(Mobile Terminated Call) AXE DT_5

8/12/2019 (Mobile Terminated Call) AXE DT_5

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Objectives

MT call signaling sequences

DTs for MT call


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Signaling Sequences in GSM

Mobile Terminated Call

Normal Mobile Terminated Call

GMSC HLR VLR

Incoming Call

MSISDN Op. Send Routing Info Op. Provide Roaming Number

Roaming Number Provision Roaming Number Provision

ISUP call to the MSRN


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Mobile Terminated Call but MS detached or outof coverage

GMSC HLR VLR

Incoming Call


Return of the Forwarded Number CFNRC Subscriber is dettached or absent

ISUP call to the Forwarded number


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Terminated Call to MS but MS has CFU active

GMSC HLR VLR

Incoming Call

MSISDN Op. Send Routing Info

Return of the Forwarded Number CFU

ISUP call to the Forwarded number


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Terminated Call to MS but MS is busy or does not reply

and CFB or CFNRY is activatedGMSC HLR VLR

Incoming Call


Roaming Number Provision Roaming Number Provision

ISUP call to the MSRN

ISUP call to Forw. Number


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DTs for MT Call


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GMSC/VLR

Telecommunication

Service Analysis Pre-analysis B-number analysis

Routing Case analysisANRSI

RC CCH BR ROUTING SP DATA

23 NO P01=1 R=FIXGRI MM1 ..

65 YES P01=1 R=.. MM1

. . . .. .. ...

R= ISDNI

FNR, MNP

QUERY

4

HOME

SUBSCRIBER

MSRN

REQUEST


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DTs for MT Call

Incoming call to

694xxx

FLNAN

Subscriber is Home or

Imported?

HLR

Normal interrogation

Call is released with specific

Cause Code 14

TT=249,SSN=6

NOYES

TT=128,SSN=253, NS=30694


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DTs for MT Call


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MT Call


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EXERCISES

Printout Commands

Define MSRNS

Define RC

Define B-number Analysis

Documents

(Mobile Terminated Call) AXE DT_5