Interference mitigation using uplink power control for two-tier femtocell networks

Jo, Han-Shin; Mun, Cheol; Moon, June; Yook, Jong-Gwan

doi:10.1109/twc.2009.080457

Cited by 269 publications

(10 citation statements)

References 5 publications

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“…The femtocell is preferred to be deployed in co channel fashion, which is using the same frequency bands as the macrocell, to achieve higher capacity. This in return, gives rise to severe interference management challenges [84].…”

Section: Interference Management In Femtocellsmentioning

confidence: 99%

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Interference Management in Femtocells

Zahir

Arshad

Nakata

et al. 2013

IEEE Commun. Surv. Tutorials

325

182

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Abstract-Increase in system capacity and data rates can be achieved efficiently in a wireless system by getting the transmitter and receiver closer to each other. Femtocells deployed in the macrocell significantly improve the indoor coverage and provide better user experience. The femtocell base station called as Femtocell Access Point (FAP) is fully user deployed and hence reduces the infrastructure, maintenance and operational cost of the operator while at the same time providing good Quality of Service (QoS) to the end user and high network capacity gains. However, the mass deployment of femtocell faces a number of challenges, among which interference management is of much importance, as the fundamental limits of capacity and achievable data rates mainly depends on the interference faced by the femtocell network. To cope with the technical challenges including interference management faced by the femtocells, researchers have suggested a variety of solutions. These solutions vary depending on the physical layer technology and the specific scenarios considered. Furthermore, the cognitive capabilities, as a functionality of femtocell have also been discussed in this survey.This article summarises the main concepts of femtocells that are covered in literature and the major challenges faced in its large scale deployment. The main challenge of interference management is discussed in detail with its types in femtocells and the solutions proposed over the years to manage interference have been summarised. In addition an overview of the current femtocell standardisation and the future research direction of femtocells have also been provided.

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Section: Interference Management In Femtocellsmentioning

confidence: 99%

“…The two main and common power control schemes, open loop power control and closed loop power control have also been suggested for femtocells [84]. In the open loop power control, a femtocell UE estimates the maximum allowable transmit power by estimating its cross-tier interference to the macrocell BS.…”

Section: ) Interference Avoidance In Femtocellsmentioning

confidence: 99%

Interference Management in Femtocells

Zahir

Arshad

Nakata

et al. 2013

IEEE Commun. Surv. Tutorials

325

182

View full text Add to dashboard Cite

show abstract

“…Moreover, the interferences structure can be described by the Figure 3, it is naturally known that the interferences are comprised by two main parts, which are including the interference comes from the macrocell (co-tier interference), the other is the interference comes from different femtocells (cross-tier interference). However, for the reasons of simplicity in analytically analyze and without loss the generality, it is only the interference mentioned below will be included in this report: the interference comes from different femtocell is with , F I I ; the interference comes from same femtocell is with , F F I ; the interference induces from the macro-cell is with , F C I ; and then the interference causes from CCI (co-channel interference) is with , C F I , which is able to be ignored under the condition that the distance between fetmocell and macrocell site is assumed as large enough [17].…”

Section: Description Of Channel Environmentsmentioning

confidence: 99%

On Two-Tier Femtocell over Fading Environments

Chen¹,

Chuang²,

Chiu³

et al. 2011

ENG

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In this paper the system performance of an MC-CDMA (multi-carrier coded-division multiple-access) system operating over single-cell with two-tier femtocell environment is analyzed. Consider two-tier scenario is deployed with a macrocell site in which is being surrounded several femtocells, which are designed to serve a group of subscribers locate in a small coverage area such as small office, home office or a house. The coverage area is typically up to 100 meters in radius. Mostly, the femtocell is applied to serve indoor subscribers, thus, the Rayleigh fading is adopted to characterize the propagation channel. The technique of TH-MC-CDMA (time-hopped multi-carrier coded-division multiple-access) technique is supposed to transmit each symbol alternatively with fair time (slotting)/frequency (coding) for each user in the hotspots (the area around 0 th femtocell). The intensity of signals estimated at a mobile unit located in the second tie, i.e., the femtocell coverage area, is an important issue. The contribution of the paper is mainly to evaluate the system performance with both the BER (bit error rate) and OP (outage probability) according to the most important parameters, for example, the activating user number, the hopping number provided by TH-MC-CDMA system and the subcarrier number. Furthermore, the discussion of interference avoidance is also discussed with non-analytically.

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“…Paper [6] treats the uplink interference problem in OFDMA-based femtocell networks with partial cochannel deployment. In [7], the author derives the per-tier outage probability by introducing a simplified mathematics model that provides closely approximate femtocell interference distribution. In [8], the author considers a distributed power control strategy, modeled as a noncooperative game, where users maximize their utilities in a multicell system.…”

Section: Introductionmentioning

confidence: 99%

“…In [8], the author considers a distributed power control strategy, modeled as a noncooperative game, where users maximize their utilities in a multicell system. Admittedly, the strategies proposed in [4][5][6][7][8] can mitigate cross-tier interference effectively, however, both of them haven't considered the QoS guarantee in femtocell networks.…”

Section: Introductionmentioning

confidence: 99%

A Pricing Power Control Scheme with Statistical Delay QoS Provisioning in Uplink of Two-tier OFDMA Femtocell Networks

Wen

et al. 2015

Mobile Netw Appl

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Femtocell is a promising technique to enhance indoor coverage and improve network capacity. Nevertheless, because of the random and co-channel deployment of femtocells, the macrocell will suffer serious cross-tier interference from femtocells in two-tier femtocell networks. Thus, interference mitigation in femtocell networks has been an indispensable task. Meanwhile, with the explosive popularity of smart terminals, especially smart phones and tablets, the wireless networks have loaded a mount of data services with diverse delay quality of service (QoS) requirements. However, due to the stochastically varying nature of wireless physical channel, it is extremely difficult to offer a deterministic delay guarantee in wireless networks. Therefore, the effective capacity of femtocell users (FU) has been introduced to provide a statistical delay QoS provisioning. For that reason, in this paper, we will study the interference mitigation with statistical delay QoS guarantee in uplink two-tier orthogonal frequency division multiple access (OFDMA) femtocell networks. In order to mitigate the cross-tier interference at macrocell base station (MBS), we adopt a price-based power control strategy, in which the MBS protects itself by pricing the interference from FU. Additionally, to guarantee the statistical delay QoS for each FU, effective capacity is introduced into their utility functions. Then, a Stackelberg game is formulated to study the joint utility maximization of the MBS and the FUs subject to a maximum tolerable interference power constraint Shenghua He at the MBS. Subsequently, based on the mathematical analysis of the equilibrium of the formulated Stalkeberg game, a particle swarm optimization (PSO) aided power allocation (PSOPA) algorithm is proposed to solve this optimization problem. At last, simulation results show that our proposed PSOPA algorithm can not only improve significantly the average effective capacity of each FU and guarantee their statistical delay QoS, but also converge successfully.

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Interference mitigation using uplink power control for two-tier femtocell networks

Cited by 269 publications

References 5 publications

Interference Management in Femtocells

Interference Management in Femtocells

On Two-Tier Femtocell over Fading Environments

A Pricing Power Control Scheme with Statistical Delay QoS Provisioning in Uplink of Two-tier OFDMA Femtocell Networks

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