Hi qaqa,
I personally couldn't find the formula about RACH propagation delay. Could you please include the subclause of the 3GPP TS where you found it?
Anyway, I think there's an error in the formula you propose.
I think (4+1.5)*3*78=1287m should be as a sum instead of multiplier, i.e. (4+(-)3+1.5)*78= somewhere from 195 to 663. That's because 3 IS the granularity of the measurements. This means that you cannot distinguish measurements within 3 consecutive chips.
That's just IMHO, though.
6.2.7.5 Propagation Delay [FDD]
Description: One-way radio interface delay as measured during RACH access.
Value range: {0 .. 765 chips}.
Granularity: 3 chips.
Field length: 8 bits.
^taken from 3GPP TS 25.435
'ай със здраве (regards),
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