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GSM Call Setup

GSM Call Setup. GSM Network. 'B' subscriber ANSWERS. What happens NEXT?. 'A' subscriber CALLS. GSM Call Setup. HLR. A subscriber. BSC. BTS. VMS Voicemail. MSC. EIR. PrePaid. SMSC. IN. INTERNET. MSC VLR. BSC. PSTN Fixed Network. PSTN International. PABX. B subscriber.

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GSM Call Setup

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  1. GSM Call Setup

  2. GSM Network 'B' subscriber ANSWERS What happens NEXT? 'A' subscriber CALLS GSM Call Setup

  3. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  4. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC/ VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  5. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC/ VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  6. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC/ VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  7. BSCBase Station Controller A subscriber BTS = Base Transceiver Station • The call request reaches the BSC from the BTS and is forwarded to MSC. • After call is established, the BSC will perform decoding of the call (in typical config.)

  8. HLR A subscriber BSC BTS VMS Voicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  9. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  10. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  11. Checks A number. • To whom is A subscriber calling?(Checks B number) • Example : A subscriberhas prepaid. MSC Mobile Switching Centre

  12. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  13. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  14. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  15. Does the A subscriber have money left on his/her account? • When the call is established and on-going the subscriber’s account is decremented accordingly. PrePaid Node

  16. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  17. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  18. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  19. Where is the B subscriber? • MSC interrogates in HLR.(HLR = Home Location Register) MSC Mobile Switching Centre

  20. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  21. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  22. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  23. HLR says ’I am the home of the B subscriber and I know where he/she is right now’ (i.e. which VLR) • Tells this VLR ’Give me a visitor address for this subscriber’ (MSRN) HLR Home Location Register

  24. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  25. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  26. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  27. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  28. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  29. Hosting MSC/VLR returns B subscriber’s assigned MSRN. VLR

  30. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  31. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  32. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  33. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  34. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  35. ’Thanks for the visitor address!’ • ’I will send this address to the MSC that requested for it.’ HLR Home Location Register

  36. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  37. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  38. HLR MSC A subscriber BSC BTS VMSVoicemail EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  39. ’Thank you, HLR!’ • Speech connection is set up towards the MSC/VLR where the B subscriber is residing. MSC Mobile Switching Centre

  40. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  41. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  42. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  43. Setting up a speech connection towards BSC. MSC Mobile Switching Centre

  44. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  45. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  46. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  47. BSC will now send a paging signal to all the BTSs that it covers. • Coding of speech when call is established. BSC Base Station Controller

  48. HLR A subscriber BSC BTS VMSVoicemail MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTNFixed Network PSTNInternational PABX B subscriber BTS

  49. The B subscriber has now many choices: • He/she may answer. • He/she may be busy. • The mobile (MS) may be forwarded. • The mobile may be turned off or outside coverage area. • And more... • What happens next depends on the B subscriber’s condition and what he/she chooses to do. B subscriber

  50. A or B subscriber Hangs up.

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