Inter-Cell Interference Coordination Using Fractional Frequency Reuse Scheme in Multi-Relay Multi-Cell OFDMA Systems

Saleh, Ali M.; Le, Ngon T.; Sesay, A.B.

doi:10.1109/ccece.2018.8447574

Cited by 11 publications

(3 citation statements)

References 9 publications

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“…The advantages of the FFR are that cell edge users are served disjoint spectrum and this causes higher SINR because of the low ICI. In addition to this, FFR 17 has a disadvantage that prevents using the whole available spectrum, meaning that that total system has lower throughput and spectral efficiency is less. 18 Finally, SFR 19,20 technique has been managed to improve both systems performance and spectral efficiency.…”

Section: Related Workmentioning

confidence: 99%

Dynamic resource allocation and interference coordination for millimeter wave communications in dense urban environment

Yağcıoğlu¹

2022

Trans Emerging Tel Tech

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Inter cell interference coordination (ICIC) strategies in cellular systems have vital importance for spectrum efficiency in dense urban networks. Frequency reuse and resource allocation approaches are used to overcome the interference and the efficiency problems. Users in the cell edge suffer from low throughput and signal to interference plus noise ratio. Although increasing the transmit power of the BS can be considered as a solution, it also causes ICI. Considering these difficulties, we propose a technique called Experience Based Dynamic Soft Frequency Reuse in the 5G millimeter-wave (mmWave) at 28 GHz band.The first objective of the proposed technique is to minimize the inter cell interference by using Soft Frequency Reuse method. The technique also aims to increase the overall system throughput by using Dynamic Channel Allocation.The third objective is to progress a fairness scheduler algorithm among users by optimizing the base station schedulers, which we call Experience-Based Packet Scheduler. The main purpose of this article is to find the best value for α in order to maximize the average user and cell edge user throughput while considering the users' fairness. Simulations and numerical results show that the proposed algorithm can achieve up to 30% higher performance in terms of the average user throughput rates and has better fairness for lower α values (0.3 and 0.4).

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Section: Related Workmentioning

confidence: 99%

Dynamic resource allocation and interference coordination for millimeter wave communications in dense urban environment

Yağcıoğlu¹

2022

Trans Emerging Tel Tech

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“…Cellular systems as mobile networks are based on terrestrial radio propagation and the reuse of frequencies at neighbor base stations [1]. All available frequencies are typically used in all base stations as it yields the maximal potential system capacity [2].…”

Section: Introductionmentioning

confidence: 99%

Polarization adaptation to improve cell border area bitrates and system capacity in small cells

Lempiäinen,

Sheikh,

Asp

et al. 2023

Wireless Netw

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The target of this paper is to show the impact of polarization adaptation on the received signal quality in an outdoor small-cell deployment scenario. The signal-to-interference ratio (SIR) is the key factor in defining the achievable data rate, and the capacity of the cell. At the cell border area, the SIR value is typically low and causes a significant decrease in the system capacity and achievable data rates. These bad SIR areas at the cell border can be improved by using orthogonal polarizations in the neighboring cells rather than using all polarizations over the whole cell coverage area. For the research work of this paper, a series of measurements were carried out to measure a received signal power and a cross polarization discrimination (XPD) ratio while the signal is transmitted and received with a different set of polarizations. In the measurements, we have considered horizontal, vertical, +/− 45° slanted polarizations, and two different environments, urban street and open space, and three frequency bands, 970−1030 MHz, 2000−2030 MHz and 3364−3400 MHz. The measurement results revealed that at a different distance from the transmitter, for horizontal/vertical polarization, the average XPD is around 24.7 dB and 31.7 dB in the urban street and open area environments, respectively. For +/− 45° slanted polarization, the average XPD is around 11.5 dB and 12.1 dB in the urban street and open area environments, respectively. This paper goes on to propose polarization adaptation in each cell, where the primary polarization is valid for the whole service area of the cell, and secondary polarization is only used in close proximity of the base station antenna. Considering the results, it is emphasized that system capacity can be significantly improved by having only one channel with good SIR values compared to multiple channels with bad SIR values. However, MIMO channels with orthogonal polarizations or with spatial multiplexing can be utilized in the closed vicinity of the base station, i.e., in an area with good SIR values. It is shown that the overall cell capacity can be increased by almost 35% by utilizing polarization adaptation compared to MIMO 2 × 2.

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“…The mobile network operator (MNO) utilizes the whole available spectrum in every cell, i.e., adopt a frequency reuse factor of one. However, the utilization of the same frequency spectrum in every cell causes co-channel interference, and it deteriorates the signal to interference plus noise ratio (SINR), and that in turn impacts the system capacity [1]. Moreover, a definite threshold of SINR is set to maintain a certain quality of service (QoS) requirement for the users at the cell border area.…”

Section: Introductionmentioning

confidence: 99%

Capacity Limitation of Small Cell Densification

Sheikh

Lempiainen

Jäntti

2022

2022 International Conference on Information Networking (ICOIN)

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Deployment of small cells is considered as an easy approach for adding capacity to the system. However, it is important to realize that in a non-noise limited system, each additional cell increases the interference in the system. The target of this paper is to show the capacity limitation of the cellular network with an increasing number of small cells in a network. Ultra-dense deployment of small cells implies a high probability of line of sight (LOS) transmission between the transmitter (TX) and receiver (RX). The LOS transmission helps in enhancing the received signal strength, whereas, on the other hand, the interference power significantly grows with small cell densification. This paper presents the analytical analysis of bad cell border area for one-, and two-dimensional grid of small cells. The lamp post solution for the small cell deployment along the street is studied through simulations. The acquired results show that the overall interference in the system and the bad signal to interference plus noise ratio (SINR) cell border area grows with cell densification. System capacity saturates and then starts to collapse as the capacity loss due to the additional cell interference becomes dominant over the gain of cell densification after the saturation point.

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Inter-Cell Interference Coordination Using Fractional Frequency Reuse Scheme in Multi-Relay Multi-Cell OFDMA Systems

Cited by 11 publications

References 9 publications

Dynamic resource allocation and interference coordination for millimeter wave communications in dense urban environment

Dynamic resource allocation and interference coordination for millimeter wave communications in dense urban environment

Polarization adaptation to improve cell border area bitrates and system capacity in small cells

Capacity Limitation of Small Cell Densification

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