Multi-access edge computing for mobile computing-task 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-Verdú 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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    Title :

    On URLLC Downlink Transmission Modes for MEC Task Offloading


    Contributors:
    Wang, Jinfei (author) / Ma, Yi (author) / Yi, Na (author) / Tafazolli, Rahim (author)


    Publication date :

    2020-05-01


    Size :

    212593 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English





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