Performance Study Of Carrier Aggregation In Homogeneous And Heterogeneous Networks

With the development of mobile telecommunication system, the contradiction on wideband requirement and conditions of limited discontinuous spectrum assignment becomes more serious. Especially with the developments of wideband wireless access technology like WiMAX, in order to be more competitive,3GPP started its evolution from LTE to LTE-Advanced. In LTE-Advanced, it is intended to support bandwidth of 100MHz to achieve the downlink peak rate 1Gbps and uplink peak rate 500Mbps, and it is also required to guarantee the cell-edge date rate.Bandwidth extension in LTE-Advanced is supported via carrier aggregation. Carrier aggregation is a novel solution to aggregate the dispersed and narrow-band spectrum fragments into wideband spectrum, it can utilize the diverse spectrum heterogeneity to realize the optimization of resource allocation and usage.Performance of carrier aggregation in homogeneous and Heterogeneous networks have been discussed and analyzed respectively in this article. More specifically, in the analysis of homogeneous network, the performance of carrier aggregation is evaluated under independent carrier scheduling structure and joint carrier scheduling structure both theoretically and by simulation from various aspects, including different bandwidth configuration and antenna configuration. It turns out, carrier aggregation can raise the system throughput and fairness of users, and reduce transmission delay. In the study of heterogeneous network, this paper presents an interference coordination scheme based on carrier aggregation between Macro cell and pico cell, it turns out, this scheme can expand LTE-Advanced system capacity effectively.