CN110505355B - Method and system for establishing three-party call - Google Patents

Method and system for establishing three-party call Download PDF

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Publication number
CN110505355B
CN110505355B CN201910789901.6A CN201910789901A CN110505355B CN 110505355 B CN110505355 B CN 110505355B CN 201910789901 A CN201910789901 A CN 201910789901A CN 110505355 B CN110505355 B CN 110505355B
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user terminal
call
party call
request
party
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CN110505355A (en
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张伦泳
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H04L65/403—Arrangements for multi-party communication, e.g. for conferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • 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

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Engineering & Computer Science (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The invention discloses a method and a system for establishing a three-party call. The method comprises the following steps: receiving a suspension request for suspending a current call from a first user terminal; suspending the current call of the first user terminal and the second user terminal established based on a mobile communication network according to the suspension request; receiving a connection request initiated by a communication server corresponding to a third user terminal; establishing a three-party call instruction according to the connection request so that a user plane functional entity establishes a three-party call with a one-to-many forwarding relation according to the three-party call instruction and enables the third user terminal to join the three-party call; the one-to-many forwarding relation is used for forwarding the call of one terminal to terminals except for the terminal. The method can realize that a third user terminal based on a data network is added on the basis of video or voice communication based on a mobile communication network, thereby realizing three-party communication of different networks.

Description

Method and system for establishing three-party call
Technical Field
The invention relates to the technical field of communication, in particular to a method and a system for establishing three-party call based on different network types.
Background
The mobile terminal can not only use the mobile communication network to carry out conversation and data transmission, but also can carry out conversation and data transmission through the data network. Because the mobile communication network and the data network belong to two independent network types, when a user establishes a call based on the mobile communication network, a third party based on the data network cannot join the call, namely, a three-party call cannot be established among three terminals of different network types.
Disclosure of Invention
Therefore, the invention provides a method and a system for establishing three-way calls with different network types, which aim to solve the problem that the three-way call cannot be established due to the mutual independence of different network types in the prior art.
In order to achieve the above object, a first aspect of the present invention provides a method for establishing a three-way call, which is applied to a session management function entity, and the method includes:
receiving a suspension request for suspending a current call from a first user terminal; the suspension request is a suspension request sent by a called application program of the first user terminal based on a calling request initiated by the calling application program, and the calling request comprises a three-party call identifier;
suspending the current call of the first user terminal and the second user terminal established based on a mobile communication network according to the suspension request;
receiving a connection request initiated by a third user terminal; the connection request comprises a three-party call identifier, original call basic information and pre-established call basic information; the third user terminal is connected with the first user terminal based on a data network;
establishing a three-party call instruction according to the connection request so that a user plane functional entity establishes a three-party call with a one-to-many forwarding relation according to the three-party call instruction and enables the third user terminal to join the three-party call; the one-to-many forwarding relation is used for forwarding the call of one terminal to terminals except for the terminal.
Wherein, setting up a three-party call instruction according to the connection request, so that a user plane functional entity establishes a three-party call with a one-to-many forwarding relationship according to the three-party call instruction, and enables the third user terminal to join the three-party call, comprises:
establishing a three-party call instruction according to the connection request so that the user plane functional entity establishes a one-to-many forwarding relation three-party call according to the three-party call instruction;
receiving a feedback message of the completion of the three-party call establishment from the user plane functional entity;
forwarding the feedback message of the completion of the three-party call establishment to the third user terminal so that the third user terminal joins the three-party call;
receiving an instruction from the first user terminal to recover the suspended call so as to recover the suspended call of the first user terminal and the second user terminal.
Receiving an instruction from the first user terminal to resume the suspended call, so as to resume the suspended call between the first user terminal and the second user terminal, including:
receiving an instruction of the first user terminal for recovering the suspended call;
and resuming the suspended call and sending a confirmation resuming message to the first user terminal and the second user terminal.
Preferably, after the three-party call is established, the called program in the first user terminal is switched to the background.
In order to achieve the above object, a second aspect of the present invention provides a method for establishing a three-way call, which is applied to a user plane management entity, and the method includes:
receiving a suspension instruction established by a session management functional entity according to a suspension request initiated by a first user terminal for suspending a current call; the suspension request is a suspension request sent by a called application program of the first user terminal based on a calling request initiated by the calling application program, and the calling request comprises a three-party call identifier;
suspending the current conversation of the first user terminal and the second user terminal established based on a mobile communication network according to the suspension instruction;
receiving a three-party call establishing instruction sent by the session management functional entity according to a connection request of a third user terminal;
establishing a three-party call with a one-to-many forwarding relation according to the three-party call instruction, and enabling the third user terminal to join the three-party call; the one-to-many forwarding relation is used for forwarding the call of one terminal to terminals except for the terminal.
Preferably, after the three-party call with the one-to-many forwarding relationship established according to the three-party call instruction, the method further includes:
and sending a feedback result of successful establishment of the three-party call to the session management functional entity so as to enable the third user terminal to join the three-party call.
In order to achieve the above object, a third aspect of the present invention provides a method for establishing a three-way call, which is applied to a communication server of a third user terminal that is requested to join the three-way call, the method including:
receiving a call request from a first user terminal, wherein the call request is a request for suspending a current call sent by the first user terminal, and the request for joining the three-party call is sent to a third user terminal after the current calls of the first user terminal and a second user terminal are suspended, the request for suspending is a request for suspending a called application program of the first user terminal based on a calling request sent by the calling application program, and the calling request and the call request contain a three-party call identifier;
sending the call request to a third user terminal, and establishing pre-connection with the third user terminal;
sending a connection request to a session management function entity corresponding to the first user terminal so that a user plane function entity establishes a three-party call with a one-to-many forwarding relationship according to a three-party call instruction, wherein the connection request comprises a three-party call identifier, original call basic information and pre-established call basic information; the third user terminal is connected with the first user terminal based on a data network, and the one-to-many forwarding relation is that the call of one terminal is forwarded to terminals except the third user terminal;
receiving a confirmation message of the completion of the three-party call establishment sent by a session management function entity corresponding to the first user terminal;
sending a confirmation message of the completion of the establishment of the three-party call to the first user terminal and the third user terminal;
and forwarding the instruction of joining the third user terminal into the three-party call, and sending the instruction of joining the third user terminal into the three-party call to the session management function entity corresponding to the first user terminal.
Preferably, after the sending the instruction for joining the third user terminal to a three-party call to the session management function entity corresponding to the first user terminal, the method further includes:
and sending the suspended call to a session management function entity corresponding to the first user terminal so as to recover the suspended call between the first user terminal and the second user terminal.
Preferably, after the call of the first user terminal and the second user terminal which are suspended is resumed, the method further comprises:
and sending a program switching instruction to the first user terminal so as to switch the called program in the first user terminal to a background.
In order to achieve the above object, a fourth aspect of the present invention provides a system for establishing a three-way call, including a session management entity, a user plane functional entity in a first network, and a communication server in a second network, where a first user terminal and a second user terminal establish a current call in the first network through the session management entity and the user plane functional entity, and a third user terminal is in the second network, where types of the first network and the second network are different; the session management entity executes a corresponding method; a method executed by the user plane functional entity; and the communication server performs a corresponding method.
The invention has the following advantages:
the method for three-party call provided by the invention is characterized in that after a hanging request for hanging up the current call initiated by a first user terminal is received, the current calls of the first user terminal and a second user terminal established based on a mobile communication network are hung up, then a three-party call with one-to-many forwarding relation is established according to a connection request initiated by a third user terminal, and the third user terminal is added into the three-party call, so that the third user terminal based on a data network can be added on the basis of video or voice communication based on the mobile communication network, and the three-party call of different networks is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of a session management function entity in a method for establishing a three-party call according to an embodiment of the present invention;
fig. 2 is a flowchart of a functional entity for a user plane in the method for establishing a three-way call according to the embodiment of the present invention;
fig. 3 is a flowchart of a communication server for a third user terminal in the method for establishing a three-way call according to the embodiment of the present invention;
fig. 4 is a flowchart of a method for establishing a three-way call according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The method for establishing a three-party call provided by this embodiment is a three-party call established between two different networks, for example, a first user terminal and a second user terminal establish a two-party call based on a mobile communication network, the first user terminal wants to add a third user terminal to the call to form the three-party call, and the third user terminal is a data network-based user, that is, the third user terminal based on the data network adds to the call established based on the mobile communication network, thereby forming the three-party call between the different networks.
It should be noted that, although the three-party call establishment procedure between different networks is described by taking the first user terminal, the second user terminal, and the third user terminal as an example in the present embodiment, this does not mean that the three-party call is limited to three terminals. In fact, the joining of the fourth terminal, the fifth terminal or more to the established three-way call is referred to as a three-way call. In other words, three parties means more than three.
In the embodiment, the first user terminal and the second user terminal establish a double-party call based on the 5G mobile communication network. It is understood that the call between the first User terminal and the second User terminal is controlled and managed by a Session Management Function (SMF) and a User Plane Management Function (UPF), and communicates with the third User terminal through a Network open Function (NEF). The third user terminal is connected with the first user terminal through a data network (such as wifi).
In one embodiment, the first user terminal and the second user terminal establish an audio-video call using a telephone program. The first user terminal adds a third user terminal into the audio and video call through chat tools such as WeChat or QQ and the like, so that a three-party call is established. In particular, the amount of the solvent to be used,
as shown in fig. 1, the method for establishing a three-way call provided in this embodiment includes the following steps:
step S101, receiving a suspension request for suspending the current call from the first user terminal.
In step S101, the suspend request is a request issued by the called application of the first user terminal based on a call request initiated thereto by the calling application. For example, when a phone program of a first user terminal performs a phone call with a second user terminal, the first user terminal wants a third user terminal to join the call to establish a three-way call, the phone program in the first user terminal calls an application program (such as WeChat, QQ, etc.), the phone program is the calling application program, and the application program such as WeChat is the called program. An application program in the first user terminal is called by a telephone program, such as selecting a friend through a WeChat friend list, and then a video call request is initiated. And the calling request initiated by the application program contains a three-party call identifier, namely, the calling request is represented as a three-party call to the third user terminal.
Specifically, when the application program in the first user terminal detects that its state is a state called by another program and the program calling itself is a telephone program in the first user terminal, a request for "suspending the current call" is sent to the telephone program. And simultaneously, the first user terminal automatically jumps to a call interface of the application program.
Step S102, according to the suspension request, suspending the current conversation of the first user terminal and the second user terminal established based on the mobile communication network.
In one embodiment, when the first user terminal receives an instruction to suspend the current call, it interacts with a Session Management Function (SMF) and the second user terminal to suspend the current call.
Step S103, receiving a connection request initiated by a communication server corresponding to the third user terminal.
It should be noted that the connection request includes the three-party call identifier, the original call basic information, and the pre-established call basic information. Furthermore, the connection request is issued based on a call request of an application in the first user terminal. After receiving a call request initiated by an application program of the first user terminal, the communication server establishes a pre-connection with the third user terminal, that is, the communication server establishes a communication connection with the third user terminal in the background, but the third user terminal does not notify the third user, that is, the third user does not know that the first user wants to establish a call with the third user terminal.
Specifically, after the current call between the first user terminal and the second user terminal is suspended, the phone program of the first user terminal sends the session ID of the suspended current call to the application program, the phone number capable of identifying the identities of the first user terminal and the second user terminal, and media stream parameters currently adopted by the first user terminal and the second user terminal, such as parameters of a video encoding format, an audio compression format, and the like.
An application program in the first user terminal sends a call request to a third user terminal, wherein the call request comprises a session ID of a suspended current call, a telephone number capable of identifying the identities of the first user terminal and the second user terminal, a media stream parameter currently adopted by the first user terminal and the second user terminal, and a mark of a three-party call request to be established across a network system.
And after receiving the connection request for establishing the three-party call, the communication server corresponding to the third user terminal interacts with the corresponding communication server to complete the pre-establishment of the call connection. The adaptation of media stream parameters is included in the pre-connection.
After the pre-connection is established, a communication server corresponding to a third user terminal initiates a connection request to the first user terminal, wherein the connection request comprises a mark of three-party call, a session ID of the suspended current call, telephone numbers of the first user terminal and the second user terminal, and a quintuple adopted by an application program in the pre-established first user terminal and a media stream corresponding to audio and video call of the application program in the second user terminal, namely a source IP address, a destination IP address, a source port number, a destination port number and a transport layer protocol type.
And step S104, setting up a three-party call instruction according to the connection request.
In step S104, after receiving the connection request, the user plane functional entity establishes a three-party call with a one-to-many forwarding relationship according to the three-party call instruction, and enables a third user terminal to join the three-party call. The one-to-many forwarding relation is that the call of one terminal is forwarded to other terminals.
It should be noted that the one-to-many forwarding relationship refers to the audio and video sent by the first user terminal corresponding to the suspended current call to the second user terminal, and is forwarded to the application program in the third user terminal. And the audio and video which is sent to the first user terminal by the second user terminal corresponding to the suspended current call is simultaneously forwarded to an application program in the third user terminal. And the audio and video sent by the application program in the third user terminal are simultaneously forwarded to the first user terminal and the second user terminal.
Step S104 specifically includes: establishing a three-party call instruction according to the connection request so that the user plane functional entity establishes a one-to-many forwarding relation three-party call according to the three-party call instruction; receiving a feedback message of the completion of the three-party call establishment from the user plane functional entity; forwarding the feedback message of the completion of the three-party call establishment to a third user terminal so that the third user terminal joins the three-party call; and receiving an instruction from the first user terminal to recover the suspended call so as to recover the call of the suspended first user terminal and the suspended second user terminal.
In one embodiment, after receiving an instruction from the first user equipment to resume the suspended call, the method further includes: receiving an instruction of a first user terminal for recovering the suspended call; and resuming the suspended call and sending a confirmation resuming message to the first user terminal and the second user terminal, thereby resuming the suspended call of the first user terminal and the second user terminal.
In another embodiment, the called program in the first user terminal is switched to the background after the three-party call is established. Moreover, the switching of the called program can be automatically switched after the three-party call is established, and can also be switched according to a switching instruction of a user.
As shown in fig. 2, in another embodiment, a method for establishing a three-way call is applied to a user plane management entity, and the specific method includes:
step S201, receiving a suspension instruction which is established by a session management functional entity according to a suspension request for suspending the current call initiated by a first user terminal;
the suspension request is issued by a called application program of the first user terminal based on a call request initiated by the calling application program, and the call request comprises a three-party call identifier.
Step S202, suspending the current conversation of the first user terminal and the second user terminal established based on the mobile communication network according to a suspension instruction;
step S203, receiving a three-party call setting instruction sent by the session management function entity according to the connection request of the communication server corresponding to the third user terminal;
it should be noted that steps S201 to S203 are the same as steps S101 to S103, and are not described again here.
Step S204, establishing a three-party call with one-to-many forwarding relation according to the three-party call instruction.
Step S205, sending a feedback result of successful establishment of the three-party call to the session management functional entity, and enabling a third user terminal to join the three-party call; the one-to-many forwarding relation is that a call of one terminal is forwarded to terminals except for the terminal.
As shown in fig. 3, in another embodiment, a method for establishing a three-way call is further provided, which is applied to a communication server of a third user terminal that is requested to join the three-way call, and specifically includes:
step S301, receiving a call request from a first user terminal.
The call request is a request for joining the three-party call, which is sent to a third user terminal after the first user terminal sends a suspension request for suspending the current call and the current calls of the first user terminal and the second user terminal are suspended, the suspension request is a suspension request sent by a called application program of the first user terminal based on a calling request sent by the calling application program, and the calling request and the call request contain three-party call identifiers.
Step S302, sending the call request to a third user terminal, and establishing call pre-connection with the third user terminal.
Step S303, sending a connection request to a session management function entity corresponding to the first user terminal, so that the user plane function entity establishes a three-way call with a one-to-many forwarding relationship according to the three-way call instruction.
The connection request comprises a three-party call identifier, original call basic information and pre-established call basic information; the third user terminal and the first user terminal are connected based on a data network, and the one-to-many forwarding relation is that the call of one terminal is forwarded to the terminals except the third user terminal.
Step S304, receiving a confirmation message of the completion of the three-party call setup sent by the session management functional entity corresponding to the first user terminal.
Step S305, sending a confirmation message of the completion of the three-party call establishment to the first user terminal and the third user terminal.
And step S306, forwarding an instruction of the third user terminal for joining the three-party call, and sending the instruction of the third user terminal for joining the three-party call to the session management function entity corresponding to the first user terminal.
Step S307, sending the suspended call to the session management function entity corresponding to the first user terminal, so as to resume the call between the suspended first user terminal and the suspended second user terminal.
Step S308, a program switching instruction is sent to the first user terminal, so that the called program in the first user terminal is switched to the background.
The method for three-party call provided by the invention can be used for hanging the current call of the first user terminal and the second user terminal established based on the mobile communication network after receiving the hanging request for hanging the current call initiated by the first user terminal, establishing the three-party call with one-to-many forwarding relation according to the connection request initiated by the third user terminal, and enabling the third user terminal to join the three-party call, so that the third user terminal based on the data network can be joined on the basis of video or voice communication based on the mobile communication network, and the three-party call of different networks can be realized.
In yet another embodiment, a system for establishing a three-way call is provided, which includes a session management entity in a first network, a user plane function entity, and a communication server in a second network, wherein a first user terminal and a second user terminal establish a current call in the first network through the session management entity and the user plane function entity, a third user terminal is in the second network, and the types of the first network and the second network are different; the session management entity executes the methods provided in steps S101 to S104; the user plane functional entity executes the methods provided in the steps S201 to S205; and the communication server performs the methods provided in steps S301 to S308.
The following describes the three-party call establishment process in detail with respect to the three-party call establishment system. As shown in fig. 4, the process of establishing the three-way call specifically includes:
in step S401, the phone program in the first user terminal sends a call request to the application program.
Before the telephone program of the first user terminal sends a call request to the application program, the telephone program of the first user terminal and the telephone program of the second user terminal already establish audio-video calls through the mobile communication network, and the telephone program of the first user terminal hopes to add a third user to the call in the call process. Therefore, the phone program of the first user terminal calls the application program and initiates an audio-video call to the application program of the third user terminal within the application program. If the third user terminal is added into the audio and video call from the WeChat program, a three-party call is formed.
In step S402, the application program of the first user terminal sends a suspend request for suspending the current call to the phone program of the first user terminal.
In step S402, when the application program of the first user terminal detects that the current state belongs to a state called by another program and the calling program is a phone program in the first bluetooth terminal, a suspend request for suspending the current call is sent to the phone program of the first user terminal. The current call refers to a call that has been established by the first user terminal and the second user terminal.
In one embodiment, the first user terminal automatically switches to a call interface of an application of the first user terminal while the application issues a suspend request to suspend the current call. For example, the WeChat program of the first user terminal is in the background and the telephony program is in the foreground before the WeChat program initiates the suspend current call request. When the WeChat program sends a request for suspending the current call to the telephone program, the WeChat program of the first user terminal is automatically switched to the foreground, and the telephone program is automatically switched to the background.
In step S403, the current call of the first user terminal and the second user terminal is suspended.
Specifically, after receiving the suspend request, the phone program of the first user terminal interacts with the SMF and the second user terminal to complete the suspend operation of the current call.
In step S404, the phone program of the first user terminal sends the current session basic information to the application program.
It should be noted that the current session basic information includes a session ID of a suspended current call, a phone number capable of identifying identities of the first user terminal and the second user terminal, and media stream parameters currently adopted by the first user terminal and the second user terminal, such as parameters of a video encoding format, an audio compression format, and the like.
In step S405, the application program of the first user terminal initiates a call request to the communication server of the third user terminal.
The communication server of the third user terminal is a communication server connecting the first user terminal and the third user terminal. The first user terminal and the third user terminal realize signal transmission through the server. For example, the wechat program of the first user terminal and the wechat program of the third user terminal realize communication through the communication server.
The call request includes not only a session ID of a current call to be suspended, a phone number capable of identifying identities of the first user terminal and the second user terminal, and a media stream parameter currently adopted by the first user terminal and the second user terminal, but also a flag of a three-party call request to be established across a network system.
Step S406, the communication server receives the pre-connection setup with the third user terminal.
Specifically, after receiving a call request initiated by an application program of the first user terminal, the communication server interacts with an application program of a third user terminal and completes call pre-connection. The receiving of the pre-connection established with the third user terminal at the communication server comprises an adaptation of media stream parameters employed by the first user terminal and the second user terminal.
It should be noted that the pre-connection means that the communication server and the third user terminal establish a communication connection in the background, but the third user terminal does not notify the third user, that is, the third user does not know that the first user wants to establish a call with the third user terminal.
Step S407, the communication server receives the connection request sent to the network open function entity.
The connection request comprises a three-party call mark, a hung session ID of a current call, telephone numbers of a first user terminal and a second user terminal, and basic information of a pre-established call, namely a quintuple used by an application program in the first user terminal and a media stream corresponding to an audio/video call of an application program in the second user terminal, namely a source IP address, a destination IP address, a source port number, a destination port number and a transport layer protocol type.
A Network Exposure Function (NEF) is an entity of a mobile communication Network, and is mainly used for isolating the mobile communication Network from other networks due to the Function of a firewall.
In step S408, the NEF sends a connection request to the SMF to send the SMF the flag of the three-party call, the session ID of the current call being suspended, the telephone numbers of the first and second user terminals, and the basic information of the pre-established call.
Step S409, the SMF sets a three-party call instruction according to the connection request of the communication server so as to control the UPF to establish the three-party call. The three-party call refers to a call among a first user terminal, a second user terminal and a third user terminal.
In step S410, the SMF sends the three-way call instruction to the UPF, so that the UPF establishes the three-way call.
In step S411, the UPF establishes a three-way call. Specifically, the UPF establishes a three-party call with a one-to-many forwarding relationship according to the three-party call instruction, and enables a third user terminal to join the three-party call. The one-to-many forwarding relation is that the call of one terminal is forwarded to other terminals.
Specifically, the audio/video sent by the first user terminal to the second user terminal is forwarded to the application program in the third user terminal. And the audio and video sent by the second user terminal to the first user terminal are simultaneously forwarded to an application program in a third user terminal. And the audio and video sent by the application program in the third user terminal are simultaneously forwarded to the first user terminal and the second user terminal.
In step S412, the UPF sends a feedback result to the SMF, that is, the UPF sends a confirmation message of completion of the three-party call establishment to the SMF.
In step S413, the SMF forwards the information of the three-way call setup completion to the NEF.
In step S414, the NEF forwards the information of the completion of the three-way call establishment to the communication server.
It is understood that the messages of the three-way call setup completion are sent to the communication server in steps S412 to S414.
In step S415, the communication server sends a message that the three-way call is established to the application program of the first user terminal.
In step 416, the communication server sends a reminder notification to the third user terminal, such as by ringing the third user terminal to notify that a three-way call has been established.
It should be noted that step S415 and step S416 may be performed simultaneously, or step S415 is performed first, and then step S416 is performed; alternatively, step S416 is executed first, and then step S415 is executed. Namely, the communication server can firstly send a message that the three-party call is established to the application program of the first user terminal, and then send a reminding notice to the third user terminal; or the communication server firstly sends a reminding notice to the third user terminal and then sends a message that the three-party call is established to the application program of the first user terminal; or, the communication server sends a message that the three-way call is established to the application program of the first user terminal, and simultaneously sends a reminding notification to the third user terminal, and the several ways can achieve the purpose of the present invention and all belong to the protection scope of the present invention.
In step S417, the application program of the first user terminal sends the call to the SMF to resume the suspended call. Specifically, the application program of the first user terminal sends a request for resuming the suspended call to the telephone program, the telephone program forwards the request for resuming the suspended call to the SMF, and the SMF interacts with the telephone program of the first user terminal and the telephone program of the second user terminal to resume the suspended call.
Step S418, after the application program of the third user terminal receives the notification of the communication server, the off-hook is completed, that is, the invitation of the three-party call is accepted. And if the third user does not perform off-hook operation, the third user terminal does not accept the invitation of the three-party call.
In step S419, the communication server sends the SMF an off-hook operation of the third user terminal, specifically, the communication server sends the NEF an off-hook operation of the third user terminal, and the NEF forwards the off-hook operation to the SMF.
Step S420, sending the message that the third user terminal joins the three-party call to the phone program of the first user terminal.
Specifically, after receiving the off-hook operation of the third user terminal, the SMF sends a message that the third user terminal joins in the three-party call to the phone program of the first user terminal, thereby completing the entire process of the three-party call, and the application program in the first user terminal, the application program in the third user terminal, and the phone program of the second user terminal implement the three-party call through one-to-many forwarding of the UPF.
In one embodiment, after step S420, the method further includes:
step S421, the communication server sends a program switching instruction to the first user terminal, and switches the called program (wechat program) in the first user terminal to the background.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (10)

1. A method for establishing a three-party call is applied to a session management function entity, and is characterized in that the method comprises the following steps:
receiving a suspension request for suspending a current call from a first user terminal; the suspension request is a suspension request sent by a called application program of the first user terminal based on a calling request initiated by the calling application program, and the calling request comprises a three-party call identifier;
suspending the current call of the first user terminal and the second user terminal established based on a mobile communication network according to the suspension request;
receiving a connection request initiated by a communication server corresponding to a third user terminal; the connection request is sent by the communication server after establishing pre-connection with a third user terminal, and the connection request comprises a three-party call identifier, original call basic information and pre-established call basic information; the third user terminal is connected with the first user terminal based on a data network;
establishing a three-party call instruction according to the connection request so that a user plane functional entity establishes a three-party call with a one-to-many forwarding relation according to the three-party call instruction and enables the third user terminal to join the three-party call; the one-to-many forwarding relation is used for forwarding the call of one terminal to terminals except for the terminal.
2. The method according to claim 1, wherein setting up a three-party call instruction according to the connection request, so that the user plane function entity establishes a three-party call in a one-to-many forwarding relationship according to the three-party call instruction, and joins the third user terminal to the three-party call, comprises:
establishing a three-party call instruction according to the connection request so that the user plane functional entity establishes a one-to-many forwarding relation three-party call according to the three-party call instruction;
receiving a feedback message of the completion of the three-party call establishment from the user plane functional entity;
forwarding the feedback message of the completion of the three-party call establishment to the third user terminal so that the third user terminal joins the three-party call;
receiving an instruction from the first user terminal to recover the suspended call so as to recover the suspended call of the first user terminal and the second user terminal.
3. The method of claim 2, wherein receiving an instruction from the first user terminal to resume the suspended call between the first user terminal and the second user terminal comprises:
receiving an instruction of the first user terminal for recovering the suspended call;
and resuming the suspended call and sending a confirmation resuming message to the first user terminal and the second user terminal.
4. The method of claim 2, wherein the invoked program in the first user terminal is switched to the background after the three-way call is established.
5. A method for establishing three-party call is applied to a user plane management entity, and is characterized in that the method comprises the following steps:
receiving a suspension instruction established by a session management functional entity according to a suspension request initiated by a first user terminal for suspending a current call; the suspension request is a suspension request sent by a called application program of the first user terminal based on a calling request initiated by the calling application program, and the calling request comprises a three-party call identifier;
suspending the current conversation of the first user terminal and the second user terminal established based on a mobile communication network according to the suspension instruction;
receiving a three-party call establishing instruction sent by the session management functional entity according to a connection request initiated by a communication server corresponding to a third user terminal, wherein the connection request is sent by the communication server after establishing pre-connection with the third user terminal, and the connection request comprises a three-party call identifier, original call basic information and pre-established call basic information; the third user terminal is connected with the first user terminal based on a data network;
establishing a three-party call with a one-to-many forwarding relation according to the three-party call instruction, and enabling the third user terminal to join the three-party call; the one-to-many forwarding relation is used for forwarding the call of one terminal to terminals except for the terminal.
6. The method of claim 5, wherein after the three-party call establishing the one-to-many forwarding relationship according to the three-party call instruction, further comprising:
and sending a feedback result of successful establishment of the three-party call to the session management functional entity so as to enable the third user terminal to join the three-party call.
7. A method for establishing a three-way call, which is applied to a communication server of a third user terminal requested to join the three-way call, is characterized by comprising the following steps:
receiving a call request from a first user terminal, wherein the call request is a request for suspending a current call sent by the first user terminal, and the request for joining the three-party call is sent to a third user terminal after the current calls of the first user terminal and a second user terminal are suspended, the request for suspending is a request for suspending a called application program of the first user terminal based on a calling request sent by the calling application program, and the calling request and the call request contain a three-party call identifier;
sending the call request to a third user terminal, and establishing pre-connection with the third user terminal;
sending a connection request to a session management function entity corresponding to the first user terminal so that a user plane function entity establishes a three-party call with a one-to-many forwarding relationship according to a three-party call instruction, wherein the connection request comprises a three-party call identifier, original call basic information and pre-established call basic information; the third user terminal is connected with the first user terminal based on a data network, and the one-to-many forwarding relation is that the call of one terminal is forwarded to terminals except the third user terminal;
receiving a confirmation message of the completion of the three-party call establishment sent by a session management function entity corresponding to the first user terminal;
and sending a session management function entity corresponding to the first user terminal to the third user terminal by the instruction of joining the three-party call.
8. The method according to claim 7, wherein after the sending the session management function entity corresponding to the first user terminal to the third user terminal, the method further comprises:
and sending the suspended call to a session management function entity corresponding to the first user terminal so as to recover the suspended call between the first user terminal and the second user terminal.
9. The method of claim 7, further comprising, after the call between the first user terminal and the second user terminal that is suspended is resumed:
and sending a program switching instruction to the first user terminal so as to switch the called program in the first user terminal to a background.
10. A system for establishing three-party call comprises a session management entity, a user plane functional entity and a communication server in a second network, wherein a first user terminal and a second user terminal establish current call in the first network through the session management entity and the user plane functional entity, a third user terminal is in the second network, and the types of the first network and the second network are different; it is characterized in that the preparation method is characterized in that,
the session management entity performing the method of any of claims 1 to 4;
the user plane functional entity performing the method of any of claims 5 to 6;
and the communication server performs the method of any one of claims 7 to 9.
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