M900/M1800 GSM System Lecturer: Wang Hui OMA000003 GSM Communication Flow
Handover Sequence SMS Sequence Location Update Sequence GSM Basic Call Sequence CONTENT GSM Security Management
GSM Security Management Authentication and Ciphering Sequence TMSI  Reallocation Equipment Identification
Authentication Authentication may be executed during setup, location updating and supplementary services
Authentication Sequence KI ( M) KI ( N) IMSI(m) RAND GENERATOR A8  A3 KI(IMSI) IMSIBUFFER RAND RAND RAND RAND KC 1 2 5 KC ...
Authentication and Ciphering Sequence HLR MS BSS MSC VLR 1  Pre-send Triples to VLR
HLR MS BSS MSC VLR RAND RAND < SDCCH> Authentication and Ciphering Sequence 1  Pre-send Triples to VLR 2  Authenticate Aut...
HLR MS BSS MSC VLR RAND RAND < SDCCH> < SDCCH> ( SRES) Authentication and Ciphering Sequence 1  Pre-send Triples to VLR 2 ...
HLR MS BSS MSC VLR RAND RAND < SDCCH> < SDCCH> ( SRES) Authentication and Ciphering Sequence 1  Pre-send Triples to VLR 2 ...
HLR MS BSS MSC VLR 5  Cipher Mode Command Cipher Mode Complete < SDCCH> < SDCCH> 1  Pre-send Triples to VLR 2  Authenticat...
TMSI Reallocation MS VLR Location Update Req  Location Update Acc  TMSI Reallocation Comp (TMSI)
Equipment Identification MS BSS MSC VLR HLR PSTN 1 Equipment ID Request < SDCCH> EIR
MS BSS MSC VLR HLR PSTN 1 Equipment ID Request < SDCCH> 2  ID Response < SDCCH> IMEI) EIR Equipment Identification
MS BSS MSC VLR HLR PSTN 1 Equipment ID Request < SDCCH> 2  ID Response < SDCCH> IMEI) 3  Check IMEI Check IMEI Response EI...
GSM Basic Call Sequence Mobile to Land Sequence Land to Mobile Sequence Mobile Initiated Call  Clearing Sequence
GSM Basic Call Sequence The process for calling MS and called MS are two independent flow. The calling party begins with c...
Mobile to Land Sequence MS BSS MSC VLR HLR 1  CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED PSTN
MS BSS MSC VLR HLR 1  CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FOR SERVICE ...
MS BSS MSC VLR HLR 1  CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FOR SERVICE ...
MS BSS MSC VLR HLR 1  CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FOR SERVICE ...
MS BSS MSC VLR HLR 1  CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FOR SERVICE ...
MS BSS MSC VLR HLR 1  CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FOR SERVICE ...
Mobile to Land Sequence 7  ASSIG. COMMAND < SDCCH> ASSIG. COMPLETE circuit < FACCH> MS BSS MSC VLR HLR PSTN
7  ASSIG. COMMAND < SDCCH> ASSIG. COMPLETE Address Complete(ACM) Alerting  circuit < FACCH> Initial and Final Address  8  ...
7  ASSIG. COMMAND < SDCCH> ASSIG. COMPLETE Address Complete(ACM) Alerting  < FACCH> 9  Answer (ANS)Connect circuit < FACCH...
7  ASSIG. COMMAND < SDCCH> ASSIG. COMPLETE Address Complete(ACM) Alerting  < FACCH> 9  Answer (ANS)Connect 10  Connect Ack...
Question What happens when the calling MS activates the SS of BAOC?
Answer MS BSS MSC VLR HLR 1  CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FOR S...
GSM Basic Call Sequence For the called party, the flow for the called party begins when MSC sends paging command to the ca...
Land to Mobile Sequence MS BSS MSC VLR HLR GMSC ( MSISDN) Initial and Final 1  Address Message PSTN
MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) Initial and Final 1  Address Message PSTN 2  Send Routing Info Land to...
MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) ( MSRN) Initial and Final 1  Address Message PSTN ( MSRN) ( MSRN) 2  S...
MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) ( MSRN) ( MSRN) Initial and Final 1  Address Message PSTN ( MSRN) ( MS...
MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) ( MSRN) ( MSRN) ( LAI & TMSI) ( TMSI) ( TMSI) Initial and Final 1  Add...
6  Channel Request DCCH Assign Signaling Link  Established Page Response *Authentication <RACH> <AGCH> <SDCCH> <SDCCH> (TM...
6  Channel Request DCCH Assign Signaling Link  Established Page Response *Authentication 7  Complete Call Setup <RACH> <AG...
6  Channel Request DCCH Assign Signaling Link  Established Page Response *Authentication 7  Complete Call Setup 8  Call Co...
( channel) ( circuit) < FACCH> 9  Assignment Command Assignment  Complete Alert < TCH> Address Complete Land to Mobile Seq...
< FACCH> ( channel) ( circuit) < FACCH> 9  Assignment Command Assignment  Complete Alert < TCH> < FACCH> 10  Connect Conne...
Questions Please give the sequence: 1.The called MS is powered off. 2.The called MS activates the CFU to a PSTN No. 3.The ...
1.  The called MS is powered off MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) Initial and Final 1  Address Message ...
2.  The called MS activates the CFU to a PSTN No. (MSISDN) (MSISDN) CFN 4  IFAM Answers MS BSS MSC VLR HLR GMSC PSTN Initi...
Answers 3.  The called MS has been barred all incoming call. Call Barred MS BSS MSC VLR HLR GMSC (MSISDN) (MSISDN) Initial...
Answers 4.  The Called MS are not known at HLR Unknown Subscriber MS BSS MSC VLR HLR GMSC (MSISDN) (MSISDN) Initial and Fi...
MS BSS MSC VLR HLR < FACCH> < FACCH> 1  Disconnect PSTN PSTN Release Mobile Release Mobile Initiated Call Clearing Sequence
MS BSS MSC VLR HLR < FACCH> < FACCH> < FACCH> 1  Disconnect PSTN PSTN Release Mobile Release 2  PSTN Release  Complete Mob...
MS BSS MSC VLR HLR < FACCH> < FACCH> < FACCH> < FACCH> 1  Disconnect PSTN PSTN Release Mobile Release 2  PSTN Release  Com...
Mobile Initiated Call Clearing Sequence < FACCH> <FACCH> 4  DISC UA Clear Complete MS BSS MSC VLR HLR PSTN
Mobile Initiated Call Clearing Sequence < FACCH> <FACCH> 4  DISC UA Clear Complete 5  RLSD Release Complete MS BSS MSC VLR...
Brief Introduction to Location Update  Location Update Sequence Several Typical Location Update Sequences
The types of Location Update : Brief  Introdution to Location Update   Periodic Location Update IMSI Attach/Detach Normal ...
Several Typical Location Update Sequences Intra-VLR Location Update Sequence Inter-VLR Location Update Sequence
Intra-VLR Location Update  Sequence MS BSS MSC VLR <RACH> 1  Channel Request <AGCH> DCCH Assign HLR Only sent to HLR if th...
Intra-VLR Location Update  Sequence MS BSS MSC VLR <RACH> 1  Channel Request <AGCH> DCCH Assign 2  Location Update Request...
Intra-VLR Location Update  Sequence MS BSS MSC VLR <RACH> 1  Channel Request <AGCH> DCCH Assign 2  Location Update Request...
Intra-VLR Location Update  Sequence MS BSS MSC VLR <RACH> 1  Channel Request <AGCH> DCCH Assign 2  Location Update Request...
Intra-VLR Location Update  Sequence MS BSS MSC VLR <RACH> 1  Channel Request <AGCH> DCCH Assign 2  Location Update Request...
Intra-VLR Location Update  Sequence MS BSS MSC VLR <RACH> 1  Channel Request <AGCH> DCCH Assign 2  Location Update Request...
Location Update via IMSI Location Update via TMSI Inter-VLR Location Update Sequence
< RACH> 1  Channel Request < AGCH> DCCH Assign MS BSS MSC VLRn HLR VLRo Inter-VLR Location Update Via IMSI
< RACH> 1  Channel Request < AGCH> DCCH Assign 2  Location Update Request < SDCCH> MS BSS MSC VLRn HLR VLRo Inter-VLR Loca...
< RACH> 1  Channel Request < AGCH> DCCH Assign 2  Location Update Request < SDCCH> LAI & IMSI Authentication & Ciphering M...
< RACH> 1  Channel Request < AGCH> DCCH Assign 2  Location Update Request < SDCCH> LAI & IMSI Authentication & Ciphering M...
< RACH> 1  Channel Request < AGCH> DCCH Assign 2  Location Update Request < SDCCH> LAI & IMSI Authentication & Ciphering M...
6  Forward New TMSI Location Update Accept TMSI Reallocate Complete  TMSI ACK Inter-VLR Location Update Via IMSI MS BSS MS...
6  Forward New TMSI Location Update Accept TMSI Reallocate Complete  TMSI ACK 7  Clear Command Clear Complete Inter-VLR Lo...
< RACH> 1  Channel Request < AGCH> DCCH Assign MS BSS MSC VLRn HLR VLRo Inter-VLR Location Update Via TMSI
< RACH> 1  Channel Request < AGCH> DCCH Assign 2  Location Update Request < SDCCH> MS BSS MSC VLRn HLR VLRo Inter-VLR Loca...
< RACH> 1  Channel Request < AGCH> DCCH Assign 2  Location Update Request < SDCCH> LAI & TMSI MS BSS MSC VLRn HLR VLRo . I...
< RACH> 1  Channel Request < AGCH> DCCH Assign 2  Location Update Request < SDCCH> LAI & TMSI MS BSS MSC VLRn HLR VLRo Int...
Inter-VLR Location Update Via TMSI MS BSS MSC VLRn HLR VLRo 5  Cancellocation Cancellocation Ack .
Inter-VLR Location Update Via TMSI 6  Forward New TMSI Location Update Accept TMSI Reallocate Complete  TMSI ACK MS BSS MS...
Inter-VLR Location Update Via TMSI 6  Forward New TMSI Location Update Accept TMSI Reallocate Complete  TMSI ACK 7  Clear ...
The mobile  originated short message transfer procedure is separated from  mobile terminated.  The basic short message seq...
MS BSS MSC VLR Interworking MSC 1  CHANNEL REQUEST <RACH> <AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED SC MO SMS Transfer
MS BSS MSC VLR Interworking MSC 1  CHANNEL REQUEST <RACH> <AGCH> DCCH ASSIGN <SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FO...
MS BSS MSC VLR Interworking MSC 1  CHANNEL REQUEST <RACH> <AGCH> DCCH ASSIGN <SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FO...
MS BSS MSC VLR Interworking MSC 1  CHANNEL REQUEST <RACH> <AGCH> DCCH ASSIGN <SDCCH> SIGNALING LINK ESTABLISHED 2  REQ. FO...
5  MO_Forward_SM Short_Message MO_Forward_SM_Ack Short_Message_Ack (SC_No.) MO SMS Transfer MS BSS MSC VLR Interworking MS...
5  MO_Forward_SM Short_Message MO_Forward_SM_Ack Short_Message_Ack 6  RP_ACK (SC_No.) MO SMS Transfer MS BSS MSC VLR Inter...
MT SMS Transfer For Forwarding a Short Message For Forwarding Several Short Message
MS Servicing MSC VLR HLR Gateway MSC SC 1  Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT SMS Transfer (A Message)
MS Servicing MSC VLR HLR Gateway MSC SC 1  Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM 2  SIF_MT_SMS Page Page M...
MS Servicing MSC VLR HLR Gateway MSC SC 1  Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM 2  SIF_MT_SMS Page Page 3...
MS Servicing MSC VLR HLR Gateway MSC SC 1  Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM 2  SIF_MT_SMS Page Page R...
MS Servicing MSC VLR HLR Gateway MSC SC 1  Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT SMS Transfer (Several ...
MS Servicing MSC VLR HLR Gateway MSC SC 1  Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT SMS Transfer (Several ...
MS Servicing MSC VLR HLR Gateway MSC SC 1  Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT SMS Transfer (Several ...
MS Servicing MSC VLR HLR Gateway MSC SC 4  Short_Message Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack MT SMS Tran...
MS Servicing MSC VLR HLR Gateway MSC SC 4  Short_Message Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack MT SMS Tran...
What is the sequence when the originating subscriber sets the wrong SC No. in the mobile station. Question
MO_Forward_SM Short_Message MO_Forward_SM_Ack Short_Message_Ack RP_ACK (SC_No.) MS BSS MSC VLR Interworking MSC SC &quot;S...
Handover Sequence Inter - BSS  handover sequence Inter - MSC  handover sequence
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> Inter - BSS Handover  Sequence
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> 2  Handover  required Inter - BSS Handover  Sequence
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> 2  Handover  required 3  Handover Request TMSI cct. code Inter - ...
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> 2  Handover  required 3  Handover Request 4  Handover REQ ACK TMS...
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> 2  Handover  required 3  Handover Request 5  Handover Command  4 ...
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> 2  Handover  required 3  Handover Request 5  Handover Command  4 ...
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> 2  Handover  required 3  Handover Request 5  Handover Command  4 ...
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> 2  Handover  required 3  Handover Request 5  Handover Command  4 ...
MS oBSS nBSS MSC 1  Periodic Measurement reports <SACCH> 2  Handover  required 3  Handover Request 5  Handover Command  4 ...
Inter - MSC Handover Sequence  Basic Inter-MSC handover  Subsequent Inter - MSC  handover
MSCA MSCB VLRB 1  PrepareHandover 2  Allocate HandoverNo.  4  PrepareHandover_Ack 5  Send HO Report_Ack 6  Initial Address...
MSCA MSCB VLRB 1  PrepareHandover 2  Allocate HandoverNo.  4  PrepareHandover_Ack 5  Send HO Report_Ack 6  Initial  Addres...
MSCA MSCB VLRB 1  PrepareHandover 2  Allocate HandoverNo.  4  PrepareHandover_Ack 5  Send HO Report_Ack 6  Initial  Addres...
MSCA MSCB VLRB 1  PrepareHandover 2  Allocate HandoverNo.  4  PrepareHandover_Ack 5  Send HO Report_Ack 6  Initial Address...
MSCA MSCB VLRB 1  PrepareHandover 2  Allocate HandoverNo.  4  PrepareHandover_Ack 5  Send HO Report_Ack 6  Initial  Addres...
MSCA MSCB VLRB 1  PrepareHandover 2  Allocate HandoverNo.  4  PrepareHandover_Ack 5  Send HO Report_Ack 6  Initial  Addres...
MSC/VLRA MSC/VLRB 7  Process Access Signal Send End Signal Forward Access Signal Process Access Signal 8  Clear Forward Re...
MSC/VLRA MSC/VLRB 7  Process Access Signal Send End Signal Forward Access Signal Process Access Signal 8  Release Release ...
MSC/VLRA MSC/VLRB HLRA 9  SendAuth. Info Auth  Info Update Location InsertSubs.Data InsertSubs.Data_Ack UpdateLocation_Ack...
MSC/VLRA MSC/VLRB HLRA 1  PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2  Initial and Final A...
MSC/VLRA MSC/VLRB HLRA 1  PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2  Initial and Final A...
MSC/VLRA MSC/VLRB HLRA 1  PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2  Initial and Final A...
MSC/VLRA MSC/VLRB MSC/VLRC Subsequent Inter-MSC handover ForwardAccessSignal 4 ProcessAccessSignal 7  Location Update Send...
MSC/VLRA MSC/VLRB MSC/VLRC Subsequent Inter-MSC handover 5  RLS RLC 7  Location Update SendEndSignal_Ack 6  SendEndSignal ...
MSC/VLRA MSC/VLRB MSC/VLRC 7  Location Update SendEndSignal_Ack 6  SendEndSignal Subsequent Inter-MSC handover 4  ForwardA...
MSC/VLRA MSC/VLRB MSC/VLRC 4  ForwardAccessSignal ProcessAccessSignal 5  RLS RLC 7  Location Update SendEndSignal_Ack 6  S...
Summary 1. GSM Security Mangement 2. GSM Basic Call Sequence 3. Location UpdateSequence 4. SMS Sequence 5. HandoverSequence
 
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Call flow oma000003 gsm communication flow

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Call flow oma000003 gsm communication flow

  1. 1. M900/M1800 GSM System Lecturer: Wang Hui OMA000003 GSM Communication Flow
  2. 2. Handover Sequence SMS Sequence Location Update Sequence GSM Basic Call Sequence CONTENT GSM Security Management
  3. 3. GSM Security Management Authentication and Ciphering Sequence TMSI Reallocation Equipment Identification
  4. 4. Authentication Authentication may be executed during setup, location updating and supplementary services
  5. 5. Authentication Sequence KI ( M) KI ( N) IMSI(m) RAND GENERATOR A8 A3 KI(IMSI) IMSIBUFFER RAND RAND RAND RAND KC 1 2 5 KC KC KC SRES SRES SRES SRES TEMP DATA AUC HLR/AUC HLR AUTH REQ RAND KC SRES RAND A8 A3 SRES EQUAL CKSN KC BSS KI(IMSI) VLR SIM RAND 16byte KI 16byte kc 8byte SERS 4byte CKSN low 3bits of 1byte IMSI(n)
  6. 6. Authentication and Ciphering Sequence HLR MS BSS MSC VLR 1 Pre-send Triples to VLR
  7. 7. HLR MS BSS MSC VLR RAND RAND < SDCCH> Authentication and Ciphering Sequence 1 Pre-send Triples to VLR 2 Authenticate Authentication Request
  8. 8. HLR MS BSS MSC VLR RAND RAND < SDCCH> < SDCCH> ( SRES) Authentication and Ciphering Sequence 1 Pre-send Triples to VLR 2 Authenticate Authentication Request 3 Authenticate Response
  9. 9. HLR MS BSS MSC VLR RAND RAND < SDCCH> < SDCCH> ( SRES) Authentication and Ciphering Sequence 1 Pre-send Triples to VLR 2 Authenticate Authentication Request 3 Authenticate Response 4 Start Ciphering
  10. 10. HLR MS BSS MSC VLR 5 Cipher Mode Command Cipher Mode Complete < SDCCH> < SDCCH> 1 Pre-send Triples to VLR 2 Authenticate Authentication Request RAND RAND < SDCCH> 3 Authenticate Response < SDCCH> ( SRES) 4 Start Ciphering Authentication and Ciphering Sequence
  11. 11. TMSI Reallocation MS VLR Location Update Req Location Update Acc TMSI Reallocation Comp (TMSI)
  12. 12. Equipment Identification MS BSS MSC VLR HLR PSTN 1 Equipment ID Request < SDCCH> EIR
  13. 13. MS BSS MSC VLR HLR PSTN 1 Equipment ID Request < SDCCH> 2 ID Response < SDCCH> IMEI) EIR Equipment Identification
  14. 14. MS BSS MSC VLR HLR PSTN 1 Equipment ID Request < SDCCH> 2 ID Response < SDCCH> IMEI) 3 Check IMEI Check IMEI Response EIR Equipment Identification
  15. 15. GSM Basic Call Sequence Mobile to Land Sequence Land to Mobile Sequence Mobile Initiated Call Clearing Sequence
  16. 16. GSM Basic Call Sequence The process for calling MS and called MS are two independent flow. The calling party begins with channel request and ends with TCH assignment competition. In general, the calling party includes following several stages: access process, authentication and ciphering process, TCH assignment process. So, we take the sequence from mobile to land as example, in this sequence, we mainly devote to the calling party.
  17. 17. Mobile to Land Sequence MS BSS MSC VLR HLR 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED PSTN
  18. 18. MS BSS MSC VLR HLR 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC PSTN Mobile to Land Sequence
  19. 19. MS BSS MSC VLR HLR 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC 3 AUTHENTICATION SET Cipher MODE PSTN Mobile to Land Sequence
  20. 20. MS BSS MSC VLR HLR 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC 3 AUTHENTICATION SET Cipher MODE 4 SET-UP < SDCCH> Call Info PSTN SFOC Mobile to Land Sequence
  21. 21. MS BSS MSC VLR HLR 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC 3 AUTHENTICATION SET Cipher MODE 4 SET-UP < SDCCH> Call Info 5 EQUIP. ID REQ. PSTN SFOC Mobile to Land Sequence
  22. 22. MS BSS MSC VLR HLR 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC 3 AUTHENTICATION SET Cipher MODE 4 SET-UP < SDCCH> Call Info 5 EQUIP. ID REQ. 6 COMPLETE CALL CALL PROCEEDING < SDCCH> PSTN SFOC Mobile to Land Sequence
  23. 23. Mobile to Land Sequence 7 ASSIG. COMMAND < SDCCH> ASSIG. COMPLETE circuit < FACCH> MS BSS MSC VLR HLR PSTN
  24. 24. 7 ASSIG. COMMAND < SDCCH> ASSIG. COMPLETE Address Complete(ACM) Alerting circuit < FACCH> Initial and Final Address 8 Message (IFAM) MS hears ring tone from land phone < FACCH> MS BSS MSC VLR HLR PSTN Mobile to Land Sequence
  25. 25. 7 ASSIG. COMMAND < SDCCH> ASSIG. COMPLETE Address Complete(ACM) Alerting < FACCH> 9 Answer (ANS)Connect circuit < FACCH> Initial and Final Address 8 Message (IFAM) MS hears ring tone from land phone < FACCH> Ring tone stops MS BSS MSC VLR HLR PSTN Mobile to Land Sequence
  26. 26. 7 ASSIG. COMMAND < SDCCH> ASSIG. COMPLETE Address Complete(ACM) Alerting < FACCH> 9 Answer (ANS)Connect 10 Connect Acknowledge < FACCH> circuit < FACCH> < TCH> Initial and Final Address 8 Message (IFAM) MS hears ring tone from land phone < FACCH> Ring tone stops HELLO! MS BSS MSC VLR HLR PSTN BILLING STARTS Mobile to Land Sequence
  27. 27. Question What happens when the calling MS activates the SS of BAOC?
  28. 28. Answer MS BSS MSC VLR HLR 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN < SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC 3 AUTHENTICATION SET Cipher MODE 4 SET-UP < SDCCH> Call Info 5 EQUIP. ID REQ. 6 COMPLETE CALL CALL PROCEEDING < SDCCH> PSTN SFOC Call Barred
  29. 29. GSM Basic Call Sequence For the called party, the flow for the called party begins when MSC sends paging command to the called party, ends when two party start talk. In general, this call flow includes several stages: access process, authentication and ciphering process, TCH assignment process, talk process, release process.
  30. 30. Land to Mobile Sequence MS BSS MSC VLR HLR GMSC ( MSISDN) Initial and Final 1 Address Message PSTN
  31. 31. MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) Initial and Final 1 Address Message PSTN 2 Send Routing Info Land to Mobile Sequence
  32. 32. MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) ( MSRN) Initial and Final 1 Address Message PSTN ( MSRN) ( MSRN) 2 Send Routing Info 3 Routing Info Ack Initial and Final Address Message Land to Mobile Sequence
  33. 33. MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) ( MSRN) ( MSRN) Initial and Final 1 Address Message PSTN ( MSRN) ( MSRN) 2 Send Routing Info 3 Routing Info Ack Initial and Final Address Message 4 Send Info For I/C Call Setup Land to Mobile Sequence
  34. 34. MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) ( MSRN) ( MSRN) ( LAI & TMSI) ( TMSI) ( TMSI) Initial and Final 1 Address Message PSTN ( MSRN) ( MSRN) 2 Send Routing Info 3 Routing Info Ack Initial and Final Address Message 4 Send Info For I/C Call Setup 5 Page Paging Request < PCH> Land to Mobile Sequence
  35. 35. 6 Channel Request DCCH Assign Signaling Link Established Page Response *Authentication <RACH> <AGCH> <SDCCH> <SDCCH> (TMSI) (TMSI & Status) (Status) CR Land to Mobile Sequence MS BSS MSC VLR HLR GMSC PSTN
  36. 36. 6 Channel Request DCCH Assign Signaling Link Established Page Response *Authentication 7 Complete Call Setup <RACH> <AGCH> <SDCCH> <SDCCH> (TMSI) (TMSI & Status) (Status) < TMSI> <SDCCH> CR MS BSS MSC VLR HLR GMSC PSTN Land to Mobile Sequence
  37. 37. 6 Channel Request DCCH Assign Signaling Link Established Page Response *Authentication 7 Complete Call Setup 8 Call Confirmation <RACH> <AGCH> <SDCCH> <SDCCH> (TMSI) (TMSI & Status) (Status) < TMSI> <SDCCH> <SDCCH> CR MS BSS MSC VLR HLR GMSC PSTN Ring Tone at the land phone Land to Mobile Sequence
  38. 38. ( channel) ( circuit) < FACCH> 9 Assignment Command Assignment Complete Alert < TCH> Address Complete Land to Mobile Sequence MS BSS MSC VLR HLR GMSC PSTN Ring Tone at the land phone
  39. 39. < FACCH> ( channel) ( circuit) < FACCH> 9 Assignment Command Assignment Complete Alert < TCH> < FACCH> 10 Connect Connect ACK ANS < TCH> Hello... Address Complete MS BSS MSC VLR HLR GMSC PSTN Billing starts Ring Tone at the land phone Ringing stops at land phone Subscriber picks up Land to Mobile Sequence
  40. 40. Questions Please give the sequence: 1.The called MS is powered off. 2.The called MS activates the CFU to a PSTN No. 3.The called MS has been barred all incoming call. 4.The Called MS are not known at HLR
  41. 41. 1. The called MS is powered off MS BSS MSC VLR HLR GMSC ( MSISDN) ( MSISDN) ( IMSI) Initial and Final 1 Address Message 2 Send Routing Info 3 Routing Info Ack PSTN Subscriber Absent The Land hears the announcement of mobile is powered off Answers
  42. 42. 2. The called MS activates the CFU to a PSTN No. (MSISDN) (MSISDN) CFN 4 IFAM Answers MS BSS MSC VLR HLR GMSC PSTN Initial and Final 1 Address Message 2 Send Routing Info 3 Routing Info Ack
  43. 43. Answers 3. The called MS has been barred all incoming call. Call Barred MS BSS MSC VLR HLR GMSC (MSISDN) (MSISDN) Initial and Final 1 Address Message 2 Send Routing Info 3 Routing Info Ack PSTN
  44. 44. Answers 4. The Called MS are not known at HLR Unknown Subscriber MS BSS MSC VLR HLR GMSC (MSISDN) (MSISDN) Initial and Final 1 Address Message 2 Send Routing Info 3 Routing Info Ack PSTN
  45. 45. MS BSS MSC VLR HLR < FACCH> < FACCH> 1 Disconnect PSTN PSTN Release Mobile Release Mobile Initiated Call Clearing Sequence
  46. 46. MS BSS MSC VLR HLR < FACCH> < FACCH> < FACCH> 1 Disconnect PSTN PSTN Release Mobile Release 2 PSTN Release Complete Mobile Release Complete MS-MSC Signalling Released Mobile Initiated Call Clearing Sequence
  47. 47. MS BSS MSC VLR HLR < FACCH> < FACCH> < FACCH> < FACCH> 1 Disconnect PSTN PSTN Release Mobile Release 2 PSTN Release Complete Mobile Release Complete MS-MSC Signalling Released 3 Clear Command Channel Release Mobile Initiated Call Clearing Sequence
  48. 48. Mobile Initiated Call Clearing Sequence < FACCH> <FACCH> 4 DISC UA Clear Complete MS BSS MSC VLR HLR PSTN
  49. 49. Mobile Initiated Call Clearing Sequence < FACCH> <FACCH> 4 DISC UA Clear Complete 5 RLSD Release Complete MS BSS MSC VLR HLR PSTN
  50. 50. Brief Introduction to Location Update Location Update Sequence Several Typical Location Update Sequences
  51. 51. The types of Location Update : Brief Introdution to Location Update Periodic Location Update IMSI Attach/Detach Normal Location Update
  52. 52. Several Typical Location Update Sequences Intra-VLR Location Update Sequence Inter-VLR Location Update Sequence
  53. 53. Intra-VLR Location Update Sequence MS BSS MSC VLR <RACH> 1 Channel Request <AGCH> DCCH Assign HLR Only sent to HLR if this is the first time the MS has Location Updated in this VLR
  54. 54. Intra-VLR Location Update Sequence MS BSS MSC VLR <RACH> 1 Channel Request <AGCH> DCCH Assign 2 Location Update Request <SDCCH> HLR Only sent to HLR if this is the first time the MS has Location Updated in this VLR
  55. 55. Intra-VLR Location Update Sequence MS BSS MSC VLR <RACH> 1 Channel Request <AGCH> DCCH Assign 2 Location Update Request <SDCCH> LAI & TMSI 3 Authentication & Ciphering HLR Only sent to HLR if this is the first time the MS has Location Updated in this VLR
  56. 56. Intra-VLR Location Update Sequence MS BSS MSC VLR <RACH> 1 Channel Request <AGCH> DCCH Assign 2 Location Update Request <SDCCH> LAI & TMSI 3 Authentication & Ciphering 4 Forward New TMSI Location Update Accept < TMSI> <SDCCH> <TMSI> HLR Only sent to HLR if this is the first time the MS has Location Updated in this VLR
  57. 57. Intra-VLR Location Update Sequence MS BSS MSC VLR <RACH> 1 Channel Request <AGCH> DCCH Assign 2 Location Update Request <SDCCH> LAI & TMSI 3 Authentication & Ciphering 4 Forward New TMSI Location Update Accept < TMSI> <SDCCH> <TMSI> 5 TMSI Reallocate Complete TMSI ACK < SDCCH> HLR Only sent to HLR if this is the first time the MS has Location Updated in this VLR
  58. 58. Intra-VLR Location Update Sequence MS BSS MSC VLR <RACH> 1 Channel Request <AGCH> DCCH Assign 2 Location Update Request <SDCCH> LAI & TMSI 3 Authentication & Ciphering 4 Forward New TMSI Location Update Accept < TMSI> <SDCCH> <TMSI> 5 TMSI Reallocate Complete TMSI ACK < SDCCH> 6 Clear Command Clear Complete < SDCCH> < SDCCH> HLR Only sent to HLR if this is the first time the MS has Location Updated in this VLR
  59. 59. Location Update via IMSI Location Update via TMSI Inter-VLR Location Update Sequence
  60. 60. < RACH> 1 Channel Request < AGCH> DCCH Assign MS BSS MSC VLRn HLR VLRo Inter-VLR Location Update Via IMSI
  61. 61. < RACH> 1 Channel Request < AGCH> DCCH Assign 2 Location Update Request < SDCCH> MS BSS MSC VLRn HLR VLRo Inter-VLR Location Update Via IMSI LAI & IMSI
  62. 62. < RACH> 1 Channel Request < AGCH> DCCH Assign 2 Location Update Request < SDCCH> LAI & IMSI Authentication & Ciphering MS BSS MSC VLRn HLR 3 Authentication Para. Req VLRo . Inter-VLR Location Update Via IMSI
  63. 63. < RACH> 1 Channel Request < AGCH> DCCH Assign 2 Location Update Request < SDCCH> LAI & IMSI Authentication & Ciphering MS BSS MSC VLRn HLR 3 Authentication Para. Req 4 Location Update Request Insert Subscriber Data Insert Subscriber Data Ack Location Update accept VLRo Inter-VLR Location Update Via IMSI
  64. 64. < RACH> 1 Channel Request < AGCH> DCCH Assign 2 Location Update Request < SDCCH> LAI & IMSI Authentication & Ciphering MS BSS MSC VLRn HLR 3 Authentication Para. Req 4 Location Update Request Insert Subscriber Data Insert Subscriber Data Ack Location Update accept VLRo 5 Cancellocation Cancellocation Ack . Inter-VLR Location Update Via IMSI
  65. 65. 6 Forward New TMSI Location Update Accept TMSI Reallocate Complete TMSI ACK Inter-VLR Location Update Via IMSI MS BSS MSC VLRn HLR VLRo
  66. 66. 6 Forward New TMSI Location Update Accept TMSI Reallocate Complete TMSI ACK 7 Clear Command Clear Complete Inter-VLR Location Update Via IMSI MS BSS MSC VLRn HLR VLRo
  67. 67. < RACH> 1 Channel Request < AGCH> DCCH Assign MS BSS MSC VLRn HLR VLRo Inter-VLR Location Update Via TMSI
  68. 68. < RACH> 1 Channel Request < AGCH> DCCH Assign 2 Location Update Request < SDCCH> MS BSS MSC VLRn HLR VLRo Inter-VLR Location Update Via TMSI LAI & TMSI
  69. 69. < RACH> 1 Channel Request < AGCH> DCCH Assign 2 Location Update Request < SDCCH> LAI & TMSI MS BSS MSC VLRn HLR VLRo . Inter-VLR Location Update Via TMSI Authentication & Ciphering 3 Provide Identification provide Identification Ack TMSI&LAIO TMSI,IMSI,KC,R,S)
  70. 70. < RACH> 1 Channel Request < AGCH> DCCH Assign 2 Location Update Request < SDCCH> LAI & TMSI MS BSS MSC VLRn HLR VLRo Inter-VLR Location Update Via TMSI Authentication & Ciphering 3 Provide Identification provide Identification Ack TMSI&LAIO TMSI,IMSI,KC,R,S) 4 Location Update Request Insert Subscriber Data Insert Subscriber Data Ack Location Update accept
  71. 71. Inter-VLR Location Update Via TMSI MS BSS MSC VLRn HLR VLRo 5 Cancellocation Cancellocation Ack .
  72. 72. Inter-VLR Location Update Via TMSI 6 Forward New TMSI Location Update Accept TMSI Reallocate Complete TMSI ACK MS BSS MSC VLRn HLR VLRo 5 Cancellocation Cancellocation Ack .
  73. 73. Inter-VLR Location Update Via TMSI 6 Forward New TMSI Location Update Accept TMSI Reallocate Complete TMSI ACK 7 Clear Command Clear Complete MS BSS MSC VLRn HLR VLRo 5 Cancellocation Cancellocation Ack .
  74. 74. The mobile originated short message transfer procedure is separated from mobile terminated. The basic short message sequence consists of two parts: MO SMS Transfer and MT SMS Transfer. Short Message Sequence
  75. 75. MS BSS MSC VLR Interworking MSC 1 CHANNEL REQUEST <RACH> <AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED SC MO SMS Transfer
  76. 76. MS BSS MSC VLR Interworking MSC 1 CHANNEL REQUEST <RACH> <AGCH> DCCH ASSIGN <SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC SC MO SMS Transfer
  77. 77. MS BSS MSC VLR Interworking MSC 1 CHANNEL REQUEST <RACH> <AGCH> DCCH ASSIGN <SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC 3 AUTHENTICATION SET Cipher MODE SC MO SMS Transfer
  78. 78. MS BSS MSC VLR Interworking MSC 1 CHANNEL REQUEST <RACH> <AGCH> DCCH ASSIGN <SDCCH> SIGNALING LINK ESTABLISHED 2 REQ. FOR SERVICE CR CC 3 AUTHENTICATION SET Cipher MODE SC 4 RP_MO_DATA SIF_MO_SMS SIF_MO_SMS-Ack MO SMS Transfer
  79. 79. 5 MO_Forward_SM Short_Message MO_Forward_SM_Ack Short_Message_Ack (SC_No.) MO SMS Transfer MS BSS MSC VLR Interworking MSC SC
  80. 80. 5 MO_Forward_SM Short_Message MO_Forward_SM_Ack Short_Message_Ack 6 RP_ACK (SC_No.) MO SMS Transfer MS BSS MSC VLR Interworking MSC SC &quot;Send Successfully&quot; is displayed on the mobile
  81. 81. MT SMS Transfer For Forwarding a Short Message For Forwarding Several Short Message
  82. 82. MS Servicing MSC VLR HLR Gateway MSC SC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT SMS Transfer (A Message)
  83. 83. MS Servicing MSC VLR HLR Gateway MSC SC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM 2 SIF_MT_SMS Page Page MT SMS Transfer (A Message)
  84. 84. MS Servicing MSC VLR HLR Gateway MSC SC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM 2 SIF_MT_SMS Page Page 3 Paging Response Authentication and Ciphering MT SMS Transfer (A Message)
  85. 85. MS Servicing MSC VLR HLR Gateway MSC SC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM 2 SIF_MT_SMS Page Page Request 3 Paging Response Authentication and Ciphering 4 Short_Message Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack MT SMS Transfer (A Message)
  86. 86. MS Servicing MSC VLR HLR Gateway MSC SC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT SMS Transfer (Several Messages) MT_Forward_SM (The More message To Send Flag is True)
  87. 87. MS Servicing MSC VLR HLR Gateway MSC SC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT SMS Transfer (Several Messages) MT_Forward_SM (The More message To Send Flag is True) 2 SIF_MT_SMS Page Paging Request
  88. 88. MS Servicing MSC VLR HLR Gateway MSC SC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT SMS Transfer (Several Messages) MT_Forward_SM (The More message To Send Flag is True) 2 SIF_MT_SMS Page Paging Request 3 Paging Response Authentication and Ciphering
  89. 89. MS Servicing MSC VLR HLR Gateway MSC SC 4 Short_Message Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack MT SMS Transfer (Several Messages)
  90. 90. MS Servicing MSC VLR HLR Gateway MSC SC 4 Short_Message Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack MT SMS Transfer (Several Messages) 5 Short_Message MT_Forward_SM MT_Forward_SM (The More message To Send Flag is False) Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack Short_Message
  91. 91. What is the sequence when the originating subscriber sets the wrong SC No. in the mobile station. Question
  92. 92. MO_Forward_SM Short_Message MO_Forward_SM_Ack Short_Message_Ack RP_ACK (SC_No.) MS BSS MSC VLR Interworking MSC SC &quot;Send Not Successfully&quot; is displayed on the mobile Answer Illegal Subscriber Illegal Subscriber
  93. 93. Handover Sequence Inter - BSS handover sequence Inter - MSC handover sequence
  94. 94. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> Inter - BSS Handover Sequence
  95. 95. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> 2 Handover required Inter - BSS Handover Sequence
  96. 96. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> 2 Handover required 3 Handover Request TMSI cct. code Inter - BSS Handover Sequence
  97. 97. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> 2 Handover required 3 Handover Request 4 Handover REQ ACK TMSI cct. code HO Ref. No. Inter - BSS Handover Sequence
  98. 98. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> 2 Handover required 3 Handover Request 5 Handover Command 4 Handover REQ ACK TMSI cct. code HO Ref. No. HO Ref. No. <FACCH> Inter - BSS Handover Sequence
  99. 99. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> 2 Handover required 3 Handover Request 5 Handover Command 4 Handover REQ ACK TMSI cct. code HO Ref. No. HO Ref. No. <FACCH> 6 Information Interchange <FACCH> Inter - BSS Handover Sequence
  100. 100. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> 2 Handover required 3 Handover Request 5 Handover Command 4 Handover REQ ACK TMSI cct. code HO Ref. No. HO Ref. No. <FACCH> 6 Information Interchange <FACCH> 7 Handover Complete Inter - BSS Handover Sequence
  101. 101. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> 2 Handover required 3 Handover Request 5 Handover Command 4 Handover REQ ACK TMSI cct. code HO Ref. No. HO Ref. No. <FACCH> 6 Information Interchange <FACCH> 7 Handover Complete 8 Clear Command Inter - BSS Handover Sequence
  102. 102. MS oBSS nBSS MSC 1 Periodic Measurement reports <SACCH> 2 Handover required 3 Handover Request 5 Handover Command 4 Handover REQ ACK TMSI cct. code HO Ref. No. HO Ref. No. <FACCH> 6 Information Interchange <FACCH> 7 Handover Complete 8 Clear Command 9 Periodic Meas. reports <SACCH> Inter - BSS Handover Sequence
  103. 103. Inter - MSC Handover Sequence Basic Inter-MSC handover Subsequent Inter - MSC handover
  104. 104. MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message 3 Send Handover Report Address Completed Answer Basic Inter-MSC handover
  105. 105. MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message 3 Send Handover Report Address Completed Answer Basic Inter-MSC handover
  106. 106. MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message 3 Send Handover Report Address Completed Answer Basic Inter-MSC handover
  107. 107. MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message 3 Send Handover Report Address Completed Answer Basic Inter-MSC handover
  108. 108. MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message 3 Send Handover Report Address Completed Answer Basic Inter-MSC handover
  109. 109. MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message 3 Send Handover Report Address Completed Answer Basic Inter-MSC handover
  110. 110. MSC/VLRA MSC/VLRB 7 Process Access Signal Send End Signal Forward Access Signal Process Access Signal 8 Clear Forward Release Guard Send End Signal_Ack Basic Inter-MSC handover
  111. 111. MSC/VLRA MSC/VLRB 7 Process Access Signal Send End Signal Forward Access Signal Process Access Signal 8 Release Release Complete Send End Signal_Ack Basic Inter-MSC handover
  112. 112. MSC/VLRA MSC/VLRB HLRA 9 SendAuth. Info Auth Info Update Location InsertSubs.Data InsertSubs.Data_Ack UpdateLocation_Ack Cancellocation Cancellocation_Ack Basic Inter-MSC handover
  113. 113. MSC/VLRA MSC/VLRB HLRA 1 PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2 Initial and Final Address Message Address Complete Answer 3 RLS RLC Subsequent Inter-MSC handover
  114. 114. MSC/VLRA MSC/VLRB HLRA 1 PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2 Initial and Final Address Message Address Complete Answer 3 RLS RLC Subsequent Inter-MSC handover
  115. 115. MSC/VLRA MSC/VLRB HLRA 1 PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2 Initial and Final Address Message Address Complete Answer 3 RLS RLC Subsequent Inter-MSC handover
  116. 116. MSC/VLRA MSC/VLRB MSC/VLRC Subsequent Inter-MSC handover ForwardAccessSignal 4 ProcessAccessSignal 7 Location Update SendEndSignal_Ack 6 SendEndSignal 5 RLS RLC
  117. 117. MSC/VLRA MSC/VLRB MSC/VLRC Subsequent Inter-MSC handover 5 RLS RLC 7 Location Update SendEndSignal_Ack 6 SendEndSignal 4 ForwardAccessSignal ProcessAccessSignal
  118. 118. MSC/VLRA MSC/VLRB MSC/VLRC 7 Location Update SendEndSignal_Ack 6 SendEndSignal Subsequent Inter-MSC handover 4 ForwardAccessSignal ProcessAccessSignal 5 RLS RLC
  119. 119. MSC/VLRA MSC/VLRB MSC/VLRC 4 ForwardAccessSignal ProcessAccessSignal 5 RLS RLC 7 Location Update SendEndSignal_Ack 6 SendEndSignal Subsequent Inter-MSC handover
  120. 120. Summary 1. GSM Security Mangement 2. GSM Basic Call Sequence 3. Location UpdateSequence 4. SMS Sequence 5. HandoverSequence
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