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Online Task Offloading for 5G Small Cell Networks
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DOI：10.1109/TMC.2020.3036390.png)
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Small cells are deployed in 5G networks to complement the macro cells for improving coverage and capacity. Small cells and edge computing are natural partners which can improve users' experience. Small cell nodes (SCNs) equipped with edge servers can support emerging computing services, such as virtual reality which impose low-latency and precise contextual requirements. With the proliferation of wireless devices, there is an increasing demand for offloading tasks to SCNs. Given limited computation and communication resources, the fundamental problem for a small cell network is how to select computing tasks to maximize effective rewards in an uncertain and stochastic environment. To this end, we propose an online learning framework, LFSC, which has the performance guarantee to guide task offloading in a small cell network. LFSC balances between reward and constraint violations, and it consists of three subroutines: i) a randomized algorithm which calculates selection probability of each task based on task weights; ii) a greedy assignment algorithm which cooperatively allocates tasks among different SCNs based on the selection probability; iii) an update algorithm which exploits the multi-armed bandit (MAB) technique to update task weights according to the feedback. Our theoretical analysis shows that both the regret and violations metrics of LFSC have the sub-linear property. Extensive simulation studies based on real world data confirm that LFSC achieves a close-to-optimal reward with low violations, and outperforms many state-of-the-art algorithms.
Keyword:
Task analysis
5G mobile communication
Microcell networks
Servers
Probability
Collaboration
Edge computing
Task offloading
online learning
5G small cell
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