Mobility management and eICIC in LTE femtocells

Ghosal, Pantha

Mobility management and eICIC in LTE femtocells

Ghosal, Pantha

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Publication Type:: Thesis
Issue Date:: 2017

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Field	Value	Language
dc.contributor.author	Ghosal, Pantha
dc.date.accessioned	2017-11-16T00:52:52Z
dc.date.available	2017-11-16T00:52:52Z
dc.date.issued	2017
dc.identifier.uri	http://hdl.handle.net/10453/120199
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_AU
dc.description.abstract	LTE-Long Term Evolution was proposed in Release 8 by Third Generation Partnership Project (3GPP) with a new Radio Access Network (RAN) and an Evolved Packet Core (EPC) Network to provide a smooth migration to 4G network. The number of mobile subscribers and data usage have increased exponentially since the roll-out of LTE because of new higher capacity LTE air-interface. This has created new challenges for the network operators to provide a satisfactory quality of service to the mobile users especially in indoor scenarios. One solution to provide better indoor user experience in a cost effective manner is use of femtocells which were introduced in 3GPP LTE, Release 8. Femtocells are short ranged indoor small cells, which share the same spectrum with macrocell and could have a limited user access. Higher data rate, improved indoor coverage, QoS and longer battery life could be achieved with the deployment of femtocells. Nonetheless, the plug-and-play capability and lower cost of these small cells pose huge interference problems in uplink and downlink when installed in dense urban areas and in an unplanned way. Interference management and handover are two important factors to be considered while implementing LTE network with femtocells. The use of hard handover in 3GPP LTE and LTE-A systems coupled with the absence of a direct signaling interface between macrocell and femtocell may cause call drops and delay in mobility management. The objective of this research is to address the challenges posed by handover performance and interference mitigation in LTE system with femtocells. In this work, a speed based handover algorithm is proposed, simulated in LTE-SIM and optimized by introducing Almost Blank Sub-Frames (ABSF) and Cell Range Expansion (CRE) interference coordination schemes. Simulation results show that, better user experience can be achieved in terms of delay, fairness, reduced number of call-drops while maximizing the throughput.	en_AU
dc.format	Thesis (ME)
dc.language.iso	en_AU	en_AU
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/120199/2/02whole.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	au.edu.uts.lib/ppc
dc.title	Mobility management and eICIC in LTE femtocells	en_AU
dc.type	Thesis	en_AU
utslib.copyright.status	open_access

Abstract:

LTE-Long Term Evolution was proposed in Release 8 by Third Generation Partnership Project (3GPP) with a new Radio Access Network (RAN) and an Evolved Packet Core (EPC) Network to provide a smooth migration to 4G network. The number of mobile subscribers and data usage have increased exponentially since the roll-out of LTE because of new higher capacity LTE air-interface. This has created new challenges for the network operators to provide a satisfactory quality of service to the mobile users especially in indoor scenarios. One solution to provide better indoor user experience in a cost effective manner is use of femtocells which were introduced in 3GPP LTE, Release 8. Femtocells are short ranged indoor small cells, which share the same spectrum with macrocell and could have a limited user access. Higher data rate, improved indoor coverage, QoS and longer battery life could be achieved with the deployment of femtocells. Nonetheless, the plug-and-play capability and lower cost of these small cells pose huge interference problems in uplink and downlink when installed in dense urban areas and in an unplanned way. Interference management and handover are two important factors to be considered while implementing LTE network with femtocells. The use of hard handover in 3GPP LTE and LTE-A systems coupled with the absence of a direct signaling interface between macrocell and femtocell may cause call drops and delay in mobility management. The objective of this research is to address the challenges posed by handover performance and interference mitigation in LTE system with femtocells. In this work, a speed based handover algorithm is proposed, simulated in LTE-SIM and optimized by introducing Almost Blank Sub-Frames (ABSF) and Cell Range Expansion (CRE) interference coordination schemes. Simulation results show that, better user experience can be achieved in terms of delay, fairness, reduced number of call-drops while maximizing the throughput.

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http://hdl.handle.net/10453/120199