Mobile Number Portability (MNP) Implementation in Wire Line Switches Meeting at Circle Office Dated 12. 01. 2010
Agenda 1. What is MNP-An overview? 2. DOT guidelines. 3. What is required to be done in Wire Line Switches and why? 4. Post MNP-How to make Wire Line switches compatible with Mobile Network? 5. Implementation Plan 6. What is required to be done in CDR Billing Project? 7. Responsibilities of Nodal Officers of the Circles 8. Timelines 9. Discussions
Steps already taken: • Completion of Field Trial at Bangalore • Issuing of instructions along with technical note vide letter dated 15. 12. 2009. • Issuing of List of RN • Finalization of solution for making CDR Billing Project compatible with MNP. • Development and field trial of C-DOT patch required for above solution completed.
What is Number Portability? • Portability of Mobile Numbers between all GSM and CDMA operators within the same Service Area. • A Mobile subscriber can change his/her operator within the same Service Area without changing his/her number. • No Portability beyond Service Area. • Portability between GSM and CDMA network of same operator in same service area possible.
What is Number Portability? Later Mobile Number is provisioned in Recipient operator’s HLR First Mobile Number is deprovisioned from Donor operator’s HLR 9420023456 PSTN HLR Wireless Operator A Wireless Operator B Subscriber changes Mobile Service Provider while keeping its mobile number CMTS Licensed Service Area 9420023456
Some Definations • IAM (Initial Address Message)- One of the CCS-7 Message, used to seize the circuit between two xges, contain Calling and Called party number • SSTP- Stand alone STP • STP- Signaling Transfer Point • RN- Routing Number • MCHA- Mobile Clearing House Administration
Some Definations-Contd NPDB- Number Portability Database RN – Routing Number TAX – Trunk Automatic Exchange ILD – International Long Distance TAX NPDB – Number Portability Database Home RN – Operators own RN PSTN – Public Switched Telephone Network, here BSNL Wire line Network PLMN – Public Land Mobile Network, here BSNL GSM Mobile Network
Porting Definations Not Ported – Mobile Numbers belonging to BSNL. These numbers will be defined in the NPDB with HLR (PC & SSN) information. Will be defined in the Range DN Table of the NPDB Imported – Number ported into BSNL from another network. These numbers will be defined in the NPDB with HLR (PC & SSN) information. Will be defined in the Single DN Table of the NPDB. Ported Out – Number Ported out to another network from BSNL. These numbers will be defined in the NPDB with RN information. Will be defined in the Single DN Table of the NPDB. Foreign Number – Other Operator subscriber not known to be ported. These numbers will be defined in the NPDB with RN information. Will be defined in the Range DN Table of the NPDB.
DOT Guidelines • In first Phase MNP is to be implemented in 4 metros and all 5 “A” category LSAs – 9 LSAs in total • In second phase – “B” and “C” category Circles • Deadline: 31. 03. 2010
What is to be done in land Line switches and why? Presently calls are being routed to concerned operator based on dialed number Post MNP ; to route the Mobile calls to correct operator switches has to determine the present operator of the dialed number(B) To know the present operator of the dialed number(RN) , switches need to be connected with external database i. e. LPDB After getting the RN, switch routes the call to concerned operator based on RN+B Information.
Routing and Charging of Mobile Calls in Pre MNP Scenario- Routing of calls from local Xge to L-II TAX Voice and Signaling path LEX PC: 2000 Routing Table Route Code -> Destination 9. . …… 09……. ->PC 4000 (Associated Mode) PSTN Cloud L-II TAX PC: 4000 Route Code-> 94282. . …… 98382……. 09…… Routing Table Destination- Signaling Point Code -> Send to PC 4001 (BSNL MSC) -> Send to PC 4005 ( BHARTI MSC) -> send to PC 5000 (L-I TAX) Charging Table Route Code -> Charging 9. . …… 09……. -> by Next Higher Xge ->by Next Higher Xge Route Code -> 94282. . …… 98382. . …… 094500……. 099567……. Charging ->Charging Defined(intra operator-intra circle) ->Charging Defined(inter operator-intra circle) -> Charging Defined (inter Circle- intra operator) -> Charging Defined (inter Circle- inter operator)
Routing and Charging of Mobile Calls in Pre MNP Scenario- Routing of calls from L-II TAX to L-I TAX/MSC From LEX Route Code-> 94282. . …… 98382……. 09…… L-II TAX PC: 4000 Routing Table Destination -> Send to PC 4001 (BSNL MSC) -> Send to PC 4005 ( BHARTI MSC) -> send to PC 5000 (L-I TAX) Charging Table Route Code -> Charging 94282. . …… ->Charging Defined(intra operator-intra circle) 98382. . …… ->Charging Defined(inter operator-intra circle) 094500……. -> Charging Defined (inter Circle- intra operator) BSNL MSC (PC: 4001) BHARTI MSC (PC: 4005) PSTN Cloud L-I TAX BSNL (PC: 5000)
Routing and Charging Scenario in Present ( Pre MNP) Scenario • Routing and Charging is done in Exchanges based on Dialed Digits ( B Party Number) • For Routing the Fixed to Mobile calls ROUTE CODES are created in Xges • Charging is also based on dialed digits. • By analyzing the Dialed Digits ( B Party Number) in exchanges it is possible to route the code to corresponding MSC/ Landline Xge( for further routing to corresponding MSC) • First 2 or 5 Digits (2 Digits Access Code + 3 Digit MSC code) of a mobile number determines the Mobile operator of the number.
Routing and Charging Scenario in Post MNP Scenario Issues: • In exchanges it would not be possible to route the Fixed to Mobile call to corresponding MSC by analyzing the Dialed Digits ( B Party Number) , because now any Mobile number can belong to any Operator in the Service Area. • Mobile number no longer determines the Mobile operator of the number. • As per DOT guidelines determination of correct Terminating Mobile Operator is the responsibility of the Originating Operator.
What is required to solve the problem: Issues: 1. Getting information for determining present operator of the Mobile Number 2. Using this information to determine correct Routing and Charging in the exchanges.
What is required to solve the problem: Solution: Getting the extra ROUTING information • This extra information will be provided by the Route Number given by the DOT to each operator (one for GSM network and one for CDMA network). • RN for each Mobile Number will be stored in one central Database (NPDB). • Associated RN of each Mobile Number will determine the present operator of the number. • This RN changes when a mobile number is ported to other Mobile Operator.
What is required to solve the problem-contd: Solution: Getting the extra information • These NPDB will be integrated with SSTP • SSTP will intercept IAM (Initial Address Message) passing through it and will scan the B Party Number. • SSTP will get the appropriate RN for the B party number (retrieved from IAM) from integrated NPDB • SSTP will prefix the RN with B party number in the IAM and send it to next destination.
What is required to solve the problem-contd: Solution: Using the extra information • RN codes need to be created in exchanges. • CCS 7 messages related to Fixed to Mobile Calls need to pass through SSTP network, at least once, before call is handed over to corresponding MSCs. • Determination of corresponding MSC , where call can be routed, is based on RN.
Logical Connectivity of Exchanges with SSTP Routing and Charging of Mobile Calls in Pre MNP Scenario. Routing of calls from local Xge to L-II TAX PSTN Cloud L-II TAX PC: 4000 LEX PC: 2000 SSTP Routing and Charging of Mobile Calls in Post MNP Scenario. Routing of calls from local Xge to L-II TAX PC: 4000 LEX PC: 2000 SSTP s SSTP PSTN Cloud
Route Number Solution • Central Database containing the information of association of each mobile number with Mobile Service Operator • Each Operator has been given two unique 4 digit Number( one for GSM and one for CDMA operator) called Routing Number(RN) • Number is called Routing Number as it is used to route the call to correct Service Provider
Flow of RN from NPDB to PSTN Exchanges SSTP Cloud CCS-7 Links RN PSTN Cloud NPDB
Physical Connectivity of Exchanges with SSTP in Post MNP and Call Flow 1. IAM message is tunneled through the permanent C-7 connection from L-II TAX to SSTP 2. RN is retrieved by SSTP from NPDB RN(BHARTI GSM)=5555 9444923456 Trunk Group C 7 link LEX PC: 2000 Voice Path C- 7 HSL connectivity Nailed Up C 7 Connection L-II TAX 5. A new IAM is formed by L-II TAX based on the Routing Table and RN information 6. IAM is sent to corresponding MSC C 7 link CH ii C 4 CH i CH 3. B number iin IAM is replaced by RN+B 4. Modified IAM is sent towards L-II TAX SSTP BHARTI MSC (PC: 4005) 7. MSC checks whether the RN is same as Home RN, if yes, call proceeds otherwise call is rejected PSTN Cloud
Before MNP: Voice and Signaling Path for Fixed to Mobile Calls SDCA-B SDCA-A SDCA-C BSNL/Pvt. Operators CMSP Network SDCA-D Level-II TAX Local cum Tandem Exch. LDCA Voice Path Signaling Path BSNL PSTN Network
After MNP: Voice and Signaling Logical Path for Fixed to Mobile Calls SDCA-B SDCA-A SDCA-C BSNL/Pvt. Operators CMSP Network SDCA-D Level-II TAX Local cum Tandem Exch. SSTP/LPDB LDCA Voice Path Signaling Path BSNL PSTN Network Note: The connectivity between local exchanges and SSTP may be established by creating NUC(Nailed Up Connections) at TAX.
Prerequisites • All Level-II to Level I C-7 Traffic already shifted to SSTP Network • All Level-II to Level II C-7 Traffic already shifted to SSTP Network • No CMTS POI at Local Exchanges
Issues in CDR Billing Project Post MNP, RN Information will be available only in L-II /L-I TAX s not in Local Exchanges. For implementing Deferential charging in Retail Billing RN information must be available in CDRs of Local Exchanges. One of the method is to take Fixed to Mobile calls CDRs from L-II TAX and use it for retail billing along with the CDRs generated at Local Exchanges The above method requires major changes in software and Hardware of Retail Billing Servers of CDR project.
Solution Finalized: One of the alternative method is to use Charge Band Number captured in CDRs of Local Exchanges, for determining the Intra and Inter operator call As the CHB number captured in the CDRs of Local Exchanges will be different in case tariff for intra BSNL and inter operator calls is different Though CHB No information is captured by all NT switches but not by C-DOT switches One Patch for capturing the CHB No in CDRs of C-DOT exchanges has been got developed This patch is to be loaded in all C-DOT exchanges before they come under CDR Billing Project For SSAs already under CRD project, necessary instructions are to be issued by IT Cell, CO/ITPC.
Responsibilities Monitoring of Implementation and to ensure completion of work as per schedule Co-ordination between Wire line and Mobile Group Interaction with HO Holding Internal Meetings with SSA and finalization of plan Loading of C-DOT patch based on CDR Billing Rollout Plan
IMPLEMENTATION OF MNP IN BSNL WIRE LINE NETWORK • All PSTN switches in all Circles are also required to be complaint with MNP regime for Fixed to Mobile Calls. • In first Phase MNP is to be implemented in 4 metros and all 5 “A” category LSAs – 9 LSAs in total. In second phase – “B” and “C” category Circles. Deadline: 31. 03. 2010. “IAM Relay” method is used for implementing MNP in BSNL. The Scope of MNP implementation in Wire Line PSTN network covers following network elements/platforms: a) Wire Line Switches for handling Fixed to Mobile Calls. b) Wire Line ILD Switches for handling Fixed to Mobile incoming ISD calls. c) Wire Line IN platform for handling Fixed to Mobile call for various IN Services e. g. VCC, FPH, FLPP etc. • •
NOTE ON IAM RELAY METHOD • In IAM Relay method SSTP must intercept all IAMs for fixed to mobile calls originating from local exchanges and prefix the RN number with B party number in the IAM before sending the same to Level-I/II Taxs/Tandems. • This RN+B number information used by Level I/II Taxs/Tandems to route the call to correct service provider. • Necessary creation of routing and charging information is required to be done at Level I/II Taxs. • This method requires connecting all the local exchanges with SSTP. • Since availability of limited ports in SSTP network and large number of local exchanges in BSNL networks, hence it has been decided only few new technology local exchanges
For ISD Incoming Calls to be terminated on Mobile Network. • All ILD Gateways route their traffic to respective L 1 Tax's via SSTP only. • IAM of such calls will be relayed by SSTP after prefixing the appropriate RN+B number. • Calls with RN+B will be analyzed by L 1 Tax's and will be routed to respective MSCs.
For handling Fixed to Mobile Calls for various IN Services e. g. VCC, FPH, FLPP etc. • For handling prepaid IN calls like VCC, FLPP, ACC , FLPP etc, SSP functionality of only local exchanges can be used so that only IAM is intercepted before calls enter into the Lev II/Tandems having POI connectivity. • Hence all field units should ensure local exchanges connecting to SSTP are upgraded for SSP functionality. • Implementing MNP in Postpaid IN Services such as FPH, UAN, VPN etc, mapped number in SCP is to be defined with RN+B (in case translated number is mobile). • In few cases (where all local switches are CDOT technology) which can’t be used for SSP functionality and only SSP functionality of LEV II tax is available then all intra circle Fixed to Mobile-IN Prepaid traffic may be routed to respective Lev I Tax. • Necessary re-dimensioning of Poi's at Lev I Tax to be taken care off.
VCC(VIRTUAL CALLING CARD) Origination customer has to be BSNL / MTNL only. Termination can be any operator customer. Customer dials 1802 -425. SCP will play announcement to dial the card no. Once the 15 digit card no is entered and verified , announcement is played to dial the destination No. Destination no dialed is 9449828818 which is a ported no in NPDB. CIC | | • SSP ------ SCP----- SSP ------ Tandem------ SSTP----- TAX--- MSC 1802 -425 -15 digit Card no. C-9449828818 55559449828818 (In PREA 15 TRAD 6, PRE = C 944982 RCE=2) Analysis 944982 to opened in TRAD 6 And routed to TAX with PTX=0 and FITX To be given towards TAX ACH (new).
FPH (Free Phone Call) Requirement. Originating customer can be any operator. Terminating customer is only BSNL/MTNL RN Value for BSNL – 5555 RN Value for MTNL – 4444 SSP ------ SCP Customer dials 1800 -425 -2222 SCP ------ SSP This 2222 is mapped to C-5555 -9449828818 at SCP and forwarded to SSP will strip off C and forward rest of the digit to Tandem. __________CIC_____________ | | SSP ------ Tandem ------- SSTP------ TAX IAM (Called No-55559449828818) |--------------Signaling-----------------| SSP -------------------- SSTP ------- TAX ------- MSC IAM (Called No - 55559449828818) Now SSTP should be transparent to forward the same to the TAX, since RN is already prefixed by SCP.
UAN call within Local Exchange Fixed Charging In this scenario Customer dials Service access code 1860425+ 4 digit code (Code can be 0000 to 4999 any number). This 4 digit code is mapped with a mobile number with RN prefixed, Eg - 55559449828818. When customer dials the access code in return SCP returns C+RN+DN (C 55559449828818) to SSP with charge band. SSP -------------> SCP 18604252222 SSP ------------- SCP C 55559449828818 + Charge Band Calling party is charged 30 sec pulse. Called party is not charged.
Split Charging In this scenario Customer dials Service access code 1860425+ 4 digit code (Code can be 5000 to 9999 any number). This 4 digit code is mapped with a mobile number with RN prefixed, Eg 55559449828818. When customer dials the access code in return SCP returns C+RN+DN (C 55559449828818) to SSP with charge band. SSP -------------> SCP 18604252222 SSP ----------- SCP C 55559449828818 + Charge Band Calling party is charged 180 sec pulse. Called party is charged as per STD charges
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