Downlink MIMO-NOMA for Ultra-Reliable Low-Latency Communications

Chiyang Xiao, Jie Zeng*, Wei Ni, Xin Su, Ren Ping Liu, Tiejun Lv, Jing Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)

Abstract

With the emergence of the mission-critical Internet of Things applications, ultra-reliable low-latency communications are attracting a lot of attentions. Non-orthogonal multiple access (NOMA) with multiple-input multiple-output (MIMO) is one of the promising candidates to enhance connectivity, reliability, and latency performance of the emerging applications. In this paper, we derive a closed-form upper bound for the delay target violation probability in the downlink MIMO-NOMA, by applying stochastic network calculus to the Mellin transforms of service processes. A key contribution is that we prove that the infinite-length Mellin transforms resulting from the non-negligible interferences of NOMA are Cauchy convergent and can be asymptotically approached by a finite truncated binomial series in the closed form. By exploiting the asymptotically accurate truncated binomial series, another important contribution is that we identify the critical condition for the optimal power allocation of MIMO-NOMA to achieve consistent latency and reliability between the receivers. The condition is employed to minimize the total transmit power, given a latency and reliability requirement of the receivers. It is also used to prove that the minimal total transmit power needs to change linearly with the path losses, to maintain latency and reliability at the receivers. This enables the power allocation for mobile MIMO-NOMA receivers to be effectively tracked. The extensive simulations corroborate the accuracy and effectiveness of the proposed model and the identified critical condition.

Original languageEnglish
Article number8638930
Pages (from-to)780-794
Number of pages15
JournalIEEE Journal on Selected Areas in Communications
Volume37
Issue number4
DOIs
Publication statusPublished - Apr 2019
Externally publishedYes

Keywords

  • MIMO-NOMA
  • URLLC
  • delay violation probability
  • power allocation
  • stochastic network calculus

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Xiao, C., Zeng, J., Ni, W., Su, X., Liu, R. P., Lv, T., & Wang, J. (2019). Downlink MIMO-NOMA for Ultra-Reliable Low-Latency Communications. IEEE Journal on Selected Areas in Communications, 37(4), 780-794. Article 8638930. https://doi.org/10.1109/JSAC.2019.2898785