CN105873241B - Method and device for establishing call connection - Google Patents
Method and device for establishing call connection Download PDFInfo
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- CN105873241B CN105873241B CN201610280316.XA CN201610280316A CN105873241B CN 105873241 B CN105873241 B CN 105873241B CN 201610280316 A CN201610280316 A CN 201610280316A CN 105873241 B CN105873241 B CN 105873241B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/18—Management of setup rejection or failure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
- H04W76/34—Selective release of ongoing connections
- H04W76/36—Selective release of ongoing connections for reassigning the resources associated with the released connections
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Abstract
The disclosure relates to a method and a device for establishing call connection, and relates to the technical field of communication. The method comprises the steps of sending a redirection call request to a specified device when receiving a call establishment failure message in the process of establishing call connection, wherein the specified device is a device used for establishing call connection in a Circuit Switching (CS) domain, receiving channel resource information sent by the specified device, the channel resource information is established for a terminal by the specified device when receiving the redirection call request, and sending the channel resource information to the terminal, the channel resource information is used for establishing call connection with the terminal, namely, in the process of establishing call connection for the terminal, when the call connection is failed to be established through a Packet Switched (PS) domain, a management device in the PS domain sends the redirection call request to the specified device in the CS domain, so that the specified device establishes channel resources for the terminal, and the terminal can establish call connection through the channel resources, thereby reducing call setup delay.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for establishing a call connection.
Background
Currently, in a mobile communication network, a terminal can establish a call connection through two switching modes, including: a circuit switched mode and a packet switched mode, where for the circuit switched mode, it means that a call connection is established through a CS (circuit switched) domain, and in this implementation, the CS domain needs to allocate an exclusive channel resource to each terminal, so that the terminal establishes a call connection through the channel resource; in the Packet switching mode, the call connection is established through a PS (Packet Switch) domain, and in this implementation, different terminals may share the same channel resource, that is, in the same channel resource, different terminals may implement the call connection establishment through Packet transmission of data packets.
In the practical application process, in order to save channel resources, a terminal generally first selects to establish a call connection through a PS domain, that is, the terminal sends a call connection establishment request to an IMS (IP Multimedia Subsystem) for implementing a voice service in an IP (Internet Protocol) network through the PS domain, when the call connection establishment 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 after receiving the connection establishment failure message, the terminal establishes a call connection through a CS domain, that is, the terminal sends a call connection establishment request to a device in the CS domain responsible for establishing a call connection, so that the device in charge of establishing a call connection establishes channel resources for the terminal, and thus the terminal establishes a call connection through the established channel resources.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a method and an apparatus for establishing a call connection.
In a first aspect, a method for establishing a call connection is provided, where the method includes:
in the process of establishing a call connection, when a call failure establishing message is received, sending a call redirecting request to a specified device, wherein the call redirecting request at least carries terminal information, the specified device is a device used for establishing the call connection in a Circuit Switching (CS) domain, and the terminal information is information of a terminal requesting to establish the call connection;
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;
and sending the channel resource information to the terminal, wherein the channel resource information is used for establishing a call connection with the terminal.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the sending the channel resource information to the terminal includes:
generating a signaling link release message based on the channel resource information;
and sending the generated signaling link release message to the terminal.
With reference to the first aspect, in a second possible implementation manner of the first aspect, the establishing a call connection includes:
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 an IP Multimedia Subsystem (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.
With reference to the first aspect, in a third possible implementation manner of the first aspect, when the message that the call setup fails is received, the method further includes:
and 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.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the specific 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 used for sending a redirection call request to a designated device when a call establishment failure message is received in the process of establishing call connection, wherein the redirection call 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;
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;
and the second sending module is used for sending the channel resource information to the terminal, and the channel resource information is used for establishing a call connection with the terminal.
With reference to the second aspect, in a first possible implementation manner of the 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 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 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 an IP multimedia subsystem 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.
With reference to the second aspect, in a third possible implementation manner of the second aspect, the apparatus further includes:
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.
With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the specific device is a mobile switching center MSC.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: in the process of establishing the call connection by the terminal, when the call connection establishment through the PS domain fails, a management device (such as a Mobility Management Entity (MME) and the like) in the PS domain sends a call redirection request to a specified device for establishing the call connection in the CS domain, so that the specified device allocates channel resources for the terminal, i.e., the specified device returns channel resource information, the management device transmits the channel resource information to the terminal, the terminal establishes the call connection through the channel resource indicated by the channel resource information, thereby avoiding the need that the terminal sends the call connection establishment request to the specified device in the CS domain again after receiving the connection establishment failure message, therefore, the call establishment delay is reduced, and in addition, the management equipment in the PS domain directly sends the call redirection request to the specified equipment in the CS domain, so that the signaling overhead between the terminal and the network can be reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1A is a schematic diagram illustrating one implementation environment in accordance with an illustrative embodiment.
Fig. 1B is a flow chart illustrating a method for establishing a call connection according to an example embodiment.
Fig. 2 is a flow chart illustrating a method of establishing a call connection according to another example embodiment.
Fig. 3 is a block diagram illustrating an apparatus for establishing a telephony connection in accordance with an example embodiment.
Fig. 4 is a block diagram illustrating an apparatus for establishing a telephony connection in accordance with another exemplary embodiment.
Fig. 5 is a block diagram illustrating an apparatus for establishing a telephony connection in accordance with another exemplary embodiment.
FIG. 6 is a block diagram illustrating a management device in accordance with an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Fig. 1A is a schematic diagram illustrating an implementation environment according to an exemplary embodiment, where the implementation environment mainly includes a CS domain 110, a PS domain 120, an IMS 130, and a terminal 140, where the CS domain 110, the PS domain 120, and the IMS 130 may communicate with each other, and the terminal 140 may establish a call connection through the CS domain 110 or through the PS domain 120.
The CS domain 110 mainly includes an MSC (Mobile Switching Center) 110a and a target access network 110b, where The MSC 110a can be at least used to establish a call connection with The terminal 140 in The CS domain, that is, The MSC 110a can be at least used to establish a channel resource For The terminal 140, and The MSC 110a is included in a GSM (Global System For Mobile communication) network and a 3G (Third Generation) network. In different networks, the target Access Network 110b is different, For example, in GSM, the target Access Network is a GERAN (Global System For Mobile Communication Edge Radio Access Network, GSM Edge Radio Access Network), and in 3G Network, the target Access Network 110b is a terrestrial Radio Access Network of UTRAN (UMTS terrestrial Radio Access Network, UMTS (Universal Mobile Telecommunications System)), and the target Access Network 110b is responsible For forwarding Communication data between the terminal 140 and the MSC 110a, that is, in an actual implementation process, the terminal 140 needs to forward the Communication data to the MSC 110a through the target Access Network 110b, and similarly, the MSC 110a also needs to forward the Communication data to the terminal 140 through the target Access Network 110 b. It should be noted that, in the following description, the procedure of forwarding the communication data by the target access network 110b is not described in detail, that is, the following description will be directly described in a manner similar to the way the terminal 140 sends the communication data to the MSC 110 a.
The PS domain 120 mainly includes a management device 120a, an SGSN (Serving GPRS (General packet radio Service) Support Node, a GPRS Service Support Node) 120b, an E-UTRAN (Evolved UTRAN)120c, and a gateway 120 d. In an LTE (Long Term Evolution) network, The Management device 120a may be an MME (Mobility Management Entity), and in other networks, The Management device 120a may also be other devices, for example, in a possible implementation, if in a 5G (Fifth Generation) network, The Management device 120a may also be a control plane device, and The Management device 120a is mainly used to acquire channel resource information from The MSC 110a in The CS domain. The SGSN 120b may be configured to assign an IP address to the terminal 140, the E-UTRAN 120c may be configured to forward communication data between the terminal 140 and the management device 120a in the PS domain, and the gateway 120d is configured to forward communication data between the IMS 130 and the management device 120a in the PS domain, which is the same as the above, and the forwarding procedure is not described in detail below.
The IMS 130 may implement an end-to-end Voice call service based on a PS domain based on a Voice over LTE (Voice over LTE) technical scheme in cooperation with an LTE network or a 4G (The Forth Generation) core network, where The Voice over LTE technology is an IP (Internet Protocol) data transmission technology, that is, The terminal 140 may implement The Voice call service through an IP network by using The Voice over LTE technology.
The terminal 140 may be at least used for establishing a call connection, for example, the terminal 140 may be a call device such as a mobile phone.
Fig. 1B is a flowchart illustrating a method for establishing a call connection according to an exemplary embodiment, which may include the following steps.
In step 101, in the process of establishing a call connection, when a call failure establishment message is received, a call redirection request is sent to a designated device, where the call redirection request carries at least terminal information, the designated device is a device in a circuit switching CS domain for establishing a call connection, and the terminal information is information of a terminal requesting to establish a call connection.
In step 102, receiving channel resource information sent by the specified device, where the channel resource information is established by the specified device for the terminal 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 for establishing a call connection with the terminal.
In the embodiment of the present disclosure, in the process of establishing the call connection by the terminal, when the call connection establishment through the PS domain fails, sending a request for redirecting the call to a specified device for establishing the call connection in the CS domain by a management device (such as a Mobile Management Entity (MME) and the like) in the PS domain, so that the specified device allocates channel resources for the terminal, i.e., the specified device returns channel resource information, the management device transmits the channel resource information to the terminal, the terminal establishes the call connection through the channel resource indicated by the channel resource information, thereby avoiding the need that the terminal sends the call connection establishment request to the specified device in the CS domain again after receiving the connection establishment failure message, therefore, the call establishment delay is reduced, and in addition, the management equipment in the PS domain directly sends the call redirection request to the specified equipment in the CS domain, so that the signaling overhead between the terminal and the network can be reduced.
In another embodiment of the present disclosure, sending the channel resource information to the terminal includes:
generating a signaling link release message based on the channel resource information;
and sending the generated signaling link release message to the terminal.
In another embodiment of the present disclosure, the process of establishing a call connection includes:
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 an IP Multimedia Subsystem (IMS), wherein the IMS is at least used for establishing call connection with the terminal;
and receiving a call setup response message sent by the IMS, wherein the call setup response message comprises a call setup success message or a call setup failure message.
In another embodiment of the present disclosure, when receiving the call setup failure message, the method further includes:
and 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.
In another embodiment of the present disclosure, the specified device is a mobile switching center MSC.
All the above optional technical solutions can be combined arbitrarily to form optional embodiments of the present disclosure, and the embodiments of the present disclosure are not described in detail again.
Fig. 2 is a flowchart illustrating a method for establishing a call connection according to an exemplary embodiment, where the method for establishing a call connection is implemented in a multi-party interactive manner in this embodiment as an example, and the method for establishing a call connection may include the following 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 appears, and compared with a conventional network, the data transmission rate of the TLE network is significantly improved, so that the LTE network is also widely applied. However, since the LTE network is an all-IP network, that is, the LTE network only includes a PS domain and does not include a CS domain, in order to implement a voice call service based on the LTE network, an IMS is proposed in the field of communication technology, and the IMS implements an end-to-end voice call service based on the PS domain by using a VoLTE technology in cooperation with the LTE network, thereby implementing a high-quality voice call service.
In addition, compared with the call connection established through the CS domain, in the implementation process of establishing the call connection through the PS domain, it is not necessary to establish an exclusive channel resource for each terminal, that is, multiple terminals can share the same channel resource, so as to achieve the effect of saving the channel resource.
That is, the terminal sends a call setup request message to the management device in the PS domain, where the call setup request message carries terminal information. The management device may be at least capable of performing data communication with the CS domain and the IMS, for example, the management device may be an MME, and the terminal information may include a terminal identifier or a user telephone number, where the terminal identifier may be used to uniquely identify one terminal.
The IMS uses the VoLTE technology and cooperates with the LTE network to implement a specific implementation manner of an end-to-end voice call service based on a PS domain, which is referred to in the prior art and is not limited in the embodiments of the present disclosure.
In step 202, the management device receives the call setup request message and forwards the call setup request message to an IMS, where the IMS is at least used for establishing a call connection with the terminal.
And when receiving the call establishment request message, the management equipment 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 at present, 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 determines whether a call connection can be established with the terminal according to conditions such as the current cell capacity and the usage density, and sends a call establishment response message to the management device after determining whether a call connection can be established with the terminal.
If it is determined that a call connection can be established with the terminal based on conditions such as current cell capacity and usage density, the IMS sends a call establishment success message to the management device, where the call establishment success message carries resource information used for establishing a call connection, for example, the resource information includes IP address information, port number, and the like used for establishing a bearer connection, and 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 a PS domain, and in this case, the subsequent steps 204 to 207 need not be executed. On the contrary, if it is determined that the call connection cannot be established with the terminal based on the conditions of the current cell capacity, the use density, and the like, the IMS sends a call establishment failure message to the management device, in which case, the subsequent steps 204 to 207 will need to be performed.
The specific implementation manner of the IMS determining whether the call connection with the terminal can be established according to the conditions of the current cell capacity, the use density, and the like may refer to the prior art, which is not limited in the embodiment of the present disclosure.
In step 204, when receiving the call establishment failure message, the management device sends a call redirection request to a designated device, where the call redirection request at least carries terminal information, and the designated device is a device in the CS domain for establishing a call connection.
When the management device receives the message of failed call establishment, 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 the voice call service, the management device sends a redirect call request to a specified device in the CS domain, that is, the management device requests the CS domain in the 2G or 3G network to establish the voice call instead of the terminal. In a possible implementation manner, the specific device is a mobile switching center MSC, and the MSC is at least used for establishing channel resources for establishing a call for the terminal.
Since an exclusive channel resource needs to be established for each terminal in the CS domain, the terminal information also needs to be carried in the redirect call request, so that the specified device in the CS domain allocates a unique channel resource to the terminal corresponding to the terminal information.
In addition, when receiving the call establishment failure message, the management device may further forward the call establishment failure message to the terminal while sending the call redirection request to the designated device, so as to notify the terminal of a call establishment failure, where the call establishment failure message is used to indicate that the terminal is switched to a ready-to-connect state in a circuit switched mode. Therefore, the terminal can be switched to the ready connection state in the circuit switching mode in advance after receiving the message of the call establishment failure, and the call establishment delay can be reduced.
For a specific implementation manner of switching the terminal 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 disclosure.
In step 205, the designated device establishes a channel resource for the terminal when receiving the redirecting call request, and sends channel resource information corresponding to the channel resource to the management device.
For a specific implementation process of the designated device for establishing the channel resource for the terminal, reference may be made to the prior art, which is not limited in this disclosure.
In step 206, the management device receives the channel resource information transmitted by the specified device and transmits the channel resource information to the terminal.
The sending, by the management device, the channel resource information to the terminal may include any one of the following possible implementations;
the first mode is as follows: the management device directly transmits the channel resource information to the terminal.
In this implementation, after receiving the channel resource information sent by the specified device, the management device does not need to process the channel resource information, but directly sends the channel resource information to the terminal, so that the processing time of the channel resource information is saved, and the delay for establishing a call connection is reduced in a phase-changing manner.
The second mode is as follows: and generating a signaling link release message based on the channel resource information, and sending the generated signaling link release message to the terminal.
In an actual application process, when the call connection establishment through the PS domain fails, in order to save link resources, in a normal case, the management device may release signaling link resources between the management device and the terminal, and therefore, in the second implementation manner, the management device may generate the signaling link release message based on the channel resource information, so that the terminal obtains the channel resource information from the signaling link release message after receiving the signaling link release message, and thus, signaling interaction may be reduced.
For a specific implementation manner of generating the signaling link release message based on the channel resource information, reference may be made to the prior art, which is not limited in this 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.
And if the terminal is not switched to the ready connection state in the circuit switching mode currently, the terminal is switched to the ready connection state in the circuit switching mode from the current state, and the call connection is established through the channel resources indicated by the channel resource information. If the terminal has switched to the ready-to-access state in the circuit switching mode, the terminal directly establishes a call connection through the channel resource indicated by the channel resource information after receiving the channel resource information.
For a specific implementation manner of the terminal establishing the call connection through the channel resource indicated by the channel resource information, reference may be made to the prior art, which is not limited in the embodiment of the present disclosure.
In addition, it should be noted that, in a possible implementation manner, when receiving the call setup failure message, the management device needs to redirect not only the voice call service to the CS domain but also the data service, for example, redirect the data service to the 3G network, and for this reason, when receiving the call setup failure message, the management device needs to send a connection request for redirecting data to the SGSN in the 3G network, where the connection request for redirecting data is used to instruct to setup data connection with the terminal, that is, after receiving the connection request for redirecting data, 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, where a specific implementation principle of redirecting the data service to the 3G network by the terminal and a principle class of redirecting the voice call service to the CS domain by the terminal are described above Similarly, embodiments of the disclosure are not described in detail.
In the embodiment of the present disclosure, in the process of establishing the call connection by the terminal, when the call connection establishment through the PS domain fails, sending a request for redirecting the call to a specified device for establishing the call connection in the CS domain by a management device (such as a Mobile Management Entity (MME) and the like) in the PS domain, so that the specified device allocates channel resources for the terminal, i.e., the specified device returns channel resource information, the management device transmits the channel resource information to the terminal, the terminal establishes the call connection through the channel resource indicated by the channel resource information, thereby avoiding the need that the terminal sends the call connection establishment request to the specified device in the CS domain again after receiving the connection establishment failure message, therefore, the call establishment delay is reduced, and in addition, the management equipment in the PS domain directly sends the call redirection request to the specified equipment in the CS domain, so that the signaling overhead between the terminal and the network can be reduced.
Fig. 3 is a block diagram illustrating an apparatus for establishing a telephony connection in accordance with an example embodiment. The device for establishing a call connection may be implemented by software, hardware or a combination of the two, and 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, in a process of establishing a call connection, send a redirection call request to a designated device when receiving a call establishment failure message, where the redirection call request at least carries terminal information, the designated device is a device in a circuit switching 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 specified device, where the channel resource information is established for the terminal when the specified device receives the redirecting call request;
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 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 apparatus further comprises:
a second receiving module 340, 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 350, configured to forward the call establishment request message to an IP multimedia subsystem IMS, where the IMS is at least configured to establish a call connection with the terminal;
a third receiving module 360, 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.
In another embodiment of the present disclosure, the apparatus further comprises:
a second forwarding module 370, configured to forward the call setup failure message to the terminal to notify the terminal of the call setup failure, where the call setup failure message is used to indicate that the terminal is switched to a ready-to-connect state in a circuit switched mode.
In another embodiment of the present disclosure, the specified device is a mobile switching center MSC.
In the embodiment of the present disclosure, in the process of establishing the call connection by the terminal, when the call connection establishment through the PS domain fails, sending a request for redirecting the call to a specified device for establishing the call connection in the CS domain by a management device (such as a Mobile Management Entity (MME) and the like) in the PS domain, so that the specified device allocates channel resources for the terminal, i.e., the specified device returns channel resource information, the management device transmits the channel resource information to the terminal, the terminal establishes the call connection through the channel resource indicated by the channel resource information, thereby avoiding the need that the terminal sends the call connection establishment request to the specified device in the CS domain again after receiving the connection establishment failure message, therefore, the call establishment delay is reduced, and in addition, the management equipment in the PS domain directly sends the call redirection request to the specified equipment in the CS domain, so that the signaling overhead between the terminal and the network can be reduced.
The first sending module 310, the second sending module 330, the first forwarding module 350, and the second forwarding module 370 may all be transmitters or transceivers, the first receiving module 320, the second receiving module 340, and the third receiving module 360 may all be receivers or transceivers, 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 receiving module 360 may all be integrated together to form a transceiver module, which is implemented as a transceiver corresponding to hardware.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 6 is a block diagram illustrating 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 comprises 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 failure establishment message is received, a transmitter 632 sends a call redirection request to a designated device, where the call redirection request carries at least terminal information, the designated device is a device in a circuit switching CS domain for establishing a call connection, and the terminal information is information of a terminal requesting to establish a call connection;
receiving, by the receiver 631, channel resource information sent by the specified device, the channel resource information being established by the specified device for the terminal upon receiving the redirected call request;
the channel resource information is transmitted to the terminal through the transmitter 632, and the channel resource information is used for establishing a call connection with the terminal.
In another embodiment of the present disclosure, the processor 633 is configured to:
generating a signaling link release message based on the channel resource information;
and sending the generated signaling link release message to the terminal.
In another embodiment of the present disclosure, the processor 633 is configured to:
receiving, by the receiver 631, a call setup request message, where the call setup request message carries the terminal information, and the call setup request message is used to instruct a terminal corresponding to the terminal information to setup a call connection;
forwarding the call establishment request message to an IP multimedia subsystem, IMS, via a transmitter 632, the IMS being at least configured to establish a call connection with the terminal;
a call setup response message sent by the IMS is received through the receiver 631, and includes a call setup success message or a call setup failure message.
In another embodiment of the present disclosure, the processor 633 is configured to:
the call setup failure message is forwarded to the terminal via the transmitter 632 to inform the terminal of the call setup failure, and the call setup 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 the call connection by the terminal, when the call connection establishment through the PS domain fails, sending a request for redirecting the call to a specified device for establishing the call connection in the CS domain by a management device (such as a Mobile Management Entity (MME) and the like) in the PS domain, so that the specified device allocates channel resources for the terminal, i.e., the specified device returns channel resource information, the management device transmits the channel resource information to the terminal, the terminal establishes the call connection through the channel resource indicated by the channel resource information, thereby avoiding the need that the terminal sends the call connection establishment request to the specified device in the CS domain again after receiving the connection establishment failure message, therefore, the call establishment delay is reduced, and in addition, the management equipment in the PS domain directly sends the call redirection request to the specified equipment in the CS domain, so that the signaling overhead between the terminal and the network can be reduced.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the 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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| US10178585B2 (en) * | 2016-11-09 | 2019-01-08 | Mediatek Inc. | Enhanced multimedia call control in next generation mobile communication systems |
| CN108616558B (en) * | 2016-12-26 | 2021-03-19 | 展讯通信（上海）有限公司 | Method and device for establishing call and user equipment |
| EP3496460A1 (en) * | 2017-02-08 | 2019-06-12 | HTC Corporation | Device and method of handling a connection in a wireless communication system |
| US20200228578A1 (en) * | 2017-05-19 | 2020-07-16 | Huawei Technologies Co., Ltd. | Call Setup Method and Apparatus |
| CN111801964B (en) * | 2018-07-13 | 2021-12-31 | 华为技术有限公司 | Wireless communication method and device |
| CN109526051B (en) * | 2018-11-29 | 2021-09-07 | 维沃移动通信有限公司 | Method and terminal equipment for establishing multimedia communication |
| CN111918347A (en) * | 2020-07-03 | 2020-11-10 | 维沃移动通信有限公司 | Method and device for processing call origination exception |
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