Performations Analysis And Optimization Of Femtocell Networks

With the development of technology, wireless communication has become one of the most important things in people's normal life in these decades, which in turn promotes the rapid expansion of mobile communication. In order to further satisfy the high speed data transmission indoors in the future communication system:3G/B3G/LTE, the key technologies---Femtocell has been investigated for better indoor voice and data reception. And femtocell has been considered the most potential technology since it is proposed at the beginning.Femtocells, also named Home NodeB,which are a low-power and low-cost and user-deployed wireless access points that operate in licensed spectrum to connect standard mobile devices to a mobile operator's network using residential DSL or cable broadband connections.And they have extensive auto-configuration and self-optimization capability to enable a simple plug-and-play development, and are designed to automatically integrate themselves in an existing macrocellular network. Femtocell is a newly conception which can compensate the original indoor coverage problem and improve system capacity of 3G networks and also can compete with the Wi-Fi access point. It is considered as a solution for the fixed and mobile network convergence (FMC) and improves competence.Although femtocell offers a number of important benefits to both consumers and operators, there are still several problems need to,be solved when it is deployed in a large amount and scale. In this paper, first, we introduce the basic concepts of femtocell and its deployment in the system facing technical challenges according to the related proposals by 3GPP and other reference. Second, the radio resource management algorithms of WCDMA and the coexistence system model of femtocell and WCDMA network are elaborated in detail.And then, we mainly focus on the output power and the pilot power of femtocell and the downlink theoretical analysis when femtocells are deployed in UMTS network. Last, the handover of indoor and outdoor users between UMTS based macrocell and femtocell networks adopting a simulation model on system level by Matlab.New adaptive pilot power control algorithms based fixed parameters and dynamic parameters with the aims to reduce the unncessary handover are presented in this paper. We simulate, the proposed handover optimization scheme to improve the performance of macrocell/femtocell network.