Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Beamforming and User Scheduling for Device-to-Device Underlaying Cellular Networks

셀룰러 네트워크에서 D2D 통신을 고려한 빔 형성 및 스케줄링 기법

  • Received : 2011.11.22
  • Accepted : 2012.02.17
  • Published : 2012.02.25
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Abstract

In this paper, the beamforming and user scheduling scheme for device-to-device (D2D) underlaying celullar networks with partial channel state information is investigated. In the proposed scheme, cellular users whose channels are nearly orthogonal to the channel between base station and D2D receiver are selected for unitary beamforming so as to minimize the interference to the D2D receiver. The interference caused by underlaying D2D communication can be minimized by reducing the D2D transmitter's transmission power. To enhance the cellular users' throughput further, we also investigate codebook generation method in which each code vector belongs to multiple unitary code matrices. From simulation results, we show that the proposed beamforming and user scheduling scheme mitigates D2D interference to the cellular networks and the codebook generation method improves cellular users' throughput.

본 논문에서는 Device-to-Device (D2D) 통신 시스템이 셀룰러 단말기들과 하향 링크의 주파수 자원을 공유할 때 D2D 통신으로 인한 간섭을 완화하기 위한 빔 형성 및 스케줄링 기법을 제안한다. 유니터리 행렬을 이용한 빔 형성 기법과 양자화된 채널 상태 정보의 되먹임 방식을 사용하는 셀룰러 기지국이 D2D 수신 단말기에 미치는 간섭이 최소화되도록 전송 가중치 행렬과 셀룰러 단말기를 선택한다. 기지국으로부터 D2D 수신 단말기에 미치는 간섭을 줄여 D2D 송신 단말기의 전송 전력을 줄임으로써 D2D 통신이 셀룰러 단말기에 미치는 간섭을 최소화한다. 이때 가중치 행렬의 선택을 제한함으로써 발생하는 셀룰러 단말기들의 총 전송률의 저하를 개선하기 위하여 각 코드 벡터가 1개 이상의 유니터리 행렬에 포함되도록 코드북을 구성한다. 모의실험을 통해 제안하는 방식이 D2D 통신으로 인한 간섭을 완화시킬 뿐만 아니라 개선된 코드북을 사용함으로써 셀룰러 단말기의 총 전송률도 향상시킬 수 있음을 보인다.

Keywords

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