Performance Study Of Carrier Aggregation In LTE-Advanced System

With the development of mobile communication and the increasing of user number and date rate,3G system can't satisfy the requirement of users. So 3GPP devotes the study of LTE (Long Term Evolution) as the evolution of 3G system. And then 3GPP came up with LTE-Advanced, which can support backward-compatibility. With the discussion of LTE-Advanced in 3 GPP meeting, the options of the requirement and technology evolution become more and more mature. In the process of the evolution from LTE to LTE-Advanced, the requirement of wider bandwidth is one of the most important factors that affect the evolution, so 3GPP proposed carrier aggregation technology.On the basis of studying a large amount of relevant theories, this thesis firstly introduces the evolution of LTE and LTE-Advanced, the requirements and the technical features, and then it focuses on the theory and study of carrier aggregation, including the methods of carrier aggregation, the mapping transport block and the design of control channel and scheduling structure.In order to evaluate the performance of carrier aggregation, the whole simulation platform is implemented with C++ programming language, which framework is implemented based snapshot method. In each snapshot, the system performance statistician is achieved by time driving method. And then the platform achieved the downlink simulation of carrier aggregation and independent carrier respectively and achieved the two scheduling structures supported carrier aggregation, three traffic models (Full Buffer, Burst, and Finite Buffer) and multiple antenna technology. The simulation process and implement of function modules are detailed described in the thesis. The simulation in different scenarios mainly focuses on the performance enhancement of carrier aggregation and finally presents simulation results.