한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

  • 제39C권3호
  • /
  • Pages.264-274
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  • 2014
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  • 1226-4717(pISSN)
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  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지
DOI QR코드

DOI QR Code

수중 음향 네트워크를 위한 시간 동기화 기술 동향 분석에 대한 연구

A Survey of Time Synchronization Techniques in Underwater Acoustic Networks

  • 조아라 (한국해양과학기술원 선박플랜트연구소 해양시스템연구부) ;
  • 윤창호 (한국해양과학기술원 선박플랜트연구소 해양시스템연구부) ;
  • 임용곤 (한국해양과학기술원 선박플랜트연구소 해양시스템연구부)
  • 투고 : 2013.12.17
  • 심사 : 2014.02.28
  • 발행 : 2014.03.31
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초록

수중음향 네트워크를 이용한 다양한 수중 어플리케이션에서 노드들은 서로 통신을 통하여 협업 또는 자율 독립적으로 동작하기 때문에 노드들 간 시간 동기화 문제는 중요한 이슈가 되고 있다. 또한, 수중 음향네트워크에서는 육상 네트워크에서와 달리 GPS 사용불가, 긴 전파지연, 해류에 의한 노드의 이동, 제한적 전력소비, 낮은 전송속도 등의 고유의 제약 사항이 있어 수중 노드들의 시간 동기화를 위해서는 이러한 제약 들이 반드시 고려된다. 본 논문에서는 수중음향 네트워크를 위해 보다 효율적인 시간 동기화 프로토콜 개발을 위해, 현재까지 개발되었던 수중 동기화 프로토콜의 특징을 비교 분석하여 현재 (state-of-the-art) 수중 음향 네트워크 동기화 연구 동향의 흐름을 정리한다.

Time synchronization becomes a critical issue in underwater acoustic networks (UANets) because nodes cooperate together or individually work by communicating each other in diverse underwater applications. Compared with the time synchronization approaches in terrestrial networks, several intrinsic limitations of UANets (e.g., the unavailability of GPS, long propagation delay, mobility due to currents, limited energy consumption, or low data rate) need to be considered in synchronizing the timing among underwater nodes. For the purpose of developing more efficient time synchronization protocols for UANets, we review the existing approaches, which estimate both the clock offset and the clock skew of underwater nodes. Finally, we outline the state-of-the art time synchronization protocols for UANets by comparing and summarizing them according to their synchronization characteristics.

키워드

참고문헌

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