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GSM Call Setup.

Published byΚίρκη Κορνάρος Modified over 5 years ago

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Presentation on theme: "GSM Call Setup."— Presentation transcript:

1 GSM Call Setup

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

3 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

4 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC/ VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC/ VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

5 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC/ VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC/ VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

6 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC/ VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC/ VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

7 BSC Base 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 BSC VMS MSC EIR PrePaid SMSC IN MSC VLR BSC PSTN Fixed Network
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

9 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

10 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

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

12 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

13 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

14 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

15 PrePaid Node 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 BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

17 HLR BSC VMS Voicemail MSC EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

18 MSC HLR BSC VMS Voicemail EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

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

20 MSC HLR BSC VMS Voicemail EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

21 MSC HLR BSC VMS Voicemail EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

22 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

23 Home Location Register
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 MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

25 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

26 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

27 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

28 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

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

30 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

31 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

32 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

33 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

34 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN VLR BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET VLR BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

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

36 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

37 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

38 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

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

40 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

41 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

42 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

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

44 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

45 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

46 HLR MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International PABX B subscriber BTS

47 Base Station Controller
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 MSC BSC VMS Voicemail EIR PrePaid SMSC IN MSC BSC
A subscriber BSC BTS VMS Voic MSC EIR PrePaid SMSC IN INTERNET MSC BSC PSTN Fixed Network PSTN International 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.

51 A or B subscriber Hangs up.

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