04MM1100, Research on 4G Mobile Communications Technology,
Hwang Seung Ku
Abstract
이동 멀티미디어 환경에서 높은 가입자 밀도를 수용하기 위하여 마이크로-셀 또는 피코-셀과 같이 셀의 반경이 더욱 작아져야 한다. 이런 환경에서 문제가 되는 점은 셀들 사이에 빈번한 핸드오버가 발생하게 되고 이는 허용 가능한 핸드오버 처리 지연 시간을 감소시킨다는 것이다. 이것은 결국 패킷 손실뿐만 아니라 핸드오버 실패를 가져온다. 이 경우에 손실을 보상하기 위하여 재전송이 필요한데, 이는 시스템 성능의 감소를 가져온다. 따라서 본 논문에서는 고속의 전송률로 다양한 멀티미디어 서비스를 수용하는 차세대 이동통신망에서 이동 단말기의 셀 내 위치와 이동 방향 정보를 이용하여 핸드오버 셀 선택을 수행하고 핸드오프 요구 전에 핸드오버 절차를 미리 수행함으로서 핸드오버 시 멀티미디어 서비스를 제공하기 위한 방안을 제안한다. 시뮬레이션은 핸드오버 실패율과 패킷 손실률에 집중한다. 시뮬레이션 결과는 기존의 방법에 비하여 우수함을 보였다.
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