Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail

The issues of poor coverage for indoor users are mainly due to path loss, building penetration loss, multipath, shadowing and interference. These issues are further compounded with the tremendous increase in subscribers demand for real-time multimedia services, particularly in urban areas. The Femto...

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Main Author:	Ismail, Izwah
Format:	Thesis
Language:	English
Published:	2017
Subjects:	Telecommunication Data transmission systems
Online Access:	https://ir.uitm.edu.my/id/eprint/39339/1/39339.pdf
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spelling	my-uitm-ir.393392021-08-30T04:21:42Z Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail 2017-07 Ismail, Izwah Telecommunication Wireless communication systems. Mobile communication systems. Access control Data transmission systems The issues of poor coverage for indoor users are mainly due to path loss, building penetration loss, multipath, shadowing and interference. These issues are further compounded with the tremendous increase in subscribers demand for real-time multimedia services, particularly in urban areas. The Femtocell being a low power base station is considered as the promising technology to enhance the QoE for the indoor and the edge users. Based on the two tier network topology, the macro layer will provide wider coverage with low average data speeds while the Femtocell is predicted to extend the network coverage and eventually boost the network capacity for indoor subscribers. Traditionally, the spectrum allocation for the Femtocell is from the similar spectrum bands that are being used by the Microcell. Obviously, the capacity of the Femtocell is quite limited due to the spectrum constraint and the interference between Microcell and Femtocell network. These issues motivate the study to mitigate the interference and to increase the network capacity by focusing on the spectrum scarcity problem and the tremendous increase of indoor users. The first part of the thesis is focused on the downlink performance of Femtocell configuration deployed in LTE network. The coverage performance is presented as the percentage of satisfied users achieving a data rate above a minimum requirement, in the range of 90-95% coverage. The walk test performance is evaluated in real time network scenarios, including realistic macro network layouts in homogeneous spatial traffic distributions. Then, by considering the Fractional Frequency Reuse (FFR) scheme to mitigate the interferences, a simulation experiment was conducted. The objective of this study is to boost up the overall throughput and user's satisfaction. In the meantime, it has been shown that the spectrum is not efficiently used by licensed (primary) users according to the exclusive spectrum allocation regulation. Hence the Cognitive Femtocell (CogFem) network has been proposed based on the greedy algorithm to allow unlicensed users to exploit spectrum opportunities from primary systems to enhance the spectrum utilization and mitigate interference. Both functions of frequency channel allocation and transmission power adjustment are proposed. The final contribution presented in this thesis is the Strategic CogFem Spectrum Sensor Scheme (SCFSSS) with the focus on cooperative spectrum sensing to minimize the duration to sense the available bandwidth and avoid the false alarm as well as mitigate the interference and improve user's throughput in a licensed or unlicensed spectrum. The comparisons between local sensing and cooperative sensing are presented. In the proposed SCFSSS mechanism the Femtocell Access Point (FAP) cooperates with Femtocell Users (FUs) as the sensing nodes. The final decision will be decided by the FAP. The results presented have shown 60% improvements by providing enough bandwidth capacity to accommodate the sudden increase of mobile subscribers. 2017-07 Thesis https://ir.uitm.edu.my/id/eprint/39339/ https://ir.uitm.edu.my/id/eprint/39339/1/39339.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Electrical Engineering Baba, Mohd. Dani (Prof. Dr.)
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Baba, Mohd. Dani (Prof. Dr.)
topic	Telecommunication Telecommunication Data transmission systems
spellingShingle	Telecommunication Telecommunication Data transmission systems Ismail, Izwah Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail
description	The issues of poor coverage for indoor users are mainly due to path loss, building penetration loss, multipath, shadowing and interference. These issues are further compounded with the tremendous increase in subscribers demand for real-time multimedia services, particularly in urban areas. The Femtocell being a low power base station is considered as the promising technology to enhance the QoE for the indoor and the edge users. Based on the two tier network topology, the macro layer will provide wider coverage with low average data speeds while the Femtocell is predicted to extend the network coverage and eventually boost the network capacity for indoor subscribers. Traditionally, the spectrum allocation for the Femtocell is from the similar spectrum bands that are being used by the Microcell. Obviously, the capacity of the Femtocell is quite limited due to the spectrum constraint and the interference between Microcell and Femtocell network. These issues motivate the study to mitigate the interference and to increase the network capacity by focusing on the spectrum scarcity problem and the tremendous increase of indoor users. The first part of the thesis is focused on the downlink performance of Femtocell configuration deployed in LTE network. The coverage performance is presented as the percentage of satisfied users achieving a data rate above a minimum requirement, in the range of 90-95% coverage. The walk test performance is evaluated in real time network scenarios, including realistic macro network layouts in homogeneous spatial traffic distributions. Then, by considering the Fractional Frequency Reuse (FFR) scheme to mitigate the interferences, a simulation experiment was conducted. The objective of this study is to boost up the overall throughput and user's satisfaction. In the meantime, it has been shown that the spectrum is not efficiently used by licensed (primary) users according to the exclusive spectrum allocation regulation. Hence the Cognitive Femtocell (CogFem) network has been proposed based on the greedy algorithm to allow unlicensed users to exploit spectrum opportunities from primary systems to enhance the spectrum utilization and mitigate interference. Both functions of frequency channel allocation and transmission power adjustment are proposed. The final contribution presented in this thesis is the Strategic CogFem Spectrum Sensor Scheme (SCFSSS) with the focus on cooperative spectrum sensing to minimize the duration to sense the available bandwidth and avoid the false alarm as well as mitigate the interference and improve user's throughput in a licensed or unlicensed spectrum. The comparisons between local sensing and cooperative sensing are presented. In the proposed SCFSSS mechanism the Femtocell Access Point (FAP) cooperates with Femtocell Users (FUs) as the sensing nodes. The final decision will be decided by the FAP. The results presented have shown 60% improvements by providing enough bandwidth capacity to accommodate the sudden increase of mobile subscribers.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ismail, Izwah
author_facet	Ismail, Izwah
author_sort	Ismail, Izwah
title	Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail
title_short	Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail
title_full	Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail
title_fullStr	Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail
title_full_unstemmed	Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail
title_sort	balanced femtocell model to enhance indoor coverage in lte cellular network / izwah ismail
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Electrical Engineering
publishDate	2017
url	https://ir.uitm.edu.my/id/eprint/39339/1/39339.pdf
_version_	1783734506401824768

Balanced femtocell model to enhance indoor coverage in LTE cellular network / Izwah Ismail

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