>These are:
>* cipher mode complete (U == uplink)
>* identity request (D == downlink)
>* identity response (U)
> * tmsi reallocation command (D) / complete (U)
>* setup (D)
>* call confirmed (U)
>* assignment command (D)
>

It seems that some SYSTEM INFORMATION messages are sent
on the SACCH of the SDCCH that was allocated in the IMMEDIATE
ASSIGNMENT. They are on our candidate list and probably also
encrypted after the CIPHER MODE COMPLETE message.

reference: 
http://www2.informatik.hu-berlin.de/~goeller/isdn/DieGSMDmKanaele.pdf (page 23)
The first column in the spreadsheet is the TDMA frame number. You can see that 
the SDCCH
transfers one LAPDm frame in 51 frame ticks and the SACCH in 102 ticks.
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