Any WiMAX gurus here? I am reading the standards

http://standards.ieee.org/getieee802...02.16-2004.pdf

and

http://standards.ieee.org/getieee802...2.16e-2005.pdf

and I have a couple of books and course materials from Mprirical and
Award, but I can not make sense to this:

Bandwidth requests and grants are always discussed in uplink bandwidth
context. So how does a station request for more _downlink_ bandwidth?

Yours,
Anssi Porttikivi
app@iki.fi