CN105592507B - Method, device and system for voice fallback - Google Patents

Method, device and system for voice fallback Download PDF

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Publication number
CN105592507B
CN105592507B CN201410572847.7A CN201410572847A CN105592507B CN 105592507 B CN105592507 B CN 105592507B CN 201410572847 A CN201410572847 A CN 201410572847A CN 105592507 B CN105592507 B CN 105592507B
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vlr
msc
request
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international roaming
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CN105592507A (en
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刘利锋
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ZTE Corp
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ZTE Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W40/00Communication routing or communication path finding
    • H04W40/02Communication route or path selection, e.g. power-based or shortest path routing

Abstract

The invention provides a method, a device and a system for voice fallback, wherein the method comprises the following steps: the international roaming gateway inquires whether the old and new mobile switching centers/visitor location registers MSC/VLR of the voice fallback network of the multimode terminal support the MTRR of the mobile terminal roaming retry according to the routing inquiry request; when the multimode terminal falls back to the 2G/3G network and the MSC/VLR supports MTRR, the international roaming gateway inquires whether the location updating process is finished; and under the condition that the international roaming gateway receives the end of the detection position updating process, initiating a request roaming number (PRN) to the newly registered MSC/VLR, solving the problems that the call completing rate of the voice fallback is not high and the connection error is easy to occur in the terminal cross-network international roaming process, improving the call completing rate of the voice fallback and reducing the error connection.

Description

Method, device and system for voice fallback
Technical Field
The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for voice fallback.
Background
Code Division Multiple Access (CDMA) is an important standard in third-generation mobile communication systems. CDMA commercial networks are currently established in north america, china, and some countries in asia.
Since the global scale of a CDMA network is much smaller than that of a global System for Mobile communications/Universal Mobile Telecommunications System (GSM/UMTS), when a CDMA user moves abroad, if there is no CDMA network coverage, it is impossible to implement an international roaming service. In order to meet the international roaming requirement of a user, a CDMA network operator generally deploys an international roaming gateway (FLR) to implement protocol conversion between ANSI-41MAP (american national Standards Institute-41Mobile Application Part) and GSM MAP, so as to provide a function of roaming between a GSM network and a CDMA network for a CDMA dual-mode (also referred to as a multi-mode) end user. In the service process of the dual-mode terminal user, the FLR plays roles of a mobile switching Center/visitor Location Register (MSC/VLR), a Short Message Center (SMC), a Home Location Register (HLR) network element of the GSM network, and roles of an MSC/VLR, an information Center (MC) and an HLR network element of the CDMA network, so as to implement roaming from the user to the GSM/UMTS.
Evolution to a fourth generation wireless data network (Long Term Evolution, abbreviated as LTE) is a trend for operators, and LTE networks are deployed in a plurality of countries currently. When a CDMA user using a dual-mode terminal with LTE capability roams internationally, the CDMA user may attach to the LTE network in the LTE network coverage area. Therefore, the problem of how to use voice services arises for applications when a user roams in an LTE network.
When a CDMA operator performs international roaming service, voice service is generally provided by a conventional 2G/3G network. Therefore, the FLR is required to support Mobile Terminal Roaming Retry (MTRR) and Mobile Terminal Roaming Forwarding (MTRF) of standard Circuit Switched Fallback (CSFB).
The LTE terminal with the CSFB capability is dropped to the 2G/3G network through the CSFB technology, and the traditional 2G/3G network provides voice services, but the call completing rate of the voice dropping is not high, and connection errors are easy to occur.
Aiming at the problems that in the related art, the call completing rate of voice fallback in the process of terminal cross-network international roaming is not high, and connection errors are easy to occur, no effective solution exists at present.
Disclosure of Invention
The invention provides a method, a device and a system for voice fallback, which are used for at least solving the problems that in the related art, the call completing rate of voice fallback is not high and connection errors are easy to occur in the cross-network international roaming process of a terminal.
According to an aspect of the present invention, there is provided a method of voice fallback, comprising: receiving a route query request of a home location register (HLRe) by an international roaming gateway, wherein the route query request is caused by a position query request initiated to the HLRe by a called multimode terminal in an international roaming state; the international roaming gateway inquires whether the new and old mobile switching center/visitor location register (MSC/VLR) of the multi-mode terminal voice fallback network supports mobile terminal roaming retry MTRR or not according to the routing inquiry request; under the condition that the multimode terminal falls back to a 2G/3G network and the MSC/VLR supports MTRR, the international roaming gateway inquires whether the location updating process is finished; and under the condition that the international roaming gateway receives the end of the detection position updating process, initiating a roaming number request (PRN) to the newly registered MSC/VLR.
Further, after the international roaming gateway queries whether the location update procedure is finished, and before the international roaming gateway initiates a roaming number request PRN to a newly registered MSC/VLR in a case that the international roaming gateway receives a detection that the location update procedure is finished, the method further includes: and waiting for the position updating process to be ended when the international roaming gateway receives and detects that the position updating process is not ended.
Further, the querying, by the international roaming gateway, whether the location update procedure is finished includes: and the international roaming gateway receives a routing information sending request sent by the network MSC and detects whether the location update of the new MSC/VLR of the multimode terminal is finished.
Further, the method further comprises: under the condition that the PRN carries a receiving roaming retry support parameter, the international roaming gateway responds to a request routing information SRI carrying a roaming retry mark of a gateway mobile switching center GMSC; and under the condition of the PRN transparent transmission, the international roaming gateway responds to the request routing information SRI of the gateway mobile switching center GMSC with a carried call reference number.
According to another aspect of the present invention, there is also provided a method of voice fallback, comprising: receiving a routing query request of an HLRe by an international roaming gateway, wherein the routing query request is caused by a position query request initiated to the HLRe by a called multimode terminal in an international roaming state; the international roaming gateway inquires whether the new MSC/VLR of the multi-mode terminal voice fallback network supports mobile terminal roaming forwarding MTRF or not according to the routing inquiry request; the multi-mode terminal falls back to the 2G/3G network and the international roaming gateway initiates a position canceling request to the old MSC/VLR under the condition that the MSC/VLR supports MTRF; wherein, the cancel location request carries MTRF support and authorization flag and new MSC/VLR number.
Further, after the international roaming gateway queries whether the new MSC/VLR of the voice fallback network of the multimode terminal supports the mobile terminal roaming forwarding MTRF according to the routing query request, the method further includes: under the condition that the multimode terminal falls back to a 2G/3G network and the MSC/VLR does not support MTRF, the international roaming gateway initiates a request for canceling the position to an old MSC/VLR; wherein, the cancel location request carries MTRF support and unauthorized mark and new MSC/VLR number.
According to another aspect of the present invention, there is also provided an apparatus for voice fallback, which is located in an international roaming gateway, including: a receiving module, configured to receive a route query request of a home location register HLRe, where the route query request is caused by a location query request initiated by a called multimode terminal in an international roaming state to the HLRe; the first supporting module is used for inquiring whether the new and old mobile switching centers/visitor location registers (MSC/VLR) of the voice fallback network of the multimode terminal support the mobile terminal roaming retry MTRR or not according to the routing inquiry request; the query module is used for querying whether the location updating process is finished or not under the condition that the multi-mode terminal falls back to the 2G/3G network and the MSC/VLR supports the MTRR; and the request module is used for initiating a roaming number request PRN to the newly registered MSC/VLR under the condition that the international roaming gateway receives the end of the detection position updating process.
Further, the apparatus further comprises: and the waiting module is used for waiting for the end of the location updating process under the condition that the international roaming gateway receives and detects that the location updating process is not ended.
Further, the first support module is further configured to detect whether location update of the new MSC/VLR of the multimode terminal is finished after receiving a routing information sending request sent by the network MSC.
According to another aspect of the present invention, there is also provided a voice fallback apparatus, located in an international roaming gateway, including: a receiving module, configured to receive a routing query request of an HLRe, where the routing query request is caused by a location query request initiated by a called multimode terminal in an international roaming state to the HLRe; the second supporting module is used for inquiring whether the new MSC/VLR and the old MSC/VLR of the voice fallback network of the multi-mode terminal support the roaming forwarding of the MTRF of the mobile terminal according to the routing inquiry request; a cancellation module, configured to initiate a location cancellation request to an old MSC/VLR when the multimode terminal falls back to a 2G/3G network and the MSC/VLR supports MTRF; wherein, the cancel location request carries MTRF support and authorization flag and new MSC/VLR number.
Further, comprising: the canceling module is also used for initiating a position canceling request to an old MSC/VLR under the condition that the multimode terminal falls back to a 2G/3G network and the MSC/VLR does not support MTRF; wherein, the cancel location request carries MTRF support and unauthorized mark and new MSC/VLR number.
According to another aspect of the present invention, there is also provided a system for voice fallback, comprising: the international roaming gateway comprises the voice fallback device.
According to the invention, an international roaming gateway is adopted to receive a routing query request of a home location register HLRe, wherein the routing query request is caused by a location query request initiated to the HLRe by a called multimode terminal in an international roaming state; the international roaming gateway inquires whether the new and old mobile switching center/visitor location register MSC/VLR of the multimode terminal voice fallback network supports the mobile terminal roaming retry MTRR or not according to the routing inquiry request; when the multimode terminal falls back to the 2G/3G network and the MSC/VLR supports MTRR, the international roaming gateway inquires whether the location updating process is finished; under the condition that the international roaming gateway receives the end of the detection position updating process, a roaming number request PRN is sent to the newly registered MSC/VLR, so that the problems that the call completing rate of voice fallback is low and connection errors are easy to occur in the cross-network international roaming process of the terminal in the related technology are solved, the call completing rate of the voice fallback is improved, and the error connection is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a first flowchart of a method of voice fallback according to an embodiment of the present invention;
FIG. 2 is a flow chart two of a method of voice fallback according to an embodiment of the present invention;
FIG. 3 is a block diagram of a first apparatus for voice fallback according to an embodiment of the present invention;
FIG. 4 is a block diagram of a device for voice fallback according to an embodiment of the present invention;
fig. 5 is a flowchart of a first embodiment of MTRRs after a voice fallback has successfully retrieved a roaming number in accordance with the preferred embodiment of the present invention;
fig. 6 is a flowchart of a second embodiment of MTRRs after a voice fallback has successfully retrieved a roaming number in accordance with the preferred embodiment of the present invention;
fig. 7 is a flowchart of a third embodiment of a voice fallback-already voice fallback reselecting MTRF of an MSC in accordance with the preferred embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In this embodiment, a method for voice fallback is provided, and fig. 1 is a first flowchart of a method for voice fallback according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:
step S102, the international roaming gateway receives a route inquiry request of a home location register HLRe, wherein the route inquiry request is caused by a location inquiry request initiated to the HLRe by a called multimode terminal in an international roaming state;
step S104, the international roaming gateway inquires whether the new and old mobile switching center/visitor location register MSC/VLR of the multi-mode terminal voice fallback network supports the mobile terminal roaming retry MTRR according to the routing inquiry request;
step S106, under the condition that the multimode terminal falls back to the 2G/3G network and the MSC/VLR supports MTRR, the international roaming gateway inquires whether the location updating process is finished;
step S108, when the international roaming gateway receives the end of the detected position updating process, it sends a roaming number request PRN to the new registered MSC/VLR.
Through the steps, the international roaming gateway inquires whether the old and new mobile MSC/VLR of the multi-mode terminal voice fallback network supports MTRR or not according to the route inquiry request; when the multimode terminal falls back to the 2G/3G network and the MSC/VLR supports MTRR, the international roaming gateway inquires whether the location updating process is finished; and when the international roaming gateway receives the end of the detection position updating process, the PRN is initiated to the newly registered MSC/VLR, so that the problems that the call completing rate of the voice fallback is not high and the connection error is easy to occur in the terminal cross-network international roaming process are solved, the call completing rate of the voice fallback is improved, and the error connection is reduced.
In this embodiment, when the international roaming gateway receives the detection that the location update procedure is not finished, it waits for the end of the location update procedure, and sends a roaming number request PRN to the newly registered MSC/VLR until the international roaming gateway receives the detection that the location update procedure is finished.
In this embodiment, the querying whether the location update procedure is finished by the international roaming gateway may include: the international roaming gateway receives a routing information sending request sent by the network MSC, and detects whether the location update of the new MSC/VLR of the multimode terminal is finished.
In this embodiment, when the PRN carries a receiving roaming retry support parameter, the international roaming gateway responds to the request routing information SRI of the gateway mobile switching center GMSC with a roaming retry flag; the international roaming gateway may also carry the call reference number in response to the request routing information SRI of the gateway mobile switching centre GMSC in case of transparent transmission of the PRN.
In this embodiment, a method for voice fallback is provided, and fig. 2 is a second flowchart of the method for voice fallback according to the embodiment of the present invention, as shown in fig. 2, the process includes the following steps:
step S202, the international roaming gateway receives a routing query request of the HLRe, wherein the routing query request is caused by a position query request initiated to the HLRe by a called multimode terminal in an international roaming state;
step S204, the international roaming gateway inquires whether the new MSC/VLR and the old MSC/VLR of the multi-mode terminal voice fallback network support the mobile terminal roaming forwarding MTRF according to the routing inquiry request;
step S206, the multi-mode terminal falls back to the 2G/3G network and the international roaming gateway sends a position canceling request to the old MSC/VLR under the condition that the MSC/VLR supports MTRF; wherein, the cancel location request carries MTRF support and authorization flag and new MSC/VLR number.
Through the steps, the international roaming gateway inquires whether the new and old MSC/VLR of the multi-mode terminal voice fallback network supports the mobile terminal roaming forwarding MTRF according to the routing inquiry request, the multi-mode terminal falls back to the 2G/3G network, and the international roaming gateway initiates a location canceling request to the old MSC/VLR under the condition that the MSC/VLR supports the MTRF; wherein, the cancel location request carries MTRF support and authorization flag and new MSC/VLR number. By the method, the problems that the call completing rate of the voice fallback is low and connection errors are easy to occur in the inter-network international roaming process of the terminal are solved, the call completing rate of the voice fallback is improved, and the number of wrong connections is reduced.
In this embodiment, after the international roaming gateway querying whether the new MSC/VLR of the multimode terminal voice fallback network supports mobile terminal roaming forwarding MTRF according to the routing query request, the method further includes: under the condition that the multimode terminal falls back to the 2G/3G network and the MSC/VLR does not support MTRF, the international roaming gateway initiates a location canceling request to the old MSC/VLR; wherein, the cancel location request carries MTRF support and unauthorized flag and new MSC/VLR number.
In this embodiment, a device for voice fallback is further provided, where the device is used to implement the foregoing embodiment and the preferred embodiments, and the description of the device that has been already described is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 3 is a block diagram illustrating a first apparatus for voice fallback according to an embodiment of the present invention, which is located in the international roaming gateway and includes a receiving module 32, a first supporting module 34, an inquiring module 36, and a requesting module 38, as shown in fig. 3.
A receiving module 32, configured to receive a route query request of a home location register HLRe, where the route query request is caused by a location query request initiated by a called multimode terminal in an international roaming state to the HLRe;
a first supporting module 34, configured to query, according to the route query request, whether the new or old mobile switching center/visitor location register MSC/VLR of the multimode terminal voice fallback network supports the mobile terminal roaming retry MTRR;
a query module 36, configured to query whether the location update procedure is finished when the multimode terminal falls back to the 2G/3G network and the MSC/VLR supports MTRR;
a request module 38, configured to initiate a roaming number request PRN to the newly registered MSC/VLR when the international roaming gateway receives the end of the detected location update procedure.
By the device, the international roaming gateway queries whether the old and new mobile MSC/VLR of the multi-mode terminal voice fallback network supports MTRR or not according to the route query request; when the multimode terminal falls back to the 2G/3G network and the MSC/VLR supports MTRR, the international roaming gateway inquires whether the location updating process is finished; and when the international roaming gateway receives the end of the detection position updating process, the PRN is initiated to the newly registered MSC/VLR, so that the problems that the call completing rate of the voice fallback is not high and the connection error is easy to occur in the terminal cross-network international roaming process are solved, the call completing rate of the voice fallback is improved, and the error connection is reduced.
In this embodiment, the apparatus further comprises: and the waiting module is used for waiting for the end of the location updating process when the international roaming gateway receives the detection that the location updating process is not ended.
In this embodiment, the first support module is further configured to detect whether location update of the new MSC/VLR of the multimode terminal is finished after receiving a routing information sending request sent by the local network MSC.
Fig. 4 is a block diagram of a second apparatus for voice fallback according to an embodiment of the present invention, as shown in fig. 4, the apparatus is located at an international roaming gateway, and includes a receiving module 32, a second supporting module 44, and a cancelling module 46, which will be described below.
A receiving module 32, configured to receive a route query request of the HLRe, where the route query request is caused by a location query request initiated by a called multimode terminal in an international roaming state to the HLRe;
a second support module 44, configured to query, according to the route query request, whether the old and new MSC/VLR and the new MSC/VLR of the voice fallback network of the multimode terminal support the mobile terminal roaming forwarding MTRF;
a cancellation module 46, configured to initiate a location cancellation request to the old MSC/VLR when the multimode terminal falls back to the 2G/3G network and the MSC/VLR supports MTRF; wherein, the cancel location request carries MTRF support and authorization flag and new MSC/VLR number.
Through the device, the international roaming gateway inquires whether the new MSC/VLR and the old MSC/VLR of the multi-mode terminal voice fallback network support the mobile terminal roaming forwarding MTRF according to the routing inquiry request, the multi-mode terminal falls back to the 2G/3G network, and the international roaming gateway initiates a request for canceling the position to the old MSC/VLR under the condition that the MSC/VLR supports the MTRF; wherein, the cancel location request carries MTRF support and authorization flag and new MSC/VLR number. By the method, the problems that the call completing rate of the voice fallback is low and connection errors are easy to occur in the inter-network international roaming process of the terminal are solved, the call completing rate of the voice fallback is improved, and the number of wrong connections is reduced.
The cancellation module 46 is further configured to initiate a location cancellation request to the old MSC/VLR in the case that the multimode terminal falls back to the 2G/3G network and the MSC/VLR does not support MTRF; wherein, the cancel location request carries MTRF support and unauthorized flag and new MSC/VLR number.
In the above embodiment, the system for voice fallback is further included, where the system includes the above international roaming gateway, and the international roaming gateway includes the above voice fallback apparatus.
The present invention will be described below with reference to preferred embodiments and embodiments.
The preferred embodiment provides a method for realizing voice fallback when a CDMA user is in international roaming in an LTE network, which is suitable for storing CDMA dual-mode (or multi-mode) user information in a CDMA home location register (HLRe), where GSM/UMTS information corresponding to the CDMA user is stored in an international roaming gateway FLR.
In the method for voice fallback when a CDMA user is internationally roamed in an LTE network, when the user is internationally roamed in the LTE network and the MSC/VLR where the user is located allows MTRR, when the user is called in the CDMA network, the FLR plays the role of the CDMA MSC/VLR and returns a routing response to HLRe, and a redirection label (redirectNum) is carried in a Temporary Local number (TLDN) of the routing response.
When the subscriber CSFB falls back to the 2G/3G network and reselects MSC/VLR registration in the GSM/UMTS network, the FLR plays the role of HLR in the GSM/UMTS network. When the new and old MSC/VLRs all allow MTRR, the FLR records the location update mark until the location update process is finished, when a SEND _ ROUTING _ update request sent by the MSC of GSM/UMTS is received in the process, whether the location update of the current user at the new MSC/VLR is finished is detected, if the location update process is not finished, after the location update process is finished, a Provision Roaming Number (PRN) request is sent to the new MSC/VLR, and if the ROUTING INFORMATION (SRI) is requested, the request carries a Roaming Retry mark (PRN), the Roaming Number is provided at the PRN. The request message carries a receive roaming retry supported (mt roaming retry supported) parameter.
When the subscriber CSFB falls back to the 2G/3G network and reselects MSC/VLR registration in the GSM/UMTS network, the FLR plays the role of HLR in the GSM/UMTS network. When the new and old MSC/VLRs both allow MTRF and the LOCATION UPDATE (UPDATE _ LOCATION) carries the MTRF flag, the FLR sends a delete LOCATION (CANCEL _ LOCATION) message to the user's previously registered MSC/VLR carrying the support and authorization flags
(MTRFmtrf-Supported AndAuuthorized), a new MSC/VLR Number (newMSC-Number, newVLR-Number).
Fig. 5 is a flowchart of a first embodiment of the MTRR after the voice fallback has successfully retrieved the roaming number according to the preferred embodiment of the present invention, and as shown in fig. 5, in the first embodiment of the present invention, when the user registers in the LTE network, for example, the user is a called service, and after the CSFB has retrieved the roaming number, to implement the MTRR, the preferred embodiment provides a method for interaction between the FLR and other network element entities, which includes the following steps:
step 501: a CDMA Gateway Mobile Switching Center (GMSC) receives a call initiation request of a user and initiates a position query request to an HLRe where a called user is located;
step 502: the HLRe initiates routing query to the FLR according to the recorded user position;
step 503: the invention requires the FLR to judge whether the current user is in the international roaming state and whether the MSC/VLR where the user is located allows MTRR, then the FLR returns the routing information to the HLRe, wherein the format is the routing code and the Mobile subscriber Directory Number (RN + MDN), and the RN is the routing code of the GMSC of GSM/UMTS.
Step 504: after receiving the routing code returned by the FLR, the HLRe returns the routing code to the CDMA GMSC;
step 505: and the CDMA GMSC redirects the call to the GMSC of the GSM/UMTS according to the routing information returned by the HLRe.
Step 506: the GMSC initiates a route query to the FLR according to the route configuration, and the request carries an MT routing RetrySupported mark;
step 507: the FLR plays the role of HLR, sends PRN to MSC/VLR where the user is located, and requests a roaming number;
step 508: after receiving the roaming number request, MSC/VLR returns the roaming number;
step 509: the FLR returns a roaming number to the GMSC through the SRI response;
step 510: the GMSC initiates initial address information (IMA for short) to MSC/VLR where the user is according to the roaming number;
step 511: the MSC/VLR pages the user to a Mobile management Entity (MME for short) through an SGs interface and triggers the user to fall back to the 2/3G network from the LTE;
step 512: after the user falls back to the 2/3G network, reselecting the MSC/VLR for location registration, wherein the selected MSC/VLR is different from the currently registered MSC/VLR;
step 513: the new MSC/VLR initiates a location updating request to the FLR;
step 514: after receiving the location update request of the new MSC/VLR, the FLR sends a cancel location (cancel location) to the previously registered MSC/VLR to request to delete the user information;
step 515: the old MSC/VLR returns a cancel location response to the FLR;
step 516: the FLR simulation MSC/VLR initiates a location updating request to the HLRe of the CDMA;
517: after completing the user location information updating, the HLRe returns a location updating response to the FLR;
step 518: the old MSC/VLR sends a Reply Call Handling (RCH) to the GMSC indicating that the user has sent a roaming retry (roaming), and the GMSC acknowledges the message back.
Step 519: the GMSC sends REL (Release) to the old MSC/VLR, and the Release releases the speech path resource between the old MSC/VLR and the GMSC.
Step 520: the FLR simulates an HLR and inserts user data to the new MSC/VLR;
step 521: the GMSC initiates a routing request to the FLR again;
step 522: the FLR continues to insert data to the MSC/VLR;
step 523: after the FLR completes the data downloading, the FLR sends a location updating response to the MSC/VLR to complete a location updating process;
step 524: the invention requires FLR to wait for the end of the location updating process, and after the FLR detects that the location updating process is finished, the invention requests a roaming number from a new MSC/VLR;
step 525: the new MSC/VLR returns a roaming number to the FLR;
step 526: the FLR returns a request Routing Information (SRI) MAP request Routing Information response to the GMSC, carrying the roaming number.
Step 527: the GMSC sends an IAM request to the MSC/VLR where the user is located according to the roaming number;
step 528: the new MSC/VLR sends a location update acceptance response to the user terminal to complete the attachment of the user on the MSC/VLR;
step 529: the user terminal completes a Temporary Identity (TMSI);
step 530: the new MSC/VLR initiates a call establishment request to initiate a call;
step 531: the mobile phone completes the call confirmation and completes the call establishment.
In step 507 of the first embodiment, the following description is provided:
optionally, in step 507, if the SRI request carries a Call reference number (Call reference number), the PRN needs to pass through.
Optionally, in step 507, if the SRI request carries a Roaming Retry (Roaming Retry) flag, the PRN request message carries a receive Roaming Retry support parameter (mtroaming Retry supported).
In step 524 of the first embodiment described in this embodiment, the following description is provided:
optionally, in step 524, the FLR detects whether there is an unfinished location update procedure currently, and if there is an unfinished location update procedure, waits for the location update procedure to be finished and then initiates a PRN request.
Step 516 and step 517 of the first embodiment are performed without any precedence relationship to step 518 and step 519.
Fig. 6 is a flowchart of a second embodiment of the MTRR after the voice fallback has successfully retrieved the roaming number according to the preferred embodiment of the present invention, as shown in fig. 6, in the second embodiment of the present invention, when the user registers in the LTE network, for example, the user is a called service, and the CSFB is triggered to implement the MTRR in the process of acquiring the roaming number, the present invention provides an interaction method between the FLR and other network element entities, which includes the following steps:
step 601: the CDMA GMSC receives a call starting request of a user and initiates a position query request to HLRe where a called user is located;
step 602: HLRe initiates routing query to FLR according to recorded user position
Step 603: the invention requires FLR to judge if the current user is in international roaming state and MSC/VLR where the user is located allows MTRR, then returns routing information to HLRe, the format is RN + MDN, wherein RN is the routing code of GSM/UMTS GMSC.
Step 604: after receiving the routing code returned by the FLR, the HLRe returns the routing code to the CDMAGMSC;
step 605: the CDMAGMSC redirects the call to GMSC of GSM/UMTS according to the routing information returned by HLRe.
Step 606: the GMSC initiates a route query to the FLR according to the route configuration, and the request carries an MT routing RetrySupported mark;
step 607: the FLR plays the role of HLR, sends PRN to MSC/VLR where the user is located, and requests a roaming number;
step 608: after receiving the roaming number request, the MSC/VLR initiates pre-paging to trigger the user to fall back to the 2/3G network from LTE;
step 609: after the user falls back to the 2/3G network, reselecting the MSC/VLR for location registration, wherein the selected MSC/VLR is different from the currently registered MSC/VLR;
step 610: the new MSC/VLR and the old MSC/VLR exchange whether an ongoing call exists or not through the Identification message;
step 611: the new MSC/VLR initiates a location updating request to the FLR;
step 612: after receiving the location updating request of the new MSC/VLR, the FLR sends cancel location to the previously registered MSC/VLR to request to delete the user information;
step 613: the old MSC/VLR returns a cancel location response to the FLR;
step 614: the FLR simulation MSC/VLR initiates a location updating request to the HLRe of the CDMA;
step 615: after completing the user location information updating, the HLRe returns a location updating response to the FLR;
step 616: the FLR simulates an HLR and inserts user data to the new MSC/VLR;
step 617: the old MSC/VLR returns PRN response to FLR, carrying the error indication and error reason of the absent user as: MTRR;
step 618: the FLR returns an SRI response to the GMSC, and carries an error indication of an absent user and an error reason MTRR;
step 619: the GMSC initiates a second SRI request to the FLR;
step 620: the FLR continues to insert data to the MSC/VLR;
step 621: after the FLR completes the data downloading, the FLR sends a location updating response to the MSC/VLR to complete a location updating process;
step 622: the invention requires FLR to wait for the end of the location updating process, and after the FLR detects that the location updating process is finished, the invention requests a roaming number from a new MSC/VLR;
step 623: the new MSC/VLR returns a roaming number to the FLR;
step 624: the FLR returns an SRI response to the GMSC, carrying the roaming number.
Step 625: the GMSC sends an IAM request to the MSC/VLR where the user is located according to the roaming number;
step 626: the new MSC/VLR sends a location update acceptance response to the user terminal to complete the attachment of the user on the MSC/VLR;
step 627: the user terminal completes TMSI allocation;
step 628: the new MSC/VLR initiates a call establishment request to initiate a call;
step 629: the mobile phone completes the call confirmation and completes the call establishment.
In step 607 of the first embodiment, the following description is given:
optionally, in step 607, if the SRI request carries the Call Reference Number, the PRN needs to pass through.
Optionally, in step 607, if the SRI request carries the Roaming Retry flag, the PRN request message carries the mtroaming Retry supported parameter.
The following description is made when step 622 of the second embodiment is implemented:
optionally, in step 622, the FLR detects whether there is an unfinished location update procedure currently, and if there is an unfinished location update procedure, waits for the location update procedure to be finished and then initiates a PRN request.
Step 614 and step 615 of the second embodiment are performed without any precedence relationship to step 616 and step 617.
Fig. 7 is a flowchart of a third embodiment of a voice fallback already MTRF of a voice fallback reselecting MSC according to the preferred embodiment of the present invention, and as shown in fig. 7, the embodiment of the MTRF process of the voice fallback reselecting MSC triggered when the user is in an LTE network as a called service according to the present invention includes the following steps:
step 701: the CDMA GMSC receives a call starting request of a user and initiates a position query request to HLRe where a called user is located;
step 702: HLRe initiates routing query to FLR according to recorded user position
Step 703: the FLR acts as an HLR and sends a PRN to the MSC/VLR where the subscriber is located, requesting a roaming number.
Step 704: after receiving the roaming number request, MSC/VLR returns the roaming number;
step 705: the FLR receives a routing number returned by the MSC/VLR, and returns a TLDN number to the HLRe through a routing request (routereq) response message;
step 706: HLRe returns a position query response to the CDMA GMSC;
step 707: the CDMA GMSC sends IAM information to MSC/VLR where the called party is located according to the result of the location query;
step 708: MSC/VLR pages user to MME through SGs interface, and trigger user to fall back to 2/3G network from LTE;
step 709: after the user falls back to the 2/3G network, reselecting the MSC/VLR for location registration, wherein the selected MSC/VLR is different from the current MSC/VLR;
step 710: the new MSC/VLR sends a Send Identification to the old MSC/VLR, and the Send Identification carries an Identification supporting MTRF and the number of the new MSC/VLR;
step 711: the new MSC/VLR initiates a location updating request to the FLR, and the request carries an indication supporting MTRF;
step 712: after receiving the location updating request of the new MSC/VLR, the FLR sends cancel location to the registered MSC/VLR, the invention especially requires the MTRF indication and the number of the new MSC/VLR to be carried in the request;
step 713: the old MSC/VLR responds to the cancel location returned by the FLR and stops paging the user;
step 714: the FLR simulation MSC/VLR initiates a location updating request to the HLRe of the CDMA;
step 715: after completing the user location information updating, the HLRe returns a location updating response to the FLR;
step 716: the FLR simulates an HLR and inserts user data to the new MSC/VLR;
step 717: the old MSC/VLR initiates a PRN request to the new MSC/VLR, and the request carries an MTRF indication and the number of the old MSC/VLR;
step 718: the FLR continues to add data to MSC/VLR.
Step 719: after the FLR completes the data downloading, the FLR sends a location updating response to the MSC/VLR to complete a location updating process;
step 720: the new MSC/VLR returns a PRN response to the old MSC/VLR, and the PRN response carries a routing number;
step 721: the old MSC/VLR sends an IAM request message to the new MSC/VLR;
step 722: the new MSC/VLR sends a location update acceptance response to the user terminal to complete the attachment of the user on the MSC/VLR;
step 723: the user terminal completes TMSI allocation;
step 724: the new MSC/VLR initiates a call establishment request to establish a call;
step 725: the mobile phone completes the call confirmation and completes the call establishment.
In step 712 of the above embodiment, the following description is made:
optionally, in step 712, if the FLR determines that the MTRF issue policy is satisfied, the cancel location sent to the MSC/VLR carries the MTRF Supported And Authorized flag And the new MSC/VLRnumbers.
Optionally, in step 712, if the FLR determines that the MTRF distribution policy is not met, the cancel location sent to the MSC/VLR carries the MTRF Supported And not Authorized flag And the new MSC/VLR number.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A method of voice fallback, comprising:
receiving a route query request of a home location register (HLRe) by an international roaming gateway, wherein the route query request is caused by a position query request initiated to the HLRe by a called multimode terminal in an international roaming state;
the international roaming gateway inquires whether a new and old mobile switching center/visitor location register (MSC/VLR) of the multi-mode terminal voice fallback network supports mobile terminal roaming retry MTRR or not according to the routing inquiry request, wherein the new and old MSC/VLR comprises a new MSC/VLR and an old MSC/VLR;
under the condition that the multimode terminal falls back to the 2G/3G network and the new and old MSC/VLR both support the MTRR, the international roaming gateway inquires whether the location updating process is finished;
and under the condition that the international roaming gateway receives the end of the detection position updating process, initiating a roaming number request (PRN) to the newly registered MSC/VLR.
2. The method of claim 1, wherein after the international roaming gateway queries whether the location update procedure is finished, and before the international roaming gateway initiates a roaming number request PRN to a newly registered MSC/VLR when detecting that the location update procedure is finished, the method further comprises:
and waiting for the position updating process to be ended when the international roaming gateway receives and detects that the position updating process is not ended.
3. The method of claim 1, wherein querying whether the location update procedure is over by the international roaming gateway comprises:
and the international roaming gateway receives a routing information sending request sent by the network MSC and detects whether the location update of the new MSC/VLR of the multimode terminal is finished.
4. The method of claim 1, further comprising:
under the condition that the PRN carries a receiving roaming retry support parameter, the international roaming gateway responds to a request routing information SRI carrying a roaming retry mark of a gateway mobile switching center GMSC;
and under the condition of the PRN transparent transmission, the international roaming gateway responds to the request routing information SRI of the gateway mobile switching center GMSC with a carried call reference number.
5. A method of voice fallback, comprising:
receiving a routing query request of an HLRe by an international roaming gateway, wherein the routing query request is caused by a position query request initiated to the HLRe by a called multimode terminal in an international roaming state;
the international roaming gateway inquires whether the new and old MSC/VLR of the multi-mode terminal voice fallback network supports mobile terminal roaming forwarding MTRF according to the routing inquiry request, wherein the new and old MSC/VLR comprises a new MSC/VLR and an old MSC/VLR;
the multi-mode terminal falls back to the 2G/3G network and the international roaming gateway initiates a location canceling request to the old MSC/VLR under the condition that the new MSC/VLR and the old MSC/VLR both support MTRF; wherein, the cancel location request carries MTRF support and authorization flag and new MSC/VLR number.
6. The method according to claim 5, wherein the international roaming gateway queries whether the new and old MSC/VLR of the multimode terminal voice fallback network supports mobile terminal roaming forwarding MTRF according to the route query request, further comprising:
under the condition that the multimode terminal falls back to a 2G/3G network and the new and old MSC/VLR does not support MTRF, the international roaming gateway initiates a request for canceling the position to the old MSC/VLR; wherein, the cancel location request carries MTRF support and unauthorized mark and new MSC/VLR number.
7. An apparatus for voice fallback at an international roaming gateway, comprising:
a receiving module, configured to receive a route query request of a home location register HLRe, where the route query request is caused by a location query request initiated by a called multimode terminal in an international roaming state to the HLRe;
a first supporting module, configured to query, according to the route query request, whether a new and old mobile switching center/visitor location register MSC/VLR of the voice fallback network of the multimode terminal supports a mobile terminal roaming retry MTRR, where the new and old MSC/VLR includes a new MSC/VLR and an old MSC/VLR;
the inquiry module is used for inquiring whether the location updating process is finished or not under the condition that the multi-mode terminal falls back to the 2G/3G network and the new and old MSC/VLR support the MTRR;
and the request module is used for initiating a roaming number request PRN to the newly registered MSC/VLR under the condition that the international roaming gateway receives the end of the detection position updating process.
8. The apparatus of claim 7, further comprising:
and the waiting module is used for waiting for the end of the location updating process under the condition that the international roaming gateway receives and detects that the location updating process is not ended.
9. The apparatus according to claim 7, wherein the first support module is further configured to detect whether the location update of the new MSC/VLR of the multimode terminal is finished after receiving a routing information sending request sent by the local network MSC.
10. An apparatus for voice fallback at an international roaming gateway, comprising:
a receiving module, configured to receive a routing query request of an HLRe, where the routing query request is caused by a location query request initiated by a called multimode terminal in an international roaming state to the HLRe;
a second support module, configured to query, according to the route query request, whether the new and old MSC/VLR of the voice fallback network of the multimode terminal supports mobile terminal roaming forwarding MTRF, where the new and old MSC/VLR includes a new MSC/VLR and an old MSC/VLR;
a cancellation module, configured to initiate a location cancellation request to the old MSC/VLR when the multimode terminal falls back to a 2G/3G network and the new and old MSC/VLR supports MTRF; wherein, the cancel location request carries MTRF support and authorization flag and new MSC/VLR number.
11. The apparatus of claim 10, comprising:
the cancellation module is further configured to initiate a location cancellation request to the old MSC/VLR when the multimode terminal falls back to the 2G/3G network and the new and old MSC/VLR does not support MTRF; wherein, the cancel location request carries MTRF support and unauthorized mark and new MSC/VLR number.
12. A system for voice fallback, comprising:
an international roaming gateway comprising a voice fallback apparatus according to any one of claims 7 to 9, and according to claim 10 or 11.
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