WO2000016583A1 - Procede pour la portabilite de numero dans un reseau de telecommunication - Google Patents
Procede pour la portabilite de numero dans un reseau de telecommunication Download PDFInfo
- Publication number
- WO2000016583A1 WO2000016583A1 PCT/US1999/017410 US9917410W WO0016583A1 WO 2000016583 A1 WO2000016583 A1 WO 2000016583A1 US 9917410 W US9917410 W US 9917410W WO 0016583 A1 WO0016583 A1 WO 0016583A1
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- WO
- WIPO (PCT)
- Prior art keywords
- field
- call
- mobile station
- ported
- routing
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
- H04W8/28—Number portability ; Network address portability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
- H04Q3/0029—Provisions for intelligent networking
- H04Q3/005—Personal communication services, e.g. provisions for portability of subscriber numbers
Definitions
- This invention relates in general to telecommunication networks, and more particularly to a method for providing number portability in a telecommunications network.
- LNP Local number portability
- NP Number portability
- DN directory number
- Service provider portability is intended to give subscribers the ability to choose to obtain local telephone services from any service provider while retaining the same telephone number.
- Location portability permits subscribers to retain the same telephone number after moving to a new location, even if the new location is outside the servicing area of the current serving end office.
- service portability allows subscribers to obtain any type of telecommunications services while retaining the same telephone number, regardless of the capabilities of the current serving end office.
- GSM global system for mobile communications
- SIM subscriber identity module
- PIN personal identification number
- GSM Global System for mobile communications
- BSS base station subsystem
- BTS base transceiver station
- BSC base station controller
- a home location register stores the identity and user data of all subscribers belonging to the area of the related GMSC. These are permanent data such as the international mobile subscriber identity (IMSI) of an individual user, the user's phone number from the public network, which is not the same as the IMSI, the authentication key, the subscriber's permitted supplementary services and some temporary data.
- IMSI international mobile subscriber identity
- Temporary data on the SIM include such entries as the address of the current visitor location register (VLR), which currently administers the mobile station, the number to which the calls must be forwarded, if the subscriber selects call forwarding, and some transient parameters for authentication and ciphering.
- VLR visitor location register
- the IMSI is permanently stored on the SIM card.
- the IMSI is one of the pieces of important information used to identify a subscriber within the GSM system.
- the first three digits of the IMSI identify the mobile country code (MCC) and the next two digits are the mobile network code (MNC).
- MCC mobile country code
- MNC mobile network code
- MSIC mobile subscriber identification number
- 262 02 454 555 5555 identifies a subscriber from Germany, who is paying a private operator having a MNC of 02.
- the subscriber's network identity number (MSIC) is 454 555 5555.
- the number with which the subscriber may be reached from the public network is different form the IMSI. This number is the mobile subscriber ISDN number (MSISDN).
- the MSISDN starts with an area code followed by a seven digit subscriber number. The first digits of this subscriber number identify the subscriber's related HLR.
- the PSTN routes a call to the mobile subscriber based on the MSISDN via the GMSC.
- the GMSC based on its internal tables, correlates the MSISDN to the specific HLR, which has to be queried to get subscriber information.
- the HLR replies with specific information about the identity of the MSC where the subscriber is currently located and essentially provides a number where the subscriber can be reached. This is know as the mobile station roaming number (MSRN).
- MSRN mobile station roaming number
- a subscriber's directory number is usually a geographic number.
- the subscriber's directory number under the North American Numbering Plan (NANP) is in the NPA-NXX-XXXX format, where NPA is the Numbering Plan Area code, NXX is the central office Code, and XXXX identifies the station umber.
- NPA North American Numbering Plan
- NXX is the Numbering Plan Area code
- XXXX identifies the station umber.
- the geographic number uniquely identifies both the subscriber and the physical location of the subscriber's terminal.
- MSIDSN numbers are pre-assigned to each HLR, and therefore a relocating mobile subscriber must be assigned a new MSISDN number within the series pre-assigned to the second HLR. Changing the assigned MSISDN number is a cumbersome process in part because the mobile subscriber has to have the mobile terminal serviced to change the MSISDN. Furthermore, the mobile subscriber must also notify all appropriate parties of the new MSISDN number.
- the number portability databases include a network address representing the end office currently serving the terminal. Call processing involving calls to portable numbers require additional routing information that is stored in these external number portability databases.
- the routing information is normally gathered by sending a query to the number portability database with a predefined protocol.
- MAP mobile application part
- Non-call-associated signaling implies all signaling dealing with mobility management, security, activation/deactivation of supplementary services and so on.
- MAP defines the operations between the MSC and the telephone network as well as the MSC, the HLR, and the VLR.
- MAP is an extension to the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) Signaling System Number 7 (SS7).
- ITU-T International Telecommunication Union-Telecommunication Standardization Sector
- SS7 Signaling System Number 7
- Proposals have been presented for using the GSM MAP_SRI (mobile application part send routing information) for querying the number portability database.
- these methods require changes to the MAP protocol. For example, a special number portability flag is needed to indicate whether the number is ported or not. It can be seen that there is a need for a method that provides number portability database queries without modifications to the MAP protocol.
- the present invention solves the above-described problems by providing a method for providing a number portability database query using existing fields.
- a method in accordance with the principles of the present invention includes receiving a call, determining how to route the call by looking at an identity information field and determining whether the call is ported or non-ported by analyzing the identity information field.
- the method further includes providing routing information associated with the call, the routing information including the identity information field, the identity information field further including a mobile station roaming number field and an international mobile subscriber identity field.
- the determining how to route the call further includes determining how to route the call by looking at a mobile station roaming number field in the information identity field.
- the determining whether the call is ported or non-ported further includes determining whether the call is ported or non-ported by analyzing an international mobile subscriber identity field in the information identity field.
- an international mobile subscriber identity field in the information identity field.
- other fields other than the international mobile subscriber identity field may be used to indicate whether the number is ported or non-ported, e.g., the mobile station roaming number field.
- Fig. 1 illustrates the functional architecture to support service provider number portability according to the present invention
- Fig. 2 illustrates the logical architecture of the public land mobile network
- Fig. 3 illustrates the a protocol stack used in communication between networks in a communication system
- Fig. 4 illustrates the interrogation of the NP Database and the HLR Simultaneous Call Flows
- Fig. 5 illustrates the Normal GTT for SRI Messages according to the present invention
- Fig. 6 illustrates the signaling for call origination to a non-ported number in a non-PLMN/Ported NPA-NXX range
- Fig. 7 illustrates the signaling when call origination is made to a ported number in a non-PLMN/ported NPA-NXX range
- Fig. 8 illustrates the signaling for a call origination to a non-ported number in a PLMN/ported NPA-NXX range
- Fig. 9 illustrates the signaling for a call origination to a ported number in a PLMN/ported NPA-NXX range.
- the present invention provides a method for providing number portability in a telecommunications network.
- Number portability is implemented according to a Location Routing Number (LRN) method.
- LRN Location Routing Number
- the number portability database Depending on whether the number is ported or not, the number portability database returns a MAP_SRI_ack message that provides number portability information. If the number is ported, the number portability database returns the MAP_SRI_ack back to the MSC with the number portability information carried in the MSRN and IMSI fields.
- the MSRN is the number portability routing information, i.e., the LRN in ANSI
- the IMSI is the first prefix and a filler.
- the filler may be arbitrarily selected or may be used to carry the MSISDN received from the original MAP SRI.
- the MAP_SRI_ack returns to the MSC the MSRN and IMSI fields with the MSRN field containing the MSISDN received form the original MAP_SRI and with the IMSI field containing a second prefix and a filler.
- the filler may be arbitrarily selected.
- the MSC uses the number stored in the MSRN to determine how to route the call and uses the prefix to determine whether the call is toward the ported number of not. If not ported, the signaling required for ported number shall apply.
- the ported status can be determined by the prefix used in the IMSI. However, those skilled in the art will recognize that other fields other than the international mobile subscriber identity field may be used to indicate whether the number is ported or non-ported, e.g., the mobile station roaming number field.
- Fig. 1 illustrates the functional architecture 100 to support service provider number portability according to the present invention.
- mobile terminals 110, 112 communicate via MSCs 114, 116, through the public switched telephone network (PSTN) 120.
- PSTN public switched telephone network
- the MSCs 114, 116, and PSTN 120 have access to Signaling Transfer Points (STP) 122, 124.
- STPs 122, 124 are programmed controlled packet data switching systems. In operation, an STP will receive a packet data message from another node of the network, e.g., one of the MSCs 114, 116.
- the STPs 122, 124 analyze point code information in packets and route the packets according to a translation table stored within the STP 122, 124.
- the STPs 122, 124 provide the Signaling Connection Control Part (SCCP) functions such as Global Title Translation (GTT) and SCCP management. GTT is used for message delivery (e.g., queries) to application databases. SCCP management is used to manage and reroute traffic based on application availability.
- SCCP Signaling Connection Control Part
- a Home Location Register (HLR) 130 maintains information for the management of mobile subscribers 110, 112. HLR 130 contains the subscription information and may contain the location of each mobile station 110, 112.
- the NP database 132 is the database accessed in real time by the MSCs 114, 116 to provide the LRN for a ported subscriber in order to correctly route a call.
- the NP database 132 contains the number portability information transmitted by the number portability administration center service management system (NPAC-SMS) 140 via the Local Service Management System (LSMS) 142.
- the NPAC-SMS 140 is a Service Management System responsible for storing and broadcasting to the LSMS(s) 142 NP data updates within a service provider's area.
- the LSMS 142 is responsible for distributing the NP data updates from the NPAC-SMS 140 to the service provider's NP database 132.
- the MSCs 114, 116 perform all the switching functions for mobile stations. This includes the allocation of radio resources, call establishment and handover. MSs 110, 112 roaming the area of the MSCs 114, 116 are assigned to VLRs
- VLR 150, 152 are in charge of temporarily storing subscription data for the MSs 110, 112 registered in the area of MSCs 114, 116.
- a VLR may be collocated with an MSC, as shown in Fig. 1, or may be in charge of one or several MSC areas.
- Fig. 2 illustrates the logical architecture 200 of the public land mobile network (PLMN).
- PLMN public land mobile network
- the PLMN includes Equipment Identity Register (EIR) 210 that are used for handset authentication.
- Home Location Register (HLR) 212 are used for holding subscriber information and Authentication Centers (AUC) 214 are used to create security information for subscriber validation.
- a Short Message Service Center (SMSC) 216 is used for sending and receiving short messages.
- the MSC/VLR 220 hold visiting subscribers in order to perform call completion scenarios to and from the handset and the Gateway Mobile Switching Center (GMSC) 222 interface to the PSTN and allow mobile terminated call completion to be performed from PSTN.
- EIR Equipment Identity Register
- HLR Home Location Register
- AUC Authentication Centers
- GMSC Gateway Mobile Switching Center
- the SCCP Gateway (SG) 230 interfaces to the external SS7 networks and is used as a firewall for SCCP communication.
- the SCCP Relay (SR) 240 is used to perform complex Global-Title translations on the Calling and Called Party Addresses which cannot be distributed amongst remote network elements.
- NBSN 250 is used as an SCCP Gateway to North-American GSM Roaming Partner's PLMNs, and ISBN 252 is used as an SCCP Gateway to International GSM Roaming Partner's PLMNs.
- the SG and SR can reside on a standalone STP or on the GMSC/NLR.
- the SG and SR can reside on a standalone STP or on the GMSC/NLR.
- the call is routed to an MSC 222.
- This MSC 222 will interrogate the appropriate HLR 212 and then route the call to the MSC 220 where the mobile station is located.
- the MSC 222 which performs the interrogation and routing function to the actual location of the mobile is called the Gateway MSC (GMSC).
- GMSC Gateway MSC
- MSC Gateway MSC
- the network requires a 10-Digit GTT Node to be deployed within the PLMN 200.
- This is typically referred to as functionality of the SCCP Relay 240 and can reside on either the MSC/VLR Nodes, standalone STP Nodes, or a separate SCCP Relay Node.
- the SCCP Relay 240 is shown as a standalone platform to identify when the SCCP Relay Functionality is utilized within the PLMN 200.
- the location routing number identifies the recipient network to which the subscriber has ported and is used by all switches in the call path to route the call to the recipient network.
- the recipient network uses the location routing number and the called party number to complete the call to the end user.
- the switch that obtains the location routing number sends an indication in the forward call setup information that the NP status of the called party number has been determined, thus inhibiting subsequent queries at the succeeding switches/network.
- the call is routed using the called party number if the subscriber is not ported or error/time-out occurs.
- the location routing number will be used to route to at least one Gateway MSC (GMSC) 222 of the PLMN 200.
- GMSC Gateway MSC
- Multiple location routing numbers may be assigned to the same GMSC 222 or same set of GMSCs 222. All location routing numbers routed to a particular GMSC 222 are recognized by that GMSC 222.
- the number portability database 260 When the number portability database 260 receives the request for routing information from the MSC 220, the number portability database 260 extracts the MSISDN and determines whether the number is ported or not. If the number is ported, the number portability database 260 returns the acknowledgment back to the MSC 220 with the number portability information carried in the MSRN and IMSI fields.
- the MSRN is the number portability routing information, i.e., the location routing number in ANSI
- the IMSI is the first prefix and a filler.
- the filler may be arbitrarily selected or may be used to carry the MSISDN received from the original MAP_SRI.
- the acknowledgment returns to the MSC 220 the MSRN and IMSI fields with the MSRN field containing the MSISDN received form the original request for routing information and with the IMSI field containing a second prefix and a filler.
- the filler may be arbitrarily selected.
- the MSC 220 uses the number stored in the MSRN to determine how to route the call and uses the prefix to determine whether the call is toward the ported number of not. If not ported, the signaling required for ported number shall apply.
- the ported status can be determined by the prefix used in the IMSI. However, those skilled in the art will recognize that other fields other than the IMSI field may be used to indicate whether the number is ported or non-ported, e.g., the mobile station roaming number field.
- Fig. 3 illustrates the a protocol stack 300 used in communication between networks in a communication system.
- the same protocols should exist in each layer of two network elements if they wish to communicate with each other. This is called the principle of the peer-to-peer communications.
- the lowest level protocol is the Message Transfer Part (MTP) 310.
- MTP 310 is responsible for transferring messages through the signaling link, routing the signaling information to the proper PCM line, controlling and testing the signaling network.
- MTP 310 provides a physical interface to higher level protocols.
- the next layer is the SCCP 312, which provides different classes of services for the upper layers. From these service classes only two are used in GSM. Connection-oriented services provide means to establish a virtual connection between two network elements. In connectionless mode, SCCP 312 enables to transfer signaling messages through the network without exactly knowing the network structure. In this case no speech connection is set up (e.g. location update when roaming) and routing is performed by adding and analyzing a so called global title.
- the Transaction Capabilities Application Part (TCAP) 320 was designed for signaling between applications. On the one hand it provides a component handling facility which enables to operate the data units, through which two users communicate (e.g. commands and responses). On the other hand, through the transaction facility, TCAP 320 handles several connectionless SCCP 312 messages (components) as one context (dialogue) between two network elements and enables to maintain several simultaneous dialogues between two applications.
- the highest level protocol, the Mobile Application Part (MAP) 330 has functions related to mobile telephony such as call control, location updating, HLR inquiries, roaming number inquiries, short message service, handovers, subscriber administration, supplementary services and equipment identification. MAP 330 is important that these functions do not require the establishment of a speech connection during signaling.
- the MAP protocol 330 has various different versions depending on the network element to which it is applied. MAP-M, V, H and E are the MAP versions of the MSC, VLR, HLR and EIR respectively.
- Fig. 4 illustrates the interrogation of the NP Database and the HLR Simultaneous Call Flows 400.
- the call flows 400 in Fig. 4 pertain to number portability only. For example, the signaling from the HLR to the VLR currently serving the mobile subscriber (used to obtain the roaming number) is not shown. Originating call or incoming call 410 with called party number is received by the MSC 412. The MSC 412 detects that the called number has the following attributes and sends an SRI Message 414 using the Called Party Number :-
- the NPA-NXX is in a PLMN Range
- the NPA-NXX is within a Non-PLMN Range which has been marked as a Ported Range.
- the SCCP Relay Function 416 recognizes the 10-Digit
- GTT (with Translation Type assigned for MAP_SRI) and routes the SRI 418 to the HLR 420.
- the subscriber is currently active and a roaming number 422 is returned to the GMSC NLR 412 with a Roaming Number and IMSI number.
- the IMSI does not contain any prefix used to identify the response is from NP-SCP 424.
- the call is setup 425 using the roaming number 426.
- the SCCP Relay Function 416 does not recognize the 10 Digit GTT (with Translation Type assigned for MAP_SRI) and routes the SRI 432 to the NP-SCP 424.
- the NP-SCP database 424 returns a MAP_SRI_ack message 434.
- the RN 436 contains either the 10 digit location routing number for the called party number or the actual called party number.
- a first subset 438 of the second scenario 430 occurs when the NP-SCP returns the location routing number 440. If the NP-SCP 424 returns the location routing number, the NP-SCP 424 places a pre-defined prefix in the IMSI field to identify that the RN contains a location routing number.
- the MSC 412 detects this pre-defined prefix and establishes the call using the location routing number if the location routing number is not owned by the PLMN. Otherwise, the MSC 412 will release the call using normal call release procedures.
- a second subset 444 of the second scenario 430 occurs when the NP-SCP 424 returns a Called Party Number. If the NP-SCP database 424 returns the Called Party Number, the NP-SCP 424 places a pre-defined prefix in the IMSI field 442 to identify that the RN 436 contains a Called Party Number. The MSC 412 detects this pre-defined prefix and the PLMN is the donor network for the portable NPA-NXX, then the MSC 412 will release the call 446 using normal call release procedures. This is the case when the called number is portable but unallocated.
- a third subset 450 of the second scenario 430 occurs when the NP-SCP 424 returns a Called Party Number.
- the NP-SCP 424 places a pre-defined prefix in the IMSI field 442 to identify the RN 436 contains a Called Party Number.
- the MSC 412 detects this pre-defined prefix and the PLMN is not the donor network for the portable NPA- NXX, then the MSC 412 will setup the call using the called party number 452. This is the case when the called number is within a portable NPA-NXX range, but not ported and not served by this PLMN.
- Fig. 5 illustrates the Normal GTT for SRI Messages 500 according to the present invention.
- the SCCP signaling encountered for SCCP Messages which are routed through the SCCP Relay and the Global-Title Analysis exists within the SCCP Relay Node 510.
- a mobile originated or mobile terminated call is made and a SRI Message 512 is sent from the GMSC/NLR 514.
- the SCCP Message 516 Called Party Global-Title Address is analyzed and is then translated into a new GT Address destination and is forwarded to HLR 520.
- the SRI acknowledgment 518 is sent back to the GMSC NLR 514 within the Network.
- the Routing Information 522 is obtained from the HLR 520.
- Fig. 6 illustrates the signaling 600 for call origination to a non-ported number in a non-PLMN/Ported NPA-NXX range.
- the GMSC/NLR 614 determines the attributes for the dialed number requires P-SCP database query. For example, the GMSC/VLR 614 determines that the dialed number is not within a PLM ⁇ ⁇ PA- ⁇ XX and that the dialed number is associated with a Ported ⁇ PA- ⁇ XX number range.
- the SRI Message 612 is sent to the SCCP Relay Node 610 for Global-Title Analysis on the Called Party Address.
- the SRI response 618 is sent back with a pre-defined prefix set in the IMSI field 622 to identify the routing number containing the called number.
- the call is routed using MF or ISUP signaling. If the signaling is ISUP then the I AM parameters are populated according to the ANSI standards. For example, the called party number is the dialed number, the generic address parameter is empty and the forward call indicator bit M indicates that a number is translated.
- Fig. 7 illustrates the signaling 700 when call origination is made to a ported number in a non-PLMN/ported NPA-NXX range.
- the GMSC/NLR 714 determines the attributes for the dialed number requires ⁇ P-SCP database query. For example, the dialed number is determined to not be within a PLM ⁇ ⁇ PA- ⁇ XX and the dialed number is determined to be associated with a Ported ⁇ PA- ⁇ XX number range.
- the SRI Message 712 is sent to the SCCP Relay Node 710 for Global-Title Analysis on the Called party Address.
- NP-SCP 720 Global-Title Analysis is not available to route the call and therefore the Number Portability Application via NP-SCP 720 is SRI message 716 is invoked.
- the SRI response 718 is sent back a pre-defined prefix set in the IMSI field 722 to identify the routing number containing the location routing number. If the location routing number is not from the PLMN, then the call is routed using MF or ISUP signaling. If the signaling is ISUP, then IAM parameters will be populated according to the ANSI standards. For example, the called party number is the location routing number, the generic address parameter is the dialed number and a forward call indicator bit M indicates that the number translated
- Fig. 8 illustrates the signaling 800 for a call origination to a non-ported number in a PLMN/ported NPA-NXX range.
- the SCCP signaling 800 encountered for a dialed number requires a database lookup for a PLMN number.
- the call origination and dialed digits are received by the GMSC/NLR 814.
- the GMSC/NLR 814 determines the attributes for the dialed number, e.g., the dialed number is determined to be within a PLM ⁇ ⁇ PA- ⁇ XX.
- the SRI Message 812 is sent to the SCCP Relay Node 810 for Global-Title Analysis on the Called party Address.
- Fig. 9 illustrates the signaling 900 for a call origination to a ported number in a PLMN/ported NPA-NXX range.
- the SCCP signaling 900 encountered for a dialed number requires a database lookup for a PLMN number.
- the call origination and dialed digits are received by the GMSC/NLR 914.
- the GMSC/NLR 914 determines that the attributes of the dialed number, e.g., the dialed number is determined to be within a PLM ⁇ ⁇ PA- ⁇ XX.
- the SRI Message 912 is sent to the SCCP Relay Node 910 for Global-Title Analysis on the Called party Address. Global-Title Analysis is not available to route the call and therefore the Number Portability Application via NP-SCP 920 in SRI message 916 is invoked.
- the SRI response 918 is sent back with a pre-defined prefix set in the IMSI field 922 to identify the routing number containing the location routing number.
- the call is routed using MF or ISUP signaling. If the signaling is ISUP, then IAM parameters will be populated according to the ANSI standards. For example, the called party number is the location routing number, the generic address parameter is the dialed number and the forward call indicator bit M is the number translated.
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU52489/99A AU5248999A (en) | 1998-09-14 | 1999-07-30 | Method for providing number portability in a telecommunications network |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US15236898A | 1998-09-14 | 1998-09-14 | |
US09/152,368 | 1998-09-14 |
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WO2000016583A1 true WO2000016583A1 (fr) | 2000-03-23 |
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PCT/US1999/017410 WO2000016583A1 (fr) | 1998-09-14 | 1999-07-30 | Procede pour la portabilite de numero dans un reseau de telecommunication |
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