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Optimal preemptive retransmission strategy for URLLC in unlicensed spectrum

Abstract : In this paper, we exploit the use of unlicensed spectrum in industrial scenarios for UltraReliable Low-Latency Communication (URLLC). We consider a set of automated machines communicating with a central base station and competing to the radio resources among themselves and with enhanced Mobile Broadband (eMBB) traffic. Observing the impact of Listen-Before-Talk (LBT) on the stringent reliability and delay requirements, we propose a progressive bilevel power transmission policy for URLLC, where a high power transmission can be regarded as a preemption of eMBB packets with lower power. We formulate the objective as a stochastic optimization problem under constraints and solve it in the simple Aloha-like case, and in the more complex LBT case. We then use this model to build an online (re-)transmission algorithm which enables the URLLC stations to determine in a distributed manner the optimal policy using observations of the environment parameters.
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https://hal.archives-ouvertes.fr/hal-03122154
Contributor : Tijani Chahed <>
Submitted on : Tuesday, January 26, 2021 - 7:51:12 PM
Last modification on : Tuesday, July 20, 2021 - 3:03:27 AM

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Ayat Zaki Hindi, Salah Eddine Elayoubi, Tijani Chahed. Optimal preemptive retransmission strategy for URLLC in unlicensed spectrum. IWCMC 2020: 16th International Wireless Communications and Mobile Computing, Dec 2020, Taipei, Taiwan. pp.1-6, ⟨10.1109/GLOBECOM42002.2020.9322219⟩. ⟨hal-03122154⟩

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