TOPIC: Rolling Wave Plannin vs. Iterative Schedulin w/ backlog vs. On-demand schedulin

Hi everyone,

I am having difficulty distinguishing the 3: Rolling Wave Planning, Iterative Scheduling with backlog, and On-demand scheduling.
I have read the definitions and explanations in the PMBOK, but still - I can't figure out the major difference between the 3.

Can anyone help?

This is what I deciphered in simple terms:
Rolling Wave - Work accomplished near term planned in detail, while future work is planned at a higher level
Iterative Scheduling with a backlog - Completes work on backlog? (*confused*)
On-demand Scheduling - Pulls work from backlog depending on resources available (KanBan)