User's Manual
Table Of Contents
- Contents
- Table Index
- Figure Index
- 0. Revision history
- 1. Introduction
- 2. Product concept
- 3. Application interface
- 3.1. Pin
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charging interface
- 3.6. Power saving
- 3.7. Summary of state transitions
- 3.8. RTC backup
- 3.9. Serial interfaces
- 3.10. Audio interfaces
- 3.11. SIM card interface
- 3.12. SD card interface
- 3.13. PCM interface
- 3.14. ADC
- 3.15. Behaviors of the RI
- 3.16. Network status indication
- 3.17. Operating status indication
- 4. Antenna interface
- 5. Electrical, reliability and radio characteristics
- 6. Mechanical dimensions
- 7. Storage and manufacturing
- Appendix A: GPRS coding schemes
- Appendix B: GPRS multi-slot classes
M80 Hardware Design
M80_HD_V1.2 - 89 -
Appendix A: GPRS coding schemes
Four coding schemes are used in GPRS protocol. The differences between them are shown in
Table 38.
Table 38: 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 59:
Figure 58: Radio block structure of CS-1, CS-2 and CS-3
Radio block structure of CS-4 is shown as Figure 60:
Figure 59: Radio block structure of CS-4
Block
code
No coding
456 bits
USF
BCS
Radio Block
Rate 1/2 convolutional coding
Puncturing
456 bits
USF
BCS
Radio Block