A Survey on Inter-Cell Interference Coordination Techniques in OFDMA-Based Cellular Networks

Abstract

Abstract-Orthogonal Frequency Division Multiplexing Access (OFDMA) has been increasingly deployed in various emerging and evolving cellular systems to reduce interference and improve overall system performance. However, in these systems InterCell Interference (ICI) still poses a real challenge that limits the system performance, especially for users located at the cell edge. Inter-cell interference coordination (ICIC) has been investigated as an approach to alleviate the impact of interference and improve performance in OFDMA-based systems. A common ICIC technique is interference avoidance in which the allocation of the various system resources (e.g., time, frequency, and power) to users is controlled to ensure that the ICI remains within acceptable limits. This paper surveys the various ICIC avoidance schemes in the downlink of OFDMA-based cellular networks. In particular, the paper introduces new parameterized classifications and makes use of these classifications to categorize and review various static (frequency reuse-based) and dynamic (cell coordination-based) ICIC schemes.

Throughput Analysis and Optimization of Multi-layer FFR-aided OFDMA Networks

“…The downlink channel is subject to path loss and smallscale fading 2 . The path loss characterising the link between the bth BS and the uth MS can be modeled as…”

“…In contrast, the well-known reuse-3 scheme decreases ICI but sacrificing spectral efficiency. With the aim of mitigating ICI experienced by the cell-edge users while still achieving high spectral efficiencies, multiple ICI control (ICIC) strategies have been proposed [2], among which, static fractional frequency reuse (FFR) and all its variants show a good tradeoff among cell-edge throughput enhancement, provision of high spectral efficiency and implementation complexity [3].…”

Interference Management in Lte Downlink Networks

“…The RB pairs (in time domain) are allocated to a UE for data transmission in a TTI (Transmission Time Interval= 1ms). Inter-cell interference is caused as a result of collisions between RBs that are utilized by multiple cells simultaneously [6,7]. The PRBs reusing by UEs located at adjacent cells result in ICI in OFDMA systems [8].…”

“…cell centre or cell edge) in which the set of subcarriers (channels) are utilized. Various frequency reuse schemes specify different values for these parameters [6].…”

“…time/frequency/power) is controlled to increase signal to interference and noise ratio, SINR; thereby throughput, for cell edge users and to make sure ICI will be within tolerable limits [6]. Interference avoidance strategy ensures better services for users located at cell edge without sacrificing cell centre users' throughput.…”