A New QoS-Guarantee Strategy for NOMA Assisted Semi-Grant-Free Transmission

Zhiguo Ding, Robert Schober, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

Abstract

Semi-grant-free (SGF) transmission has recently received significant attention due to its capability to accommodate massive connectivity and reduce access delay by admitting grant-free users to channels that would otherwise be solely occupied by grant-based users. In this paper, a new SGF transmission scheme that exploits the flexibility in choosing the decoding order in non-orthogonal multiple access (NOMA) is proposed. Compared to existing SGF schemes, this new scheme can ensure that admitting the grant-free users is completely transparent to the grant-based users, i.e., the grant-based users’ quality-of-service experience is guaranteed to be the same as for orthogonal multiple access. In addition, compared to existing SGF schemes, the proposed SGF scheme can significantly improve the robustness of the grant-free users’ transmissions and effectively avoid outage probability error floors. To facilitate the performance evaluation of the proposed SGF transmission scheme, an exact expression for the outage probability is obtained and an asymptotic analysis is conducted to show that the achievable multi-user diversity gain is proportional to the number of participating grant-free users. Computer simulation results demonstrate the performance of the proposed SGF transmission scheme and verify the accuracy of the developed analytical results.

Original languageEnglish (US)
JournalIEEE Transactions on Communications
DOIs
StateAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Keywords

  • Base stations
  • Interference
  • NOMA
  • Non-orthogonal multiple access
  • Power system reliability
  • Probability
  • Quality of service
  • Silicon carbide
  • machine-type communications
  • semi grant free transmission
  • successive interference cancellation (SIC) decoding order

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