CN107645723A - VoLTE access domain selection method and systems - Google Patents

VoLTE access domain selection method and systems Download PDF

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Publication number
CN107645723A
CN107645723A CN201610584229.3A CN201610584229A CN107645723A CN 107645723 A CN107645723 A CN 107645723A CN 201610584229 A CN201610584229 A CN 201610584229A CN 107645723 A CN107645723 A CN 107645723A
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volte
request
registration
scc
hlr
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CN107645723B (en
Inventor
马金兰
赵学军
杨征
朱晓洁
彭莉
王庆扬
张琳峰
尹珂
杨维忠
林俐
陈庆年
陶启茜
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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Abstract

The present invention discloses a kind of VoLTE access domain selections method and system, is related to the communications field.Wherein VoLTE user is after VoLTE IMS networks complete registration, third-party registration is initiated by S CSCF modules to SCC AS to ask, after SCC AS carry out corresponding third-party registration, HLR into cdma network sends registration notice, to show that VoLTE user registers in VoLTE IMS networks, HLR carries out corresponding registration process according to registration notice, and return to registration notice success response to SCC AS, the input field of VoLTE user is recorded as VoLTE networks by SCC AS after registration notice success response is received.The present invention interacts by using SCC AS with the login states carried out of the HLR in 2G/3G, to realize that accurate region selects, while without transforming existing network, dramatically saves on network design cost.

Description

VoLTE access domain selection method and systems
Technical field
The present invention relates to the communications field, more particularly to a kind of VoLTE (Voice over LTE, the voice based on LTE) connects Enter area selecting method and system.
Background technology
In order to break away from CDMA (Code Division Multiple Access, CDMA) network, cdma network as early as possible Operator promotes mainly the VoLTE terminals without C moulds.But in following two scenes, when VoLTE user does called, VoLTE nets Network still needs the called input field of accurate selection, otherwise called connection may be caused to fail：
1st, usim card is turned back to non-VoLTE terminals by VoLTE user, it is desirable to can provide industry automatically by cdma network for it Business；
2nd, when VoLTE user is diffused out using G moulds by the GC gateways world, it is desirable to which VoLTE can be routed to by cdma network User.
Existing VoLTE technologies be based on 2G/3G HLR (Home Location Register, attaching position register) with VoLTE HSS (Home Subscriber Server, home signature user server) fusions know called subscriber in 2G/3G nets The login state of network, so as to realize the accurate selection of called input field.But it is big that CDMA HLR with VoLTE HSS merge difficulty.
The content of the invention
The embodiment of the present invention provides a kind of VoLTE access domain selections method and system, by using in SCC AS and 2G/3G The login state interactions that are carried out of HLR, to realize that accurate region selects, while without transform existing network, greatly save Network design cost is saved.
According to an aspect of the present invention, there is provided a kind of VoLTE access domain selections method, including：
VoLTE user passes through service call conversation control function S-CSCF modules after VoLTE IMS networks complete registration Third-party registration request is initiated to service set and continuous application server S CC AS；
SCC AS carry out corresponding third-party registration, and the homing position into cdma network according to third-party registration request Register HLR sends registration notice, to show that VoLTE user registers in VoLTE IMS networks；
HLR carries out corresponding registration process according to registration notice, and returns to registration notice success response to SCC AS；
The input field of VoLTE user is recorded as VoLTE networks by SCC AS after registration notice success response is received.
In one embodiment, CDMA network elements are sent out after the position updating request of VoLTE user's transmission is received to HLR Registration is sent to ask；
HLR is registered accordingly according to registration request, and sends canceling position registration request to SCC AS；
The input field of VoLTE user is recorded as cdma network by SCC AS according to canceling position registration request.
In one embodiment, CDMA network elements are MSC or GC gateways.
In one embodiment, SCC AS inquire about VoLTE after the call request for the VoLTE user that continues is received The input field of user；
If the input field of VoLTE user is VoLTE networks, call request is sent to S-CSCF modules by SCC AS, its In the called request address Request URI in call request are not modified, so as to the VoLTE user that continues.
In one embodiment, if the input field of VoLTE user is cdma network, SCC AS obtain from cdma network side The routing iinformation of VoLTE user；
Call request is sent to S-CSCF modules by SCC AS, wherein by the called request address in call request Request URI are revised as routing iinformation, so that call request is routed to CDMA network elements by S-CSCF modules according to routing iinformation To access VoLTE user.
In one embodiment, the step of SCC AS obtain the routing iinformation of VoLTE user from cdma network side includes：
SCC AS send position requests to HLR；
HLR is according to position requests, from the routing iinformation of CDMA network elements acquisition VoLTE user；
HLR sends position request response to SCC AS, and wherein position request response includes the route letter of VoLTE user Breath.
According to another aspect of the present invention, there is provided a kind of VoLTE access domain selections system, including service call session control Attaching position register HLR in function S-CSCF modules, service set and continuous application server S CC AS, cdma network, Wherein SCC AS include domain selecting module and state synchronized module, wherein：
S-CSCF modules, the third-party registration request for VoLTE user to be sent are sent to domain selecting module, wherein VoLTE user initiates third-party registration request after VoLTE IMS networks complete registration to SCC AS；
Domain selecting module, for carrying out corresponding third-party registration after third-party registration request is received, and in state After synchronization module receives the registration notice success response of HLR returns, the input field of VoLTE user is recorded as VoLTE networks；
State synchronized module, for domain selecting module complete third-party registration after, the homing position into cdma network Register HLR sends registration notice, to show that VoLTE user registers in VoLTE IMS networks；
HLR, for carrying out corresponding registration process according to registration notice, and to state synchronized module return registration notice into Work(responds.
In one embodiment, said system also includes CDMA network elements, wherein：
CDMA network elements, for after the position updating request of VoLTE user's transmission is received, sending and registering to HLR Request；
HLR is additionally operable to be registered accordingly according to registration request, and sends and cancel to state synchronized module Position register request；
State synchronized module is additionally operable to according to canceling position registration request, and instructions field selecting module is by VoLTE user's Input field is recorded as cdma network.
In one embodiment, CDMA network elements are MSC or GC gateways.
In one embodiment, domain selecting module is additionally operable to after the call request for the VoLTE user that continues is received, The input field of VoLTE user is inquired about, if the input field of VoLTE user is VoLTE networks, call request is sent to S-CSCF Module, wherein not modified to the called request address Request URI in call request, so as to the VoLTE user that continues.
In one embodiment, state synchronized module is additionally operable in the situation that the input field of VoLTE user is cdma network Under, from the routing iinformation of cdma network side acquisition VoLTE user；
Call request is sent to S-CSCF modules by domain selecting module, wherein by the called request address in call request Request URI are revised as routing iinformation, so that call request is routed to CDMA network elements by S-CSCF modules according to routing iinformation To access VoLTE user.
In one embodiment, state synchronized module specifically sends position requests to HLR, and please from the position that HLR is sent Seek the routing iinformation that VoLTE user is obtained in response；
HLR is additionally operable to according to position requests, and the routing iinformation of VoLTE user is obtained from CDMA network elements, and to state synchronized Module sends position request response, and wherein position request response includes the routing iinformation of VoLTE user.
By referring to the drawings to the present invention exemplary embodiment detailed description, further feature of the invention and its Advantage will be made apparent from.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the schematic diagram of VoLTE access domain selections method one embodiment of the present invention.
Fig. 2 is the schematic diagram of another embodiment of VoLTE access domain selections method of the present invention.
Fig. 3 is the schematic diagram of the another embodiment of VoLTE access domain selections method of the present invention.
Fig. 4 is the schematic diagram of VoLTE access domain selections system one embodiment of the present invention.
Fig. 5 is the schematic diagram of the another embodiment of VoLTE access domain selections system of the present invention.
Fig. 6 is schematic diagram of the VoLTE user of the present invention in access domain selection one embodiment of VoLTE networks.
Fig. 7 is schematic diagram of the VoLTE user of the present invention in access domain selection one embodiment of cdma network.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Below Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes Any restrictions.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, belongs to the scope of protection of the invention.
Unless specifically stated otherwise, the part and positioned opposite, the digital table of step otherwise illustrated in these embodiments Do not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for the ease of description, the size of the various pieces shown in accompanying drawing is not according to reality Proportionate relationship draw.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable In the case of, the technology, method and apparatus should be considered as authorizing part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
Fig. 1 is the schematic diagram of VoLTE access domain selections method one embodiment of the present invention.Wherein：
Step 101, VoLTE user is at VoLTE IMS (IP Multimedia Subsystem, IP multimedia subsystem) After network completes registration, pass through S-CSCF (Serving Call Session Control Function, service call session Control function) module is to SCC AS (Service Centralization and Continuity Application Server, service set and continuous application server) initiate third-party registration request.
Step 102, SCC AS carry out corresponding third-party registration according to third-party registration request, and into cdma network Attaching position register HLR sends registration notice, to show that VoLTE user registers in VoLTE IMS networks.
Step 103, HLR carries out corresponding registration process according to registration notice, and returns to registration to SCC AS and notify successfully Response.
Step 104, the input field of VoLTE user is recorded as by SCC AS after registration notice success response is received VoLTE networks.
The VoLTE access domain selection methods provided based on the above embodiment of the present invention, by using in SCC AS and 2G/3G The login state interactions that are carried out of HLR, to realize that accurate region selects, while without transform existing network, greatly save Network design cost is saved.
Fig. 2 is the schematic diagram of another embodiment of VoLTE access domain selections method of the present invention.Wherein：
Step 201, CDMA network elements send registration to HLR and stepped on after the position updating request of VoLTE user's transmission is received Note request.
Wherein, usim card is being turned back to non-VoLTE 4G terminals by VoLTE user, or VoLTE user passes through GC using G moulds Under the scene of gateway international roaming, position updating request Location_updating_request is sent to MSC or GC gateways.
Alternatively, CDMA network elements can be MSC (Mobile Switching Center, mobile switching centre) or GC gateways, Wherein GC gateways are used for the message conversion for completing C nets and G nets.
Step 202, HLR is registered accordingly according to registration request, and sends canceling position to SCC AS Registration request.
Step 203, the input field of VoLTE user is recorded as cdma network by SCC AS according to canceling position registration request.
Fig. 3 is the schematic diagram of the another embodiment of VoLTE access domain selections method of the present invention.In this embodiment, SCC AS After the call request for the VoLTE user that continues is received, handled accordingly according to the input field of VoLTE user.
Step 301, after the call request for the VoLTE user that continues is received, inquiry VoLTE user's connects SCC AS Enter domain；
Step 302, whether the input field for judging VoLTE user is VoLTE networks.If the input field of VoLTE user is VoLTE networks, then perform step 303；If the input field of VoLTE user is cdma network, step 304 is performed.
Step 303, call request is sent to S-CSCF modules by SCC AS, wherein not to the called request in call request Address Request URI modify, so as to the VoLTE user that continues.Other steps of the present embodiment are no longer performed afterwards.
Step 304, SCC AS obtain the routing iinformation of VoLTE user from cdma network side.
Step 305, call request is sent to S-CSCF modules by SCC AS, wherein by the called request in call request Location Request URI are revised as above-mentioned routing iinformation, so that call request is routed to by S-CSCF modules according to the routing iinformation CDMA network elements are to access VoLTE user.
Alternatively, the step of SCC AS obtain the routing iinformation of VoLTE user from cdma network side includes：SCC AS to HLR sends position requests, and HLR is according to position requests, from the routing iinformation TLDN of CDMA network elements acquisition VoLTE user (Temporary Local Directory Number, interim local number).HLR sends position request response to SCC AS, Wherein position request response includes the routing iinformation of VoLTE user.
Fig. 4 is the schematic diagram of VoLTE access domain selections system one embodiment of the present invention.As shown in figure 4, the system can wrap The attaching position register HLR 403 in S-CSCF modules 401, SCC AS 402, cdma network is included, wherein SCC AS 402 are wrapped Include domain selecting module 4021 and state synchronized module 4022.Wherein：
S-CSCF modules 401 are used to the third-party registration request that VoLTE user sends being sent to domain selecting module, wherein VoLTE user initiates third-party registration request after VoLTE IMS networks complete registration to SCC AS.
Domain selecting module 4021 is used to carry out corresponding third-party registration after third-party registration request is received, and in shape After state synchronization module 4022 receives the registration notice success response of HLR returns, the input field of VoLTE user is recorded as VoLTE networks.
State synchronized module 4022 is used for after domain selecting module 4021 completes third-party registration, returning into cdma network Belong to location register HLR and send registration notice, to show that VoLTE user registers in VoLTE IMS networks.
HLR 403 is used to carry out corresponding registration process according to registration notice, and logical to the return registration of state synchronized module Know success response.
The VoLTE access domain selection systems provided based on the above embodiment of the present invention, by using in SCC AS and 2G/3G The login state interactions that are carried out of HLR, to realize that accurate region selects, while without transform existing network, greatly save Network design cost is saved.
Fig. 5 is the schematic diagram of the another embodiment of VoLTE access domain selections system of the present invention.Compared with embodiment illustrated in fig. 4, In the embodiment shown in fig. 5, except S-CSCF modules 501, SCC AS 502 (including domain selecting module 5021 and state synchronized module 5022), outside the attaching position register HLR 503 in cdma network, the system still further comprises CDMA network elements 504.Its In：
CDMA network elements 504, for after the position updating request of VoLTE user's transmission is received, sending and noting to HLR 503 Volume registration request.
Alternatively, CDMA network elements 504 can be MSC or GC gateways.
HLR 503 is additionally operable to be registered accordingly according to registration request, and to state synchronized module 5022 Send canceling position registration request.
State synchronized module 5022 is additionally operable to according to canceling position registration request, and instructions field selecting module 5021 will The input field of VoLTE user is recorded as cdma network.
Alternatively, domain selecting module 5021 is additionally operable to after the call request for the VoLTE user that continues is received, inquiry The input field of VoLTE user, if the input field of VoLTE user is VoLTE networks, call request is sent to S-CSCF modules 501, wherein not modified to the called request address Request URI in call request, so as to the VoLTE user that continues.
Alternatively, state synchronized module 5022 is additionally operable in the case where the input field of VoLTE user is cdma network, from Cdma network side obtains the routing iinformation of VoLTE user.Call request is sent to S-CSCF modules by domain selecting module 5021 501, wherein the called request address Request URI in call request are revised as into above-mentioned routing iinformation, so as to S-CSCF moulds Call request is passed through MGCF (Media Gateway Control Function, WMG by block 501 according to the routing iinformation Control function) module is routed to corresponding CDMA network elements to access VoLTE user.
Alternatively, state synchronized module 5022 specifically can send position requests to HLR 503, and HLR 503 is used for according to position Request is put, the routing iinformation of VoLTE user is obtained from CDMA network elements 504, and position requests are sent to state synchronized module 5022 Response, wherein position request response includes the routing iinformation of VoLTE user.State synchronized module 5022 is sent from HLR 503 Position request response in obtain VoLTE user routing iinformation.
Below by specific example, the present invention will be described.Fig. 6 is VoLTE user of the present invention connecing in VoLTE networks Enter the schematic diagram that domain selects one embodiment.
Step 601, VoLTE user is initiated after VoLTE IMS networks complete registration by S-CSCF modules to SCC AS Third-party registration is asked.
Step 602, SCC AS carry out corresponding third-party registration according to third-party registration request.
Step 603, SCC AS return to third-party registration success response.
Step 604, HLR of the state synchronized module in SCC AS into cdma network sends registration notice REGNOT, with Show that VoLTE user registers in VoLTE IMS networks.
Step 605, HLR carries out corresponding registration process according to registration notice, and logical to the return registration of state synchronized module Know success response.
Step 606, the input field of VoLTE user is recorded as by SCC AS after registration notice success response is received VoLTE networks.
Step 607, the called request for the VoLTE user that continues is sent to SCC AS by S-CSCF modules.
Step 608, SCC AS are VoLTE networks according to the input field of the VoLTE user, are directly sent to request message S-CSCF modules, wherein not modified to the called request address Request URI in call request, to continue this VoLTE user.
Fig. 7 is schematic diagram of the VoLTE user of the present invention in access domain selection one embodiment of cdma network.
Step 701, usim card is being turned back to non-VoLTE 4G terminals by VoLTE user, or VoLTE user is led to using G moulds Cross under the scene of GC gateway international roamings, position updating request Location_updating_request is sent to CDMA network elements.
Wherein, CDMA network elements can be MSC or GC gateways.As an example, that provided in figure is MSC.
Step 702, CDMA network elements are after the position updating request of VoLTE user's transmission is received, into cdma network HLR sends registration request.
Step 703, HLR is registered accordingly according to registration request.
Step 704, HLR sends canceling position registration request REGCANC to SCC AS state synchronized module.
Step 705, the input field of VoLTE user is recorded as cdma network according to canceling position registration request by SCC AS, And canceling position registration request is returned to HLR by state synchronized module and responded.
Step 706, HLR returns to registration success response to CDMA network elements.
Step 707, the called request for the VoLTE user that continues is sent to SCC AS by S-CSCF modules.
Step 708, SCC AS are cdma network according to the input field of VoLTE user, then state synchronized module is sent to HLR Position requests LOCREQ.
Step 709, HLR sends route requests ROUTREQ to CDMA network elements.
Step 710, CDMA network elements return to routing iinformation to HLR, including TLDN.
Step 711, state synchronized modules of the HLR into SCC AS sends position request response, wherein position request response Include TLDN.
Step 712, call request is sent to S-CSCF modules by SCC AS, wherein by the Request in call request URI is revised as TLDN, so that call request is routed to CDMA network elements to access by S-CSCF modules according to TLDN by MGCF VoLTE user.
The present invention in SCC AS by increasing state synchronized module newly, by using the newly-increased state synchronized mould in SCC AS Block interacts with the HLR progress login states in 2G/3G, to realize that accurate region selects, while without transform existing network, It dramatically saves on network design cost.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment To complete, by program the hardware of correlation can also be instructed to complete, described program can be stored in a kind of computer-readable In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
Description of the invention provides for the sake of example and description, and is not exhaustively or by the present invention It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Select and retouch State embodiment and be to more preferably illustrate the principle and practical application of the present invention, and one of ordinary skill in the art is managed The present invention is solved so as to design the various embodiments with various modifications suitable for special-purpose.

Claims (12)

  1. A kind of 1. VoLTE access domain selections method, it is characterised in that including：
    VoLTE user is after VoLTE IMS networks complete registration, by service call conversation control function S-CSCF modules to industry Business collection neutralizes continuous application server S CC AS and initiates third-party registration request；
    SCC AS carry out corresponding third-party registration, and the home location register into cdma network according to third-party registration request Device HLR sends registration notice, to show that the VoLTE user registers in VoLTE IMS networks；
    The HLR carries out corresponding registration process according to registration notice, and returns to registration notice success response to SCC AS；
    The input field of the VoLTE user is recorded as VoLTE networks by SCC AS after registration notice success response is received.
  2. 2. according to the method for claim 1, it is characterised in that
    For CDMA network elements after the position updating request that the VoLTE user sends is received, sending registration to the HLR please Ask；
    The HLR is registered accordingly according to registration request, and sends canceling position registration request to SCC AS；
    The input field of the VoLTE user is recorded as cdma network by SCC AS according to canceling position registration request.
  3. 3. according to the method for claim 2, it is characterised in that
    The CDMA network elements are MSC or GC gateways.
  4. 4. according to the method any one of claim 1-3, it is characterised in that
    SCC AS inquire about the access of the VoLTE user after the call request for the VoLTE user that continues is received Domain；
    If the input field of the VoLTE user is VoLTE networks, call request is sent to S-CSCF modules by SCC AS, its In the called request address RequestURI in call request is not modified, so as to the VoLTE user that continues.
  5. 5. according to the method for claim 4, it is characterised in that
    If the input field of the VoLTE user is cdma network, SCC AS obtain the VoLTE user's from cdma network side Routing iinformation；
    Call request is sent to S-CSCF modules by SCC AS, wherein by the called request address Request in call request URI is revised as the routing iinformation, so that call request is routed to CDMA network elements by S-CSCF modules according to the routing iinformation To access the VoLTE user.
  6. 6. according to the method for claim 5, it is characterised in that
    SCC AS include from the step of routing iinformation of the cdma network side acquisition VoLTE user：
    SCC AS send position requests to the HLR；
    The HLR is according to position requests, from the routing iinformation of the CDMA network elements acquisition VoLTE user；
    The HLR sends position request response to SCC AS, and wherein position request response includes the route of the VoLTE user Information.
  7. A kind of 7. VoLTE access domain selections system, it is characterised in that including service call conversation control function S-CSCF modules, Attaching position register HLR in service set and continuous application server S CC AS, cdma network, wherein SCC AS include domain Selecting module and state synchronized module, wherein：
    S-CSCF modules, the third-party registration request for VoLTE user to be sent is sent to domain selecting module, wherein described VoLTE user initiates third-party registration request after VoLTE IMS networks complete registration to SCC AS；
    Domain selecting module, for carrying out corresponding third-party registration after third-party registration request is received, and in state synchronized After module receives the registration notice success response of HLR returns, the input field of the VoLTE user is recorded as VoLTE networks；
    State synchronized module, for domain selecting module complete third-party registration after, the home location register into cdma network Device HLR sends registration notice, to show that the VoLTE user registers in VoLTE IMS networks；
    HLR, for carrying out corresponding registration process according to registration notice, and to the state synchronized module return registration notice into Work(responds.
  8. 8. system according to claim 7, it is characterised in that also including CDMA network elements, wherein：
    CDMA network elements, for after the position updating request that the VoLTE user sends is received, sending and registering to HLR Request；
    HLR is additionally operable to be registered accordingly according to registration request, and sends canceling position to state synchronized module Registration request；
    State synchronized module is additionally operable to according to canceling position registration request, and instructions field selecting module is by the VoLTE user's Input field is recorded as cdma network.
  9. 9. system according to claim 8, it is characterised in that
    The CDMA network elements are MSC or GC gateways.
  10. 10. according to the system any one of claim 7-9, it is characterised in that
    Domain selecting module is additionally operable to after the call request for the VoLTE user that continues is received, and is inquired about the VoLTE and is used The input field at family, if the input field of the VoLTE user is VoLTE networks, call request is sent to S-CSCF modules, its In the called request address Request URI in call request are not modified, so as to the VoLTE user that continues.
  11. 11. system according to claim 10, it is characterised in that
    State synchronized module is additionally operable in the case where the input field of the VoLTE user is cdma network, from cdma network side Obtain the routing iinformation of the VoLTE user；
    Call request is sent to S-CSCF modules by domain selecting module, wherein by the called request address in call request Request URI are revised as the routing iinformation, so that call request is routed to by S-CSCF modules according to the routing iinformation CDMA network elements are to access the VoLTE user.
  12. 12. system according to claim 11, it is characterised in that
    State synchronized module specifically sends position requests to HLR, and is obtained in the position request response sent from HLR described The routing iinformation of VoLTE user；
    HLR is additionally operable to according to position requests, obtains the routing iinformation of the VoLTE user from CDMA network elements, and to state synchronized Module sends position request response, and wherein position request response includes the routing iinformation of the VoLTE user.
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CN109964497A (en) * 2018-02-09 2019-07-02 Oppo广东移动通信有限公司 The method and the network equipment of wireless communication
CN111200809A (en) * 2018-11-20 2020-05-26 中国电信股份有限公司 Method, gateway and system for realizing VOLTE terminal international roaming service
WO2024055818A1 (en) * 2022-09-13 2024-03-21 中兴通讯股份有限公司 Communication method, converged user data management network element, first network element and storage medium

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