KR100778640B1 - System and method for number potability service in each generation - Google Patents

Abstract

An inter-generation number portability service system and a method thereof are provided to enable call processing for an inter-generation number portability called subscriber in an identical mobile service provider by additionally transmitting NPFI(Number Portability Forward Information) in making a location information inquiry request to an HLR(Home Location Register) so that location information interrogation can be normally executed even in a ported-out state for a specific called subscriber. An inter-generation number portability service system comprises an originating MSC(200), an originating CGS(300), an NPDB(Number Portability Database)(400), a serving CGS(500), and a serving HLR(600). The originating MSC(200) translates a CPN(Called Party Number) according to a call request from a calling terminal(100) for an inter-generation number portability called subscriber, and transmits the first ISUP_IAM message to the originating CGS(300). The originating CGS(300) forwards the first ISUP_IAM message and the second ISUP_IAM message containing the NPFI of the called subscriber to the serving CGS(500). The NPDB(400) provides the routing information of the called subscriber according to a request from the originating CGS(300). The serving CGS(500) makes a location information inquiry request for the called subscriber by transmitting the first and second ISUP_IAM messages to the serving HLR(600). Based on the first and second ISUP_IAM messages received from the serving CGS(500), the serving HLR(600) obtains the location information of the called subscriber.

Description

Generation number portability service system and its method {SYSTEM AND METHOD FOR NUMBER POTABILITY SERVICE IN EACH GENERATION}

The following drawings, which are attached in this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is a schematic structural diagram of an inter-generation number portability service system according to an embodiment of the present invention;

Figure 2 is a flow chart for explaining the intergenerational number portability service method according to the present invention when the destination network and the destination network is different.

3 is a flow chart for explaining the inter-generation number portability service method according to the present invention when the original destination network and the final destination network are the same.

4 is a flow chart for explaining the intergenerational number portability service method according to the present invention when the source network, the destination network, and the destination network are the same.

Explanation of symbols on the main parts of the drawings

100: originating terminal 200: originating exchange (MSC)

300: calling gateway gateway (CGS)

400: Number Potability Database (NPDB)

500: called gateway (CGS) 600: called home location register (HLR)

The present invention relates to an intergenerational number portability service system and a method thereof, and more particularly, to an existing service provider when applying a number portability service between a 2nd generation mobile communication system (2G) and a 3rd generation mobile communication system (3G). An intergenerational number portability service system that performs call processing via a number portability database (NPDB) like a number portability service, and classifies mobile operators and generations based on routing information (RN) It is about a method.

Number portability service refers to a service that allows a subscriber to continue to use the original telephone station number without any change even if the subscriber has changed his / her carrier, region, or service.

In the example of number portability service, if subscriber (A) cancels subscription to carrier A and newly subscribes to carrier B, subscriber A continues to use the telephone number previously assigned to subscriber A by subscriber A. Say a service to help. Number portability service can continue to use the service using the same telephone number even if the subscriber changes the subscriber telephone station within the same area code.

Meanwhile, as the modern society develops, mobile communication systems are also undergoing rapid technological development, and mobile communication services are also provided in various ways according to the rapid technological development of mobile communication systems. Thus, in order to provide a variety of mobile communication services, instead of changing the existing mobile communication method into a new mobile communication at a moment, when the new mobile communication method is used, the new mobile communication method is initially limited to a pilot operation form. It operates only in pilot networks (confined areas replaced with mobile communication system equipment supporting new mobile communication methods).

In this regard, the number portability service described above is not applied only when the communication service provider changes, but as described above, when changing the mobile communication method currently used by the subscriber, that is, the second generation mobile communication method (2G), for example, CDMA. (Code Division Multiple Access) and 3G mobile communication scheme (3G), for example, may be applied to the case where the Wide Code Division Multiple Access (WCDMA) is mixed.

Therefore, as described above, when the number portability service between the 2G mobile communication system (2G) and the 3G mobile communication system (3G) is applied, generation information of the called network in the calling network, that is, information on a carrier and generation classification The acquisition method is required.

The present invention was created to solve the problems inherent in the prior art as described above, and an object of the present invention is to establish a number portability database (NPDB) in the same way as a number portability service between existing service providers. The present invention provides an intergenerational number portability service system and a method for distinguishing between a mobile communication service provider and a household by performing a call processing.

In order to achieve the above object, according to an aspect of the present invention, there is provided an intergenerational number portability service system: the system according to a call request for an intergenerational number ported destination subscriber received from an originating terminal. A source exchanger (MSC) for translating a Called Party Number (CPN) to deliver a first request message (ISUP_IAM) to a source gateway exchange (CGS); A called party's gateway comprising a first call request message delivered from the calling exchange and a second call request message (ISUP_IAM) including the number portability forward information (NPFI) of the inter-generational numbered called party. A calling gateway gateway (CGS) to the switching center; A number portability database (NPDB) for providing routing information (RN, Routing Information) of the inter-generational numbered destination subscribers at the request of the calling gateway; A called-side gateway exchange station for transmitting the first call request message and the second call request message received from the calling gateway gateway to a called-party home location register (HLR) to request the inquiry of the location information of the called subscriber; And a called party home location register (HLR) for inquiring the location information of the called subscriber according to the first call request message and the second call request message transmitted from the called party gateway.

In the above configuration, the originating gateway gateway receives a location information inquiry (Ported Out) message according to the inter-generational number movement of the called subscriber in response to the first call request message from the called party home location register. If so, a call establishment failure message (ISUP_RELEASE) is sent to the calling gateway.

In the above configuration, the originating gateway exchange station receives the call establishment failure message ISUP_RELEASE from the called party gateway exchange in response to the transmitted first call request message from the number portability database NPDB. Receives routing information of the called subscriber who has been inter-generated number, and generates and outputs the second call request message.

In the above configuration, the called party home location register inquires the location information of the called party through the first call request message received from the called party gateway, and when the called party is inter-generational numbered, Sets the ported out status.

In the above configuration, the called party home location register is a normal location when the second call request message is received in a state in which a location information inquiry failed according to the generation number movement of the called subscriber is set. Perform information query.

In the above configuration, the called party home location register queries the location information of the called party via the second call request message received from the called party gateway.

According to another aspect of the present invention, a home location register is provided: the home location register is configured to transmit the number information of the called party in a state in which a location information lookup failure (Ported Out) state according to the number movement of the called party is set. When a call request message ISUP_IAM including a parameter (NPFI, Number Portability Forward Information) is received, location information inquiry for the called party is performed.

In the above configuration, the home location register is a number portability forward information (NPFI, Number Portability Forward Information) of the called subscriber in a state in which the location information inquiry failed (Ported Out) according to the number movement of the called subscriber is set. If the call request message ISUP_IAM is not included, the location information lookup failed (Ported Out) state is maintained.

In the above configuration, the home location register registers the number portability forward information of the called subscriber in a state in which the location information inquiry failed due to the number movement of the called subscriber is not set. When the call request message ISUP_IAM is received, location information inquiry about the called party is performed.

In the above configuration, the number shift includes a number shift in accordance with a mobile carrier change and a mobile communication service type change.

In accordance with an aspect of the present invention, a method of number portability service is provided, comprising: a) a home location register (HLR) receiving a call request message (ISUP_IAM) for a called subscriber received from a gateway gateway; And b) determining, by the home location register, whether or not a number is moved to the specific called party and whether or not a number portability forward information (NPFI) is included in the call request message; It includes.

In the above configuration, step b) sets the location information inquiry (Ported Out) status when the called subscriber is in a number transfer state and the number request information parameter (NPFI) is not included in the call request message. Thus, the gateway exchange generates a call setup failure message ISUP_RELEASE.

In the above configuration, the step b), when the call request message includes a number movement information parameter (NPFI) in the state of the Port Information Out setting (Ported Out) setting according to the number of the specific destination subscriber, the Perform location information inquiry on the called party.

In the above configuration, in step b), when the call request message does not include a number transfer information parameter (NPFI) in the state of setting a location information inquiry (Ported Out) according to the number transfer of the specific called party, The location information setting for the called subscriber is maintained.

In the above configuration, step b) includes a number transfer information parameter (NPFI) included in the call request message in a state in which the location information inquiry failed due to the number transfer of the called subscriber is not set. If not, the location information inquiry for the called subscriber is performed.

In the above configuration, the number shift includes a number shift in accordance with a mobile carrier change and a mobile communication service type change.

According to yet another aspect of the present invention, there is provided a method for intergenerational number portability service: a) a calling party number, in response to a call request for a called subscriber received from an originating terminal, by an originating exchange. Parsing and forwarding the first call request message ISUP_IAM to the calling gateway gateway CGS; b) the originating gateway exchange forwards the first call request message to the first called gateway gateway based on the called number included in the first call request message and, in response, the call setup failure message ISUP_RELEASE. Determining whether to receive; c) when the call setup failure message is received from the first called party gateway, the calling party gateway exchanges routing information (RN, Routing Information) for the called party whose number is ported. Requesting and receiving a Potability Database; And d) a second called party corresponding to the routing information by the originating gateway switching station sending a second call request message (ISUP_IAM) including a number portability forward information (NPFI) parameter of the number ported called party. Delivering to the gateway exchange to perform call processing.

In the above configuration, the first and second destination side gateway exchange stations are located in the same mobile operator network to provide different mobile communication service methods.

In the above configuration, the first and second destination side gateway exchange stations are respectively located in different mobile communication operator networks.

(Example)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of an inter-generation number portability service system according to an embodiment of the present invention.

As shown in FIG. 1, the system translates a called party number (CPN) according to a call request for an inter-generational number-receiving called party received from the calling terminal 100, and the first call. An originating exchange (MSC) 200 which forwards a request message ISUP_IAM to the originating gateway switching center CGS, 300; The called party receives the second call request message (ISUP_IAM) including the first call request message transmitted from the calling exchange 100 and the number portability forward information (NPFI) of the inter-generational numbered called party. A calling gateway gateway 300 that transmits to a gateway gateway CGS 500; A number portability database (NPDB) for providing routing information (RN, Routing Information) of the inter-generational numbered destination subscribers at the request of the originating gateway gateway 300; The called party gateway requesting the inquiry of the location information of the called subscriber by transmitting the first call request message and the second call request message received from the calling gateway gateway 300 to the called party's home location register (HLR) 600. Switching center 500; And a called party home location register (HLR) 600 for inquiring about the location information of the called party according to the first call request message and the second call request message transmitted from the called gateway gateway 500. .

When the originating gateway gateway 300 receives a call setup failure message ISUP_RELEASE in response to the first call request message from the called gateway gateway 500, an intergenerational number from the number portability database NPDB. Receives the routing information of the called party, and generates and outputs the second call request message. Here, the number transfer information parameter (NPFI) included in the second call request message is used when the switch (MCS) and the gateway switching center (CGS) deliver the number transfer information for a specific called party to the home location register (HLR). do.

The called gateway gateway 500 receives a location information inquiry (Ported Out) message from the called party home location register 600 in response to the first call request message according to the intergenerational number movement of the called subscriber. If so, a call establishment failure message ISUP_RELEASE is transmitted to the originating gateway switching center 300.

The called party home location register 600 inquires the location information of the called party through the first call request message received from the called party gateway, and if the called party has been moved between generations, location information. Set the ported out status. In addition, the called party's home location register 600 is normally positioned when the call request message is received in a state in which the location information inquiry failed due to the number-to-generation number movement of the called subscriber. Perform information query. That is, the called party home location register 600 according to the present invention, in the location information inquiry failure state (Ported Out) according to the first call request, the number transfer information parameter (NPFI) according to the inter-generational number movement again. When the second call request message is received, normal incoming processing is performed. Meanwhile, the called party's home location register 600 according to the present invention does not include the number port information parameter (NPFI) in the location information inquiry failed state (Ported Out) according to the first call request. If the call request message is received according to the inter-number movement, the location information inquiry failed state (Ported Out) is maintained.

Hereinafter, an inter-generation number portability service method according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4. 2 to 4 are flowcharts for explaining an inter-generation number portability service method according to an embodiment of the present invention.

First, referring to FIG. 2, when the originating network 2G and the final destination network 3G are different, that is, intergenerational number portability according to the present invention in a state where the called subscriber moves from generation to generation to another mobile carrier. The service method is described as follows. For reference, the number portability service method described below with reference to FIG. 2 is the same as the number portability service method of the known QoR processing method.

First, when the calling terminal A requests a call processing for a called terminal whose number has been shifted from one generation to another mobile communication provider (S110), the switch MSC_1 of the calling network receives a called number (CPN, Called) of the called terminal. Party number) and transmits the first call request message ISUP_IAM including the same to the gateway switching center CGS_1 of the calling network (S120).

Thereafter, the gateway switching center CGS_1 of the calling network transmits the first call request message to the gateway switching center CGS_2 of the original recipient network based on the called number included in the first call request message (S130).

Then, the gateway switching center CGS_2 of the original destination network requests (LOCREQ) the home location register HLR_2 to query the location information of the called terminal B (S140).

The home location register (HLR_2) receiving this, checks the generation number transfer status of the called terminal (B) through the query of the subscriber routing table for the called number, and sets the location information inquiry (Ported Out) state, The message (locreq) is transmitted to the gateway switching center (CGS_2) of the destination network (S150).

Next, the gateway switching center CGS_2 of the originating network forwards the call setup failure message ISUP_RELEASE to the gateway switching center CGS_1 of the calling network (S160).

Upon receipt of the call establishment failure message ISUP_RELEASE, the gateway switching center CGS_1 of the calling network transmits routing information (RN, Routing Information) for the called subscriber to which the calling gateway is numbered. Request (NPREQ) and receive (npreq) to the Number Potability Database (S170-S180).

Then, the gateway switching center CGS_1 of the calling network transmits the second call request message ISUP_IAM including the number portability forward information (NPFI) parameter of the inter-generationally numbered destination terminal (B). Transfer to the gateway switching center (CGS_3) of the final destination corresponding to (S190).

Thereafter, the gateway switching center CGS_3 of the destination network requests the home location register HLR_3 to query the location information of the destination terminal B (LOCREQ) (S200), and receives the home location register HLR_3, The location information of the called terminal B is queried through the inquiry of the subscriber routing table for the called number, and the location information locreq of the corresponding exchange MSC_3 is transmitted to the gateway switching center CGS_3 of the destination network (S210). .

Then, the gateway switching center (CGS) of the destination network transmits the second call request message (ISUP_IAM) to the corresponding exchange (MSC_3), thereby performing call establishment with the destination terminal (B) through the relay of the switching center (MSC_3). (S220-S230).

Next, referring to FIG. 3, when the originating network 2G and the final terminating network 3G are the same, that is, the inter-generational number portability service according to the present invention in the state in which the called subscriber is ported in the same mobile service provider. The method is as follows.

First, when the calling terminal A requests a call processing for a called terminal whose number has been moved between generations within the same mobile communication provider (S110), the switch MSC_1 of the calling network receives a called number (CPN) of the called terminal. Called Party Number) is analyzed and the first request message ISUP_IAM including the same is transmitted to the gateway switching center CGS_1 of the calling network (S120).

Thereafter, the gateway switching center CGS_1 of the calling network transmits the first call request message to the gateway switching center CGS_2 of the called network based on the called number included in the first call request message (S130).

Then, the gateway switching center CGS_2 of the called network requests the home location register HLR_2 to query the location information of the called terminal B (LOCREQ) (S140).

The home location register (HLR_2) receiving this, checks the generation number transfer status of the called terminal (B) through the query of the subscriber routing table for the called number, and sets the location information inquiry (Ported Out) state, The message (locreq) is transmitted to the gateway switching center (CGS_2) of the destination network (S150).

Next, the gateway switching center CGS_2 of the originating network forwards the call setup failure message ISUP_RELEASE to the gateway switching center CGS_1 of the calling network (S160).

Upon receipt of the call establishment failure message ISUP_RELEASE, the gateway switching center CGS_1 of the calling network transmits routing information (RN, Routing Information) for the called subscriber to which the calling gateway is numbered. Request (NPREQ) and receive (npreq) to the Number Potability Database (S170-S180).

Then, the gateway switching center CGS_1 of the originating network receives the second call request message (ISUP_IAM) including the number portability forward information (NPFI) parameter of the called terminal B, which has been inter-numbered to the same mobile operator. ) Is transmitted to the gateway switching center (CGS_2) of the called network corresponding to the routing information (S190).

Subsequently, the gateway switching center CGS_2 of the called network requests the home location register HLR_2 to query the location information of the called terminal B (LOCREQ) (S200).

The home location register (HLR_2), which has received this, inquires the location information of the called terminal (B) through an inquiry of the subscriber routing table for the called number, and checks the location information (locreq) of the corresponding exchange (MSC_2) at the gateway of the called network. Transfer to the switching center (CGS_2) (S210).

Then, the gateway switching center CGS_2 of the called network transmits the second call request message ISUP_IAM to the corresponding exchange MSC_2 to perform call setup with the terminating terminal B through the relay of the switch MSC_2. (S220-S230).

Lastly, referring to FIG. 4, an inter-generation number portability service method according to the present invention when the calling network, the originating network 2G, and the final destination network 3G are the same will be described.

First, when the calling terminal A requests a call processing for a called terminal whose number has been moved between generations within the same mobile communication provider (S110), the switch MSC_1 of the calling network receives a called number (CPN) of the called terminal. Called Party Number) is analyzed, and the home location register (HLR_1) requests the location information inquiry of the called terminal B (LOCREQ) (S120).

The home location register (HLR_1) receiving this checks the inter-generational number transfer status of the called terminal (B) through an inquiry of the subscriber routing table for the called number, and sets the location information inquiry (Ported Out) state, The message (locreq) is transmitted to the exchange MSC_1 (S130).

Subsequently, the exchange MSC_1 of the originating network requests (RNREQ) and reception (npreq) from the number portability database (NPDB) for routing information (RN, Routing Information) for the called subscriber whose number is inter-generated. (S140-S150).

Then, the exchange MSC_1 of the calling network transmits the call through the second request message including the number portability forward information (NPFI) parameter of the called terminal B, which has been inter-numbered to the same mobile carrier. Request (LOCREQ) the location information inquiry of the called terminal B to the home location register HLR_1 (S160),

The home location register (HLR_2), which receives this, inquires the location information of the called terminal (B) through an inquiry of the subscriber routing table for the called number, and transmits the location information (locreq) of the corresponding exchange (MSC_2) to the switch of the calling network. Transfer to (MSC_1) (S170).

Then, the exchange MSC_1 of the originating network transmits the second call request message ISUP_IAM to the corresponding exchange MSC_2 to perform call setup with the destination terminal B through the relay of the switch MSC_2 ( S180-S190).

As can be seen from the above, the intergenerational number portability service system and method according to the present invention performs call processing via a number portability database (NPDB) in the same way as the existing number portability service between carriers. By performing this, intergenerational number portability service for segmenting mobile communication service providers and households is possible.

In particular, when a location information inquiry request is made to a corresponding home location register, the number of generation portability forward information (NPFI) is additionally transmitted, thereby enabling a normal location even in a state of setting ported out for a specific called party. As the information can be queried, call processing is possible for a called subscriber who has moved between generations within the same mobile service provider.

Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

Claims (19)

In response to a call request for an intergenerational number-transferring called party received from the calling terminal, the called party number (CPN) is translated and the first call request message (ISUP_IAM) is transmitted to the calling gateway gateway (CGS). An originating exchange (MSC); A called party's gateway comprising a first call request message delivered from the calling exchange and a second call request message (ISUP_IAM) including the number portability forward information (NPFI) of the inter-generational numbered called party. A calling gateway gateway (CGS) to the switching center; A number portability database (NPDB) for providing routing information (RN, Routing Information) of the inter-generational numbered destination subscribers at the request of the calling gateway; A called-side gateway exchange station for transmitting the first call request message and the second call request message received from the calling gateway gateway to a called-party home location register (HLR) to request the inquiry of the location information of the called subscriber; And Inter-generational number comprising: a called party home location register (HLR) for inquiring the location information of the called subscriber according to the first call request message and the second call request message transmitted from the called party gateway. Mobility Service System. 2. The destination gateway gateway of claim 1, In response to the first call request message from the called party's home location register, a call setup failure message (ISUP_RELEASE) is received when receiving a location information inquiry (Ported Out) message according to the generation number generation of the called subscriber. Intergenerational number portability service system, characterized in that the transmission to the calling gateway gateway. 3. The system of claim 2, wherein the originating gateway gateway is: When the call setup failure message ISUP_RELEASE is received from the called gateway gateway in response to the transmitted first call request message, routing information of the called subscriber who has been inter-generationally transferred from the number portability database NPDB is received. Inter-generation number portability service system, characterized in that for receiving and generating and outputting the second call request message. According to claim 1, wherein the called party home location register, Inquiring the location information of the called subscriber through the first call request message received from the called gateway gateway, and setting the location information inquiry (Ported Out) status when the called subscriber is moved between generations. An intergenerational number portability service system. The called-side home location register according to claim 1 or 4, Intergenerational number, characterized in that the normal position information query is performed when the second call request message is received in the state that the location information inquiry failure (Ported Out) state according to the intergenerational number movement of the called subscriber is set Mobility Service System. According to claim 1, wherein the called party home location register, And interrogation location information of the called subscriber through the second call request message received from the called gateway. A call request message (ISUP_IAM) including the number portability forward information (NPFI) of the called subscriber may be received when the location information inquiry failed due to the number transfer of the called subscriber is set. If the home location register (HLR) characterized in that for performing the location information query for the called subscriber. The method of claim 7, wherein the home location register, Call request message (ISUP_IAM) that does not include Number Portability Forward Information (NPFI, Number Portability Forward Information) of the called subscriber in the state where the Ported Out status is set according to the number transfer of the called subscriber. When receiving, Home location register, characterized in that to maintain the Ported Out status information (Ported Out) status. The method of claim 7, wherein the home location register, A call request message (ISUP_IAM) including the number portability forward information of the called subscriber is received in a state where the ported out status is not set according to the number shift of the called subscriber. If so, the home location register, characterized in that for performing the location information query for the called subscriber. The method according to any one of claims 7 to 9, wherein the number shifting is A home location register, characterized in that it comprises a number shift in accordance with the mobile carrier change and the mobile communication method change. a) the home location register (HLR) receiving a call request message (ISUP_IAM) for the called party received from the gateway switching center; And b) determining, by the home location register, whether or not to execute location information inquiry by determining whether the port number for the specific called party is included and whether or not a number portability forward information (NPFI) is included in the call request message. ;; The number portability, the generation number portability service method, characterized in that it comprises a number shift in accordance with the mobile communication provider change and the mobile communication method change. The method of claim 11, wherein b), If the called party is in the number transfer state and the call request message does not include the number transfer information parameter (NPFI), the location information inquiry failed indicating the state where the home location register does not execute the position information inquiry (Ported Out). Set the status to cause the gateway switching center to generate a call setup failure message (ISUP_RELEASE). The method of claim 11, wherein b), When the call request message includes a port number information information parameter (NPFI) in a state of setting ported out according to the number transfer of the specific called party, performing the position information inquiry on the called party Intergenerational number portability service method, characterized in that. The method of claim 11, wherein b), In the case of the Ported Out setting of location information according to the number transfer of the specific called party, when the number request information parameter (NPFI) is not included in the call request message, the location information inquiry failed for the called party ( Ported Out) intergenerational number portability service method characterized by maintaining the set state. The method of claim 11, wherein b), If the Port Request Status (Ported Out) state of the called party's number movement is not set, and the call request message does not include the Number Port Information Parameter (NPFI), the position of the called party. An intergenerational number portability service method, characterized by performing information inquiry. delete a) The calling exchange analyzes the Called Party Number according to the call request for the called subscriber received from the calling terminal, and transmits the first request message (ISUP_IAM) including the calling party gateway (CGS). Delivering to; b) the originating gateway switch forwards the first call request message to the first called gateway gateway based on the called number included in the first call request message, and in response, a call setup failure message (ISUP_RELEASE). Determining whether to receive; c) when the call setup failure message is received from the first called party gateway, the calling party gateway exchanges routing information (RN, Routing Information) for the called party whose number is ported. Requesting and receiving a Potability Database; And d) the calling party gateway exchanges the second called party gateway corresponding to the routing information with a second request message (ISUP_IAM) including a number portability forward information (NPFI) parameter of the number ported called party. Performing call processing by forwarding to the switching center. 18. The system of claim 17, wherein the first and second destination side gateway offices are: An intergenerational number portability service method, which is located in the same mobile service provider network and provides different mobile communication methods. 18. The system of claim 17, wherein the first and second destination side gateway offices are: Intergenerational number portability service method, characterized in that located in different mobile communication provider networks.

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