Browsing by Author "Hurissa, Dejene"

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    Deployment of Long Term Evolution (LTE) Femtocells in Dead Zone Areas
    (Addis Ababa University, 2014-12) Hurissa, Dejene; Negash, Yalemzewd(PhD)
    The aim of this thesis is to investigate the use of femtocells deployment for indoor users under long term evolution (LTE).LTE is currently under deployment in Addis Ababa to support the high traffic demand of devices. Addis Ababa as a capital city of Ethiopia has got different big buildings, companies, hotels, hospitals, condo, and residential houses etc. Most of the calls and data services like exploring internet will takes place indoors. Although LTE is the latest technology, due to different signal attenuation factors like the number of walls, the number of floors, furnitureā€Ÿs and others, the need of subscribers are not fulfilled yet. For this reasons femtocells are taken as solution, with the aim of enhancing the capacity for indoor users. They are new technological advance, which are used to significantly boost cellular network performance especially in indoors. Firstly, this thesis is intended to give good understanding of LTE technology and femtocells. In the second stage several femtocells deployment constraints are studied along with the proposed flow chart. These constraints are spectrum allocation, handover, interference, mobility and give some ideas for how to overcome them. Jamo condo was taken as a sample for performance analysis using Multi Wall Multi Floor (MWMF) indoor propagation model. Finally this thesis work could be investigated by comparing the performance of LTE with and without femtocells deployment using MATLAB. The performances of femtocells are discussed based on specific key performance indicators (KPI). Accordingly path losses, received power, signal to interference plus noise ratio, data rate and power control are performance measurements used in this thesis. The results of the experiment show that femtocells are well suited for enhancing network capacity for indoor users. However, unable to be done based on real deployment due to absence of femtocells in all buildings of Addis Ababa. This thesis work recommends further study of the femtocells technology for increasing the data rate in certain dead zone areas other than indoors. Key words: LTE; femtocells; deployment considerations