CN1514562A - Method for realizing ring-back tone service in code division multiple access system - Google Patents

Abstract

The invention discloses a method for implementing a ring-back tone service in a code division multiple access (CDMA) system. The method comprises: A. a calling user dials the number of the called user, the serving MSC receives the incoming call request, and the serving MSC receives the incoming call request according to the incoming call. The called number in the request obtains the subscription information of the called user from the HLR; B. The serving MSC triggers the intelligent call process according to the trigger information in the obtained subscription information of the called user, and routes the call to the RBTS; C. The RBTS will The call is routed to the MSC where the called user is currently visiting, and the MSC at the current visiting place of the called user returns a message including the current working status information of the called user to the RBTS, and the RBTS sends a message to the calling user based on the current working status of the called user in the received message. The user plays the ringback tone, and at the same time, the RBTS cuts off the call with the MSC in the place where the called user is currently visiting; D. When the called user picks up the phone to answer, the MSC in the place where the called user is currently visiting sends a response message to the RBTS, and the RBTS connects to the calling user and the called party, and stop playing the ringback tone at the same time.

Description

Method for realizing ring-back tone service in code division multiple access system

technical field

The invention relates to the ring-back tone service field in the wireless communication technology, in particular to a method for realizing the ring-back tone service in a Code Division Multiple Access (CDMA) system.

Background technique

The ring back tone service is a service that allows mobile phone users to customize the ring back tone for their mobile phones. The user can set the customized ring back tone as a pleasant music or a recording. The mode that the user customizes the ring back tone specifically can comprise: select service provider (SP) or the music provided by the operator on the corresponding website by the Internet (INTERNET) as the ring back tone; Enter the number, record the user's voice or a piece of music as its own ring back tone. When the user has applied for the ring back tone service, when other users dial the user's mobile phone, the ring back tone heard is the music or recording selected by the user.

In the prior art, there is no method for implementing the ring-back tone service in the CDMA system, thereby limiting the service function of CDMA, making it impossible for users to obtain more sufficient and free services, thereby limiting the competitiveness of CDMA providers.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for realizing the ring back tone service in a Code Division Multiple Access (CDMA) system. The method implements the ring back tone service in the CDMA system, thereby changing the current situation that the ring tones in the existing CDMA system are too monotonous and boring, and introducing beautiful music to enrich the ring tones of CDMA, so as to expand the service capability of the operator and enhance the corporate image of the operator .

The present invention is a kind of code division multiple access system realizes the method for ring back tone service, and this method comprises:

A. The calling user dials the number of the called user, the serving MSC receives the incoming call request, and the serving MSC obtains the subscription information of the called user from the HLR according to the called number in the incoming call request;

B. The serving MSC triggers an intelligent call process according to the obtained subscription information of the called user, and routes the call to the RBTS;

C. The RBTS routes the call to the MSC at the place where the called user is currently visiting, and the MSC at the place where the called user is currently visiting returns a message including the current working status information of the called user to the RBTS, and the RBTS receives the current working status of the called user in the message , play a ringback tone for the calling user, and at the same time, the RBTS cuts off the call with the MSC in the place the called user is currently visiting;

D. When the called user picks up the phone to answer, the MSC in the place where the called user is currently visiting sends a response message to the KBTS, and the RBTS connects the call between the calling user and the called user, and stops playing the ringback tone at the same time.

Wherein, step B includes:

B1. The serving MSC detects that the called process has triggered the trigger in the subscription information, and sends an analysis message to the SCP. The SCP analyzes whether the service trigger supports the ring-back tone service according to the content in the analysis message. If not, follow the general The call processing process completes the call service, otherwise, execute step B2;

B2, SCP judge whether the ring back tone service has been triggered, if so, then complete the call service according to the general call processing process, otherwise, the mark ring back tone service is triggered for the first time;

B3. The SCP sends an advanced-termination trigger to the serving MSC. The serving MSC detects that the called process triggers the trigger, and sends an analysis message to the SCP;

B4, SCP obtains the routing position of the MSC of the current visiting place of the called user from the HLR by querying;

B5. The SCP sends the forwarding number to the serving MSC, wherein the forwarding number includes the RBTS routing address, the MSC routing location of the called user's current visit, and the content of the called number. The serving MSC uses the forwarding number as the called party in the call. call number;

B6. The serving MSC routes the call to the RBTS according to the current called number;

Said in step C, the RBTS routing the call to the MSC of the called user's current visit includes:

C1. The RBTS routes the call to the MSC of the MSC currently visited by the called user according to the routing location of the MSC of the MSC currently visited by the called user in the forwarding number;

C2. The MSC at the place where the called user is currently visiting obtains the subscription information of the called user through the HILR, triggers a trigger in the subscription information, and sends an analysis message to the SCP;

C3, SCP receives the analysis message, judges whether the ring back tone service has been triggered for the first time, if so, then clears the mark that the ring back tone service is triggered for the first time, and executes other functions except the ring back tone service Intelligent service, then execute step C4; Otherwise, return to step B3, execute the ring back tone service;

C4. The SCP instructs the MSC of the currently visited place of the called user to send location request information to the HLR. The HLR judges that the MSC sending the location request is the same as the MSC of the called user's current place of visit according to the location request information, and directly sends the MSC of the currently visited place of the called user. Return the MSCID of the MSC that the called user is currently visiting. The MSC of the called user’s current visiting location analyzes that its own MSCID is the same as the obtained MSCID of the called user’s current visiting location, and directly assigns a TLDN to the called party, and triggers the triggering of the availability of the called routing address. send analysis information to the SCP, and the SCP instructs the MSC to continue call processing.

Wherein, the execution order of step B3 and step B4 is interchanged.

Wherein, step B includes:

B11, the serving MSC triggers the trigger in the user's subscription information, sends an analysis message to the SCP, and the SCP analyzes whether the service trigger supports the ring-back tone service according to the content in the analysis message, if not, then completes the call according to the general call processing process business, otherwise, go to step B12;

B12, SCP judge whether the ring back tone service has been triggered, if yes, then complete the call service according to the general call processing procedure, otherwise, mark the ring back tone service as triggering for the first time;

B13, the SCP issues an advanced-termination trigger for the serving MSC, the serving MSC triggers the trigger, and sends an analysis message to the SCP to notify the SCP to modify the called number on the serving MSC;

B14. The SCP sends the forwarding number including the RBTS routing address and the called number content to the serving MSC, and the serving MSC uses the forwarding number as the called number in the call;

Said in step C, the RBTS routing the call to the MSC of the called user's current visit includes:

C11, RBTS routes the call to the called GMSC;

C12, the called GMSC obtains the subscription information of the called user through the HLR, triggers the trigger in the subscription information, and sends an analysis message to the SCP;

C13, SCP receives analysis message, judges whether the ring back tone service has been triggered for the first time, if so, then clears the mark that the ring back tone service is triggered for the first time, and executes other functions except the ring back tone service Intelligent service, then execute step C14; Otherwise, return to step B13, execute the ring back tone service;

C14. The SCP instructs the called GMSC to send location request information to the HLR. The HLR obtains the TLDN of the MSC where the called user is currently visiting and returns it to the called GMSC. After the GMSC judges that the TLDN is valid, it sends an analysis message to the SCP, and the SCP returns the analysis message The response message indicates that the GMSC continues to process the call, and the GMSC routes the call to the MSC where the called user is currently visiting.

Wherein, when the RBTS supports the LOCREQ operation in the MAP protocol in CDMA, step B includes:

B21, the serving MSC triggers the trigger in the user's subscription information, sends an analysis message to the SCP, and the SCP analyzes whether the service trigger supports the ring-back tone service according to the content in the analysis message, if not, then completes the call according to the general call processing process business, otherwise, go to step B22;

B22. The SCP issues triggers including advanced-termination trigger, called routing address available trigger, and location trigger for the serving MSC. The serving MSC triggers the advanced termination trigger, and sends an analysis message to the SCP to notify the SCP to modify the serving MSC. The called number on

B23. The SCP sends the forwarding number including the RBTS routing address and the called number content to the serving MSC, and the serving MSC uses the forwarding number as the called number in the call;

B24. Using the called routing address available trigger, after the serving MSC determines that the current called number is valid, it sends an analysis message to the SCP, and the SCP returns a response message to the analysis message, instructing the serving MSC to continue call processing, and the serving MSC according to the current called number routing calls to RBTS;

Said in step C, the RBTS routing the call to the MSC of the called user's current visit includes:

By using the LOCREQ operation, the RBTS obtains the routing address of the MSC in the place where the called user is currently visiting through the HLR, and routes the call to the MSC in the place where the called user is currently visiting according to the routing address.

It can be seen that in the present invention, by adding a ring-back tone service voice resource device RBTS, the SCP service software can be upgraded to realize the ring-back tone service. The present invention does not need to upgrade the existing network equipment, and is easy to promote and implement to users. Moreover, through the ring back tone service, the boring ring tone in the existing CDMA system can be replaced with beautiful music. On this basis, a new advertising service method can be evolved, so that mobile operators can provide users with It is in a leading position in personalized services and differentiated services, thereby enhancing the corporate image of operators. The service is triggered twice through the CDMA user's called process, and the ring-back tone service user is supported to sign other smart services, such as PPC, VPN, etc., to provide users with more diversified services.

Description of drawings

Fig. 1 is a ring back tone service networking diagram of the present invention.

FIG. 2 is a flow chart of ring back tone service signaling in Embodiment 1 of the present invention.

FIG. 3 is a continuation of the ring-back tone service signaling flow chart in Embodiment 1 of the present invention.

FIG. 4 is a flow chart of ring back tone service signaling in Embodiment 2 of the present invention.

FIG. 5 is a continuation of the RBT service signaling flow chart in Embodiment 2 of the present invention.

FIG. 6 is a flow chart of ring back tone service signaling in Embodiment 3 of the present invention.

Detailed ways

The present invention is a method for realizing the ring-back tone service in a code division multiple access system. In the case of the center (MSC), the ring back tone service is realized in the CDMA network.

The present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to shown in Fig. 1, the present invention increases RBTS and SP in CDMA network, and wherein, RBTS is used for providing the ring-back tone voice resource, and plays the customized voice before the call is connected, and this RBTS not only has exchange capability as switchboard, And there is also a database, which saves the user information and various user-customized ring-back tones that have subscribed to the ring-back tone. The user can choose various voices provided by the operator through the SP shown in the figure or dial a specific phone number. This setting can not only play a specific ring back tone for a specific calling user, but also can further include playing different ring back tones in different time periods. When other users dial the user, RBTS selects a ring-back tone according to the called number, calling number, current time, called status and other information, and plays it on the current trunk; SP provides various ring-back tones for User, and upload the ring-back tone selected by the user to the RBTS; the service control point SCP plays a role in controlling and processing intelligent services in the entire intelligent network system; MSC mainly completes the service switching function and call control function. The (G)MSC shown in the figure implements the first trigger of the service, that is, the trigger of the ring-back tone service, and the MSC, as the visited MSC of the called user, realizes the second trigger of the service, that is, the trigger of the PPC, VPN and other services. Trigger; the home location register HLR is mainly used to preserve the basic information of the mobile phone, including the subscription service information for smart calling. When the mobile phone location is updated (the mobile phone is turned on or the mobile phone location changes), the HLR sends these information to the MSC. The service management point SMP realizes the management of various data of the SCP. In this figure, the thick line represents the trunk line, which can transmit voice and signaling, while the other thin lines or dotted lines represent the signaling link and transfer signaling and data.

Because the present invention is applied in the CDMA network, therefore, the called party of the present invention is a CDMA user, and the calling party then can be a CDMA user, or for including a fixed network user, a global digital mobile phone system (GSM) user other communications network users. When the calling party is a CDMA user, the serving MSC in the CDMA system is the visiting MSC of the calling party, and when the calling party is a user of other communication networks, the serving MSC in the CDMA system is the mobile switching center gateway ( GMSC).

To realize the ring back tone service on the CDMA system, two triggers are required, namely:

For the first service trigger, the GMSC/MSC of the CDMA network triggers the service trigger process, routes the user's call to the RBTS that provides ring-back tone voice resources, and processes the ring-back tone service;

The second service triggers to process other intelligent services.

The above two triggers will be described respectively below with reference to the accompanying drawings.

In each flow chart described below, uppercase letters and lowercase letters appearing in pairs represent messages and corresponding response messages respectively.

Example 1:

Referring to Fig. 2, the first service trigger in the ring back tone service specifically includes:

Step 201:

The calling user dials the number of the called user and initiates a call to the CDMA called user. The called service MSC receives the incoming call. The incoming call is a call to the called user who subscribed to the ring back tone service. Including calling number and called number; among them, when the calling user is a CDMA user, the serving MSC is the MSC of the place visited by the calling user; when the calling user is a user of other communication networks including fixed network and GSM, The serving MSC is the GMSC of the CDMA system where the called user belongs;

Step 202:

The serving MSC receives the incoming call, judges that the called user is a CDMA user according to the called number in the incoming call, triggers the mobile phone called (Mobile_Termination) trigger, and triggers the called process of the mobile phone, so that the serving MSC sends a location request (LOCREQ) message to HLR, to request to obtain the subscription information of the called user on the HLR, wherein, the location request message at least includes the called user identifier, the serving MSC identifier (MSCID), and the trigger type that is set to Mobile_Termination ;

Step 203:

HLR receives the LOCREQ message, searches the subscription information of the called user in its own database according to the called user identifier in the message, and then, HLR returns the LOCREQ response message to the serving MSC, which at least includes the called user The initial termination trigger (Initial_Termination) information in the subscription information, if the called user is a smart user, the message further includes trigger information such as location (Location), and the called routing address is available (Called_Routing_Address_Available);

In the above steps 201 to 203, the serving MSC obtains the subscription information of the called user on the HLR through the HLR, so as to trigger the first service according to the subscription information;

Step 204:

The called process triggers the Initial_Termination trigger. The serving MSC detects that the called process triggers the trigger and sends an analysis information (ANLYZD) message to the SCP. The analysis message includes at least the trigger type set to Initial_Termination, the calling number, the called number, identification (MSCID) of the serving MSC, and location information of the place where the service is triggered;

Step 205:

The SCP receives the ANLYZD message described in step 204, and judges whether the area where the serving MSC located as the first service trigger place supports the ring-back tone service according to the visiting MSCID of the calling party in the message, if not, then follow the normal call The business process completes the call process, otherwise, the SCP checks in its own database whether the called user has registered the ring-back tone service according to the called number in the received ANLYZD message, if not, completes the call according to the normal call business process, otherwise , judge whether the ring-back tone service flag (RBTFlag) is 0, if not, then do not carry out subsequent steps, directly complete the call to the called user according to the general processing procedure irrelevant to the ring-back tone service, if RBTFlag is 0, then will RBTFlag is set to 1 to identify the first service trigger in the ring-back tone service;

In the above steps 204 to 205, the calling user triggers the intelligent service to the SCP, and the SCP analyzes whether the place the calling user visits supports the ring-back tone service, and judges whether the called user has registered the ring-back tone service. The judgment results are all yes, then the marking service has been processed for the first service trigger, so as to be distinguished from the next service trigger in the ring back tone service;

Step 206:

The SCP returns an anlyzd response message to the serving MSC, wherein the terminal list parameter of the response message includes an Advanced_Termination (Advanced_Termination) trigger, which is used in subsequent steps to modify the called number in the incoming call using the forwarding number , so that the call of the serving MSC is routed to the RBTS, and further routed to the MSC where the called user is currently visiting;

Step 207:

The serving MSC receives the response message of step 206, triggers the advanced_termination (Advanced_Termination) trigger, and sends the ANLYZD message to the SCP to instruct the SCP to perform subsequent steps 208-210, thereby using the forwarding number to modify the incoming call of the serving MSC. Call the number, where the trigger type of the ANLYZD message is Advanced_Termination;

In the above steps 206 to 207, the terminal list parameter of the response message issued by the SCP to the serving MSC includes an advanced_termination trigger, and the serving MSC triggers this trigger to inform the SCP to start checking the called number of the incoming call in the serving MSC. to modify;

Step 208:

SCP sends inquiry (SEARCH) message to HLR, comprises the mobile directory number (MDN) of called user at least in this message, and HLR obtains the MSCID of called user's current visiting place MSC according to this MDN search on itself;

Step 209:

HLR sends a search response message to SCP, which at least includes the MSCID of the called user's visiting place obtained in step 208; SCP searches for the MSCID corresponding to the MSCID according to the MSCID of the called user's current visiting place in the response message. HLR identification code H0H1H2H3, wherein, the HLR identification code was uniformly assigned to the local network by the operator before;

In the above steps 208 to 209, the SCP obtains the MSCID of the MSC in the place where the called user is currently visiting from the HLR, and finds the corresponding H ₀ H ₁ H ₂ H ₃ according to the MSCID, and uses the H ₀ H ₁ H ₂ H ₃ As a part of modifying the forwarding number of the called number in the subsequent steps, and making it possible to directly route the call to the MSC of the current visiting place of the called user according to the H ₀ H ₁ H ₂ H ₃ in the subsequent steps, Thereby reducing possible detours in subsequent steps;

Step 210:

SCP sends the response message of the ANLYZD message described in step 207 to the serving MSC, including the forwarding number in the response message, and this number is passed through the variable TermList, and its format is:

TermList = ringback tone service routing number (RTDGT) + H ₀ H ₁ H ₂ H ₃ + called user MDN; wherein, RTDGT represents the routing location of the RBTS, and H ₀ H ₁ H ₂ H ₃ represents the current visiting place of the called user MSC routing location, MDN is the called party number included in the incoming call;

Step 211:

The serving MSC judges that the forwarded-to number is valid, analyzes the RTDGT in the forwarded-to number and finds that the call needs to be connected to the RBTS, and the serving MSC sends an initial address message (IAI) to the RBTS, wherein the called number in the IAI is set to be forwarded number; the call is routed to the RBTS that provides ring-back tone voice resources, and handles ring-back tone-related services;

In the above steps 210 to 211, the SCP uses the forwarding number to modify the called number of the incoming call in the serving MSC, and routes the call to the RBTS according to the forwarding number, and completes the business related to the ring back tone;

Step 212:

According to the RTDGT of the forwarded-to number in the received IAI, the RBTS analyzes that the calling party has triggered the ring-back tone service. Then, the RBTS strips off the RTDGT in the forwarded-to number, and according to the H ₀ H ₁ H ₂ in the forwarded-to number H ₃ is used for routing, sending IAI to the MSC of the called user's current visit, so as to route the call to the MSC of the called user's current visit represented by the H ₀ H ₁ H ₂ H ₃ ; H ₀ H ₁ H ₂ H ₃ in the forwarding number, so that the called number of the IAI sent by the RBTS to the MSC of the called user's current visit includes only the called MDN;

In the above step 212, the RBTS directly routes the call to the MSC of the place currently visited by the called user according to the forward-to-number, so as to reduce the possibility of detours in subsequent steps.

The above steps complete the first service trigger and realize the relevant processing of the ring back tone service; wherein, the steps 208-209 can also be performed between steps 205 and 206, which does not affect the implementation of the present invention.

The second service triggering process of the ring back tone service is introduced below in conjunction with the accompanying drawings:

Step 301: After the first trigger, the call initiated by the serving MSC is routed to the MSC of the called user's current visited location, and the called user's currently visited MSC is used as the MSC of the second service trigger location, and the called user's currently visited MSC According to the MDN of the called user in the call, the called user is a CDMA user, trigger the Mobile_Termination trigger, and send the LOCREQ message to the HLR to obtain the subscription information of the called user, wherein the trigger type in the LOCREQ message is set to Mobile_Termination ;

Step 302: HLR obtains the subscription information of this user according to the called user's MDN, returns the LOCREQ response message to the MSC of the current visiting place of the called user, and at least includes the trigger information (Initial_Termination) in the called user's subscription information in the response message, if The called user is a smart user, and the message further includes trigger information such as Location and Called_Routing_Address_Available;

In the above steps 301 to 302, the MSC in the place where the called user is currently visiting obtains the subscription information of the called user from the HLR, so as to trigger the second service according to the subscription information;

Step 303: The called process triggers the Initial_Termination trigger, and the called user's current visiting MSC sends an ANLYZD message to the SCP. The analysis message includes at least the trigger type set to Initial_Termination, the calling number, the called number, and the called triggering location MSCID;

Step 304: The SCP analyzes the called number in the ANLYZD message and obtains that the called user has registered the ring-back tone service, and then judges whether the RBTFlag used to identify the number of service triggers is 1, and if so, the SCP resets the RBTFlag to 0 , otherwise, return to the above-mentioned step 206, and execute the ring back tone service; wherein, the function of RBTFlag is to distinguish the first service trigger and the second service trigger, and the initial value of RBTFlag is 0. When the first service trigger is performed, the RBTFlag is set to 1, and when the second service trigger is performed, the value of RBTFlag is set to 0. On the one hand, it is used to identify the second trigger, and on the other hand, the RBTFlag is returned to the initial value to meet the next ringback tone service. when the need;

Step 305: The SCP sends the response message of the ANLYZD message in step 303 to the MSC at the place where the called user is currently visiting; wherein, for ordinary users, the SCP directly sends the response message; After the intelligent business process, send the response message;

In the above steps 303 to 305, the called user's currently visited MSC triggers the smart service to the SCP, and the SCP authenticates the user and marks this service trigger as the second service trigger;

Step 306: According to the fixed configuration in the call flow, the called MSC detects the Location trigger at this time, triggers the trigger, and sends a LOCREQ message to the HLR, so as to obtain the routing information of the called user from the HLR, wherein, in this step, the LOCREQ The trigger type of the message is a Location trigger

Step 307: Since in the embodiment of the present invention, the MSC triggered by the second service that sends the LOCREQ message to the HLR is the same MSC as the MSC visited by the called user, therefore, the HLR judges that the second service reported in the LOCREQ message The triggered MSCID is the same as the MSCID of the called user's current visited place stored on the HLR itself, and the HLR returns a LOCREQ response message to the called user's currently visited MSC as the trigger of the second service, which includes the called user's current The MSCID of the visited MSC, the MSC analyzed by the visited MSC of the user as the second service trigger is the same as its own MSCID, and a temporary local directory number (TLDN) is directly assigned to the call as the called routing number ;

Step 308-Step 309: According to the call flow, the MSC of the called user's current visit triggers the Called_Address_Available trigger, and after judging that the current called number is valid, sends an ANLYZD message to the SCP, and the called routing number parameter in the message is set as step For the TLDN obtained in 307, the SCP sends an anlyzd response message to the called MSC, instructing the called MSC to continue call processing;

In the above steps 306 to 309, it is judged that the MSC where the second service is triggered is the MSC that the called user is currently visiting, so that in the subsequent steps, the MSC that the called user is currently visiting directly executes relevant steps;

Step 310～step 312:

The MSC at the place where the called user is currently visiting sends a call setup and ringing message (Setup&Alert) to the mobile switching device (MS) of the called user, thereby connecting the call to the called MS;

When the MSC of the called user's current visit is paging the called MS, it sends an address complete message (ACM) to the RBTS, indicating that it has been connected to the called party; wherein, the ACM can indicate whether the user is talking at the time; the RBTS analyzes the information of the ACM , judging whether the user is currently in a call state or an idle state, according to the judgment result, and according to the ring-back tone service customized by the user, in the case of temporarily disconnecting the call path with the called user, play a customized reply to the calling user Ring tone;

In the above steps 310 to 312, the MSC at the place where the called user is currently visiting sends a calling and ringing message to the called user, and at the same time, the RBTS is playing a ringback tone to the calling user;

Step 313: The called user picks up the phone, sends an answer message (ANM) to the RBTS, and the RBTS stops playing the ring back tone, and connects the call path between the calling user and the called user;

Step 314: The MSC reports a TANSWER message to the SCP, instructing the SCP to start charging, and then the calling party and the called party start a normal call.

In the above steps 313 to 314, when the called user picks up the phone, a message is sent to the RBTS to instruct the RBTS to stop playing the ring back tone, and connect the call path to realize the call.

Example 2:

Referring to Figure 4, in the first service triggering process of this embodiment, the content described in steps 208 to 209 in embodiment 1 is not included, and the forwarding number in step 210 in embodiment 1 is correspondingly only Including RTDGT and MDN, in step 212, since the H0H1H2H3 corresponding to the MSC of the called user's current visit is not obtained, the RBTS routes the call to the gateway MSC (GMSC) of the called user, and the GMSC is used as the second service trigger .

Referring to Figure 5, since the call is routed to the GMSC during the first triggering process, in this embodiment, the GMSC is used as the second service trigger; in this embodiment, the second service trigger The process specifically includes:

Step 501: After the call is routed to the GMSC through the first trigger, the GMSC obtains that the called user is a CDMA user according to the called user MDN in the call, triggers the Mobile_Termination trigger, and sends a LOCREQ message to the HLR to obtain the called user. Call the user's subscription information, where the trigger type in the LOCREQ message is set to Mobile_Termination;

Step 502: The HLR obtains the subscription information of the user according to the called user MDN, and returns a LOCREQ response message to the GMSC, which at least includes the trigger information (Initial_Termination) in the subscription information of the called user. If the called user is an intelligent user , the message further includes trigger information such as Location, Called_Routing_Address_Available;

Step 503: The called process triggers the Initial_Termination trigger, and the GMSC sends an ANLYZD message to the SCP. The analysis message includes at least the trigger type set to Initial_Termination, the calling number, the called number, and the MSCID of the called trigger location;

Step 504: The SCP analyzes the called number in the ANLYZD message and obtains that the called user has registered the ring-back tone service, and then judges that the RBTFlag used to identify the number of service triggers is 1, and then the SCP returns RBTFlag as 0; wherein, RBTFlag The function is to distinguish between the first service trigger and the second service trigger. The initial value of RBTFlag is 0. When the first service trigger is performed, RBTFlag is set to 1, and when the second service trigger is performed, RBTFlag is set to 1. The value of RBTFlag is set to 0, on the one hand, it is used to identify the second trigger, and on the other hand, the RBTFlag is returned to the initial value to meet the needs of the next ring-back tone service;

Step 505: The SCP sends the response message of the ANLYZD message in step 503 to the GMSC; wherein, for ordinary users, the SCP directly sends the response message; Sending the response message, in the embodiment of the present invention, a direct sending method is adopted;

Step 506: According to the fixed configuration in the call flow, the called GMSC detects the Location trigger at this time, triggers the trigger, and sends a LOCREQ message to the HLR, so as to obtain the routing information of the called user from the HLR, wherein, in this step, the LOCREQ The trigger type of the message is a Location trigger;

Step 507: Since in the embodiment of the present invention, the GMSC as the service trigger is different from the MSC visited by the called user, therefore, the HLR judges to obtain the service trigger according to the MSCID of the second service trigger GMSC in the obtained LOCREQ message The MSCID of the locality is different from the MSCID of the MSC of the called user's current visiting place stored on the HLR itself, so the HLR sends a routing request message (ROUTREQ) to the called user's current visiting MSC, which includes the mobile identification code of the called user (MIN), the MSC of the current visiting place of the called user distributes the TLDN number for the called user according to the MIN, and returns to the HLR through the response message of the ROUTREQ message, and the HLR returns the TLDN number to the GMSC through the response message of the LOCREQ message;

Steps 508 to 509: According to the call flow, the GMSC triggers the Called_Address_Available trigger, and after judging that the called number is valid, sends an ANLYZD message to the SCP, and the called routing number parameter in the message is set to the TLDN obtained in step 507 , sending a response message of the ANLYZD message to the GMSC, instructing the GMSC to continue call processing;

Step 510～step 512:

According to the TLDN number in the IAI message, the GMSC sends an IAI message to the MSC in the place where the called user is currently visiting, thereby connecting the call to the MSC in the place where the called user is currently visiting, and the MSC then sends a call setup call to the mobile station (MS) of the called user and ringing message (Setup&Alert), so as to connect the call to the called MS. After the call is connected to the called MS, the MSC at the place where the called user is currently visiting returns an ACM message to the GMSC, indicating that the call has been connected; wherein, the ACM can indicate Whether the user is on a call at the time;

The GMSC forwards the ACM to the RBTS; the RBTS analyzes the information of the ACM and judges whether the user is currently in a talking state or an idle state. According to the judgment result and the ring-back tone service customized by the user, the call path between the called user and the called user is temporarily disconnected. If not, play a ringback tone to the calling party;

Step 513: The called user picks up the phone, the MSC at the called site sends an answer message (ANM) to the GMSC, and the GMSC sends an answer message (ANM) to the RBTS, and the RBTS stops playing the ring back tone, and connects the calling user and the called party. voice channel between users;

Step 514: The GMSC reports a TANSWER message to the SCP, instructing the SCP to start charging, and then a normal conversation between the calling party and the called party starts.

In this embodiment, since the MSCID of the MSC where the called user is currently visiting is not obtained during the first service trigger process, the call can only be routed to the GMSC at the end of the first trigger process, resulting in the second trigger Compared with Embodiment 1, the procedure increases the detour of the voice channel, but the embodiment of the present invention can still realize the ring back tone service, and has the same technical effect as Embodiment 1.

Example 3:

Referring to Figure 6, the two triggering processes in the embodiment of the present invention are combined and completed, specifically including:

Step 601:

The calling user initiates an incoming call on the calling service MSC in the CDMA network. The incoming call is a call made to the called user who has subscribed to the ring-back tone service, and the call content includes at least the calling number and the called number; wherein , when the calling user is a CDMA user, the serving MSC is the MSC of the place visited by the calling user, and when the calling user is a user of other communication networks including fixed network and GSM, the serving MSC is the GMSC of the CDMA system;

Step 602:

The serving MSC receives the incoming call, judges that the called user is a CDMA user according to the called number in the incoming call, triggers the mobile phone called (Mobile_Termination) trigger, and triggers the called process of the mobile phone, so that the serving MSC sends a location request (LOCREQ) message to HLR, to request to obtain the subscription information of the called user on the HLR, wherein, at least include the called user identifier, the serving MSC identifier (MSCID), and the trigger type that is set to Mobile_Termination in the location request message ;

Step 603:

HLR receives the LOCREQ message, searches for the subscription information of the called user on itself according to the called user identification in the message, and then, the HLR returns a LOCREQ response message to the serving MSC, which at least includes the subscription information of the called user Information about the initial termination trigger (Initial_Termination) in the message, if the called user is a smart user, the message further includes trigger information such as Location, Called_Routing_Address_Available;

Step 604:

The serving MSC triggers the Initial_Termination trigger, and sends an analysis information (ANLYZD) message to the SCP. The analysis message includes at least the trigger type set to Initial_Termination, the calling number, the called number, the identity of the serving MSC (MSCID), and the service trigger location information;

Step 605:

The SCP receives the ANLYZD message described in step 604, judges whether the area where the serving MSC is located supports the ring-back tone service according to the MSCID of the service in the message, if not, then completes the call process according to the ordinary call service flow, otherwise, the SCP The called number in the received ANLYZD message, checks whether the called user has registered the ring-back tone service in its own database, if not, then completes the call according to the normal call service flow, otherwise, the SCP returns the ANLYZD response message to the serving MSC, Wherein, the response message includes an Advanced_Termination trigger and a Called_Routing_Address_Available trigger, and the Advanced_Termination trigger is used to modify the called number in subsequent steps;

Step 606:

The serving MSC receives the response message in step 605, triggers the Advanced_Termination trigger, and sends an ANLYZD message to the SCP to instruct the SCP to modify the called number in the call, wherein the trigger type of the ANLYZD message is Advanced_Termination;

Step 607:

SCP sends the response message of the ANLYZD message described in step 606 to the serving MSC, including the forwarding number in the response message, and this number is passed through the variable TermList, and its format is:

TermList=ringback tone service routing number (RTDGT)+called user MDN; Wherein, RTDGT represents the routing position of RBTS, and MDN is the called user number included in the incoming call;

Steps 608-609:

The serving MSC triggers the Called_Address_Available trigger, and after judging that the called number is valid, sends the ANLYZD message to the SCP, and sends the response message of the ANLYZD message to the MSC;

Step 610:

The serving MSC analyzes that the call needs to be routed to the RBTS according to the RTDGT in the forwarded-to number, and the serving MSC sends an IAI message to the RBTS; wherein, the called number in the IAI message is: RTDGT+MDN;

Step 611:

Because in the embodiment of the present invention, RBTS supports the LOCREQ operation in the Mobile Application Part (MAP) agreement of CDMA, therefore, RBTS sends LOCREQ message to HLR, so that obtain the routing information of called user from HLR; The visited MSC sends a routing request message (ROUTREQ), which includes the mobile identification code (MIN) of the called user. The called user's current visited MSC assigns a TLDN number to the called user according to the MIN, and the response of the ROUTREQ message The message is returned to the HLR, and the HLR returns the TLDN number to the RBTS through a LOCREQ response message;

Step 612:

According to the obtained TLDN number, the RBTS sends an IAI message to the MSC of the currently visited place of the called user, and routes the call to the MSC of the currently visited place of the called user; wherein, the called number in the IAI message is the TLDN number;

Step 613:

The MSC in the place where the called user is currently visiting sends an ACM message to the RBTS, and the RBTS analyzes the ACM message, and plays different ring-back tones according to the ring-back tone service customized by the user and according to the idle or busy status of the called user, and at the same time , the RBTS cuts off the call path with the called user;

Step 614:

When the called user picks up the phone, the RBTS receives the ANM message sent by the MSC in the place where the called user is currently visiting, stops playing the ringback tone, and connects the call between the calling party and the called party;

Step 615:

The RBTS reports a TANSWER message to the SCP, instructing the SCP to start charging, and then the calling party and the called party start a normal conversation.

In the embodiment of the present invention, since the RBTS supports the MAP operation of CDMA, it can perform, for example, send a LOCREQ operation to the HLR to obtain the TLDN number of the called user. Secondary service triggering, after the call is routed to the RBTS, the call can be directly routed to the MSC of the called user's current visit through the RBTS. However, because in the embodiment of the present invention, the RBTS is required to support the MAP operation, the requirements for the RBTS are increased.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (5)

1, a method for realizing ring-back tone service in a code division multiple access system, is characterized in that the method comprises: A. The calling user dials the number of the called user, the serving MSC receives the incoming call request, and the serving MSC obtains the subscription information of the called user from the HLR according to the called number in the incoming call request; B. The serving MSC triggers an intelligent call process according to the obtained subscription information of the called user, and routes the call to the RBTS; C. The RBTS routes the call to the MSC at the place where the called user is currently visiting, and the MSC at the place where the called user is currently visiting returns a message including the current working status information of the called user to the RBTS, and the RBTS receives the current working status of the called user in the message , play a ringback tone for the calling user, and at the same time, the RBTS cuts off the call with the MSC in the place the called user is currently visiting; D. When the called user picks up the phone to answer, the MSC in the place where the called user is currently visiting sends a response message to the RBTS, and the RBTS connects the call between the calling user and the called user, and stops playing the ringback tone at the same time. 2. The method according to claim 1, wherein step B comprises: B1. The serving MSC detects that the called process has triggered the trigger in the subscription information, and sends an analysis message to the SCP. The SCP analyzes whether the service trigger supports the ring-back tone service according to the content in the analysis message. If not, follow the general The call processing process completes the call service, otherwise, execute step B2; B2, SCP judge whether the ring back tone service has been triggered, if so, then complete the call service according to the general call processing process, otherwise, the mark ring back tone service is triggered for the first time; B3. The SCP sends an advanced-termination trigger to the serving MSC. The serving MSC detects that the called process triggers the trigger and sends an analysis message to the SCP; B4, SCP obtains the routing position of the MSC of the current visiting place of the called user from the HLR by querying; B5. The SCP sends the forwarding number to the serving MSC, wherein the forwarding number includes the RBTS routing address, the MSC routing location of the called user's current visit, and the content of the called number. The serving MSC uses the forwarding number as the called party in the call. call number; B6. The serving MSC routes the call to the RBTS according to the current called number; Said in step C, the RBTS routing the call to the MSC of the called user's current visit includes: C1. The RBTS routes the call to the MSC of the MSC currently visited by the called user according to the routing location of the MSC of the MSC currently visited by the called user in the forwarding number; C2. The MSC at the place where the called user is currently visiting obtains the subscription information of the called user through the HLR, triggers a trigger in the subscription information, and sends an analysis message to the SCP; C3, SCP receives the analysis message, judges whether the ring back tone service has been triggered for the first time, if so, then clears the mark that the ring back tone service is triggered for the first time, and executes other functions except the ring back tone service Intelligent service, then execute step C4; Otherwise, return to step B3, execute the ring back tone service; C4. The SCP instructs the MSC of the currently visited place of the called user to send location request information to the HLR. The HLR judges that the MSC sending the location request is the same as the MSC of the called user's current place of visit according to the location request information, and directly sends the MSC of the currently visited place of the called user. Return the MSCID of the MSC that the called user is currently visiting. The MSC of the called user’s current visiting location analyzes that its own MSCID is the same as the obtained MSCID of the called user’s current visiting location, and directly assigns a TLDN to the called party, and triggers the triggering of the availability of the called routing address. send analysis information to the SCP, and the SCP instructs the MSC to continue call processing. 3. The method according to claim 2, characterized in that the execution order of said step B3 and step B4 is interchanged. 4. The method according to claim 1, wherein step B comprises: B11, the serving MSC triggers the trigger in the user's subscription information, sends an analysis message to the SCP, and the SCP analyzes whether the service trigger supports the ring-back tone service according to the content in the analysis message, if not, then completes the call according to the general call processing process business, otherwise, go to step B12; B12, SCP judge whether the ring back tone service has been triggered, if yes, then complete the call service according to the general call processing procedure, otherwise, mark the ring back tone service as triggering for the first time; B13, the SCP issues an advanced-termination trigger for the serving MSC, the serving MSC triggers the trigger, and sends an analysis message to the SCP to notify the SCP to modify the called number on the serving MSC; B14. The SCP sends the forwarding number including the RBTS routing address and the called number content to the serving MSC, and the serving MSC uses the forwarding number as the called number in the call; Said in step C, the RBTS routing the call to the MSC of the called user's current visit includes: C11, RBTS routes the call to the called GMSC; C12, the called GMSC obtains the subscription information of the called user through the HLR, triggers the trigger in the subscription information, and sends an analysis message to the SCP; C13, SCP receives analysis message, judges whether the ring back tone service has been triggered for the first time, if so, then clears the mark that the ring back tone service is triggered for the first time, and executes other functions except the ring back tone service Intelligent service, then execute step C14; Otherwise, return to step B13, execute the ring back tone service; C14. The SCP instructs the called GMSC to send location request information to the HLR. The HLR obtains the TLDN of the MSC where the called user is currently visiting and returns it to the called GMSC. After the GMSC judges that the TLDN is valid, it sends an analysis message to the SCP, and the SCP returns the analysis message The response message indicates that the GMSC continues to process the call, and the GMSC routes the call to the MSC where the called user is currently visiting. 5. The method according to claim 1, wherein when the RBTS supports the LOCREQ operation in the MAP protocol in CDMA, step B comprises: B21, the serving MSC triggers the trigger in the user's subscription information, sends an analysis message to the SCP, and the SCP analyzes whether the service trigger supports the ring-back tone service according to the content in the analysis message, if not, then completes the call according to the general call processing process business, otherwise, go to step B22; B22, SCP issues triggers including advanced-termination trigger, called routing address available trigger, and location trigger for serving MSC, and serving MSC triggers advanced_termination trigger, and sends an analysis message to SCP to notify SCP to modify the service Called number on MSC; B23. The SCP sends the forwarding number including the RBTS routing address and the called number content to the serving MSC, and the serving MSC uses the forwarding number as the called number in the call; B24. Using the called routing address available trigger, after the serving MSC determines that the current called number is valid, it sends an analysis message to the SCP, and the SCP returns a response message to the analysis message, instructing the serving MSC to continue call processing, and the serving MSC according to the current called number routing calls to RBTS; Said in step C, the RBTS routing the call to the MSC of the called user's current visit includes: By using the LOCREQ operation, the RBTS obtains the routing address of the MSC in the place where the called user is currently visiting through the HLR, and routes the call to the MSC in the place where the called user is currently visiting according to the routing address.

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