CN106937264A - Method, system and HSS that VoLTE user's calling is addressed - Google Patents

Method, system and HSS that VoLTE user's calling is addressed Download PDF

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Publication number
CN106937264A
CN106937264A CN201511004620.3A CN201511004620A CN106937264A CN 106937264 A CN106937264 A CN 106937264A CN 201511004620 A CN201511004620 A CN 201511004620A CN 106937264 A CN106937264 A CN 106937264A
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network
hss
cscf
user
hlr
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CN106937264B (en
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史敏锐
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Method, system and HSS the invention discloses a kind of VoLTE user calling addressing, are related to moving communicating field.The method of the present invention includes：The address lookup for being continued to called VoLTE user that HSS receives I-CSCF transmissions is asked；Whether the VoLTE user's registration informations that HSS sends according to HLR judge called VoLTE user in 2G network registries, and return and continue network element address information, I-CSCF called VoLTE user in the case of 2G network registries according to the network element address information that continues by call proceeding to 2G networks.The present invention notifies HSS when VoLTE user is in 2G network registries by increasing communication interface between HSS and HLR by HLR, HSS is indicated the follow-up network element that continues by call proceeding to 2G networks.So as to solve the problems, such as in the case that HSS and HLR are separated and called VoLTE user in 2G network insertions when called connection, improve the efficiency of call proceeding.Additionally, the process of call proceeding is no longer completed by access domain election server, so as to reduce the expense of signaling.

Description

VoLTE user call addressing method, system and HSS
Technical Field
The invention relates to the field of mobile communication, in particular to a VoLTE user call addressing method, a VoLTE user call addressing system and an HSS.
Background
In the existing solution of a Voice over LTE (Voice over LTE) call, an HSS (Home Subscriber Server) and an HLR (Home Location Register) are combined, and the HSS/HLR combination can solve the call connection problem of a called user when the called user registers in a 2G (second generation Mobile Communication System) network, such as a GSM (Global System for Mobile Communication) or a CDMA (Code Division Multiple Access) network. In addition, AS shown in fig. 1, when the HSS/HLR is installed, the user registers to the domain selection server (AS) when logging in. When a VoLTE user is called, an IMS (IP Multimedia Subsystem) needs to determine the current network of the user, perform domain selection and connection to the called user, and an S-CSCF (Serving Call session control Function) entity accesses a domain selection server, which determines the access network of the user and instructs the S-CSCF to perform connection. By this method, each access to the domain selection server is required, increasing signaling overhead.
Disclosure of Invention
The embodiment of the invention aims to solve the technical problem that: the problem of called connection of a called VoLTE user in the 2G network access under the condition that the HSS and the HLR are separated is solved, and the call connection efficiency is improved.
Another technical problem to be solved by the embodiments of the present invention is: under the condition that the HSS and the HLR are separated and the called VoLTE user is accessed in the 2G network, the process of call connection is completed without accessing the domain selection server, and the signaling overhead is reduced.
According to an aspect of the embodiments of the present invention, a VoLTE user call addressing method is provided, which includes: a Home Subscriber Server (HSS) receives an address query request which is sent by a query call session control function entity (I-CSCF) and used for continuing a called VoLTE user; and the HSS judges whether the called VoLTE user is registered in the 2G network of the second generation mobile communication system or not according to the VoLTE user registration information sent by the user location register HLR, and returns the address information of the connection network element so that the I-CSCF connects the call to the 2G network according to the address information of the connection network element under the condition that the called VoLTE user is registered in the 2G network.
In one embodiment, the VoLTE user call addressing method further comprises: the HLR receives a registration notification message sent when the VoLTE user accesses the 2G network; and the HLR sends a notification message that the VoLTE user is registered in the 2G network to the HSS after the user is successfully registered through an additionally arranged interface between the HLR and the HSS.
In one embodiment, the HSS returns address information of a media gateway control function entity MGCF in case that the called VoLTE subscriber is registered in the 2G network, so that the I-CSCF connects the call to the 2G network through the MGCF; or, the HSS returns the address information of the service call session control function entity S-CSCF under the condition that the called VoLTE user is registered in the 2G network, so that the I-CSCF connects the call to the 2G network through the S-CSCF and the MGCF.
In one embodiment, the VoLTE subscriber registration information sent by the HLR to the HSS includes an access code for identifying that a VoLTE subscriber is registered in the 2G network; the information returned by HSS to I-CSCF also includes access code.
In one embodiment, the I-CSCF sends an INVITE message to the MGCF, wherein the INVITE message carries an access code; MGCF receives the INVITE message and then sends an initial address message IAM to gateway mobile switching center GMSC, wherein the IAM carries an access code; after receiving the IAM message, the GMCS acquires a temporary local number TLDN or a roaming number RN of the user from the HLR, and continues the call to the called VoLTE user through the TLDN or the RN; or the I-CSCF sends an INVITE message to the S-CSCF, wherein the INVITE message carries the access code; S-CSCF sends INVITE message to MGCF, which carries access code; MGCF receives the INVITE message and then sends an IAM message to the GMSC, wherein the IAM message carries an access code; after receiving the IAM message, the GMCS acquires the TLDN or RN of the user from the HLR, and connects the call to the called VoLTE user through the TLDN or RN.
According to a second aspect of the embodiments of the present invention, there is provided a home subscriber server HSS, including: the device comprises an address query request receiving unit, a service processing unit and a service processing unit, wherein the address query request receiving unit is used for receiving an address query request which is sent by an I-CSCF and used for continuing a called VoLTE user; and the connection network element address sending unit is used for judging whether the called VoLTE user is registered in the 2G network or not according to the VoLTE user registration information sent by the HLR and returning connection network element address information so that the I-CSCF can connect the call to the 2G network according to the connection network element address information under the condition that the called VoLTE user is registered in the 2G network.
In one embodiment, the HSS further comprises: and the user registration information receiving unit is used for receiving a notification message that the VoLTE user is registered in the 2G network and sent by the HLR through an interface between the added HLR and the HSS.
In one embodiment, the connection network element address sending unit is configured to return address information of the MGCF when the called VoLTE subscriber is registered in the 2G network, so that the I-CSCF connects the call to the 2G network through the MGCF; or, the connection network element address sending unit is used for returning the address information of the S-CSCF under the condition that the called VoLTE user is registered in the 2G network, so that the I-CSCF connects the call to the 2G network through the S-CSCF and the MGCF.
In one embodiment, the user registration information receiving unit receives the VoLTE user registration information sent by the HLR, and the VoLTE user registration information includes an access code for identifying that the VoLTE user is registered in the 2G network; the information returned by the connection network element address sending unit to the I-CSCF also comprises an access code.
According to a third aspect of the embodiments of the present invention, there is provided a VoLTE user call addressing system, including: a home subscriber server HSS, a subscriber location register HLR, an inquiry call session control function entity I-CSCF, a media gateway control function entity MGCF, and a gateway mobile switching center GMSC in any of the foregoing embodiments; the system comprises an HLR, an HSS and a voice over long term evolution (VoLTE) server, wherein the HLR is used for receiving a registration notification message sent when a VoLTE user accesses a 2G network, and sending the notification message that the VoLTE user is registered in the 2G network to the HSS after the user is successfully registered through an additionally arranged interface between the HLR and the HSS; the system comprises an I-CSCF, an HSS and an application server, wherein the I-CSCF is used for sending an address query request for connecting a called VoLTE user to the HSS, receiving address information returned by the HSS to the MGCF under the condition that the called VoLTE user is registered in a 2G network, carrying an access code for identifying the VoLTE user to be registered in the 2G network, and sending an INVITE message to the MGCF, wherein the INVITE message carries the access code; MGCF, used for receiving INVITE message and sending IAM message to GMSC sent by I-CSCF, IAM message carries access code; and the GMSC is used for receiving the IAM message sent by the MGCF, acquiring the TLDN or RN of the user to the HLR and connecting the call to the called VoLTE user through the TLDN or RN.
The invention adds communication interface between HSS and HLR, when VoLTE user registers in 2G network, HLR informs HSS, so HSS can know that called VoLTE user accesses in 2G network, and indicates subsequent connection network element, to connect call to 2G network. Therefore, the called connection problem of the called VoLTE user when the HSS and the HLR are separated and the called VoLTE user is accessed in the 2G network is solved, and the call connection efficiency is improved.
In addition, the HSS can know the registration condition of the VoLTE user in the 2G network, and the HSS can indicate that the subsequent connection network element does not acquire the access network of the user through the access domain selection server any more and complete the call connection process, so that the signaling overhead is reduced.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a flow diagram of a VoLTE user call addressing method of the prior art.
Fig. 2 shows a system architecture diagram of the VoLTE user call addressing method of the present disclosure.
Fig. 3 shows a flowchart of a VoLTE user registration method according to an exemplary embodiment of the present disclosure.
Fig. 4 shows a flowchart of a VoLTE user call addressing method according to an exemplary embodiment of the present disclosure.
Fig. 5 shows a flow diagram of a VoLTE user call addressing method according to another exemplary embodiment of the present disclosure.
Fig. 6 shows a schematic structural diagram of a home subscriber server HSS according to an exemplary embodiment of the present disclosure.
Fig. 7 shows a schematic structural diagram of a VoLTE user call addressing system according to an exemplary embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The scheme is provided for solving the problems that in the prior art, under the condition that the HSS and the HLR are separated and the called VoLTE user can only adopt sequential calling or simultaneous ringing when a 2G network is accessed, and the calling connection efficiency is low.
In the solution, as shown in fig. 2, an interface is newly added between the HSS and the HLR, for example, an MAP (Mobile Application Part) protocol may be used to exchange information through the interface, and after a VoLTE subscriber registers in a 2G network through the HLR, the HLR notifies the HSS of the information, so that the HSS can know that the called VoLTE subscriber accesses in the 2G network and instruct a subsequent connection network element to connect a call to the 2G network.
One embodiment of the VoLTE user registration procedure of the present invention is described below in conjunction with fig. 3.
Fig. 3 is a flowchart of a VoLTE subscriber registration method according to an embodiment of the present invention. As shown in fig. 3, the method of this embodiment includes:
step S302, the VoLTE user accesses the 2G network and sends a registration notification message to the HLR.
The registration notification message is, for example, REGNOT (registration notification message) in the CDMA network, and Location Update (Location Update) message in the GSM network, where MSID (Mobile Station Identifier) or IMSI (International Mobile Subscriber Identifier) is carried, and an MSC (Mobile switching center) or VLR (Visitor Location Register) currently registered by the VoLTE Subscriber is sent to the HLR.
And step S304, the HLR authenticates the VoLTE user, and returns a response message of successful registration to the VoLTE user after the authentication is successful.
The response message indicating successful registration is, for example, regnot in the CDMA network and Location Update ack (Location Update confirm) in the GSM network.
And step S306, the HLR sends a notification message that the VoLTE user is registered in the 2G network to the HSS through the interface between the added HLR and the HSS.
The HLR and HSS exchange information via an interface between them, for example, using a MAP protocol, but not limited to the examples given. The notification message sent by the HLR to the HSS that the VoLTE subscriber has been registered in the 2G network is, for example, an INFODIR message in the CDMA network and an active SS message in the GSM network, where the notification message carries the MSID and redirection Number, and the redirection Number may be, for example, an access code and a subscriber Number, and the access code is used to identify that the VoLTE subscriber is registered in the 2G network, so as to avoid repeated triggering in a subsequent connection process.
In step S308, the HSS returns a notification message reception response to the HLR.
The notification message reception response is, for example, an info dir message in the CDMA network and an Activate SS ack message in the GSM network.
In the method of the embodiment, the interface is newly added between the HLR and the HSS, and the HLR interacts with the HSS through a specific signaling, so that the HSS learns that the VoLTE subscriber is registered in the 2G network, and a basis is provided for subsequently connecting the call to the 2G network.
A flowchart of an embodiment of a VoLTE subscriber call addressing method of the present invention is described below with reference to fig. 4.
Fig. 4 is a flowchart of a VoLTE user call addressing method according to an embodiment of the present invention. As shown in fig. 4, the method of this embodiment includes:
step S402, the I-CSCF sends an address query request for continuing the called VoLTE user to the HSS, and correspondingly, the HSS receives the address query request.
The address query Request is, for example, an LIR (Location Immediate Request).
Step S404, the HSS judges whether the called VoLTE user is registered in the 2G network according to the VoLTE user registration information sent by the HLR, and returns an address query response, wherein the address query response carries the address information and the access code of the MGCF.
The VoLTE user registration information comprises a notification message which is sent by the HLR and used for the VoLTE user to register in the 2G network. The address inquiry response is, for example, LIA (location immediate Answer). The access code is used for identifying the registration of the VoLTE user in the 2G network, and each network element identifies that the user is registered in the 2G network through the access code in the subsequent call connection process, so that the repeated triggering process of reconnecting the call to the IMS domain is avoided.
Step S406, the I-CSCF sends an INVITE message to the MGCF, wherein the INVITE message carries an access code.
Step S408, the MGCF receives the INVITE Message and then sends an IAM (Initial Address Message) to the gateway mobile switching center GMSC, where the IAM Message carries an access code.
Wherein, the IAM message also carries the called user MSID, i.e. called user number and other information.
Step S410, GMCS sends route request to HLR after receiving IAM message.
The Routing request is, for example, a ROUTREQ message in the CDMA network and an SRI (Send Routing Info) message in the GSM network, where the Routing request carries information such as the MSID of the called subscriber, i.e., the number of the called subscriber.
At step S412, the HLR sends a routing request to the VLR.
The routing request is, for example, a ROUTREQ message in a CDMA network and a PRN (provider roaming number) message in a GSM network, where the routing request carries information such as the MSID of the called subscriber, i.e., the number of the called subscriber.
Step S414, the VLR sends a routing request response to the HLR, which carries the TLDN (Temporary Local Number) or RN (Roaming Number) of the called VoLTE subscriber.
Where TLDN is used in a CDMA network and RN is used in a GSM network, the route request response is, for example, a routreq message in the CDMA network and a PRN ack message in the GSM network. The TLDN is a temporary number distributed by VLR for user, and is used only once during connection, and the TLDN is released after connection is completed.
Step S416, HLR sends a routing request response to GMCS, where the routing request response carries the TLDN or RN of the called VoLTE subscriber.
Where the route request response is, for example, a routreq message in a CDMA network and an SRI ack message in a GSM network.
Step S418, the GMSC sends an IAM message to the VLR, which carries the TLDN or RN.
Step S420, the VLR receives the IAM message sent by the GMSC and connects the call to the called party.
In the method of the embodiment, the communication interface is added between the HSS and the HLR, and the HLR notifies the HSS when the VoLTE user registers in the 2G network, so that the HSS can know that the called VoLTE user accesses in the 2G network and indicate a subsequent connection network element to connect the call to the 2G network. Therefore, the called connection problem of the called VoLTE user when the HSS and the HLR are separated and the called VoLTE user is accessed in the 2G network is solved, and the call connection efficiency is improved. In addition, the HSS can know the registration condition of the VoLTE user in the 2G network, and the HSS can indicate that the subsequent connection network element does not acquire the access network of the user through the access domain selection server any more and complete the call connection process, so that the signaling overhead is reduced.
A flow chart of another embodiment of the VoLTE subscriber call addressing method of the present invention is described below with reference to fig. 5.
Fig. 5 is a flowchart of a VoLTE user call addressing method according to another embodiment of the present invention. As shown in fig. 5, the method of this embodiment includes:
step S502, the I-CSCF sends an address query request for continuing the called VoLTE subscriber to the HSS, and the HSS receives the address query request accordingly.
The address query request is, for example, LIR.
Step S504, the HSS judges whether the called VoLTE user is registered in the 2G network according to the VoLTE user registration information sent by the HLR, and returns an address query response, wherein the address query response carries the address information and the access code of the S-CSCF.
The VoLTE user registration information comprises a notification message which is sent by the HLR and used for the VoLTE user to register in the 2G network. The address inquiry response is, for example, LIA (location immediate Answer). The access code is used for identifying the registration of the VoLTE user in the 2G network, and each network element identifies that the user is registered in the 2G network through the access code in the subsequent call connection process, so that the repeated triggering process of reconnecting the call to the IMS domain is avoided.
Step S506, the I-CSCF sends an INVITE message to the S-CSCF, wherein the INVITE message carries the access code.
Step S508, the S-CSCF sends an INVITE message to the MGCF, where the INVITE message carries the access code.
Step S510, the MGCF receives the INVITE Message and then sends an IAM (Initial Address Message) to the gateway mobile switching center GMSC, where the IAM Message carries an access code.
Wherein, the IAM message also carries the called user MSID, i.e. called user number and other information.
Step S512, the GMCS sends a routing request to the HLR after receiving the IAM message.
The Routing request is, for example, a ROUTREQ message in the CDMA network and an SRI (Send Routing Info) message in the GSM network, where the Routing request carries information such as the MSID of the called subscriber, i.e., the number of the called subscriber.
At step S514, the HLR sends a routing request to the VLR.
The routing request is, for example, a ROUTREQ message in a CDMA network and a PRN (provider Roaming Number) message in a GSM network, where the routing request carries information such as the MSID of the called subscriber, i.e., the Number of the called subscriber.
Step S516, the VLR sends a routing request response to the HLR, where the TLDN (Temporary Local Number) or RN (Roaming Number) of the called VoLTE subscriber is carried.
Where TLDN is used in a CDMA network and RN is used in a GSM network, the route request response is, for example, a routreq message in the CDMA network and a PRN ack message in the GSM network. The TLDN is a temporary number distributed by VLR for user, and is used only once during connection, and the TLDN is released after connection is completed.
Step S518, the HLR sends a routing request response to the GMCS, where the routing request response carries the TLDN or RN of the called VoLTE subscriber.
Where the route request response is, for example, a routreq message in a CDMA network and an SRI ack message in a GSM network.
Step S520, the GMSC sends an IAM message to the VLR, which carries the TLDN RN.
In step S522, the VLR receives the IAM message sent by the GMSC and connects the call to the called party.
In the method of the embodiment, the communication interface is added between the HSS and the HLR, and the HLR notifies the HSS when the VoLTE user registers in the 2G network, so that the HSS can know that the called VoLTE user accesses in the 2G network and indicate a subsequent connection network element to connect the call to the 2G network. Therefore, the called connection problem of the called VoLTE user when the HSS and the HLR are separated and the called VoLTE user is accessed in the 2G network is solved, and the call connection efficiency is improved. In addition, the HSS can know the registration condition of the VoLTE user in the 2G network, and the HSS can indicate that the subsequent connection network element does not acquire the access network of the user through the access domain selection server any more and complete the call connection process, so that the signaling overhead is reduced.
The present invention also provides a home subscriber server HSS, which is described below with reference to fig. 6.
Fig. 6 is a block diagram of a home subscriber server HSS according to an embodiment of the present invention. As shown in fig. 6, the HSS60 includes:
an address query request receiving unit 602, configured to receive an address query request sent by the I-CSCF for performing a connection to the called VoLTE subscriber.
And a connection network element address sending unit 604, configured to determine, according to the VoLTE user registration information sent by the HLR, whether the called VoLTE user is registered in the 2G network, and return connection network element address information, so that the I-CSCF connects the call to the 2G network according to the connection network element address information under the condition that the called VoLTE user is registered in the 2G network.
The connection network element address sending unit 604 is configured to return address information of the MGCF when the called VoLTE user is registered in the 2G network, so that the I-CSCF connects the call to the 2G network through the MGCF; or, the connection network element address sending unit 606 is configured to return address information of the S-CSCF when the called VoLTE subscriber is registered in the 2G network, so that the I-CSCF connects the call to the 2G network through the S-CSCF and the MGCF.
As shown in fig. 6, the HSS may further include: a subscriber registration information receiving unit 606, configured to receive, through an interface between the added HLR and the HSS, a notification message that the VoLTE subscriber is registered in the 2G network, where the notification message is sent by the HLR.
The user registration information receiving unit 606 receives VoLTE user registration information sent by the HLR, wherein the VoLTE user registration information includes an access code and is used for identifying that a VoLTE user is registered in a 2G network; the information returned by the connecting network element address sending unit 604 to the I-CSCF also includes an access code.
The invention also provides a VoLTE user call addressing system, which is described below with reference to fig. 7.
Fig. 7 is a block diagram of a VoLTE subscriber call addressing system according to an embodiment of the present invention. As shown in fig. 7, the system 70 includes: HSS60, subscriber location register HLR702, interrogating call session control function entity I-CSCF704, media gateway control function entity MGCF706, gateway mobile switching centre GMSC708 in the previous embodiment,
and the HLR702 is configured to receive a registration notification message sent when the VoLTE subscriber accesses the 2G network, and send a notification message that the VoLTE subscriber has been registered in the 2G network to the HSS60 after the subscriber is successfully registered through the interface between the added HLR and the HSS.
The I-CSCF704 is configured to send an address query request for connecting a called VoLTE user to the HSS60, receive address information, which carries an access code and is used to identify that the VoLTE user is registered in the 2G network, returned by the HSS60 when the called VoLTE user is registered in the 2G network, and send an INVITE message, which carries the access code, to the MGCF 706.
MGCF706, configured to receive the INVITE message sent by I-CSCF704 and send an IAM message to GMSC708, where the IAM message carries an access code.
GMSC708, configured to receive the IAM message sent by MGCF706, acquire a TLDN or RN of the subscriber to HLR702, and connect the call to the called VoLTE subscriber through the TLDN or RN.
The system 70 may also comprise a serving call session control function, S-CSCF.
The I-CSCF704 is configured to send an address query request for connecting a called VoLTE user to the HSS60, receive address information, which carries an access code and is used to identify that the VoLTE user is registered in the 2G network, returned by the HSS60 when the called VoLTE user is registered in the 2G network, and send an INVITE message, which carries the access code, to the S-CSCF.
And the S-CSCF is configured to receive the INVITE message sent by the I-CSCF704, and send the INVITE message to the MGCF706, where the INVITE message carries an access code.
MGCF706, configured to receive the INVITE message sent by the S-CSCF, and send an IAM message to GMSC708, where the IAM message carries an access code.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A method for VoLTE user call addressing based on LTE voice service is characterized by comprising the following steps:
a Home Subscriber Server (HSS) receives an address query request which is sent by a query call session control function entity (I-CSCF) and used for continuing a called VoLTE user;
and the HSS judges whether the called VoLTE user is registered in the 2G network of the second generation mobile communication system or not according to the VoLTE user registration information sent by the user location register HLR, and returns the address information of the connection network element so that the I-CSCF connects the call to the 2G network according to the address information of the connection network element under the condition that the called VoLTE user is registered in the 2G network.
2. The method of claim 1, further comprising:
the HLR receives a registration notification message sent when the VoLTE user accesses the 2G network;
and the HLR sends a notification message that the VoLTE user is registered in the 2G network to the HSS after the user is successfully registered through an additionally arranged interface between the HLR and the HSS.
3. The method of claim 1, wherein the HSS returns address information of a media gateway control function entity MGCF in case the called VoLTE subscriber is registered in the 2G network, so that the I-CSCF connects the call to the 2G network through the MGCF;
or, the HSS returns the address information of the service call session control function entity S-CSCF under the condition that the called VoLTE user is registered in the 2G network, so that the I-CSCF connects the call to the 2G network through the S-CSCF and the MGCF.
4. The method of claim 1, wherein the VoLTE subscriber registration information sent by the HLR to the HSS includes an access code identifying that the VoLTE subscriber is registered with the 2G network; the information returned by HSS to I-CSCF also includes the access code.
5. The method of claim 4, wherein the I-CSCF interfacing the call to the 2G network comprises:
the I-CSCF sends an INVITE message to the MGCF, wherein the INVITE message carries the access code;
MGCF receives INVITE message and then sends initial address message IAM to gateway mobile switching center GMSC, wherein IAM carries the access code;
after receiving the IAM message, the GMCS acquires a temporary local number TLDN or a roaming number RN of the user from the HLR, and continues the call to the called VoLTE user through the TLDN or the RN;
or,
the I-CSCF sends an INVITE message to the S-CSCF, wherein the INVITE message carries the access code;
S-CSCF sends INVITE message to MGCF, wherein carry the said access code;
MGCF receives INVITE message and then sends IAM message to GMSC, the IAM message carries the access code;
after receiving the IAM message, the GMCS acquires the TLDN or RN of the user from the HLR, and connects the call to the called VoLTE user through the TLDN or RN.
6. A home subscriber server, HSS, comprising:
the device comprises an address query request receiving unit, a service processing unit and a service processing unit, wherein the address query request receiving unit is used for receiving an address query request which is sent by an I-CSCF and used for continuing a called VoLTE user;
and the connection network element address sending unit is used for judging whether the called VoLTE user is registered in the 2G network or not according to the VoLTE user registration information sent by the HLR and returning connection network element address information so that the I-CSCF can connect the call to the 2G network according to the connection network element address information under the condition that the called VoLTE user is registered in the 2G network.
7. The HSS of claim 6, further comprising:
and the user registration information receiving unit is used for receiving a notification message that the VoLTE user is registered in the 2G network and sent by the HLR through an interface between the added HLR and the HSS.
8. The HSS of claim 6,
the connection network element address sending unit is used for returning the address information of the MGCF under the condition that the called VoLTE user is registered in the 2G network, so that the I-CSCF can connect the call to the 2G network through the MGCF;
or, the connection network element address sending unit is used for returning the address information of the S-CSCF when the called VoLTE user registers in the 2G network, so that the I-CSCF connects the call to the 2G network through the S-CSCF and the MGCF.
9. The HSS of claim 6,
the user registration information receiving unit receives VoLTE user registration information sent by the HLR, wherein the VoLTE user registration information comprises an access code and is used for identifying that a VoLTE user is registered in a 2G network;
the information returned by the connection network element address sending unit to the I-CSCF also comprises the access code.
10. A VoLTE subscriber call addressing system, comprising: a home subscriber server HSS, a subscriber location register HLR, a query call session control function entity I-CSCF, a media gateway control function entity MGCF, a gateway mobile switching centre GMSC according to any of claims 6-9;
the HLR is used for receiving a registration notification message sent when the VoLTE user accesses the 2G network, and sending the notification message that the VoLTE user is registered in the 2G network to the HSS after the user is successfully registered through an additionally arranged interface between the HLR and the HSS;
the I-CSCF is used for sending an address query request for continuing a called VoLTE user to the HSS, receiving address information returned by the HSS to the MGCF under the condition that the called VoLTE user is registered in the 2G network, wherein the address information carries an access code for identifying the VoLTE user to be registered in the 2G network, and sending an INVITE message to the MGCF, wherein the INVITE message carries the access code;
the MGCF is used for receiving the INVITE message sent by the I-CSCF and sending an IAM message to the GMSC, wherein the IAM message carries the access code;
and the GMSC is used for receiving the IAM message sent by the MGCF, acquiring the TLDN or RN of the user from the HLR and connecting the call to the called VoLTE user through the TLDN or RN.
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