplexing (OFDM)-based carrier aggregation system, which comprises multiple eNode-Bs and numerous User Equipments (UEs) distributed randomly within the cell. Each component carrier (CC) is made up of R Resource Blocks (RBs), with each RB containing K subcarriers in the frequency domain and one frame in the time domain. The traffic model employed in this study is a continuous data stream (Full Buffer), which serves, as a useful baseline despite being an idealized scenario, as scheduling and user throughput remain unaffected by the volume of data in the transmission buffer................. Keywords: .......CQI delay, Scheduling, LTE-A