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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Interference Space Reuse and the Adoption Strategy through QoS Constraints in Three-Cell Downlink MIMO Interference Channels

3-Cell 하향링크 MIMO 간섭 채널에서의 간섭 공간 재활용 및 QoS Constraint에 따른 그 적용 방안

  • 윤장호 (KAIST 전기 및 전자공학과 이동통신 연구실) ;
  • 이황수 (KAIST 전기 및 전자공학과 이동통신 연구실)
  • Received : 2012.09.24
  • Accepted : 2012.12.04
  • Published : 2012.12.28
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Abstract

We propose an interference space reuse (ISR) algorithm for the MU-MIMO design in 3-cell downlink interference channels. Also, we provide a strategy for the adoption of the ISR scheme in the cellular network. In the multicell interference channels, the cell edge users may undergo severe interferences and their signals should be protected from the interferers for reliable transmissions. However, the intra cell users do not only experience small interferences but also they require small transmission power for stable communication. We provide a vector design algorithm based on ISR, where intra cell users are served through reusing the cell edge users' interference space. The performance enhancement reaches 20% compared to the fractional frequency reuse (FFR) scheme combined with IA through the scheduling between the cell edge users and the intra cell users. Also, it can be used to enhance the cell edge throughput when the quality of service (QoS) requirements of the intra cell users are fixed.

본 논문에서는 3-Cell 간섭 환경에서의 하향링크 MU-MIMO를 위한 간섭 공간 재활용 기술 (ISR)과 그 적용방안을 제시한다. 멀티 셀 간섭환경의 셀 경계 사용자들의 안정적인 통신을 위해서는 효율적인 간섭 관리가 필요하다. 하지만 셀 중심부의 사용자들의 경우 간섭의 영향을 적게 받으며 적은 전송 전력으로도 안정적인 통신이 가능하다. 본 논문에서는 셀 경계 사용자의 간섭 공간을 재사용하여 셀 중심부 사용자에게 서비스를 제공하는 ISR 기반 전송 신호 설계 방법을 제시한다. ISR 방식은 간섭정렬(IA)과 결합된 부분적 주파수 재활용 (fractional frequency reuse : FFR) 방식과 비교하여 볼 때 셀 중심 사용자와 셀 경계 사용자에 대한 scheduling에 따라 전체 네트워크 데이터 전송용량 측면에서 20%의 성능 향상을 보이며 또한 셀 중심 사용자의 서비스 품질 (QoS) 요구조건이 고정되어 있는 경우 ISR 방식에 의해 기지국에서의 전송 신호 벡터를 설계함으로서 셀 경계 사용자의 데이터 전송 용량을 증가시킬 수 있다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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