Gsm architecture and call flow
Download as PPTX, PDF13 likes13,747 views
This document summarizes GSM architecture and call flows, including inter-MSC and intra-MSC call flows. Inter-MSC call flow occurs between two different MSCs, while intra-MSC call flow is between two BSCs within the same MSC. The inter-MSC call flow involves signaling between the BSC, MSC-O, MSC-T, HLR, and RNC to set up and release the call bearers. The intra-MSC call flow involves signaling between the MS-O, BSC-O, MSC/VLR, MGW, HLR, BSC-T, and MS-T to authenticate, set up, and release call bearers within a single MSC
Gsm architecture and call flow
- 1. GSM Architecture and Call Flow Presented by Mohd Nazir Shakeel
- 3. Call Flow in Core Network Inter MSC Call Flow Intra MSC Call Flow Inter:- Between two different MSC. Intra:- Between two BSC within same MSC.
- 4. Inter MSC call BSC MSC-O MSC-T HLR RNC During The Call Sign ResponseBearer Establishment on the Caller side 1. IAM 2. SAM PAGING Bearer Establishment on the Callee side Alerting3. ACMAlerting Connect 4. ANM Connect Connect Ack Connect Ack Disconnect 5. REL 6. RLC Bearer Release on the Caller side Bearer Release on the Caller side
- 5. Intra MSC Call Flow MS-O BSC-O MSC/VLR MGW HLR BSC-T MS-T 1. CM service request 2. Auth. & security 3. CM service accept 4. Call proceeding 5. Routing info req 6. Provide roam no 7. Provide roam no rsp 8. Routing info conf 9. Paging 10. Bearer establishment on the caller Side 11. Paging response 12.Authentication and security
- 6. Cont. MS-O BSC-O MSC/VLR MGW HLR BSC-T MS-T 24. During the Call 13. Setup 14. Call Confirmed 15. Bearer establishment on callee side 16. AlertingAlerting 17. MOD REQ 18. MOD REPLY 19. Connect 20. MOD REQ 21. MOD REPLY 22. Connect 23. Connect Ack 23. Connect Ack 25. Bearer release on the caller side 25. Bearer release on the callee side