In Long Term Evolution-Advanced (LTE-A), the signal quality in a wireless channel is estimated based on the channel quality\nmeasurements.Themeasurement results are used to select suitablemodulation and coding scheme for each transmission, feedback,\nand processing delay, which can cause amismatch between channel quality information (CQI) and current channel state at the base\nstation. However, prospect delays in the reception of such CQI may lead to a system performance degradation. This study analyzes\nthe impact of CQI feedback delay on joint user scheduling (JUS) scheme and separated random user scheduling (SRUS) scheme\nin LTE-A system over carrier aggregation. The analysis will be compared with the system having delayed channel and perfect\nknowledge at different deployment scenario.We will study the throughput performance of both scheduling schemes with different\ndeployment scenario, and then recommend the suitable deployment scenario to keep the desired QoS for a specific number of\nusers. Results show that, in main beamdirected at sector boundaries and diverse coverage, JUS scheme performs better than SRUS,\nwhich can justify the intensive use of user equipment power and extra control signaling overhead.
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