Mobile edge computing (MEC) is expected to be an effective solution todeliver 360-degree virtual reality (VR) videos over wireless networks. Incontrast to previous computation-constrained MEC framework, which reduces thecomputation-resource consumption at the mobile VR device by increasing thecommunication-resource consumption, we develop a communications-constrained MECframework to reduce communication-resource consumption by increasing thecomputation-resource consumption and exploiting the caching resources at themobile VR device in this paper. Specifically, according to the taskmodularization, the MEC server can only deliver the components which have notbeen stored in the VR device, and then the VR device uses the receivedcomponents and the corresponding cached components to construct the task,resulting in low communication-resource consumption but high delay. The MECserver can also compute the task by itself to reduce the delay, however, itconsumes more communication-resource due to the delivery of entire task.Therefore, we then propose a task scheduling strategy to decide whichcomputation model should the MEC server operates, in order to minimize thecommunication-resource consumption under the delay constraint. Finally, wediscuss the tradeoffs between communications, computing, and caching in theproposed system.
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