your discussion is very intersting and helful.
I have read that the minimum value for T200 regarding SDCCH should be at the reception of the 18 multli frame meaning 8*0,577*18=83 ms
Huawei default value is 60 msec meaning at the 13th frame.
Have you any explanation???
It seems that the T200 expires before the MS has the opportunity to send the ack!