WO2022083552A1 - 呼叫处理方法、装置及存储介质 - Google Patents

呼叫处理方法、装置及存储介质 Download PDF

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Publication number
WO2022083552A1
WO2022083552A1 PCT/CN2021/124452 CN2021124452W WO2022083552A1 WO 2022083552 A1 WO2022083552 A1 WO 2022083552A1 CN 2021124452 W CN2021124452 W CN 2021124452W WO 2022083552 A1 WO2022083552 A1 WO 2022083552A1
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Prior art keywords
called
network
scc
domain
request message
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PCT/CN2021/124452
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English (en)
French (fr)
Inventor
潘晓刚
吴凤伟
张云华
孙兵
魏海涛
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华为技术有限公司
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Publication of WO2022083552A1 publication Critical patent/WO2022083552A1/zh

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a call processing method, device, and storage medium.
  • LTE Long Term Evolution
  • PS Packet Switched
  • CS Circuit Switched
  • the 2G/3G network in the CS network and the LTE network are often used to overlap the service area, and the LTE network is used to provide PS network services for user equipment (User Equipment, UE).
  • the CS retry (RETRY) process is started to redirect to the 2G/3G network to execute the service, and return to the LTE network after the service ends.
  • the related technology only distinguishes between the PS domain and the CS domain. If the UE receives the called request when registering in the 5G network and the called voice dedicated bearer in the PS domain fails to be established, it will switch domains to the CS domain by starting the CS RETRY process. Retry. However, the UE is still registered in the 5G network after the called voice dedicated load fails to be established. The CS RETRY process started cannot be paged to the UE, and the UE also loses the opportunity to retry the called party, thereby reducing the UE's voice call pass rate.
  • a call processing method, device and storage medium are proposed.
  • VOICE Over NR VOICE Over NR
  • the network can use other voice solutions to initiate a call to the called UE again, which can improve the connection rate of the calling UE to initiate a call to the called UE and meet the user's call requirements.
  • an embodiment of the present application provides a call processing method, the method comprising:
  • the Proxy-Call Session Control Function (P-CSCF) device receives the called request message of the UE, and the UE is the called terminal registered in the 5G network;
  • the P-CSCF device determines that the UE has failed to establish the called voice dedicated bearer in the PS domain
  • the P-CSCF device sends a cancel message to the UE, and the cancel message is used to instruct the UE to select the 4G network and perform joint registration.
  • the P-CSCF device sends a cancel message to the called UE after determining that the called terminal registered in the 5G network, that is, the called UE, fails to establish the called voice dedicated bearer in the PS domain to indicate the called UE.
  • the called UE can be instructed to select the 4G network and perform joint registration through the cancel message, so as to cooperate with the CS RETRY process of the network to initiate a call to the called UE again.
  • the above-mentioned selection of the 4G network by the UE may be for the UE to switch to the 4G network or the UE to switch from the 5G network to the 4G network.
  • the above-mentioned UE registration in the 5G network may be for the UE to reside in the 5G network.
  • the method further includes:
  • the P-CSCF device sends a notification message to the Service Centralization and Continuity Application Server (SCC AS), where the notification message is used to instruct the SCC AS to perform a domain change call to the UE.
  • SCC AS Service Centralization and Continuity Application Server
  • the P-CSCF device when the called UE is registered in the 5G network, the P-CSCF device sends a message to the called UE after the P-CSCF device determines that the called UE fails to establish the called voice dedicated bearer in the PS domain.
  • a notification message is sent to the SCC AS to instruct the called UE to select the 4G network and perform joint registration, and the notification message to instruct the SCC AS to perform a domain change call to the called UE;
  • the called UE and the SCC AS perform the CS RETRY process synchronously, which further improves the call-through rate of the called UE.
  • the cancellation message or the notification message carries the indication information of the bearer resource allocation failure.
  • the cancellation message or the notification message carries the indication information of the bearer resource allocation failure, that is, the indication information of the bearer resource allocation failure is used to instruct the called UE or the SCC AS to perform corresponding operations, ensuring that the P-CSCF equipment It can clearly indicate the called UE or the SCC AS, which ensures the reliability of the subsequent retry of the domain switching call.
  • the P-CSCF device receives the called request message of the UE, including:
  • the P-CSCF device receives the called request message of the UE sent by the SCC AS, and the called request message carries a retry identifier, and the retry identifier is used to indicate that the network supports the retry function of switching domain calls after the establishment of the called voice dedicated bearer fails;
  • the P-CSCF device sends the called request message to the UE.
  • the operator's CS RETRY function is disabled, in this implementation manner, after receiving the called request message carrying the retry identifier sent by the SCC AS through the P-CSCF device, it notifies the network of the called UE through the retry identifier.
  • the reason field carried in the reason header of the cancellation message or the notification message is a preset value, and the preset value is used for Indicates that resource allocation failed.
  • the reason field carried in the reason header of the cancellation message or the notification message is a preset value, that is, the reason field with the preset value is used to instruct the called UE or the SCC AS to perform corresponding operations, which further ensures that The P-CSCF device can clearly indicate the called UE or the SCC AS, which improves the reliability of the subsequent call retry for switching domains.
  • an embodiment of the present application provides a call processing method, the method comprising:
  • the UE receives the called request message sent by the P-CSCF device, and the UE is the called terminal registered in the 5G network;
  • the UE After receiving the cancellation message sent by the P-CSCF device, the UE selects the 4G network and performs joint registration.
  • the cancellation message carries the indication information of the bearer resource allocation failure.
  • the called request message carries a retry identifier
  • the retry identifier is used to indicate that the network supports the retry of the domain switching call after the called voice dedicated bearer fails to be established. test function.
  • the reason field carried in the reason header of the cancellation message is a preset value, and the preset value is used to indicate resource allocation fail.
  • an embodiment of the present application provides a call processing method, the method comprising:
  • the SCC AS receives the called request message of the UE, and the UE is the called terminal registered in the 5G network;
  • the SCC AS After the SCC AS receives the notification message sent by the P-CSCF device, the SCC AS performs a domain switch call to the UE;
  • the P-CSCF device is used to send a cancel message to the UE and a notification message to the SCC AS after determining that the UE fails to establish the called voice dedicated bearer in the PS domain, and the cancel message is used to instruct the UE to select the 4G network and perform joint registration. .
  • the cancellation message or the notification message carries the indication information of the bearer resource allocation failure.
  • the method further includes:
  • the SCC AS When it is determined that the notification message carries the indication information of the failure of bearer resource allocation, the SCC AS sends a request message to a mobile switching center (Mobile Switching Center, MSC), and the request message is used to instruct the MSC to query whether the UE is registered in the CS domain;
  • MSC Mobile Switching Center
  • the step of sending the request message to the MSC is performed again after a preset time interval.
  • the SCC AS immediately performs the CS RETRY process when it is determined that the notification message carries the indication information of the bearer resource allocation failure, which ensures the timeliness of retrying the domain switching call after the called voice dedicated bearer fails to be established. .
  • the method further includes:
  • the SCC AS When it is determined that the notification message carries the indication information of the bearer resource allocation failure, the SCC AS starts a pre-configured first timer, and sends a request message to the MSC after the first timer expires.
  • the request message is used to instruct the MSC to query the UE in the CS domain. whether to register;
  • the step of sending the request message to the MSC is performed again after a preset time interval.
  • the SCC AS when it is determined that the notification message carries the indication information of the bearer resource allocation failure, the SCC AS starts a timer, that is, the first timer waits for the called UE to switch to the 4G network, so as to avoid the MSC from querying that the called UE is in the CS
  • the called UE When the domain is registered, the called UE has not yet been successfully switched to the 4G network, which reduces the number of retry attempts of the domain change call and improves the probability that the called UE is successfully routed to the CS domain.
  • the method further includes:
  • the SCC AS When it is determined that the notification message carries the indication information of the bearer resource allocation failure, the SCC AS starts a preconfigured second timer, and after the second timer expires, determines whether the UE is in an IP Multimedia Subsystem (IP Multimedia Subsystem, IMS) registration state, And query the Unified Data Manager (UDM) whether the current registration domain of the UE is a 4G network;
  • IP Multimedia Subsystem IP Multimedia Subsystem
  • UDM Unified Data Manager
  • the calling domain is determined as the PS domain, and the step of starting the preconfigured second timer is performed again.
  • the SCC AS starts a preconfigured second timer when it is determined that the notification message carries the indication information of the bearer resource allocation failure , after the second timer expires, determine whether the called UE is in the IMS registration state, and query the UDM whether the current registration domain of the called UE is a 4G network; if so, determine the calling domain as the PS domain, and execute the startup pre-configuration again
  • the step of the second timer realizes that after the called voice dedicated bearer in the 5G network fails to be established, the retry of the domain change call can still be performed, which ensures the applicable scope and reliability of the call processing method provided by the embodiment of the present application.
  • the SCC AS after the SCC AS receives the called request message of the UE, it includes:
  • the SCC AS adds a retry flag in the called request message, and the retry flag is used to indicate that the network supports the retry function of switching domain calls after the establishment of the called voice dedicated bearer fails;
  • the SCC AS sends the called request message carrying the retry identifier to the P-CSCF device.
  • the reason field carried in the reason header of the cancellation message or the notification message is a preset value, and the preset value is used for Indicates that resource allocation failed.
  • a call processing apparatus in a fourth aspect, includes at least one unit, and the at least one unit is configured to implement the call processing method provided by the first aspect or any possible implementation manner of the first aspect.
  • a call processing apparatus in a fifth aspect, includes at least one unit, and the at least one unit is configured to implement the call processing method provided by the second aspect or any possible implementation manner of the second aspect.
  • a call processing apparatus in a sixth aspect, includes at least one unit, and the at least one unit is configured to implement the call processing method provided by the third aspect or any possible implementation manner of the third aspect.
  • an embodiment of the present application provides a call processing apparatus, the apparatus comprising: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to implement the first aspect when executing the instructions or the call processing method provided by any one of the possible implementations of the first aspect.
  • embodiments of the present application provide a call processing apparatus, the apparatus comprising: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to implement the second aspect when executing the instructions or the call processing method provided by any one possible implementation manner of the second aspect.
  • embodiments of the present application provide a call processing apparatus, the apparatus comprising: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to implement the above third aspect when executing the instructions or the call processing method provided by any one of the possible implementations of the third aspect.
  • embodiments of the present application provide a computer program product, comprising computer-readable codes, or a non-volatile computer-readable storage medium carrying computer-readable codes, when the computer-readable codes are stored in an electronic
  • the processor in the electronic device executes the first aspect or the call processing method provided by any one of the possible implementations of the first aspect.
  • embodiments of the present application provide a computer program product, comprising computer-readable codes, or a non-volatile computer-readable storage medium carrying computer-readable codes, when the computer-readable codes are stored in
  • the processor in the electronic device executes the call processing method provided by the second aspect or any one of the possible implementation manners of the second aspect.
  • embodiments of the present application provide a computer program product, comprising computer-readable codes, or a non-volatile computer-readable storage medium carrying computer-readable codes, when the computer-readable codes are stored in
  • the processor in the electronic device executes the call processing method provided by the third aspect or any one of the possible implementation manners of the third aspect.
  • embodiments of the present application provide a non-volatile computer-readable storage medium on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the first aspect or the first aspect is implemented
  • the call processing method provided by any of the possible implementations.
  • embodiments of the present application provide a non-volatile computer-readable storage medium on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the second aspect or the second aspect described above is implemented.
  • the call processing method provided by any of the possible implementations.
  • embodiments of the present application provide a non-volatile computer-readable storage medium on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the third aspect or the third aspect is implemented
  • the call processing method provided by any of the possible implementations.
  • an embodiment of the present application provides a call processing system, where the system includes a P-CSCF device, a UE, and an SCC AS, where the P-CSCF device is configured to perform the first aspect or any one of the first aspects
  • the P-CSCF device is configured to perform the first aspect or any one of the first aspects
  • a call processing method provided by a possible implementation manner the UE is used to execute the second aspect or the call processing method provided by any one of the possible implementation manners of the second aspect, and the SCC AS is used to perform the third aspect or The call processing method provided by any one of the possible implementations of the third aspect.
  • FIG. 1 shows a flow chart of a method for retrying a domain switching call after a called voice dedicated bearer in a 4G network fails to be established in the related art.
  • FIG. 2 shows a flowchart of a method for retrying a domain change call after a called voice dedicated bearer in a 5G network fails to be established in the related art.
  • FIG. 3 shows a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • FIG. 4 shows a flowchart illustrating a call processing method provided by an exemplary embodiment of the present application.
  • FIG. 5 shows a flowchart illustrating a call processing method provided by another exemplary embodiment of the present application.
  • FIG. 6 shows a flowchart illustrating a call processing method provided by another exemplary embodiment of the present application.
  • FIG. 7 shows a flowchart illustrating a call processing method provided by another exemplary embodiment of the present application.
  • FIG. 8 shows a block diagram of a call processing apparatus provided by an exemplary embodiment of the present application.
  • FIG. 9 shows a block diagram of a call processing apparatus provided by another exemplary embodiment of the present application.
  • FIG. 10 shows a block diagram of a call processing apparatus provided by another exemplary embodiment of the present application.
  • FIG. 11 shows a schematic structural diagram of a P-CSCF device provided by an exemplary embodiment of the present application.
  • FIG. 12 shows a schematic structural diagram of a UE provided by an exemplary embodiment of the present application.
  • FIG. 13 shows a schematic structural diagram of an SCC AS provided by an exemplary embodiment of the present application.
  • the call-through rate of the voice service is an important indicator to measure the quality of the voice service.
  • the failure to establish the voice service for example, the failure to establish the called voice dedicated carrier.
  • the embodiments of the present application mainly relate to the process of retrying the domain switching call after the called voice dedicated bearer of the called UE fails to be established.
  • the main function points of the SCC AS entity include the called access domain selection function (Terminating Access Domain Selection, T-ADS).
  • T-ADS Terminal Access Domain Selection
  • the called UE fails to establish the called voice dedicated bearer in the PS domain (4G network or PS domain of 5G network), it can try to switch to the CS domain.
  • the flowchart of the method for retrying a domain change call after the called voice dedicated bearer fails to be established is shown in FIG. 1 .
  • UE_B registers in the 4G network, receives a called request message from UE_A, that is, an INVITE message, and UE_B replies with a 183 response message, where both the INVITE message and the 183 response message carry the Session Description Protocol (Session Description Protocol).
  • Session Description Protocol Session Description Protocol
  • the P-CSCF device initiates the called voice dedicated bearer establishment process, and after determining that the called voice dedicated bearer fails to be established, the P-CSCF device sends a 500/503 error message to the SCC AS, and simultaneously sends a 500/503 error message to the UE_B Notify the cancellation (CANCEL) message; Steps 111 to 113, the SCC AS starts the CS RETRY process, and sends an INVITE message to the MGCF device; Step 114, through the circuit-switched fallback (CS Fallback, CSFB) process to change the domain of the called UE to the CS domain.
  • CS Fallback circuit-switched fallback
  • Call retry that is, the MGCF device sends an initial address message (Initial Address Message, IAM) message to the MSC, and the MSC finds that the UE is registered in the CS domain, and then performs a domain change call to UE_B through the CSFB process. Therefore, in the 4G network, since the UE has joint registration, the called UE can be switched to the CS domain through the CS RETRY process to retry the call to improve the success rate of the call.
  • IAM Initial Address Message
  • UE_B registers in the 5G network, receives a called request message from UE_A, that is, an INVITE message, and UE_B replies with a 183 response message, wherein both the INVITE message and the 183 response message carry SDP information; steps 204 to 210 , the P-CSCF device initiates the called voice private bearer establishment process.
  • the P-CSCF device replies to the SCC AS with a 500/503 error message and notifies the UE_B of the CANCEL message; Steps 211 to 214, the SCC AS starts the CS RETRY process , send an INVITE message to the MGCF device, and the MGCF device sends an IAM message to the MSC. Step 215, the MSC finds that the UE is not registered in the CS domain, and directly returns a 404 error code. After the SCC AS receives the 404 error code, it ends the current called process.
  • the related technology only distinguishes between the PS domain and the CS domain. If the UE receives the called request when registering in the 5G network and the called voice dedicated bearer in the PS domain fails to be established, it will switch domains to the CS domain by starting the CS RETRY process. Retry. However, the UE does not have a joint registration mechanism in 5G, and the UE is still registered in the 5G network after the called voice dedicated carrier fails to be established. The CS RETRY process started cannot be paged to the UE, and the UE also loses the opportunity for the called party to retry, thus reducing the The voice call pass rate of the UE.
  • VONR can also reuse the CS RETRY mechanism of SCC AS, it will improve the voice call pass rate of the user equipment.
  • the present application provides a call processing method, device and storage medium. During a call in a 5G network, when the calling UE fails to initiate a call to the called UE through VONR, the network can use other voice solutions to initiate a call to the called UE again. In this way, the connection rate of the call initiated by the calling UE to the called UE can be improved, the call demand of the user can be met, and the call experience of the user can be guaranteed.
  • the technical solution of the present application may be applied to a fifth-generation mobile communication technology (5th-Generation, 5G) system, and may also be a next-generation mobile communication technology system of 5G.
  • 5G fifth-generation mobile communication technology
  • This embodiment of the present application does not limit this.
  • the following description only takes the above communication system as a 5G system as an example.
  • FIG. 3 shows a schematic structural diagram of a communication system 30 provided by an embodiment of the present application.
  • the communication system 30 includes: an operation support layer 310 , a service layer 320 , a core network layer 330 , an access layer 340 and a terminal layer 350 .
  • the operation support layer 310 includes some network elements related to network element management and billing support.
  • the operation support layer 310 may include network elements such as a slicing packet network (Slicing Packet Network, SPN), a charging collection function (Charging Collecting Function, CCF), and a network element management system (Element Management System, EMS).
  • SPN slicing Packet Network
  • CCF Charging Collecting Function
  • EMS Network element management system
  • the business layer 320 includes the SCC AS 322.
  • the main function points of SCC AS322 include T-ADS. After the called UE fails to establish the called voice dedicated bearer in the PS domain, it can try to switch to the CS domain.
  • the core network layer 330 includes a Policy Control Function (PCF) device 331, a Serving-Call Session Control Function (S-CSCF) device 332, a Proxy-Call Session Control Function (Proxy-Call Session Control Function) , P-CSCF) device 333, and a multimedia gateway control function (Multimedia Gateway Control Function, MGCF) device 334.
  • PCF Policy Control Function
  • S-CSCF Serving-Call Session Control Function
  • P-CSCF Proxy-Call Session Control Function
  • MGCF Multimedia Gateway Control Function
  • PCF device 331 supports a unified policy framework to manage network behavior, and provides access and mobility management-related policies to an access and mobility management entity (Access and Mobility Management Function, AMF).
  • AMF Access and Mobility Management Function
  • S-CSCF device 332 is the core of IIMS, it is located in the home network, and performs session control and registration request for the UE, but when the UE is in a session, the S-CSCF device handles the session state in the network. There may be multiple S-CSCF devices 332 in the same operator's network.
  • P-CSCF device 333 is the first point of contact (at the signaling plane) for the user in the IMS, and from a SIP perspective, it is an outbound/inbound SIP proxy server, all SIP signaling, regardless of Whether it is from the UE or sent to the UE, it must pass through the P-CSCF device 333 .
  • the UE can obtain the address of the P-CSCF device 333 using the local CSCF discovery mechanism.
  • the P-CSCF device 333 is responsible for validating the request, forwarding it to the designated target, and processing and forwarding the response.
  • MGCF device 334 is an integral part of the IMS, communicates with the CSCF and controls the connection of the media channel in an IMS-MGW.
  • the MGCF equipment 334 is used to perform protocol conversion between the ISDN user part, ie ISUP and the IMS pager control protocol.
  • the core network layer 330 may further include/gateway mobile switching center (Gateway Mobile Switching Center, GMSC), MSC, and visitor location register (Visitor Location Register, VLR).
  • GMSC Gateway Mobile Switching Center
  • MSC Mobility Management Entity Center
  • VLR Visitor Location Register
  • the access layer 340 includes a mobility management node (Mobility Management Entity, MME).
  • MME mobility management node
  • the MME is the key control node of the LTE access network and is responsible for the signaling processing part.
  • the MME is responsible for the positioning and paging procedures of the UE in the idle mode.
  • the operation support layer 310 , the service layer 320 , the core network layer 330 and the access layer 340 include but are not limited to the above network elements. This embodiment is only illustratively enumerated, and is not limited thereto.
  • the terminal layer 350 includes one or more UEs.
  • the UE may be a mobile terminal device, for example, the UE is a mobile phone (or a "cellular" phone) or a computer with a mobile terminal device; illustratively, the UE is portable, pocket-sized, hand-held, computer built-in or vehicle-mounted mobile device.
  • the UE in this embodiment of the present application may be referred to as a subscriber unit (Subscriber Unit), a subscriber station (Subscriber Station), a mobile station (Mobile Station), a mobile station (Mobile), a remote station (Remote Station) ), Access Point, Remote Terminal, Access Terminal, User Terminal, User Agent, and User Device.
  • the UE may also be a relay (Relay) device, which is not limited in this embodiment.
  • the above-mentioned network elements may have different names in the next-generation mobile communication technology system of 5G, but have the same or similar names. function, which is not limited in this embodiment of the present application.
  • FIG. 4 shows a flowchart of a call processing method provided by an exemplary embodiment of the present application, and the method is used in the communication system 30 shown in FIG. 3 .
  • the method includes the following steps.
  • Step 401 the P-CSCF device receives a called request message from a called UE, where the called UE is a called terminal registered in the 5G network.
  • a call refers to a process in which one terminal initiates an audio and video call request to another terminal.
  • One terminal that initiates the call is the calling terminal, and the other terminal that receives the call is the called terminal.
  • the calling terminal and the called terminal can talk, that is, multimedia data such as voice and video can be transmitted between the calling terminal and the called terminal, so as to provide voice, video, etc. for users at both ends.
  • multimedia business For the convenience of description, the following only takes the calling terminal as the calling UE and the called terminal as the called UE as an example for description.
  • the called UE is a called terminal registered in the 5G network, that is, the called UE is a called terminal attached and registered in the 5G network.
  • the P-CSCF device After receiving the called request message of the called UE, the P-CSCF device forwards the called request message to the called UE.
  • the called UE receives the called request message sent by the P-CSCF device.
  • the called request message is a message for requesting to establish an IMS voice service.
  • the P-CSCF device is a network element in the IMS network.
  • the called request message is an INVITE message
  • the INVITE message carries SDP information.
  • Step 402 the P-CSCF device determines that the called UE fails to establish the called voice dedicated bearer in the PS domain.
  • the P-CSCF device initiates the process of establishing the called voice dedicated bearer, and after determining that the called UE dedicated voice bearer establishment in the PS domain fails, step 403 is performed.
  • the PS domain is a PS domain of a 4G network or a 5G network.
  • the failure to establish the called voice dedicated carrier means that the calling terminal fails to make a call to the called terminal.
  • the failure of the called voice dedicated bearer establishment includes the failure caused by the conflict between the called voice dedicated bearer establishment and handover.
  • the embodiment of the present application does not limit the situation that the called voice dedicated carrier fails to be established.
  • Step 403 the P-CSCF device sends a cancel message to the called UE.
  • the P-CSCF device sends a cancel message to the called UE after determining that the called UE fails to establish the called voice dedicated bearer in the PS domain.
  • the called UE is a called terminal registered in the 5G network, and the cancel message is used to instruct the called UE to select the 4G network and perform joint registration.
  • Step 404 after receiving the cancellation message sent by the P-CSCF device, the called UE selects the 4G network and performs joint registration.
  • the cancellation message is used to instruct the called UE to select the 4G network and perform joint registration, then the called UE selects the 4G network and performs joint registration. After successfully registering on the 4G network, wait for the CS RETRY process of the network. Among them, joint registration may also be called joint attachment.
  • the called UE selects the 4G network and performs joint registration, including: the called UE selects the 4G network to perform a Tracking Area Update (TAU) process, and registers with the 4G network for a preset duration.
  • TAU Tracking Area Update
  • the preset duration is 5s. This embodiment of the present application does not limit this.
  • the P-CSCF device after determining that the called UE registered in the 5G network fails to establish the called voice dedicated bearer in the PS domain, the P-CSCF device sends a cancel message to the called UE to indicate the called UE.
  • the UE selects the 4G network and performs joint registration; it avoids the situation that the called UE is still registered in the 5G network after the called voice dedicated load fails to be established in the related art, and the CS RETRY process started cannot be paged to the called UE.
  • the called UE can be instructed to select the 4G network and perform joint registration through the cancellation message, so as to cooperate with the CS RETRY process of the network to initiate a call to the called UE again, which can improve the calling efficiency.
  • FIG. 5 shows a flowchart of a call processing method provided by an exemplary embodiment of the present application, and the method is used in the communication system 30 shown in FIG. 3 .
  • the method includes the following steps.
  • Step 501 the calling UE sends a called request message to the P-CSCF device.
  • the called request message is used to request the establishment of the IMS voice service.
  • the called request message carries SDP information.
  • the calling UE is in a cell of the 5G network
  • the called request message is a message for requesting to establish an IMS voice service in the PS domain for the calling UE of the 5G network.
  • Step 502 the P-CSCF device forwards the called request message to the called UE.
  • the P-CSCF device receives the called request message sent by the calling UE, and the P-CSCF device connects the call request to the called UE through the called request message.
  • the called request message carries SDP information.
  • Step 503 the called UE returns a 183 response message to the P-CSCF device.
  • the called UE receives the called request message sent by the P-CSCF device, and the called UE returns a 183 response message, which carries the media type and media codec capability after the negotiation is completed in the SDP information.
  • Step 504 the P-CSCF device sends an authentication authorization request (authentication authorization request, AAR) message to the PCF device.
  • authentication authorization request authentication authorization request, AAR
  • the AAR message is used to notify the PCF device to establish a dedicated voice bearer.
  • the AAR message carries the user identity, the IMS application layer charging identity, and the media description information of the IMS voice service, and the media description information includes at least one of the following information: classifier identity, bandwidth requirement description information, media type description information, and QoS parameters.
  • the P-CSCF device may directly send the AAR message to the PCF device, or may send the AAR message to the PCF device after receiving the 183 response message.
  • the 183 response message is a response message made by the called UE after the called request message of the calling UE is forwarded to the called UE, which can be sent to the PCF device via the called IMS network and the calling IMS network.
  • Step 505 the PCF device returns an Authentication, Authorization and Accounting (AAA) message to the P-CSCF device.
  • AAA Authentication, Authorization and Accounting
  • the AAA message carries the user location information returned by the PCF device.
  • Step 506 the PCF device sends a RAR (Re-Auth-Request) message to the P-CSCF device.
  • RAR Re-Auth-Request
  • the PCF device performs bearer binding of the call session and the corresponding IP-CAN session by checking the call service, generates QoS rules, and sends it to the P-CSCF device through the RAR message.
  • Step 507 After receiving the RAR message, the P-CSCF device returns an RAA (Re-Auth-Answer) message to the PCF device.
  • RAA Re-Auth-Answer
  • the P-CSCF device returns the RAA message to the PCF device, and then establishes the voice dedicated bearer.
  • Step 508 the P-CSCF device determines that the called UE fails to establish the called voice dedicated bearer in the PS domain.
  • the P-CSCF device initiates a dedicated carrier establishment process, and after the establishment fails, step 509 is performed.
  • Step 509 the P-CSCF device sends a cancel message to the called UE, where the cancel message is used to instruct the called UE to select the 4G network and perform joint registration.
  • the cancellation message carries the indication information of the bearer resource allocation failure.
  • the reason field carried in the reason header of the cancellation message is a preset value, and the preset value is used to indicate that the resource allocation fails.
  • the preset value of the cause field in the embodiment of the present application is a cause value "3”
  • the cause value "3" is an indication of a resource allocation failure, that is, the cause value "3” is used to perform a call between the called UE and the SCC CAS. synchronization between.
  • the embodiment of the present application does not limit the setting manner of the preset value of the reason field.
  • Step 510 the P-CSCF device sends a notification message to the SCC AS, where the notification message is used to instruct the SCC AS to perform a domain switch to call the called UE.
  • the P-CSCF device sends a notification message to the SCC AS after determining that the called UE fails to establish the called voice dedicated bearer in the PS domain.
  • the notification message is used to instruct the SCC AS to perform domain switching to call the UE, that is, the notification message is used to instruct the SCC AS to switch domains to the CS domain through the CSFB process to retry the call.
  • the notification message includes a 500/503 error message.
  • the notification message carries indication information that bearer resource allocation fails.
  • the cause field carried in the cause header of the notification message is a preset value, and the preset value is used to indicate resource allocation failure.
  • the default value is the cause value "3".
  • step 509 and step 510 may be executed in parallel, or step 509 may be executed first and then step 510 may be executed, or step 510 may be executed first and then step 509.
  • the embodiment of the present application does not limit the execution order of step 509 and step 510.
  • Step 511 when the cancellation message carries the indication information that the bearer resource allocation fails, the called UE selects the 4G network and performs joint registration.
  • the called UE is registered in the 5G network. After receiving the cancellation message sent by the P-CSCF device, the called UE determines whether the cancellation message carries the indication information of the bearer resource allocation failure. If the cancellation message carries the bearer resource allocation failure indication information, the called UE selects the 4G network and performs joint registration. After successfully registering on the 4G network, wait for the CS RETRY process of the network.
  • the called UE determines whether the reason field carried in the reason header of the cancellation message is a preset value, if the reason field carried in the reason header of the cancellation message is a predetermined value. If the value is set, the called UE selects the 4G network and performs joint registration.
  • a third timer is started. After the third timer expires, if the CS Paging (PAGING) message of the network is not received, the called UE The UE registers to the 5G network again.
  • PAGING CS Paging
  • the third timer is pre-configured, for example, the timing duration of the third timer is set to 5s. This embodiment of the present application does not limit the setting manner of the third timer.
  • the called UE when the called UE receives the called request message, if the network does not configure the inter-system measurement, the called UE autonomously performs the inter-system measurement, so as to speed up this step in the network selection process.
  • Step 512 when the notification message carries the indication information of the bearer resource allocation failure, the SCC AS performs a domain switch call to the called UE.
  • the SCC AS After receiving the notification message sent by the P-CSCF device, the SCC AS determines whether the notification message carries the indication information of the failure of bearer resource allocation. Call the UE, that is, the SCC AS changes the domain to the CS domain through the CSFB process to retry the call.
  • the SCC AS determines whether the cause field carried in the cause header of the notification message is a preset value, if the cause field carried in the cause header of the notification message is a preset value. value, the SCC AS performs a domain switch to call the called UE.
  • the SCC AS performs a domain switch to call the called UE.
  • the SCC AS performs the process of switching domains to call the called UE, including but not limited to the following two possible implementations.
  • the SCC AS when it is determined that the notification message carries the indication information of the bearer resource allocation failure, the SCC AS sends a request message to the MSC, and the request message is used to instruct the MSC to query whether the called UE is registered in the circuit-switched CS domain;
  • the SCC AS receives the cause value indicating that the called UE is not registered in the CS domain, the step of sending the request message to the MSC is performed again after a preset time interval.
  • the SCC AS when the cause field carried in the cause header of the notification message is a preset value, and the called UE is registered in the 5G network, the SCC AS immediately performs the CS RETRY process, that is, the SCC AS transmits the called request message to the MSC, The called request message is used to instruct the MSC to inquire whether the called UE is registered in the CS domain; when the SCC AS receives the cause value indicating that the called UE is not registered in the CS domain, it will execute the called UE again after a preset time interval. Steps in which the request message is transmitted to the MSC.
  • the SCC AS sends the called request message to the S-CSCF device, the S-CSCF device sends the called request message to the MGCF device, and the MGCF device sends the called request message to the MSC.
  • the SCC AS transmits the called request message to the MSC through the MGCF device, and the MSC queries whether the called UE is registered in the CS domain. If the called UE is not registered in the CS domain, the MSC returns to indicate that the called UE is in the CS domain. Unregistered Reason value to SCC AS.
  • the SCC AS performs the step of transmitting the called request message to the MSC again after a preset time interval.
  • the cause value for indicating that the called UE is not registered in the CS domain is the 404 cause value
  • the preset time interval is 2s. This embodiment of the present application does not limit this.
  • the MSC performs the CSFB procedure after paging the called UE, so that the called UE is routed to the CS domain, and the CS call is established.
  • the number of attempts of the SCC AS to perform the step of transmitting the called request message to the MSC again after a preset time interval can be dynamically configured.
  • the number of attempts is configured as 3. This embodiment of the present application does not limit this.
  • the SCC AS when it is determined that the notification message carries the indication information of the bearer resource allocation failure, the SCC AS starts a preconfigured first timer, and sends a request message to the MSC after the first timer expires to request The message is used to instruct the MSC to inquire whether the called UE is registered in the CS domain; when the SCC AS receives the cause value indicating that the called UE is not registered in the CS domain, it executes the process of sending the request message to the MSC again after a preset time interval. step.
  • the SCC AS starts a timer to wait for the called UE to select a network and register in the 4G network.
  • the timer can be dynamically configuration. That is, the SCC AS starts the preconfigured first timer, and transmits the called request message to the MSC after the first timer expires.
  • the called request message is used to instruct the MSC to query whether the UE is registered in the CS domain;
  • the step of transmitting the called request message to the MSC is performed again after a preset time interval.
  • the first timer is pre-configured, for example, the timing duration of the first timer is 3s. This embodiment of the present application does not limit this.
  • the MSC performs the CSFB procedure after paging the called UE, so that the called UE is routed to the CS domain, and the CS call is established.
  • the SCC AS transmits the called request message to the MSC, and when the SCC AS receives the cause value indicating that the called UE is not registered in the CS domain, the SCC AS returns the call request message after a preset time interval.
  • the step of transmitting the called request message to the MSC is performed, and the relevant details may refer to the relevant description in the first possible implementation manner, which will not be repeated here.
  • the P-CSCF device when the called UE is registered in the 5G network, after the P-CSCF device determines that the called UE's called voice dedicated bearer in the PS domain fails to be established, the P-CSCF device sends the The called UE sends a cancel message and a notification message to the SCC AS.
  • the cancel message indicates that the called UE selects the 4G network and performs joint registration.
  • /4G fallback EPS FALLBACK, EPSFB
  • the called UE and the SCC AS After the called fails, the called UE and the SCC AS perform the CS RETRY process synchronously, which further improves the voice call pass rate of the called UE.
  • the cancellation message or the notification message carries the indication information of the bearer resource allocation failure
  • the indication information of the bearer resource allocation failure is used to instruct the called UE or the SCC AS to perform corresponding operations, ensuring that the P-CSCF device can clearly Indicates the called UE or the SCC AS, which ensures the reliability of the subsequent retry of the domain change call.
  • the SCC AS sends a request message to the MSC when it is determined that the notification message carries the indication information of the bearer resource allocation failure, and the request message is used to instruct the MSC to query whether the called UE is registered in the CS domain; when the SCC AS receives the It is used to indicate the reason value that the called UE is not registered in the CS domain, and execute the step of sending the request message to the MSC again after a preset time interval; that is, when it is determined that the notification message carries the indication information of the bearer resource allocation failure, the SCC AS Immediately carry out the CS RETRY process to ensure the timeliness of retrying the domain switching call after the called voice dedicated bearer fails to be established.
  • the SCC AS when it is determined that the notification message carries the indication information of the bearer resource allocation failure, the SCC AS starts a preconfigured first timer, and sends a request message to the MSC after the first timer expires, and the request message is used to indicate
  • the MSC queries whether the called UE is registered in the CS domain; when the SCC AS receives the cause value indicating that the called UE is not registered in the CS domain, it executes the step of sending the request message to the MSC again after a preset time interval;
  • the SCC AS starts a timer to wait for the called UE to switch to the 4G network, so as to prevent the MSC from querying whether the called UE is registered in the CS domain and the called UE has not yet successfully switched to the 4G network. In the case of , it reduces the number of attempts to retry the domain change call, and increases the probability that the called UE is successfully routed to
  • the above step 512 can be The replacement implementation becomes the following steps, as shown in Figure 6:
  • Step 601 when it is determined that the notification message carries the indication information of the bearer resource allocation failure, the SCC AS starts a preconfigured second timer.
  • the SCC AS starts a second timer.
  • the SCC AS receives the notification message sent by the P-CSCF device; determines whether the cause field carried in the cause header of the notification message is a preset value, and the preset value is used to indicate resource allocation failure; if the cause field carried in the cause header of the notification message is is the default value and the called and called UEs are registered in the 5G network, the SCC AS starts the second timer.
  • the second timer is preconfigured, for example, the timing duration of the second timer is 3s. This embodiment of the present application does not limit this.
  • Step 602 after the second timer expires, determine whether the called UE is in the IMS registration state, and query the UDM whether the current registration domain of the called UE is the 4G network.
  • the SCC AS judges whether the called UE is in the IMS registration state, and queries the UDM whether the current registration domain of the called UE is the 4G network. If the called UE is in the IMS registration state and the current registration domain of the called UE is the 4G network, go to step 603; if the called UE is not in the IMS registration state, or the current registration domain of the called UE is not the 4G network, end the current called UE. called process.
  • Step 603 when the called UE is in the IMS registration state and the current registration domain of the called UE is the 4G network, the calling domain is determined as the PS domain, and the step of starting the preconfigured second timer is performed again.
  • the SCC AS determines the calling domain as the PS domain, and executes the step of starting the preconfigured second timer again.
  • the number of attempts by the SCC AS to start the second timer can be dynamically configured.
  • the number of attempts is configured as 3. This embodiment of the present application does not limit this.
  • the embodiment of the present application also enables the SCC CAS to start the pre-configured configuration when it is determined that the notification message carries the indication information of the failure of bearer resource allocation.
  • the second timer determines whether the called UE is in the IMS registration state after the second timer expires, and queries the UDM whether the current registration domain of the called UE is a 4G network;
  • the step of starting the preconfigured second timer is executed; it is realized that after the establishment of the called voice dedicated bearer of the 5G network fails, the retry of the domain change call can still be executed, which ensures the application scope of the call processing method provided by the embodiment of the present application and reliability.
  • the CS RETRY function of some operators may be turned off.
  • the called UE initiates the action of selecting the 4G network after receiving the cancellation message, the called UE cannot be registered on the 4G network. Therefore, in a possible implementation manner, as shown in FIG. 7 , the above steps 501 and 502 can be replaced and implemented into the following steps:
  • Step 701 the calling UE sends a called request message to the S-CSCF device.
  • the calling UE sends the called request message to the S-CSCF device, and the S-CSCF device receives the called request message.
  • Step 702 the S-CSCF device sends the called request message to the SCC AS.
  • the S-CSCF device After receiving the called request message sent by the calling UE, the S-CSCF device sends the called request message to the SCC AS.
  • Step 703 the SCC AS sends the called request message carrying the retry identifier to the P-CSCF device.
  • the SCC AS After receiving the called request message, the SCC AS adds a retry flag to the called request message.
  • the retry flag is used to instruct the network to support the retry function of switching domain calls after the establishment of the called voice dedicated bearer fails;
  • the called request message of the try identification is sent to the P-CSCF device.
  • the SCC AS adds a retry identifier in the support field of the header field of the called request message, for example, the retry identifier is mt-retry.
  • the retry identifier is mt-retry. This embodiment of the present application does not limit this.
  • Step 704 the P-CSCF device sends the called request message carrying the retry identifier to the called UE.
  • the P-CSCF device receives the called request message of the called UE sent by the SCC AS, and the called request message carries the retry identifier; the P-CSCF device sends the called request message carrying the retry identifier to the called UE.
  • the called UE receives the called request message carrying the retry identifier sent by the P-CSCF device, and the retry identifier is used to instruct the network to support the retry function of switching domain calls after the establishment of the called voice dedicated bearer fails.
  • step 511 can be replaced by the following steps:
  • Step 711 when the cancellation message carries the indication information of the failure of bearer resource allocation, and it is determined that the network supports the retry function of switching domain calls after the establishment of the called voice dedicated bearer fails, the called UE selects the 4G network and performs joint registration.
  • the called UE is registered in the 5G network, and after receiving the cancellation message sent by the P-CSCF device, the called UE judges whether the reason field carried in the reason header of the cancellation message is a preset value, and judges whether the network supports The function of retrying the call after the called party's voice-only bearer establishment fails. Illustratively, it is judged whether the network supports the retry function of switching domain calls after the establishment of the called voice dedicated bearer fails, that is, it is judged whether a retry identifier is received.
  • the called UE selects the 4G network and performs joint registration. After successfully registering on the 4G network, wait for the CS RETRY process of the network.
  • the embodiment of the present application also adds a retry identifier to the called request message through the SCC AS after receiving the called request message, and notifies the called UE network.
  • the network supports the retry function of switching domain call after the called voice dedicated bearer fails to be established, and can support the subsequent steps that the called UE selects the 4G network and performs joint registration, which further ensures the call processing method provided by the embodiment of the present application. Scope and reliability.
  • FIG. 8 shows a block diagram of a call processing apparatus provided by an exemplary embodiment of the present application.
  • the call processing apparatus can be implemented by software, hardware or a combination of the two to become all or a part of the P-CSCF device in the communication system 30 shown in FIG. 3 .
  • the call processing apparatus may include: a receiving unit 810 , a processing unit 820 and a sending unit 830 .
  • a receiving unit 810 configured to implement the function of the above step 401 and the receiving function of the P-CSCF device side implicit in each step;
  • a processing unit 820 configured to implement the functions of the above steps 402 and 508 and the processing functions of the P-CSCF device side implicit in each step;
  • the sending unit 830 is configured to implement the functions of the above steps 403 , 502 , 504 , 507 , 509 and 510 and the sending function on the side of the P-CSCF device implicit in each step.
  • FIG. 9 shows a block diagram of a call processing apparatus provided by another exemplary embodiment of the present application.
  • the call processing apparatus can be implemented by software, hardware or a combination of the two to become all or a part of the UE in the terminal layer of the communication system 30 shown in FIG. 3 , and the UE is the called terminal registered in the 5G network.
  • the call processing apparatus may include: a receiving unit 910 , a processing unit 920 and a sending unit 930 .
  • a receiving unit 910 configured to realize the above-mentioned function of receiving the called request message sent by the P-CSCF device and the receiving function on the called UE side implicit in each step;
  • a processing unit 920 configured to implement the functions of the above steps 404 and 511 and the processing functions of the called UE side implicit in each step;
  • the sending unit 930 is configured to implement the functions of the above steps 503 and 711 and the sending function on the called UE side implicit in each step.
  • FIG. 10 shows a block diagram of a call processing apparatus provided by another exemplary embodiment of the present application.
  • the call processing apparatus can be implemented by software, hardware or a combination of the two to become all or a part of the SCC AS in the communication system 30 shown in FIG. 3 .
  • the call processing apparatus may include: a receiving unit 1010 , a processing unit 1020 and a sending unit 1030 .
  • the receiving unit 1010 is used to realize the above-mentioned function of receiving the called request message of the called UE and the receiving function of the SCC AS side implicit in each step;
  • the processing unit 1020 is used to realize the functions of the above steps 512, 601, 602, and 603 and the processing functions of the SCC AS side implicit in each step;
  • the sending unit 1030 is configured to realize the function of the above step 703 and the sending function of the SCC AS side implicit in each step.
  • FIG. 11 shows a schematic structural diagram of a P-CSCF device provided by an exemplary embodiment of the present application.
  • the P-CSCF device may be the P-CSCF device in the communication system 30 shown in FIG. 3 .
  • the P-CSCF device includes: a processor 111 , a receiver 112 , a transmitter 113 , a memory 114 and a bus 115 .
  • the processor 111 includes one or more processing cores, and the processor 111 executes various functional applications and information processing by running software programs and modules.
  • the receiver 112 and the transmitter 113 may be implemented as a communication component, which may be a communication chip, and the communication chip may include a receiving module, a transmitting module, a modulation and demodulation module, etc., for modulating and/or demodulating information. tune and receive or transmit that information via wireless signals.
  • the memory 114 is connected to the processor 111 through the bus 115 .
  • the memory 114 stores program instructions and data necessary for the P-CSCF device.
  • the processor 111 is configured to execute the program instructions and data in the memory 114 to implement the functions of each step performed by the P-CSCF device in each method embodiment of the present application.
  • the processor 111 controls the receiver 112 to implement the receiving function on the P-CSCF device side in the above steps by running at least one program instruction in the memory 114; the processor 111 controls the transmitter by running at least one program instruction in the memory 114 113 to implement the sending function on the P-CSCF device side in each of the above steps.
  • memory 114 may be implemented by any type of volatile or non-volatile storage device or combination thereof, such as static anytime access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable Except programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.
  • SRAM static anytime access memory
  • EEPROM electrically erasable programmable read only memory
  • EPROM erasable except programmable read only memory
  • PROM programmable read only memory
  • ROM read only memory
  • magnetic memory flash memory
  • flash memory magnetic disk or optical disk.
  • FIG. 11 only shows a simplified design of the P-CSCF device.
  • the P-CSCF device may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all P-CSCF devices that can implement the present application are included in the present application. within the scope of protection.
  • FIG. 12 shows a schematic structural diagram of a UE provided by an exemplary embodiment of the present application.
  • the UE may be a UE in the terminal layer of the communication system 30 shown in FIG. 3 , and the UE is registered in a 5G network.
  • the called terminal in is the called UE.
  • the UE includes: a processor 121 , a receiver 122 , a transmitter 123 , a memory 124 and a bus 125 .
  • the processor 121 includes one or more processing cores, and the processor 121 executes various functional applications and information processing by running software programs and modules.
  • the receiver 122 and the transmitter 123 may be implemented as a communication component, which may be a communication chip, and the communication chip may include a receiving module, a transmitting module, a modulation and demodulation module, etc., for modulating and/or demodulating information. tune and receive or transmit that information via wireless signals.
  • the memory 124 is connected to the processor 121 through the bus 125 .
  • the memory 124 stores necessary program instructions and data for the UE.
  • the processor 121 is configured to execute the program instructions and data in the memory 124 to implement the functions of each step performed by the UE in each method embodiment of the present application.
  • the processor 121 controls the receiver 122 to implement the receiving function on the called UE side in the above steps by running at least one program instruction in the memory 124; the processor 121 controls the transmitter 123 by running at least one program instruction in the memory 124. to implement the sending function on the called UE side in the above steps.
  • memory 124 may be implemented by any type of volatile or non-volatile storage device or combination thereof, such as static anytime access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable Except programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
  • SRAM static anytime access memory
  • EEPROM electrically erasable programmable read only memory
  • EPROM erasable except programmable read only memory
  • PROM programmable read only memory
  • ROM read only memory
  • magnetic memory magnetic memory
  • flash memory magnetic or optical disk.
  • FIG. 12 only shows a simplified design of the UE.
  • the UE may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all UEs that can implement the present application are within the protection scope of the present application.
  • FIG. 13 shows a schematic structural diagram of an SCC AS provided by an exemplary embodiment of the present application, and the SCC AS may be the SCC AS in the communication system 30 shown in FIG. 3 .
  • the SCC AS includes: a processor 131 , a receiver 132 , a transmitter 133 , a memory 134 and a bus 135 .
  • the processor 131 includes one or more processing cores, and the processor 131 executes various functional applications and information processing by running software programs and modules.
  • the receiver 132 and the transmitter 133 may be implemented as a communication component, which may be a communication chip, and the communication chip may include a receiving module, a transmitting module, a modulation and demodulation module, etc., for modulating and/or demodulating information. tune and receive or transmit that information via wireless signals.
  • the memory 134 is connected to the processor 131 through the bus 135 .
  • the memory 134 stores program instructions and data necessary for the SCC AS.
  • the processor 131 is configured to execute the program instructions and data in the memory 134 to realize the functions of each step performed by the SCC AS in each method embodiment of the present application.
  • the processor 131 controls the receiver 132 to realize the receiving function on the SCC AS side in the above steps by running at least one program instruction in the memory 134; Realize the sending function of the SCC AS side in the above steps.
  • memory 134 may be implemented by any type of volatile or non-volatile storage device or combination thereof, such as static anytime access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable Except programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
  • SRAM static anytime access memory
  • EEPROM electrically erasable programmable read only memory
  • EPROM erasable except programmable read only memory
  • PROM programmable read only memory
  • ROM read only memory
  • magnetic memory magnetic memory
  • flash memory magnetic or optical disk.
  • Figure 13 only shows a simplified design of the SCC AS.
  • the SCC AS may contain any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all SCC ASs that can implement the present application are within the protection scope of the present application .
  • Embodiments of the present application provide a call processing apparatus, the apparatus comprising: a processor and a memory for storing instructions executable by the processor; wherein the processor is configured to implement the above method when executing the instructions.
  • Embodiments of the present application provide a computer program product, including computer-readable codes, or a non-volatile computer-readable storage medium carrying computer-readable codes, when the computer-readable codes are executed in a processor of an electronic device , the processor in the electronic device executes the above method.
  • An embodiment of the present application provides a call processing system, the system includes a P-CSCF device, a UE, and an SCC AS, the P-CSCF device includes the call processing apparatus shown in FIG. 8 , and the UE includes the call processing apparatus shown in FIG. 9 .
  • the SCC AS includes the call processing device shown in FIG. 10 ; or, the P-CSCF device includes the P-CSCF device shown in FIG. 11 , the UE includes the UE shown in FIG. 12 , the The SCC AS includes the SCC AS shown in FIG. 13 .
  • Embodiments of the present application provide a non-volatile computer-readable storage medium on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the foregoing method is implemented.
  • a computer-readable storage medium may be a tangible device that can hold and store instructions for use by the instruction execution device.
  • the computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing.
  • Computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read-only memory (Electrically Programmable Read-Only-Memory, EPROM or flash memory), static random access memory (Static Random-Access Memory, SRAM), portable compact disk read-only memory (Compact Disc Read-Only Memory, CD - ROM), Digital Video Disc (DVD), memory sticks, floppy disks, mechanically encoded devices, such as punch cards or raised structures in grooves on which instructions are stored, and any suitable combination of the foregoing .
  • RAM random access memory
  • ROM read only memory
  • EPROM erasable programmable read-only memory
  • EPROM Errically Programmable Read-Only-Memory
  • SRAM static random access memory
  • portable compact disk read-only memory Compact Disc Read-Only Memory
  • CD - ROM Compact Disc Read-Only Memory
  • DVD Digital Video Disc
  • memory sticks floppy disks
  • the computer readable program instructions or code described herein can be downloaded to various computing/processing devices from a computer readable storage medium, or to an external computer or external storage device over a network, such as the Internet, a local area network, a wide area network, and/or a wireless network.
  • the network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and/or edge servers.
  • a network adapter card or network interface in each computing/processing device receives computer-readable program instructions from a network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing/processing device .
  • the computer program instructions used to perform the operations of the present application may be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or in one or more source or object code written in any combination of programming languages, including object-oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages.
  • the computer readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server implement.
  • the remote computer can be connected to the user's computer through any kind of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or, can be connected to an external computer (e.g. use an internet service provider to connect via the internet).
  • electronic circuits such as programmable logic circuits, Field-Programmable Gate Arrays (FPGA), or Programmable Logic Arrays (Programmable Logic Arrays), are personalized by utilizing state information of computer-readable program instructions.
  • Logic Array, PLA the electronic circuit can execute computer readable program instructions to implement various aspects of the present application.
  • These computer readable program instructions may be provided to a processor of a general purpose computer, special purpose computer or other programmable data processing apparatus to produce a machine that causes the instructions when executed by the processor of the computer or other programmable data processing apparatus , resulting in means for implementing the functions/acts specified in one or more blocks of the flowchart and/or block diagrams.
  • These computer readable program instructions can also be stored in a computer readable storage medium, these instructions cause a computer, programmable data processing apparatus and/or other equipment to operate in a specific manner, so that the computer readable medium storing the instructions includes An article of manufacture comprising instructions for implementing various aspects of the functions/acts specified in one or more blocks of the flowchart and/or block diagrams.
  • Computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other equipment to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other equipment to produce a computer-implemented process , thereby causing instructions executing on a computer, other programmable data processing apparatus, or other device to implement the functions/acts specified in one or more blocks of the flowcharts and/or block diagrams.
  • each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more functions for implementing the specified logical function(s) executable instructions.
  • the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
  • each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations can be implemented in hardware (eg, circuits or ASICs (Application) that perform the corresponding functions or actions. Specific Integrated Circuit, application-specific integrated circuit)), or can be implemented by a combination of hardware and software, such as firmware.

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Abstract

本申请涉及通信技术领域，尤其涉及一种呼叫处理方法、装置及存储介质。所述方法包括：P-CSCF设备接收UE的被叫请求消息，UE为注册在5G网络中的被叫终端；P-CSCF设备确定UE在PS域的被叫语音专载建立失败；P-CSCF设备向UE发送取消消息，取消消息用于指示UE选到4G网络并进行联合注册。本申请实施例通过在5G网络的呼叫过程中，在被叫失败后可通过取消消息指示被叫终端即被叫UE选到4G网络并进行联合注册，以便配合网络的CS RETRY流程再次向该被叫UE发起呼叫，避免了相关技术中被叫语音专载建立失败后被叫UE仍然注册在5G网络，启动的CS RETRY流程无法寻呼到被叫UE的情况，提高了5G网络中被叫UE的语音呼通率。

Description

呼叫处理方法、装置及存储介质
本申请要求于2020年10月23日提交中国专利局、申请号为202011149979.0、申请名称为“呼叫处理方法、装置及存储介质”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种呼叫处理方法、装置及存储介质。
背景技术
长期演进(Long Term Evolution，LTE)网络是分组交换(Packet Switched，PS)网络，不支持语音通话等电路交换(Circuit Switched，CS)业务，而现阶段中语音通话仍是一种不可或缺的重要通信业务。
为此，相关技术中往往使用CS网络中的2G/3G网络与LTE网络重叠覆盖服务区域，使用LTE网络为用户设备(User Equipment，UE)提供PS网络业务，在该UE接收到CS网络的寻呼消息，需要执行语音通话业务或其它CS网络的业务时，通过启动CS重试(RETRY)流程重定向到2G/3G网络中执行该业务，并在业务结束后返回LTE网络。
相关技术只区分了了PS域和CS域，若UE注册在5G网络时收到被叫请求且在PS域的被叫语音专载建立失败，则会通过启动CS RETRY流程换域到CS域进行重试。但是被叫语音专载建立失败后UE仍然注册在5G网络，启动的CS RETRY流程无法寻呼到UE，UE也失去了被叫重试的机会，从而降低了UE的语音呼通率。
发明内容
有鉴于此，提出了一种呼叫处理方法、装置及存储介质，在5G网络的呼叫过程中，当主叫UE通过5G语音(VOICE Over NR，VONR)方式向被叫UE发起的呼叫失败时，网络可以使用其他语音方案再次向被叫UE发起呼叫，这样可以提高主叫UE向被叫UE发起呼叫的接通率，满足用户的通话需求。
第一方面，本申请的实施例提供了一种呼叫处理方法，该方法包括：
代理呼叫会话控制功能(Proxy-Call Session Control Function，P-CSCF)设备接收UE的被叫请求消息，UE为注册在5G网络中的被叫终端；
P-CSCF设备确定UE在PS域的被叫语音专载建立失败；
P-CSCF设备向UE发送取消消息，取消消息用于指示UE选到4G网络并进行联合注册。
在该实现方式中，通过P-CSCF设备在确定注册在5G网络中的被叫终端即被叫UE在PS域的被叫语音专载建立失败后，向被叫UE发送取消消息，以指示被叫UE选到4G网络并进行联合注册；避免了相关技术中被叫语音专载建立失败后被叫UE仍 然注册在5G网络，启动的CS RETRY流程无法寻呼到被叫UE的情况，实现了在5G网络的呼叫过程中，在被叫失败后可通过取消消息指示被叫UE选到4G网络并进行联合注册，以便配合网络的CS RETRY流程再次向该被叫UE发起呼叫，这样可以提高主叫UE向被叫UE发起呼叫的语音呼通率。
在一个可能的实现方式中，上述UE选到4G网络可以为UE切换到4G网络或者UE从5G网络切换到4G网络。
在一个可能的实现方式中，上述UE注册在5G网络可以为UE驻留在5G网络。
结合第一方面，在第一方面的一种可能的实现方式中，P-CSCF设备确定UE在分组交换PS域的被叫语音专载建立失败之后，还包括：
P-CSCF设备向业务集中和连续性应用程序服务器(Service Centralization and Continuity Application Server，SCC AS)发送通知消息，通知消息用于指示SCC AS执行换域呼叫UE。
在该实现方式中，通过在被叫UE注册在5G网络的情况下，P-CSCF设备在确定被叫UE在PS域的被叫语音专载建立失败后，P-CSCF设备向被叫UE发送取消消息的同时，向SCC AS发送通知消息，取消消息以指示被叫UE选到4G网络并进行联合注册，通知消息以指示SCC AS执行换域呼叫被叫UE；即实现了在被叫失败后被叫UE和SCC AS同步进行CS RETRY流程，进一步提高了被叫UE的语音呼通率。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，取消消息或通知消息中携带承载资源分配失败的指示信息。
在该实现方式中，通过取消消息或通知消息中携带承载资源分配失败的指示信息，即利用承载资源分配失败的指示信息来指示被叫UE或SCC AS进行相应的操作，保证了P-CSCF设备能够明确指示被叫UE或SCC AS，保证了后续执行换域呼叫重试的可靠性。
结合第一方面，在第一方面的第三种可能的实现方式中，P-CSCF设备接收UE的被叫请求消息，包括：
P-CSCF设备接收SCC AS发送的UE的被叫请求消息，被叫请求消息携带有重试标识，重试标识用于指示网络支持被叫语音专载建立失败后的换域呼叫重试功能；
P-CSCF设备将被叫请求消息发送至UE。
若存在运营商的CS RETRY功能关闭的情况，在该实现方式中，通过P-CSCF设备接收到SCC AS发送的携带有重试标识的被叫请求消息后，通过重试标识通知被叫UE网络支持被叫语音专载建立失败后的换域呼叫重试功能，从而可以支持后续的联合注册步骤即被叫UE选到4G网络并进行联合注册，进一步保证了本申请实施例提供的呼叫处理方法的适用范围和可靠性。
结合第一方面的第二种可能的实现方式，在第一方面的第四种可能的实现方式中，取消消息或通知消息的原因报头中携带的原因字段为预设值，预设值用于指示资源分配失败。
在该实现方式中，通过取消消息或通知消息的原因报头中携带的原因字段为预设值，即利用具有预设值的原因字段来指示被叫UE或SCC AS进行相应的操作，进一 步保证了P-CSCF设备能够明确指示被叫UE或SCC AS，提高了后续执行换域呼叫重试的可靠性。
第二方面，本申请的实施例提供了一种呼叫处理方法，该方法包括：
UE接收P-CSCF设备发送的被叫请求消息，UE为注册在5G网络中的被叫终端；
UE在接收到P-CSCF设备发送的取消消息后，选到4G网络并进行联合注册。
结合第二方面，在第二方面的第一种可能的实现方式中，取消消息中携带承载资源分配失败的指示信息。
结合第二方面，在第二方面的第二种可能的实现方式中，被叫请求消息携带有重试标识，重试标识用于指示网络支持被叫语音专载建立失败后的换域呼叫重试功能。
结合第二方面的第一种可能的实现方式，在第二方面的第三种可能的实现方式中，取消消息的原因报头中携带的原因字段为预设值，预设值用于指示资源分配失败。
第三方面，本申请的实施例提供了一种呼叫处理方法，该方法包括：
SCC AS接收UE的被叫请求消息，UE为注册在5G网络中的被叫终端；
SCC AS在接收到P-CSCF设备发送的通知消息后，SCC AS执行换域呼叫UE；
其中，P-CSCF设备用于在确定UE在PS域的被叫语音专载建立失败后向UE发送取消消息和向SCC AS发送通知消息，取消消息用于指示UE选到4G网络并进行联合注册。
结合第三方面，在第三方面的第一种可能的实现方式中，取消消息或通知消息中携带承载资源分配失败的指示信息。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，该方法还包括：
当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS发送请求消息至移动交换中心(Mobile Switching Center，MSC)，请求消息用于指示MSC查询UE在CS域是否注册；
当SCC AS接收到用于指示UE在CS域未注册的原因值时，在预设时间间隔后再次执行发送请求消息至MSC的步骤。
在该实现方式中，通过当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS立即进行CS RETRY流程，保证了在被叫语音专载建立失败后进行换域呼叫重试的及时性。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第三种可能的实现方式中，该方法还包括：
当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动预配置的第一定时器，在第一定时器超时后发送请求消息至MSC，请求消息用于指示MSC查询UE在CS域是否注册；
当SCC AS接收到用于指示UE在CS域未注册的原因值时，在预设时间间隔后再次执行发送请求消息至MSC的步骤。
在该实现方式中，通过当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动一个定时器即第一定时器等待被叫UE切换至4G网络，避免MSC查询被叫UE在CS域是否注册时被叫UE尚未成功切换至4G网络的情况，减少了换域呼 叫重试的尝试次数，提高了被叫UE被成功路由到CS域的概率。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第四种可能的实现方式中，该方法还包括：
当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动预配置的第二定时器，在第二定时器超时后判断UE是否为IP多媒体系统(IP Multimedia Subsystem，IMS)注册状态，且向统一数据管理(Unified Data Manager，UDM)查询UE当前的注册域是否为4G网络；
当UE为IMS注册状态且UE当前的注册域为4G网络时，将呼叫域确定为PS域，再次执行启动预配置的第二定时器的步骤。
在运营商并没有CS网络或计划CS网路退网的情况下，在该实现方式中，通过当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动预配置的第二定时器，在第二定时器超时后判断被叫UE是否为IMS注册状态，且向UDM查询被叫UE当前的注册域是否为4G网络；若是，则将呼叫域确定为PS域，再次执行启动预配置的第二定时器的步骤；实现了在5G网络的被叫语音专载建立失败后，仍然可以执行换域呼叫重试，保证了本申请实施例提供的呼叫处理方法的适用范围和可靠性。
结合第三方面，在第三方面的第五种可能的实现方式中，SCC AS接收UE的被叫请求消息之后，包括：
SCC AS在被叫请求消息中添加重试标识，重试标识用于指示网络支持被叫语音专载建立失败后的换域呼叫重试功能；
SCC AS将携带有重试标识的被叫请求消息发送至P-CSCF设备。
结合第三方面的第一种可能的实现方式，在第三方面的第六种可能的实现方式中，取消消息或通知消息的原因报头中携带的原因字段为预设值，预设值用于指示资源分配失败。
第四方面，提供了一种呼叫处理装置，该装置包括至少一个单元，至少一个单元用于实现上述第一方面或第一方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第五方面，提供了一种呼叫处理装置，该装置包括至少一个单元，至少一个单元用于实现上述第二方面或第二方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第六方面，提供了一种呼叫处理装置，该装置包括至少一个单元，至少一个单元用于实现上述第三方面或第三方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第七方面，本申请的实施例提供了一种呼叫处理装置，该装置包括：处理器；用于存储处理器可执行指令的存储器；其中，处理器被配置为执行指令时实现上述第一方面或第一方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第八方面，本申请的实施例提供了一种呼叫处理装置，该装置包括：处理器；用于存储处理器可执行指令的存储器；其中，处理器被配置为执行指令时实现上述第二方面或第二方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第九方面，本申请的实施例提供了一种呼叫处理装置，该装置包括：处理器；用 于存储处理器可执行指令的存储器；其中，处理器被配置为执行指令时实现上述第三方面或第三方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第十方面，本申请的实施例提供了一种计算机程序产品，包括计算机可读代码，或者承载有计算机可读代码的非易失性计算机可读存储介质，当所述计算机可读代码在电子设备中运行时，所述电子设备中的处理器执行上述第一方面或者第一方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第十一方面，本申请的实施例提供了一种计算机程序产品，包括计算机可读代码，或者承载有计算机可读代码的非易失性计算机可读存储介质，当所述计算机可读代码在电子设备中运行时，所述电子设备中的处理器执行上述第二方面或者第二方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第十二方面，本申请的实施例提供了一种计算机程序产品，包括计算机可读代码，或者承载有计算机可读代码的非易失性计算机可读存储介质，当所述计算机可读代码在电子设备中运行时，所述电子设备中的处理器执行上述第三方面或者第三方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第十三方面，本申请的实施例提供了一种非易失性计算机可读存储介质，其上存储有计算机程序指令，计算机程序指令被处理器执行时实现上述第一方面或第一方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第十四方面，本申请的实施例提供了一种非易失性计算机可读存储介质，其上存储有计算机程序指令，计算机程序指令被处理器执行时实现上述第二方面或第二面中的任意一种可能的实现方式所提供的呼叫处理方法。
第十五方面，本申请的实施例提供了一种非易失性计算机可读存储介质，其上存储有计算机程序指令，计算机程序指令被处理器执行时实现上述第三方面或第三方面中的任意一种可能的实现方式所提供的呼叫处理方法。
第十六方面，本申请的实施例提供了一种呼叫处理系统，该系统包括P-CSCF设备、UE和SCC AS，该P-CSCF设备用于执行第一方面或第一方面中的任意一种可能的实现方式所提供的呼叫处理方法，该UE用于执行第二方面或第二方面中的任意一种可能的实现方式所提供的呼叫处理方法，该SCC AS用于执行第三方面或第三方面中的任意一种可能的实现方式所提供的呼叫处理方法。
附图说明
包含在说明书中并且构成说明书的一部分的附图与说明书一起示出了本申请的示例性实施例、特征和方面，并且用于解释本申请的原理。
图1示出了相关技术中4G网络中的被叫语音专载建立失败后进行换域呼叫重试方法的流程图。
图2示出了相关技术中5G网络中的被叫语音专载建立失败后进行换域呼叫重试方法的流程图。
图3示出了本申请一个实施例提供的通信系统的结构示意图。
图4示出了示出了本申请一个示例性实施例提供的呼叫处理方法的流程图。
图5示出了示出了本申请另一个示例性实施例提供的呼叫处理方法的流程图。
图6示出了示出了本申请另一个示例性实施例提供的呼叫处理方法的流程图。
图7示出了示出了本申请另一个示例性实施例提供的呼叫处理方法的流程图。
图8示出了本申请一个示例性实施例提供的呼叫处理装置的框图。
图9示出了本申请另一个示例性实施例提供的呼叫处理装置的框图。
图10示出了本申请另一个示例性实施例提供的呼叫处理装置的框图。
图11示出了本申请一个示例性实施例提供的P-CSCF设备的结构示意图。
图12示出了本申请一个示例性实施例提供的UE的结构示意图。
图13示出了本申请一个示例性实施例提供的SCC AS的结构示意图。
具体实施方式
以下将参考附图详细说明本申请的各种示例性实施例、特征和方面。附图中相同的附图标记表示功能相同或相似的元件。尽管在附图中示出了实施例的各种方面，但是除非特别指出，不必按比例绘制附图。
在这里专用的词“示例性”意为“用作例子、实施例或说明性”。这里作为“示例性”所说明的任何实施例不必解释为优于或好于其它实施例。
另外，为了更好的说明本申请，在下文的具体实施方式中给出了众多的具体细节。本领域技术人员应当理解，没有某些具体细节，本申请同样可以实施。在一些实例中，对于本领域技术人员熟知的方法、手段、元件和电路未作详细描述，以便于凸显本申请的主旨。
语音业务的呼通率是衡量语音业务质量的重要指标。在目前的无线通信网络中，存在很多种情况可能导致语音业务建立失败，比如被叫语音专载建立失败。本申请实施例主要涉及在被叫UE的被叫语音专载建立失败后进行换域呼叫重试流程。
其中，SCC AS实体的主要功能点包括被叫接入域选择功能(Terminating Access Domain Selection，T-ADS)。被叫UE在PS域(4G网络或5G网络的PS域)的被叫语音专载建立失败后，可以尝试换域至CS域。在4G网络中，以主叫UE为UE_A，被叫UE为UE_B为例，被叫语音专载建立失败后进行换域呼叫重试方法的流程如图1所示。其中，步骤101～103，UE_B注册在4G网络，接收到来自UE_A的被叫请求消息即INVITE消息，UE_B回复183响应消息，其中INVITE消息和183响应消息中均携带有会话描述协议(Session Description Protocol，SDP)信息；步骤104～110，P-CSCF设备发起被叫语音专载建立过程，确定被叫语音专载建立失败后，P-CSCF设备向SCC AS发送500/503错误消息，同时向UE_B通知取消(CANCEL)消息；步骤111～113，SCC AS启动CS RETRY流程，发送INVITE消息至MGCF设备；步骤114，通过电路交换回落(CS Fallback，CSFB)流程将被叫UE换域到CS域进行呼叫重试，即MGCF设备向MSC发送初始地址消息(Initial Address Message，IAM)消息，MSC查询到UE在CS域有注册，则通过CSFB流程执行换域呼叫UE_B。因此，在4G网络中，由于UE有联合注册，可以通过CS RETRY流程将被叫UE换域到CS域进行呼叫重试，提高呼叫的成功率。
而在5G网络中，以主叫UE为UE_A，被叫UE为UE_B为例，被叫语音专载建 立失败后进行换域呼叫重试方法的流程如图2所示。其中，步骤201～203，UE_B注册在5G网络，接收到来自UE_A的被叫请求消息即INVITE消息，UE_B回复183响应消息，其中INVITE消息和183响应消息中均携带有SDP信息；步骤204～210，P-CSCF设备发起被叫语音专载建立过程，建立失败后，P-CSCF设备向SCC AS回复500/503错误消息，同时向UE_B通知CANCEL消息；步骤211～214，SCC AS启动CS RETRY流程，发送INVITE消息至MGCF设备，MGCF设备向MSC发送IAM消息。步骤215，MSC查询到UE在CS域没有注册，直接返回404错误码。SCC AS接收到404错误码后，结束当前被叫流程。
相关技术只区分了了PS域和CS域，若UE注册在5G网络时收到被叫请求且在PS域的被叫语音专载建立失败，则会通过启动CS RETRY流程换域到CS域进行重试。可是UE在5G并没有联合注册机制，被叫语音专载建立失败后UE仍然注册在5G网络，启动的CS RETRY流程无法寻呼到UE，UE也失去了被叫重试的机会，从而降低了UE的语音呼通率。
目前，VONR被叫由于被叫语音专载建立失败而被取消的数量还是很大的，如果VONR也能复用上SCC AS的CS RETRY机制，将会提高用户设备的语音呼通率。本申请提供了一种呼叫处理方法、装置及存储介质。在5G网络的呼叫过程中，当主叫UE通过VONR方式向被叫UE发起的呼叫失败时，网络可以使用其他语音方案再次向被叫UE发起呼叫。这样可以提高主叫UE向被叫UE发起呼叫的接通率，满足用户的通话需求，保障用户的通话体验。
本申请技术方案可以应用于第五代移动通信技术(5th-Generation，5G)系统，还可以是5G的更下一代移动通信技术系统。本申请实施例对此不作限定。下面仅以上述通信系统为5G系统为例进行说明。
请参考图3，其示出了本申请一个实施例提供的通信系统30的结构示意图。该通信系统30包括：运营支撑层310、业务层320、核心网层330、接入层340和终端层350。
运营支撑层310包括一些对网元管理、计费支撑相关的网元。运营支撑层310可以包括切片分组网(Slicing Packet Network、SPN)、计费收集功能(Charging Collecting Function，CCF)、网元管理系统(Element Management System，EMS)等网元。
业务层320中包括SCC AS322。其中，SCC AS322的主要功能点包括T-ADS。被叫UE在PS域的被叫语音专载建立失败后，可以尝试换域至CS域。
核心网层330包括策略控制功能(Policy Control Function，PCF)设备331、服务呼叫会话控制功能(Serving-Call Session Control Function，S-CSCF)设备332、代理呼叫会话控制功能(Proxy-Call Session Control Function，P-CSCF)设备333、多媒体网关控制功能(Multimedia Gateway Control Function，MGCF)设备334。
PCF设备331：支持统一的策略框架来管理网络的行为，向接入及移动性管理实体(Access and Mobility Management Function，AMF)提供与接入和移动管理相关的策略。
S-CSCF设备332：是IIMS的核心所在，它位于归属网络，为UE进行会话控制和注册请求，但当UE处于会话中时，S-CSCF设备处理网络中的会话状态。在同一个 运营商的网络中，可以有多个S-CSCF设备332。
P-CSCF设备333：是IMS中用户的第一个联系点(在信令平面)，从SIP的角度来看，它是一个出站/入站的SIP代理服务器，所有的SIP信令，无论是来自UE，还是发送给UE的，都必须经过P-CSCF设备333。UE使用本地CSCF发现机制可以获得P-CSCF设备333的地址。P-CSCF设备333负责验证请求，将其转发给指定的目标，并且处理和转发响应。
MGCF设备334：为IMS的一个组成部分，与CSCF通信和控制媒体信道在一个IMS-MGW中的连接。MGCF设备334用于在ISDN用户部分即ISUP和IMS呼机控制协议之间执行协议转换。
核心网层330还可以包括/网关移动交换中心(Gateway Mobile Switching Center、GMSC)、MSC、访问位置寄存器(Visitor Location Register，VLR)。
接入层340包括移动管理节点(Mobility Management Entity，MME)。MME是LTE接入网络的关键控制节点，负责信令处理部分。比如，MME负责空闲模式的UE的定位、传呼过程。
需要说明的是，运营支撑层310、业务层320、核心网层330和接入层340中包括但不限于上述的网元。本实施例仅示意性地进行列举，对此不加以限定。
终端层350包括一个或者多个UE。UE可以是移动终端设备，比如，UE是移动电话(或称为“蜂窝”电话)或者是具有移动终端设备的计算机；示意性的，UE是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置。在采用不同的通信协议时，本申请实施例中的UE可以称为订户单元(Subscriber Unit)、订户站(Subscriber Station)，移动站(Mobile Station)、移动台(Mobile)、远程站(Remote Station)、接入点(Access Point)、远程终端设备(Remote Terminal)、接入终端设备(Access Terminal)、用户装置(User Terminal)、用户代理(User Agent)、终端设备(User Device)。可选地，UE还可以为中继(Relay)设备，本实施例对此不作限定。
需要说明的一点是，本申请实施例所涉及的一部分相关名词可参考3GPP协议中对应的相关描述，本文对此不再赘述。
需要说明的另一点是，当上述通信系统采用5G的更下一代移动通信技术系统时，上述各个网元在5G的更下一代移动通信技术系统中可能会具有不同的名称，但具有相同或相似的功能，本申请实施例对此不作限定。
下面，采用几个示例性实施例对本申请实施例提供的呼叫处理方法进行介绍。
请参考图4，其示出了本申请一个示例性实施例提供的呼叫处理方法的流程图，该方法用于图3所示的通信系统30中。该方法包括以下几个步骤。
步骤401，P-CSCF设备接收被叫UE的被叫请求消息，被叫UE为注册在5G网络中的被叫终端。
在本申请实施例中，呼叫是指一个终端向另一个终端发起音视频通话请求的过程。发起呼叫的一个终端为主叫终端，接收到呼叫的另一个终端为被叫终端。在被叫终端接受该呼叫后，主叫终端和被叫终端之间可以通话，即主叫终端和被叫终端之间可以传输语音、视频等多媒体数据，从而为两端的用户提供语音、视频等多媒体业务。为 了方便说明，下面仅以主叫终端为主叫UE，被叫终端为被叫UE为例进行说明。
可选地，被叫UE为注册在5G网络中的被叫终端，即被叫UE为附着并注册在5G网络中的被叫终端。P-CSCF设备接收到被叫UE的被叫请求消息后，将被叫请求消息转发至被叫UE。对应的，被叫UE接收P-CSCF设备发送的被叫请求消息。
其中，该被叫请求消息为用于请求建立IMS语音业务的消息。其中P-CSCF设备是IMS网络中的网元。
可选地，被叫请求消息为INVITE消息，INVITE消息中携带有SDP信息。
步骤402，P-CSCF设备确定被叫UE在PS域的被叫语音专载建立失败。
P-CSCF设备发起被叫语音专载建立过程，确定被叫UE在PS域的被叫语音专载建立失败后，执行步骤403。可选地，PS域为4G网络或5G网络的PS域。
其中，被叫语音专载建立失败是指主叫终端未成功呼叫到被叫终端。比如，被叫语音专载建立失败包括被叫语音专载建立和切换的冲突导致的失败。本申请实施例对被叫语音专载建立失败的情况不加以限定。
步骤403，P-CSCF设备向被叫UE发送取消消息。
P-CSCF设备确定被叫UE在PS域的被叫语音专载建立失败后，向被叫UE发送取消消息。
被叫UE为注册在5G网络中的被叫终端，取消消息用于指示被叫UE选到4G网络并进行联合注册。
步骤404，被叫UE在接收到P-CSCF设备发送的取消消息后，选到4G网络并进行联合注册。
被叫UE接收到P-CSCF设备发送的取消消息，该取消消息用于指示被叫UE选到4G网络并进行联合注册，则被叫UE选到4G网络并进行联合注册。在成功注册在4G网络后，等待网络的CS RETRY流程。其中，联合注册也可称为联合附着。
可选地，被叫UE选到4G网络并进行联合注册，包括：被叫UE选到4G网络执行跟踪区更新(Tracking Area Update，TAU)流程，并在4G网络注册预设时长。比如，预设时长为5s。本申请实施例对此不加以限定。
综上所述，本申请实施例通过P-CSCF设备在确定注册在5G网络中的被叫UE在PS域的被叫语音专载建立失败后，向被叫UE发送取消消息，以指示被叫UE选到4G网络并进行联合注册；避免了相关技术中被叫语音专载建立失败后被叫UE仍然注册在5G网络，启动的CS RETRY流程无法寻呼到被叫UE的情况，实现了在5G网络的呼叫过程中，在被叫失败后可通过取消消息指示被叫UE选到4G网络并进行联合注册，以便配合网络的CS RETRY流程再次向该被叫UE发起呼叫，这样可以提高主叫UE向被叫UE发起呼叫的语音呼通率。
请参考图5，其示出了本申请一个示例性实施例提供的呼叫处理方法的流程图，该方法用于图3所示的通信系统30中。该方法包括以下几个步骤。
步骤501，主叫UE向P-CSCF设备发送被叫请求消息。
该被叫请求消息用于请求建立IMS语音业务。其中，被叫请求消息中携带有SDP信息。
此时主叫UE处于5G网络的小区，该被叫请求消息为用于请求为5G网络的主叫UE在PS域建立IMS语音业务的消息。
步骤502，P-CSCF设备将被叫请求消息转发至被叫UE。
P-CSCF设备接收主叫UE发送的被叫请求消息，P-CSCF设备通过被叫请求消息将呼叫请求接续到被叫UE。其中，被叫请求消息中携带有SDP信息。
步骤503，被叫UE向P-CSCF设备返回183响应消息。
被叫UE接收P-CSCF设备发送的被叫请求消息，被叫UE返回183响应消息，在SDP信息中携带协商完成后的媒体类型及媒体编解码能力。
步骤504，P-CSCF设备向PCF设备发送鉴权授权请求(authentication authorization request，AAR)消息。
其中，AAR消息用于通知PCF设备建立语音专有承载。
可选地，AAR消息携带用户标识、IMS应用层计费标识和IMS语音业务的媒体描述信息，媒体描述信息包括如下信息的至少一种：分类器标识、带宽要求描述信息、媒体类型描述信息和QoS参数。
需要说明的是，P-CSCF设备可以直接向PCF设备发送AAR消息，也可以在接收到183响应消息之后向PCF设备发送AAR消息。其中，183响应消息是主叫UE的被叫请求消息被转发至被叫UE后，被叫UE做出的响应消息，可以经由被叫IMS网络、主叫IMS网络发送给PCF设备。
步骤505，PCF设备向P-CSCF设备返回认证、鉴权和审计(Authentication，Authorization and Accounting，AAA)消息。
可选地，AAA消息中携带PCF设备返回的用户位置信息。
步骤506，PCF设备向P-CSCF设备发送RAR(Re-Auth-Request)消息。
PCF设备通过进行呼叫业务检查，将呼叫会话和相应的IP-CAN会话进行承载绑定，并生成QoS规则，通过RAR消息下发给P-CSCF设备。
步骤507，P-CSCF设备收到RAR消息后，向PCF设备返回RAA(Re-Auth-Answer)消息。
P-CSCF设备向PCF设备返回RAA消息，随后建立语音专载。
步骤508，P-CSCF设备确定被叫UE在PS域的被叫语音专载建立失败。
P-CSCF设备发起专载建立过程，建立失败后，执行步骤509。
步骤509，P-CSCF设备向被叫UE发送取消消息，取消消息用于指示被叫UE选到4G网络并进行联合注册。
可选地，取消消息中携带承载资源分配失败的指示信息。示意性的，取消消息的原因报头中携带的原因字段为预设值，预设值用于指示资源分配失败。
在通信协议中规定了网络发给被叫UE的原因报头(Reason header)的原因(cause)字段具有3种可能的原因值，如表一所示。
表一
原因值 原因文本
1 媒体承载或QoS丢失
2 信号承载释放
3 资源分配失败的指示
其中，原因值“1”和原因值“2”协议中定义了具体的使用方法，而原因值“3”协议中没有规定具体的使用方法。可选地，本申请实施例中的原因字段的预设值为原因值“3”，原因值“3”为资源分配失败的指示，即利用到原因值“3”进行被叫UE和SCC AS之间的同步。需要说明的是，本申请实施例对原因字段的预设值的设置方式不加以限定。
步骤510，P-CSCF设备向SCC AS发送通知消息，通知消息用于指示SCC AS执行换域呼叫被叫UE。
P-CSCF设备确定被叫UE在PS域的被叫语音专载建立失败后，向SCC AS发送通知消息。
其中，通知消息用于指示SCC AS执行换域呼叫UE，即通知消息用于指示SCC AS通过CSFB流程换域到CS域进行呼叫重试。可选地，通知消息包括500/503错误消息。
可选地，通知消息中携带承载资源分配失败的指示信息。示意性的，通知消息的原因报头中携带的原因字段为预设值，预设值用于指示资源分配失败。比如，预设值为原因值“3”。
可选地，P-CSCF设备确定UE在PS域的被叫语音专载建立失败后，向被叫UE发送取消消息和向SCC AS发送通知消息可以同时进行，也可以分先后顺序执行。即步骤509和步骤510可以并列执行，也可以先执行步骤509再执行步骤510，还可以先执行步骤510再执行步骤509，本申请实施例对步骤509和步骤510的执行顺序不加以限定。
步骤511，当取消消息中携带承载资源分配失败的指示信息时，被叫UE选到4G网络并进行联合注册。
被叫UE注册在5G网络中，被叫UE在接收到P-CSCF设备发送的取消消息后，判断取消消息中是否携带承载资源分配失败的指示信息，若取消消息中携带承载资源分配失败的指示信息，则被叫UE选到4G网络并进行联合注册。在成功注册在4G网络后，等待网络的CS RETRY流程。
可选地，被叫UE在接收到P-CSCF设备发送的取消消息后，判断取消消息的原因报头中携带的原因字段是否为预设值，若取消消息的原因报头中携带的原因字段为预设值，则被叫UE选到4G网络并进行联合注册。
可选地，被叫UE选到4G网络并进行联合注册的同时，启动第三定时器，在第三定时器超时后，若仍未收到网络的CS寻呼(PAGING)消息，则被叫UE再次注册到5G网络。
可选地，该第三定时器为预配置的，比如，设置第三定时器的定时时长为5s。本申请实施例对第三定时器的设置方式不加以限定。
为了加快选网的流程，在一种可能的实现方式中，被叫UE在收到被叫请求消息时，若网络没有配置异系统测量，则被叫UE自主进行异系统测量，以便加快该步骤中的选网过程。
步骤512，当通知消息中携带承载资源分配失败的指示信息时，SCC AS执行换域呼叫被叫UE。
SCC AS在接收到P-CSCF设备发送的通知消息后，判断通知消息中是否携带承载 资源分配失败的指示信息，若通知消息中携带承载资源分配失败的指示信息，则SCC AS执行换域呼叫被叫UE，即SCC AS通过CSFB流程换域到CS域进行呼叫重试。
可选地，SCC AS在接收到P-CSCF设备发送的通知消息后，判断通知消息的原因报头中携带的原因字段是否为预设值，若通知消息的原因报头中携带的原因字段为预设值，则SCC AS执行换域呼叫被叫UE。
若通知消息的原因报头中携带的原因字段为预设值，且被叫UE注册在5G网络，SCC AS执行换域呼叫被叫UE。
SCC AS执行换域呼叫被叫UE的过程，包括但不限于以下两种可能的实现方式。
在一种可能的实现方式中，当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS发送请求消息至MSC，请求消息用于指示MSC查询被叫UE在电路交换CS域是否注册；当SCC AS接收到用于指示被叫UE在CS域未注册的原因值时，在预设时间间隔后再次执行发送请求消息至MSC的步骤。
可选地，当通知消息的原因报头中携带的原因字段为预设值，且被叫UE注册在5G网络时，SCC AS立即进行CS RETRY流程，即SCC AS将被叫请求消息传输至MSC，被叫请求消息用于指示MSC查询被叫UE在CS域是否注册；当SCC AS接收到用于指示被叫UE在CS域未注册的原因值时，在预设时间间隔后再次执行将被叫请求消息传输至MSC的步骤。
其中，SCC AS发送被叫请求消息给S-CSCF设备，S-CSCF设备将被叫请求消息发送至MGCF设备，MGCF设备将被叫请求消息发送至MSC。
可选地，SCC AS通过MGCF设备将被叫请求消息传输至MSC，MSC查询被叫UE在CS域是否注册，若被叫UE在CS域未注册则MSC返回用于指示被叫UE在CS域未注册的原因值至SCC AS。SCC AS在接收到MSC返回的用于指示被叫UE在CS域未注册的原因值时，在预设时间间隔后再次执行将被叫请求消息传输至MSC的步骤。比如，用于指示被叫UE在CS域未注册的原因值为404原因值，预设时间间隔为2s。本申请实施例对此不加以限定。
若被叫UE在CS域注册则MSC寻呼到被叫UE后进行CSFB流程，从而被叫UE被路由到CS域，CS呼叫建立。
SCC AS在预设时间间隔后再次执行将被叫请求消息传输至MSC的步骤的尝试次数可以动态配置。比如，尝试次数配置为3。本申请实施例对此不加以限定。
在另一种可能的实现方式中，当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动预配置的第一定时器，在第一定时器超时后发送请求消息至MSC，请求消息用于指示MSC查询被叫UE在CS域是否注册；当SCC AS接收到用于指示被叫UE在CS域未注册的原因值时，在预设时间间隔后再次执行发送请求消息至MSC的步骤。
可选地，当通知消息的原因报头中携带的原因字段为预设值，且UE注册在5G网络时，SCC AS启动一个定时器等待被叫UE选网注册在4G网络，该定时器可动态配置。即SCC AS启动预配置的第一定时器，在第一定时器超时后将被叫请求消息传输至MSC，被叫请求消息用于指示MSC查询UE在CS域是否注册；当SCC AS接收到用于指示UE在CS域未注册的原因值时，在预设时间间隔后再次执行将被叫请求消息 传输至MSC的步骤。
第一定时器是预配置的，比如第一定时器的定时时长为3s。本申请实施例对此不加以限定。
可选地，若被叫UE在CS域注册则MSC寻呼到被叫UE后进行CSFB流程，从而被叫UE被路由到CS域，CS呼叫建立。
需要说明的是，在该实现方式中，SCC AS将被叫请求消息传输至MSC，当SCC AS接收到用于指示被叫UE在CS域未注册的原因值时，在预设时间间隔后再次执行将被叫请求消息传输至MSC的步骤，相关细节可参考第一种可能的实现方式中的相关描述，在此不再赘述。
综上所述，本申请实施例还通过在被叫UE注册在5G网络的情况下，P-CSCF设备在确定被叫UE在PS域的被叫语音专载建立失败后，P-CSCF设备向被叫UE发送取消消息，并向SCC AS发送通知消息，取消消息以指示被叫UE选到4G网络并进行联合注册，通知消息以指示SCC AS执行换域呼叫被叫UE；即实现了在VONR/4G回落(EPS FALLBACK，EPSFB)被叫失败后，被叫UE和SCC AS同步进行CS RETRY流程，进一步提高了被叫UE的语音呼通率。
本申请实施例还通过取消消息或通知消息中携带承载资源分配失败的指示信息，利用承载资源分配失败的指示信息来指示被叫UE或SCC AS进行相应的操作，保证了P-CSCF设备能够明确指示被叫UE或SCC AS，保证了后续执行换域呼叫重试的可靠性。
本申请实施例还通过当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS发送请求消息至MSC，请求消息用于指示MSC查询被叫UE在CS域是否注册；当SCC AS接收到用于指示被叫UE在CS域未注册的原因值时，在预设时间间隔后再次执行发送请求消息至MSC的步骤；即当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS立即进行CS RETRY流程，保证了在被叫语音专载建立失败后进行换域呼叫重试的及时性。
本申请实施例还通过当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动预配置的第一定时器，在第一定时器超时后发送请求消息至MSC，请求消息用于指示MSC查询被叫UE在CS域是否注册；当SCC AS接收到用于指示被叫UE在CS域未注册的原因值时，在预设时间间隔后再次执行发送请求消息至MSC的步骤；即当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动一个定时器等待被叫UE切换至4G网络，避免MSC查询被叫UE在CS域是否注册时被叫UE尚未成功切换至4G网络的情况，减少了换域呼叫重试的尝试次数，提高了被叫UE被成功路由到CS域的概率。
目前存在一些运营商并没有CS网络，或者计划CS网路退网的情况，在这种情况下，上述的呼叫处理方法显然无法适用，所以在一种可能的实现方式中，上述步骤512可以被替换实现成为如下几个步骤，如图6所示：
步骤601，当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动预配置的第二定时器。
可选地，当通知消息的原因报头中携带的原因字段为预设值，且被叫UE注册在5G网络时，SCC AS启动第二定时器。
SCC AS接收P-CSCF设备发送的通知消息；判断通知消息的原因报头中携带的原因字段是否为预设值，预设值用于指示资源分配失败；若通知消息的原因报头中携带的原因字段为预设值且被叫被叫UE注册在5G网络时，则SCC AS启动第二定时器。
第二定时器是预配置的，比如第二定时器的定时时长为3s。本申请实施例对此不加以限定。
步骤602，在第二定时器超时后判断被叫UE是否为IMS注册状态，且向UDM查询被叫UE当前的注册域是否为4G网络。
在第二定时器超时后SCC AS判断被叫UE是否为IMS注册状态，且向UDM查询被叫UE当前的注册域是否为4G网络。若被叫UE为IMS注册状态且被叫UE当前的注册域为4G网络，则执行步骤603；若被叫UE不是IMS注册状态，或者被叫UE当前的注册域不是4G网络，则结束当前被叫流程。
步骤603，当被叫UE为IMS注册状态且被叫UE当前的注册域为4G网络时，则将呼叫域确定为PS域，再次执行启动预配置的第二定时器的步骤。
当被叫UE为IMS注册状态且被叫UE当前的注册域为4G网络时，则SCC AS将呼叫域确定为PS域，再次执行启动预配置的第二定时器的步骤。
SCC AS启动第二定时器的尝试次数可以动态配置。比如，尝试次数配置为3。本申请实施例对此不加以限定。
综上所述，在运营商并没有CS网络或计划CS网路退网的情况下，本申请实施例还通过当确定通知消息中携带承载资源分配失败的指示信息时，SCC AS启动预配置的第二定时器，在第二定时器超时后判断被叫UE是否为IMS注册状态，且向UDM查询被叫UE当前的注册域是否为4G网络；若是，则将呼叫域确定为PS域，再次执行启动预配置的第二定时器的步骤；实现了在5G网络的被叫语音专载建立失败后，仍然可以执行换域呼叫重试，保证了本申请实施例提供的呼叫处理方法的适用范围和可靠性。
目前存在一些运营商的CS RETRY功能可能关闭的情况，在这种情况下如果被叫UE收到取消消息后发起选到4G网络的动作，也无法将被叫UE注册在4G网络。所以在一种可能的实现方式中，如图7所示，上述步骤501和步骤502可以被替换实现成为如下几个步骤：
步骤701，主叫UE将被叫请求消息发送至S-CSCF设备。
主叫UE将被叫请求消息发送至S-CSCF设备，S-CSCF设备接收被叫请求消息。
步骤702，S-CSCF设备将被叫请求消息发送至SCC AS。
S-CSCF设备在接收到主叫UE发送的被叫请求消息后，将被叫请求消息发送至SCC AS。
步骤703，SCC AS将携带有重试标识的被叫请求消息发送至P-CSCF设备。
SCC AS在接收到被叫请求消息后，在被叫请求消息中添加重试标识，重试标识用于指示网络支持被叫语音专载建立失败后的换域呼叫重试功能；将携带有重试标识 的被叫请求消息发送至P-CSCF设备。
可选地，SCC AS在被叫请求消息的头域的support字段中添加重试标识，比如，重试标识为mt-retry。本申请实施例对此不加以限定。
步骤704，P-CSCF设备将携带有重试标识的被叫请求消息发送至被叫UE。
P-CSCF设备接收SCC AS发送的被叫UE的被叫请求消息，被叫请求消息中携带有重试标识；P-CSCF设备将携带有重试标识的被叫请求消息发送至被叫UE。被叫UE接收P-CSCF设备发送的携带有重试标识的被叫请求消息，重试标识用于指示网络支持被叫语音专载建立失败后的换域呼叫重试功能。
上述步骤511可以被替换实现成为如下步骤：
步骤711，当取消消息中携带承载资源分配失败的指示信息，且判断出网络支持被叫语音专载建立失败后的换域呼叫重试功能时，被叫UE选到4G网络并进行联合注册。
可选地，被叫UE注册在5G网络中，被叫UE接收到P-CSCF设备发送的取消消息后，判断取消消息的原因报头中携带的原因字段是否为预设值，并判断网络是否支持被叫语音专载建立失败后的换域呼叫重试功能。示意性的，判断网络是否支持被叫语音专载建立失败后的换域呼叫重试功能，也就是判断是否接收到重试标识。
若取消消息的原因报头中携带的原因字段为预设值，且判断出网络支持被叫语音专载建立失败后的换域呼叫重试功能，则被叫UE选到4G网络并进行联合注册。在成功注册在4G网络后，等待网络的CS RETRY流程。
综上所述，若存在运营商的CS RETRY功能关闭的情况，本申请实施例还通过SCC AS在接收到被叫请求消息后在被叫请求消息中添加重试标识，并通知被叫UE网络支持被叫语音专载建立失败后的换域呼叫重试功能，从而使得被叫UE接收到P-CSCF设备发送的取消消息后，若取消消息中携带承载资源分配失败的指示信息，且判断出网络支持被叫语音专载建立失败后的换域呼叫重试功能，则可以支持后续的步骤即被叫UE选到4G网络并进行联合注册，进一步保证了本申请实施例提供的呼叫处理方法的适用范围和可靠性。
请参考图8，其示出了本申请一个示例性实施例提供的呼叫处理装置的框图。该呼叫处理装置可以通过软件、硬件或者两者的结合实现成为图3所示的通信系统30中的P-CSCF设备的全部或者一部分。该呼叫处理装置可以包括：接收单元810、处理单元820和发送单元830。
接收单元810，用于实现上述步骤401的功能以及各个步骤中隐含的P-CSCF设备侧的接收功能；
处理单元820，用于实现上述步骤402、508的功能以及各个步骤中隐含的P-CSCF设备侧的处理功能；
发送单元830，用于实现上述步骤403、502、504、507、509、510的功能以及各个步骤中隐含的P-CSCF设备侧的发送功能。
相关细节可结合参考图4至图7所述的方法实施例。
请参考图9，其示出了本申请另一个示例性实施例提供的呼叫处理装置的框图。该呼叫处理装置可以通过软件、硬件或者两者的结合实现成为图3所示的通信系统30中的终端层中的UE的全部或者一部分，该UE为注册在5G网络中的被叫终端即为被叫UE。该呼叫处理装置可以包括：接收单元910、处理单元920和发送单元930。
接收单元910，用于实现上述接收P-CSCF设备发送的被叫请求消息的功能以及各个步骤中隐含的被叫UE侧的接收功能；
处理单元920，用于实现上述步骤404、511的功能以及各个步骤中隐含的被叫UE侧的处理功能；
发送单元930，用于实现上述步骤503、711的功能以及各个步骤中隐含的被叫UE侧的发送功能。
相关细节可结合参考图4至图7所述的方法实施例。
请参考图10，其示出了本申请另一个示例性实施例提供的呼叫处理装置的框图。该呼叫处理装置可以通过软件、硬件或者两者的结合实现成为图3所示的通信系统30中的SCC AS的全部或者一部分。该呼叫处理装置可以包括：接收单元1010、处理单元1020和发送单元1030。
接收单元1010，用于实现上述接收被叫UE的被叫请求消息的功能以及各个步骤中隐含的SCC AS侧的接收功能；
处理单元1020，用于实现上述步骤512、601、602、603的功能以及各个步骤中隐含的SCC AS侧的处理功能；
发送单元1030，用于实现上述步骤703的功能以及各个步骤中隐含的SCC AS侧的发送功能。
相关细节可结合参考图4至图7所述的方法实施例。
请参考图11，其示出了本申请一个示例性实施例提供的P-CSCF设备的结构示意图，该P-CSCF设备可以是图3所示的通信系统30中的P-CSCF设备。该P-CSCF设备包括：处理器111、接收器112、发射器113、存储器114和总线115。
处理器111包括一个或者一个以上处理核心，处理器111通过运行软件程序以及模块，从而执行各种功能应用以及信息处理。
接收器112和发射器113可以实现为一个通信组件，该通信组件可以是一块通信芯片，通信芯片中可以包括接收模块、发射模块和调制解调模块等，用于对信息进行调制和/或解调，并通过无线信号接收或发送该信息。
存储器114通过总线115与处理器111相连。存储器114存储有P-CSCF设备必要的程序指令和数据。
处理器111用于执行存储器114中的程序指令和数据以实现本申请各个方法实施例中由P-CSCF设备执行的各个步骤的功能。
处理器111通过运行存储器114中的至少一个程序指令，控制接收器112来实现上述各个步骤中P-CSCF设备侧的接收功能；处理器111通过运行存储器114中的至少一个程序指令，控制发射器113来实现上述各个步骤中P-CSCF设备侧的发送功能。
此外，存储器114可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随时存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
可以理解的是，图11仅仅示出了P-CSCF设备的简化设计。在其他的实施例中，P-CSCF设备可以包含任意数量的发射器，接收器，处理器，控制器，存储器，通信单元等，而所有可以实现本申请的P-CSCF设备都在本申请的保护范围之内。
请参考图12，其示出了本申请一个示例性实施例提供的UE的结构示意图，该UE可以是图3所示的通信系统30中的终端层中的UE，该UE为注册在5G网络中的被叫终端即为被叫UE。该UE包括：处理器121、接收器122、发射器123、存储器124和总线125。
处理器121包括一个或者一个以上处理核心，处理器121通过运行软件程序以及模块，从而执行各种功能应用以及信息处理。
接收器122和发射器123可以实现为一个通信组件，该通信组件可以是一块通信芯片，通信芯片中可以包括接收模块、发射模块和调制解调模块等，用于对信息进行调制和/或解调，并通过无线信号接收或发送该信息。
存储器124通过总线125与处理器121相连。存储器124存储有UE必要的程序指令和数据。
处理器121用于执行存储器124中的程序指令和数据以实现本申请各个方法实施例中由UE执行的各个步骤的功能。
处理器121通过运行存储器124中的至少一个程序指令，控制接收器122来实现上述各个步骤中被叫UE侧的接收功能；处理器121通过运行存储器124中的至少一个程序指令，控制发射器123来实现上述各个步骤中被叫UE侧的发送功能。
此外，存储器124可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随时存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
可以理解的是，图12仅仅示出了UE的简化设计。在其他的实施例中，UE可以包含任意数量的发射器，接收器，处理器，控制器，存储器，通信单元等，而所有可以实现本申请的UE都在本申请的保护范围之内。
请参考图13，其示出了本申请一个示例性实施例提供的SCC AS的结构示意图，该SCC AS可以是图3所示的通信系统30中的SCC AS。该SCC AS包括：处理器131、接收器132、发射器133、存储器134和总线135。
处理器131包括一个或者一个以上处理核心，处理器131通过运行软件程序以及模块，从而执行各种功能应用以及信息处理。
接收器132和发射器133可以实现为一个通信组件，该通信组件可以是一块通信芯片，通信芯片中可以包括接收模块、发射模块和调制解调模块等，用于对信息进行 调制和/或解调，并通过无线信号接收或发送该信息。
存储器134通过总线135与处理器131相连。存储器134存储有SCC AS必要的程序指令和数据。
处理器131用于执行存储器134中的程序指令和数据以实现本申请各个方法实施例中由SCC AS执行的各个步骤的功能。
处理器131通过运行存储器134中的至少一个程序指令，控制接收器132来实现上述各个步骤中SCC AS侧的接收功能；处理器131通过运行存储器134中的至少一个程序指令，控制发射器133来实现上述各个步骤中SCC AS侧的发送功能。
此外，存储器134可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随时存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
可以理解的是，图13仅仅示出了SCC AS的简化设计。在其他的实施例中，SCC AS可以包含任意数量的发射器，接收器，处理器，控制器，存储器，通信单元等，而所有可以实现本申请的SCC AS都在本申请的保护范围之内。
本申请的实施例提供了一种呼叫处理装置，该装置包括：处理器以及用于存储处理器可执行指令的存储器；其中，处理器被配置为执行指令时实现上述方法。
本申请的实施例提供了一种计算机程序产品，包括计算机可读代码，或者承载有计算机可读代码的非易失性计算机可读存储介质，当计算机可读代码在电子设备的处理器中运行时，电子设备中的处理器执行上述方法。
本申请的实施例提供了一种呼叫处理系统，该系统包括P-CSCF设备、UE和SCC AS，该P-CSCF设备包括如图8所示的呼叫处理装置，该UE包括如图9所示的呼叫处理装置，该SCC AS包括如图10所示的呼叫处理装置；或者，该P-CSCF设备包括如图11所示的P-CSCF设备，该UE包括如图12所示的UE，该SCC AS包括如图13所示的SCC AS。
本申请的实施例提供了一种非易失性计算机可读存储介质，其上存储有计算机程序指令，计算机程序指令被处理器执行时实现上述方法。
计算机可读存储介质可以是可以保持和存储由指令执行设备使用的指令的有形设备。计算机可读存储介质例如可以是――但不限于――电存储设备、磁存储设备、光存储设备、电磁存储设备、半导体存储设备或者上述的任意合适的组合。计算机可读存储介质的更具体的例子(非穷举的列表)包括：便携式计算机盘、硬盘、随机存取存储器(Random Access Memory，RAM)、只读存储器(Read Only Memory，ROM)、可擦式可编程只读存储器(Electrically Programmable Read-Only-Memory，EPROM或闪存)、静态随机存取存储器(Static Random-Access Memory，SRAM)、便携式压缩盘只读存储器(Compact Disc Read-Only Memory，CD-ROM)、数字多功能盘(Digital Video Disc，DVD)、记忆棒、软盘、机械编码设备、例如其上存储有指令的打孔卡或凹槽内凸起结构、以及上述的任意合适的组合。
这里所描述的计算机可读程序指令或代码可以从计算机可读存储介质下载到各个 计算/处理设备，或者通过网络、例如因特网、局域网、广域网和/或无线网下载到外部计算机或外部存储设备。网络可以包括铜传输电缆、光纤传输、无线传输、路由器、防火墙、交换机、网关计算机和/或边缘服务器。每个计算/处理设备中的网络适配卡或者网络接口从网络接收计算机可读程序指令，并转发该计算机可读程序指令，以供存储在各个计算/处理设备中的计算机可读存储介质中。
用于执行本申请操作的计算机程序指令可以是汇编指令、指令集架构(Instruction Set Architecture，ISA)指令、机器指令、机器相关指令、微代码、固件指令、状态设置数据、或者以一种或多种编程语言的任意组合编写的源代码或目标代码，所述编程语言包括面向对象的编程语言—诸如Smalltalk、C++等，以及常规的过程式编程语言—诸如“C”语言或类似的编程语言。计算机可读程序指令可以完全地在用户计算机上执行、部分地在用户计算机上执行、作为一个独立的软件包执行、部分在用户计算机上部分在远程计算机上执行、或者完全在远程计算机或服务器上执行。在涉及远程计算机的情形中，远程计算机可以通过任意种类的网络—包括局域网(Local Area Network，LAN)或广域网(Wide Area Network，WAN)—连接到用户计算机，或者，可以连接到外部计算机(例如利用因特网服务提供商来通过因特网连接)。在一些实施例中，通过利用计算机可读程序指令的状态信息来个性化定制电子电路，例如可编程逻辑电路、现场可编程门阵列(Field-Programmable Gate Array，FPGA)或可编程逻辑阵列(Programmable Logic Array，PLA)，该电子电路可以执行计算机可读程序指令，从而实现本申请的各个方面。
这里参照根据本申请实施例的方法、装置(系统)和计算机程序产品的流程图和/或框图描述了本申请的各个方面。应当理解，流程图和/或框图的每个方框以及流程图和/或框图中各方框的组合，都可以由计算机可读程序指令实现。
这些计算机可读程序指令可以提供给通用计算机、专用计算机或其它可编程数据处理装置的处理器，从而生产出一种机器，使得这些指令在通过计算机或其它可编程数据处理装置的处理器执行时，产生了实现流程图和/或框图中的一个或多个方框中规定的功能/动作的装置。也可以把这些计算机可读程序指令存储在计算机可读存储介质中，这些指令使得计算机、可编程数据处理装置和/或其他设备以特定方式工作，从而，存储有指令的计算机可读介质则包括一个制造品，其包括实现流程图和/或框图中的一个或多个方框中规定的功能/动作的各个方面的指令。
也可以把计算机可读程序指令加载到计算机、其它可编程数据处理装置、或其它设备上，使得在计算机、其它可编程数据处理装置或其它设备上执行一系列操作步骤，以产生计算机实现的过程，从而使得在计算机、其它可编程数据处理装置、或其它设备上执行的指令实现流程图和/或框图中的一个或多个方框中规定的功能/动作。
附图中的流程图和框图显示了根据本申请的多个实施例的装置、系统、方法和计算机程序产品的可能实现的体系架构、功能和操作。在这点上，流程图或框图中的每个方框可以代表一个模块、程序段或指令的一部分，所述模块、程序段或指令的一部分包含一个或多个用于实现规定的逻辑功能的可执行指令。在有些作为替换的实现中，方框中所标注的功能也可以以不同于附图中所标注的顺序发生。例如，两个连续的方 框实际上可以基本并行地执行，它们有时也可以按相反的顺序执行，这依所涉及的功能而定。
也要注意的是，框图和/或流程图中的每个方框、以及框图和/或流程图中的方框的组合，可以用执行相应的功能或动作的硬件(例如电路或ASIC(Application Specific Integrated Circuit，专用集成电路))来实现，或者可以用硬件和软件的组合，如固件等来实现。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其它变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其它单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
以上已经描述了本申请的各实施例，上述说明是示例性的，并非穷尽性的，并且也不限于所披露的各实施例。在不偏离所说明的各实施例的范围的情况下，对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择，旨在最好地解释各实施例的原理、实际应用或对市场中的技术的改进，或者使本技术领域的其它普通技术人员能理解本文披露的各实施例。

Claims (15)

  1. 一种呼叫处理方法，其特征在于，所述方法包括：
    代理呼叫会话控制功能P-CSCF设备接收用户设备UE的被叫请求消息，所述UE为注册在5G网络中的被叫终端；
    所述P-CSCF设备确定所述UE在分组交换PS域的被叫语音专载建立失败；
    所述P-CSCF设备向所述UE发送取消消息，所述取消消息用于指示所述UE选到4G网络并进行联合注册。
  2. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备确定所述UE在PS域的被叫语音专载建立失败之后，还包括：
    所述P-CSCF设备向业务集中和连续性应用程序服务器SCC AS发送通知消息，所述通知消息用于指示所述SCC AS执行换域呼叫所述UE。
  3. 根据权利要求1或2所述的方法，其特征在于，所述取消消息或通知消息中携带承载资源分配失败的指示信息。
  4. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备接收UE的被叫请求消息，包括：
    所述P-CSCF设备接收所述SCC AS发送的所述UE的所述被叫请求消息，所述被叫请求消息携带有重试标识，所述重试标识用于指示网络支持被叫语音专载建立失败后的换域呼叫重试功能；
    所述P-CSCF设备将所述被叫请求消息发送至所述UE。
  5. 一种呼叫处理方法，其特征在于，所述方法包括：
    用户设备UE接收代理呼叫会话控制功能P-CSCF设备发送的被叫请求消息，所述UE为注册在5G网络中的被叫终端；
    所述UE在接收到所述P-CSCF设备发送的取消消息后，选到4G网络并进行联合注册。
  6. 根据权利要求5所述的方法，其特征在于，所述取消消息中携带承载资源分配失败的指示信息。
  7. 根据权利要求5所述的方法，其特征在于，所述被叫请求消息携带有重试标识，所述重试标识用于指示网络支持被叫语音专载建立失败后的换域呼叫重试功能。
  8. 一种呼叫处理方法，其特征在于，所述方法包括：
    业务集中和连续性应用程序服务器SCC AS接收用户设备UE的被叫请求消息，所述UE为注册在5G网络中的被叫终端；
    所述SCC AS在接收到代理呼叫会话控制功能P-CSCF设备发送的通知消息后，所述SCC AS执行换域呼叫所述UE；
    其中，所述P-CSCF设备用于在确定所述UE在分组交换PS域的被叫语音专载建立失败后向所述UE发送取消消息和向所述SCC AS发送所述通知消息，所述取消消息用于指示所述UE选到4G网络并进行联合注册。
  9. 根据权利要求8所述的方法，其特征在于，所述取消消息或所述通知消息中携带承载资源分配失败的指示信息。
  10. 根据权利要求8或9所述的方法，其特征在于，所述方法还包括：
    当确定所述通知消息中携带承载资源分配失败的指示信息时，所述SCC AS发送请求消息至移动交换中心MSC，所述请求消息用于指示所述MSC查询所述UE在电路交换CS域是否注册；
    当所述SCC AS接收到用于指示所述UE在所述CS域未注册的原因值时，在预设时间间隔后再次执行发送请求消息至MSC的步骤。
  11. 根据权利要求8或9所述的方法，其特征在于，所述方法还包括：
    当确定所述通知消息中携带承载资源分配失败的指示信息时，所述SCC AS启动预配置的第一定时器，在所述第一定时器超时后发送请求消息至MSC，所述请求消息用于指示所述MSC查询所述UE在CS域是否注册；
    当所述SCC AS接收到用于指示所述UE在所述CS域未注册的原因值时，在预设时间间隔后再次执行发送请求消息至MSC的步骤。
  12. 根据权利要求8或9所述的方法，其特征在于，所述方法还包括：
    当确定所述通知消息中携带承载资源分配失败的指示信息时，所述SCC AS启动预配置的第二定时器，在所述第二定时器超时后判断所述UE是否为IP多媒体系统IMS注册状态，且向统一数据管理UDM查询所述UE当前的注册域是否为4G网络；
    当所述UE为所述IMS注册状态且所述UE当前的注册域为4G网络时，将呼叫域确定为所述PS域，再次执行启动预配置的第二定时器的步骤。
  13. 根据权利要求8所述的方法，其特征在于，所述SCC AS接收UE的被叫请求消息之后，包括：
    所述SCC AS在所述被叫请求消息中添加重试标识，所述重试标识用于指示网络支持被叫语音专载建立失败后的换域呼叫重试功能；
    所述SCC AS将携带有所述重试标识的所述被叫请求消息发送至所述P-CSCF设备。
  14. 一种呼叫处理装置，其特征在于，所述装置包括：
    处理器；
    用于存储处理器可执行指令的存储器；
    其中，所述处理器被配置为执行所述指令时实现权利要求1-4任意一项所述的方法、或者实现权利要求5-7任意一项所述的方法、或者实现权利要求8-13任意一项所述的方法。
  15. 一种非易失性计算机可读存储介质，其上存储有计算机程序指令，其特征在于，所述计算机程序指令被处理器执行时实现权利要求1-4任意一项所述的方法、或者实现权利要求5-7任意一项所述的方法、或者实现权利要求8-13任意一项所述的方法。
PCT/CN2021/124452 2020-10-23 2021-10-18 呼叫处理方法、装置及存储介质 WO2022083552A1 (zh)

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