Thomas Kunz
Systems and Computer Engineering
37
GSM: Full Rate TCH/SACCH
–Time slot Number (TN)
equals burst number modulus 8, and identifies a particular
channel
–cycles every 26 TDMA frames (120 ms, defined so
as to be ISDN compatible)
–uplink transmission
delayed by 3 burst periods from downlink transmission
0
7
1
2
3
4
5
6
0 1 2
11 12 13
24 25
TDMA frame = 1 every 8 bursts
15/26 ms X 8 = 60/13 ms
26-multiframe = 26 TDMA frames
60/13 ms X 26 = 120 ms