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SCIENCE CHINA Information Sciences, Volume 64 , Issue 8 : 182303(2021) https://doi.org/10.1007/s11432-020-2925-1

Resource optimization in wireless powered cooperative mobile edge computing systems

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  • ReceivedJan 11, 2020
  • AcceptedMay 25, 2020
  • PublishedJul 8, 2021

Abstract


Acknowledgment

This work was supported by National Natural Science Foundation of China (Grant No. 61971092). We thank the reviewers for their detailed review and constructive comments, which have improved the quality of this paper.


References

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  • Figure 1

    (Color online) The model for the two-user WPT-MEC system.

  • Table 1  

    Table 1Time division structure of the harvest-then-offload protocol

    WPT Computation offloading
    $T~/~3$ $T~/~3$ $T~/~3$
    $\mathrm{AP}~\rightarrow~D_{1},~D_{2}$ $D_{1}~\rightarrow~D_{2}$ $D_{2}\left(D_{1},~D_{2}\right)~\rightarrow~\mathrm{AP}$
  • Table 2  

    Table 2Simulation parameters

    Parameter Value
    Carrier frequency 60 GHz
    Channel bandwidth, $W$ 500 MHz
    Block time, $T$ 10–30 s
    Distance between $D_{1}$ and $D_{2}$, $d_{12}$ 8 m
    Distance between $D_{1}$ and AP, $d_{1}$ 15 m
    Distance between $D_{2}$ and AP, $d_{2}$ 12 m
    Coefficient of chips, $k_{i}$ $10^{-28}$
    Energy conversion efficiency of $D_i$, $v_{i}$ $1.0$
    Data size for $D_{1}$, $I_{1}$ [50,500] MB
    Data size for $D_{2}$, $I_{2}$ $I_{1}~/~2$
    CPU frequency of $D_{1}$ 0.1 GHz
    CPU frequency of $D_{2}$ 0.12 GHz
    Power of white Gaussian noise at AP, $N_{0}$ $10^{-7}$ W
    Power of white Gaussian noise at $D_{2}$, $N_{2}$ $10^{-7}$ W
    Number of CPU cycles, $C_{i}$ $2000$ cycle/bit
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