Journal of Advanced Navigation Technology (한국항행학회논문지)

The Korean Navigation Institute (한국항행학회)
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TOA-Based Ranging Method using CRS in LTE Signals

LTE 신호의 CRS를 이용한 TOA 기반 거리 측정 방법

  • Kang, Taewon (School of Integrated Technology, Yonsei University) ;
  • Lee, Halim (School of Integrated Technology, Yonsei University) ;
  • Seo, Jiwon (School of Integrated Technology, Yonsei University)
  • 강태원 (연세대학교 글로벌융합공학부) ;
  • 이하림 (연세대학교 글로벌융합공학부) ;
  • 서지원 (연세대학교 글로벌융합공학부)
  • Received : 2019.09.25
  • Accepted : 2019.10.24
  • Published : 2019.10.31
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Abstract

In this paper, a new algorithm for the calculation of the range between an LTE base station (BS) and a user equipment (UE) using time-of-arrival (TOA) measurements of LTE signals is proposed. First, the cell identity (cell ID) of the received signal is acquired using the primary synchronization signal (PSS) and secondary synchronization signal (SSS) to identify the BS transmitted the signal. The proposed algorithm exploits the cell-specific reference signal (CRS), the reference sequence inserted in commercial LTE signals, to estimate the time delay using 2D cross-correlation. The obtained TOA estimations can be used to calculate the range employed from the known BS location. The performance of the proposed algorithm is evaluated with the experiment performed using real LTE signals transmitted from the commercial BS.

본 논문에서는 LTE 기지국 (BS; base station)과 단말기 (UE; user equipment) 간의 거리를 신호 도달 시간 (TOA; time-of-arrival)을 이용해 계산하는 알고리즘을 소개하였다. 먼저, 수신된 신호를 발신한 기지국을 판별하기 위해 primary synchronization signal (PSS)와 secondary synchronization signal (SSS)를 이용하여 셀 아이디를 취득하였다. 제시된 알고리즘에서는 상용 LTE 신호에 포함된 기준 시퀀스인 cell-specific reference signal (CRS)를 구축된 자원 그리드에서의 2차원 상호 상관을 통해 지연 시간을 계산하였다. 지연 시간의 변화는 신호 도달 시간의 변화로 계산되어 알려진 BS의 위치로부터 UE와의 거리를 계산하는 과정에 사용할 수 있다. 제시된 알고리즘의 성능은 실제 환경에서의 상용 LTE 신호를 이용한 거리 계산 실험에 사용되어 평가되었다.

Keywords

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