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On URLLC Downlink Transmission Modes for MEC Task Offloading

Wang, Jinfei, Ma, Yi, Yi, Na and Tafazolli, Rahim (2020) On URLLC Downlink Transmission Modes for MEC Task Offloading In: IEEE Vehicular Technology Conference 2020, 25-28 May 2020, Antwerp, Belgium.

Wang.J_VTC_S_2020_URLLC.pdf - Accepted version Manuscript

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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.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Date : 3 March 2020
Funders : UK 5G Innovation Centre, EU H2020 5G-DRIVE programme
Uncontrolled Keywords : Multi-access edge computing (MEC), task offloading, downlink, aggregate encoding, ultra-reliable low-latency communications (URLLC).
Depositing User : James Marshall
Date Deposited : 03 Mar 2020 11:34
Last Modified : 03 Mar 2020 11:34

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