Then there is the alternative system where you do not request UP or DOWN but you request the floor, otherwise known as destination dispatch <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Destination_dispatch" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Destination_dispatch</a><p>which introduces a whole new set of complexity.