chapter 05.mobile in -part2
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E1E1--E2 CME2 CMTECHNICALTECHNICAL
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MOBILE INTELLIGENTMOBILE INTELLIGENT
NETWORKNETWORK
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Topics
Prerequisite for mobile communication.
Basic structure of CCS#7 Protocol Stack and there
functions as applicable to Mobile IN.
.
Call flows in IN.
Discussions
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Prerequisite for mobile
communication
GSM follows the ETSI recommendation.
All the messages, number, nomenclature used in
GSM/GPRS are standardized by ETSI so that inter-
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Description of some numbers
IMSI ( E212)/(E214)
E212 = MCC(3)+MNC(2/3)+MSIN(
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Description of some numbers
TMSI(32 Bits)-Coded Hex decimally
LAI:- Identity of LAC
MCC+MNC+LAC(16 Bits)
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Basic Structure of CCS#7 Stack
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How Various layers works
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Types of message routing in CCS#7
Two types of routing
Based on SPC (OPC & DPC).
Based on GTT.
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SPC Based Message Routing
Each machine has a point code(14/24 bits) in the network and it is
known with this address.
Message has a OPC ( Originating Point Code) & DPC ( Destination
Point Code).
essage a so as user par escr p on a w c par o mac ne s
going to use it.
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SP Based Message Routing
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GT Based Routing
Routing of message is based on SP as well as a sub system number.
The subsystem number is called as Global Title (GT).
GT based routing is used when SP is not known.
GT is local number either a IMSI or MSISDN depending upon the
agreemen .
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GT Based Routing
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CAP Signalling over Signalling System 7
(ITU-T standard SS7 recommendations)
MSC/VLR Service...
...
...
CAP Signalling EntityTransaction Capability Application Part
Signalling Connection Control PartMessage Transfer PartPhysical Network
TCAP
SCCP
MTP
TCAP
SCCP
MTP
SCCP
MTP
MSC/VLR STP SCP
GT Translation
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GSM Recall
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CAMEL
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CAMEL Phase-1
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CAMEL Phase-2
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CAMEL Phase-3
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Call FlowsService Provisioning
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Originating Charged call
Terminating Charged call
Refill
Call Flows
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Originating Charged Call 1(3)HLR
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
1
2 3
4
IVR
VMS
Rating Engine
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Originating Charged Call 2(3)HLR
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
5
IVR
VMSRating engine
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Originating Charged Call 3(3)HLR
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
7
6
8
IVR
VMSRating Engine
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Terminating Charged Call 1(4)HLR
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
1
3
2
IVR
VMSRating Engine
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Terminating Charged Call 2(4)HLR
SCP
(G)MSC/
VLR
S
S
F
AS
T
-
D
R
4 5
6
IVR
VMSRating Engine
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Terminating Charged Call 3(4)
HLR
SCP
(G)MSC/
VLR
S
S
F
AS
T
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D
R
7
IVR
VMSRating engime
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Terminating Charged Call 4(4)
HLR
SCP
(G)MSC/
VLR
S
S
F
AS
T
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D
R
9
8
10
IVR
VMSRating engine
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Refill 1(2)
HLR
SCP
(G)MSC/
VLR
S
S
F
AS
T
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D
R
1
IVR
VMSRating enginr
2 3
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Refill 2(2)
HLR
SCP
(G)MSC/
VLR
S
S
F
AS
T
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D
R
6
4
IVR
VMSRating engine
5
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Originating Call
5
3 6
Rating HLRGMSC
/gsmSSF
/gsmSCF
SCP
gsmSCF
1
2
7
8
HPLMN
VPLMN
MSC/VLR/gsmSSF
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HLR SCP
IN trigger
Service Logic
(MO Service)
HPLMN
IN Call Set up - MO Call
MSC
BSC BSC
GMSCVLR
MS
gsmSSF
Dialled
number:+27 83 212
9911
VPLMN
+27 83 212 9911
(diversion address)
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Terminating Call
SCP
gsmSCF
GMSC
6
47
1 A
Rating
MSC/VLR/gsmSSF
HPLMN
VPLMN
,
10B
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HLR SCP
IN
Service Logic
(MT Service)
HPLMN
VPLMN
SRI
PSIPSI SRI
IN Call Set up - MT Call
MSC
BSC BSC
GMSCVLR
MS
gsmSSF
+27 83 212
9911
IPLMN
Res es
Second HLR
interrogation..
.Transit GMSC
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Inbound Roamer CAMEL
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Inbound Roamer CAMEL
Scenarios
3. IDP2. IDP
BSNL-Circle1
NLDHLR
GMSC
6. RRB_resp
5. ISD
TAX
KOLKATTA UK
GMSCSpice/VSNL
5. RRB
SCCPCdPA: 44-181-SCPCgPA: 91944300020-MSC
The RRB_resp messagewill be modified by SRS as:
SCCP
7. RRB_resp
4. RRB
8. CONNECTFor RRBCSM, CONNECT etc
SCCPCdPA: 91-9814 -SRS MSC
9.CONNECT
SCF
1. IDP
UK
Subscriber
VMSC/VLR/
SSF
SRS
HLR /VMSC/VLR / SMSCSSF/SCF
The IDP message will be modified by SRS as:
SCCPCdPA: 44-181-SCPCgPA: 91-9814-SRS MSC
CAPIMSI: 234-15-123456MSC: 91-9814-SRS MSC1VLR : 91-9814-SRS VLR1
SCCPCdPA: 44-181-SCP
CgPA:91944300020(MSC)
CAPIMSI: 234-15-123456MSC:91944300020(MSC1)VLR: 91944300021(VLR1)
CdPA: 44-181-SCPCgPA: 91-9814 -SRS MSC
CgPA: 44-181-SCP
CAPInformation relevant to message
SRS will modify theMessage to:
SCCPCdPA: 91944300020(MSC)CgPA: 44-181-SCP
CAPInformation relevant to messa
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O tb d R CAMEL
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Outbound Roamer CAMEL
Scenarios
3. IDP2. IDP
BSNL-Circle1
NLD
HLR
GMSC
6. RRB_resp
5. ISD
TAX
KOLKATTAUK
GMSCSpice/VSNL
5. RRB
SCCPCdPA: 91-9814-SCPCgPA:44-181-(MSC)
The RRB_resp messagewill be modified by SRS as:
SCCP
7. RRB_resp
4. RRB
8. CONNECTFor RRBCSM, CONNECT etc
SCCPCdPA: 44-181-(MSC)
9.CONNECT
SCF
1. IDP
BSNL
Subscriber
VMSC/VLR/
SSF
SRS
HLR /VMSC/VLR / SMSCSSF/SCF
The IDP message will be modified by SRS as:
SCCPCdPA: 91-9443-SCP
CgPA:44-181-(MSC)
CAPIMSI: 404-43-123456MSC:44-181-(MSC1)VLR: 44-181-(VLR1)
SCCPCdPA: 91-9814-SCP
CgPA:44-181-(MSC)
CAPIMSI: 40414-19-123456MSC:44-181-(MSC1)VLR: 44-181-(VLR1)
CdPA: CdPA: 91-9443-SCP
CgPA:44-181-(MSC)
CgPA: 91-9443-SCP
CAPInformation relevant to message
SRS will modify theMessage to:
SCCPCdPA: 44-181-(MSC)CgPA: 91-9814-SCPCAPInformation relevant to messa
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for BSNL internal circulation only