[_Jim]

I'm saying that the MA grant mechanism can be distinct from the CD-based physical channel format

I think you're putting waaaay too much emphasis on these terms - practiaclly speaking it simply indicates the methodology used to attain 'separate' voice or data streams:

1. FDMA - Frequency Division Multiple Access (analog FM, uses different freq for each 'stream')
2. TDMA - Time Divsiion MA (uses same 'channel' (time shared spectrum) but different time slot for each 'stream')
3. CDMA - Code Divsion MA (uses same spectrum but different Walsh 'spreading' code for each stream)

And with that - I gotta get outa here!

[apochromat]

There's no point in having different terms mean the same thing. What you described are simply multiplex formats: frequency division multiplex (FDM), time-division multiplex (TDM) and a form of code-division multiplex (CDM) based on Walsh functions, which are but one type of spreading code.
It's possible to have a multiplex system as a set of (dedicated) multiplex channels without having a channel reservation (automatic channel re-dedication, i.e. multiple access) capability.