The Research On The Interference Between Femtocells In TD-SCDMA System

With the rapid development of mobile communication and progress of wireless high-speed access technology, the proportion of mobile data services in all kinds of services has become higher and higher. At presently, the survey indicates that most of the data services are used in indoor environments. However, the macro NodeB of 3G works on high frequency and its penetration loss is high for indoor users. In the areas crowded with lots of buildings, the signal quality is poor in indoor environments. Considering the deployment cost, we can not solve the problem only by deploying macro NodeB. So femtocells are used to provide high-speed data services in indoor environments. Furthermore, the fixed broadband can be used as return loop for the femtocells without any change of existing network structure. Femtocell has become one of foundation for the fixed-mobile convergence.The licensed frequency spectrums are used by femtocells system. And the femtocells are installed by users without network planning, which will lead to serious interference problem. At present, the research is focused on the interference between macro NodeB and Femtocell. The research was relatively less for the interference between Femtocells. In this paper, we use static simulation method to construct system simulation platform. By simulating different scenarios of uplink and downlink interference, we can analyze and evaluate the results, such as user satisfaction in the system. So we can research the interference between Femtocells in TD-SCDMA system comprehensively. And finally we summarize the analysis and propose prospect.