WO2017185943A1 - Communication method and network elements used in communication method - Google Patents

Abstract

Provides are the present invention are a communication method and network elements used in the communication method. The communication method comprises: a convergence network element receives a first call request message sent by equipment of a first user in a first communication network, the first call request message is used to call equipment of a second user for the equipment of the first user; the first communication network is registered to an IMS network by means of the convergence network element as an IMS network registered user, and communicates with the IMS by means of the convergence network element; the convergence network element routes the first call request message to the equipment of the second user by means of a first network element in the IMS network, the first network element being used to provide IMS services for a registered user of the IMS network. The technical solutions of embodiments of the present invention allow other communication networks to easily and quickly trigger the services provided by an IMS network.

Description

Network element used in communication method and communication method

The present application claims priority to Chinese Patent Application No. 201610265489.4, entitled "Communication Method and Network Element Used in Communication Method", filed on April 26, 2016, the entire contents of In this application.

Technical field

The present invention relates to the field of communications, and in particular, to an aggregation network element and other network elements used in a communication method and a communication method.

Background technique

Internet Protocol Multimedia Subsystem (IMS) is a subsystem of the third generation mobile communication network that supports Internet Protocol (IP) multimedia services. It is independent of access technology and is based on IP channel. A new form of multimedia business. IMS is a multimedia control/call control platform on a Packet Switched Domain (PS). IMS enables PS to have some functions of Circuit Switched Domain (CS), supporting both session and non-session multimedia services. . Networks such as IMS and voice or data networks can communicate with each other. However, since the IMS network and other communication networks with which it communicates are peer-to-peer (or parallel), users under the communication network with which they communicate need to trigger the services provided in the IMS network. The communication network is cut onto the IMS network, which leads to a huge amount of network transformation.

Summary of the invention

The present invention provides a network element used in a communication method and a communication method, so that other communication networks can trigger the service provided by the IMS network simply and quickly.

In a first aspect, the present invention provides a communication method, including: an aggregation network element receives a first call request message sent by a first user equipment in a first communication network, where the first call request message is used for the first A user equipment calls a second user equipment, and the first communication network is registered by the aggregation network element to an Internet Protocol Multimedia Subsystem (IMS) network as a registered user of the IMS network, and the aggregation network element and the IMS are Communicating; the aggregation network element routes the first call request message to the second user equipment by using a first network element in the IMS network, where the first network element is used for the IMS network Registered users provide IMS services.

In the communication method of the embodiment of the present invention, the call request message of the user equipment in the communication network of the user registered as the IMS network may be routed to the called user via the aggregation network element and the network element serving the user equipment, thereby making the user The device can depart from the services in the IMS network.

In a possible implementation manner, the method further includes: the aggregation network element registering the first communication network to the IMS network.

In the embodiment of the present invention, the communication network is registered by the aggregation network element as a user of the IMS network, so that the user equipment of the communication network can trigger the service of the IMS network.

In a possible implementation, the aggregation network element registers the first communication network with the IMS network, including: the aggregation network element is between the first communication network and the aggregation network element. Link status changed from failed to normal Initiating a registration process to a Home Subscriber Server (HSS) in the IMS network; the aggregation network element receives a registration response message sent by the HSS, where the registration response message carries the first network The information of the element is recorded by the first network element and the first network element, wherein the first network element passes the first network element in the IMS network Before the call request message is routed to the second user equipment, the method further includes: determining, by the aggregation network element, the first network element according to the correspondence between the first user equipment and the first network element.

In the embodiment of the present invention, the aggregation network element initiates the registration process of the communication network according to the link status, and the communication network can be called the registered user of the IMS network when the link status is normal; after the registration is successful, the aggregation network element records When the user equipment is associated with the network element that provides the service for the user equipment, the aggregation network element can determine the network element that provides the service for the user equipment, so that the network element is User equipment provides services.

In a possible implementation, the method further includes: the aggregation network element receiving a second call request message sent by a second network element of the IMS network, where the second call request message is used as a third The user equipment calls a fourth user equipment in the second communication network, where the second communication network is registered to the IMS network by using the aggregation network element, and the second communication network passes the aggregation network element and the IMS network Communication, the second network element is configured to provide an IMS service for a registered user of the IMS network; the aggregation network element routes the third call request to the fourth user equipment by using the second communication network.

In the embodiment of the present invention, the aggregation network element may route a call request message of any user in the IMS network to a communication network of a user who has registered as an IMS network.

In a possible implementation manner, the communication method further includes: when the link state between the second communication network and the aggregation network element is changed from a failure to a normal, the aggregation network element sends the IMS to the IMS. The HSS in the network initiates a registration process; the aggregation network element receives the registration response message sent by the HSS, and the registration response message carries information of the third network element; the aggregation network element records the third user equipment and the Corresponding relationship of the third network element, wherein the method further includes: before the aggregation network element routes the second call request message to the fourth user equipment by using a third network element in the IMS network, the method further includes The aggregation network element determines the third network element according to the correspondence between the third user equipment and the third network element.

In a possible implementation manner, the method further includes: the aggregation network element configuring, for the third user equipment, a calling number for displaying on the fourth user equipment, where the fourth call is The calling number is carried in the request message.

In a possible implementation manner, the first network element is a service-call session control function S-CSCF, and the first communication network is any one of the following communication networks: a public switched telephone network PSTN, a public land mobile network PLMN, Next Generation Network NGN, IMS Network, and Evolved Packet Core (EPC) network.

In a possible implementation manner, the method further includes: the aggregation network element queries a second aggregation network element of the second IMS network by using the first network element, so that the IMS network and the second IMS The network communicates through the connection between the aggregation network element and the second aggregation network element.

In a second aspect, the present invention provides a communication method, including: a first network element in an IMS network receives a call request message, where the call request message is used to call a first user equipment of a second user equipment of a first communication network The first communication network is a registered user of the IMS network; the first network element sends an aggregation network element query request message to the second network element in the IMS network, where the aggregation network element query request message carries Information of the second user equipment, the The second network element is configured with a corresponding relationship between the at least one user equipment and the aggregation network element; the first network element receives the aggregation network element query result message sent by the second network element, and the aggregation network element query request message carries The information of the first aggregation network element, where the first aggregation network element is an aggregation network element corresponding to the second user equipment determined by the second network element according to the at least one correspondence relationship.

In the communication method of the embodiment of the present invention, the network element in the IMS network may determine, by the user equipment, the aggregation network element corresponding to the user equipment of the user equipment, so that the call request message of the user equipment may be routed to the aggregation through the aggregation network element. A communication network in which a network element communicates with an IMS network.

In a possible implementation, the first network element is a service-call session control function S-CSCF, and the second network element is an Enhanced Name Server (ENS), the first communication network. It is any of the following communication networks: Public Switched Telephone Network PSTN, Public Land Mobile Network PLMN, Next Generation Network NGN, IMS Network, and EPC Network.

In a third aspect, the present invention provides a communication method, including: a first network element in an IMS network of an Internet Protocol Multimedia Subsystem receives an aggregation network element query request message sent by a second network element in the IMS network, The aggregation network element query request message carries information of the user equipment, and the communication network to which the user equipment belongs is a registered user of the IMS network, and the first network element is configured with a correspondence between multiple user equipments and an aggregation network element. The second network element is configured to provide an IMS service for the user equipment; the first network element determines, according to the corresponding relationship and information about the user equipment, a first aggregation network element, where the first communication network passes Registering, by the first aggregation network element, the IMS network as a registered user of the IMS network, and communicating with the IMS network by using the first aggregation network element; the first network element is sent to the second network The element sends the aggregation network element query result message, and the aggregation network element query result message carries the information of the aggregation network element.

In the communication method of the embodiment of the present invention, the network element in the IMS network may determine, by the user equipment, the aggregation network element corresponding to the user equipment of the user equipment, so that the call request message of the user equipment may be routed to the aggregation through the aggregation network element. A communication network in which a network element communicates with an IMS network.

In a possible implementation manner, the first network element is an ENS, the second network element is a service-call session control function S-CSCF, and the communication network is any one of the following communication networks: a public switched telephone Network PSTN, Public Land Mobile Network PLMN, Next Generation Network NGN, IMS Network, and EPC Network.

In a fourth aspect, the present invention provides a communication method, including: a network element receiving a call request message sent by a user equipment in a communication network; and the network element routing the call message to an aggregation network element by using data transformation, The communication network is registered as a user of the IMS network by the aggregation network element.

In the communication method of the embodiment of the present invention, the complexity of the routing data configured on the convergence point can be reduced.

In a possible implementation manner, the communication network is a PSTN, a PLMN, an NGN, an IMS, or an EPC.

In a fifth aspect, an embodiment of the present invention provides an aggregation network element, where the aggregation network element includes a module for performing the communication method of the first aspect.

In a sixth aspect, the present invention provides a network element in an IMS network, the network element being used to execute a module of the communication method of the second aspect.

In a seventh aspect, the present invention provides a network element in an IMS network, the network element being used to execute a module of the communication method of the third aspect.

In an eighth aspect, the present invention provides a network element in a communication network, the network element being used to execute a module of the communication method of the fourth aspect.

In a ninth aspect, the present invention provides an IMS, where the IMS includes the aggregation network element in the fifth aspect or the network element in the sixth aspect or the seventh aspect.

In a tenth aspect, the present invention provides an aggregation network element, where the aggregation network element includes a memory, a processor, a receiver, and a transmitter. The memory is for storing programs, the processor is for executing programs, and the receiver and transmitter are for communicating with other network elements. The processor and its receiver and transmitter perform the method of the first aspect when the program is executed.

In an eleventh aspect, the present invention provides a network element in an IMS, the network element including a memory, a processor, a receiver, and a transmitter. The memory is for storing programs, the processor is for executing programs, and the receiver and transmitter are for communicating with other network elements. The processor and its receiver and transmitter perform the method of the second aspect when the program is executed.

In a twelfth aspect, the present invention provides a network element in an IMS, the network element including a memory, a processor, a receiver, and a transmitter. The memory is for storing programs, the processor is for executing programs, and the receiver and transmitter are for communicating with other network elements. The processor and its receiver and transmitter perform the method of the third aspect when the program is executed.

In a thirteenth aspect, the present invention provides a network element in a communication network, the network element comprising a memory, a processor receiver and a transmitter. The memory is for storing programs, the processor is for executing programs, and the receiver and transmitter are for communicating with other network elements. The processor and its receiver and transmitter perform the method of the fourth aspect when the program is executed.

In a fourteenth aspect, the present invention provides a computer readable medium storing program code for aggregating network element execution, the program code comprising instructions for performing the method of the first aspect.

In a fifteenth aspect, the present invention provides a computer readable medium storing program code for execution by a network element in an IMS, the program code comprising instructions for performing the method of the second aspect .

In a sixteenth aspect, the present invention provides a computer readable medium storing program code for execution by a network element in an IMS, the program code comprising instructions for performing aspects of the third aspect .

In a seventeenth aspect, the present invention provides a computer readable medium storing program code for execution by a network element in a communication network, the program code comprising means for performing aspects of the fourth aspect instruction.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic architectural diagram of a network to which a communication method of an embodiment of the present invention is applied.

2 is a schematic architectural diagram of a network composed of an IMS network and other communication networks.

3 is a schematic architectural diagram of a network to which a communication method of an embodiment of the present invention is applied.

4 is a schematic flowchart of a method for an aggregation network element to register a communication network as a user of an IMS network according to an embodiment of the present invention.

FIG. 5 is a schematic flowchart of a communication method according to an embodiment of the present invention.

FIG. 6 is a schematic structural diagram of an aggregation network element according to an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a network element in an IMS network according to an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a network element in an IMS network according to an embodiment of the present invention.

FIG. 9 is a schematic structural diagram of a network element in a communication network according to an embodiment of the present invention.

FIG. 10 is a schematic structural diagram of an aggregation network element according to an embodiment of the present invention.

FIG. 11 is a schematic structural diagram of a network element in an IMS network according to an embodiment of the present invention.

FIG. 12 is a schematic structural diagram of a network element in an IMS network according to an embodiment of the present invention.

FIG. 13 is a schematic structural diagram of a network element in a communication network according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

For ease of understanding, a schematic architecture diagram of an IMS network is first introduced in conjunction with FIG. It should be understood that the architecture shown in FIG. 1 is only an exemplary description. The IMS network involved in the implementation of the communication method of the embodiment of the present invention may include more or fewer network elements, that is, the IMS network involved in the embodiment of the present invention. Not limited to the IMS architecture shown in FIG. In addition, the network element in FIG. 1 may be hardware, or may be a functionally divided software or a structure of the above two.

The network architecture illustrated in Figure 1 consists of an IMS network and other networks interconnected with the IMS network. The IMS network can be divided into five parts: the service layer, the session control and media resource layer, the interworking layer, the operation support layer, and the access and bearer control layer.

The business layer is mainly composed of various application servers (ASs) and resource servers, and provides various services (such as games, conferences, instant messages, etc.) and business capabilities (groups, media resources, etc.).

Operators can combine business capabilities into different services according to their own needs, so as to achieve the purpose of quickly launching services.

The session control and media resource layer mainly complete functions such as registration, authentication, session path control, service triggering, topology hiding, routing, resource control, and interworking. The access gateway control function (Access Gateway Control Functio, AGCF) and services are mainly used. -Serving-Call Session Control Function (S-CSCF), Interrogating-Call Session Control Function (I-CSCF), Multimedia Resource Function Controller, MRFC), User Subscriber Server (HSS) and Proxy-Call Session Control Function (P-CSCF).

The access and bearer control layer is connected to the access network, and mainly provides a Service Based Local Policy (SBLP) and a Quality of Service (QoS) resource based on Service Based Bear Control (SBBC). Control, control the resources of the access network through the Policy and Charging Rules Function (PCRF).

The interworking layer completes the interworking between the IMS network and the networks such as the Public Switched Telephone Network (PSTN), the Public Land Mobile Network (PLMN), and the Next Generation Network (NGN).

IMS network and public switched telephone network (PSTN), PLMN and other networks The interworking of the network can be completed by the Media Gateway Control Function (MGCF). The signaling conversion can be completed by the Signaling Gateway (SG), and the media is converted by the IP Multimedia-Media Gateway. IM-MGW), IM-MGW can also have built-in SG function.

The operation support layer mainly provides functions such as network management, subscription data storage, and billing, such as unified operation and addressing, and is composed of functional entities such as an element management system (EMS) and a domain name server (DNS).

The other networks in FIG. 1 may be communication networks such as PSTN, PLMN, NGN, IMS network, or EPC.

Next, an exemplary diagram of a system architecture capable of implementing the communication method of the embodiment of the present invention will be described as a whole in conjunction with FIG. It should be understood that the system architecture shown in FIG. 2 is merely an exemplary illustration, and the system architecture capable of implementing the communication method of the embodiment of the present invention is not limited to the system architecture shown in FIG. 2.

As shown in FIG. 2, a system capable of implementing the communication method of the embodiment of the present invention includes an IMS network 210, a communication network 220 communicating with the IMS network, and a communication network 240, and a communication communication network between each communication network and the IMS network. The convergence point 230 and the convergence point 250 are fixed. The IMS network 210 in FIG. 2 may be the IMS network in FIG. 1, and the communication network 220 and the communication network 240 in FIG. 2 may be the PSTN, PLMN, NGN, IMS network, or EPC in FIG.

It should be understood that the architecture shown in FIG. 2 is merely an exemplary illustration, that is, the system architecture applied in the embodiment of the present invention is not limited to the system architecture shown in FIG. 2. As shown in FIG. 2, there may be multiple aggregation points (such as a gateway office and/or a long distance office) or no aggregation point between the communication network 220 or the communication network 240 and the IMS. For example, the aggregation point 230 or the convergence point 250 may also aggregate the communication network 220. In addition to other communication networks, the IMS network 210 can also communicate with communication networks that are aggregated through other aggregation points, and the like.

As described in the background, since the IMS network 210 and the communication network 220 and the communication network 220 are in a peer-to-peer relationship, if the user under the communication network 220 or the communication network 240 wants to trigger the service provided in the IMS network, then The communication network 220 or communication network 240 needs to be handed over to the IMS network 210, which can result in a significant amount of network transformation. Therefore, embodiments of the present invention propose a new communication method to enable the communication network 220 or the communication network 240 to trigger the service provided by the IMS network 210 simply and quickly.

The communication method of the embodiment of the present invention needs to introduce a new functional network element in the IMS network 210, which may be referred to as an aggregation network element. The aggregation network element may multiplex the existing network element in the IMS network to implement the function of the aggregation network element in the embodiment of the present invention, or may be a new network element in the IMS network. Of course, the aggregation network element may not belong to the IMS network, but only the network element that communicates between the communication network (or convergence point) and the IMS network.

After the aggregation network element is introduced in the IMS network, the system architecture of the communication method of the embodiment of the present invention is shown in FIG. 3. The same reference numerals in FIG. 3 as those in FIG. 2 denote the same meanings, and are not described herein again for the sake of brevity.

As shown in FIG. 3, communication network 210 and aggregation point 230 communicate with the IMS network through aggregation network element 211 in IMS network 210. Communication network 240 and aggregation point 250 communicate with the IMS network through aggregation network element 212 in IMS network 210. The aggregation network element 211 and/or the aggregation network element 212 can be an AGCF in the IMS network.

In the communication method of the embodiment of the present invention, the communication network with which it communicates and the convergence point between them are taken as a whole, or the convergence point between the communication network and the communication network to the aggregation network element is taken as a network to the IMS. Network registration makes this network as a whole called a registered user of the IMS network. If there is no aggregation point, the communication network is registered as a user of the IMS as a whole. All users in this network as a whole can trigger the services, capabilities or services provided in the IMS network. That is, in the embodiment of the present invention, a large network transformation amount is not required, so that users in other communication networks can trigger services and the like in the IMS network.

In the embodiment of the present invention, the communication network and the aggregation point may be registered by the aggregation network element as users of the IMS network. A schematic flowchart of a method for registering a communication network as an IMS user according to an embodiment of the present invention is described below with reference to FIG. It should be understood that the steps or operations illustrated in FIG. 4 are merely examples, and that other operations of the present invention or variations of the various operations in FIG. 4 may be performed. Moreover, the various steps in FIG. 4 may be performed in a different order than that presented in FIG. 4, and it is possible that not all operations in FIG. 4 are to be performed.

S402. The aggregation network element monitors a link state between the aggregation network element and the convergence point. If there is no aggregation point between the communication network and the aggregation network element, the aggregation network element monitors the link status between the communication network and the communication network. The link status can generally be classified as either failed or normal.

S404. When the aggregation network element detects that the link status changes from failure to normal, the aggregation network element initiates a registration process to the HSS in the IMS network.

S406, when the registration is successful, the HSS determines an S-CSCF in the IMS network that can provide services for users in the communication network, and a service (capability or service) that the user in the communication network can trigger in the IMS network.

S408. The HSS sends the information of the determined S-CSCF in S406 to the aggregation network element.

S410: After receiving the message of the S-CSCF sent by the HSS, the aggregation network element records the correspondence between the S-CSCF and the user equipment in the communication network (or may be referred to as a binding relationship).

The method for registering a communication network as an IMS user in the embodiment of the present invention, the communication network (and the convergence point) as a whole, is registered as a user of the IMS network, so that the user in the communication network can trigger the service in the IMS network as the user of the IMS. .

In the embodiment of the present invention, the network element that can provide services for users in the communication network in the IMS network is not limited to the S-CSCF. Therefore, in the registration process, the HSS may determine other network elements, that is, the aggregation network element, for the user equipment. The record may be the correspondence between other network elements and user equipment.

In the implementation of the present invention, when the communication network is registered as an IMS user, the user equipment in the communication network can have two account opening methods in the IMS network, one is a wildcard account opening, and the other is a single user account opening.

Optionally, when the aggregation network detects that the link state between the network and the communication network (or the aggregation point) is a failure, the aggregation network element may initiate a logout process to the HSS. After the logout is successful, the aggregation NE can delete the mapping between the user equipment and the S-CSCF in the recorded communication network.

Optionally, in the embodiment of the present invention, the communication network registered as the IMS network by the aggregation network element may be any type of voice communication network. For example, the communication network may be a voice communication network such as PSTN, PLMN, NGN, IMS network or EPC. That is to say, the implementation of the present invention can unify all voice communication networks and change the chaos caused by the coexistence of multiple types of networks.

Moreover, in the embodiment of the present invention, a multi-layer communication network can also be aggregated in the communication network that communicates with the aggregation network element. Regardless of how many levels of communication networks are aggregated in the communication network, these communication networks can be registered as a whole by the aggregation network element as a user of the IMS network.

A schematic flowchart of a communication method according to an embodiment of the present invention is described below after the communication network is registered as a user of the IMS network. It should be understood that FIG. 5 illustrates steps or operations of the communication method, but these steps or operations are merely examples, and embodiments of the present invention may perform other operations or variations of the various operations in FIG. 5. Moreover, the various steps in FIG. 5 may be performed in a different order than that presented in FIG. 5, and it is possible that not all operations in FIG. 5 are to be performed.

S510. The communication network 501 sends a call request message of the first user equipment in the communication network 501 to the aggregation network element 502, where the call request message is used to call the second user equipment in the communication network 502.

The aggregation network element may be an internal network element of the IMS network. Communication network 501 may be a user registered by the aggregation network element 502 to the IMS network, and communication network 506 may be a user registered by the aggregation network element 505 to the IMS network. The communication network 501 and the communication network 506 may be the same network. In this case, the aggregation network element 502 and the aggregation network element 505 are the same aggregation network element.

The call request message may be sent by the communication network 501 directly to the aggregation network element 502, or may be a convergence point (such as a gateway office and/or a long distance office) between the communication network 501 and the aggregation network element 502, which is routed from the communication network 501 to Converged network element 502.

Specifically, if the communication protocol between the communication network and the aggregation network element is a Session Initiation Protocol (SIP), the call request message may be an “Invite message”; if the communication between the communication network and the aggregation network element is The protocol is an Integrated Services Digital Network (ISDN) protocol, and the call request message may be a “setup message”; if the communication protocol between the communication network and the aggregation network element is an ISDN User Part (ISUP) The protocol, the call request message may be "Identity and Access Management (IAM); if the communication protocol between the communication network and the aggregation network element is a Telephone User Part (TUP) protocol, The call request message may be an "IAM message"; if the communication protocol between the communication network and the aggregation network element is the V5.2 protocol, the call request message may be an "establish message".

S512. After receiving the call request message of the second user equipment by the first user equipment, the aggregation network element 502 records the user equipment and the IMS network in the communication network 502 according to the registration of the communication network 502 as the user of the IMS network. The corresponding relationship of the S-CSCF determines the S-CSCF 503 corresponding to the first user equipment in the IMS network. The S-CSCF 503 corresponding to the first user equipment is an S-CSCF in the plurality of S-CSCFs of the IMS network that can provide services (services or capabilities) for the first user equipment.

S514. After determining, by the first user equipment, the S-CSCF 503, the aggregation network element 502 routes the call request message of the first user equipment to the S-CSCF 503.

S516. After receiving the call request message sent by the aggregation network element 502, the S-CSCF 503 sends an aggregation network element query message to the ENS 504 in the IMS, requesting the ENS to query the convergence network corresponding to the second user equipment of the first user equipment call. yuan. The correspondence between multiple aggregation network elements and user equipments in the registered communication network is recorded in the ENS.

The aggregate network element query request message sent by the S-CSCF 503 to the ENS 504 may be a call request message received by the S-CSCF 503 from the aggregation network element 502, or may be another message carrying the second user equipment information.

It should be noted that the network element for recording the corresponding relationship between the aggregation network element and the user equipment in the IMS network and the querying the aggregation network element corresponding to the user equipment according to the corresponding relationship is not limited to the ENS in the IMS network.

S518. The ENS 504 queries the aggregation network element corresponding to the second user equipment as the aggregation network element 505 according to the corresponding relationship between the aggregation network element and the user equipment.

S520, the ENS 504 queries the aggregation network element corresponding to the second user equipment to be the aggregation network element 505, and feeds back the information of the aggregation network element 505 to the S-CSCF 503, that is, informs the S-CSCF 503 of the aggregation network element corresponding to the second user equipment. It is an aggregation network element 505.

S522. After the S-CSCF 503 obtains the aggregation network element corresponding to the second user equipment that is the first user equipment call from the ENS, the aggregation network element is the aggregation network element 505, and the call request message of the first user equipment to the second user equipment is routed to the convergence. Network element 505.

S524. After receiving the call request message of the first user equipment and calling the second user equipment, the aggregation network element 505 may route the call request message to the communication network 506, and then continue to route the call request message in the communication network 506 until the The call request message arrives at the second user equipment.

When there is a convergence point (such as a tandem office and/or a long distance office) between the communication network 506 and the aggregation network element 505, the aggregation network element The 505 first routes the call message to the aggregation point, and the aggregation point routes the call request message to the communication network 506.

Correspondingly, when the second user equipment in the communication network 506 calls the first user equipment in the communication network 501, the specific procedure is similar to the above steps, and details are not described herein again.

Optionally, in the embodiment of the present invention, the second user equipment that is called by the first user equipment in the communication network 501 may not be the user equipment in the communication network of the user who has registered as the IMS network, but may be the ordinary in the IMS network. user. At this time, the aggregation network element 502 routes the call request message of the first user equipment to the S-CSCF 503, and the S-CSCF 503 may not request the ENS to query the aggregation network element corresponding to the second user equipment, but directly request the call. The message is routed to the second user equipment.

Optionally, in the embodiment of the present invention, the user equipment of the second user equipment in the call communication network 506 may not be the user equipment in the communication network of the user who has registered as the IMS network, but may be an ordinary user in the IMS network. . At this time, the call request message for calling the second user equipment is not routed from the aggregation network element to the S-CSCF, but may be routed to the S-CSCF by other means, and then the S-CSCF requests the ENS to query the corresponding corresponding to the second user equipment. Aggregate network elements to continue the follow-up process.

In the embodiment of the present invention, whether the user equipment in the communication network 501 calls the user equipment in the communication network 506 or the user equipment in the communication network 506 calls the user equipment in the communication network 501, since the communication network 501 and the communication network 506 are Registered users of the IMS network, and thus the user equipment in the communication network 501 and the communication network 506 can use the capabilities in the IMS network like other ordinary registered users in the IMS network.

For example, the user equipment in the communication network 501 and the communication network 506 can trigger the supplementary service and/or the intelligent service on the application server (AS) in the IMS network; the charging bill can also be sent through the AS; The capabilities of monitoring, operation and maintenance, performance statistics, message tracking, and service delivery in the IMS network.

Optionally, in the embodiment of the present invention, after receiving the call request message of the second user equipment in the first user equipment call communication network 506, the aggregation network element 505 may configure a calling number for the first user equipment according to requirements. Then, when the call request message is routed to the communication network 506, the configured calling number can be sent to the communication network 506 together, such that the second user equipment displays the main message on the second user equipment after receiving the call request message. The calling number is the calling number configured by the aggregation network element 505 for the first user equipment.

Of course, the aggregation network element 505 may not configure a new calling number for the first user equipment. In this case, the real number of the first user equipment is displayed on the second user equipment, that is, the network where the first user equipment is located is The number of its configuration.

Optionally, in the network architecture of the embodiment of the present invention, as shown in FIG. 3, the communication between the user equipment in the communication network 220 and the user equipment in the communication network 240 may also use the communication in the network architecture as shown in FIG. 2. The manner of communication between the user equipment in network 220 and the user equipment in communication network 240. For example, when the communication network 220 and the communication network 240 are the same communication network, when the first user equipment in the communication network calls the second user equipment, the call request message can be directly routed to the second user equipment through the convergence point, instead of Route to the aggregation network element. This makes the communication network networking more flexible and the evolution will be smoother.

In the network architecture shown in FIG. 2, when a user equipment in the communication network 240 initiates a call to a user equipment in the IMS network, the call request message needs to pass through one or more convergence points (such as sinks) between the communication network 240 and the IMS network. The route and/or the long distance office are routed separately. That is to say, complex routing data needs to be configured on these aggregation points to route the call request message of the user equipment in the communication network 240 to the IMS network.

The communication method of the embodiment of the present invention is applied, that is, in the network architecture shown in FIG. 3, when a call request message of a user equipment in the communication network 240 is routed to the aggregation network element 212 through one or more aggregation points, due to the call request Message The route needs to be routed to the aggregation network element 212, and the path of the aggregation point to the aggregation network element is determined. Therefore, the aggregation points need not be configured with complicated routing data, but only need to configure these aggregation points to the aggregation network element. The routing data between 212 and the nearest one can be. Thus, when a call request message is routed to these aggregation points, the aggregation points can be routed to the next aggregation point by routing the data to the aggregation network element 212.

When the communication network 240 in the network architecture of the embodiment of the present invention as shown in FIG. 3 is an IMS network (for the convenience of subsequent description, the IMS network becomes the second IMS network), the second IMS network may also include its own The aggregation network element (for the convenience of subsequent description, the IMS network becomes the second aggregation network element). In this way, the IMS network 210 and the second IMS network can communicate with each other through the aggregation network element 212 and the second aggregation network element, and different through the fixed aggregation point 250, thereby saving Time Division Multiplexing (TDM) resources. Of course, the entire network architecture is also flatter.

The foregoing describes the network architecture of the embodiment of the present invention, the method for the aggregation network element to register the communication network as the user of the IMS network, the communication method under the network architecture and the communication method of the convergence point according to the embodiment of the present invention, and the following describes the embodiment of the present invention. The network element that implements the above method.

FIG. 6 is a schematic structural diagram of an aggregation network element 600 according to an embodiment of the present invention. The aggregation network element 600 shown in FIG. 6 is capable of implementing the various steps performed by the aggregation in FIGS. 4 and 5.

The receiving module 610 is configured to receive a first call request message sent by the first user equipment in the first communications network, where the first call request message is used to call the second user equipment for the first user equipment, where A communication network is registered by the aggregation network element to the Internet Protocol Multimedia Subsystem (IMS) network as a registered user of the IMS network, and communicates with the IMS through the aggregation network element.

The sending module 620 is configured to route the first call request message to the second user equipment by using a first network element in the IMS network, where the first network element is used to register the IMS network The user provides IMS services.

In the embodiment of the present invention, the call request message of the user equipment in the communication network of the user registered as the IMS network may be routed to the called user via the aggregation network element and the network element serving the user equipment, so that the user equipment can be Departure from the services in the IMS network.

Optionally, as an embodiment, the aggregation network element further includes a registration module, configured to register the first communication network to the IMS network.

Optionally, as an embodiment, the registration module is specifically configured to: when the link state between the first communication network and the aggregation network element changes from a failure to a normal, to the IMS network The subscription user server HSS initiates a registration process, and receives a registration response message sent by the HSS, where the registration response message carries information of the first network element, and records a correspondence between the first user equipment and the first network element. The aggregation network element further includes a determining module, configured to determine the first network element according to the corresponding relationship between the first user equipment and the first network element.

Optionally, as an embodiment, the receiving module is further configured to receive a second call request message sent by a second network element of the IMS network, where the second call request message is used to call a third user equipment. a fourth user equipment in the second communication network, the second communication network is registered to the IMS network by the aggregation network element, and the second communication network communicates with the IMS network by using the aggregation network element, The second network element is configured to provide an IMS service for a registered user of the IMS network; the sending module is further configured to route the third call request to the fourth user equipment by using the second communication network.

Optionally, as an embodiment, the method further includes: a configuration module, configured to configure, for the third user equipment, a calling number for displaying on the fourth user equipment, where the fourth call request Carrying the caller in the message number.

Optionally, as an embodiment, the first network element is a service-call session control function S-CSCF, and the first communication network is any one of the following communication networks: a public switched telephone network PSTN, a public land mobile network PLMN, Next Generation Network NGN, IMS Network, and Evolved Packet Core EPC Network.

Optionally, as an embodiment, the aggregation network element further includes a querying module, configured to query, by the first network element, a second aggregation network element of the second IMS network, so that the IMS network and the second The IMS network communicates through a connection between the aggregation network element and the second aggregation network element.

FIG. 7 is a schematic structural diagram of a network element 700 in an IMS network according to an embodiment of the present invention. The network element 700 shown in FIG. 7 is capable of implementing the various steps performed by the S-CSCF in FIG.

The receiving module 710 is configured to receive a call request message, where the call request message is used to call the first user equipment of the second user equipment of the first communication network, where the first communication network is a registered user of the IMS network.

a 720 sending module, configured to send an aggregation network element query request message to a second network element in the IMS network, where the aggregation network element query request message carries information about the second user equipment, where the second network element is The mapping between the at least one user equipment and the aggregation network element is configured.

The receiving module 720 is further configured to receive, by the second network element, an aggregate network element query result message, where the aggregate network element query request message carries information of the first aggregation network element, where the first aggregation network element is the first The aggregation network element corresponding to the second user equipment determined by the second network element according to the at least one corresponding relationship.

In the embodiment of the present invention, the network element in the IMS network may determine, by the user equipment, the aggregation network element corresponding to the user equipment that the user equipment calls, so that the call request message of the user equipment may be routed to the network element through the convergence network element. Communication network for IMS network communication.

Optionally, as an embodiment, the first network element is a service-call session control function S-CSCF, the second network element is an enhanced domain name server ENS, and the first communication network is any one of the following communications. Network: Public Switched Telephone Network PSTN, Public Land Mobile Network PLMN, Next Generation Network NGN, IMS Network, and EPC Network.

FIG. 8 is a schematic structural diagram of a network element 800 in an IMS network according to an embodiment of the present invention. The network element 800 shown in Figure 8 is capable of implementing the various steps performed by ENS in Figure 5.

The receiving module 810 is configured to receive an aggregation network element query request message sent by the second network element in the IMS network, where the aggregation network element query request message carries information of the user equipment, where the communication network to which the user equipment belongs is For the registered user of the IMS network, the first network element is configured with a corresponding relationship between multiple user equipments and an aggregation network element, and the second network element is used to provide an IMS service for the user equipment.

a determining module 820, configured to determine, according to the correspondence relationship and information about the user equipment, a first aggregation network element, where the first communication network is registered to the IMS network by using the first aggregation network element as the IMS A registered user of the network and communicates with the IMS network through the first aggregation network element.

The sending module 830 sends an aggregation network element query result message, where the aggregate network element query result message carries the information of the aggregation network element.

In the embodiment of the present invention, the network element in the IMS network may determine, by the user equipment, the aggregation network element corresponding to the user equipment that the user equipment calls, so that the call request message of the user equipment may be routed to the network element through the convergence network element. Communication network for IMS network communication.

Optionally, as an embodiment, the first network element is an ENS, the second network element is a service-call session control function S-CSCF, and the communication network is any one of the following communication networks: a public switched telephone Network PSTN, public land Mobile network PLMN, next generation network NGN, IMS network, and EPC network.

FIG. 9 is a schematic structural diagram of a network element 900 in a communication network according to an embodiment of the present invention. The network element 900 includes a receiving module 910 and a transmitting module 920.

The receiving module 910 is configured to receive a call request message sent by a user equipment in a communication network.

The sending module 920 is configured to route the call message to the aggregation network element by using data transformation, and the communication network is registered by the aggregation network element as a user of the IMS network.

In the embodiment of the present invention, the network element 900 can reduce the complexity of the routing data configured on the aggregation point by routing the call request message through data transformation.

Optionally, as an embodiment, the communication network is a PSTN, a PLMN, an NGN, an IMS, or an EPC.

FIG. 10 is a schematic structural diagram of an aggregation network element 1000 according to an embodiment of the present invention. The aggregation network element 1000 includes a memory 1010, a processor 1020, a receiver 1030, and a transmitter 1040.

The memory 1010 is for storing programs.

The processor 1020 is configured to execute a program stored in the memory 1010.

Receiver 1030 is used. Receiving a first call request message sent by the first user equipment in the first communication network, where the first call request message is used to call the second user equipment for the first user equipment, where the first communication network passes the The aggregation network element registers with the Internet Protocol Multimedia Subsystem (IMS) network as a registered user of the IMS network, and communicates with the IMS through the aggregation network element.

The transmitter 1040 is configured to, when the processor 1020 executes the program, routing the first call request message to the second user equipment by using a first network element in the IMS network, where the first network element is used by An IMS service is provided for registered users of the IMS network.

In the embodiment of the present invention, the call request message of the user equipment in the communication network of the user registered as the IMS network may be routed to the called user via the aggregation network element and the network element serving the user equipment, so that the user equipment can be Departure from the services in the IMS network.

The aggregation network element 1000 of FIG. 10 can implement the steps performed by the aggregation network element in FIG. 4 and FIG. 5, and details are not described herein for brevity.

FIG. 11 is a schematic structural diagram of a network element 1100 in an IMS network according to an embodiment of the present invention. The network element 1100 includes a memory 1110, a processor 1120, a receiver 1130, and a transmitter 1140.

The memory 1110 is for storing programs.

The processor 1120 is configured to execute a program stored in the memory 1110.

Receiver 1130 is used. Receiving a call request message, the call request message is used to call a second user equipment of the first communication network for the first user equipment, where the first communication network is a registered user of the IMS network.

The sender 1140 is configured to send an aggregation network element query request message to the second network element in the IMS network, where the aggregation network element query request message carries information about the second user equipment, where the second network element is configured. There is a correspondence between at least one user equipment and an aggregation network element.

The receiver 1130 is further configured to receive, by the second network element, an aggregation network element query result message, where the aggregation network element query request message carries information of the first aggregation network element, where the first aggregation network element is the first The aggregation network element corresponding to the second user equipment determined by the second network element according to the at least one corresponding relationship.

In the embodiment of the present invention, the network element in the IMS network may determine, by the user equipment, the aggregation network element corresponding to the user equipment that the user equipment calls, so that the call request message of the user equipment may be routed to the network element through the convergence network element. IMS Communication network for network communication.

The network element 1100 of FIG. 11 can implement the steps performed by the S-CSCF in FIG. 5, and details are not described herein for brevity.

FIG. 12 is a schematic structural diagram of a network element 1200 in an IMS network according to an embodiment of the present invention. The network element 1200 includes a memory 1210, a processor 1220, a receiver 1230, and a transmitter 1240.

The memory 1210 is for storing programs.

The processor 1220 is configured to execute a program stored in the memory 1210.

The receiver 1230 is configured to receive an aggregation network element query request message sent by the second network element in the IMS network, where the aggregation network element query request message carries information of the user equipment, where the communication network to which the user equipment belongs is A registered user of the IMS network, where the first network element is configured with a corresponding relationship between multiple user equipments and an aggregation network element, and the second network element is used to provide an IMS service for the user equipment.

The processor 1220 is configured to determine, according to the correspondence relationship and information about the user equipment, a first aggregation network element, where the first communication network is registered to the IMS network by using the first aggregation network element as the IMS network. Registered user, and communicates with the IMS network through the first aggregation network element;

The sender 1240 is configured to send an aggregation network element query result message, where the aggregation network element query result message carries information of the aggregation network element.

In the embodiment of the present invention, the network element in the IMS network may determine, by the user equipment, the aggregation network element corresponding to the user equipment that the user equipment calls, so that the call request message of the user equipment may be routed to the network element through the convergence network element. Communication network for IMS network communication.

The network element 1200 of FIG. 12 can implement the steps performed by the ENS in FIG. 5, and details are not described herein for brevity.

FIG. 13 is a schematic structural diagram of a network element 1300 in a communication network according to an embodiment of the present invention. The network element 1300 includes a memory 1310, a processor 1320, a receiver 1330, and a transmitter 1340.

The memory 1310 is for storing programs.

The processor 1320 is configured to execute a program stored in the memory 1310.

The receiver 1330 is configured to receive a call request message sent by a user equipment in a communication network.

The transmitter 1340 is configured to route the call message to the aggregation network element by using data modification, and the communication network is registered by the aggregation network element as a user of the IMS network.

In the embodiment of the present invention, the network element 1300 can reduce the complexity of the routing data configured on the convergence point by routing the call request message through the data transformation.

Alternatively, the communication network may be a PSTN, a PLMN, an NGN, an IMS or an EPC.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative, for example, of the unit Partitioning is only a logical function partitioning. In actual implementation, there may be another way of dividing. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims (19)

A communication method, comprising: Receiving, by the first network device, a first call request message sent by the first user equipment in the first communication network, where the first call request message is used to call the second user equipment, the first communication network Registering, by the aggregation network element, an Internet Protocol Multimedia Subsystem (IMS) network as a registered user of the IMS network, and communicating with the IMS by using the aggregation network element; The aggregation network element routes the first call request message to the second user equipment by using a first network element in the IMS network, where the first network element is used as a registered user of the IMS network Provide IMS services. The communication method according to claim 1, wherein the method further comprises: The aggregation network element registers the first communication network to the IMS network. The communication method according to claim 2, wherein the aggregation network element registers the first communication network to the IMS network, including: When the link state between the first communication network and the aggregation network element changes from failure to normal, the aggregation network element initiates a registration process to the home subscription user server HSS in the IMS network; Receiving, by the aggregation network element, a registration response message sent by the HSS, where the registration response message carries information about the first network element; Recording, by the aggregation network element, a correspondence between the first user equipment and the first network element, The method further includes: before the first network element in the IMS network, the first call request message is sent to the second user equipment, the method further includes: The aggregation network element determines the first network element according to the correspondence between the first user equipment and the first network element. The communication method according to any one of claims 1 to 3, wherein the method further comprises: The aggregation network element receives a second call request message sent by the second network element of the IMS network, where the second call request message is used to call the third user equipment of the fourth user equipment in the second communication network. The second communication network is registered to the IMS network by the aggregation network element, the second communication network communicates with the IMS network by using the aggregation network element, and the second network element is used for the IMS network Registered users provide IMS services; The aggregation network element routes the third call request to the fourth user equipment by using the second communication network. The communication method according to claim 4, wherein the method further comprises: The aggregation network element is configured to configure, by the third user equipment, a calling number that is displayed on the fourth user equipment, where the fourth call request message carries the calling number. A communication method, comprising: The first network element in the Internet Protocol Multimedia Subsystem (IMS) network receives a call request message, where the call request message is used to call the first user equipment of the second user equipment of the first communication network, where the first communication network is Registered user of the IMS network; The first network element sends an aggregation network element query request message to the second network element in the IMS network, where the aggregation network element query request message carries the information of the second user equipment, where the second network element Configuring a correspondence between at least one user equipment and an aggregation network element; The first network element receives the aggregation network element query result message sent by the second network element, where the aggregation network element query request message carries the information of the first aggregation network element, where the first aggregation network element is the first The second network element is based on the at least one corresponding The determined aggregation network element corresponding to the second user equipment. The communication method according to claim 6, wherein the first network element is a service-call session control function S-CSCF, and the second network element is an enhanced domain name server ENS, and the first communication network is Any of the following communication networks: public switched telephone network PSTN, public land mobile network PLMN, next generation network NGN, IMS network, and EPC network. A communication method, comprising: The first network element in the Internet Protocol Multimedia Subsystem (IMS) network receives the aggregate network element query request message sent by the second network element in the IMS network, where the aggregate network element query request message carries information of the user equipment, where the user The communication network to which the device belongs is a registered user of the IMS network, the first network element is configured with a correspondence between multiple user equipments and an aggregation network element, and the second network element is used to provide an IMS for the user equipment. service; Determining, by the first network element, the first aggregation network element according to the correspondence relationship and the information about the user equipment, where the first communication network is registered to the IMS network by using the first aggregation network element as the IMS a registered user of the network, and communicates with the IMS network through the first aggregation network element; The first network element sends an aggregation network element query result message to the second network element, where the aggregation network element query result message carries the information of the aggregation network element. The communication method according to claim 8, wherein the first network element is ENS, the second network element is a service-call session control function S-CSCF, and the communication network is any one of the following communication Network: Public Switched Telephone Network PSTN, Public Land Mobile Network PLMN, Next Generation Network NGN, IMS Network, and EPC Network. An aggregation network element, comprising: a receiving module, configured to receive a first call request message sent by the first user equipment in the first communications network, where the first call request message is used to call the second user equipment for the first user equipment, where the first The communication network is registered by the aggregation network element to the Internet Protocol Multimedia Subsystem (IMS) network as a registered user of the IMS network, and communicates with the IMS through the aggregation network element; a sending module, configured to route the first call request message to the second user equipment by using a first network element in the IMS network, where the first network element is used for a registered user of the IMS network Provide IMS services. The aggregation network element according to claim 10, wherein the aggregation network element further comprises a registration module, configured to register the first communication network to the IMS network. The aggregation network element according to claim 11, wherein the registration module is specifically configured to: And when a link state between the first communication network and the aggregation network element is changed from a failure to a normal state, a registration process is initiated to the home subscription user server HSS in the IMS network; Receiving a registration response message sent by the HSS, where the registration response message carries information of the first network element; Recording a correspondence between the first user equipment and the first network element, The aggregation network element further includes a determining module, configured to determine the first network element according to the corresponding relationship between the first user equipment and the first network element. The aggregation network element according to any one of claims 10 to 12, wherein the receiving module is further configured to receive a second call request message sent by the second network element of the IMS network, the second The call request message is used to call a third user equipment in the second communication network, where the second communication network is registered to the IMS network by using the aggregation network element, and the second communication network passes the The aggregation network element is in communication with the IMS network, and the second network element is configured to provide an IMS service for a registered user of the IMS network; The sending module is further configured to route the third call request to the fourth user set by using the second communication network Ready. The aggregation network element according to claim 13, wherein the method further comprises: a configuration module, configured to configure, for the third user equipment, a calling number for display on the fourth user equipment, where The calling number is carried in the fourth call request message. A network element in an IMS network of an Internet Protocol Multimedia Subsystem, comprising: a receiving module, configured to receive a call request message, where the call request message is used to call a first user equipment of a first user equipment, where the first communication network is a registered user of the IMS network; a sending module, configured to send an aggregation network element query request message to the second network element in the IMS network, where the aggregation network element query request message carries the information of the second user equipment, where the second network element is configured Corresponding relationship between at least one user equipment and the aggregation network element; The receiving module is further configured to receive, by the second network element, an aggregation network element query result message, where the aggregation network element query request message carries information of the first aggregation network element, where the first aggregation network element is The aggregation network element corresponding to the second user equipment determined by the second network element according to the at least one corresponding relationship. The network element according to claim 15, wherein the first network element is a service-call session control function S-CSCF, and the second network element is an enhanced domain name server ENS, and the first communication network is Any of the following communication networks: public switched telephone network PSTN, public land mobile network PLMN, next generation network NGN, IMS network, and EPC network. A network element in an IMS network of an Internet Protocol Multimedia Subsystem, comprising: a receiving module, configured to receive an aggregation network element query request message sent by a second network element in the IMS network, where the aggregation network element query request message carries information of the user equipment, where the communication network to which the user equipment belongs is a registered user of the IMS network, where the first network element is configured with a corresponding relationship between a plurality of user equipments and an aggregation network element, and the second network element is configured to provide an IMS service for the user equipment; a determining module, configured to determine, according to the correspondence relationship and information about the user equipment, a first aggregation network element, where the first communication network is registered to the IMS network by using the first aggregation network element as the IMS network Registered user, and communicates with the IMS network through the first aggregation network element; The sending module is configured to send an aggregation network element query result message to the second network element, where the aggregation network element query result message carries the information of the aggregation network element. The network element according to claim 17, wherein the first network element is ENS, the second network element is a service-call session control function S-CSCF, and the communication network is any one of the following communication Network: Public Switched Telephone Network PSTN, Public Land Mobile Network PLMN, Next Generation Network NGN, IMS Network, and EPC Network. An Internet Protocol Multimedia Subsystem IMS, characterized by comprising the aggregation network element according to any one of claims 10 to 14 or the network element according to any one of claims 15 to 18.

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