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GSM frames and bursts

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I am studying the GSM system and get confuse with bursts and frames.
Could anyone please kindly help. Thanks!

I read from some books and materials:

Eight bursts or TSs, numbered from 0 through 7, form a TDMA frame.
TDMA frames are numbered from 0 to 2715647.

There are superframe last for 6s 120ms,
formed either by 51-multiframe or 26-multiframe.


And as I read about the logical channel:

The downlink direction of TS 0 of the BCCH-TRX is used by
various channels...
This multiple use is possible because the logical channels can time-share TS 0 by using different TDMA frames.


I get confuse that about that.. in my understanding,

51-multiframe and 26-multiframe could only be interlaced at superframe level, i.e. per 6s 120ms

So that the timeslots 0 to 7 are occupted by one TDMA frame for either 51-multiframe or 26-multiframe

However, it's not the case for the actual implementation.

As reading about the logical channel, the formation of a Control Channel , say, TS0 is just sharing of one timeslot in a TDMA frame, i.e. 1/8 of a TDMA frame.

Can anyone comment on this? Thanks!
 

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