E1E1--E2 CM E2 CM TECHNICALTECHNICAL

For internal circulation of BSNLonly

MOBILE INTELLIGENT MOBILE INTELLIGENT

NETWORKNETWORK

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

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

Description of some numbers

• IMSI ( E212)/(E214)

– E212 = MCC(3)+MNC(2/3)+MSIN(

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

Basic Structure of CCS#7 Stack

For internal circulation of BSNLonly

How Various layers works

For internal circulation of BSNLonly

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

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

SP Based Message Routing

For internal circulation of BSNLonly

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

GT Based Routing

For internal circulation of BSNLonly

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

GSM Recall

For internal circulation of BSNLonly

CAMEL

For internal circulation of BSNLonly

CAMEL Phase-1

For internal circulation of BSNLonly

CAMEL Phase-2

For internal circulation of BSNLonly

CAMEL Phase-3

For internal circulation of BSNLonly

Call FlowsService Provisioning

For internal circulation of BSNLonly

� Originating Charged call

� Terminating Charged call

� Refill

Call Flows

� Refill

For internal circulation of BSNLonly

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

THANKSjai_bsnl2002@yahoo.com

0942580102709425801027

For internal circulation of BSNLonly

for BSNL internal circulation only