The Research Of Advanced Techonology In LTE-A System

Along with the high user demand of communication service and WiMAX technology develop rapidly. In order to meet this challenges,3GPP began the research of LTE. LTE-A is the further evolution of LTE. In the course of evolution, LTE-A introduced CoMP(Coordinated Multi-point Transmission and Reception), Het-Net (Heterogeneous Network), CA (Carrier Aggregation) and Relay as feature, which can meet the demand of system capacity and user throughput. Het-Net solved the problem of hot point overlap after include low-power node. CoMP improve the system performance via the coordinate of several node, especially the service quality in the cell edge. Nowadays, this technologies has became the hotspot of mobile communication research.This paper emphasizes Het-Net and CoMP technology of LTE-A. The main contributions are as follows:Construct the LTE-A system level platform depend on protocol and theoretical research. Introducing the algorithms such as measurement rules, event trigger, handover and scheduling. Round Robin and Proportional Fair algorithms are emphasized in the scheduling module. The main algorithms and important modules construct the core of the platform, it ensure correctness of the data.In heterogeneous network system, the station distribution changed after the introduction of low-power node. This changes affect the count of channel interference, handover and resource allocation. The interference between cells and complexity are improved after the introduction of low-power node. The interference caused high handover failure rate, it can be solved by interference coordination solution. To solve the problem of uneven resource allocation, this thesis put forward a load balance method. This method improve the system performance depend on the load of cells and service quality.In CoMP system, there are several schemes of handover trigger event because every user is serviced by coordinated multi-point. In order to find the best scheme, all information can be use in the coordinated group during the handover. This thesis simulated three scheme under the different handover trigger events. According to analyse simulation results of handover, Ping:Pang handover and throughput to identify the best scheme.