이동통신 시스템의 단일 통신채널에 20MHz 이상의 광대역 주파수 할당하는 것은 IMT-Advanced 시스템의 요구 사항을 만족시키기 위하여 필수적인 요소로 인식되고 있으나 이동통신 시장의 역사로 볼 때 이것은 이례적인 것이어서 이러한 광대역화를 실현하기 위하여 많은 기술검토가 이루어 지고 있다. 사업자 입장에서 연속적인 광대역 스펙트럼 을 할당 받는 것이 용이한지에 대한 현실적인 고민과 함께 또한 450MHz부터 3,600MHz 사이에 산재되어 있는 여러 IMT 주파수 대역이 전반적으로 사용될 수 있도록 조각난 작은 대역을 효율적으로 사용하기 위한 방안이 활발히 논의 되고 있다. 이러한 논의의 일환으로 본 논문에서는 IMT-Advanced 표준의 후보기술로 제안될 LTE-Advanced 기술 에 적용을 검토 중인 광대역화 기술에 대한 3GPP RAN의 표준화 동향을 알아보고 그 표준에 호환이 요구되는 차세대 단말 RF 구현기술의 최근 동향을 살펴본다.
KSP Keywords
IMT-Advanced, LTE-Advanced
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