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M80 Hardware Design

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Appendix A: GPRS coding schemes

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

Table 32.

Table 32: 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

181

456

9.05

CS-2

2/3

268

588

132

13.4

CS-3

3/4

312

676

220

15.6

CS-4

428

456

21.4

Radio block structure of CS-1, CS-2 and CS-3 is shown as Figure 55:

Figure 55: Radio block structure of CS-1, CS-2 and CS-3

Radio block structure of CS-4 is shown as Figure 56:

Figure 56: 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

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