Mitigation of inter-cell interference in the WiMAX system

Yeom, Jae-Heung; Lee, Yong-Hwan

doi:10.1109/wimax.2007.348681

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…WiMAX mobile devices are known to have severe communication qualities due to signal degradation in cell boundaries and shaded areas [1]. To solve this problem, various researches attempt to increase signal sensitivity in those areas [1] [2]. For instance, vehicles can be equipped with WiMAX antenna on the roof or glass of the vehicle so that the mobile devices can increase receiver signal sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…1) that transparently distributes the WiMAX data to mobile users to augment the WiMAX data service. One of the potential technologies achieving this goal would be via wireless local area network (WLAN) such as IEEE 802.11 1 (we hereafter use AP and vehicle interchangeably for this reason). However, if a significant number of APs are densely located, the throughput of the mobile devices will be tremendously degraded due to interference among the WiFi networks.…”

Section: Introductionmentioning

confidence: 99%

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Mobility-Aware Interference Avoidance Scheme for Vehicular WLANs

Park¹

2011

KSII TIIS

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Communication technology of future networks is predicted to provide a large variety of services including WiFi service in vehicular network. In this paper, we assume that vehicles are embedded with WiMAX antenna and in-vehicle terminals receive WiMAX traffic through WiFi interface. This assumption will impose severe performance degradation due to interference among mobile BSSs when WiFi access points (APs) are densely located. Existing interference avoidance techniques cannot properly resolve the above problems and do not cope with dynamically moving vehicular scenario since they focus only on the fixed network topology. In this paper, we propose a mobility-aware interference avoidance scheme for WiFi services. The proposed scheme computes the interference duration by exploiting mobility vector and location information of neighboring APs. If the interference duration is not negligible, our scheme searches for another channel in order to avoid interference. However, if the interference duration is negligible, our scheme continues to use the channel to reduce switching overhead. To measure the effectiveness of the proposed scheme against other existing techniques, we evaluated performance by using OPNET simulator. Through the simulation, we obtained about 60% reduction in the maximum interference frequency and about 67% improvement in throughput. Furthermore, our scheme provides fair channel usage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mobility-Aware Interference Avoidance Scheme for Vehicular WLANs

Park¹

2011

KSII TIIS

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“…In recognition of its importance, different schemes have been proposed to mitigate inter-cell interference in OFDMAbased systems [4]- [7]. However, most of such schemes rely strongly on careful system-wise frequency planning.…”

Section: Introductionmentioning

confidence: 99%

Inter-Cell Interference Management in WiMAX Downlinks by A Stackelberg Game between BSs

Chen

Teo²,

Kishore

et al. 2008

2008 IEEE International Conference on Communications

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We develop a game theoretic framework for effective and adaptive inter-cell interference management in the OFDMA-based WiMAX/3GPP-LTE systems. Such approach requires no fixed spectrum planning beforehand and does not affect the spectrum usage for users that are not subject to inter-cell interference. Based on the handoff mechanisms in WiMAX systems, we also examine means of categorizing users who are, or are not, subject to potential interference. Different optimization opportunities for BSs are identified and analyzed. The interactions between BSs are modeled by a Stackelberg game in which BSs can make intelligent and rational decisions to reduce interference with minimum optimization cost. The algorithm to attain stable Nash Equilibrium is investigated and the behaviors of BSs with different preferences in the game are examined ICC 2008This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved.

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“…Most schemes recently developed to reduce inter-cell interference in OFDMA systems (such as WiMAX and 3GPP-LTE) stem from the channel assignments in conventional cellular systems [10], and are usually base-station-centric [5]∼ [8]. These schemes typically require careful spectrum planning among different cells.…”

Section: Introductionmentioning

confidence: 99%

A Game-Theoretic Framework for Interference Management through Cognitive Sensing

Chen

Teo

Kishore

et al. 2008

2008 IEEE International Conference on Communications

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A game theoretic framework is developed in this paper to facilitate inter-cell interference management through cognitive sensing distributively performed by mobile stations (MSs). Using stochastic geometry, we reveal the relationship between the effectiveness of interference management and MSśẅillingnessẗo perform cognitive sensing. Such cognitive sensing performed by MS is motivated by the associated beneficial results as well as by the rewards from base stations (BS) that encourage sensing. Different tradeoffs for BS and MSs exist in their interactions, which are modeled as a stackelberg game in this paper. While both BS and MS seek to manage interference at its own minimum cost, we design algorithm to achieve nash Equilibrium in such a game and investigate the optimal strategies taken by the players (BS and MSs). ICC 2008This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Abstract: A game theoretic framework is developed in this paper to facilitate inter-cell interference management through cognitive sensing distributively performed by mobile stations (MSs). Using stochastic geometry, we reveal the relationship between the effectiveness of interference management and MS's "willingness" to perform cognitive sensing. Such cognitive sensing performed by MS is motivated by the associated beneficial results as well as by the rewards from base station(BS) that encourage sensing. Different tradeoffs for BS and MSs exist in their interactions, which are modeled as a Stackelberg game in this paper. While both BS and MS seek to manage interference at its own minimum cost, we design algorithm to achieve Nash Equilibrium in such a game and investigate the optimal strategies taken by the players (BS and MSs).

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Mitigation of inter-cell interference in the WiMAX system

Cited by 6 publications

References 10 publications

Mobility-Aware Interference Avoidance Scheme for Vehicular WLANs

Mobility-Aware Interference Avoidance Scheme for Vehicular WLANs

Inter-Cell Interference Management in WiMAX Downlinks by A Stackelberg Game between BSs

A Game-Theoretic Framework for Interference Management through Cognitive Sensing

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