5G 이동통신 시스템을 위한 Ray-Tracing 기반 28GHz 채널 모델링
Ray-Tracing Based 28 GHz Channel Modeling for 5G Communication Systems
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초록
5세대 이동통신의 주요 기술로 고려되고 있는 밀리미터파 기반의 이동통신 시스템 개발을 위하여 28GHz 대역의 도심환경 채널 전파 특성을 분석하고 이에 따른 채널 모델을 제안한다. 채널 환경 측정을 위하여 개발한 전방향 구형 스캔이 가능한 28GHz 채널 사운더 시스템을 개발하여 실험을 수행하였고 동일한 지역에 광선 추적 시뮬레이션을 수행하였다. 측정시스템의 제약으로 많은 데이터 확보가 용이하지 않아 광선 추적 결과를 측정 결과와 비교 검증 후 이를 기반으로 채널 모델 파라미터들을 도출하였다. 많은 데이터 결과 기반으로 정확도 높은 모든 3D-SCM 채널 파라미터들을 도출하였고 이결과를 측정실험, 광선 추적 시뮬레이션, 그리고 도출된 채널 모델 결과와 비교 검증을 수행하였다.
Abstract
This paper presents 28 GHz wideband propagation channel characteristics for millimeter Wave (mmWave) urban cellular communication systems. The paper compares measurements conducted with a spherical scanning 28 GHz channel sounder system, with ray-tracing simulations made for the same area. Since such scanning measurements are very costly and time-intensive, only a relatively small number of channel samples can be obtained. The measurements are thus used to quantify the accuracy of the ray tracer; the ray tracer is subsequently used to obtain a large number of channel samples and fill up gaps in the measurements. A set of mmWave radio propagation parameters is presented based on both the measurement results and ray-tracing, and the corresponding channel models following the 3GPP Spatial Channel Model (SCM) methodology are also described.
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