Integrated Grant-Free Scheme for URLLC and mMTC

Seokjae Moon, Jang Won Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


In this paper, we study a grant-free (GF) scheme to efficiently support the IoT user equipments (UEs). Compared with the existing studies regarding the GF schemes where only one type of the IoT UEs is considered, we develop an integrated GF scheme to support both the ultra-reliable low-latency communications (URLLC) and massive machine type communications (mMTC) UEs. Specifically, the proposed integrated GF scheme provides high reliability and low latency for the URLLC UEs by adopting both the contention-based (CB) and contention-free (CF) transmissions, while also supporting the mMTC UEs by adopting the CB transmission. We evaluate the performance of the proposed integrated GF scheme with the ns-3 simulator. Simulation results show that our integrated GF scheme is able to support the both types of the UEs effectively, and especially, the URLLC UEs can achieve high success rate and low latency compared with other GF schemes.

Original languageEnglish
Title of host publication2020 IEEE 3rd 5G World Forum, 5GWF 2020 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781728172996
Publication statusPublished - 2020 Sept
Event3rd IEEE 5G World Forum, 5GWF 2020 - Virtual, Bangalore, India
Duration: 2020 Sept 102020 Sept 12

Publication series

Name2020 IEEE 3rd 5G World Forum, 5GWF 2020 - Conference Proceedings


Conference3rd IEEE 5G World Forum, 5GWF 2020
CityVirtual, Bangalore

Bibliographical note

Funding Information:
This work was supported in part by the Institute for Information and Communications Technology Promotion through the Korea Government (MSIT) (Development on the Core Technologies of Transmission, Modulation, and Coding with Low-Power and Low-Complexity for Massive Connectivity in the IoT Environment), South Korea, under Grant 2016-0-00181, and in part by the Midcareer Researcher Program through the NRF grant funded by MSIT under Grant NRF-2019R1A2C2084870.

Publisher Copyright:
© 2020 IEEE.

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Information Systems and Management
  • Safety, Risk, Reliability and Quality
  • Computer Networks and Communications


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