chap15

Mobile Number Portability : 

Mobile Number Portability Nclab 오재준 mega5@kw.ac.kr

Introduction : 

Introduction Number portability Subscriber to keep a “unique” telephone number Enhance fair competition among telco. To improve customer service quality Three kinds of number portability Location portability Service portability Operator portability CLEC (competitive local exchange carrier) ILEC (incumbent local exchange carrier)

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

15.1 Fixed-Network Number Portability (1/2)

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

15.1 Fixed-Network Number Portability(2/2) Extra call setup costs Initial System Setup Costs Customer Transfer Costs

15.1 Cost Recovery : 

15.1 Cost Recovery r : recipient operator d : donor operator o : origination operator c : customer db : the party who manages number portability database

15.2 Number Portability for Mobile Networks : 

15.2 Number Portability for Mobile Networks Mobile 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

15.3 Mobile Number Portability Mechanisms : 

15.3 Mobile Number Portability Mechanisms Two restriction The GMSC must be in the call path for the provision of special features and services, as well as for billing 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

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

15.3.1 Signaling Relay Approach 1/2 (SRA 1/2) SRA 1 SRA 2 IRN (Intermediate Routing Number)

Tromboning trunk setup in SRF 2 : 

Tromboning trunk setup in SRF 2

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

15.3.2 All-Call-Query Approach 1/2 (ACQ 1/2) ACQ1 ACQ2

15.4 Implementation Costs for mobile Number portability : 

15.4 Implementation Costs for mobile Number portability Comparison of Mobile Number portability Solution Cost Recovery mobile number portability solutions