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http://dx.doi.org/10.6109/jkiice.2019.23.10.1254

A Random Access based on Pilot-Assisted Opportunistic Transmission for Cellular IoT Networks  

Kim, Taehoon (Institute of Defense Advanced Technology Research (IDAR), Agency for Defense Development (ADD))
Chae, Seong Ho (Department of Electronics Engineering, Korea Polytechnic University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.23, no.10, 2019 , pp. 1254-1260 More about this Journal
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.
Keywords
5G cellular networks; internet-of-things; random access; pilot-assisted opportunistic transmission;
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