본 고는 유럽에서 IMT-2000 시스템 위성 부문의 무선 인터페이스로 개발된 유럽의 S-UMTS(Satellite Universal mobile telecommunication system)의 특징에 대하여 분석한다. S-UMTS는 ITU(International Telecommunications Union)에서 정의된 IMT-2000 위성 부문의 규격 중에서 W-CDMA(Wideband Code Division Multiple Access)기술을 채택하여 유럽에서 제안한 규격이다. 현재 유럽에서는 T-UMTS (Terrestrial UMTS)의 장점을 최대화하고 호환성을 최적화하기 위하여 이를 보완하는 작업을 진행 중이다. 현재 S-UMTS의 주파수대역은 T-UMTS의 인접대역에 할당되어 있어 로밍시 기존의 시스템보다 단말기의 비용과 크기를 줄일 수 있다. 본 고에서는 일반적인 전달 채널 특성, 위성 다이버시티, 전력 제어 그리고 셀 검색의 주제를 가지고 S-UMTS가 위성에 특화하여 수정된 부분을 중점적으로 분석하였다. 일반적으로 IMT-2000 표준 규격은 ITU에서 계속적으로 진행하고 있고 ETSI(European Tele-communications Standards Institute)가 후원하는 UMTS는 2GHz에서 동작하는 제3세대 무선 통합 시스템의 정의를 목표로 한다. UMTS는 실내 환경에서 약 2Mbps의 데이터율을 제공하고 실외 환경에서 384kbps까지 연결지향과 무지향 서비스를 광범위하게 지원한다[1]. 서비스 비트율은 호 설정시 결정할 수 있고 프레임마다 수정할 수 있다.
KSP Keywords
Code division Multiple Access(CDMA), IMT-2000, International Telecommunication Union(ITU), S-UMTS, Universal Mobile Telecommunications System(UMTS), telecommunication system, wideband code division multiple access(WCDMA)
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