Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

Mobile Number PortabilityMobile Number Portability

NclabNclab오재준오재준

mega5@kw.ac.krmega5@kw.ac.kr

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

IntroductionIntroduction

Number portabilityNumber portability Subscriber to keep a “unique” telephone number Enhance fair competition among telco. To improve customer service quality

Three kinds of number portabilityThree kinds of number portability Location portability Service portability Operator portability

CLEC (competitive local exchange carrier)CLEC (competitive local exchange carrier) ILEC (incumbent local exchange carrier)ILEC (incumbent local exchange carrier)

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

15.1 Fixed-Network Number Portability 15.1 Fixed-Network Number Portability (1/2)(1/2)

Switch1 2 3

4 5 6

7 8 9

* 8 #

Switch

Originating Network Donor Network

Switch1 2 3

4 5 6

7 8 9

* 8 #

Recipient NetworkPorted Number

1

2

Switch1 2 3

4 5 6

7 8 9

* 8 #

Switch

Originating Network Donor Network

Switch1 2 3

4 5 6

7 8 9

* 8 #

Recipient NetworkPorted Number

1

2

Switch1 2 3

4 5 6

7 8 9

* 8 #

Switch

Originating Network Donor Network

1

2

Switch1 2 3

4 5 6

7 8 9

* 8 #

Recipient NetworkPorted Number

NPDatabase

3

Switch1 2 3

4 5 6

7 8 9

* 8 #

Switch

Originating Network Donor Network

1

2

Switch1 2 3

4 5 6

7 8 9

* 8 #

Recipient NetworkPorted Number

NPDatabase

3

4

(a) Call Forwarding (b) Call Drop-back

(c) Query-on-Release (d) All-Call-Query

Signaling path

Trunk setup path

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

15.1 Fixed-Network Number 15.1 Fixed-Network Number Portability(2/2)Portability(2/2)

NUMBER NUMBER PORTABILITY PORTABILITY SOLUTIONSOLUTION

ROUTING ROUTING INDEPENDENCINDEPENDENCEE

EXTRA CALL EXTRA CALL SETUP COST SETUP COST

INITIAL INITIAL SYSTEM SYSTEM SETUP COSTSETUP COST

Call ForwardingCall Forwarding lowlow pcpctt lowlow

Call Drop-backCall Drop-back mediummedium ccss mediummedium

Query-on-ReleaseQuery-on-Release mediummedium p (cp (css + c + cdd)) highhigh

All-Call-QueryAll-Call-Query highhigh ccss highhigh

Extra call setup costs

Initial System Setup Costs

Customer Transfer Costs

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

15.1 Cost Recovery15.1 Cost Recovery

NUMBER NUMBER PORTABILITY PORTABILITY SOLUTIONSOLUTION

CUSTOMER CUSTOMER TRANSFER TRANSFER COSTCOST

EXTRA CALL EXTRA CALL SETUP COST SETUP COST

INITIAL INITIAL SYSTEM SYSTEM SETUP COSTSETUP COST

Call ForwardingCall Forwarding rr->->d ; cd ; c->->rr oo->->dd ownown

Call Drop-backCall Drop-back rr->->d ; cd ; c->->rr oo->->dd ownown

Query-on-ReleaseQuery-on-Release rr->->d, db ;cd, db ;c->->rr oo->->d, od, o->->dbdb ownown

All-Call-QueryAll-Call-Query rr->->db ;cdb ;c->->rr oo->->dbdb ownown r : recipient operatorr : recipient operator d : donor operator d : donor operator o : origination operatoro : origination operator c : customerc : customer db : the party who manages number db : the party who manages number

portability databaseportability database

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

15.2 Number Portability for Mobile 15.2 Number Portability for Mobile NetworksNetworks

Mobile phone is associated with two numberMobile phone is associated with two number Directory number (MSISDN in GSM) Identification number (IMSI in GSM) MSISDN and IMSI pair is assigned to the user MIN (mobile identification number) ,MDN ( mobile directory

number) are used in EIA/TIA IS-41 based system Typically assume that both MIN and MDN have the same

value To support portability, separation of MIN and MDN is

required Location update Mobile call origination Mobile call termination

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

15.3 Mobile Number Portability 15.3 Mobile Number Portability MechanismsMechanisms

MSC

1 2 3

4 5 6

7 8 9

* 8 #

Switch PSTN

Visited System

1. Incoming call

Originating switch

4. Trunk Setupto Serving MSC GMSC

HLR

2. QueryMSRN

3. ReturnMSRN

Home System

Two restrictionTwo restriction1. The GMSC must be in the call path for the provision of

special features and services, as well as for billing2. The originating switch does not have the capability of

query the HLR database, which must be done by GMSC

Simplified GSM call termination procedure and tromboning routing

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

15.3.1 Signaling Relay Approach 1/2 (SRA 1/2)15.3.1 Signaling Relay Approach 1/2 (SRA 1/2)

1 2 3

4 5 6

7 8 9

* 8 #

PSTN

Originating switch

6. Trunk Setupto Serving MSC

MSC

HLR

3. Query MSRN 4. Return MSRN

Recipient Network

HLRGMSC

2. Query MSRN

SignalingRelay

Function

5. MSRN

DonorNetwork

Switch

1. Incomingcall

1 2 3

4 5 6

7 8 9

* 8 #

PSTN

Originating switch

6. Trunk Setupto Recipient MSCusing IRN

GMSCHLR

3. Query IRN4. Return IRN

Recipient Network

HLRGMSC

2. Query IRN

SignalingRelay

Function

5. IRN

DonorNetwork

Switch

1. Incomingcall

Gateway

9. Trunk setupto serving MSC

MSC

7. Query MSRN

8. Return MSRN

SRA 1 SRA 2

IRN (Intermediate Routing Number)

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

Tromboning trunk setup in SRF 2Tromboning trunk setup in SRF 2

1. Incomingcall

GMSC MSC

HLR

SignalingRelay

Function

HLRGMSC Donor

NetworkA

2. Qrery IRN 5. IRN

3. Query IRN 4. Return IRN

7. Query MSRN8. Return MSRN

9. Trunk setupto serving MSC

Originatingswitch

MS q MS p

Recipient Network B

6. Trunk Setupto Recipient MSCusing IRN

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

15.3.2 All-Call-Query Approach 1/2 (ACQ 1/2)15.3.2 All-Call-Query Approach 1/2 (ACQ 1/2)

GMSC

HLR

4. Query MSRN

6. Trunk Setupto Serving MSC

Recipient Network

MSC

5. Return MSRN

1. Incoming call

3. Trunk Setup to Gateway MSC using IRN

1 2 3

4 5 6

7 8 9

* 8 #

Originating switch

1. Query IRNSwitch

NPDatabase

PSTN

2. Return IRN1. Incoming call

5. Trunk Setup to Serving MSC

1 2 3

4 5 6

7 8 9

* 8 #

Originating switch

1. Query MSRNSwitch

NPDatabase

PSTN

4. Return MSRN

MSC

HLR

2. Query MSRN 3. Return MSRN

SingalingRelayfunction

ACQ1 ACQ2

Kwangwoon Univ.http://netcom.kw.ac.kr

Wireless and Mobile Network Architectures

15.4 Implementation Costs for mobile Number portability15.4 Implementation Costs for mobile Number portability

NUMBER NUMBER PORTABILITY PORTABILITY SOLUTIONSOLUTION

ROUTING ROUTING INDEPENDENCINDEPENDENCEE

EXTRA CALL EXTRA CALL SETUP COST SETUP COST

INITIAL INITIAL SYSTEM SYSTEM SETUP COSTSETUP COST

SRA 1SRA 1 lowlow ccss mediummedium

SRA 2SRA 2 lowlow 2c2css + pc + pctt mediummedium

ACQ 1ACQ 1 highhigh ccss mediummedium

ACQ 2ACQ 2 highhigh ccss - c - ctt mediummedium

NUMBER NUMBER PORTABILITY PORTABILITY SOLUTIONSOLUTION

CUSTOMER CUSTOMER TRANSFER TRANSFER COSTCOST

EXTRA CALL EXTRA CALL SETUP COST SETUP COST

INITIAL INITIAL SYSTEM SYSTEM SETUP COSTSETUP COST

SRA 1SRA 1 rr->->d (db) ; cd (db) ; c--

>>rroo->->d, dd, d->->db db ownown

SRA 2SRA 2 rr->->d (db) ; cd (db) ; c--

>>rroo->->d, r, dd, r, d--

>>db db ownown

ACQ 1ACQ 1 rr->->db ;cdb ;c->->rr oo->->dbdb ownown

ACQ 2ACQ 2 rr->->db ;cdb ;c->->rr oo->->dbdb ownown

Comparison of Mobile Number portability Solution

Cost Recovery mobile number portability solutions