Opportunistic Spectrum Sharing for D2D-Based URLLC

Zheng Chu, Wenjuan Yu, Pei Xiao, Fuhui Zhou, Naofal Al-Dhahir, Atta Ul Quddus, Rahim Tafazolli

Research output: Journal PublicationArticlepeer-review

15 Citations (Scopus)


A device-to-device (D2D) ultra-reliable low latency communications network is investigated in this paper. Specifically, a D2D transmitter opportunistically accesses the radio resource provided by a cellular network and directly transmits short packets to its destination. A novel performance metric is adopted for finite block-length code. We quantify the maximum achievable rate for the D2D network, subject to a probabilistic interference power constraint based on imperfect channel state information. First, we perform a convexity analysis that reveals that the finite block-length rate for the D2D pair in short-packet transmission is not always concave. To address this issue, we propose two effective resource allocation schemes using the successive convex approximation based iterative algorithm. To gain more insights, we exploit the monotonicity of the average finite block-length rate. By capitalizing on this property, an optimal power control policy is proposed, followed by closed-form expressions and approximations for the optimal average power and the maximum achievable average rate in the finite block-length regime. Numerical results are provided to confirm the effectiveness of the proposed resource allocation schemes and validate the accuracy of the derived theoretical results.

Original languageEnglish
Article number8778804
Pages (from-to)8995-9006
Number of pages12
JournalIEEE Transactions on Vehicular Technology
Issue number9
Publication statusPublished - Sept 2019
Externally publishedYes


  • Finite block-length codes
  • average achievable rate
  • optimal power allocation
  • performance analysis

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Automotive Engineering


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