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M12 Hardware Design

M12_HD_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

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 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

1 2 ... 69 70 71 72 73 74 75 76

Quectel Cellular Engine 1
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