01502nas a2200181   4500008004100000245009400041210006900135260001600204520082500220653001401045653000801059653000801067100002101075700002201096700002401118700002501142856015301167       2012                        eng d00aInterference Management in LTE Femtocell Systems Using an Adaptive Frequency Reuse Scheme0 aInterference Management in LTE Femtocell Systems Using an Adapti  c18-20 April3 aLong Term Evolution (LTE) has developed a new
technology in order to enhance indoor coverage. This new
technology is called femtocells and is achieved with the use of
access points installed by home users. However, interference
problem between the femtocell and the macrocell decreases the
system's capacity and as a result users' throughput. In this paper
we study the interference mitigation techniques in
femtocell/macrocell networks and we propose a frequency reuse
mechanism that leads to increased overall system performance.
In particular, the mechanism aims to maximize throughput via a
variety of combinations between inner cell radius and frequency
allocation to the macrocell. Additionally, a position minded
frequency allocation to the femtocells targets to further optimize
the total throughput of the cell.10aFemtocell10aFFR10aLTE1 aBouras, Christos1 aPapazois, Andreas1 aKokkinos, Vasileios1 aKavourgias, Georgios  uhttp://telematics.upatras.gr/telematics/publications/interference-management-lte-femtocell-systems-using-adaptive-frequency-reuse-scheme?language=el01531nas a2200169   4500008004100000245006500041210006300106260001900169520092900188653001401117653001801131100002101149700002201170700002401192700002001216856012501236       2012                        eng d00aPower Management over Co-channel Femtocells in LTE-A Systems0 aPower Management over Cochannel Femtocells in LTEA Systems  c21-23 November3 aThe use of femtocells has been an attractive solution since it achieves better coverage and capacity and low cost for deployment and maintenance. However, their performance can be compromised by the cross-tier interference with existing macrocell infrastructure or between adjacent femtocells, especially in the case of co-channel deployment. One way to address this, is adjusting the transmit power of every femto base station with respect for overall performance. To this direction, we have implemented a framework that simulates femtocell overlays over LTE-Advanced (LTE-A) macrocellular systems. The framework allows power management over user-defined femtocell deployment, deciding their power levels according to three different power schemes. The resulting throughput is presented for every point of the macrocell in a user-friendly GUI. In this paper, we present the design of this framework and discuss the results.10aFemtocell10aPower Control1 aBouras, Christos1 aPapazois, Andreas1 aKokkinos, Vasileios1 aDiles, Georgios  uhttp://telematics.upatras.gr/telematics/publications/power-management-over-co-channel-femtocells-lte-systems?language=el01675nas a2200181   4500008004100000245006900041210006600110260002000176300001200196520104600208653001401254653000801268100002101276700002201297700002401319700002901343856012101372       2012                        eng d00aA Simulation Framework for LTE-A Systems with Femtocell Overlays0 aSimulation Framework for LTEA Systems with Femtocell Overlays  c21 - 25 October  a85 - 903 aThe use of femtocells is an efficient way to improve cover- age and quality of service while on the other side the deployment cost for the service provider is kept in extremely low level. Long Term Evolution Advanced (LTE-A) systems with femtocell overlays aim to provide better indoor voice and data coverage and to increase network capacity. One of the major technical challenges that femtocell networks are facing nowadays, is the cross-tier interference, i.e., the interference between the femto base stations and the macrocell infrastructure. To this direction, we have designed and implemented a framework that simulates femtocell overlays integrated over LTE-A macrocellular systems. This framework focuses on the impact of cross-tier interference and furthermore is able to estimate the throughput at every point of integrated femtocell/macrocell LTE-A networks. In this paper, we present the design and implementation of this simulation framework and we provide significant experimental results obtained with the aid of this system.10aFemtocell10aLTE1 aBouras, Christos1 aPapazois, Andreas1 aKokkinos, Vasileios1 aKontodimas, Konstantinos  uhttp://telematics.upatras.gr/telematics/publications/simulation-framework-lte-systems-femtocell-overlays?language=el01680nas a2200181   4500008004100000245007300041210006900114260002600183520101400209653001401223653000801237100002101245700002201266700002201288700002401310700002901334856013501363       2011                        eng d00aInterference Behavior of Integrated Femto and Macrocell Environments0 aInterference Behavior of Integrated Femto and Macrocell Environm  cOctober 10 &#8211; 123 aAbstract—Femtocells are data access points installed by the
subscribers to provide better indoor voice and data coverage and
to increase system capacity. The integrated femtocell/macrocell
networks offer an efficient way to increase access capacity by
improving coverage and quality of service while on the other
side the deployment cost for the service provider is kept in
extremely low levels. One of the major technical challenges that
femtocell networks are facing is their interference behavior when
they are placed within macrocells. The study presented in this
paper focuses on the impact of integrating femtocells in macrocell
networks in terms of adjacent cell interference that the macrocell
environment adds to users served by a femto base station and
vice versa. To this direction, we have designed and implemented
a simulation testbed that estimates the cross-tier interference and
the throughput in every point of an integrated femtocell/macrocell
Long Term Evolution-Advanced (LTE-A) network.10aFemtocell10aLTE1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aKontodimas, Konstantinos  uhttp://telematics.upatras.gr/telematics/publications/interference-behavior-integrated-femto-and-macrocell-environments?language=el