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OMA GSM Communication Flow

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Presentation on theme: "OMA GSM Communication Flow"— Presentation transcript:

1 OMA000003 GSM Communication Flow
GSM System OMA GSM Communication Flow Lecturer: Wang Hui

2 CONTENT GSM Security Management GSM Basic Call Sequence
Location Update Sequence SMS Sequence Handover Sequence

3 GSM Security Management
Authentication and Ciphering Sequence TMSI Reallocation Equipment Identification

4 Authentication Authentication may be executed during setup, location updating and supplementary services

5 Authentication Sequence
HLR/AUC AUC HLR IMSI(m) KI（M) VLR SIM IMSI(n) KI（N) KI(IMSI) RAND GENERATOR A8 A3 AUTH REQ RAND KC SRES KI(IMSI) CKSN RAND IMSIBUFFER RAND A8 A3 RAND 16byte KI 16byte kc 8byte SERS 4byte CKSN low 3bits of 1byte RAND KC SRES 1 2 5 KC BSS RAND KC SRES TEMP DATA KC SRES SRES EQUAL RAND KC SRES

6 Authentication and Ciphering Sequence
MS BSS MSC VLR HLR 1 Pre-send Triples to VLR

7 Authentication and Ciphering Sequence
MS BSS MSC VLR HLR 1 Pre-send Triples to VLR RAND 2 Authenticate RAND Authentication Request < SDCCH>

8 Authentication and Ciphering Sequence
MS BSS MSC VLR HLR 1 Pre-send Triples to VLR RAND 2 Authenticate RAND Authentication Request < SDCCH> 3 Authenticate Response < SDCCH> ( SRES)

9 Authentication and Ciphering Sequence
MS BSS MSC VLR HLR 1 Pre-send Triples to VLR RAND 2 Authenticate RAND Authentication Request < SDCCH> 3 Authenticate Response < SDCCH> ( SRES) 4 Start Ciphering

10 Authentication and Ciphering Sequence
MS BSS MSC VLR HLR 1 Pre-send Triples to VLR RAND 2 Authenticate RAND Authentication Request < SDCCH> 3 Authenticate Response < SDCCH> ( SRES) 4 Start Ciphering < SDCCH> 5 Cipher Mode Command Cipher Mode Complete < SDCCH>

11 TMSI Reallocation MS VLR Location Update Req (TMSI)
Location Update Acc TMSI Reallocation Comp

12 Equipment Identification
MS BSS MSC VLR HLR PSTN EIR 1 Equipment ID < SDCCH> Request

13 Equipment Identification
MS BSS MSC VLR HLR PSTN EIR 1 Equipment ID < SDCCH> Request < SDCCH> 2 ID Response IMEI)

14 Equipment Identification
MS BSS MSC VLR HLR PSTN EIR 1 Equipment ID < SDCCH> Request < SDCCH> 2 ID Response IMEI) 3 Check IMEI Check IMEI Response

15 GSM Basic Call Sequence
Mobile to Land Sequence Land to Mobile Sequence Mobile Initiated Call Clearing Sequence

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 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED

18 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED < SDCCH> CR 2 REQ. FOR SERVICE CC

19 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED < SDCCH> CR 2 REQ. FOR SERVICE CC 3 AUTHENTICATION SET Cipher MODE

20 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED < SDCCH> CR 2 REQ. FOR SERVICE CC 3 AUTHENTICATION SET Cipher MODE < SDCCH> SFOC 4 SET-UP Call Info

21 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED < SDCCH> CR 2 REQ. FOR SERVICE CC 3 AUTHENTICATION SET Cipher MODE < SDCCH> SFOC 4 SET-UP Call Info 5 EQUIP. ID REQ.

22 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN 1 CHANNEL REQUEST < RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED < SDCCH> CR 2 REQ. FOR SERVICE CC 3 AUTHENTICATION SET Cipher MODE < SDCCH> SFOC 4 SET-UP Call Info 5 EQUIP. ID REQ. 6 COMPLETE CALL < SDCCH> CALL PROCEEDING

23 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN < SDCCH> 7 ASSIG. COMMAND circuit < FACCH> ASSIG. COMPLETE

24 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN < SDCCH> 7 ASSIG. COMMAND circuit < FACCH> ASSIG. COMPLETE Initial and Final Address 8 Message (IFAM) Address Complete(ACM) < FACCH> Alerting MS hears ring tone from land phone

25 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN < SDCCH> 7 ASSIG. COMMAND circuit < FACCH> ASSIG. COMPLETE Initial and Final Address 8 Message (IFAM) Address Complete(ACM) < FACCH> Alerting MS hears ring tone from land phone 9 Answer (ANS)Connect < FACCH> Ring tone stops

26 Mobile to Land Sequence
MS BSS MSC VLR HLR PSTN < SDCCH> 7 ASSIG. COMMAND circuit < FACCH> ASSIG. COMPLETE Initial and Final Address 8 Message (IFAM) Address Complete(ACM) < FACCH> Alerting MS hears ring tone from land phone 9 Answer (ANS)Connect < FACCH> Ring tone stops BILLING STARTS < FACCH> 10 Connect Acknowledge HELLO! < TCH>

27 Question What happens when the calling MS activates the SS of BAOC?

28 Answer MS BSS MSC VLR HLR PSTN SFOC Call Barred 1 CHANNEL REQUEST <
RACH> < AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED < SDCCH> CR 2 REQ. FOR SERVICE CC 3 AUTHENTICATION SET Cipher MODE < SDCCH> SFOC 4 SET-UP Call Info 5 EQUIP. ID REQ. Call Barred 6 COMPLETE CALL < SDCCH> CALL PROCEEDING

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 Land to Mobile Sequence
MS BSS MSC VLR HLR GMSC PSTN Initial and Final 1 Address Message ( MSISDN)

31 Land to Mobile Sequence
MS BSS MSC VLR HLR GMSC PSTN Initial and Final 1 Address Message ( MSISDN) 2 Send Routing Info ( MSISDN) ( IMSI)

32 Land to Mobile Sequence
MS BSS MSC VLR HLR GMSC PSTN Initial and Final 1 Address Message ( MSISDN) 2 Send Routing Info ( MSISDN) ( IMSI) 3 Routing Info Ack ( MSRN) ( MSRN) Initial and Final Address Message ( MSRN)

33 Land to Mobile Sequence
MS BSS MSC VLR HLR GMSC PSTN Initial and Final 1 Address Message ( MSISDN) 2 Send Routing Info ( MSISDN) ( IMSI) 3 Routing Info Ack ( MSRN) ( MSRN) Initial and Final Address Message ( MSRN) 4 Send Info For I/C Call Setup ( MSRN)

34 Land to Mobile Sequence
MS BSS MSC VLR HLR GMSC PSTN Initial and Final 1 Address Message ( MSISDN) 2 Send Routing Info ( MSISDN) ( IMSI) 3 Routing Info Ack ( MSRN) ( MSRN) Initial and Final Address Message ( MSRN) 4 Send Info For I/C Call Setup ( MSRN) 5 Page < PCH> Paging Request ( LAI & TMSI) ( TMSI) ( TMSI)

35 Land to Mobile Sequence
MS BSS MSC VLR HLR GMSC PSTN 6 Channel Request <RACH> DCCH Assign <AGCH> Signaling Link <SDCCH> Established <SDCCH> Page Response CR (TMSI) *Authentication (TMSI & Status) (Status)

36 Land to Mobile Sequence
MS BSS MSC VLR HLR GMSC PSTN 6 Channel Request <RACH> DCCH Assign <AGCH> Signaling Link <SDCCH> Established <SDCCH> Page Response CR (TMSI) *Authentication (TMSI & Status) (Status) 7 Complete Call < TMSI> Setup <SDCCH>

37 Ring Tone at the land phone
Land to Mobile Sequence MS BSS MSC VLR HLR GMSC PSTN 6 Channel Request <RACH> DCCH Assign <AGCH> Signaling Link <SDCCH> Established <SDCCH> Page Response CR (TMSI) *Authentication (TMSI & Status) (Status) 7 Complete Call < TMSI> Setup <SDCCH> <SDCCH> Ring Tone at the land phone 8 Call Confirmation

38 Ring Tone at the land phone
Land to Mobile Sequence MS BSS MSC VLR HLR GMSC PSTN 9 Assignment Command ( channel) ( circuit) Assignment < FACCH> Ring Tone at the land phone Complete < TCH> Alert Address Complete

39 Ring Tone at the land phone Ringing stops at land phone
Land to Mobile Sequence MS BSS MSC VLR HLR GMSC PSTN 9 Assignment Command ( channel) ( circuit) Assignment < FACCH> Ring Tone at the land phone Complete < TCH> Alert Address Complete < FACCH> Ringing stops at land phone 10 Connect Subscriber picks up FACCH> Billing starts < Connect ACK ANS < TCH> Hello...

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 Answers 1. The called MS is powered off MS BSS MSC VLR HLR GMSC PSTN
Initial and Final 1 Address Message ( MSISDN) 2 Send Routing Info ( IMSI) ( MSISDN) 3 Routing Info Ack Subscriber Absent The Land hears the announcement of mobile is powered off

42 Answers 2. The called MS activates the CFU to a PSTN No. MS BSS MSC
VLR HLR GMSC PSTN Initial and Final (MSISDN) 1 Address Message 2 Send Routing Info (MSISDN) 3 Routing Info Ack CFN 4 IFAM

43 Answers 3. The called MS has been barred all incoming call. MS BSS MSC
VLR HLR GMSC PSTN Initial and Final 1 Address Message (MSISDN) 2 Send Routing Info (MSISDN) 3 Routing Info Ack Call Barred

44 Answers 4. The Called MS are not known at HLR MS BSS MSC VLR HLR GMSC
PSTN Initial and Final 1 Address Message (MSISDN) 2 Send Routing Info (MSISDN) 3 Routing Info Ack Unknown Subscriber

45 Mobile Initiated Call Clearing Sequence
MS BSS MSC VLR HLR PSTN 1 Disconnect < FACCH> PSTN Release < FACCH> Mobile Release

46 Mobile Initiated Call Clearing Sequence
MS BSS MSC VLR HLR PSTN 1 Disconnect < FACCH> PSTN Release < FACCH> Mobile Release 2 PSTN Release Complete Mobile Release < FACCH> Complete MS-MSC Signalling Released

47 Mobile Initiated Call Clearing Sequence
MS BSS MSC VLR HLR PSTN 1 Disconnect < FACCH> PSTN Release < FACCH> Mobile Release 2 PSTN Release Complete Mobile Release < FACCH> Complete MS-MSC Signalling Released 3 Clear Command < FACCH> Channel Release

48 Mobile Initiated Call Clearing Sequence
MS BSS MSC VLR HLR PSTN <FACCH> 4 DISC < FACCH> UA Clear Complete

49 Mobile Initiated Call Clearing Sequence
MS BSS MSC VLR HLR PSTN <FACCH> 4 DISC < FACCH> UA Clear Complete 5 RLSD Release Complete

50 Location Update Sequence
Brief Introduction to Location Update Several Typical Location Update Sequences

51 Brief Introdution to Location Update
The types of Location Update : Periodic Location Update IMSI Attach/Detach Normal Location Update

52 Intra-VLR Location Update Sequence Inter-VLR Location Update Sequence
Several Typical Location Update Sequences Intra-VLR Location Update Sequence Inter-VLR Location Update Sequence

53 Intra-VLR Location Update Sequence
MS BSS MSC VLR HLR <RACH> 1 Channel Request <AGCH> DCCH Assign Only sent to HLR if this is the first time the MS has Location Updated in this VLR

54 Intra-VLR Location Update Sequence
MS BSS MSC VLR HLR <RACH> 1 Channel Request <AGCH> DCCH Assign Only sent to HLR if this is the first time the MS has Location Updated in this VLR <SDCCH> 2 Location Update Request

55 Intra-VLR Location Update Sequence
MS BSS MSC VLR HLR <RACH> 1 Channel Request <AGCH> DCCH Assign Only sent to HLR if this is the first time the MS has Location Updated in this VLR <SDCCH> 2 Location Update Request LAI & TMSI 3 Authentication & Ciphering

56 Intra-VLR Location Update Sequence
MS BSS MSC VLR HLR <RACH> 1 Channel Request <AGCH> DCCH Assign Only sent to HLR if this is the first time the MS has Location Updated in this VLR <SDCCH> 2 Location Update Request LAI & TMSI 3 Authentication & Ciphering < TMSI> 4 Forward New TMSI <SDCCH> Location Update Accept <TMSI>

57 Intra-VLR Location Update Sequence
MS BSS MSC VLR HLR <RACH> 1 Channel Request <AGCH> DCCH Assign Only sent to HLR if this is the first time the MS has Location Updated in this VLR <SDCCH> 2 Location Update Request LAI & TMSI 3 Authentication & Ciphering < TMSI> 4 Forward New TMSI <SDCCH> Location Update Accept <TMSI> 5 TMSI Reallocate Complete < SDCCH> TMSI ACK

58 Intra-VLR Location Update Sequence
MS BSS MSC VLR HLR <RACH> 1 Channel Request <AGCH> DCCH Assign Only sent to HLR if this is the first time the MS has Location Updated in this VLR <SDCCH> 2 Location Update Request LAI & TMSI 3 Authentication & Ciphering < TMSI> 4 Forward New TMSI <SDCCH> Location Update Accept <TMSI> 5 TMSI Reallocate Complete < SDCCH> TMSI ACK < SDCCH> 6 Clear Command < SDCCH> Clear Complete

59 Inter-VLR Location Update Sequence
Location Update via IMSI Location Update via TMSI

60 Inter-VLR Location Update Via IMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign

61 Inter-VLR Location Update Via IMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign < SDCCH> 2 Location Update Request LAI & IMSI

62 Inter-VLR Location Update Via IMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign < SDCCH> 2 Location Update Request LAI & IMSI 3 Authentication Para. Req Authentication & Ciphering .

63 Inter-VLR Location Update Via IMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign < SDCCH> 2 Location Update Request LAI & IMSI 3 Authentication Para. Req Authentication & Ciphering 4 Location Update Request Insert Subscriber Data Insert Subscriber Data Ack Location Update accept

64 Inter-VLR Location Update Via IMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign < SDCCH> 2 Location Update Request LAI & IMSI 3 Authentication Para. Req Authentication & Ciphering 4 Location Update Request Insert Subscriber Data Insert Subscriber Data Ack Location Update accept 5 Cancellocation Cancellocation Ack .

65 Inter-VLR Location Update Via IMSI
BSS MSC VLRn HLR VLRo 6 Forward New TMSI Location Update Accept TMSI Reallocate Complete TMSI ACK

66 Inter-VLR Location Update Via IMSI
BSS MSC VLRn HLR VLRo 6 Forward New TMSI Location Update Accept TMSI Reallocate Complete TMSI ACK 7 Clear Command Clear Complete

67 Inter-VLR Location Update Via TMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign

68 Inter-VLR Location Update Via TMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign < SDCCH> 2 Location Update Request LAI & TMSI

69 Inter-VLR Location Update Via TMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign < SDCCH> 2 Location Update Request LAI & TMSI 3 Provide Identification TMSI&LAIO provide Identification Ack TMSI,IMSI,KC,R,S) Authentication & Ciphering .

70 Inter-VLR Location Update Via TMSI
BSS MSC VLRn HLR VLRo < RACH> 1 Channel Request < AGCH> DCCH Assign < SDCCH> 2 Location Update Request LAI & TMSI TMSI&LAIO 3 Provide Identification TMSI,IMSI,KC,R,S) provide Identification Ack Authentication & Ciphering 4 Location Update Request Insert Subscriber Data Insert Subscriber Data Ack Location Update accept

71 Inter-VLR Location Update Via TMSI
BSS MSC VLRn HLR VLRo 5 Cancellocation Cancellocation Ack .

72 Inter-VLR Location Update Via TMSI
BSS MSC VLRn HLR VLRo 5 Cancellocation Cancellocation Ack . 6 Forward New TMSI Location Update Accept TMSI Reallocate Complete TMSI ACK

73 Inter-VLR Location Update Via TMSI
BSS MSC VLRn HLR VLRo 5 Cancellocation Cancellocation Ack . 6 Forward New TMSI Location Update Accept TMSI Reallocate Complete TMSI ACK 7 Clear Command Clear Complete

74 Short Message Sequence
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.

75 MO SMS Transfer MS BSS MSC VLR SC Interworking MSC <RACH>
1 CHANNEL REQUEST <AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED

76 MO SMS Transfer MS BSS MSC VLR SC Interworking MSC <RACH>
1 CHANNEL REQUEST <AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED <SDCCH> CR 2 REQ. FOR SERVICE CC

77 MO SMS Transfer MS BSS MSC VLR SC Interworking MSC <RACH>
1 CHANNEL REQUEST <AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED <SDCCH> CR 2 REQ. FOR SERVICE CC 3 AUTHENTICATION SET Cipher MODE

78 MO SMS Transfer MS BSS MSC VLR SC Interworking MSC <RACH>
1 CHANNEL REQUEST <AGCH> DCCH ASSIGN SIGNALING LINK ESTABLISHED <SDCCH> CR 2 REQ. FOR SERVICE CC 3 AUTHENTICATION SET Cipher MODE 4 RP_MO_DATA SIF_MO_SMS SIF_MO_SMS-Ack

79 MO SMS Transfer MS BSS MSC VLR SC Interworking MSC (SC_No.)
5 MO_Forward_SM Short_Message Short_Message_Ack MO_Forward_SM_Ack

80 MO SMS Transfer MS BSS MSC VLR SC Interworking MSC (SC_No.)
5 MO_Forward_SM Short_Message Short_Message_Ack MO_Forward_SM_Ack 6 RP_ACK "Send Successfully" is displayed on the mobile

81 MT SMS Transfer For Forwarding a Short Message
For Forwarding Several Short Message

82 MT SMS Transfer (A Message)
Servicing Gateway MS VLR HLR SC MSC MSC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM

83 MT SMS Transfer (A Message)
Servicing Gateway MS VLR HLR SC MSC MSC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM 2 SIF_MT_SMS Page Page

84 MT SMS Transfer (A Message)
Servicing Gateway MS VLR HLR SC MSC MSC 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

85 MT SMS Transfer (A Message)
Servicing Gateway MS VLR HLR SC MSC MSC 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

86 MT SMS Transfer (Several Messages)
Servicing Gateway MS VLR HLR SC MSC MSC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT_Forward_SM (The More message To Send Flag is True)

87 MT SMS Transfer (Several Messages)
Servicing Gateway MS VLR HLR SC MSC MSC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM MT_Forward_SM (The More message To Send Flag is True) 2 SIF_MT_SMS Page Paging Request

88 MT SMS Transfer (Several Messages)
Servicing Gateway MS VLR HLR SC MSC MSC 1 Short Message SRI_For_SM SRI_For_SM_Ack MT_Forward_SM 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 MT SMS Transfer (Several Messages)
Servicing Gateway MS VLR HLR SC MSC MSC 4 Short_Message Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack

90 MT SMS Transfer (Several Messages)
Servicing Gateway MS VLR HLR SC MSC MSC 4 Short_Message Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack 5 Short_Message MT_Forward_SM MT_Forward_SM (The More message To Send Flag is False) Short_Message Short_Message_Ack MT_Forward_SM_Ack Short_Message_Ack

91 Question What is the sequence when the originating subscriber sets the wrong SC No. in the mobile station.

92 Answer MS BSS MSC VLR SC Interworking MSC (SC_No.) MO_Forward_SM
Short_Message Short_Message_Ack Illegal Subscriber MO_Forward_SM_Ack Illegal Subscriber RP_ACK "Send Not Successfully" is displayed on the mobile

93 Handover Sequence Inter - BSS handover sequence
Inter - MSC handover sequence

94 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports

95 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports 2 Handover required

96 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports 2 Handover required 3 Handover Request TMSI cct. code

97 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports 2 Handover required 3 Handover Request TMSI cct. code HO Ref. No. 4 Handover REQ ACK

98 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports 2 Handover required 3 Handover Request TMSI cct. code HO Ref. No. 4 Handover REQ ACK 5 Handover Command <FACCH> HO Ref. No.

99 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports 2 Handover required 3 Handover Request TMSI cct. code HO Ref. No. 4 Handover REQ ACK 5 Handover Command <FACCH> HO Ref. No. 6 Information Interchange <FACCH>

100 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports 2 Handover required 3 Handover Request TMSI cct. code HO Ref. No. 4 Handover REQ ACK 5 Handover Command <FACCH> HO Ref. No. 6 Information Interchange <FACCH> 7 Handover Complete

101 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports 2 Handover required 3 Handover Request TMSI cct. code HO Ref. No. 4 Handover REQ ACK 5 Handover Command <FACCH> HO Ref. No. 6 Information Interchange <FACCH> 7 Handover Complete 8 Clear Command

102 Inter - BSS Handover Sequence
oBSS nBSS MSC MS <SACCH> 1 Periodic Measurement reports 2 Handover required 3 Handover Request TMSI cct. code HO Ref. No. 4 Handover REQ ACK 5 Handover Command <FACCH> HO Ref. No. 6 Information Interchange <FACCH> 7 Handover Complete 8 Clear Command 9 Periodic Meas. reports <SACCH>

103 Inter - MSC Handover Sequence
Basic Inter-MSC handover Subsequent Inter - MSC handover

104 Basic Inter-MSC handover
MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 3 Send Handover Report 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message Address Completed Answer

105 Basic Inter-MSC handover
MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 3 Send Handover Report 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message Address Completed Answer

106 Basic Inter-MSC handover
MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 3 Send Handover Report 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message Address Completed Answer

107 Basic Inter-MSC handover
MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 3 Send Handover Report 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message Address Completed Answer

108 Basic Inter-MSC handover
MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 3 Send Handover Report 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message Address Completed Answer

109 Basic Inter-MSC handover
MSCA MSCB VLRB 1 PrepareHandover 2 Allocate HandoverNo. 3 Send Handover Report 4 PrepareHandover_Ack 5 Send HO Report_Ack 6 Initial Address Message Address Completed Answer

110 Basic Inter-MSC handover
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

111 Basic Inter-MSC handover
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

112 Basic Inter-MSC handover
MSC/VLRA MSC/VLRB HLRA 9 SendAuth. Info Auth Info Update Location InsertSubs.Data InsertSubs.Data_Ack UpdateLocation_Ack Cancellocation Cancellocation_Ack

113 Subsequent Inter-MSC handover
MSC/VLRA MSC/VLRB HLRA 1 PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2 Initial and Final Address Message Address Complete Answer 3 RLS RLC

114 Subsequent Inter-MSC handover
MSC/VLRA MSC/VLRB HLRA 1 PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2 Initial and Final Address Message Address Complete Answer 3 RLS RLC

115 Subsequent Inter-MSC handover
MSC/VLRA MSC/VLRB HLRA 1 PrepareSubsequentHOV PrepareHandover PrepareHandover PrepareSubsequentHOV 2 Initial and Final Address Message Address Complete Answer 3 RLS RLC

116 Subsequent Inter-MSC handover
MSC/VLRA MSC/VLRB MSC/VLRC 4 ProcessAccessSignal ForwardAccessSignal 5 RLS RLC 6 SendEndSignal SendEndSignal_Ack 7 Location Update

117 Subsequent Inter-MSC handover
MSC/VLRA MSC/VLRB MSC/VLRC 4 ForwardAccessSignal ProcessAccessSignal 5 RLS RLC 6 SendEndSignal SendEndSignal_Ack 7 Location Update

118 Subsequent Inter-MSC handover
MSC/VLRA MSC/VLRB MSC/VLRC 4 ForwardAccessSignal ProcessAccessSignal 5 RLS RLC 6 SendEndSignal SendEndSignal_Ack 7 Location Update

119 Subsequent Inter-MSC handover
MSC/VLRA MSC/VLRB MSC/VLRC 4 ForwardAccessSignal ProcessAccessSignal 5 RLS RLC 6 SendEndSignal SendEndSignal_Ack 7 Location Update

120 Summary 1. GSM Security Mangement 2. GSM Basic Call Sequence
3. Location UpdateSequence 4. SMS Sequence 5. HandoverSequence

121

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1 Channel Overview 3 Types 1.Broadcast Control Channel: Point to Multipoint, Downlink (BTS) to MS) (A)BCCH (Board cast Control Channel) It inform the Mobile.
Presentation on GSM Regional Telecom Training Centre Nikhilesh Mohanty

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By Neha choudhary Asst.Professor CSE/IT LHST-A. ï‚ž GSM-Introduction ï‚ž Architecture ï‚ž Technical Specifications ï‚ž Characteristics and features ï‚ž Applications.

By Neha choudhary Asst.Professor CSE/IT LHST-A. ï‚ž GSM-Introduction ï‚ž Architecture ï‚ž Technical Specifications ï‚ž Characteristics and features ï‚ž Applications.
GSM standard (continued). Multiple Access Methods Frequency Division Multiple Access (FDMA) Frequency 1 ch Frequency 2 ch Frequency N ch Time Division.

GSM standard (continued). Multiple Access Methods Frequency Division Multiple Access (FDMA) Frequency 1 ch Frequency 2 ch Frequency N ch Time Division.
GSM standard (continued)

GSM standard (continued)
Modes Mobile Station ( MS )

Modes Mobile Station ( MS )
Cellular Mobile Communication Systems Lecture 7

Cellular Mobile Communication Systems Lecture 7
Mobile Handset Cellular Network Basics + GSM. Cellular Network Basics There are many types of cellular services; before delving into details, focus on.

Mobile Handset Cellular Network Basics + GSM. Cellular Network Basics There are many types of cellular services; before delving into details, focus on.

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