CN101656930B - Method, device and system for realizing number portability service - Google Patents

Abstract

The invention discloses a method, device and system for implementing number portability services. The method includes: receiving a location information request or a short message routing information request message sent by a switching device or a short message center, and sending a query to a number portability database A request message, wherein the query request message carries the called number to obtain the service network information currently subscribed by the called party; receives the network routing code returned by the number portability database according to the called number; The network routing code is sent to the switching device or short message center, so that the switching device or short message center performs call connection according to the network routing code. The number portability service realized by the embodiment of the present invention requires little modification to the network.

Description

Method, device and system for realizing number portability service

technical field

The present invention relates to the technical field of communication, in particular to a method, device and system for realizing a number portability service. the

Background technique

Mobile Number Portability (MNP, Mobile Number Portability) refers to allowing mobile users to change the contract network in the same country without changing the original mobile station ISDN number (MSISDN, Mobile Station ISDN Number), that is, the user has a permanent The mobile phone number (called a portable number), when the user moves to another contracted network, the original phone number can still be used, so the MNP service brings a lot of convenience to the mobile user. Based on the MNP service, after the user subscribes to another network with the original telephone number, the new contract network will assign a new International Mobile Station Identification Number (IMSI, International Mobile Subscriber Identification Number) to the incoming (Portedin) mobile user. This communication service is provided by the new contract network, and enjoys the same supplementary services and value-added services as other users under the new contract network, and these communication services will not be affected by the old contract network. the

The current MNP implementation scheme for MNP business:

The first scheme is to add equipment similar to the MNP signal relay function (MNP-SRF, MNP Signaling Relay Function) in the network, and place the equipment between the MSC/GMSC and the HLR. When the MSC/GMSC sends a request for sending routing information (SRI, Send Routing Information) to the HLR, the MNP-SRP will intercept the SRI or SRI response message, and query the number portability database (NPDB, Number Portability) according to the number information carried in the message Database), once it is found that the number has been ported out, it will return RN (Routing Number)+MSISDN (Mobile Station International ISDN Number) to MSC, where RN refers to the routing number (Routing Number), and MSC will The call is forwarded to the GMSC, and the GMSC forwards the call to the network that the mobile user currently subscribes to according to the RN information. the

The second solution is similar to the above-mentioned first solution in principle, but it is necessary to trigger the call for the number that has been ported out to the intelligent network (IN, Intelligent Network). After the intelligent network queries the NPDB, the Add RN before the mobile user's MSISDN number for connection. the

In the third scheme, the exchange query method, the originating MSC receives the origination message, and analyzes whether the called number (mobile subscriber directory number MDN number, MSISDN or public switched telephone network PSTN number) is a portable number, if the called number is a portable number, then send the number portability query request NPREQ message to the NPDB to get the number portability information of the called user, if the NPDB returns a failure or no response, the originating MSC cannot obtain the portability information of the called number from the NPDB, and will use the default Provincial routing mode, that is, select the trunk to make outgoing calls according to the called number. If the originating MSC obtains the routing number carried by the number from the NPDB, it will select the trunk group to establish a call according to the routing number carried by the number. the

The above-mentioned first solution needs to superimpose MNP-SRP equipment on the core network, while the second solution must have the cooperation of the intelligent network. The third solution requires the entire network to upgrade the software of the MSC equipment, and it is necessary to query the MSCs in different places across the local network. NPDB requires considerable adjustments to the data configuration and routing rules of the existing network, and when there are multiple NPDBs in a local network, it is necessary to let the MSCs of other local networks know which numbers should be queried in which NPDB, so that the network can be operated It is very complicated, and the transformation of the existing network is also very large. the

Contents of the invention

The invention provides a method, device and system for realizing the number portability service, so that the number portability service can be realized without a lot of modification on the existing network. the

In order to realize the object of the present invention, the embodiment of the present invention provides following technical scheme:

A method for implementing a number portability service, comprising:

The called original home location register receives the location information request or short message routing information request message sent by the switching device or the short message center, and the called original home location register sends a query request message to the number portability database, wherein the query The request message carries the called number to obtain the service network information of the called party currently subscribed;

The original home location of the called party registers and receives the network routing code returned by the number portability database according to the called number;

The original home location registration of the called party sends the network routing code to the switching device or short message center, so that the switching device or short message center performs call connection according to the network routing code. the

A method for implementing a number portability service, comprising:

Receive the location information request response or short message routing information request response message returned by the original home location register of the called party, wherein the response message carries the information of the number portability database;

According to the information of the number portability database, send a query request message to the number portability database, wherein the query request message carries the called number to obtain the service network information that the called party currently subscribes to;

receiving the network routing code returned by the number portability database according to the called number;

The call is connected according to the network routing code. the

A method for implementing a number portability service, comprising:

The short message center sends a query request message to the number portability database according to the number portability database information configured by itself, wherein the query request message carries the called number to obtain the service network information of the called party currently subscribed;

The short message center receives the network routing code returned by the number portability database according to the called number;

The short message center performs call connection according to the network routing code. the

A home location register, comprising:

The trigger unit is used to trigger the query unit when receiving the location information request or the short message routing information request message sent by the switching device or the short message center;

The query unit is configured to send a query request message to the number portability database, where the query request message carries the called number to obtain the service network information currently subscribed by the called party, and receive the number portability database according to The network routing code returned by the called number;

a sending unit, configured to send the network routing code obtained by the query unit to the switching device or short message center through a location information response message or a routing information request response message, so that the switching device or short message center The above network routing code is used for call connection. the

A system for implementing a number portability service, comprising:

The original home location register of the called party is used to receive the location information request or the short message routing information request message sent by the switching device or the short message center, and send a query request message to the number portability database, wherein the query request message carries the called The called number is used to obtain the service network information of the called party currently subscribed, and to receive the network routing code returned by the number portability database according to the called number, and pass the obtained network routing code through the location information The request response or the short message routing information request response message is sent to the switching device or the short message center, so that the switching device or the short message center performs call connection according to the network routing code;

The number portability database is configured to receive a query request message sent by the original home location register of the called party, obtain the network routing code according to the called number in the query request message, and return it to the called party Called origin home location register. the

A system for implementing a number portability service, comprising:

The original home location register of the called party is used to receive the location information or short message routing information request message sent by the switching device or the short message center, and return the location information or routing information request response message carrying the information of the number portability database;

The switching device or the short message center is configured to send a query request message to the number portability database according to the information of the number portability database, wherein the query request message carries the called number to obtain the number portability database. Describe the service network information currently signed by the called party, receive the network routing code returned by the number portability database according to the called number, and perform call connection according to the network routing code;

The number portability database is used to receive the query request message sent by the switching device or the short message center, obtain the network routing code according to the called number in the query request message, and return it to the switching device or short message center. the

A system for implementing a number portability service, comprising:

The short message center is configured to send a query request message to the number portability database according to the number portability database information configured by itself, wherein the query request message carries the called number to obtain the service network currently subscribed by the called party information, receiving the network routing code returned by the number portability database according to the called number, and performing call connection according to the network routing code;

The number portability database is configured to receive the query request message sent by the short message center, obtain the network routing code according to the called number in the query request message, and return it to the short message center. the

In the method provided by the embodiment of the present invention, the number portability service is realized by querying the information of the called party's current subscription service network through the NPDB. The transformation of the short message center has little impact on the network organization structure of the existing network. the

Description of drawings

Fig. 1 is the schematic flow sheet of method embodiment one of the present invention;

Fig. 2 is the schematic flow sheet of the second embodiment of the method of the present invention;

Fig. 3 is the schematic flow sheet of the third embodiment of the method of the present invention;

Fig. 4 is the schematic flow sheet of the fourth embodiment of the method of the present invention;

Fig. 5 is the composition block diagram of device embodiment of the present invention;

Fig. 6 is the composition block diagram of system embodiment one of the present invention;

Fig. 7 is the composition block diagram of the second embodiment of the system of the present invention;

Fig. 8 is a composition block diagram of the third embodiment of the system of the present invention. the

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and the embodiments.

The embodiment of the present invention proposes a more independent and flexible solution for implementing MNP services, so that operators can better develop MNP services. the

Embodiment 1 of the present invention, as shown in Figure 1, the process of implementing the number portability service in this embodiment includes:

Step 101: the calling user initiates a call to the called user, wherein the number of the called user is the number of the network;

Step 102: After receiving the call request, the originating mobile switching center MSC or gateway MSC sends a location information request message LOCREQ to the called original home location register HLR according to the ownership indicated by the called number, wherein the called The original home location register is the home location register indicated by the ownership relationship of the called number; in the embodiment of the present invention, the originating mobile switching center MSC or other switching devices that follow up the call, such as the gateway MSC, can be collectively referred to as The calling switching device. the

Step 103: The original HLR determines that the number of the called user is a portable number or the number has been carried out of the network and is not in the HLR, and the HLR sends a request message to the local NPDB to query the service network information of the called party currently subscribed , to request information about the service network that the user using the number is currently subscribed to. The query request carries the called number, which can be the called directory number DN or MDN or MSISDN or PSTN. This embodiment takes DN as an example. Realize that HLR sends query request to local NPDB, need to provide the query interface of number carrying information between HLR and NPDB, the interface that the embodiment of the present invention adopts can adopt business request SERVICE_REQ or location request LOC_REQ, also can be by adding new message Implementation, the specific implementation will not be repeated here;

Step 104: After the NPDB receives the request to inquire about the service network information of the called party currently subscribed, it performs an inquiry according to the called DN. If there is information about the current network subscribed by the user corresponding to the number in the NPDB, the NPDB responds to the inquiry The message carries the queried network routing code NRC (NetworkRouting Code, the NRC is used to identify the routing information of the called number's current service network), if the user's information does not exist in the NPDB, the NRC will not be returned;

Step 105: If the HLR receives the query response message returned by the NPDB carrying the network routing code NRC, the HLR returns the response message locreq of the location information request to the originating MSC or the gateway MSC, which contains the RNC, and can also return the directory number DN at the same time , these two cells can be returned separately, or they can be combined and returned as one cell, such as NRC+DN, as one cell, NRC+DN can be returned in the roaming number cell, and the NRC can include the operator The identification code (used to identify the service network that the called party currently subscribes to), such as 140 Telecom, 141 China Mobile, and 142 China Unicom, may also include a local network identification code (used to identify the called party’s current local network), and may also include the called party’s current local network. The current routing information of the call, such as the HLR serial number of the called party in the currently subscribed service network, such as 75503, where 755 is the area code, 03 is the home HLR serial number of the called number, and of course the local network identification code and HLR serial number It may not include or only include one of them, because such information can be further obtained by analyzing the carried DN number. the

Step 106: The originating MSC or the gateway MSC routes the call to the current service network of the called number according to the received NRC, and carries the NRC and the called DN number at the same time. DN), this form is also used to carry the information at this time;

Step 107: The service network that the called number currently subscribes to connects the call according to the NRC and DN. This connection is the same as the normal called connection that belongs to the network number, and will not be described in detail here. the

Embodiment 1 of the present invention, after receiving the call request, the originating MSC or the gateway MSC still finds the original HLR according to the affiliation relationship of the called number and requests the location information of the called user. After the original HLR receives the location request message , request the number portability information from NPDB, NPDB obtains the network routing code NRC of the called number according to the called number and returns it to the original home location register, and the original home location register returns the NRC to the originating MSC or gateway MSC, thereby Make the originating MSC or the gateway MSC connect the call to the service network currently subscribed by the called number according to the NRC. the

The method for implementing number portability provided by this embodiment does not need to modify the attribution of the number segment, nor does it need to modify the switching equipment. Routing or location information; at the same time, it is only necessary to provide a query interface for number portability information between HLR and NPDB. For NPDB, the data configuration transformation carried out is also relatively small, and only need to configure the number of the new subscription service network in this network. Routing code information is enough; Certainly, NPDB also can be configured the routing code information of the newly contracted service network of other network, and the HLR query that allows different standards such as the HLR query of CDMA, GSM, TD_CDMA etc.; The amount of modification is small, and there is no need to transform the MSC of the entire network. Only the original HLR support is required. This service can be opened gradually according to the local network, without involving the cooperation of the entire network, and has little impact on the network organization structure of the existing network. Data configuration transformation Small. the

Embodiment 2 of the present invention, as shown in Figure 2, this embodiment takes short messages as an example, and the process of realizing the number portability service includes:

Step 201: the calling user sends a short message to the called user

Step 202: After receiving the short message, the short message center SMC sending the short message to the called user sends a location information request message SMSREQ to the original home location register HLR of the called user;

Step 203: the original HLR determines that the number of the called user is a portable number or the number has been carried out of the network, and is not in this HLR, and the HLR sends a request message of inquiring about the service network information of the called current contract to the local NPDB , to request information about the service network currently subscribed by the user using the number, and the query request carries the called number, such as DN; 

Step 204: After the NPDB receives the request message for querying the service network information of the called party currently subscribed, it performs a query according to the DN, and if the information of the current network subscribed by the user corresponding to the number exists in the NPDB, then the NPDB will include the information in the query response message Carry the network routing code NRC, if the user's information does not exist in the NPDB, the NRC will not be returned;

Step 205: If the HLR receives the query response message returned by the NPDB to carry the network routing code NRC, the HLR returns the response message of the short message routing request to the SMC, which carries the RNC and the directory number DN. In this embodiment, the NRC+DN Of course, the HLR may not return the DN information, because the SMC has already known the called number when it receives the SMS call request, and it can be added later; 

Step 206: The SMC routes the call to the current service network of the called number according to the received NRC, and carries the NRC and the called DN number at the same time;

Step 207: The service network currently subscribed by the called number performs call connection according to NRC and DN. This connection is the same as the normal called connection belonging to the network number, and will not be described in detail here. the

Embodiment 2 of the present invention, after receiving the short message request, the short message center still finds the original home location register according to the attribution relationship of the called number to request the location information of the called user, and the original home location register receives the location request message , request the number portability information from NPDB, NPDB obtains the network routing code NRC of the called number according to the called number and returns it to the original home location register, and the original home location register returns the NRC to the short message center, so that the short message The center connects the call to the service network currently subscribed by the called number according to the NRC. The short message center may be the calling short message center, the called short message center, or other short message service platforms. the

The implementation method of number portability provided by this embodiment requires little modification to the network, and does not need to be modified by the SMC of the entire network. Only the HLR that originally needs to belong to is supported. This service can be opened gradually according to the local network, without involving the cooperation of the entire network. The network organization structure of the existing network has little influence, and the data configuration modification is small. It is only necessary to add and configure the routing codes of each network. the

Embodiment 3 of the present invention, as shown in Figure 3, the process of implementing the number portability service in this embodiment includes:

Step 301: the calling user initiates a call to the called user

Step 302: After receiving the call request, the originating mobile switching center MSC or gateway MSC sends a location information request message LOCREQ to the original home location register HLR of the called number according to the ownership indicated by the called number;

Step 303: The original HLR determines that the number of the called user is a portable number or the number has been carried out of the network and is not in the HLR, and the HLR returns a location request response message to the originating mobile switching center MSC or gateway MSC, which carries the local The information of network NPDB, the information of this NPDB can be address information, also can be other such as NPDB access code information, and MSC can address this NPDB after obtaining the information of this NPDB, and in this embodiment, HLR also can not need to determine to be Ask the user to directly return the NPDB information to carry the number;

Step 304: The originating mobile switching center MSC or the gateway MSC sends a request message to the NPDB to query the information of the service network currently subscribed by the called party according to the obtained NPDB information, so as to request to obtain the information of the service network currently subscribed by the user using the number Information, the query request carries the DN of the called number;

Step 305: After the NPDB receives the request message of inquiring about the service network information of the called party's current subscription, the query is performed according to the called DN. The response message carries the queried network routing code NRC. If the user's information does not exist in the NPDB, the NRC will not be returned;

Step 306: The originating MSC or gateway MSC routes the call to the current service network of the called number according to the received NRC, and carries the NRC and the called DN number at the same time;

Step 307: The service network currently subscribed by the called number performs call connection according to NRC and DN. This connection is the same as the normal called connection belonging to the network number, and will not be described in detail here. the

Embodiment 3 of the present invention, after receiving the call request, the originating MSC or gateway MSC still finds the original HLR according to the affiliation relationship of the called number and requests the location information of the called user. After the original HLR receives the location request message , return the NPDB information to the MSC, and the MSC requests the NPDB to obtain the number portability information according to the NPDB information, and the NPDB obtains the network routing code NRC of the called number according to the called number and returns it to the originating MSC or gateway MSC, so that the originating The MSC or the gateway MSC connects the call to the service network currently subscribed by the called number according to the NRC. the

In this embodiment, the data in the HLR is configured so that it returns NPDB information to the MSC without a large number of modifications to the mobile switching equipment. The connection is completed by carrying the information, and the number portability service can be realized by making minor changes to the existing network. the

Embodiment 4 of the present invention, as shown in Figure 4, this embodiment takes short messages as an example, and the process of realizing the number portability service includes:

Step 401: the calling user sends a short message to the called user;

Step 402: After receiving the short message, the short message center SMC that sends the short message to the called party sends a location information request message SMSREQ to the original home location register HLR of the called user;

Step 403: The original HLR determines that the number of the called user is an unknown number or the number has been carried out of the network and is not in the HLR, and the HLR returns a location request response message to the SMC, which may carry the unknown number or has been carried out of the network information (this information is used to instruct the SMC to query in the NPDB), it can also carry the information of the NPDB of the local network, if the SMC has configured the information of the NPDB, it can also not carry the information of the NPDB;

Step 404: According to the indication that the number has been carried out of the network, the SMC sends a request message to the NPDB to query the information of the service network that the called party currently subscribes to, so as to request to obtain the information of the service network that the user using the number currently subscribes to. The request carries the DN of the called number. It should be noted that when the SMC has configured the NPDB information, the above steps 402 and 403 may not be executed. It is also a feasible way for the SMC to directly query the NPDB. Of course, if When the SMC has configured the NPDB information, steps 402 and 403 can also be performed. At this time, whether the called party is a number portability user or has been carried out of the network can be obtained from the HLR, and step 404 is executed according to the information, so that the implementation process is more rigorous;

Step 405: After the NPDB receives the request message for querying the service network information of the called party currently subscribed, it performs a query according to the called DN. The response message carries the queried network routing code NRC. If the user's information does not exist in the NPDB, the NRC will not be returned;

Step 406: The SMC routes the call to the current service network of the called number according to the received NRC, and carries the NRC and the called DN number at the same time;

Step 407: The service network currently signed by the called number performs call connection according to the NRC and DN. This connection is the same as the normal called connection belonging to the network number, and will not be described in detail here. the

In Embodiment 4 of the present invention, the SMC requests the NPDB to obtain the number portability information, and the NPDB obtains the network routing code NRC of the called number according to the called number and returns it to the SMC, so that the NRC of the SMC connects the call to the current contract of the called number. service network. In this embodiment, the number portability service can be realized by making minor changes to the existing network. the

An embodiment of the device of the present invention, a home location register, including:

The trigger unit 51 is used to trigger the query unit 52 when receiving the location information or routing information request message sent by the calling switching device or the short message center;

The query unit 52 is configured to send a query request message to the number portability database, wherein the query request message carries the called number to obtain information about the service network currently subscribed by the called party, and receive the number portability The network routing code returned by the capability database according to the called number, wherein the network routing code is used to identify the routing address of the service network that the called party currently subscribes to;

The sending unit 53 is configured to send the network routing code obtained by the query unit to the calling switching device or short message center through a location information response message or a routing information request response message, so that the calling switching device The device or the short message center performs call connection according to the network routing code. the

Embodiment 1 of the system of the present invention, the realization system of the number portability service includes:

The original home location register 61 of the called party is used to receive the location information or routing information request message sent by the switching device or short message center of the calling party, and send a query request message to the number portability database, wherein the query request message carries the The called number is used to obtain the service network information currently subscribed by the called party, and receive the network routing code returned by the number portability database according to the called number, and pass the obtained network routing code through the location information Or send a routing information request response message to the calling switching device or short message center, so that the calling switching device or short message center performs call connection according to the network routing code;

The number portability database 62 is configured to receive the query request message sent by the called original home location register, obtain the network routing code according to the called number in the query request message, and return it to the The original home location register of the called party, wherein the network routing code is used to identify the routing address of the service network that the called party currently subscribes to. the

In the second embodiment of the system of the present invention, the system for realizing the number portability service includes:

The called original home location register 71 is used to receive the location information or short message routing information request message sent by the calling switching device or short message center, and return the location information or routing information request response carrying the information of the number portability database information;

The calling switching device or short message center 72 is configured to send a query request message to the number portability database according to the information in the number portability database, wherein the query request message carries the called number, To obtain the service network information currently subscribed by the called party, receive the network routing code returned by the number portability database according to the called number, and perform call connection according to the network routing code;

The number portability database 73 is used to receive the query request message sent by the calling switching device or short message center, obtain the network routing code according to the called number in the query request message, and return it to The switching device or short message center of the calling party. the

In the third embodiment of the system of the present invention, the system for realizing the number portability service includes:

The short message center 81 is configured to send a query request message to the number portability database according to the number portability database information configured by itself, wherein the query request message carries the called number to obtain the service currently subscribed by the called party Network information, receiving the network routing code returned by the number portability database according to the called number, wherein the network routing code is used to identify the routing address of the service network that the called party currently subscribes to, according to the network Routing code for call connection;

The number portability database 82 is configured to receive the query request message sent by the short message center, obtain the network routing code according to the called number in the query request message, and return it to the short message center;

The called original home location register 83 is used to return a location information or routing information request response message to the short message center, wherein the carrying number in the response message carries an indication that the called number has been carried out of the network;

Correspondingly, the short message center 81 sends a query request message to the number portability database according to the indication that the called number has been ported out of the network. the

Those skilled in the art can understand that all or part of the steps in the methods of the above embodiments can be implemented by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (15)

1. A method for implementing a number portability service, comprising: The called original home location register receives the location information request or short message routing information request message sent by the switching device or the short message center, and the called original home location register sends a query request message to the number portability database, wherein the query The request message carries the called number to obtain the service network information of the called party currently subscribed; The original home location register of the called party receives the network routing code returned by the number portability database according to the called number; The original home location registration of the called party sends the network routing code to the switching device or short message center, so that the switching device or short message center performs call connection according to the network routing code. 2. The method of claim 1, wherein The sending the network routing code to the switching device or the short message center specifically includes: Sending the network routing code to the switching device or the short message center through a location information request response message or a short message routing information request response message. 3. The method according to claim 1, further comprising: before sending the query request message to the number portability database: It is determined that the called number is an unknown number or that the called number has been carried out of the network. 4. The method according to claim 1, further comprising: sending the called number to the switching device or a short message center. 5. The method according to claim 4, characterized in that, the network routing code and the called number are sent to the switching device or the short message center as a cell; or, the network routing The code and the called number are sent to the switching device or the short message center respectively. 6. The method according to claim 1, wherein the network routing code comprises any one of the following or a combination thereof: operator identification code, local network identification code of the called party in the currently subscribed service network Or the HLR serial number. 7. A method for implementing a number portability service, comprising: receiving a location information request response or a short message routing information request response message returned by the original home location register of the called party, wherein the response message carries the information of the number portability database; Sending a query request message to the number portability database according to the information of the number portability database, where the query request message carries the called number to obtain information about the service network currently subscribed by the called party; receiving the network routing code returned by the number portability database according to the called number; The call is connected according to the network routing code. 8. The method according to claim 7, wherein the network routing code comprises any one of the following or a combination thereof: an operator identification code, a local network identification code of the called party in the currently subscribed service network Or the HLR serial number. 9. A method for implementing a number portability service, comprising: The short message center sends a query request message to the number portability database according to the number portability database information configured by itself, wherein the query request message carries the called number to obtain the service network information of the called party currently subscribed; The short message center receives the network routing code returned by the number portability database according to the called number; The short message center performs call connection according to the network routing code. 10. The method according to claim 9, wherein, before the short message center sends the query request message to the number portability database, it also includes: The short message center receives the short message routing information request response message returned by the original home location register of the called party, wherein the response message carries an indication that the called number is unknown or has been carried out of the network; Correspondingly, the short message center sends a query request message to the number portability database according to the indication that the called number is unknown or has been carried out of the network. 11. A home location register, comprising: A trigger unit, configured to trigger the query unit when receiving a location information request or a short message routing information request message sent by the switching device or the short message center; The query unit is configured to send a query request message to the number portability database, where the query request message carries the called number to obtain the service network information currently subscribed by the called party, and receive the number portability database according to The network routing code returned by the called number; a sending unit, configured to send the network routing code obtained by the query unit to the switching device or short message center through a location information response message or a routing information request response message, so that the switching device or short message center The above network routing code is used for call connection. 12. A system for implementing a number portability service, comprising: The original home location register of the called party is used to receive the location information request or the short message routing information request message sent by the switching device or the short message center, and send a query request message to the number portability database, wherein the query request message carries the called number, to obtain the service network information currently subscribed by the called party, and receive the network routing code returned by the number portability database according to the called number, and pass the obtained network routing code through the location information request response or The short message routing information request response message is sent to the switching device or the short message center, so that the switching device or the short message center performs call connection according to the network routing code; The number portability database is configured to receive a query request message sent by the original home location register of the called party, obtain the network routing code according to the called number in the query request message, and return it to the called party Called origin home location register. 13. A system for implementing a number portability service, characterized in that it comprises: The original home location register of the called party is used to receive the location information or short message routing information request message sent by the switching device or the short message center, and return the location information or routing information request response message carrying the information of the number portability database; The switching device or the short message center is configured to send a query request message to the number portability database according to the information of the number portability database, wherein the query request message carries the called number to obtain the number portability database. The service network information of the called party currently subscribed, receiving the network routing code returned by the number portability database according to the called number, and performing call connection according to the network routing code; The number portability database is used to receive the query request message sent by the switching device or the short message center, obtain the network routing code according to the called number in the query request message, and return it to the switching device or short message center. 14. A system for implementing a number portability service, comprising: The short message center is configured to send a query request message to the number portability database according to the number portability database information configured by itself, wherein the query request message carries the called number to obtain the service network currently subscribed by the called party information, receiving the network routing code returned by the number portability database according to the called number, and performing call connection according to the network routing code; The number portability database is configured to receive the query request message sent by the short message center, obtain the network routing code according to the called number in the query request message, and return it to the short message center. 15. The realization system according to claim 14, characterized in that, the realization system further comprises: The original home location register of the called party is used to return a location information request response or routing information request response message to the short message center, wherein the response message carries an indication that the called number is unknown or has been carried out of the network ; Correspondingly, the short message center sends a query request message to the number portability database according to the indication that the called number is unknown or has been carried out of the network.

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