Chapter 05.Mobile in -Part2

8/9/2019 Chapter 05.Mobile in -Part2

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E1E1--E2 CME2 CMTECHNICALTECHNICAL

For internal circulation of BSNLonly

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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SCP

(G)MSC/

VLR

S

S

F

A

S

T

-

D

R

5

IVR

VMSRating engine



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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

-

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

-

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

-

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

-

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


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


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:


CgPA:44-181-(MSC)

CAPIMSI: 404-43-123456MSC:44-181-(MSC1)VLR: 44-181-(VLR1)


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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[email protected]



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for BSNL internal circulation only

Documents

Chapter 05.Mobile in -Part2