The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Cooperative Transmission Scheme for OFDMA Based Enterprise Femtocell Networks

OFDMA 기반의 기업형 펨토셀 네트워크를 위한 협력 통신 기법

  • 김승연 (고려대학교 전자정보공학과 B-ISDN 연구실) ;
  • 이상준 (고려대학교 컴퓨터정보학과 BCN 연구실) ;
  • 류승완 (중앙대학교 정보시스템학과) ;
  • 조충호 (고려대학교 컴퓨터정보학과 BCN 연구실) ;
  • 이형우 (고려대학교 전자정보공학과 B-ISDN 연구실)
  • Received : 2012.01.04
  • Accepted : 2012.04.26
  • Published : 2012.05.30
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Abstract

In this paper, we propose the cooperative transmission scheme (CTS) for system throughput maximization in OFDMA based enterprise femtocell networks. In our scheme, the user equipment (UE) can receive the desired signal from serving femtocell BS (fBS) as well as an adjacent fBS. Thus, UE achieves an improved signal to interference plus and noise ratio (SINR) by the synchronized two signals. The performances of this strategy consider not only the call-level quality of service (QoS) but also the packet-level QoS. We first measure the call blocking probability and utilization for the downlink resources for various offered load in femtocell. Based on that, the outage probability and effective throughput of the system are simulated. Simulation results show that the proposed scheme can reduce the outage probability for enterprise femtocell compared with conventional systems.

본 논문에서는 OFDMA 기반의 기업형 펨토셀 네트워크 환경에서 펨토셀의 성능 향상을 위한 협력 통신 기법(cooperative transmission scheme; CTS)을 제안한다. 제안된 알고리즘에서 UE(user equipment)는 현재 접속 중인 fBS(serving femtocell base station)에서 뿐만 아니라 주변 fBS에서 원하는 신호(desired signal)를 받게 된다. 따라서 UE는 동기화된 두 개의 신호에 의해 향상된 신호 대 간섭 잡음 비(SINR)를 얻게 된다. 알고리즘의 성능 평가를 위해 콜 레벨 QoS(quality of service)와 패킷 레벨 QoS를 성능 지표로 나타낸다. 먼저 다양한 offered load에서 하향 링크 자원에 대한 호 차단 확률과 자원 사용률을 측정한다. 그리고 측정된 값을 사용하여 시스템의 outage 확률과 시스템 처리량(effective throughput)을 시뮬레이션 한다. 시뮬레이션 결과를 통해 제안된 알고리즘이 기존 시스템에 비해 시스템 처리량에서 향상된 성능을 가짐을 보인다.

Keywords

References

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