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On URLLC Downlink Transmission Modes for MEC Task Offloading
Conference presentation   Open access

On URLLC Downlink Transmission Modes for MEC Task Offloading

Jinfei Wang, Yi Ma, Na Yi and Rahim Tafazolli
IEEE Vehicular Technology Conference 2020 (Antwerp, Belgium, 25/05/2020–28/05/2020)
03/03/2020

Abstract

Multi-access edge computing (MEC) task offloading downlink aggregate encoding ultra-reliable low-latency communications (URLLC).
Multi-access edge computing for mobile computingtask offloading is driving the extreme utilization of available degrees of freedom (DoF) for ultra-reliable low-latency downlink communications. The fundamental aim of this work is to find latency-constrained transmission protocols that can achieve a very-low outage probability (e.g. 0:001%). Our investigation is mainly based upon the Polyanskiy-Poor-Verd´u formula on the finite-length coded channel capacity, which is extended from the quasi-static fading channel to the frequency selective channel. Moreover, the use of a suitable duplexing mode is also critical to the downlink reliability. Specifically, time-division duplexing (TDD) outperforms frequency-division duplexing (FDD) in terms of the frequency diversity-gain. On the other hand, FDD takes the advantage of having more temporal DoF in the downlink, which can be exchanged into the spatial diversity-gain through the use of space-time coding. Numerical study is carried out to compare the reliability between FDD and TDD under various latency constraints.
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