CN102932774B - A kind of method and HLR suppressing T-CSI business - Google Patents

Abstract

The invention discloses a method for suppressing T-CSI services, which comprises the following steps: 1) HLR receives the SRI message sent by GMSC; 2) HLR triggers and executes the domain selection of the called user with a common number according to the SRI message, and judges that the 3) If it is judged that the common number should select to answer the call in the IMS domain, the HLR suppresses the T-CSI, and returns an SRI_Ack message that does not carry the T-CSI service information to the GMSC. The present invention optimizes the signaling waste when the HLR in the 2G/3G network selects the CCP number domain and lands only in the IMS domain, and the signaling waste when the service is triggered in the IMS domain although it lands in the CS domain , improving network performance.

Description

A method of suppressing T-CSI service and HLR

technical field

The invention relates to a service triggering method in the communication field, in particular to a method for suppressing T-CSI service and an HLR.

Background technique

In the existing 2G/3G network, generally the CS domain and the PS domain are used to carry voice and data services respectively. However, the future LTE or 4G network only has the PS domain and no longer includes the CS domain, so future voice services will be carried by the LTE core network (EPC network). However, the EPC network itself does not have the voice switching and The IP multimedia system IMS on the EPC network undertakes all services. During the evolution from 2G/3G to 4G, 2G/3G networks and LTE networks will coexist for a long time. Most operators in the world will have multiple voice switching networks for a long time. In order to ensure the continuity of user resources and the consistency of user experience, a number sharing scheme has been proposed as a solution.

The so-called shared number is a solution for sharing the same set of code numbers when the operator has multiple voice switching networks, that is, mobile phone users can continue to retain the original 2G/3G user numbers and use them in the LTE network. In the common number scheme, the same code number can reside in multiple core networks at the same time or separately. For example, users who subscribe to CS domain and IMS domain at the same time and use the same number in these two domains are called shared-number users. Shared-number users require terminals that can be registered or attached to different wireless networks. Among them, at a certain point in time, a shared number user who only registers or attaches to one network and uses the service is called a single standby user.

For users with shared numbers, there is a problem of called domain selection. For example, for a user who has a common number in the CS domain and the IMS domain, it is necessary to solve the problem of network selection for the called user in the CS domain and the IMS domain.

MAP (MobileApplicationProtocol) agreement is the interface agreement between GMSC and HLR. Figure 1 is a standard procedure for obtaining user information in a CS domain in a 2G/3G network. As shown in Figure 1, when the mobile switching center GMSC in the CS domain receives a session request, it uses the SRI (MAP_SEND_ROUTING_INFORMATION) message in the MAP protocol to obtain the called user from the visitor location register VLR of the called user's visiting place through the home location register HLR business information and routing codes. After receiving the SRI message, the HLR will judge the subscriber's subscription information T-CSI (TerminatingCAMELSubscriptionInformation). If the subscriber has registered for the T-CSI service, the HLR will obtain the location information and status of the called subscriber by sending the "MAP_PROVIDE_SUBSCRIBER_INFORMATION" message data. HLR sends MAP_PROVIDE_ROAMING_NUMBER to VLR to obtain the user's roaming number, then, HLR returns the user's T-CSI and routing code to GMSC through SRIAck message, GMSC triggers T-CSI service through T-CSI, HLR can also query and return a result once .

Wherein, the internal processing flow after the HLR receives the SRI message is shown in FIG. 2 . According to the existing standard, after receiving the SRI message, the MAP message processing module in the HLR first checks the legality of the parameters in the SRI message, identifies the parameter indication, and then hands it over to the upper layer application module for corresponding processing logic. The SRI message handed over to the upper-layer application module for processing generally carries T-CSI service information, so the upper-layer application module will process the CSI subscription information when processing the SRI message; the processing result is returned to the MAP message processing module to generate SRIAck The message is returned to the GMSC, and the returned message generally includes MSRN routing information.

In related LTE standards, it is stipulated that the relevant service triggering of LTE single standby is controlled by the ICS in the IMS domain, and the AS service is triggered on the CSCF through the iFC. The resulting problem is: when an LTE single-standby user registers in the 2G/3GCS domain, according to the LTE network standard, the session needs to be triggered in the IMS domain, and finally returns to the CS domain for landing. This method has a lot of signaling Detours and network delays. When the same user is registered in the IMS domain, if a call is made for the user in the CS domain, the HLR will make a logical judgment on domain selection. Since the user is registered in the IMS domain, the result of this selection will land in the IMS domain , this session will trigger services in the IMS domain. According to 3GPP standard. Therefore, when a user initiates a session to a single standby user in the IMS domain in the CS domain, it is only a CS domain session to the GMSC, following the normal GMSC session flow, so the GMSC will obtain the user's balance information from the HLR, and send SCP triggers these services. But the HLR will instruct the GMSC to route to the IMS through the gateway office when the user lands in the IMS domain according to the selection result of the common number domain. The HLR will also return service trigger information according to the SRI request sent by the GMSC. At this time, for the GMSC, the T-CSI service will be triggered normally, and the session will be routed to the IMS domain. The session in the IMS domain will still trigger the service AS of the IMS domain. Obviously, the service information and processes triggered in the CS domain are wasted. up.

Contents of the invention

For the above-mentioned problem, the present invention will provide a kind of method and HLR of restraining T-CSI service, avoid when single standby user registers in IMS domain, the service process initiated by CS with said single standby user as called party causes Signaling is wasted.

In order to achieve the above object, the present invention provides a method for suppressing T-CSI services on the one hand, comprising the following steps:

1) HLR receives the SRI message sent by GMSC;

2) According to the SRI message, the HLR triggers and executes the domain selection of the called user with a common number, and judges the domain that the called user can receive;

3) If it is judged that the common number should choose to answer the call in the IMS domain, the HLR suppresses the T-CSI, and returns an SRI_Ack message that does not carry T-CSI service information to the GMSC.

Wherein, the shared number user is a single standby user registered in the IMS domain.

Wherein, the HLR suppressing T-CSI may specifically be canceling the T-CSI service information in the SRI information submitted by the MAP message processing module to the upper layer application module or canceling the T-CSI service information in the SRIAck information returned by the upper layer application module to the MAP message processing module. CSI business information.

In some embodiments of the present invention, the canceling of the T-CSI service information in the SRI information submitted by the MAP message processing module to the upper layer application module may be implemented as follows: After judging that the common number should be selected to receive calls in the IMS domain , skip the CSI_CHECK logic, and directly submit the SRI information that does not carry the T-CSI service information to the upper layer application module. In this manner, the MAP message processing unit no longer requests the T-CSI from the upper layer application module. Compared with the prior art, the upper layer application module no longer checks the T-CSI subscription information, and the SRIAck message returned to the MAP message processing module no longer carries T-CSI service information.

In another part of the embodiments of the present invention, canceling the T-CSI service information in the SRIAck information returned by the upper layer application module to the MAP message processing module may be implemented as: when the upper layer application module returns the SRIAck message to the MAP message processing module, Cancel the T-CSI service information in the response message, so that the SRIAck message returned by the HLR to the GSMC does not contain T-CSI, and replace the MSRN routing code information in the SRIAck message with the IMSRN routing code information. This process does not affect the existing service processing flow of the HLR, and only cancels the T-CSI in the SRIAck message returned by the upper layer application module to the MAP. Among them, the original MSRN indicating to route to other MSCs is replaced by the IMSRN indicating to route to the IMS domain, so that after receiving the SRIAck message, the GSMC will only route the call to the IMS domain.

Wherein, the judgment of the domain that the called user can be answered specifically includes: the HLR requests the IMS domain registration information and terminal capabilities of the called user to the HSS through a query message, and the HLR according to the registration information of the called user in the IMS domain and the CS domain, The terminal capability is used to judge and determine the user's listened domain.

According to another aspect of the present invention, the present invention also provides a kind of HLR that can restrain T-CSI business, it is characterized in that, described HLR comprises: MAP message processing module, is used for receiving and sending MAP between HLR and GMSC message; the domain selection module, used to trigger the execution of the domain selection of the called public number user according to the received SRI message, and judge the domain that the called user can be answered; the upper layer application module, used to process the SRI submitted by the MAP message processing module After the message is processed, return the SRIAck message to the MAP message processing module; the T-CSI suppression logic module is used to cancel the T-CSI service information in the SRI information submitted by the MAP message processing module to the upper layer application module or send the upper layer application module to The T-CSI service information is canceled in the SRIAck information returned by the MAP message processing module.

Wherein, the T-CSI suppression logic module is further configured to replace the MSRN routing code information in the SRIAck message with IMSRN routing code information.

Wherein, the domain selection module further includes: a query unit, used to request the HSS for the IMS domain registration information and terminal capabilities of the called user; Ability to determine the user's listened domain.

The present invention is aimed at the coexistence environment of 2G/3G network and LTE network, when a single standby user registers in the IMS domain and becomes a called user who initiates a call from the CS domain, through the SRI message processing process inside the HLR Adding the step of suppressing T-CSI and adding the corresponding functional modules in the HLR successfully optimized the HLR in the 2G/3G network. The signaling is wasted when the CS domain lands but the service is triggered in the IMS domain, which improves network performance.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is after CS receives session request in the prior art, GMSC obtains the standard signaling flow of called user information to VLR through HLR;

Fig. 2 represents the internal processing flow after the HLR receives the SRI message;

Fig. 3 is the flow chart of a preferred embodiment of the method for suppressing T-CSI traffic according to the present invention;

Fig. 4 is a schematic structural diagram of a system capable of suppressing T-CSI service HLR according to the present invention.

detailed description

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Before describing the present invention in detail, some terms involved in the present invention are explained first. In all the application documents of the present invention including the claims and the description, the single standby user refers to registering or attaching to only one core network and A shared number user terminal that can only use services on one network. The shared-number user refers to a user who has a unified mobile terminal number in multiple voice exchange networks of an operator.

The method for suppressing T-CSI provided by the present invention is proposed for such a problem: in the environment where the 2G/3G network and the LTE network coexist, a single standby user registers in the IMS domain of the LTE network. The CS domain of the /3G network initiates a call to the single standby user. According to the existing 3GPP standard, the GMSC will send a MAP-SRI message to the HLR, and the HLR selects the landing area of the called user and returns routing information to the GMSC. Therefore, in the embodiments described below, the called user with a common number refers to a single standby user registered in the IMS network. The method of the present invention is applicable to the call initiated in the CS domain as the single standby user.

The improvement of the present invention to the prior art is that a step of suppressing T-CSI is added in the process of processing the SRI message by the HLR, and a functional module for suppressing the T-CSI is added in the HLR. The method for inhibiting T-CSI and the HLR capable of inhibiting T-CSI will be described in detail below.

According to one aspect of the present invention, a method for suppressing T-CSI services is provided, as shown in Figure 3, comprising the following steps:

1. The HLR receives the SRI message sent by the GMSC.

When the user initiates a call in the CS domain, the GMSC at the calling side will send an SRI (MAP_SEND_ROUTING_INFORMATION) message to the HLR according to the MAP protocol, requesting the HLR to indicate subsequent routing information. This is a standard procedure in the prior art.

SendRoutingInformation is a request sent by the calling side GMSC to the called HLR to "request HLR to indicate subsequent routing information", which can be called "obtaining routing information" in Chinese

2. According to the SRI message, the HLR triggers the execution of the domain selection of the called user with the same number, and judges the domain of the called user that can be answered.

3GPP defines the process of called domain selection, which is partially described in TS23.221, 23.401, and 23.292. The user initiates a session in the CS domain, and the session triggers the domain selection logic in the HLR through the MAP message SRI. The HLR requests the IMS domain registration information and terminal capabilities of the called user from the HSS through a query message, and the HLR obtains the registration information of the CS domain. The domain selection logic judges and decides the domain to be answered of the user according to the registration information of the called user in the IMS domain and the CS domain, and terminal capabilities. Those skilled in the art should understand that the signaling process that the HLR requests the HSS for the IMS domain registration information and terminal capabilities of the called user through a query message belongs to the prior art. Wherein, the HLR obtaining the registration information of the CS domain can generally be understood in the prior art as the HLR obtains the registration information of the called user in the CS domain from the VLR, and this process is reflected in FIG. 1 . The HLR can also store the registration information of the user in the CS domain in itself. How the HLR obtains the user's registration information in the CS domain belongs to the prior art, and the present invention only involves the use of the registration information. In addition, those skilled in the art should be able to judge and determine the received domain of the user according to the registration information of the called user in the IMS domain and CS domain, and terminal capabilities. This can be realized in the prior art, and will not be described in detail below.

3. If it is judged that the common number should choose to answer the call in the IMS domain, the HLR suppresses the T-CSI, and returns an SRIAck message that does not carry T-CSI service information to the GMSC.

Through the analysis of the MAP protocol and the shared number process, we found that for the shared number account, if the result of the domain selection is to answer the call in the IMS domain, then the service in the CS domain does not need to be triggered. Therefore in the embodiment of the present invention, when HLR receives the SRI message that GMSC sends, first carries out the total number field selection judgment, if judge that described total number should select to answer the call in IMS domain, then suppress T-CSI, Finally, the SRIAck (MAP_SEND_ROUTING_INFORMATION_ack) message returned to the GMSC does not carry the T-CSI, so as to prevent the GMSC from triggering unnecessary intelligent network services. Wherein, the T-SCI is the intelligent network service subscription information stored in the HLR, and is used to instruct the GMSC how to trigger the intelligent network service. SRI_ack is a signaling of the MAP protocol, and it is a response to the SRI message, which contains "specific routing instructions". Generally, the message also carries a T-CSI instruction used to indicate the triggering of the intelligent network service. In the embodiment of the present invention, suppressing the T-CSI means that the SRIAck message returned by the HLR to the GMSC no longer carries T-SCI information, so that the GMSC no longer triggers the intelligent network service.

In addition, if the result of the domain selection is that the call can be received in the CS domain, the HLR triggers the corresponding service logic according to the relevant procedures in the prior art. Since suppression of T-CSI is not involved in this case, this part is outside the scope of the present invention.

In the existing HLR, the MAP message processing module is a logic unit responsible for receiving and sending the MAP message in the HLR. After HLR receives the SRI message, the MAP message processing module will submit SRI (Send_Routing_Info) information to the upper layer application module of HLR according to the MAP protocol to process the message, and the upper layer application module will put all the results into SRIAck( Send_Ronting_Info_ack), and then returned to the GMSC by the MAP message processing module. In the present invention, according to different timings for suppressing T-CSI, two specific implementations of suppressing T-CSI before and after submitting the SRI to the upper application module for processing are respectively provided.

In some embodiments of the present invention, after judging that the called user should answer the call in the IMS domain, the T-CSI check (CSI_CHECK) logic is skipped, and the SRI information without T-CSI service information is directly submitted to the upper layer application module. In this way, the HLR no longer requests T-CSI related information from its upper layer application module. Therefore, the SRIAck message returned to the MAP message module after being processed by the upper layer application module no longer contains T-CSI information. The complete processing process of SRI message in HLR is: MAP message processing module receives SRI message; When the IMS domain answers, the CSI_CHECK logic is skipped, and the MAP message processing module directly submits the SRI information that does not carry the T-CSI service information to the upper layer application module. The upper layer application module processes the SRI message, and returns the SRIAck message to the MAP message processing module after processing. The SRIAck message does not carry T-CSI service information.

In another part of the embodiments of the present invention, after judging that the called user should answer the call in the IMS domain, the SRI information is first submitted to the upper layer application module for processing, and then the upper layer application module returns the result to the MAP message processing module. The T_CSI information is eliminated, and an SRIAck message without T_CSI information is generated. At the same time, routing information IMSRN to the IMS domain is added to the SRIAck message. Now, the complete processing process of the SRI message in the HLR is: the MAP message processing module receives the SRI message; The module submits the SRI information to the upper-layer application module for processing according to the agreement; when it is judged that the called party should choose to answer in the IMS domain, cancel the T-CSI service information in the response SRIAck returned by the upper-layer application module to the MAP message processing module, and use the IMSRN information Replaces MSRN information in SRIAck. Finally, the MAP message processing module returns the SRIAck that does not carry T-CSI service information but has IMSRN information to the GMSC. Among them, the process of domain selection logic judging the available domain of the called number and the process of submitting the SRI message to the upper layer application module for processing by the MAP protocol are relatively independent, and they are smooth in no particular order.

Those skilled in the art should be able to understand that no matter whether T-CSI is suppressed in the SRI submitted by the MAP message processing module to the upper layer application module, or T-CSI is suppressed in the processing result returned by the upper layer application module to the MAP message processing module, they all It is based on the same idea, and ultimately the SRIAck message sent by the MAP message processing module to the GMSC does not carry T-CSI service information.

According to another aspect of the present invention, an HLR capable of suppressing T-CSI is also provided, as shown in FIG. 4 . Described HLR comprises: MAP message processing module, is used for receiving and sending MAP message between HLR and GMSC; Domain selection module, is used for according to the SRI message that receives, triggers and executes the domain selection of called common number user, judges The domain that can be answered by the calling user; the upper layer application module is used to process the SRI message submitted by the MAP message processing module and after processing, return the SRIAck message to the MAP message processing module; the T-CSI suppression logic module is used to process the MAP message The module cancels the T-CSI service information in the SRI information submitted by the upper layer application module or cancels the T-CSI service information in the SRIAck information returned by the upper layer application module to the MAP message processing module.

Wherein, the T-CSI suppression logic module is further configured to replace the MSRN routing code information in the SRIAck message with IMSRN routing code information.

In another embodiment of the present invention, the domain selection module further includes: a query unit, configured to request the HSS for the IMS domain registration information and terminal capabilities of the called user; The registered information and terminal capabilities of the CS domain are used to judge and determine the domain to be answered by the user.

Those skilled in the art should understand that the HLR also includes modules for implementing other functions. However, the improvement of the present invention to the HLR is limited to the above-mentioned modules involved in the method of the present invention, and these modules provide the method for realizing the suppression of the T-CSI service of the present invention. Therefore, for other modules in the HLR, the present invention will not describe in detail.

Claims (9)

1. suppress a method for T-CSI business, comprise the following steps:

1) HLR receives the SRI message that the GMSC of calling subscriber in CS territory sends;

2) HLR is according to described SRI message, triggers the territory performing called number user altogether and selects, judge that called subscriber's can be answered territory;

3) if judge that described number altogether should be selected to answer the call in IMS domain, then HLR suppresses T-CSI, and returns the SRI_Ack message of not carrying T-CSI business information to GMSC.

2. method according to claim 1, is characterized in that, described called number user is altogether the single standby subscriber in IMS domain registration.

3. method according to claim 2, it is characterized in that, cancel T-CSI business information in described HLR suppress T-CSI to be included in SRI information that MAP message processing module submits to upper application module or cancel T-CSI business information in the SRIAck information that returns to MAP message processing module in upper application module.

4. method according to claim 3, it is characterized in that, cancel T-CSI business information in the described SRI information submitted to upper application module in MAP message processing module specifically to comprise: judging that described number altogether should be selected after IMS domain answers the call, skip CSI_CHECK logic, submit to directly to upper application module and do not carry T-CSI business information SRI information.

5. method according to claim 3, it is characterized in that, describedly in the SRIAck information that upper application module returns to MAP message processing module, cancel T-CSI business information specifically comprise: when upper application module returns SRIAck message to MAP message processing module, cancel T-CSI business information in the response message, do not comprise T-CSI in the SRIAck message that HLR is returned to GSMC, and replace the MSRN route code information in described SRIAck message by IMSRN route code information.

6. the method according to any one of claim 1-5, it is characterized in that, described judgement specifically can being comprised by answering territory of called subscriber: HLR asks IMS domain log-on message and the terminal capability of called subscriber to HSS by query message, HLR judges to determine that user's is answered territory according to the log-on message of called subscriber in IMS domain and CS territory, terminal capability.

7. can suppress a HLR for T-CSI business, it is characterized in that, described HLR comprises:

MAP message processing module, for receiving and sending MAP message between HLR and GMSC;

Module is selected in territory, for the SRI message sent according to the GMSC of the calling subscriber received in CS territory, triggers the territory performing called number user altogether and selects, judge that called subscriber's can be answered territory;

Upper application module, the SRI message submitted to for the treatment of MAP message processing module is gone forward side by side after row relax, returns SRIAck message to MAP message processing module;

T-CSI suppresses logic module, for cancel T-CSI business information in the SRI information submitted to upper application module in MAP message processing module or return to MAP message processing module in upper application module SRIAck information in cancel T-CSI business information.

8. HLR according to claim 7, is characterized in that, described T-CSI suppresses logic module also for replacing the MSRN route code information in described SRIAck message by IMSRN route code information.

9. HLR according to claim 8, is characterized in that, described territory selects module also to comprise:

Query unit, for asking IMS domain log-on message and the terminal capability of called subscriber to HSS;

Determining unit, for judging to determine that user's is answered territory according to the log-on message of called subscriber in IMS domain and CS territory, terminal capability.