User Manual

GSM/GPRS Module Series

GC10 Hardware Design

GC10_Hardware_Design Confidential / Released 74 / 76

Appendix B GPRS Coding Scheme

Four coding schemes are used in GPRS protocol. The differences between them are shown in the

following table:

Table 27: Description of Different Coding Schemes

Radio block structure of CS-1, CS-2 and CS-3 is shown as the figure below:

Figure 49: Radio Block Structure of CS-1, CS-2 and CS-3

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

Rate 1/2 convolutional coding

Puncturing

456 bits

USF

BCS

Radio Block