Содержание
- 2. Contents Overview Processing of Voice Signal Radio Channel
- 3. Radio Interface Another MSC HLR/AUC SMC PSTN ISDN OMC MS Um MS A-bis BSC A BTS
- 4. Communication management (CM) Radio resources management (RR) Mobility and security management (MM) Integrated management TCH0 TCH1
- 5. Radio Access Technology FDMA TDMA CDMA User User User User User User User User
- 6. Radio Access Technology FDMA TDMA CDMA User User User User User User User User
- 7. Contents Overview Processing of Voice Signal Radio Channel
- 8. Voice Signal Processing (A/D) 20 ms 22.8kbit/s 13kbit/s 8KHz,13bit 33.8kbit/s Channel coding Interleaving Encryption) Burst formatting
- 9. Analog-Digital Conversion
- 10. Speech Coding The Enhance Full Rate coding mode is called CELP (Code Excited Linear Predictive Coding)
- 11. Channel Coding 13kbit/s 260 bits(FR) 112 bits(HR) 244 bits(EFR) 12.2kbit/s 5.6kbit/s (A/D) 20 ms 8KHz,13bit Voice
- 12. 1 2 3 4 5 6 7 8 ... ... 452 453 454 455 456 B
- 13. 1 2 3 4 5 6 7 8 ... ... 452 453 454 455 456 B
- 14. Voice Burst Tail bit Tail bit Guard period Data Data Training sequence (A/D) 20 ms 22.8kbit/s
- 15. Voice Signal Processing
- 16. Transmission delay t Transmission delay t TA The mobile phone should send the signal in advance!!
- 17. Timing Advance (TA) Transmission delay t Transmission delay t TA The mobile phone should send the
- 18. Frequency Hopping Frequency f 0 Frame f 1 f 2 f 3 f 4 Time
- 19. Frequency Hopping Frequency f 0 Frame f 1 f 2 f 3 f 4 Time
- 20. Prolong battery life and reduce interference DTX DTX: Discontinuous Transmission Shut off the transmission at voice
- 21. DTX DTX: Discontinuous Transmission Shut off the transmission at voice intervals; Only transmit SID frames’ The
- 22. Power Control Prolong battery life Reduce network interference Include both uplink power control and downlink power
- 23. Contents Overview Processing of Voice Signal Radio Channel
- 24. Frequency 200kHz 15/26ms BP Slit Time Frame and Channel
- 25. Physical Channel of Logical Channel
- 26. 8bit 41 synchronous bits 36 encrypted bits 3bit 68.25bit Tail bit Tail bit Guard interval Data
- 27. 3bit 142 modulation bits 3bit 8.25bit Tail bit Tail bit Guard interval Burst 3bit 57 encrypted
- 28. Broadcast control channel (BCH) Control channel Common control channel (CCCH) Voice channel (TCH) FCCH SCH BCCH
- 29. Downlink Logical Channel
- 30. Downlink Logical Channel
- 31. Uplink Logical Channel
- 32. Uplink Logical Channel
- 33. Use of Logical Channels
- 34. 26-frame multi-frame TCH/F+FACCH/F+SACCH/F (full-rate TCH) TCH/H+FACCH/H+SACCH/H (half-rate TCH) 51-frames multi-frame FCCH+SCH+BCCH+CCCH (main BCCH) FCCH+SCH+BCCH+CCCH+SDCCH/4+SACCH/4 (combined BCCH)
- 35. Structure of Main BCCH F:FCCH; S:SCH; B:BCCH; C:CCCH; R:RACH; I:IDLE
- 36. Structure of Combined BCCH F:FCCH; S:SCH; B:BCCH; C:CCCH; D:SDCCH ;A:SACCH; R:RACH; I:IDLE
- 37. Structure of Logical Channel Combination Frame-Main SDCCH D:SDCCH; A:SACCH; I:IDLE
- 38. Structure of Logical Channel Combination Frame-TCH T:TCH;A:SACCH; I:IDLE Case of one full rate TCH Case of
- 39. 0 1 2 3 2044 2045 2046 2047 0 1 2 3 48 49 50 47
- 40. 0 1 2 3 2044 2045 2046 2047 0 1 2 3 48 49 50 47
- 41. PCH RACH AGCH Downlink CCCH Uplink CCCH How to determine the total CCCH resources of the
- 42. Summary In this course, we have learned: Processing of Voice Signal Radio Channel in Um Interface
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