Network Attachment Process

MS

. Cell should be of selected PLMN.

Switch -on

Measure strongest RF channel to find relevant BCCH

PLMN Selection

Cell Selection

Location Update

Idle-Mode

. Cell should not be “ barred “.

. Radio path loss between BTS and the MS must be below a threshold set by the operator.

( Register its presence to the network. )

Limited service

fails

TAX CA

TAX ND

GMSC MSC

GMSC MSC/VLR

ND Mobile moves to CA and Powers on MS

CA

ND

HLR

HLR

ND

MS

9810098111CA

ND

( Update Location/ Authentication )

De register Mobile to Old VLR

ACK from old MSC/VLR

VLR

LOCATION UPDATION

VLR

VPLMN

HPLMN

Location Update

( TMSI, LAI )

LU Accept

( New TMSI)

Update Location

Update Location

LU Accept

(Subs data)

LU Accept

Update Location

LU Accept

LU Accept

New VLR records subscriber data.

• ListensBCCH/FCCH

TAX ND

GMSC MSC/VLR

1. ND PSTN Subscriber Dials ND Mobile Subscriber in ND.

ND

LE TANDEM

HLR

ND

MS

9810098100NDSRI

PRN to MSC/VLR

ND

ACK from MSC/VLR

ND (MSRN)

MSRN

MSISDN

MSISDNMSISDN

Page(TMSI)

TAX ND

TAX CA

GMSC MSC/VLR

GMSC MSC/VLR

2. ND PSTN Subscriber Dials CA Mobile Subscriber in CA.

ND

CA

LE

HLR

HLR

CA

MS

9881098300

ND

CA

SRI

PRN to MSC/VLR

CA

ACK from MSC/VLR CA (MSRN)

MSRN

MSISDN

Page(TMSI)

TANDEM

MSISDN

MSISDNMSISDN

TAX CA

TAX ND

GMSC MSC/VLR

GMSC MSC/VLR

3. ND PSTN Subscriber Dials ND Mobile Subscriber in CA.

CA

ND

LE TANDEM

HLR

HLR

ND

MS

9810098200CA

NDSRI

PRN to MSC/VLR

CA

ACK from MSC/VLR CA (MSRN)

MSRN

MSRN

MSRN

MSRN

MSISDN

MSISDNMSISDN

Page(TMSI)

TAX CA

TAX ND

GMSC MSC/VLR

GMSC MSC/VLR

4. CA PSTN Subscriber Dials ND Mobile Subscriber in CA.

CA

ND

LE

HLR

HLR

ND

MS

9810098400

CA

ND

SRI

PRN to MSC/VLR

CA

ACK from MSC/VLR CA (MSRN)

MSRN

MSISDN

Page(TMSI)

TANDEM

MSISDN

MSISDNMSISDN

MSRN

MSRN

MSRN

TAX CA

TAX ND

GMSC MSC/VLR

GMSC MSC/VLR

4.A CA PSTN Subscriber Dials ND Mobile Subscriber in CA

CA

ND

LE

HLR

HLRND

MS

9810098410

CA

ND

PRN to MSC/VLR

CA

ACK from MSC/VLR CA (MSRN)

MSRN

Page(TMSI)

TANDEM

MSISDNMSISDN

Roaming agreement with Optimal Routing

SRI

TAX CA

TAX ND

GMSC MSC

GMSC MSC/VLR

5. CA Mobile Subscriber Dials ND Mobile Subscriber in ND.

CA

ND

HLR

HLR

CA

MS

9881098500

CA

ND

SRI

PRN to MSC/VLR

ND

ACK from MSC/VLR ND (MSRN)

MSRN

MSISDN

Page(TMSI)

MSISDN

ND

MS

9810098500

MSISDNVLR

Subs. data check

ACK

MSISDN

TAX CA

TAX ND

GMSC MSC

GMSC MSC/VLR

6. CA Mobile Subscriber Dials ND Mobile Subscriber in CA.

CA

ND

HLR

HLRCA

MS

9881098600

CA

NDSRI

PRN to MSC/VLR

CA

ACK from MSC/VLR CA (MSRN)

MSRN

MSISDN

Page(TMSI)

MSISDN ND

MS

9810098600

MSISDN

VLR

Subs. data check

ACK

MSISDN

MSRN

MSRN

MSRN

TAX CA

TAX ND

GMSC MSC

GMSC MSC/VLR

7. ND Mobile Subscriber in CA Dials ND Mobile in ND.

CA

ND

HLR

HLRND

MS

9810098700

CA

ND

SRI

PRN to MSC/VLR

ND

ACK from MSC/VLR ND (MSRN)

MSRNMSISDN

Page(TMSI)

MSISDN

ND

MS

9810098710

MSISDN

VLR

Subs. data check

ACK

MSISDN

TAX CA

TAX ND

GMSC MSC

GMSC MSC/VLR

8. CA Mobile in ND Dials ND Mobile Subscriber in CA.

CA

ND

HLR

HLR

ND

MS

9810098800

CA

ND

SRI

PRN to MSC/VLR

CA

ACK from MSC/VLR CA (MSRN)

MSRNMSRN

Page(TMSI)

CA

MS

9881098800

VLR

Subs. data check ACK

MSISDN

MSRN

MSRN