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GSM Call Setup: Subscriber Call Flow & Network Handling

Understand how a "B" subscriber’s call is processed in a GSM network. From call request to account deduction, follow the journey. Discover the critical checkpoints like location registration and money balance confirmation in this detailed guide. Dive deep into the network's intricate path to connect a call between subscribers.

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GSM Call Setup: Subscriber Call Flow & Network Handling

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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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