ZTE Corporation ZXG-BTS2 Manuale Utente
ZXG10-BTS (V2.9) Technical Manual
36
Confidential and Proprietary Information of ZTE CORPORATION
F
I G U R E
1 5
T
I M E S L O T S I N T H E
T
I M E A N D
F
R E Q U E N C Y
D
O M A I N
Time
Fr
eq
u
en
cy
15/26ms
200kHz
Timeslot
0
1
2
3
4
5
6
7
8
TDMA Frame Structure
In the GSM system, each carrier has eight timeslots. Eight adjacent
Timeslots form a basic unit, called a TDMA frame. Several TDMA frames
form a multi-frame, as shown in Figure 16.
F
I G U R E
1 6
S
C H E M A T I C
D
I A G R A M O F T H E
F
R A M E
S
T R U C T U R E
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2046
2047
24
25
24
25
49
49
50
50
48
3
4
5
6
7
1 Hyper Frame=2048 Super Frames＝2715648
TDMA Frame
1 Super Frame= 1326 TDMA Frames
1Multiframe=26TDMA Frames=120ms
1Multiframe=51TDMA Frames=(3060/13 ms )
1TDMA Frame=8BP=120/26 ms
TCH
SACCH/T
FACCH
BCCH
CCCH
SDCCH
CCCH
SDCCH
The GSM circuit service has two kinds of multi-frames: 26-frame multi-
frame and 51-frame multi-frame.
26-frame multi-frame: It contains 26 TDMA frames, with a period 120 ms,
used for traffic channel and associated control channel.
used for traffic channel and associated control channel.
51-frame multi-frame: It contains 51 TDMA frames, with a period
3,060/13 ms (about 235ms), used for control channel.
3,060/13 ms (about 235ms), used for control channel.