  The deployment of low earth orbit (LEO) satellites with terrestrial networks
can potentially increase the efficiency and reduce the cost of relaying content
from a data center to a set of edge caches hosted by 6G and beyond enabled
macro base stations. In this work, the characteristics of the communication
system and the mobility of LEO satellites are thoroughly discussed to describe
the channel characteristics of LEO satellites, in terms of their frequency
bands, latency, Doppler shifts, fading effects, and satellite access. Three
different scenarios are proposed for the relay of data from data centers to
edge caches via LEO satellites, which are the "Immediate Forward", "Relay and
Forward", and "Store and Forward" scenarios. A comparative problem formulation
is utilized to obtain numerical results from simulations to demonstrate the
effectiveness and validity as well as the trade-offs of the proposed system
model. The simulation results indicate that the integration of LEO satellites
in edge caching for 6G and beyond networks decreased the required transmission
power for relaying the data from the data center to the edge caches. Future
research directions based on the proposed model are discussed.
