Appendix B Gprs Coding Scheme - Quectel M35 User Manual

9 Appendix B GPRS Coding Sche
me
Four coding schemes are used in GPRS protocol. The differences between them are shown in the
following table.
Table 35: Description of Different Coding Schemes
Code
Scheme USF
Rate
CS-1 1/2 3
CS-2 2/3 3
CS-3 3/4 3
CS-4 1 3
Radio block structure of CS-1, CS-2 and CS-3 is shown as the figure below.
Figure 51: Radio Block Structure of CS-1, CS-2 and CS-3
M35_User_Manual
Radio Block
Pre-coded
excl.USF and
USF
BCS
3 181
6 268
6 312
12 428
Radio Block
USF
Rate 1/2 convolutional coding
Confidential / Released
BCS Tail
40 4
16 4
16 4
16 -
Puncturing
456 bits
GSM/GPRS Module Series
M35 User Manual
Coded Punctured
Bits Bits
456 0
588 132
676 220
456 -
BCS
83 / 85
Data
Rate
Kb/s
9.05
13.4
15.6
21.4