01423nas a2200169 4500008004100000245007800041210006900119260001300188300001500201520081300216653000801029100002101037700002201058700002401080700002101104856012801125 2013 eng d00aFractional Frequency Reuse in Integrated Femtocell/Macrocell Environments0 aFractional Frequency Reuse in Integrated FemtocellMacrocell Envi cJune 5-7 a 229 - 2403 a

Femtocells have a strong potential for increasing the efficiency, cell coverage and network capacity of next-generation mobile networks. In Long Term Evolution technology, the adaptation of Fractional Frequency Reuse techniques has been proposed in order to overcome the co-channel interference and augment the total throughput of the network. In this work, we propose a Fractional Frequency Reuse method that on the one hand calculates the optimal inner region radius and frequency allocation of a macrocell and on the other hand assigns frequency resources to the femtocells in order to mitigate the co-channel interference. We apply this method in an integrated femtocell/macrocell environment and evaluate it based on the optimization of three metrics, depending on the network operator?s needs.

10aFFR1 aBouras, Christos1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTseliou, Georgia uhttps://telematics.upatras.gr/telematics/publications/fractional-frequency-reuse-integrated-femtocellmacrocell-environments01895nas a2200181 4500008004100000245009200041210006900133300001400202490000700216520123300223653000801456100002101464700002201485700002401507700002101531700002201552856013901574 2013 eng d00aSelecting the Optimal Fractional Frequency Reuse Scheme in Long Term Evolution Networks0 aSelecting the Optimal Fractional Frequency Reuse Scheme in Long  a2693-27120 v713 a

Long Term Evolution (LTE) networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. One limiting factor that influences LTE performance is the interference from neighbouring cells, the so called Inter-Cell Interference (ICI). The investigation of ICI mitigation techniques has become a key focus area in achieving dense spectrum reuse in next generation cellular systems. Fractional Frequency Reuse (FFR) has been proposed as a technique to overcome this problem, since it can efficiently utilize the available frequency spectrum. This manuscript proposes a dynamic mechanism that selects the optimal FFR scheme based on a custom metric, which is called user satisfaction. In detail, the proposed mechanism divides the cell into two regions, the inner and outer region, and selects the optimal size as well as the optimal frequency allocation between these regions with main target to maximize the user satisfaction metric. The proposed mechanism is evaluated through several simulation scenarios that incorporate users? mobility and its selected FFR scheme is compared with other frequency reuse schemes in order to highlight its performance.

10aFFR1 aBouras, Christos1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTseliou, Georgia1 aBilios, Dimitrios uhttps://telematics.upatras.gr/telematics/publications/selecting-optimal-fractional-frequency-reuse-scheme-long-term-evolution-networks01491nas a2200181 4500008004100000245009400041210006900135260001600204520082500220653001401045653000801059653000801067100002101075700002201096700002401118700002501142856014201167 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 uhttps://telematics.upatras.gr/telematics/publications/interference-management-lte-femtocell-systems-using-adaptive-frequency-reuse-scheme01525nas a2200193 4500008004100000245007900041210006900120260001400189300001400203520086100217653000801078653000801086100002101094700002201115700002401137700002101161700002201182856012701204 2012 eng d00aOptimization of Fractional Frequency Reuse in Long Term Evolution Networks0 aOptimization of Fractional Frequency Reuse in Long Term Evolutio c1-4 April a1875-18793 aIn cellular systems, Fractional Frequency Reuse (FFR) partitions each cell into two regions; inner region and outer region and allocates different frequency band to each region. Since the users at the inner region are less exposed to inter-cell interference, the frequency resources in each inner region can be universally used. Based on this frequency band allocation, FFR may reduce channel interference and offer large system capacity. This paper proposes a mechanism that selects the optimal FFR scheme based on the user throughput and user satisfaction. In detail, the mechanism selects the optimal size of the inner and outer region for each cell as well as the optimal frequency allocation between these regions that either maximizes the mean user throughput or the user satisfaction. The mechanism is evaluated through several simulation scenarios.10aFFR10aLTE1 aBouras, Christos1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTseliou, Georgia1 aBilios, Dimitrios uhttps://telematics.upatras.gr/telematics/publications/optimization-fractional-frequency-reuse-long-term-evolution-networks01745nas a2200193 4500008004100000245007200041210006900113260002000182300001200202520109300214653000801307653000801315100002101323700002201344700002401366700002101390700002201411856011801433 2012 eng d00aA Performance Study of Fractional Frequency Reuse in OFDMA Networks0 aPerformance Study of Fractional Frequency Reuse in OFDMA Network c19-21 September a38 - 433 a

Long Term Evolution (LTE) technology is considered as the most possible candidate for next generation mobile communications. LTE networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. One limiting factor that influences LTE performance is the interference from neighbor cells, the so called Inter-Cell Interference (ICI). Fractional Frequency Reuse (FFR) has been proposed as a technique to overcome this problem, since it can efficiently utilize the available frequency spectrum. This paper analyzes the FFR scheme and proposes a dynamic FFR mechanism that selects the optimal frequency allocation based on the cell total throughput and user satisfaction. In detail, the mechanism divides the cell into two regions (inner and outer) and selects the optimal size as well as the optimal frequency allocation between these regions with main target to maximize the overall throughput and user satisfaction. The mechanism is evaluated through several simulation scenariosthat incorporate users? mobility.

10aFFR10aLTE1 aBouras, Christos1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTseliou, Georgia1 aBilios, Dimitrios uhttps://telematics.upatras.gr/telematics/publications/performance-study-fractional-frequency-reuse-ofdma-networks