Voronoi cell geometry based dynamic Fractional Frequency Reuse for OFDMA cellular networks

Ullah, Rahat; Fisal, Norsheila; Safdar, Hashim; Maqbool, Wajahat; Khalid, Zubair; Khan, Adnan Shahid

doi:10.1109/icsipa.2013.6708046

Cited by 17 publications

(8 citation statements)

References 13 publications

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Section: B a Methods Based On Centroidal Voronoi Tessellationsmentioning

confidence: 99%

“…The points in L are known as generators of the Voronoi diagram. Voronoi diagrams have extensively been used in the analysis of cellular networks [20][21][22] because the definition of the Voronoi regions is consistent with the coverage areas (cells) of different Base Stations (BSs), i.e., under the assumption that BSs transmit pilots (used for cell selection [23]) with the same power, cells would correspond to regions defined by (7). If pilots are transmitted with different power levels, power Voronoi diagrams [8] can be used to determine cell regions.…”

Section: B a Methods Based On Centroidal Voronoi Tessellationsmentioning

confidence: 99%

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Spatial Mappings for Planning and Optimization of Cellular Networks

Gonzalez

Hakula

Rasila

et al. 2018

IEEE/ACM Trans. Networking

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In cellular networks, users are grouped into different cells and served by different access points (base stations) that provide wireless access to services and applications. In general, the service demand is very heterogeneous, non-uniformly distributed, and dynamic. Consequently, radio access networks create very irregular topologies with more access points where service demand is concentrated. While this dynamism requires networks with the ability to adapt to time-varying conditions, the non-uniformity of the service demand makes the planning, analysis, and optimization difficult. In order to help with these tasks, a framework based on canonical domains and spatial mappings (e.g., conformal mapping) have recently been proposed. The idea is to carry out part of the planning in a canonical (perfectly symmetric) domain that is connected to the physical one (real-scenario) by means of a spatial transformation designed to map the access points consistently with the service demand. This paper continues the research in that direction by introducing additional tools and possibilities to that framework, namely the use of centroidal Voronoi algorithms and non-conformal composite mappings. Moreover, power optimization is also introduced to the framework. The results show the usability and effectiveness of the proposed method and its promising research perspectives. I. INTRODUCTION A. Context and motivationRadio access planning and optimization are fundamental tasks in cellular networks. Broadly speaking, planning refers to the tasks of determining the number, location, and configuration of access points to provide wireless access to users (and things) to services and applications, with a certain targeted Quality of Service (QoS). In particular, the problem of finding the number of access points is also referred to as dimensioning [1], and this initial step aims at providing the required capacity for the service demand volume that is expected. However, in practice, both dimensioning and sites positioning are very difficult problems because the service demand is not uniformly distributed and it is quite diverse and dynamic. Nowadays, taking into account the continuous evolution of radio access technologies, and the new concepts and paradigms that are expected for the fifth generation (5G) of cellular networks, the boundary between planning and optimization tasks becomes blurred. Indeed, according to the excellent work presented in [1], planning and optimization are iterative tasks that go hand-in-hand. In this line of thinking, the authors of [2] also pose the need for re-thinking planning. They emphasize the importance of distributing the service demand as evenly as possible among cells as a key criterion to achieve effective planning; a goal that in the opinion of the authors of [2] (and in our's) is a very valid way to enhance system performance.In our previous work [3], also motivated by the aforementioned ideas, a novel framework for planning and optimization based on the use of canonical domains and spatial transforma...

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Section: B a Methods Based On Centroidal Voronoi Tessellationsmentioning

confidence: 99%

Section: B a Methods Based On Centroidal Voronoi Tessellationsmentioning

confidence: 99%

Spatial Mappings for Planning and Optimization of Cellular Networks

Gonzalez

Hakula

Rasila

et al. 2018

IEEE/ACM Trans. Networking

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“…Consequently, the FFR scheme designed based on the unrealistic assumptions of the regular geometry models lead to inaccurate results [10]. These considerations have sparked the research directions and FFR schemes based on irregular cell geometry models have been proposed in the literature [58][59] [60].…”

Section: B Ffr Approaches In Irregular Geometry Cellular Networkmentioning

confidence: 99%

A Review of Inter Cell Interference Management in Regular and Irregular Geometry Cellular Networks

Ullah

Khalid

et al. 2021

Jurnal Teknologi

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This paper reviews the inter-cell interference (ICI) mitigation approaches in the OFDMA based multicellular networks with more emphasis on the frequency reused based ICI coordination schemes in the downlink systems. The geometry of the network severely affects the Signal to Interference and Noise Ratio (SINR); therefore, the wireless cellular systems are strongly dependent on the spatial BSs configuration and topology of a network. ICI mitigation techniques for both regular and irregular geometry networks are analyzed and a qualitative comparison along with the future research directions are presented.

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“…Moreover, dynamic spectrum utilization with FFR configuration is required to be optimized when applied to the irregular geometry cellular network [10]. The dynamic spectrum allocation in FFR enables the available spectrum to be divided following the network variants and miscellaneous traffic demands [11]- [13].…”

Section: Related Workmentioning

confidence: 99%

Hungarian Mechanism based Sectored FFR for Irregular Geometry Multicellular Networks

Ullah

Khalid

Sandhu

et al. 2021

EMITTER Int'l J. of Engin. Technol.

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The growing demands for mobile broadband application services along with the scarcity of the spectrum have triggered the dense utilization of frequency resources in cellular networks. The capacity demands are coped accordingly, however at the detriment of added inter-cell interference (ICI). Fractional Frequency Reuse (FFR) is an effective ICI mitigation approach when adopted in realistic irregular geometry cellular networks. However, in the literature optimized spectrum resources for the individual users are not considered. In this paper Hungarian Mechanism based Sectored Fractional Frequency Reuse (HMS-FFR) scheme is proposed, where the sub-carriers present in the dynamically partitioned spectrum are optimally allocated to each user. Simulation results revealed that the proposed HMS-FFR scheme enhances the system performance in terms of achievable throughput, average sum rate, and achievable throughput with respect to load while considering full traffic.

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Voronoi cell geometry based dynamic Fractional Frequency Reuse for OFDMA cellular networks

Cited by 17 publications

References 13 publications

Spatial Mappings for Planning and Optimization of Cellular Networks

Spatial Mappings for Planning and Optimization of Cellular Networks

A Review of Inter Cell Interference Management in Regular and Irregular Geometry Cellular Networks

Hungarian Mechanism based Sectored FFR for Irregular Geometry Multicellular Networks

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