[morei]

This is much harder than you're assuming.

With the increasing prevalence of TLS traffic (https et al), any cache almost certainly needs to be an explicitly configured proxy which is a user configuration issue with all it's associated support and compatibility problems.

Add to that the power consumption on a satellite is often a limiting factor, the security issues, the added latency, the ever decreasing fraction of traffic that is cache-able, etc etc ... it's very much not clear that this is a good idea.

[ncmncm]

I see that you replied before reading the final paragraph.

Whatever is the power consumption of broadcasting to all receivers in the cell, it is much, much less than transmitting the same data to each of the receivers individually, and less again than receiving it over and over again from the fiber terminal, even if you have to power up an SSD for it.