CN108260097B

CN108260097B - Method for solving roaming charging error during eSRVCC switching and eMSC

Info

Publication number: CN108260097B
Application number: CN201611249649.2A
Authority: CN
Inventors: 周忠良; 张聪; 黄梅英
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Group Henan Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Group Henan Co Ltd
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2020-07-31
Anticipated expiration: 2036-12-29
Also published as: CN108260097A

Abstract

The invention provides a method for solving the problem that roaming charging is mistakenly generated when eSRVCC is switched and an eMSC, the method comprises the steps that the eMSC receives a switching request which is sent by a base station and is used for switching UE from Vo L TE to GSM, the switching request comprises a user identification and switching type information, the eMSC obtains a proxy switch address different from the eMSC self switch address when the user identification is a non-local identification and the switching type information is an eSRVCC switching type, the eMSC sends a switching completion notice to an MME after circuit domain resource reservation is completed, the eMSC generates a switching ticket according to a time point corresponding to the switching completion notice, the switch address in the switching ticket is the proxy switch address, and the eMSC sends the switching ticket to a BOSS system so that the BOSS system can determine that the switching ticket does not generate roaming charge according to the proxy switch address in the ticket.

Description

Method for solving roaming charging error during eSRVCC switching and eMSC

Technical Field

The invention relates to a communication technology, in particular to a method for solving roaming charging error during eSRVCC switching and an eMSC.

Background

Vo L TE (Voice over L TE) is defined by 3GPP standard, L TE Voice solution based on IMS network through IMS network, mobile operators can not only seamlessly inherit traditional Voice and short message service, but also integrate Voice call with rich enhanced function, and provide diversified service.

Vo L TE is a voice solution for realizing service control as service access and IMS network through L TE network, as shown in fig. 1A:

1) service access L the TE network is an all IP network without a CS domain, and both data services and voice multimedia services are carried on L TE.

2) And (3) service control: the EPC network does not have a call control function for voice and multimedia services, and a service control function needs to be provided through the IMS network.

When UE moves between networks supporting VoIP service, the Continuity of the Voice service is maintained, the VoIP Voice service loaded in the original network is smoothly switched to a CS domain of a target network, and the terminal and the network support the following process to ensure the Voice Continuity of Vo L TE calling, namely when the terminal moves from a Vo L TE coverage area to a TD-SCDMA/GSM coverage area in the Vo L TE calling process, the Continuity of Voice is maintained through eSRCC (enhanced Single Radio Voice Call Continuity, evolved Mobile switching center) technology switching.

Based on the consideration of equipment utilization rate, the existing network operators mostly adopt centralized deployment to eMSC, namely a plurality of eMSC are intensively deployed in provincial cities, and when eRVCC switching occurs to Vo L TE users in non-provincial cities, the calls are switched to eMSC.

Currently, the eSRVCC switching mainly has the following problems:

for Vo L TE users in a non-provincial meeting city B, after eSRVCC switching occurs, a call is connected to eMSC (a plurality of eMSC in the provincial meeting are intensively arranged in a provincial meeting city A), so that a call ticket roaming to the provincial meeting city A is generated.

The prior art solves the problems and defects:

1) when a terminal is called from a CS network, the equipment for comprehensively deciding the service domain and the access domain in the mobile CS network judges whether the terminal is doubly registered or not, and executes a T-ADS flow decision access domain when the terminal is doubly registered.

2) By expanding H L R in a 2G/3G network and HSS in IMS, when a terminal is switched, H L R or HSS in a target network determines whether the terminal switched is the terminal of SRVCC type or not according to the type information of the terminal, and when the terminal is determined to be the terminal of SRVCC type, the HSS or H L R in a source network is indicated to delete the registration and attachment information of the terminal in the source network, so that the terminal of SRVCC type can only access one network at the same time point, thereby avoiding the situation of pseudo dual standby and being incapable of completely solving the problems of roaming and charging sorting.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the method for solving the problem that the roaming charging is mistakenly generated during the eSRCC switching and the eMSC, and can quickly and efficiently solve the problem that the roaming call ticket is mistakenly generated during the eSRCC switching and cannot be sorted.

In a first aspect, the present invention provides a method for solving roaming charging error during eSRVCC handover, including:

the eMSC receives a switching request which is sent by a base station and is used for switching the UE from Vo L TE to GSM, wherein the switching request comprises user identification and switching type information;

the eMSC acquires a proxy switch address different from the switch address of the eMSC when the user identifier is a non-local identifier and the switching type information is an eSRVCC switching type;

after completing the circuit domain resource reservation, the eMSC sends a switching completion notification to the MME;

the eMSC generates a switching ticket according to a time point corresponding to the notification of the completion of the switching, wherein the switch address in the switching ticket is an agent switch address;

and the eMSC sends the switching bill to a BOSS system so that the BOSS system determines that the switching bill does not generate roaming charge according to the address of the proxy switch in the bill.

Optionally, when the subscriber identity is a non-local identity and the handover type information is an eSRVCC handover type, the step of obtaining a proxy switch address different from an eMSC own switch address includes:

when the switching type information is eSRVCC switching type, the eMSC sends a position acquisition request to the HSS, wherein the position acquisition request comprises: a user identification;

receiving the home location of the user identifier sent by the HSS by the eMSC, wherein the home location of the user identifier is searched by the HSS according to the position acquisition request;

the eMSC determines whether the user identifier is a non-local identifier according to the attribution of the user identifier;

correspondingly, when the eMSC determines that the user identifier is a non-local identifier, the step of acquiring the proxy switch address different from the eMSC self switch address is executed.

Optionally, the step of obtaining a proxy switch address different from the self-switch address of the eMSC includes:

and selecting an agent switch address different from the self switch address of the eMSC from a prestored switch address list, wherein the agent switch address is the agent switch address which is allocated to the UE by the eRVCC and is used when a switching ticket is generated.

Optionally, after the step of acquiring a proxy switch address different from the self switch address of the eMSC when the subscriber identity is the non-local identity and the switching type information is the eSRVCC switching type, the method further includes:

if the current service of the UE is a local access service, the eMSC sends a location update request to the HSS, wherein the location update request comprises: the HSS checks whether the proxy switch addresses recorded in the HSS are consistent or not according to the user identification and the corresponding proxy switch addresses;

the eMSC receives a location update response sent by the HSS, wherein the location update response comprises location update success information when the proxy switch addresses are consistent.

Optionally, the location obtaining request, the location updating request, and the location updating response are all MAP layer messages.

Optionally, the handover request is a handover request from an eSRVCC packet domain to a circuit domain, where the handover request includes: eSRVCC handover type information and subscriber identification.

Optionally, after the eMSC completes the circuit domain resource reservation, the step of sending a handover completion notification to the MME includes:

the switching completion notification comprises a circuit domain resource reservation result.

In a second aspect, the present invention further provides a method for solving roaming charging error during eSRVCC handover, which is characterized in that the method includes:

when the current service of the UE is a local access service, the HSS receives a location update request sent by the eMSC, wherein the location update request comprises: a user identifier and a proxy switch address different from the eMSC self switch address;

the HSS checks whether the proxy switch address in the position updating request is consistent with the proxy switch address of the user identification recorded in the HSS or not according to the user identification;

if the location updating response is consistent with the location updating response sent by the HSS to the eMSC, the location updating response comprises location updating success information with consistent proxy switch address, and the eMSC interacts with the base station through the MME according to the location updating response so as to complete eSRVCC switching of the UE;

and when the proxy switch address in the position updating request is the non-local user identifier, the eMSC is an address used in a call ticket which is distributed to the UE and does not generate roaming charging and is switched by the eRVCC.

Optionally, before the step of receiving the location update request sent by the eMSC, the method further includes:

the HSS stores the addresses of the proxy switches corresponding to all the user identifications of the preset local services.

In a third aspect, the present invention further provides an eMSC, including a receiving module, configured to receive a handover request sent by a base station for enabling a UE to handover from Vo L TE to GSM, where the handover request includes a user identifier and handover type information;

an obtaining module, configured to obtain, when a user identifier is a non-local identifier and the switching type information is an eSRVCC switching type, an agent switch address different from an eMSC own switch address;

a sending module, configured to send a handover completion notification to the MME after the eMSC completes the circuit domain resource reservation;

the generation module is used for generating a switching ticket according to a time point corresponding to the switching completion notice, and the switch address in the ticket is an agent switch address;

and the sending module is also used for sending the switching bill to a BOSS system so that the BOSS system identifies the address of the proxy switch in the bill to determine that the switching bill does not generate roaming charge.

According to the technical scheme, the method for solving the problem that the roaming charging is mistakenly generated during eSRVCC switching and the eMSC are used, when the eMSC generates the call ticket, the address of the exchange is not filled in, but the address of the proxy exchange is marked, and the switching call ticket is marked to be not the roaming service, so that the BOSS system identifies the address of the proxy exchange in the call ticket to determine that the switching call ticket does not generate the roaming charge, and the problem that the roaming call ticket is mistakenly generated during eSRVCC switching and cannot be sorted can be quickly and efficiently solved.

Drawings

Fig. 1A is a schematic diagram of voice and multimedia service access in the prior art;

fig. 1B is a flowchart illustrating a method for solving a roaming charging problem caused by eSRVCC handover according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for solving a roaming charging problem caused by eSRVCC handover according to a fourth embodiment of the present invention;

fig. 3 is a signaling diagram illustrating a method for solving the problem of roaming charging caused by eSRVCC handover according to a fifth embodiment of the present invention;

fig. 4 is a schematic structural diagram of an eMSC according to a sixth embodiment of the present invention;

fig. 5 is a schematic structural diagram of an eMSC according to a seventh embodiment of the present invention;

fig. 6 is a schematic diagram of a system structure for solving the problem of roaming charging caused by eSRVCC handover according to an eighth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention.

At present, after eSRVCC switching occurs to Vo L TE users in non-provincial meeting cities, a call ticket roaming to the provincial meeting cities can be generated because a call is connected to eMSC (enhanced multimedia center service center), and the call ticket is not different from a common call ticket, so that a charging and accounting system cannot perform sorting and order removing processing.

Example one

Fig. 1B is a flowchart illustrating a method for solving roaming charging problem caused by eSRVCC handover according to an embodiment of the present invention.

Referring to fig. 1B, a method for solving roaming charging problem caused by eSRVCC handover in an embodiment of the present invention specifically includes the following steps:

101. the eMSC receives a handover request sent by the base station to handover the UE from Vo L TE to GSM.

In this step, the handover request includes: user identification and handover type information.

For example, the handover request is a handover request sent by the MME to the eMSC, specifically, a handover request from the eSRVCC packet domain to the circuit domain, where the handover request includes: eSRVCC handover type information and subscriber identification.

102. And the eMSC acquires a proxy switch address different from the switch address of the eMSC when the user identifier is the non-local identifier and the switching type information is the eRVCC switching type.

In this step, the eMSC selects a proxy switch address different from the eMSC own switch address from a list of stored preset switch addresses. While the switch address list of the conference-saving eMSC in the prior art only includes a self VRID (virtual route ID) list for allocating to the UE requesting the eSRVCC handover, in this embodiment, the switch address list of the conference-saving eMS also includes a proxy VRID different from the self VRID for allocating to the non-local UE requesting the eSRVCC handover.

For example, the eMSC adds the proxy switch address in such a way that the configuration parameter is a proxy switch address different from the eMSC own switch address, and the configuration enabling condition is that the handover type information of the handover request is determined as the eSRVCC handover type.

The eMSC can modify the self-defined virtual switch address line parameter, and add and configure a switch address parameter, wherein the configuration parameter is a proxy switch address different from the eMSC self switch address, and the proxy switch address is a public switch address set according to the format of the switch address. And meanwhile, the eMSC is also configured with an enabling condition, and when the switching request is judged to carry eSRVCC switching type information and a non-local user identifier, the proxy switch address is enabled, and the self switch address is not used. If the eMRCC switching type information is not carried in the switching request, the eMSC allocates the self switch address to the terminal.

103. And the eMSC sends a switching completion notice to the MME after completing the circuit domain resource reservation.

In this step, the switching completion notification includes the circuit domain resource reservation result. It can be understood that reserving circuit domain resources is a prerequisite for completing UE eSRVCC packet domain to circuit domain handover.

104. And the eMSC generates a switching ticket according to the time point corresponding to the notification of the completion of the switching, wherein the switch address in the switching ticket is the proxy switch address.

In this step, the eSRVCC packet switched to the circuit domain is switched from L TE to GSM, and then the circuit domain carries the charges, and the charges are charged according to the duration, and the Charging information is generated relatively dispersedly, and each network element can generate a ticket according to the role of the network element in the session and the obtained session information, and the CTF (Charging Trigger Function, a logic Function entity in the Charging process) of this case is embedded in the network element (such as network entity MSC, eMSC) of the MSCS (Mobile Switching Center Server), and the network element is responsible for generating the ticket.

For example, the eMSC starts charging at a time point corresponding to the notification of completion of the handover, generates a handover ticket, and the switch address field in the handover ticket is the proxy switch address and is also the switch address allocated to the UE.

105. And the eMSC sends the switching bill to a BOSS system so that the BOSS system determines that the switching bill does not generate roaming charge according to the address of the proxy switch in the switching bill.

In this step, each network element may send the generated call ticket to a BOSS (Business Operating support system), and the BOSS system performs association processing on the associated call ticket. In step 104, the eMSC sends the switching ticket to the BOSS system, and the switch address field in the switching ticket is the proxy switch address, so that the ticket when eSRVCC switching occurs at this time can be identified as a non-roaming ticket, and the BOSS system determines that the switching ticket does not generate roaming charges according to the proxy switch address in the switching ticket.

In the embodiment, when the call ticket is generated by the eMSC, the exchange address of the eMSC is not filled in, but the proxy exchange address is used for marking that the switching call ticket is not a roaming service, so that the BOSS system identifies the proxy exchange address in the call ticket to determine that the switching call ticket does not generate roaming cost, and the problem that the roaming call ticket cannot be sorted due to error generation during eSRVCC switching can be quickly and efficiently solved.

Example two

In an embodiment two of the present invention, all the steps of the above embodiment one are included, wherein step 102 of the above embodiment method further includes the following sub-steps not shown in the drawings, and the step 102 includes:

1021. when the switching type information is eSRVCC switching type, the eMSC sends a position acquisition request to the HSS, wherein the position acquisition request comprises: and (4) identifying the user.

In this step, when the switching type information in the switching request sent by the MME is the eSRVCC switching type, the eMSC sends a MAP layer message location acquisition request to an HSS (Home Subscriber Server).

1022. And the eMSC receives the home location of the user identifier sent by the HSS, wherein the home location of the user identifier is searched by the HSS according to the position acquisition request.

In this step, the HSS determines the home location of the subscriber identity according to the subscriber identity and returns the home location to the eMSC.

1023. And the eMSC determines whether the user identification is a non-local identification according to the attribution of the user identification.

1024. And when the eMSC determines that the user identifier is a non-local identifier, executing the step of acquiring the proxy switch address different from the switch address of the eMSC.

In this embodiment, step 1021-.

EXAMPLE III

The existing network local communication service means that the user can only register under the network of the home city and enjoy the service provided by the local equipment. Roaming restrictions for subscribers of the local access service are implemented based on the list of allowed roaming switches for the subscriber in the HSS. The subscriber of the local access service is opened, and the subscriber is only a local switch list in the HSS. Therefore, when the local general subscriber is switched by the eSRVCC to perform location updating, the switch list allowed to be registered by the subscriber in the HSS does not have the switch address of the eMSC in the province city, so that the registration fails, and subsequent services fail.

The prior art solves the problems and defects:

however, if the user roams to an area without L TE coverage under an eMSC switch in a province city, or the user terminal is set to turn off Vo L TE, because the address of the eMSC is already added in the HSS, i.e. the user is allowed to register under the eMSC switch, the result is that the hometown user can successfully register in a roaming city and can use the network and service of the roaming place, which violates the requirement that the home general user can only register in the home city network and enjoy the home service, thereby causing a new roaming problem.

It should be noted that, the foregoing first embodiment and second embodiment may not limit whether the service type is a local access service.

In the third embodiment of the present invention, all the steps of the first embodiment are included.

If the current service of the UE is the local access service, step 102 of the method according to the above embodiment further includes sub-steps a01 to a02, which are not shown in the following figures, where step 102 includes:

a01, eMSC sends a location update request to HSS, the location update request includes: the HSS checks whether the proxy switch addresses recorded in the HSS are consistent or not according to the user identification and the corresponding proxy switch addresses;

in this step, not only the local switch list but also the proxy switch address is included in the HSS. Specifically, when accessing the network, the HSS binds one more profile (user configuration) to the switch list allowed to be used corresponding to the user identifier, that is, an agent switch address, so that the HSS allows the UE to register under the agent switch address.

Furthermore, the HSS checks whether the proxy switch addresses recorded in the HSS are consistent according to the user identifier in the location update request and the corresponding proxy switch address, that is, checks whether the local subscriber has a preset proxy switch address.

A02, eMSC receives the location updating response sent by HSS, the location updating response includes the successful location updating information when the proxy exchange address is consistent.

When the HSS checks that the proxy switch address in the location updating request is consistent with the proxy switch address recorded in the HSS, the UE is allowed to register under the proxy switch address of the eMSC, and a location updating response including successful location updating is sent.

In this embodiment, by setting an eMSC proxy switch address (different from the self switch address VRID), in the eSRVCC switching process, the eMSC initiates a location UPDATE procedure to the HSS, and fills the switch address in the location UPDATE MAP UPDATE L OCATIONREQ message as the proxy switch address, so that the switch address recorded by the HSS after the location UPDATE is successful is the proxy switch address rather than the original switch address.

In addition, eMRCC switching and ordinary conversation processes are distinguished by adding eMRCC proxy switch addresses in addition to local switch addresses in an exchange address list of Vo L TE users for opening local services in the HSS, when eMRCC switching occurs to the local services, location updating can be successfully carried out according to the eMRSC proxy switch addresses stored in the HSS, subsequent services are normally used, and the problem that the registration process of the local services is limited in the switching process is thoroughly solved.

Example four

Aiming at the problem of the local service user, the invention provides a fourth embodiment.

Fig. 2 is a flowchart illustrating a method for solving roaming charging problem caused by eSRVCC handover according to a fourth embodiment of the present invention.

Referring to fig. 2, a method for solving the problem of roaming charging caused by error in eSRVCC handover in the fourth embodiment of the present invention specifically includes the following steps:

201. when the current service of the UE is a local access service, the HSS receives a location update request sent by the eMSC, wherein the location update request comprises: a subscriber identity and a proxy switch address different from the eMSC own switch address.

202. And the HSS checks whether the proxy switch address in the position updating request is consistent with the proxy switch address of the user identification recorded in the HSS or not according to the user identification.

In this step, the HSS checks whether the proxy switch addresses recorded in the HSS are consistent according to the user identifier in the location update request and the corresponding proxy switch address, that is, checks whether the local subscriber has a preset proxy switch address. If yes, go to step 203.

203. The HSS sends a location update response to the eMSC, wherein the location update response comprises location update success information with consistent proxy switch addresses, and the eMSC interacts with the base station through the MME according to the location update response to complete eSRVCC switching of the UE;

In addition, the local user does not have a preset proxy switch address in the HSS in step 202, and step 204, not shown, is performed.

204. And the HSS sends a location update response to the eMSC, wherein the location update response comprises rejection of the location update notification.

In this embodiment, before step 201, the method further includes: the HSS stores the addresses of the proxy switches corresponding to all the user identifications of the preset local services.

Through adding eMSC proxy switch address in addition to local switch address in HSS to the switch address list of VO L TE user for opening local service, eSRVCC switching and normal conversation process are distinguished, the problem that Vo L TE user for opening local service is registered in eSRVCC switching process, roaming is limited when roaming to area without L TE under provincial city eMSC switch or terminal is set to close Vo L TE is solved.

In addition, the local user can go to the area under the provincial city eMSC switch without L TE coverage, or the user terminal is set to close Vo L TE, because the HSS allows only the proxy switch address of the eMSC in the switch list registered by the user, and has no switch address of the eMSC, in the location updating flow under the scene, the location updating MAUPDATE L OCATION REQ message switch address initiated by the eMSC is the eMSC address, therefore, the local user can not register under the eMSC switch in the provincial city of the roaming place, which accords with the requirement that the local user can not register in the network of the roaming place and enjoy the service provided by the equipment of the roaming place.

The fourth embodiment solves the registration problem in the local access eSRVCC switching process, and the roaming limitation problem in the local access under the scene of closing the Vo L TE function or L TE no-coverage, and effectively improves the customer perception.

EXAMPLE five

For better understanding of the present invention, the following example five is specifically described.

In this fifth embodiment, when eSRVCC switching occurs, the eMSC determines that the eSRVCC switching occurs according to the switching request, initiates a location UPDATE procedure to the HSS, downloads user data, and fills the switch address of the MAP layer message in a location UPDATE MAP UPDATE L association REQ message as a proxy switch address, so that the switch address recorded by the HSS after the location UPDATE is successful is the proxy switch address instead of the original switch address.

And meanwhile, in the call ticket on the eMSC, the exchange address field of the user is recorded and filled as an eMSC proxy exchange address to replace the original exchange address of the eMSC, so that the call ticket when eRVCC switching occurs is marked as a non-roaming call ticket.

The fifth embodiment thoroughly solves the problem that a BOSS (bill of service) cannot sort roaming bills generated by a common Vo L TE user, and improves the perception of the user.

Fig. 3 is a signaling diagram illustrating a method for solving the problem of roaming charging caused by eSRVCC handover according to a fifth embodiment of the present invention.

As shown in fig. 3, the method for solving the problem of roaming charging caused by eSRVCC handover in the fifth embodiment is as follows.

301. And the UE-A moves to L TE coverage edge, the eNB issues measurement configuration, and the terminal measures the adjacent cell according to the instruction of the eNB and reports a measurement report.

Certainly, in practical applications, the terminal may periodically send a measurement report, that is, periodically monitor RSRP of the serving cell and the neighboring cell, determine that the RSRP reaches the handover threshold, and then send the measurement report to the eNB.

302. The eNB decides to initiate eSRVCC handover according to the content of the measurement report, and selects a target cell; and sending a switching request to the MME, wherein the message carries the ID of the target cell, and indicates that the switching is SRVCC switching through SRVCC HO Indication.

303. The MME judges that the switching is SRVCC switching according to the SRVCC HO Indication, and separates a voice media stream (QCI is 1) and other voice bearers in a switching session for subsequent switching; the MME selects an eMSC according to a target cell in the handover request message, and sends a handover request, specifically a handover request from an eSRVCC packet domain to a circuit domain, to the eMSC through an Sv interface via iWF (interworking unit), where the handover request includes: the eSRVCC handover type information (handover to SRVCC handover) and the subscriber identity may be the content of step 101 in the first embodiment.

And simultaneously, the MME informs the eMSC to initiate the resource reservation of the circuit domain side, and the message carries the STN-SR number which is allocated to the UE by the ATCF before. Other main parameters include subscriber identity (IMSI), C-MSISDN, Target cell identity (Target CellID) and transparently passed radio related information (Source to Target transferncontainer) from the Source eNB to the Target eNB to inform the Target system to prepare resources.

That is, the UE initiates a measurement report, and the eNB triggers a handover request and forwards it to the eMSC side through the MME.

304. The eMSC finds the VMSC from the own adjacent location area list according to the target cell, and sends a MAP layer message to carry out a switching preparation work request so as to inform preparation work before switching.

305. And the VMSC sends a relocation switching request message to the target BSC according to the target cell ID.

306. And the target BSC replies a relocation switching request response message after allocating the resources.

307. The VMSC returns a response message for preparing switching to complete the reservation of air interface resources.

308-312: and the eMSC and the VMSC carry out BICC coding and decoding negotiation to complete the reservation of the core network link resources.

And reserving resources for the UE-A according to the existing BICC bearer establishment mode.

Specifically, 308, the eMSC sends an Initial Address message (IAM, Initial Address message) to the VMSC, and sends a required Initial Address right request to the VMSC.

309. The VMSC replies an Access Parameters Message (APM) to the eMSC, wherein the Access Parameters Message comprises address right idle.

310. The eMSC establishes an Address according to the access parameter Message, and sends Address Complete Message information (ACM) to the VMSC.

311, 312, further, the VMSC replies APM message and ACM message to the eMSC, where the APM message and ACM message include parameters related to bearer, setup parameters of interworking message, mgw configuration parameters, etc., and BICC codec rules, etc. Thereby, the reservation of the core network link resources is completed.

That is, the eMSC initiates resource reservation to the VMSC and the 2G/3G wireless network, and coordinates and completes the switching of the wireless side.

313: the eMSC returns SRVCC handover to the MME through an Sv interface via iWF, responds from the PS domain to the CS domain to notify the MME of the resource reservation result, and carries the transparently transferred radio related parameters (Target to Source Transponder Container) from the Target eNB to the source eNB.

314: and if the resource reservation of the circuit domain side is finished, the MME sends a switching command message to the eNB, and the switching command message carries the Target energy transfer Container parameter.

And 315, the eNB informs the UE-A that the Target cell of the GSM can be switched from L TE according to the switching command sent by the Target to Source transfer Container parameter notice to the UE.

And the UE-A starts to execute a switching process according to the Target to Source transfer Container parameter, and sends a Handover from UTRONMATOPLETE message to the Target RNC after the UE air interface is switched to the GSM and successfully accesses the UTRAN system.

316-322: the target RNC sends HO Complete message to the VMSC, and informs MME of finishing switching after eMSC.

Specifically, 316, the target RNC sends relocation handover detection to the VMSC first, and if the detection result is that the handover is completed, the target RNC completes the relocation handover to the VMSC 317.

318. And the VMSC sends Map layer message processing access signaling to the eMSC.

319. The eMSC returns an answer message (ANM) after the eMSC processing is completed.

320. The VMSC sends a Map layer end signal to the eMSC.

321. The eMSC sends the PS domain to CS domain handover completion notification to the MME, which may be the content of step 103 in the first embodiment.

That is, the eMSC initiates a resource reservation application to the IMS network element, coordinates and completes a terminal monitoring measurement report, judges that a switching threshold is reached, initiates the measurement report to the eNB, triggers a switching request, and forwards the switching request to the eMSC side through the MME.

Next, the eMSC generates a switching ticket according to the time point corresponding to the sending of the switching completion notification, where the switch address in the switching ticket is the proxy switch address, which may be the content of step 104 in the first embodiment.

323. The eMSC sends SRVCC switching, and when the switching process of the access side is triggered by a request from a PS domain to a CS domain, an SIP INVITE (INVITE) message is also sent to a Proxy Call Session Control function (Proxy-Call Session Control function) of the P-CSCF/ATCF, the switching process of the Session layer is triggered, the message carries STN-SR and C-MSISDN obtained from the MME, and simultaneously carries SDPoint information (service data Point ) of the MSC side.

324. And the ATCF receives the INVITE message, judges that the message is generated by eSRVCC switching according to the STN-SR number, acquires the C-MSISDN from the INVITE message, and determines the Active state session needing to be switched by the UE-A by combining the locally stored + g.3gpp.srvcc identifier and eSRVCC related information (ATU-STI and the like). And returning the codec used after the original session negotiation to the codec used after the original session negotiation after judging that the codec list sent by the eSRVCC contains the codec used after the original session negotiation.

And simultaneously, the ATCF carries out media negotiation modification, newly establishes a media endpoint and completes connection with an eSRVCC side endpoint. And returning the eMSC OK message, and carrying SDP information of the newly-built endpoint of the home terminal.

325. The eMSC sends the received response to the ATCF.

Next, step 326-329, the eMSC determines that it is eSRVCC switching, initiates a location UPDATE procedure to the HSS, downloads subscriber data, and fills the switch address of the MAP layer message as a proxy switch address in the location UPDATE MAP UPDATE L association REQ message, so that the switch address recorded by the HSS after the location UPDATE is successful is the proxy switch address instead of the original switch address.

Specifically, if the current service of the UE is the local access service, according to the first embodiment, the third embodiment, and the fourth embodiment, the following steps 326 and 329 are performed.

326. The eMSC initiates a location update to the HSS, the location update request comprising: the subscriber identity and the proxy switch address, so that the HSS records the subscriber identity and the corresponding proxy switch address, which may be the content of step a01 in the second embodiment.

327. The location update response sent by the HSS, which includes the location update success information when the addresses of the proxy switches are consistent, may be the content of step a02 in the second embodiment.

328. The eMSC returns a message indicating that the user data is received, specifically, the user data is inserted, and the user data is a proxy switch address different from the switch address of the eMSC.

329. And the HSS sends a location updating success response, wherein the location updating response comprises location updating success information.

It should be noted that, according to the first and second embodiments, the following steps 326-329 are performed.

326. The eMSC initiates a location update to the HSS, the location update request comprising: the user identifier, specifically, the location update request sent for obtaining the location, may be the content of step 1021 in the second embodiment.

327. The location update response sent by the HSS, which returns the user identifier home location, may be the content of step 1022 in embodiment two.

328. The eMSC return indicates receipt. The eMSC sends a response to the HSS when the ue identifier is a non-local identifier, where the response is to insert the ue data, where the ue data is a proxy switch address different from the self-switch address of the eMSC, and may be the contents of steps 1023 and 1024 in the second embodiment.

In summary, the first to fifth embodiments have at least the following technical effects:

1) the concept of adding the proxy switch address at the eMSC side is innovatively provided, only the switch address in the initiated position updating request is filled as the proxy switch address, and the switch address field of the user registration in the charging call ticket generated by the eRVCC switching process is filled as the eMSC proxy switch address, so that the call ticket when the eRVCC switching occurs can be marked as a non-roaming call ticket, and the problem that the roaming call ticket cannot be sorted by mistake when the eRVCC of the Vo L TE user is switched is thoroughly solved.

2) The problem that the eMSC generates roaming call tickets mistakenly when the Vo L TE user eSRVCC is switched is effectively avoided, and the method plays a powerful role in improving user perception and maintaining company credit image.

3) The method has the advantages of no need of large-scale reconstruction of the existing network, simple and easy realization, and capability of quickly and efficiently solving the problem that the roaming call ticket can not be sorted by mistake when the eSRVCC of the Vo L TE user is switched.

4) For Vo L TE users for opening local service, in order to solve the problem of roaming restriction during eSRCC switching of Vo L TE users, a concept of adding proxy switch addresses on an eMSC side is provided on the basis of an eMSC side original position updating process, when the eMSC side determines and judges that the position is updated due to eSRCC switching process, the switch addresses of MAP layer messages are filled as proxy switch addresses in the initiated position updating messages, and the eSRCC switching and the common conversation process are distinguished by filling the proxy switch addresses of the eSRCC in cooperation with a switch address list for allowing roaming of Vo L TE users for opening the local service in an HSS, so that the problem that the eSRVCC switching of the Vo L TE users for opening the local service cannot be registered in the eSRCC switching process is effectively solved.

5) By distinguishing eSRVCC switching and a common call flow, the problem that a Vo L TE user opening local communication service roams to an area under an eMSC switch in a province city without L TE coverage or the roaming limitation is caused when a terminal is set to close Vo L TE is effectively solved.

6) The existing network is not required to be transformed in a large scale, the implementation is simple and feasible, and the registration problem when Vo L TE user eSRVCC of the local service is switched and the service restriction problem when the user roams can be thoroughly solved.

EXAMPLE six

Fig. 4 illustrates a schematic structural diagram of an eMSC according to a sixth embodiment of the present invention.

As shown in fig. 4, an eMSC provided in the sixth embodiment of the present invention includes:

a receiving module 41, configured to receive a handover request sent by a base station for enabling the UE to handover from Vo L TE to GSM, where the handover request includes a user identifier and handover type information;

an obtaining module 42, configured to obtain, when the user identifier is a non-local identifier and the switching type information is an eSRVCC switching type, an agent switch address different from an eMSC own switch address;

a sending module 43, configured to send a handover completion notification to the MME after completing the circuit domain resource reservation;

a generating module 44, configured to generate a switching ticket according to a time point corresponding to the switching completion notification, where an exchange address in the switching ticket is an agent exchange address;

and the sending module 43 is further configured to send the handover ticket to the BOSS system, so that the BOSS system determines that the handover ticket does not generate roaming charges according to the address of the proxy switch in the ticket.

In the present embodiment, the six eMSC executes the foregoing method embodiments, and the functional principle and technical effect are not described in detail.

EXAMPLE seven

Fig. 5 illustrates a schematic structural diagram of an eMSC according to a seventh embodiment of the present invention.

An eMSC according to a seventh embodiment of the present invention, as shown in fig. 5, includes: a processor (processor) 51, a memory (memory)52, a communication Interface (Communications Interface)53, and a bus 54;

the processor 51, the memory 52 and the communication interface 53 complete mutual communication through the bus 54;

the communication interface 53 is used for information transmission between the eMSC and other devices;

the processor 51 is configured to call the program instructions in the memory 52 to execute the above method embodiments, for example, including:

and the eMSC sends the switching bill to a BOSS system so that the BOSS system determines that the switching bill does not generate roaming charge according to the address of the proxy switch in the switching bill.

The seven eMSC of the present embodiment executes the foregoing method embodiments, and the functional principle and technical effect are not described in detail.

Example eight

Fig. 6 illustrates a system for solving the problem of roaming charging caused by eSRVCC handover according to an embodiment of the present invention.

The system for solving the problem of roaming charging caused by error in eSRVCC switching comprises the following steps: UE, ENB, MME, BSC, VMSC, eMSC, HSS, and ATCF.

In the eighth embodiment, the eMSC interacts with other network elements to execute the foregoing method embodiments, and the functional principle and technical effect are not described in detail.

Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.

Those skilled in the art will appreciate that the steps of the embodiments may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for solving roaming charging error generated during eSRVCC switching is characterized by comprising the following steps:

2. The method of claim 1, wherein the step of obtaining a proxy switch address different from the eMSC own switch address when the subscriber identity is a non-home identity and the handover type information is an eSRVCC handover type comprises:

3. The method of claim 1, wherein after the step of obtaining a proxy switch address different from the eMSC own switch address when the subscriber identity is a non-home identity and the handover type information is an eSRVCC handover type, the method further comprises:

4. The method of any of claims 1-3, wherein the step of obtaining a proxy switch address that is different from the eMSC native switch address comprises:

and selecting an agent switch address different from the self switch address of the eMSC from a prestored switch address list, wherein the agent switch address is the agent switch address which is allocated to the UE by the eRVCC and is used when the switching ticket is generated.

5. The method of claim 2, wherein the location acquisition request is a MAP layer message.

6. The method of claim 3, wherein the location update request and the location update response are both MAP layer messages.

7. The method according to any one of claims 1 to 3,

the switching request is a switching request from an eSRVCC packet domain to a circuit domain, and the switching request comprises: eSRVCC handover type information and subscriber identification.

8. The method according to any of claims 1-3, wherein the step of the eMSC sending a handover complete notification to the MME after completing the circuit domain resource reservation comprises:

9. An eMSC, comprising:

a receiving module, configured to receive a handover request sent by a base station for enabling the UE to switch from Vo L TE to GSM, where the handover request includes a user identifier and handover type information;

a sending module, configured to send a handover completion notification to the MME after completing the circuit domain resource reservation;

the generation module is used for generating a switching ticket according to a time point corresponding to the switching completion notice, and the switch address in the switching ticket is an agent switch address;

and the sending module is also used for sending the switching bill to a BOSS system so that the BOSS system determines that the switching bill does not generate roaming charge according to the address of the proxy switch in the bill.