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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Novel Frequency Planning and Power Control Scheme for Device-to-Device Communication in OFDMA-TDD Based Cellular Networks Using Soft Frequency Reuse

OFDMA-TDD 기반 셀룰러 시스템에서 디바이스간 직접통신을 위한 SFR 자원할당 및 전송 전력조절 방법

  • 김태섭 (고려대학교 컴퓨터정보학과 데이터통신 및 네트워크 연구실) ;
  • 이상준 (고려대학교 컴퓨터정보학과 데이터통신 및 네트워크 연구실) ;
  • 임치헌 (고려대학교 컴퓨터정보학과 데이터통신 및 네트워크 연구실) ;
  • 류승완 (중앙대학교 정보시스템학과) ;
  • 조충호 (고려대학교 컴퓨터정보학과 데이터통신 및 네트워크 연구실)
  • Received : 2012.06.30
  • Accepted : 2012.10.04
  • Published : 2012.10.30
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Abstract

Currently, Demand of data traffic has rapidly increased by popular of smart device. It is very difficult to accommodate demand of data traffic by limited resource of base station (BS). To solve this problem, method has proposed that the Device-to-Device (D2D) reduce frequency overload of the BS and all of the user equipment (UE) inside the BS and neighbor BS don't allow communicating directly to BS. However, in LTE-Advance system cellular link and sharing radio resources of D2D link, the strong interference of the cellular network is still high. So we need to eliminate or mitigate the interference. In this paper, we use the transmission power control method and Soft Frequency Reuse (SFR) resource allocation method to mitigate the interference of the cellular link and D2D link. Simulation results show that the proposed scheme has high performance in terms of Signal to Noise Ratio (SINR) and system average throughput.

최근 스마트 단말의 보급으로 데이터 트래픽에 대한 수요가 급증하고 있어 한정된 자원을 가진 기지국이 수용하기에는 많은 어려움이 따른다. 이러한 해결책으로 셀 또는 서로 인접한 셀 내의 단말들이 서로간에 기지국을 거치지 않고 디바이스간 직접적인 통신(D2D, Device-to-Device)을 통해 기지국의 과부하를 줄이고 주파수 부족 현상을 완화시킬 수 있는 방안이 제안되고 있다. 하지만 LTE-Advanced 시스템 내에서 셀룰러 링크와 무선 자원을 공유하는 D2D 링크는 자신이 속한 셀룰러 네트워크에 심각한 간섭을 줄 가능성이 높기 때문에 간섭을 제거하거나 완화시킬 필요가 있다. 따라서 본 논문에서는 셀룰러 링크와 D2D 링크가 자신의 간섭을 최소화하는 SFR(Soft Frequency Reuse) 기반 자원할당과 전송전력 조절 방법을 제안한다. 제안된 방법의 성능검증을 위해 시뮬레이션을 수행하였으며, 결과를 통하여 신호대 잡음비(SINR, Signal to Noise Ratio)와 시스템 평균 전송량(Throughput)에서 성능 이득을 가짐을 보였다.

Keywords

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