Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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A Random Access based on Pilot-Assisted Opportunistic Transmission for Cellular IoT Networks

셀룰라 IoT 네트워크를 위한 파일럿 지원 기회적 전송 기반 임의 접속 기법

  • Kim, Taehoon (Institute of Defense Advanced Technology Research (IDAR), Agency for Defense Development (ADD)) ;
  • Chae, Seong Ho (Department of Electronics Engineering, Korea Polytechnic University)
  • Received : 2019.08.29
  • Accepted : 2019.09.20
  • Published : 2019.10.31
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Abstract

Recently, 5G cellular systems have been attracted great attention as a key enabler for Industry 4.0. In this paper, we propose a novel random access based on pilot-assisted opportunistic transmission to support internet-of-things (IoT) scenario in cellular networks. A key feature of our proposed scheme is to enable each of IoT devices to attempt opportunistic transmission of its data packet in Step 3 with randomly selected uplink pilot signal. Both the opportunistic transmission and the pilot randomization in Step 3 are effective to significantly mitigate the occurrence of packet collisions. We mathematically analyze our proposed scheme in terms of packet collision probability and uplink resource efficiency. Through simulations, we verify the validity of our analysis and evaluate the performance of our proposed scheme. Numerical results show that our proposed scheme outperforms other competitive schemes.

최근 5세대 이동통신 시스템은 4차 산업혁명의 핵심 요소로 큰 주목을 받고 있다. 본 논문에서는, 이동통신 시스템에서 사물인터넷 시나리오를 지원하기 위해 파일럿 지원 기회적 전송 기반의 새로운 임의 접속 기법을 제안한다. 제안하는 기법은 임의 접속 절차 3단계에서 데이터 패킷을 전송할 때 다수 개의 상향링크 자원 중 하나의 자원을 임의로 선택하여 기회적 전송을 하는 동시에 데이터 복호를 위해 각 데이터 패킷에 다중화하는 상향링크 파일럿 신호 또한 임의로 선택하게 함으로써 패킷 충돌 확률을 획기적으로 낮추는 것을 주요 특징으로 한다. 확률 모델을 이용하여 패킷 충돌 확률 및 상향링크 자원 효율 관점에서 제안한 기법을 수학적으로 분석 하고, 모의실험을 통해 분석의 유효성을 확인하고 제안 기법의 우수성을 입증한다.

Keywords

Acknowledgement

This work was supported by the Academic Promotion System of Korea Polytechnic University.

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