본 논문에서는 6G 이동통신 시스템에서의 UE-triggered mobility 지원 기술을 다룬다. UE-triggered mobility 는
단말이 무선 환경 변화에 빠르게 대응하여 셀 변경을 수행할 수 있다는 점에서 6G mobility robustness 향상을 위한 핵심
후보 기술로 검토되고 있다. 그러나 5G NR 에서는 지연 시간 단축을 위해 RACH-less 방식이 도입되었음에도 불구하고,
네트워크가 단말의 실제 셀 변경 시점을 알 수 없다는 구조적 한계로 인해 불필요한 무선 자원 할당이 반복되는 문제가
존재한다. 이러한 자원 비효율은 UE-triggered mobility 의 실질적인 활용과 상용화 확대를 어렵게 하는 요인이다. 이에
본 논문에서는 NR UE-triggered mobility 의 자원 낭비 문제를 완화하기 위한 pre-notification 방식과 notification
방식을 제시한다. 또한 pre-notification 방식은 다양한 구현 방식을 비교하고, 그 중 기존 measurement report 구성을
재활용하는 방식이 최소한의 규격 변경으로 적용 가능한 현실적인 6G 후보 기술임을 보인다.
KSP Keywords
measurement report
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