WO2012126303A1

WO2012126303A1 - Method and system for broadcasting talker functional number

Info

Publication number: WO2012126303A1
Application number: PCT/CN2012/071313
Authority: WO
Inventors: 张学军; 孔亚洲
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-03-23
Filing date: 2012-02-20
Publication date: 2012-09-27
Also published as: CN102164350A

Abstract

Disclosed are a method and system for broadcasting a subscriber functional number. The method comprises: a Mobile Switching Centre (MSC) acquiring the terminal identification code of a talker from a message sent by a base station controller (BSC); the MSC acquiring the functional number of the talker according to the terminal identification code of the talker; the MSC sending the functional number to all the BSCs corresponding to the current group call area; the BSC broadcasting the functional number of the talker to all the listeners in the group call. The listener can acquire the identification information about the talker by means of the technical solution in the present invention.

Description

Method and system for broadcasting speaker function number

The present invention relates to the field of mobile communications, and in particular to a method and system for broadcasting a speaker function number. Background technique

Voice Group Call Service (VGCS) is a cluster service. The number of users participating in a group call varies from tens to even hundreds of users. All participating users are divided into two categories: Service subscribers with a maximum number of users and up to 5 Dispatchers. A service user can only participate in a group call in a group call area, and a group call area is composed of one or several cells. All service users in a group call have only one uplink channel (Uplink). ₀ The service user as the listener needs to apply for the uplink channel through the uplink request (Uplink Req) signaling to become the speaker. After the completion, the uplink release indication is given. The (Uplink Release Ind) signaling indicates that the network releases the upstream channel and becomes the listener again. The uplink channel can be applied by the service user when it is idle, and can be preempted by the higher priority service user when it is occupied. The speaker of a group call can be replaced multiple times.

At present, in the group call, the listener's Talker Identity function, according to the 3rd Generation Partnership Project (3GPP) TS43.068 protocol, the network can broadcast to group listeners. The speaker's business card: A string of information about the speaker, for example: Matthew Baker, which is referred to as the "business card function".

1 is a schematic diagram of a network structure of a group call to a listener to broadcast a speaker's business card in the prior art. As shown in FIG. 1, the speaker signs a string business card in a Home Location Register (HLR); When the HLR inserts the user data, the additional information (Additional Information) field carrying the business card information is inserted into the visitor location register. (Visitor Location Register, referred to as VLR); When the service user requests to speak successfully, the Mobile Switching Center (MSC) queries the speaker's string business card subscription information in the VLR and adds the information through the VGCS (VGCS ADDITIONAL). The Talker Identity field in the UPLINK REQUEST ACKNOWLEDGE and UPLINK SEIZED COMMAND messages is sent to the Base Station Controller (BSC), which is then passed by the BSC. The Base Transceiver Station (BTS) broadcasts in all cells of the group call, and all the listener terminals of the group call are received and displayed on the railway-dedicated global mobile communication system (Global System of Mobile communication for Railways). , referred to as GSM-R) on the terminal screen.

The GSM-R system is a strict role control system. A user can perform different roles at different times. The function number representing the same role can be registered by different users at different times, and no need to execute one more. The conversion of name to role, that is, the recognition of the post does not recognize people. Therefore, in the GSM-R system, users (railway managers of various duties) are identified by a role, that is, a function number (FN). The business card, because of the limitation of the maximum information length, usually only displays the user's name. The function number is not conveniently registered and revoked by the user through the terminal. It can be seen that the GSM-R system mutually interacts with the direct function number. Identification is more in line with industry characteristics.

Currently, in the prior art, for the GSM-R system, the protocol does not explicitly define the Talker Identity field and the mobile application part of the A interface VGCS Additional Information message.

(Mobile Application Part, abbreviated as MAP) signaling the specific encoding mode of the Additional Information information field, and because the business card function of the group call involves multiple network elements such as HLR/MSC/VLR/BSC/MS, and the protocol does not have a clear business card. The specific encoding format of the string information causes the device vendors to have no research and development basis. These network elements are difficult to match.

In addition, for the above reasons, the network in the GSM-R system does not support displaying to the group listeners. The function number of the person, that is, the network cannot broadcast the speaker's function number to the group listener, so that the listener does not know any identity information of the speaker. Summary of the invention

The present invention provides a method and system for broadcasting a speaker function number to solve the problem that the network in the existing GSM-R system cannot broadcast the speaker's function number to the group listener.

The present invention provides a method for broadcasting a speaker function number, including:

The mobile switching center MSC obtains the speaker's terminal identification code from the message sent by the base station controller BSC;

The MSC acquires the speaker's function number according to the speaker's terminal identification code;

The MSC sends the function number to all BSCs corresponding to the current group call area;

The BSC broadcasts the speaker's feature number to all listeners in the group call.

The present invention also provides a system for broadcasting a speaker function number, including:

a base station controller BSC, configured to send a message carrying the speaker's terminal identification code to the mobile switching center MSC;

The MSC is configured to obtain the terminal identifier of the speaker from the message sent by the BSC, obtain the function number of the speaker according to the terminal identifier, and send the function number to all BSCs corresponding to the group call area of the current group call;

The BSC is used to broadcast the speaker's function number to all listeners in the group call.

The beneficial effects of the present invention are as follows:

After obtaining the function number of the speaker, the MSC sends the function number of the string format to the BSC, and broadcasts the function number to the listener through the BSC, thereby solving the problem that the network cannot be used in the existing GSM-R system. The problem of the listener broadcasting the speaker's function number enables the listener to obtain the speaker's identity information based on the feature number. DRAWINGS

1 is a schematic diagram of a network structure of a group caller's broadcaster's business card in the prior art; FIG. 2 is a flowchart of a method for broadcasting a speaker's function number according to an embodiment of the present invention; FIG. 3 is a 3GPP TS48. Schematic diagram of the definition of the Talker Identity field in the 008 protocol;

4 is a schematic diagram of a Talker Identity field field definition according to an embodiment of the present invention;

5 is a flowchart of a broadcast function number when a priority service user occupies an uplink call right according to an embodiment of the present invention;

6 is a flowchart of a broadcast function number when a normal service user occupies an uplink call right according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a system for broadcasting a speaker function number according to an embodiment of the present invention. detailed description

In order to solve the problem that the existing GSM-R system network cannot broadcast the speaker's function number to the group caller, the present invention provides a method and system for broadcasting the speaker function number, and the present invention is hereinafter combined with the accompanying drawings and embodiments. Further details will be given. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Method embodiment

According to an embodiment of the present invention, a method for broadcasting a speaker function number is provided, and FIG. 2 is a flowchart of a method for broadcasting a speaker function number according to an embodiment of the present invention. As shown in FIG. 2, according to an embodiment of the present invention, The method of broadcasting a speaker function number includes the following steps:

Step 201: The MSC obtains the terminal identifier of the speaker from the message sent by the BSC. Specifically, after the user (speaker) applies for the uplink channel to the BSC, the MSC acquires the terminal of the user from the layer three message field of the message sent by the BSC. Preferably, the terminal identifier may be: an International Mobile Subscriber Identification Number (IMSI) or a Temporary Mobile Subscriber Identity ( Temporary) Mobile Subscriber Identification Number (TMSI).

Step 202: The MSC obtains the speaker's function number according to the speaker's terminal identification code. The format of the speaker's function number obtained by the MSC is a string format.

Specifically, the MSC obtains the mobile subscriber international ISDN/PSTN Number (MSISDN) from the VLR according to the terminal identifier, and unstructured supplementary data service according to the MSISDN (Unstructured Supplementary Service) Data, referred to as USSD), obtains the function number of the user from the SCP, where the function number has been converted into a string format by the SCP;

In step 202, the MSC carries the MSISDN and the predefined supplementary service code in the message, and sends the message to the SCP in the USSD mode through the pre-defined USSD interface, where the supplementary service code is used to indicate that the SCP needs to perform the search function number. The SCP obtains the MSISDN according to the supplementary service code, searches for the corresponding function number according to the MSISDN, converts the found function number into a string format and sends it to the MSC through the USSD interface; and the MSC obtains the function number converted into the string format. .

It should be noted that, in the entire GSM-R network, the operation of the predefined USSD interface is established in the networking mode of the function number database (Follow Me Function Node, FFN for short) and the SCP. For the system or networking mode in which the FFN is directly embedded in the MSC, the predefined USSD interface is not required. Table 1 is the parameters included in the USSD message.

Table 1 Parameter Name Request Refers to "^ Response Confirmation Request ID M M(=) M(=) M(=)

USSD data encoding party

M M(=) C c(=) case

USSD string M M(=) C c(=)

MSISDN C c(=) User error C c(=) Vendor error 0 The USSD string ( USSD String ) of the USSD request message sent by the MSC is defined as follows: *ServiceCode*calling number#, the service code is defined as 228, for example: *228 *8615912348888# _{0 The} SCP returns the speaker's feature number in the 'USSD String' in the USSD response message, using the USSD string format, for example: 08650078312.

Preferably, the SCP can also translate the speaker's function number into a character description character and then send it to the MSC: Translate the function number '08620000110' into "1 car running car length".

Step 203: The MSC sends the function number to all the BSCs corresponding to the current group call area. Specifically, the MSC carries the function number converted into the string format in the Talker Identity field field, and the The message is sent to all BSCs corresponding to the group call area of the current group call, and the user's function number is broadcasted to all listeners in the group call by the BSC.

3 is a schematic diagram of a definition of a Talker Identity field in a 3GPP TS48.008 protocol according to an embodiment of the present invention. As shown in FIG. 3, the Talker Identity field includes an element identifier, a length, a padding byte, a speaker identification field, and a backup word. Section. 4 is a schematic diagram of a Talker Identity field field definition according to an embodiment of the present invention. As shown in FIG. 4, the Talker Identity field field includes a CBS data coding scheme and user data, where the CBS data coding scheme can be referred to the 3GPP TS23.038 protocol. Support for "GSM 7 bit default alphabet", UCS2 encoding, English, Russian, etc. are optional; in addition, user data needs to be determined according to the encoding format, see 3GPP TS23.038 protocol.

In actual applications, the function number converted to the string format can be carried in the user data of the Talker Identity field. The length of the function number in the string format is less than or equal to 18 English characters, or the length of the function number in the string format. Less than or equal to 8 Chinese characters, that is, for English strings, up to [16 x 8/7] = 18 characters, and for Chinese characters, up to [16/2] = 8 Chinese characters. In addition, it should be noted that the additional information defined in the inserted user data is consistent with the A port, that is, the specific coding mode of the function number converted into the string format is consistent with the specific coding mode of the A port.

Step 204: The BSC broadcasts the speaker's function number to all listeners in the group call.

Specifically, the BSC is all BSCs corresponding to the current group call zone.

In a specific technical solution of the embodiment of the present invention, a user who applies for an uplink channel request speech to the BSC may be classified into a normal service user without priority and a priority service user with priority. When the two types of users apply for an uplink channel request speech, The procedure for broadcasting the speaker's function number to the listener is different. The following describes the process of broadcasting the function number to the listener for the normal service user and the priority service user.

First, priority business users

When a priority service user requests/preempts an uplink channel through an uplink request (Uplink Request) message, the L3 msg in the message carries the IMSI/TMSI information, and the MSC acquires the user's MSISDN in the VLR according to the user's IMSI/TMSI. Then, the USSD method is used to obtain the speaker's function number from the SCP. The SCP converts the function number into a string format, for example: 08650078312, the MSC sends the function number to the BSC through the UPLINK REQUEST ACKNOWLEDGE message and the VGCS ADDITIONAL INFORMATION message, and the BSC will function. The number is broadcast to all listeners.

FIG. 5 is a flowchart of a broadcast function number when a priority service user occupies an uplink call right according to an embodiment of the present invention. As shown in Figure 5, the following steps are included:

Step 501: When the priority service user of the group caller displays the uplink channel idle icon in the terminal, press the PTT button to apply for the uplink, and send an uplink access (UPLINK_ACCESS) message to the BSC;

Step 502: The BSC returns an UPLINK_ACCESS_GR ANT message to the MS, and agrees to apply for an uplink. Step 503: The BSC broadcasts an uplink busy (UPLINK_BUSY) message to all cells in the group call of the BSC, and broadcasts to notify all users that the uplink is occupied;

Step 504: The BSC sends an uplink request (UPLINK_REQ) message to the MSC to apply for an uplink, where the UPLINK_REQ message includes a layer 3 message (L3 msg), and the layer 3 message carries a terminal identifier, for example: IMSI Or TMSI;

Step 505: After obtaining the MSISDN number of the user by using the terminal identifier to the VLR, the MSC sends a USSD request (USSD_REQ) message to the SCP to obtain the function number (Function Number, FN) of the user, where the USSD_REQ message is carried. MSISDN and custom supplementary service code;

Step 506: The SCP returns a USSD response (USSD_Rsp) message to the MSC, where the message includes the function number of the user;

Step 507, the MSC agrees to the uplink occupation request, and sends an uplink request response message to the BSC. The Talker Identity field of the uplink request response message carries the function number: UPLINK_REQ_ACK(TalkerIdentity[FN]);

Step 508: The BSC applying for the uplink broadcasts the additional information carrying the function number to the listener: ADD_INFO(TalkerIdentity[FN]);

Step 509: The MSC sends a VGCS additional information message carrying the function number to the other BSCs: VGCS_ADD_INFO(TalkerIdentity[FN]), where the function number is broadcasted by the Talkerldentity string format;

Step 510: The other BSC broadcasts additional information carrying the function number to the listener:

ADD_INFO(TalkerIdentity[FN])

Second, ordinary business users

When a normal service user without priority requests an uplink channel through an Uplink Request message, L3 msg in the Uplink Request Conf message carries IMSI/TMSI information, and the MSC is based on the IMSI/TMSI of the user. Get the user's in the VLR The MSISDN obtains the speaker's function number through the USSD mode to the SCP, converts the function number into a string format, and sends the function number to the BSC through the VGCS ADDITIONAL INFORMATION message, and the BSC broadcasts the function number to all listeners.

FIG. 6 is a flowchart of a broadcast function number when a normal service user occupies an uplink call right according to an embodiment of the present invention. As shown in Figure 6, the following steps are included:

Step 601: When the normal service user who is the group caller displays the uplink channel idle icon in the terminal, press the PTT button to apply for the uplink, and send the uplink ί3⁄4 wife to the UPLINK_ACCESS message to the BSC;

Step 602: The BSC sends a UPLINK_REQ message to the MSC to apply for an uplink. In step 603, the BSC returns an uplink (UPLINK_ACCESS_GR ANT) message to the MS, and agrees to apply for an uplink.

Step 604: The BSC broadcasts an uplink busy (UPLINK_BUSY) message to all cells in the group call of the BSC, and broadcasts to notify all users that the uplink is occupied;

Step 605, the MSC agrees to the uplink occupation request, and sends an uplink request response message (UPLINK_REQ_ACK) to the BSC;

Step 606: The BSC sends an uplink request confirmation message (UPLINK_REQ_ACK) to the MSC, where the message carries a layer three message (L3 msg), and the layer three message carries the terminal identification code. Step 607: The MSC obtains the terminal identifier according to the terminal identifier to the VLR. After the MSISDN number of the user, the USSD request sends a USSD request (USSD_REQ) message to the SCP to obtain the user's function number. The USSD_REQ message carries the MSISDN and the customized supplementary service code. Step 608, the SCP returns a USSD response to the MSC. USSD_Rsp ) message, which contains the user's feature number;

Step 609: The MSC performs a Talker Identity broadcast, and sends a VGCS_ADD_INFO (TalkerIdentity[FN]) to the BSC applying for the uplink, where the function number is broadcasted through the Talker Identity string format. Step 610: Apply for an uplink BSC broadcast ADD_INFO (TalkerIdentity[FN]); Step 611, the MSC performs a Talker Identity broadcast, and sends a UPLINK_SEIZED_CMD (TalkerIdentity[FN]) to the other BSC, where the function number is broadcasted through the Talkerldentity string format. ;

Step 612: The other BSC broadcasts an uplink busy (UPLINK_BUSY) message to all cells in the group call of the BSC, and broadcasts to notify all users that the uplink is occupied;

Step 613, the other BSC broadcasts ADD_INFO (TalkerIdentity[FN]) to the listener.

After obtaining the function number of the speaker, the MSC carries the function number converted into the string format in the speaker identification field and sends it to the BSC, and broadcasts the function number to the listener through the BSC, thereby solving the existing In the technical GSM-R system, the network cannot broadcast the speaker's function number to the group listener, so that the listener can obtain the speaker's identity information according to the function number.

System embodiment

According to an embodiment of the present invention, a system for broadcasting a user function number is provided. FIG. 7 is a schematic structural diagram of a system for broadcasting a listener function number according to an embodiment of the present invention. As shown in FIG. 7, a broadcast according to an embodiment of the present invention is shown. The system of the listener function number includes: BSC 70, MSC 72, and each module of the embodiment of the present invention is described in detail below.

The BSC 70 is configured to send a message carrying the speaker's terminal identifier to the mobile switching center MSC 72;

Specifically, after receiving the message that the user applies for the uplink channel, the BSC 70 sends a message carrying the terminal identifier of the user in the layer 3 message field to the MSC 72. Preferably, the terminal identification code may be: IMSI or TMSI.

The MSC 72 is configured to obtain a function number of the speaker according to the terminal identifier, and send the function number to all BSCs 70 corresponding to the group call area of the current group call;

Specifically, the MSC 72 is configured to obtain a terminal identifier from the layer three message field, and obtain a user's mobile subscriber international integrated service digital network number (MSISDN) from the VLR according to the terminal identifier. Obtaining the function number of the user from the service control point SCP according to the MSISDN in the unstructured supplementary data service USSD mode, carrying the function number converted into the string format in the speaker identification field of the message, and sending the message to the current group call Group call area corresponding to all BSC 70;

The BSC 70 broadcasts the user's function number to all listeners in the group call;

Specifically, the MSC 72 may carry the MSISDN and the predefined supplementary service code in the message, and send the message to the SCP in the USSD mode through a pre-defined USSD interface, where the supplementary service code is used to indicate that the SCP needs to perform the search. The function number is operated; the SCP obtains the MSISDN according to the supplementary service code, searches for the corresponding function number according to the MSISDN, converts the found function number into a string format and sends it to the MSC 72 through the USSD interface; and the MSC 72 acquires the converted function string. The functional number of the format.

It should be noted that, in the entire GSM-R network, the operation of the predefined USSD interface is established in a networking manner in which a function number database (Follow Me Function Node, FFN for short) is integrated with the S CP. For a system or networking mode in which the FFN is directly embedded in the MSC 72, a predefined USSD interface is not required. As shown in Table 1, the USSD string (USSD String) of the USSD request message sent by the MSC 72 is defined as follows: *Ser viceCode*calling number#, the service code is defined as 228, for example: *228*861591234888 8#. The SCP returns the speaker's feature number in the 'USSD String' in the USSD response message, using the USSD string format, for example: 08650078312.

The SCP is used to obtain the function number of the user according to the MSISDN, convert the function number into a string format, and send the function number converted into the string format to the MSC 72. Specifically, the MSISDN is obtained according to the supplementary service code, and the corresponding function number is searched according to the MSISDN, and the found function number is converted into a string format and sent to the MSC 72 through the USSD interface.

3 is a Talker Identity field in a 3GPP TS48.008 protocol according to an embodiment of the present invention. A schematic diagram of the definition, as shown in Figure 3, the Talker Identity field includes an element identifier, a length, a padding byte, a speaker identification field, and a backup byte. 4 is a schematic diagram of a Talker Identity field field definition according to an embodiment of the present invention. As shown in FIG. 4, the Talker Identity field field includes a CBS data coding scheme and user data, where the CBS data coding scheme can be referred to the 3GPP TS23.038 protocol. Support for "GSM 7 bit default alphabet", UCS2 encoding, English, Russian, etc. are optional; in addition, user data needs to be determined according to the encoding format, see 3GPP TS23.038 protocol.

In actual applications, the function number converted to the string format can be carried in the user data of the Talker Identity field. The length of the function number in the string format is less than or equal to 18 English characters, or the length of the function number in the string format. Less than or equal to 8 Chinese characters. In other words, for English strings, up to [16 x 8/7] = 18 characters, and for Chinese characters, up to [16/2] = 8 Chinese characters.

In addition, it should be noted that the additional information defined in the inserted user data is consistent with the A port, that is, the specific coding mode of the function number converted into the string format is consistent with the specific coding mode of the A port.

First, priority business users

When a priority service user requests/preempts an uplink channel through an uplink request (Uplink Request) message, the L3 msg in the message carries IMSI/TMSI information, and the MSC 72 acquires the user's MSISDN according to the user's IMSI/TMSI in the VLR. Then, through USSD to SCP 74 to obtain the speaker's feature number, SCP converts the feature number into a string format, for example, 08650078312, the MSC 72 sends the feature number to the BSC 70 through the UPLINK REQUEST ACKNOWLEDGE message and the VGCS ADDITIONAL INFORMATION message.

The BSC 70 broadcasts the feature number to all listeners. For the specific process, reference may be made to FIG. 5, and details are not described herein again.

Second, ordinary business users

When a normal service user without priority requests an uplink channel through an Uplink Request message, L3 msg carries the IMSI/TMSI information in the Uplink Request Conf message, and the MSC 72 is based on the IMSI of the user. The TMSI obtains the user's MSISDN in the VLR, and then obtains the speaker's function number through the USSD method to the SCP, converts the function number into a string format, and sends the function number to the BSC 70 through the VGCS ADDITIONAL INFORMATION message, and the BSC 70 transmits the function number to all listeners. broadcast. For a specific process, reference may be made to FIG. 6. After obtaining the function number of the speaker, the MSC carries the function number converted into the string format in the speaker identification field and sends the function number to the BSC, and broadcasts the function number to the BSC through the BSC. The listener solves the problem that the network cannot broadcast the speaker function number to the group caller in the prior art GSM-R system, so that the listener can obtain the speaker's identity information according to the function number.

Although preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will be aware of various modifications, such as: After the SCP translates the speaker's feature number into a character description character, it is sent to the MSC: The number '08620000110, translated into "1 car running vehicle length", addition and replacement are also possible, and therefore, the scope of the present invention should not be limited to the above embodiment.

Claims

Claim

A method for broadcasting a speaker function number, the method comprising: the mobile switching center MSC obtaining a speaker identification code of the speaker from a message sent by the base station controller BSC;

The MSC acquires the speaker's function number according to the speaker's terminal identification code; the MSC sends the function number to all BSCs corresponding to the current group call zone; the BSC will be the speaker's The feature number is broadcast to all listeners in the group call.

2. The method according to claim 1, wherein the MSC acquires the function number of the speaker according to the terminal identification code, which is:

The MSC obtains the mobile subscriber international integrated service digital network number MSISDN of the speaker from the visit location register VLR according to the terminal identification code;

The MSC acquires the speaker's function number from the service control point SCP according to the MSISDN in the unstructured supplementary data service USSD mode.

The method according to claim 1 or 2, wherein the speaker's function number obtained by the MSC is in a string format.

The method according to claim 2, wherein the MSC acquires the function number of the user from the SCP in the USSD manner according to the MSISDN, as follows:

The MSC carries the MSISDN and the preset supplementary service code in the USSD request message, and sends the USSD request message to the SCP in USSD mode through a preset USSD interface.

The SCP obtains the MSISDN according to the supplementary service code, and searches for the corresponding function number according to the MSISDN, and converts the function number into a string format, and sends the function number to the MSC through the USSD interface.

5. The method of claim 3, wherein

The length of the function number in the string format is less than or equal to 18 English characters; or The length of the function number in the string format is less than or equal to 8 Chinese characters.

A system for broadcasting a speaker function number, the system comprising: a BSC, configured to send, to the MSC, a message carrying a speaker identification code of the speaker;

The MSC is configured to obtain a terminal identifier of the speaker from the message sent by the BSC, obtain the function number of the speaker according to the terminal identifier, and send the function number to the current group call area. All BSC;

The BSC is configured to broadcast the speaker's function number to all listeners in the group call.

The system according to claim 6, wherein the MSC is configured to: obtain, according to the terminal identifier, the MSISDN of the speaker from the VLR;

The speaker's function number is obtained from the SCP in the USSD manner according to the MSISDN.

The system according to claim 6 or 7, wherein the function number of the speaker acquired by the MSC is a character string format.

9. The system of claim 7 wherein:

The MSC is configured to: carry the MSISDN and the preset supplementary service code in the USSD request message, and send the USSD request message to the SCP in USSD mode through a preset USSD interface;

The SCP is configured to: obtain the MSISDN according to the supplementary service code, and search for a corresponding function number according to the MSISDN, convert the function number into a string format, and send the function number to the MSC through the USSD interface. .

The system according to claim 8, wherein the length of the function number in the string format is less than or equal to 18 English characters; or the length of the function number in the string format is less than or equal to 8 Chinese characters.