최근 셀룰라 네트워크의 주파수 효율을 높이고 다양한 사용자 경험을 제공하기 위하여 단말간 직접 통신(device-to-device, D2D) 기술이 주목을 받고 있다. 본 논문에서는 D2D 관련 표준 및 기존 연구에 대한 선행 조사를 통하여 D2D 통신이 가지는 많은 장점들과 이 장점들이 제대로 실제 시스템에 적용되기 위해서 해결되어야 할주요 문제점들에 대해서 살펴본다. 특히, 가장 중요시 되는 셀룰라 링크와 D2D 링크간의 간섭 이슈를 고려하여 5가지 D2D 자원할당 및 간섭제어 시나리오에 대해 시스템 레벨 시뮬레이션을 수행한다. 성능 분석 결과, D2D를사용할 경우에 주파수 재사용 및 데이터 오프로딩(off-loading) 효과로 인해 전체 셀 용량 및 D2D 사용자 전송률이 현저히 증가하며, 이들 성능을 최대화하는 최적 D2D 통신 허용 반경값이 존재함을 알 수 있다.
KSP Keywords
Device to Device(D2D), off-loading
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