Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Novel User Offloading Scheme for Small Cell Enhancement in LTE-Advanced System

LTE-Advanced 시스템에서 소형셀 향상을 위한 새로운 사용자 오프로딩 기법

  • Moon, Sangmi (School of Electronics & Computer Engineering Chonnam National University) ;
  • Chu, Myeonghun (School of Electronics & Computer Engineering Chonnam National University) ;
  • Lee, Jihye (School of Electronics & Computer Engineering Chonnam National University) ;
  • Kwon, Soonho (School of Electronics & Computer Engineering Chonnam National University) ;
  • Kim, Hanjong (School of Electrical, Electronics & Communication Engineering, Korea University of Technology and Education) ;
  • Kim, Cheolsung (School of Electronics & Computer Engineering Chonnam National University) ;
  • Hwang, Intae (School of Electronics & Computer Engineering Chonnam National University)
  • 문상미 (전남대학교 전자컴퓨터공학과) ;
  • 추명훈 (전남대학교 전자컴퓨터공학과) ;
  • 이지혜 (전남대학교 전자컴퓨터공학과) ;
  • 권순호 (전남대학교 전자컴퓨터공학과) ;
  • 김한종 (한국기술교육대학 정보기술공학부) ;
  • 김철성 (전남대학교 전자컴퓨터공학과) ;
  • 황인태 (전남대학교 전자컴퓨터공학과)
  • Received : 2016.03.24
  • Accepted : 2016.05.10
  • Published : 2016.05.25
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Abstract

In Long Term Evolution-Advanced (LTE-A), small cell enhancement(SCE) has been developed as a cost-effective way of supporting exponentially increasing demand of wireless data services and satisfying the user quality of service(QoS). However, due to the dense and irregular distribution of a large number of small cells, the offloading scheme should be applied in the small cell network. In this paper, we propose an user offloading scheme for SCE in LTE-Advanced system. We divide the small cells into different clusters according to the reference signal received power(RSRP) from user equipment(UE). Within a cluster, We apply the user offloading scheme with the consideration of the number of users and interference conditions. Simulation results show that proposed scheme can improve the throughput, and spectral efficiency of small cell users. Eventually, proposed scheme can improve overall cell performance.

LTE-A(Long Term Evolution-Advanced)에서는 비용 효율적 방법으로 급증하는 무선 데이터 서비스를 대처하고 사용자의 QoS(Quality of Service)를 만족시키기 위해 소형셀 향상(SCE:Small Cell Enhancement)에 대한 연구가 활발히 진행되고 있다. 하지만 수많은 소형셀이 밀집하여 불규칙하게 배치되기 때문에 오프로딩 기법이 적용되어야 한다. 본 논문에서는 LTE-Advanced 시스템에서 SCE 위한 새로운 사용자 오프로딩 기법을 제안한다. 제안 기법은 UE(User Equipment)로부터 받은 RSRP(Reference Signal Received Power)를 비교하여 소형셀의 클러스터를 구성한다. 클러스터 내에서 셀의 사용자 수와 간섭 상황을 고려하여 사용자 오프로딩을 적용한다. 모의실험 결과, 제안한 기법에서 소형셀 사용자의 전송률 및 스펙트럼 효율이 향상되어 전체적인 셀 성능이 향상 되는 것을 볼 수 있다.

Keywords

References

  1. Cisco Visual Networking Index: Global Mobile Data Traffic Forecast Update, 2010-2015. White Paper, Feb 2011.
  2. Insoo Hwang; Bongyong Song; Soliman, S.S., "A holistic view on hyper-dense heterogeneous and small cell networks," Communications Magazine, IEEE, vol.51, no.6, pp. 20,27, June 2013.
  3. Sangmi Moon, Bora Kim, Saransh Malik, Daejin Kim, and Intae Hwang, "Interference Management with Cell Selection using Cell Range Expansion and ABS in eterogeneous Network based on LTE-Advanced," Journal of The Institute of Electronics and Information Engineers Vol.50, NO.8, August 2013.
  4. Bora Kim, Sangmi Moon, Saransh Malik, Cheolsung Kim, and Intae Hwang, "Performance Analysis of Coordinated Multi-Point with Scheduling and Precoding schemes in LTE-Advanced System," Journal of The Institute of Electronics and Information Engineers Vol.50, NO.7, July 2013.
  5. Bora Kim, Sangmi Moon, Saransh Malik, Cheolsung Kim, and Intae Hwang, "Performance Analysis of CoMP with Scheduling and Precoding Techniques in the HetNet System," Journal of The Institute of Electronics and Information Engineers Vol.50, NO.8, August 2013.
  6. 3GPP TR 36.872 v12.1.0, "Small Cell Enhancements for E-UTRA and E-UTRAN - Physical Layer Aspects," December 2013.
  7. N. Umeda, "Growth and Mission of Mobile Communication," NTT DOCOMO Technical Journal, Vol.15, No.2, pp.1, Oct 2013.
  8. ElSawy, H., Hossain, E.,Dong In Kim, HetNets with cognitive small cells: user offloading and distributed channel access techniques, Communications Magazine, IEEE Vol.51 No.6, June 2013.