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Abstract:
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Wireless data traffic has been increasing significantly in recent years. In order to meet
demands for mobile broadband services, we must improve quality of services, data rates and
capacity of network systems. There are some solutions is considered, the reduction of cell
size is the most effective solution. However, this solution may cause the increase of cost
since more infrastructures is needed. Femtocell may be good solution for our network
systems. Femtocell is used to improve coverage and provide high data rate in indoor
environment. Unfortunately, it also has some drawbacks such as femtocell may cause
interference to other femtocells or to the macrocellular wireless network. Therefore,
investigating and analyzing interference in network systems including femtocells and
macrocells is very important.
In this thesis, I supposed three network models containing Femtocell Access Point
(FAP), Macrocell Base Station (Macro NodeB), User Equipment (UE) and based on the
simulation, I analyze and investigate the interference between macrocell and femtocells under
three scenarios. Specifically, in the first scenario, I analyze and evaluate the effect from the
downlink of macrocell caused to the femtocell receiver, from that we can find the maximum
range of the femtocell at which the UE can detect and decode the femto beac on and
connecting to it. In the second scenario, I focus on evaluation the influence from the uplink of
Macrocell User (MUE) caused to the received SINR (Signal plus Interference to Noise Ratio)
of Femtocell User (FUE) from FAP and calculating the minimum transmit ted power of FUE
need to maintain the uplink connection between the FUE and femtocell. The final scenario, I
investigate the effects of the number s of Femtocell caused to MUE based on the received
SINR of MUE. Experimental results show the big effects of signal interference between
macrocell and femtocells, thus we need more effective solutions to manage interference
between them. |