Interference management in OFDMA femtocell networks: issues and approaches

Abstract

One of the effective techniques of improving the coverage and enhancing the capacity and data rate in cellular wireless networks is to reduce the cell size (i.e., cell splitting) and transmission distances. Therefore, the concept of deploying femtocells over macrocell has recently attracted growing interests in academia, industry, and standardization forums. Various technical challenges towards mass deployment of femtocells have been addressed in recent literature. Interference mitigation between neighboring femtocells and between the femtocell and macrocell is considered to be one of the major challenges in femtocell networks because femtocells share the same licensed frequency spectrum with macrocell. Further, the conventional radio resource management techniques for hierarchical cellular system is not suitable for femtocell networks since the position of the femtocells is random depending on the users' service requirement. In this article, we provide a survey on the different state-of-the-art approaches for interference and resource management in orthogonal frequency-division multiple access (OFDMA)-based femtocell networks. A qualitative comparison among the different approaches is provided. To this end, open challenges in designing interference management schemes for OFDMA femtocell networks are discussed.

Interference Mitigation in CR-Enabled Heterogeneous Networks

“…Authors in [4], [22], [38], [39] provided the overview of interference mitigation methods in the HetNet. These papers further classify the interference mitigation methods by using a novel taxonomy, which identifies the major dimensions of an interference mitigation method: radio resource domain of achieving orthogonality and method of acquiring information.…”

“…Under the impact of interference, some resource blocks (RBs) composed of a number of successive orthogonal frequency division multiplexing (OFDM) symbols and carriers can not be utilized simultaneously by multiple cells, which challenges HetNet toward a universal frequency reuse [4] to share all available bandwidth among all cells. To tackle this issue, a multitude of efforts has been recently proposed to study the downlink spectrum-sharing problems between macrocells and small cells considering cross-tier interference mitigation [5]- [13], among small cells considering intra-tier interference mitigation [14]- [18], and both [19]- [24].…”

Design and Implementation of Color-Shift Keying for Visible Light Communications

“…A popular technique to compliment Wi-Fi is the use of femtocells, which are extremely short range radio frequency (RF) cell base stations that cover a small area in order to provide mobile connectivity via fixed connections such as cable or DSL. While femtocells have shown some success in household deployment, they are limited by cost and the interference they generate with outdoor base stations, limiting their proliferation [3,4,5].…”

Dynamic Channel Assignment Scheme Using Graph Coloring in Femtocell Networks

“…과 기업형 펨토망으로 분류할수 있다 [4][5][6][7][8][9] . 거주형 펨토 망의 특징은 각 댁내에 1∼3개에 해당하는 소수의 펨 토 AP가 설치되기 때문에 펨토 AP 사이의 간섭 보다 는 매크로셀과 펨토셀 사이의 간섭을 주로 고려하였 다 [4][5][6][7] .…”

“…거주형 펨토 망의 특징은 각 댁내에 1∼3개에 해당하는 소수의 펨 토 AP가 설치되기 때문에 펨토 AP 사이의 간섭 보다 는 매크로셀과 펨토셀 사이의 간섭을 주로 고려하였 다 [4][5][6][7] . 즉, 거주형 펨토망에서 채널할당 방법은 각 매 [10] .…”