ee11--e2 cm e2 cmtraining.bsnl.co.in/digital_library_source/upgradation/e1... · 2019. 3. 15. ·...
TRANSCRIPT
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E1E1--E2 CM E2 CM TECHNICALTECHNICAL
For internal circulation of BSNLonly
MOBILE INTELLIGENT MOBILE 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.
• Types of routing messages in Mobile IN.• Types of routing messages in Mobile IN.
• Call flows in IN.
• Discussions
For internal circulation of BSNLonly
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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-
operator-ability can be realized easily.operator-ability can be realized easily.
For internal circulation of BSNLonly
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Description of some numbers
• IMSI ( E212)/(E214)
– E212 = MCC(3)+MNC(2/3)+MSIN(<=10)
– E214 = CC(2)+ NDC(2)+ MSIN(10)
• MSISDN (E164)• MSISDN (E164)
– E164 = CC(2)+NDC(2)+SN(8)
For internal circulation of BSNLonly
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Description of some numbers
• TMSI(32 Bits)-Coded Hex decimally
• LAI:- Identity of LAC
– MCC+MNC+LAC(16 Bits)
• MSRN:- Local MSISDN number used for mobile terminating calls.• MSRN:- Local MSISDN number used for mobile terminating calls.
For internal circulation of BSNLonly
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Basic Structure of CCS#7 Stack
For internal circulation of BSNLonly
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How Various layers works
For internal circulation of BSNLonly
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Types of message routing in CCS#7
Two types of routing
• Based on SPC (OPC & DPC).
• Based on GTT.• Based on GTT.
For internal circulation of BSNLonly
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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).
• Message also has user part description that which part of machine is • Message also has user part description that which part of machine is
going to use it.
For internal circulation of BSNLonly
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SP Based Message Routing
For internal circulation of BSNLonly
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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
agreement.agreement.
For internal circulation of BSNLonly
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GT Based Routing
For internal circulation of BSNLonly
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CAP Signalling over Signalling System 7
(ITU-T standard SS7 recommendations)
gsmSSF
MSC/VLR
gsmSCF
Service...…
...…
…...
CAP Signalling EntityTransaction Capability Application Part
Signalling Connection Control PartMessage Transfer PartPhysical Network
gsmSSF
TCAP
SCCP
MTP
gsmSCF
TCAP
SCCP
MTP
SCCP
MTP
MSC/VLR STP SCP
GT Translation
For internal circulation of BSNLonly
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GSM Recall
For internal circulation of BSNLonly
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CAMEL
For internal circulation of BSNLonly
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CAMEL Phase-1
For internal circulation of BSNLonly
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CAMEL Phase-2
For internal circulation of BSNLonly
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CAMEL Phase-3
For internal circulation of BSNLonly
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Call FlowsService Provisioning
For internal circulation of BSNLonly
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� Originating Charged call
� Terminating Charged call
� Refill
Call Flows
� Refill
For internal circulation of BSNLonly
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Originating Charged Call 1(3)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
1
2 3
4
IVR
VMSRating Engine
For internal circulation of BSNLonly
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Originating Charged Call 2(3)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
5
IVR
VMSRating engine
For internal circulation of BSNLonly
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Originating Charged Call 3(3)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
7
6
8
IVR
VMSRating Engine
For internal circulation of BSNLonly
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Terminating Charged Call 1(4)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
1
3
2
IVR
VMSRating Engine
For internal circulation of BSNLonly
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Terminating Charged Call 2(4)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
4 5
6
IVR
VMSRating Engine
For internal circulation of BSNLonly
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Terminating Charged Call 3(4)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
7
IVR
VMSRating engime
For internal circulation of BSNLonly
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Terminating Charged Call 4(4)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
9
8
10
IVR
VMSRating engine
For internal circulation of BSNLonly
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Refill 1(2)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
1
IVR
VMSRating enginr
2 3
For internal circulation of BSNLonly
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Refill 2(2)
HLR
VMS
SCP
(G)MSC/
VLR
S
S
F
A
S
T
-
D
R
6
4
IVR
VMSRating engine
5
For internal circulation of BSNLonly
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Originating Call
5
3 6
Rating HLRGMSC
/gsmSSF
/gsmSCF
SCP
gsmSCF
3 61
2
7
8
HPLMN
VPLMN
MSC/VLR/
gsmSSF
For internal circulation of BSNLonly
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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)
For internal circulation of BSNLonly
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Terminating Call
SCP
gsmSCF
GMSC
/gsmSSF HLR
6
47
2, 8
1A
Rating
/gsmSSF
MSC/VLR/
gsmSSF
HLR
HPLMN
VPLMN
2, 8
10B
For internal circulation of BSNLonly
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HLR SCP
IN
trigger
Service Logic
(MT Service)
HPLMN
VPLMN
SRI
PSIPSI SRI
Res
IN Call Set up - MT Call
MSC
BSC BSC
GMSCVLR
MS
gsmSSFtrigger
+27 83 212
9911
IPLMN
PSI
Res Res
Second HLR
interrogation..
.
Transit GMSC
For internal circulation of BSNLonly
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Inbound Roamer – CAMEL
Scenarios
3. IDP2. IDP
BSNL-Circle1
NLDHLR
GMSC
6. RRB_resp
5. ISDTAX
KOLKATTA UK
GMSCSpice/VSNL5. RRB
SCCP CdPA: 44-181-SCPCgPA: 91944300020-MSC
The RRB_resp message will be modified by SRS as:
SCCP CdPA: 44-181-SCP
7. RRB_resp
4. RRB
8. CONNECT For RRBCSM, CONNECT etc
SCCP CdPA: 91-9814 -SRS MSC CgPA: 44-181-SCP
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
SCCP CdPA: 44-181-SCPCgPA:91944300020(MSC)
CAPIMSI: 234-15-123456MSC:91944300020(MSC1)VLR: 91944300021(VLR1)
SCCP CdPA: 44-181-SCPCgPA: 91-9814 -SRS MSC
CdPA: 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 message
For internal circulation of BSNLonly
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Outbound Roamer – CAMEL
Scenarios
3. IDP2. IDP
BSNL-Circle1
NLDHLR
GMSC
6. RRB_resp
5. ISDTAX
KOLKATTAUK
GMSCSpice/VSNL5. RRB
SCCP CdPA: 91-9814-SCPCgPA:44-181-(MSC)
The RRB_resp message will be modified by SRS as:
SCCP CdPA: CdPA: 91-9443-SCP
7. RRB_resp
4. RRB
8. CONNECT For RRBCSM, CONNECT etc
SCCP CdPA: 44-181-(MSC) CgPA: 91-9443-SCP
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:
SCCP
CdPA: 91-9443-SCP
CgPA:44-181-(MSC)
CAPIMSI: 404-43-123456MSC:44-181-(MSC1)VLR: 44-181-(VLR1)
SCCP CdPA: 91-9814-SCPCgPA:44-181-(MSC)
CAPIMSI: 40414-19-123456MSC:44-181-(MSC1)VLR: 44-181-(VLR1)
SCCP CdPA: CdPA: 91-9443-SCP
CgPA:44-181-(MSC)
CdPA: 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 message
For internal circulation of BSNLonly
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for BSNL internal circulation only