Enabling Grant-Free Access with Non-orthogonal Preambles and Multi-codebook SCMA

Ameha T. Abebe, Chung G. Kang

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

Abstract

Grant-free random access is one of the key elements in the emerging mobile system in which a low-latency communication requirement must be met to support a massive number of machine-type communication (mMTC) devices. The random access success rate of sparse code multiple access (SCMA)-based grant-free (GF) access is mainly determined by factors such as collision in random access resource selection, users' activity, and data misdetection. At the same time, it is challenging to decrease the effect of these factors while reducing signaling overhead. One approach to handle the challenge is to employ a large set of non-orthogonal preambles for active user detection and channel estimation while allowing users' data to be differentiated by their channel even if the same SCMA codebook (CB) is selected. In this paper, we introduce a new approach that maps a user's consecutive symbols to code words from different SCMA CBs in around-robin manner, as opposed to conventional SCMA in which a single codebook (CB) is employed per a user's random access transmission. It is also shown that the proposed multi-codebook SCMA-based GF access scheme outperforms the conventional single-codebook SCMA-based one by overloading of more users(up to 200%) while keeping the same preamble length, i.e., the same level of overhead.

Original languageEnglish
Title of host publicationICTC 2019 - 10th International Conference on ICT Convergence
Subtitle of host publicationICT Convergence Leading the Autonomous Future
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages883-888
Number of pages6
ISBN (Electronic)9781728108926
DOIs
Publication statusPublished - 2019 Oct
Event10th International Conference on Information and Communication Technology Convergence, ICTC 2019 - Jeju Island, Korea, Republic of
Duration: 2019 Oct 162019 Oct 18

Publication series

NameICTC 2019 - 10th International Conference on ICT Convergence: ICT Convergence Leading the Autonomous Future

Conference

Conference10th International Conference on Information and Communication Technology Convergence, ICTC 2019
CountryKorea, Republic of
CityJeju Island
Period19/10/1619/10/18

Keywords

  • Grant-free access
  • Non-orthogonal preambles
  • SCMA
  • Zadoff-chu sequence

ASJC Scopus subject areas

  • Artificial Intelligence
  • Computer Networks and Communications
  • Computer Science Applications
  • Information Systems and Management
  • Management of Technology and Innovation
  • Safety, Risk, Reliability and Quality
  • Media Technology
  • Control and Optimization

Fingerprint Dive into the research topics of 'Enabling Grant-Free Access with Non-orthogonal Preambles and Multi-codebook SCMA'. Together they form a unique fingerprint.

  • Cite this

    Abebe, A. T., & Kang, C. G. (2019). Enabling Grant-Free Access with Non-orthogonal Preambles and Multi-codebook SCMA. In ICTC 2019 - 10th International Conference on ICT Convergence: ICT Convergence Leading the Autonomous Future (pp. 883-888). [8939908] (ICTC 2019 - 10th International Conference on ICT Convergence: ICT Convergence Leading the Autonomous Future). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICTC46691.2019.8939908