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- 2. GSM Network Architecture B T S MSCVLR HLR PSTN ISDN Data Networks ( Air interface OSS B T S B T S MSC VLR BSCBSC EIR AuC
- 4. GSM: Speech toRadio waves Speech Coding Channel Coding Interleaving Burst formatting Ciphering Burst formatting Deciphering Analog Modulation 200kHz BW Speech Decoding Analog 200kHz BW Demodulation De-interleaving Channel Decoding 4
- 5. NORMAL BURST 0 12 3 4 5 6 7 0 1 2 3 4 5 6 7 57 bits 57 bits26 bits 33 FRAME1(4.615ms) FRAME2 Training sequence Data Data Tail Bits Tail Bits Flag Bit Flag Bit Guard Period Guard Period 0.546ms 0.577ms Carries traffic channel and control channels BCCH, PCH, AGCH, SDCCH, SACCH and FACCH.
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- 7. TAX CA TAX ND GMSC MSC GMSC MSC/VLR UPW BSNLMobile moves to CA and Powers on MS CA UPW HLR HLR ND MS 9412****** CA ND ( Update Location/ Authentication ) De register Mobile to Old VLR ACK from old MSC/VLR VLR LOCATION UPDATING VLR VPLMN HPLMN Location Update ( TMSI, LAI ) LU Accept ( New TMSI) Update Location Update Location LU Accept (Subs data) LU Accept Update Location LU Accept LU Accept New VLR records subscriber data. • Listens BCCH/FCCH
- 8. MS BTS MSCBSC RIL3- CM LAPD m Layer 1 RIL3 - MM RIL3 - RR Layer 1 LAPD m LAPD Um A bis A link BCDEFG MTP SCCP BSSMAP DTAP MM TCAP DTAP CM U PSCCP M A P Layer 1Layer 1 GSM Signaling Protocols LAPD MTP I S SCCP BSSMAP BTSM RIL 3- RR BTSMRR
- 9. Architecture For MobileTerminated Call GMSC- B BSS-B MS VLR-B MSC-B VISITING PLMN A- Interface Air Interface HLR-B IAM ( ISUP )