GSM基本呼叫处理流程

Network Solution - 3
LM Call OM Description
NIN
BSC
LMBID
MSC/VLR
IAI
Leabharlann Baidu
Paging CR(Paging Reps) CC AUTH REQUEST AUTH RESPONSE
PAGING PAGING SUCC
CIPHER MOD CMD CIPHER MOD COMP
HLR 1 2 3 4 5 6 BSC 7 8 9 10 13
MSC
VLR
11 12 14 GMSC
11 12 14 PSTN
15
16 Signal link Trunk link
Network Solution - 5
ML Call Description
1. BSC sends CM service request to MSC (SCCP - CR) 2. MSC sends back CC to BSC. MSC sends access request to VLR. 3. VLR sends Authentication to MSC, MSC sends Authentication request to MS. 4. MS sends Authentication response to MSC, MSC send Authentication ACK to VLR. 5. VLR sends Set_Ciphering_Mode to MSC. MSC sends Cipher Mod CMD to BSC. 6. BSC sends Cipher Mod COM to MSC, MSC sends access request ack to VLR. 7. MS sends Set Up to MSC. 8. MSC sends Call Proceeding to MS. 9. MSC sends Assign Request to BSC. 10. BSC sends Assign Complete to MSC. 11. MSC sends IAI to GMSC, PSTN, other MSC. 12. PSTN, other MSC sends back ACM. 13. MSC sends Alerting to MS. 14. The Called Party answered, send back ANC. 15. MSC sends Connect to MS. 16. MS sends back Connect Ack to MSC.
Network Solution - 7
ML Call OM Description
BSC CR(CM SERV REQ) CC AUTH REQUEST AUTH RESPONSE CIPHER MOD CMD CIPHER MOD COMP SET-UP CALL PROCEEDING ASSIGN REQUEST ASSIGN COMPLETE MSC/VLR
GSM Basic Call Process Performance Analysis
Land to Mobile Call Follow
HLR 7 8 4 9 10 11 BSC 12 13 14 15 16 17
MSC
VLR
3 5
2
6 18 20
GMSC
1 18 20
PSTN
19
Signal link
Network Solution - 6
ML Call A interface Message Sequence
Message sequence: 11:17.083 MSU nSCCP 3410h 35EAh 7 CR BSSAP 35EAh BSSAP Complete Layer 3 Information CELL ID 460 00 37268 18082 CM service_request TMSI 0F724834 11:17.122 MSU nSCCP 35EAh 3410h 7 CC 11:17.125 MSU nSCCP 35EAh 3410h 7 DT1 CM service_accept 11:17.547 MSU nSCCP 3410h 35EAh 7 DT1 Setup CLD P NUMB 029998 11:17.589 MSU nSCCP 35EAh 3410h 7 DT1 Call proceeding 11:17.599 MSU nSCCP 35EAh 3410h 7 DT1 Assignment Request 11:18.741 MSU nSCCP 3410h 35EAh 7 DT1 Assignment Complete Normal release CELL ID 460 00 37268 18082 11:19.645 MSU nSCCP 35EAh 3410h 7 DT1 Alerting 11:19.784 MSU nSCCP 35EAh 3410h 7 DT1 Connect 11:20.077 MSU nSCCP 3410h 35EAh 7 DT1 Connect acknowledge 11:39.606 MSU nSCCP 35EAh 3410h 7 DT1 Disconnect normal call clearing 11:39.851 MSU nSCCP 3410h 35EAh 7 DT1 Release normal call clearing 11:39.868 MSU nSCCP 35EAh 3410h 7 DT1 Release complete 11:39.872 MSU nSCCP 35EAh 3410h 7 DT1 Clear Command Call control 11:39.881 MSU nSCCP 3410h 35EAh 7 DT1 Clear Complete 11:39.898 MSU nSCCP 35EAh 3410h 7 RLSD 11:39.905 MSU nSCCP 3410h 35EAh 7 RLC
SET-UP CALL CONF ASSIGN REQUEST ASSIGN COMPLETE CC ALERTING
MT_TPHNY
LMSUCC/ MMSUCC
ACM
CONNECT CONNECT ACK
ANC
LMESTAB/ MMESTAB
Network Solution - 4
Mobile to Land Call follow
Trunk link
Network Solution - 1
LM Call Description
1. PSTN originates call to GMSC with IAI ( called number MSISDN). 2. GMSC sends SRI message (Send Routing Information) to HLR, HLR verifies whether the call is allowed. 3. HLR sends PRN message(Provide Roaming Number) to VLR according to VLR location. 4. VLR verifies MS status, assign MSRN and send back to HLR in the message PRN ACK. 5. HLR sends MSRN back to GMSC in the message SRI ACK. 6. GMSC routes the call the MSC/VLR with IAI ( called number MSRN) 7. MSC get TMSI/IMSI, LAC sends Paging request to BSS. 8. MS receives Paging message and send Paging Response back. 9. MSC sends AUTHENTICATE REQUEST to MS. 10. MS sends AUTHENTICATE RESPONSE to VLR. 11. MSC sends CIPHER MOD CMD to MS. 12. MS sends CIPHER MOD COM to MSC. 13. MSC sends Set Up to MS. 14. MS sends Call Confirm to MSC. 15. MSC sends Assignment Request to BSC. 16. BSC sends Assignment Complete to MSC. 17. Handset ringring, MS sends Alerting message to MSC. 18. MSC sends ACM message to GMSC, PSTN. 19. Handset answer the call, MS sends Connect message to MSC. 20. MSC send to ANC message to GMSC, PSTN.
Network Solution - 2
LM Call A interface Message Sequence
Message sequence: 10:49.315 MSU nSCCP 3410h 35EAh 2 CR BSSAP 35EAh BSSAP Complete Layer 3 Information CELL ID 460 00 37268 18481 Paging response TMSI 0F720245 10:49.342 MSU nSCCP 35EAh 3410h 4 CC 10:49.347 MSU nSCCP 35EAh 3410h 4 DT1 Setup CLG P NUMB 13991848088F 10:49.777 MSU nSCCP 3410h 35EAh 2 DT1 Call confirmed 10:49.798 MSU nSCCP 35EAh 3410h 4 DT1 Assignment Request 10:50.658 MSU nSCCP 3410h 35EAh 2 DT1 Assignment Complete Normal release CELL ID 460 00 37268 18481 10:50.792 MSU nSCCP 3410h 35EAh 2 DT1 Alerting 10:56.406 MSU nSCCP 3410h 35EAh 2 DT1 Connect 10:56.442 MSU nSCCP 35EAh 3410h 4 DT1 Connect acknowledge 11:37.693 MSU nSCCP 35EAh 3410h 4 DT1 Disconnect normal call clearing 11:37.894 MSU nSCCP 3410h 35EAh 2 DT1 Release normal call clearing 11:37.910 MSU nSCCP 35EAh 3410h 4 DT1 Release complete 11:37.913 MSU nSCCP 35EAh 3410h 4 DT1 Clear Command Call control 11:37.924 MSU nSCCP 3410h 35EAh 2 DT1 Clear Complete 11:37.941 MSU nSCCP 35EAh 3410h 4 RLSD 11:37.949 MSU nSCCP 3410h 35EAh 2 RLC
NIN
MLBID/ MMBID
MLSUCC
ALERTING CONNECT CONNECT ACK
IAM ACM ANC
MLESTAB
Network Solution - 8
LL Call OM Description