Quectel M12 User Manual

M12 Hardware Design
M12_Hardware_Design_V3.2 - 73 -
Appendix A: GPRS coding schemes
Four coding schemes are used in GPRS protocol. The differences between them are shown in
Table 33.
Table 33: Description of different coding schemes
Scheme
Code
Rate
USF
Pre-coded
USF
Radio
Block
excl.USF
and BCS
BCS
Tail
Coded
Bits
Punctured
Bits
Data
Rate
Kb/s
CS-1
1/2
3
3
181
40
4
456
0
9.05
CS-2
2/3
3
6
268
16
4
588
132
13.4
CS-3
3/4
3
6
312
16
4
676
220
15.6
CS-4
1
3
12
428
16
-
456
-
21.4
Radio block structure of CS-1, CS-2 and CS-3 is shown as Figure 52:
Figure 52: Radio block structure of CS-1, CS-2 and CS-3
Radio block structure of CS-4 is shown as Figure 53:
Figure 53: Radio block structure of CS-4
Rate 1/2 Convolutional Coding
Puncturing
456 bits
USF
BCS
Radio Block
Block
Code
No coding
456 bits
USF
BCS
Radio Block
Quectel
Confidential

Quectel M12 Specifications

General

Brand	Quectel
Model	M12
Category	Control Unit
Language	English