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Robust Computation Offloading in Fog Radio Access Network With Fronthaul Compression
IEEE Transactions on Wireless Communications ( IF 10.4 ) Pub Date : 2021-04-28 , DOI: 10.1109/twc.2021.3074810
Jinghong Tan , Tsung-Hui Chang , Kun Guo , Tony Q. S. Quek

Deployed with computation resources, fog radio access network (F-RAN) provides a promising solution for computation offloading. To take full advantage of two-tier computing in the F-RAN, on one hand, it is inevitable to design, between edge and cloud, an efficient and flexible fronthaul transmission strategy, and fronthaul resource allocation should be jointly optimized with allocation of tasks and other resources. On the other hand, a robust computation provisioning strategy that can avoid failures caused by estimation errors of available computation resources is necessary. In this work, considering the fronthaul compression and the uncertain computation capacity, we design an energy-efficient computation offloading mechanism in the F-RAN. The formulated problem is challenging to solve due to coupled communication and computation resource constraints and binary variables for task placement. We show that the problem can be recast as a convex problem if binary variables are relaxed. On top of this result, we propose an efficient algorithm to find a stationary solution. Through simulation, we demonstrate that the proposed algorithm outperforms the baseline algorithm significantly and converges to the near-optimal point solution. Besides, we compare the F-RAN with single-tier computing systems and show the excellence of the F-RAN in energy conservation for mobile devices.

中文翻译:

具有前传压缩的雾无线接入网络中的稳健计算卸载

使用计算资源部署的雾无线接入网络 (F-RAN) 为计算卸载提供了一种很有前景的解决方案。充分利用F-RAN中的两层计算,一方面不可避免地需要在边缘和云之间设计高效灵活的前传传输策略,前传资源分配应与任务分配联合优化和其他资源。另一方面,需要一种健壮的计算供应策略,可以避免由于可用计算资源的估计错误而导致的失败。在这项工作中,考虑到前传压缩和不确定的计算能力,我们在 F-RAN 中设计了一种节能的计算卸载机制。由于耦合的通信和计算资源限制以及用于任务放置的二进制变量,公式化的问题很难解决。我们表明,如果放松二元变量,该问题可以重铸为凸问题。在此结果之上,我们提出了一种有效的算法来寻找固定解。通过仿真,我们证明了所提出的算法明显优于基线算法,并且收敛到接近最优的点解。此外,我们将 F-RAN 与单层计算系统进行了比较,并展示了 F-RAN 在移动设备节能方面的卓越性。我们提出了一种有效的算法来寻找固定解。通过仿真,我们证明了所提出的算法明显优于基线算法,并且收敛到接近最优的点解。此外,我们将 F-RAN 与单层计算系统进行了比较,并展示了 F-RAN 在移动设备节能方面的卓越性。我们提出了一种有效的算法来寻找固定解。通过仿真,我们证明了所提出的算法明显优于基线算法,并且收敛到接近最优的点解。此外,我们将 F-RAN 与单层计算系统进行了比较,并展示了 F-RAN 在移动设备节能方面的卓越性。
更新日期:2021-04-28
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