Performance evaluation of Ultra-Reliable Low-Latency Communication over unlicensed spectrum

Abstract : We consider in this paper the transport of Ultra-Reliable Low-Latency Communication (URLLC) uplink traffic over unlicensed spectrum. We specifically consider Licensed Assisted Access (LAA) system and study the feasibility of the strict reliability and delay requirements by the means of an exact formulation which incorporates the use of a timer tracking the lifetime of each packet and identifying delay budget violation. When the delay constraint is too tight, unlicensed spectrum alone is not sufficient when the traffic density is high and we propose the use of 5G licensed spectrum to compensate for the lacking resources. We incorporate this usage of licensed spectrum for delayed packets in the model and show how to calculate the performances for a given amount of additional 5G resources for a grant-free or a grant-based allocation. We validate our analytical models numerically and dimension the joint licensed/unlicensed system resources so as to meet both reliability and delay constraints
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Submitted on : Thursday, May 2, 2019 - 12:20:05 AM
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Ayat Hindi, Salah Eddine Elayoubi, Tijani Chahed. Performance evaluation of Ultra-Reliable Low-Latency Communication over unlicensed spectrum. ICC 2019: 53rd International Conference on Communications, May 2019, Shanghai, China. pp.1-7, ⟨10.1109/ICC.2019.8761456⟩. ⟨hal-02117089⟩

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