Research On Power Control And Power Scale In Carrier Aggregation System

LTE-A was proposed by 3GPP in order to meet the requirements of 4G mobile communication standard. Carrier aggregation technology was introduced in LTE-A as a key technology. Carrier aggregation technology was designed to to meet the higher bandwidth requirements by aggregating multiple scattered narrowband spectrum, thereby achieving higher peak transmission rate and spectral efficiency. Because the introduction of carrier aggregation technology, some technical of the LTE need to make some improvements in order to accommodate the new communication scenario, such as power control techniques. In addition, it also brought some new problems, such as power scaling and the compatible with LTE system.Based on the research of the power control in LTE and several traditional power control algorithms, and combined the full power compensation thoughts of the traditional power control algorithm with the carrier aggregation power control algorithm based on Io T, an improved power control algorithm of the carrier aggregation system was proposed. The algorithm satisfies the requirements of carrier aggregation system, each component carriers were applied power control. The algorithm divided users of the cell into edge users and center users, the power control algorithm of full power compensation was used on the central users, the power control algorithm based on Io T still was used on the edge users. The result of simulation showed that the improved power control algorithm elevate system throughput effectively.Secondly, A power reduction scheme was proposed based on the study of the convex optimization theory and the power control algorithms, and an analysis was made on the necessity and importance of power reduction of the carrier aggregation system. The power reduction scheme was performed after the power control which was based on convex optimization. Each component carrier need power reduction which was based on the limit of maximum transmit power of single component carrier. The simulation result showed that sector throughput of the carrier aggregation system with optimization power control and power reduction performed better than the carrier aggregation system without power reduction.