The theoretical performance analysis results of F-RANs will be provided in this section. First, we will studied the information-theoretical performance. The conventional information-theoretical performance metrics are not applicable since they cannot capture the computation and caching capabilities of F-RANs. To solve this problem, we firstly formulate a system model to characterize the coordination of caching and computing between the cloud and fog-computing layers in F-RANs. Then, some analytical results, such as effective capacity and latency, are derived to figure out the performance limits of F-RANs and provide some insights for the system design. These research methodology analytical results can be extended into the content centric networks and mobile edge computing systems.
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