CN105873241B - Method and device for establishing call connection - Google Patents

Abstract

The present disclosure relates to a method and device for establishing a call connection, and relates to the field of communication technologies. In the process of establishing a call connection in the present disclosure, when a call establishment failure message is received, a redirect call request is sent to a designated device, where the designated device is a device used to establish a call connection in a circuit-switched CS domain, and the designated device sends channel resource information, the channel resource information is established by the designated device for the terminal when it receives the redirect call request, and the channel resource information is sent to the terminal, and the channel resource information is used to establish a call with the terminal. connection, that is, in the process of establishing a call connection by the terminal, when the establishment of the call connection through the PS domain fails, the management device in the PS domain sends a redirect call request to the designated device in the CS domain, so that the designated device is The terminal establishes a channel resource, so that the terminal can establish a call connection through the channel resource, thereby reducing the call establishment delay.

Description

Method and device for establishing a call connection

technical field

The present disclosure relates to the field of communication technologies, and in particular, to a method and apparatus for establishing a call connection.

Background technique

At present, in a mobile communication network, a terminal can establish a call connection through two switching modes. The two switching modes include: a circuit switching mode and a packet switching mode. ) domain to establish a call connection, in this implementation, the CS domain needs to allocate exclusive channel resources for each terminal, so that the terminal can establish a call connection through the channel resources; In this implementation, different terminals can share the same channel resource, that is, in the same channel resource, different terminals can realize the establishment of the call connection by transmitting data packets in groups .

In the actual application process, in order to save channel resources, the terminal generally first chooses to establish a call connection through the PS domain, that is, the terminal uses the PS domain to communicate with the IMS (IP Multimedia) used to implement the voice service in the IP (Internet Protocol, network protocol) network. Subsystem, IP Multimedia Subsystem) sends a call connection establishment request, when the establishment of the call connection fails due to factors such as cell capacity or usage density, the IMS returns a connection establishment failure message to the terminal through the PS domain, and the terminal receives the establishment connection failure message After the connection failure message, the call connection is established through the CS domain, that is, the terminal sends a call connection establishment request to the device responsible for establishing the call connection in the CS domain, so that the device responsible for establishing the call connection establishes channel resources for the terminal, so that the The terminal establishes a call connection through the established channel resources.

SUMMARY OF THE INVENTION

In order to overcome the problems existing in the related art, the present disclosure provides a method and apparatus for establishing a call connection.

In a first aspect, a method for establishing a call connection is provided, the method comprising:

In the process of establishing a call connection, when a call establishment failure message is received, a call redirection request is sent to a designated device, where the call redirection request at least carries terminal information, and the designated device is a circuit-switched CS domain used for A device for establishing a call connection, the terminal information is information of a terminal requesting to establish a call connection;

receiving channel resource information sent by the designated device, where the channel resource information is established by the designated device for the terminal when receiving the redirect call request;

Sending the channel resource information to the terminal, where the channel resource information is used to establish a call connection with the terminal.

With reference to the first aspect, in a first possible implementation manner of the foregoing first aspect, the sending the channel resource information to the terminal includes:

generating a signaling link release message based on the channel resource information;

The generated signaling link release message is sent to the terminal.

With reference to the first aspect, in a second possible implementation manner of the above-mentioned first aspect, the process of establishing a call connection includes:

receiving a call establishment request message, where the call establishment request message carries the terminal information, and the call establishment request message is used to instruct a terminal corresponding to the terminal information to establish a call connection;

forwarding the call establishment request message to the IP multimedia subsystem IMS, where the IMS is at least used to establish a call connection with the terminal;

A call establishment response message sent by the IMS is received, where the call establishment response message includes a call establishment success message or the call establishment failure message.

With reference to the first aspect, in a third possible implementation manner of the above-mentioned first aspect, when receiving a call establishment failure message, the method further includes:

The call establishment failure message is forwarded to the terminal to notify the terminal that the call establishment fails, and the call establishment failure message is used to instruct the terminal to switch to a ready-to-connect state in a circuit-switched mode.

With reference to the first aspect, in a third possible implementation manner of the above-mentioned first aspect, the designated device is a mobile switching center MSC.

In a second aspect, an apparatus for establishing a call connection is provided, the apparatus comprising:

The first sending module is configured to, in the process of establishing a call connection, when receiving a call establishment failure message, send a redirected call request to a designated device, where the redirected call request at least carries terminal information, and the designated device is: A device for establishing a call connection in a circuit-switched CS domain, where the terminal information is information of a terminal requesting to establish a call connection;

a first receiving module, configured to receive channel resource information sent by the designated device, where the channel resource information is established by the designated device for the terminal when it receives the call redirection request;

The second sending module is configured to send the channel resource information to the terminal, where the channel resource information is used to establish a call connection with the terminal.

With reference to the second aspect, in a first possible implementation manner of the above-mentioned second aspect, the second sending module includes:

a generating unit, configured to generate a signaling link release message based on the channel resource information;

A sending unit, configured to send the generated signaling link release message to the terminal.

With reference to the second aspect, in a second possible implementation manner of the above-mentioned second aspect, the apparatus further includes:

a second receiving module, configured to receive a call establishment request message, where the call establishment request message carries the terminal information, and the call establishment request message is used to instruct the terminal corresponding to the terminal information to establish a call connection;

a first forwarding module, configured to forward the call establishment request message to the IP multimedia subsystem IMS, where the IMS is at least used to establish a call connection with the terminal;

A third receiving module is configured to receive a call establishment response message sent by the IMS, where the call establishment response message includes a call establishment success message or a call establishment failure message.

With reference to the second aspect, in a third possible implementation manner of the above-mentioned second aspect, the apparatus further includes:

a second forwarding module, configured to forward the call establishment failure message to the terminal to notify the terminal that the call establishment failed, and the call establishment failure message is used to instruct the terminal to switch to the ready-to-connect state in the circuit-switched mode .

With reference to the second aspect, in a fourth possible implementation manner of the foregoing second aspect, the designated device is a mobile switching center MSC.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: in the process of establishing a call connection by a terminal, when the establishment of a call connection through the PS domain fails, the management device in the PS domain (such as a mobility management entity MME, etc.) The designated device in the domain for establishing a call connection sends a redirect call request, so that the designated device allocates channel resources to the terminal, that is, the designated device returns channel resource information, and the management device sends the channel resource information to the terminal. Make the terminal establish a call connection through the channel resource indicated by the channel resource information, so as to avoid the need for the terminal to send a call connection request to the designated device in the CS domain again after receiving the connection establishment failure message, thereby reducing the call establishment delay. In addition, the redirect call request is directly sent by the management device in the PS domain to the designated device in the CS domain, which can reduce the signaling overhead between the terminal and the network.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1A is a schematic diagram illustrating an implementation environment according to an exemplary embodiment.

FIG. 1B is a flowchart of a method for establishing a call connection according to an exemplary embodiment.

Fig. 2 is a flowchart of a method for establishing a call connection according to another exemplary embodiment.

Fig. 3 is a block diagram of an apparatus for establishing a call connection according to an exemplary embodiment.

Fig. 4 is a block diagram of an apparatus for establishing a call connection according to another exemplary embodiment.

Fig. 5 is a block diagram of an apparatus for establishing a call connection according to another exemplary embodiment.

Fig. 6 is a block diagram of a management device according to an exemplary embodiment.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as recited in the appended claims.

FIG. 1A is a schematic diagram illustrating an implementation environment according to an exemplary embodiment. The implementation environment mainly includes a CS domain 110 , a PS domain 120 , an IMS 130 and a terminal 140 , wherein the CS domain 110 , the PS domain 120 and the IMS 130 They can communicate with each other, and the terminal 140 can establish a call connection through the CS domain 110 , and can also establish a call connection through the PS domain 120 .

The CS domain 110 mainly includes an MSC (Mobile Switching Center, Mobile Switching Center) 110a and a target access network 110b, and the MSC 110a can at least be used to establish a call connection with the terminal 140 in the CS domain, that is, the The MSC 110a can at least be used to establish channel resources for the terminal 140, and the MSC 110a is included in both the GSM (Global System For Mobile Communication, global system for mobile communication) network and the 3G (The Third Generation, third generation) network. Wherein, in different networks, the target access network 110b is different, for example, in GSM, the target access network is GERAN (Global System For Mobile Communication Edge Radio Access Network, GSM edge radio access network), and in GSM In the 3G network, the target access network 110b is a UTRAN (UMTS Terrestrial Radio Access Network, a terrestrial wireless access network of UMTS (Universal Mobile Telecommunications System, Universal Mobile Telecommunications System)), and the target access network 110b is responsible for forwarding the terminal 140 and the MSC. The communication data between 110a, that is, in the actual implementation process, the terminal 140 needs to forward the communication data to the MSC 110a through the target access network 110b. Similarly, the MSC 110a also needs to pass the target access network 110b. The communication data is forwarded to the terminal 140 . It should be noted here that, in the following description, the process of forwarding the communication data by the target access network 110b will not be described in detail, that is, in the following, it will be carried out in a manner similar to the terminal 140 sending the communication data to the MSC 110a directly. describe.

The PS domain 120 mainly includes a management device 120a, an SGSN (Serving GPRS (General Packet Radio Service, General Packet Radio Service) Support Node, a GPRS service support node) 120b, an E-UTRAN (Evolved UTRAN) 120c, and a gateway 120d. Wherein, in an LTE (Long Term Evolution, long term evolution) network, the management device 120a may be an MME (Mobility Management Entity, mobility management entity), and in other networks, the management device 120a may also be other devices, for example, in the In a possible implementation manner, in a 5G (The Fifth Generation, fifth generation) network, the management device 120a may also be a control plane device, and the management device 120a is mainly used to obtain a channel from the MSC 110a in the CS domain. resource information. The SGSN 120b can be used to assign an IP address to the terminal 140, the E-UTRAN 120c can be used to forward the communication data between the terminal 140 and the management device 120a in the PS domain, and the gateway 120d can be used to forward the IMS 130 to the PS domain The communication data between the management devices 120a is the same as the above, and the forwarding process will not be described in detail below.

Wherein, the IMS 130 may be based on the VoLTE (Voice over LTE, LTE-based voice service) technical solution, and cooperate with the LTE network or the 4G (The Forth Generation, fourth generation) core network to implement an end-to-end PS domain-based voice call service, The VoLTE technology is an IP (Internet Protocol, network protocol) data transmission technology, that is, through the VoLTE technology, the terminal 140 can implement a voice call service through an IP network.

The terminal 140 may at least be used to establish a call connection, for example, the terminal 140 may be a call device such as a mobile phone or the like.

FIG. 1B is a flowchart of a method for establishing a call connection according to an exemplary embodiment, and the method for establishing a call connection may include the following steps.

In step 101, in the process of establishing a call connection, when a call establishment failure message is received, a call redirection request is sent to a designated device, where the call redirection request at least carries terminal information, and the designated device is a circuit-switched CS domain The device used to establish a call connection in the , and the terminal information is the information of the terminal requesting to establish a call connection.

In step 102, the channel resource information sent by the designated device is received, where the channel resource information is established for the terminal by the designated device when the redirected call request is received.

In step 103, the channel resource information is sent to the terminal, and the channel resource information is used to establish a call connection with the terminal.

In the embodiment of the present disclosure, in the process of establishing a call connection by the terminal, when the establishment of the call connection through the PS domain fails, the management device in the PS domain (such as the mobility management entity MME, etc.) The designated device sends a redirect call request, so that the designated device allocates channel resources to the terminal, that is, the designated device returns channel resource information, and the management device sends the channel resource information to the terminal, so that the terminal passes the channel resource information. The indicated channel resource establishes a call connection, avoiding the need for the terminal to send a call connection request to the designated device in the CS domain again after receiving the connection establishment failure message, thereby reducing the call establishment delay. In addition, it is directly managed by the PS domain. The device sends the redirect call request to the designated device in the CS domain, which can reduce signaling overhead between the terminal and the network.

In another embodiment of the present disclosure, sending the channel resource information to the terminal includes:

Based on the channel resource information, a signaling link release message is generated;

The generated signaling link release message is sent to the terminal.

In another embodiment of the present disclosure, the process of establishing a call connection includes:

receiving a call establishment request message, where the call establishment request message carries the terminal information, and the call establishment request message is used to instruct the terminal corresponding to the terminal information to establish a call connection;

forwarding the call establishment request message to the IP Multimedia Subsystem IMS, where the IMS is at least used to establish a call connection with the terminal;

A call establishment response message sent by the IMS is received, where the call establishment response message includes a call establishment success message or a call establishment failure message.

In another embodiment of the present disclosure, when a call establishment failure message is received, the method further includes:

The call establishment failure message is forwarded to the terminal to notify the terminal that the call establishment fails, and the call establishment failure message is used to instruct the terminal to switch to the ready-to-connect state in the circuit-switched mode.

In another embodiment of the present disclosure, the designated device is a mobile switching center MSC.

All the above-mentioned optional technical solutions can be combined to form optional embodiments of the present disclosure, which are not repeated in the embodiments of the present disclosure.

FIG. 2 is a flowchart of a method for establishing a call connection according to an exemplary embodiment. This embodiment is described by taking the method for establishing a call connection in a multi-party interaction manner as an example. The method for establishing a call connection may include the following: several steps.

In step 201, the terminal sends a call establishment request message to the management device, where the call establishment request message carries terminal information, and the call establishment request message is used to instruct the terminal corresponding to the terminal information to establish a call connection.

At present, with the rapid development of mobile communication technology, an LTE network has appeared. Compared with the traditional network, the data transmission rate of the TLE network has been significantly improved. Therefore, the LTE network has also been widely used. However, since the LTE network is an all-IP network, that is, the LTE network only includes the PS domain and does not include the CS domain. Therefore, in order to realize the voice call service based on the LTE network, the IMS is proposed in the communication technology field. IMS adopts VoLTE technology and cooperates with LTE network to realize end-to-end voice call service based on PS domain, so as to realize high-quality voice call service.

In addition, compared with establishing a call connection through the CS domain, in the process of establishing a call connection through the PS domain, there is no need to establish an exclusive channel resource for each terminal, that is, multiple terminals can share the same channel resource, thus achieving The effect of saving channel resources, therefore, under normal circumstances, when a terminal establishes a call connection, it generally first chooses to establish a call connection through the PS domain.

That is, the terminal sends a call establishment request message to the management device in the PS domain, and the call establishment request message carries the terminal information. The management device can at least perform data communication with the CS domain and the IMS, for example, the management device can be an MME, etc. In addition, the above-mentioned terminal information can include a terminal identifier or a user phone number, etc., wherein the terminal identifier can be used for unique Identifies a terminal.

The specific implementation manner of the above-mentioned IMS implementing the end-to-end PS domain-based voice call service by using the VoLTE technology and the LTE network may refer to the prior art, which is not limited in the embodiments of the present disclosure.

In step 202, the management device receives the call establishment request message, and forwards the call establishment request message to the IMS, where the IMS is at least used to establish a call connection with the terminal.

When the management device receives the call establishment request message, it forwards the call establishment request message to the IMS, so as to realize the establishment of the voice call in the PS domain through the IMS.

In step 203, after receiving the call establishment request message, the IMS determines whether a call connection can be established currently, and sends a call establishment response message to the management device, where the call establishment response message includes a call establishment success message or a call establishment failure message.

After receiving the call establishment request message, the IMS judges whether a call connection can be established with the terminal according to the current cell capacity, usage density and other conditions, and after determining whether a call connection can be established with the terminal, sends an establishment call to the management device. Call response message.

If it is determined that a call connection can be established with the terminal based on the current cell capacity, usage density and other conditions, the IMS sends a call establishment success message to the management device, and the call establishment success message carries resource information for establishing a call connection. For example, the resource information includes IP address information, port number, etc. for establishing a bearer connection. At this time, the management device sends the call establishment success message to the terminal, so that the terminal can establish a call connection based on the resource information. , that is, the terminal can establish a call connection through the PS domain. In this case, the subsequent steps 204 to 207 need not be performed. Conversely, if it is determined that a call connection cannot be established with the terminal based on conditions such as the current cell capacity and usage density, the IMS sends a call establishment failure message to the management device. In this case, subsequent steps 204 to 204 need to be performed. 207.

The specific implementation manner of the IMS determining whether a call connection with the terminal can be established according to conditions such as current cell capacity and usage density may refer to the prior art, which is not limited in the embodiments of the present disclosure.

In step 204, when receiving the call establishment failure message, the management device sends a call redirection request to the designated device, where the call redirection request at least carries terminal information, and the designated device is the one used for establishing the call connection in the CS domain. equipment.

When the management device receives the call establishment failure message, it indicates that the call connection cannot be established through the PS domain, that is, the terminal cannot establish the call connection based on the LTE network. In this case, in order to enable the terminal to still establish a voice call service, the management device sends a redirect call request to a designated device in the CS domain, that is, the management device replaces the terminal to the CS in the 2G or 3G network. The domain requested to establish a voice call. Wherein, in a possible implementation manner, the designated device is a mobile switching center MSC, and the MSC can at least be used to establish a channel resource for establishing a call for the terminal.

Among them, because in the CS domain, an exclusive channel resource needs to be established for each terminal, therefore, the redirect call request also needs to carry terminal information, so that the designated device in the CS domain is the terminal corresponding to the terminal information. Allocate unique channel resources.

In addition, when receiving the call establishment failure message, the management device may also forward the call establishment failure message to the terminal while sending a redirect call request to the designated device, so as to notify the terminal that the call establishment fails, and the call establishment fails. The failure message is used to instruct the terminal to switch to the ready-to-connect state in the circuit-switched mode. In this way, the terminal can switch to the ready-to-connect state in the circuit-switched mode in advance after receiving the call establishment failure message, thereby reducing the call establishment delay.

For a specific implementation manner of the foregoing terminal switching to the ready-to-connect state in the circuit-switched mode, reference may be made to the prior art, which is not limited in this embodiment of the present disclosure.

In step 205, the designated device establishes a channel resource for the terminal when receiving the call redirection request, and sends channel resource information corresponding to the channel resource to the management device.

The specific implementation process of establishing the channel resource for the terminal by the designated device may refer to the prior art, which is not limited in this embodiment of the present disclosure.

In step 206, the management device receives the channel resource information sent by the designated device, and sends the channel resource information to the terminal.

Wherein, sending the channel resource information to the terminal by the management device may include any of the following possible implementations;

The first way: the management device directly sends the channel resource information to the terminal.

In this implementation manner, after receiving the channel resource information sent by the designated device, the management device does not need to process the channel resource information, but directly sends the channel resource information to the terminal. The processing time of the channel resource information reduces the delay of establishing a call connection in a disguised form.

The second manner: based on the channel resource information, a signaling link release message is generated, and the generated signaling link release message is sent to the terminal.

In the actual application process, when the establishment of the call connection through the PS domain fails, in order to save the link resources, usually, the management device can release the signaling link resources with the terminal. Therefore, in this second implementation In the mode, the management device can generate the signaling link release message based on the channel resource information, so that the terminal obtains the channel resource from the signaling link release message after receiving the signaling link release message information, as such, can reduce signaling interactions.

The specific implementation manner of generating the signaling link release message based on the channel resource information may refer to the prior art, which is not limited in this embodiment of the present disclosure.

In step 207, after receiving the channel resource information, the terminal establishes a call connection through the channel resource indicated by the channel resource information.

If the terminal is not currently switched to the ready-to-connect state in the circuit-switched mode, the terminal switches from the current state to the ready-to-connect state in the circuit-switched mode, and establishes a call connection through the channel resource indicated by the channel resource information. If the terminal is currently switched to the ready-to-access state in the circuit-switched mode, after receiving the channel resource information, the terminal directly establishes a call connection through the channel resource indicated by the channel resource information.

The specific implementation of the terminal establishing the call connection through the channel resource indicated by the channel resource information may refer to the prior art, which is not limited in this embodiment of the present disclosure.

In addition, it should be noted that, in a possible implementation manner, when a call establishment failure message is received, not only the voice call service needs to be redirected to the CS domain, but also the data service needs to be redirected. The data service is redirected to the 3G network. For this reason, when the management device receives the failure message to establish a call, it also needs to send a redirected data connection request to the SGSN in the 3G network. The terminal establishes a data connection, that is, after receiving the redirected data connection request, the SGSN allocates an IP address to the terminal, and sends the IP address to the management device, and the management device sends the IP address to the terminal , so that the terminal redirects the data service to the 3G network, wherein the specific implementation principle of the terminal redirecting the data service to the 3G network is similar to the principle that the terminal redirects the voice call service to the CS domain above. The embodiments are not described in detail.

In the embodiment of the present disclosure, in the process of establishing a call connection by the terminal, when the establishment of the call connection through the PS domain fails, the management device in the PS domain (such as the mobility management entity MME, etc.) The designated device sends a redirect call request, so that the designated device allocates channel resources to the terminal, that is, the designated device returns channel resource information, and the management device sends the channel resource information to the terminal, so that the terminal passes the channel resource information. The indicated channel resource establishes a call connection, avoiding the need for the terminal to send a call connection request to the designated device in the CS domain again after receiving the connection establishment failure message, thereby reducing the call establishment delay. In addition, it is directly managed by the PS domain. The device sends the redirect call request to the designated device in the CS domain, which can reduce signaling overhead between the terminal and the network.

Fig. 3 is a block diagram of an apparatus for establishing a call connection according to an exemplary embodiment. The apparatus for establishing a call connection may be implemented by software, hardware or a combination of the two, and the apparatus for establishing a call connection includes a first sending module 310 , a first receiving module 320 and a second sending module 330 .

The first sending module 310 is configured to send a redirect call request to a designated device when a call establishment failure message is received during the process of establishing a call connection, where the redirect call request at least carries terminal information, and the designated device is A device used to establish a call connection in the circuit-switched CS domain, and the terminal information is information of a terminal requesting to establish a call connection;

The first receiving module 320 is configured to receive channel resource information sent by the designated device, where the channel resource information is established by the designated device for the terminal when the redirected call request is received;

The second sending module 330 is configured to send the channel resource information to the terminal, where the channel resource information is used to establish a call connection with the terminal.

Referring to FIG. 4 to FIG. 5 , in another embodiment of the present disclosure, the second sending module 330 includes:

a generating unit, configured to generate a signaling link release message based on the channel resource information;

A sending unit, configured to send the generated signaling link release message to the terminal.

In another embodiment of the present disclosure, the device further includes:

The second receiving module 340 is configured to receive a call establishment request message, where the call establishment request message carries the terminal information, and the call establishment request message is used to instruct the terminal corresponding to the terminal information to establish a call connection;

a first forwarding module 350, configured to forward the call establishment request message to the IP multimedia subsystem IMS, where the IMS is at least used to establish a call connection with the terminal;

The third receiving module 360 is configured to receive a call establishment response message sent by the IMS, where the call establishment response message includes a call establishment success message or a call establishment failure message.

In another embodiment of the present disclosure, the device further includes:

The second forwarding module 370 is configured to forward the call establishment failure message to the terminal to notify the terminal that the call establishment failed, and the call establishment failure message is used to instruct the terminal to switch to the ready-to-connect state in the circuit-switched mode.

In another embodiment of the present disclosure, the designated device is a mobile switching center MSC.

In the embodiment of the present disclosure, in the process of establishing a call connection by the terminal, when the establishment of the call connection through the PS domain fails, the management device in the PS domain (such as the mobility management entity MME, etc.) The designated device sends a redirect call request, so that the designated device allocates channel resources to the terminal, that is, the designated device returns channel resource information, and the management device sends the channel resource information to the terminal, so that the terminal passes the channel resource information. The indicated channel resource establishes a call connection, avoiding the need for the terminal to send a call connection request to the designated device in the CS domain again after receiving the connection establishment failure message, thereby reducing the call establishment delay. In addition, it is directly managed by the PS domain. The device sends the redirect call request to the designated device in the CS domain, which can reduce signaling overhead between the terminal and the network.

The first sending module 310, the second sending module 330, the first forwarding module 350 and the second forwarding module 370 can all be transmitters or transceivers, and the first receiving module 320, the second receiving module 340 and the third receiving module above 360 can be a receiver or a transceiver, and the first sending module 310, the second sending module 330, the first forwarding module 350, the second forwarding module 370, the first receiving module 320, the second receiving module 340 and the third The receiving modules 360 can all be integrated together to form a transceiver module, which is implemented as a transceiver corresponding to hardware.

Regarding the apparatus in the above-mentioned embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

Fig. 6 is a block diagram of a management device according to an exemplary embodiment, which can implement the method for establishing a call connection provided by the present disclosure. The management device includes a transmitter 632, a receiver 631, and a processor 633 connected to the transmitter 632 and the receiver 631, respectively, wherein the processor 633 is configured to perform the following steps:

In the process of establishing a call connection, when a call establishment failure message is received, the transmitter 632 sends a call redirection request to the designated device, where the call redirection request at least carries terminal information, and the designated device is in the circuit-switched CS domain A device for establishing a call connection, the terminal information is the information of the terminal requesting to establish a call connection;

Receive channel resource information sent by the designated device through the receiver 631, where the channel resource information is established for the terminal by the designated device when receiving the redirect call request;

The channel resource information is sent to the terminal through the transmitter 632, and the channel resource information is used to establish a call connection with the terminal.

In another embodiment of the present disclosure, the processor 633 is configured to:

Based on the channel resource information, a signaling link release message is generated;

The generated signaling link release message is sent to the terminal.

In another embodiment of the present disclosure, the processor 633 is configured to:

Receive a call setup request message through the receiver 631, where the call setup request message carries the terminal information, and the call setup request message is used to instruct the terminal corresponding to the terminal information to establish a call connection;

Forward the call establishment request message to the IP multimedia subsystem IMS through the transmitter 632, where the IMS is at least used to establish a call connection with the terminal;

The call establishment response message sent by the IMS is received by the receiver 631, and the call establishment response message includes a call establishment success message or a call establishment failure message.

In another embodiment of the present disclosure, the processor 633 is configured to:

The call establishment failure message is forwarded to the terminal through the transmitter 632 to notify the terminal that the call establishment fails, and the call establishment failure message is used to instruct the terminal to switch to the ready-to-connect state in the circuit-switched mode.

In another embodiment of the present disclosure, the designated device is a mobile switching center MSC.

In the embodiment of the present disclosure, in the process of establishing a call connection by the terminal, when the establishment of the call connection through the PS domain fails, the management device in the PS domain (such as the mobility management entity MME, etc.) The designated device sends a redirect call request, so that the designated device allocates channel resources to the terminal, that is, the designated device returns channel resource information, and the management device sends the channel resource information to the terminal, so that the terminal passes the channel resource information. The indicated channel resource establishes a call connection, avoiding the need for the terminal to send a call connection request to the designated device in the CS domain again after receiving the connection establishment failure message, thereby reducing the call establishment delay. In addition, it is directly managed by the PS domain. The device sends the redirect call request to the designated device in the CS domain, which can reduce signaling overhead between the terminal and the network.

Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or techniques in the technical field not disclosed by the present disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (7)

1. A method of establishing a telephony connection, the method being performed by a management device in a packet switched, PS, domain, the method comprising:

in the process of establishing call connection through the PS domain, when a call establishing failure message sent by an IP multimedia subsystem IMS is received, a call redirecting request is sent to a designated device, wherein the call redirecting request at least carries terminal information, the designated device is a device used for establishing call connection in a circuit switching CS domain, and the terminal information is information of a terminal requesting to establish call connection;

forwarding the call establishment failure message to the terminal to inform the terminal of call establishment failure, wherein the call establishment failure message is used for indicating the terminal to be switched to a ready connection state in a circuit switching mode;

receiving channel resource information sent by the appointed equipment, wherein the channel resource information is established for the terminal by the appointed equipment when the appointed equipment receives the redirection call request;

generating a signaling link release message based on the channel resource information;

and sending the generated signaling link release message to the terminal.

2. The method of claim 1, wherein the process of establishing a call connection comprises:

receiving a call establishment request message, wherein the call establishment request message carries the terminal information and is used for indicating a terminal corresponding to the terminal information to establish call connection;

forwarding the call establishment request message to the IMS, wherein the IMS is at least used for establishing call connection with the terminal;

and receiving a call establishment response message sent by the IMS, wherein the call establishment response message comprises a call establishment success message or a call establishment failure message.

3. The method of claim 1, wherein the designated device is a Mobile Switching Center (MSC).

4. An apparatus for establishing a telephony connection, the apparatus being for a management device in a packet switched, PS, domain, the apparatus comprising:

a first sending module, configured to send a redirection call request to a designated device when receiving a call establishment failure message sent by an IP multimedia subsystem IMS in a process of establishing a call connection through the PS domain, where the redirection call request at least carries terminal information, the designated device is a device in a circuit switched CS domain, and the terminal information is information of a terminal requesting to establish a call connection;

a first receiving module, configured to receive channel resource information sent by the designated device, where the channel resource information is established for the terminal when the designated device receives the redirect call request;

a second sending module comprising:

a generating unit, configured to generate a signaling link release message based on the channel resource information;

a sending unit, configured to send the generated signaling link release message to the terminal;

the device further comprises:

and the second forwarding module is used for forwarding the call establishment failure message to the terminal so as to inform the terminal of call establishment failure, wherein the call establishment failure message is used for indicating that the terminal is switched to a ready connection state in a circuit switching mode.

5. The apparatus of claim 4, further comprising:

a second receiving module, configured to receive a call establishment request message, where the call establishment request message carries the terminal information, and the call establishment request message is used to instruct a terminal corresponding to the terminal information to establish a call connection;

a first forwarding module, configured to forward the call establishment request message to the IMS, where the IMS is at least configured to establish a call connection with the terminal;

a third receiving module, configured to receive a call setup response message sent by the IMS, where the call setup response message includes a call setup success message or a call setup failure message.

6. The apparatus of claim 4, wherein the designated device is a Mobile Switching Center (MSC).

7. An apparatus for establishing a telephony connection, the apparatus being for a management device in a packet switched, PS, domain, the apparatus comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to:

in the process of establishing call connection through the PS domain, when a call establishing failure message sent by an IP multimedia subsystem IMS is received, a call redirecting request is sent to a designated device, wherein the call redirecting request at least carries terminal information, the designated device is a device used for establishing call connection in a circuit switching CS domain, and the terminal information is information of a terminal requesting to establish call connection;

forwarding the call establishment failure message to the terminal to inform the terminal of call establishment failure, wherein the call establishment failure message is used for indicating the terminal to be switched to a ready connection state in a circuit switching mode;

receiving channel resource information sent by the appointed equipment, wherein the channel resource information is established for the terminal by the appointed equipment when the appointed equipment receives the redirection call request;

generating a signaling link release message based on the channel resource information;

and sending the generated signaling link release message to the terminal.

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