An Efficient Time-Shifted Random Access Scheme for Cellular-Based IoT Networks

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Random access (RA) scheme is one of the critical issues for successfully and efficiently connecting devices in the Internet of Things (IoT) networks. In cellular-based IoT networks, Zadoff-Chu (ZC) sequences are used as preambles, where their cyclically shifted versions are orthogonal to each other. We propose a time-shifted RA scheme for cellular IoT networks to reduce collision and to accommodate more devices, which can also increase fairness. In the proposed scheme, each IoT device efficiently adjusts the amount of cyclic shift of ZC sequences during preamble generation phase. We formulate an optimization problem to minimize average collision probability and provide an algorithmic solution. Simulation reveals that our proposed scheme can achieve near-perfect fairness while effectively mitigating collision probability.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2019-03
Language
English
Article Type
Article
Citation

IEEE COMMUNICATIONS LETTERS, v.23, no.3, pp.522 - 525

ISSN
1089-7798
DOI
10.1109/LCOMM.2019.2892139
URI
http://hdl.handle.net/10203/253995
Appears in Collection
EE-Journal Papers(저널논문)
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