  Fog networks benefit from content caching at edge nodes (ENs) as well as
fronthaul connectivity to the cloud. In previous works, both dedicated and
multicast fronthaul links has been considered under different assumptions with
Normalized Delivery Time (NDT) as a standard to measure the performance. While
dedicated links has been studied extensively in different caching scenarios,
multicast links has been developed under assumption of 2-by-2 fog network where
cloud is connected to two ENs serving two users. The extension to arbitrary
number of ENs and users only provides the lower bound on the achievable
performance. In contrast, this letter proposes an achievable coded multicasting
scheme for a general M-by-K fog network with M ENs and K users. The optimality
of the proposed scheme is evaluated using both comparison with theoretical
lower bound as well as using numerical analysis.
