WO2018000276A1 - 一种业务处理方法及装置 - Google Patents

一种业务处理方法及装置 Download PDF

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Publication number
WO2018000276A1
WO2018000276A1 PCT/CN2016/087766 CN2016087766W WO2018000276A1 WO 2018000276 A1 WO2018000276 A1 WO 2018000276A1 CN 2016087766 W CN2016087766 W CN 2016087766W WO 2018000276 A1 WO2018000276 A1 WO 2018000276A1
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WIPO (PCT)
Prior art keywords
service
core network
network device
ims core
called
Prior art date
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PCT/CN2016/087766
Other languages
English (en)
French (fr)
Inventor
崇卫微
吴晓波
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2018564750A priority Critical patent/JP6732229B2/ja
Priority to EP16906677.6A priority patent/EP3442273B1/en
Priority to PCT/CN2016/087766 priority patent/WO2018000276A1/zh
Priority to BR112018076603-8A priority patent/BR112018076603B1/pt
Priority to KR1020187034710A priority patent/KR102163634B1/ko
Priority to CN201680073655.9A priority patent/CN108476448B/zh
Publication of WO2018000276A1 publication Critical patent/WO2018000276A1/zh
Priority to US16/226,183 priority patent/US10812534B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1046—Call controllers; Call servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1073—Registration or de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network
    • 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
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a service processing method and apparatus.
  • VoLTE Voice over LTE
  • UE User Equipment
  • VoLTE is a voice technology based on IP (Internet Protocol) data transmission. All services are carried on the LTE network, which enables data and voice services to be unified under the same network.
  • the current VoLTE service cannot fully support various supplementary services accompanying voice calls. For example, the original personalized CRBT service, call forwarding service, and voice mailbox service may not be supported.
  • the VoLTE service cannot be used, which seriously affects the user's call quality.
  • the present application provides a service processing method and apparatus for solving the technical problem that the voice service connection rate of the user equipment is low due to the attempt to establish a VoLTE service when the VoLTE service cannot be established.
  • a service processing method provided by the application includes:
  • the Internet Protocol Multimedia Subsystem IMS core network device receives a request message for the user equipment UE to establish a long term evolution network voice transmission VoLTE service in the packet switched PS domain;
  • the IMS core network device determines that the circuit domain of the UE is triggered to fall back the CSFB service after the VoLTE service is established in the PS domain.
  • the IMS core network device receives the request message for establishing the VoLTE service for the UE, and after determining that the VoLTE service cannot be established, triggers the CSFB service of the UE, thereby directly triggering the CSFB of the UE if the VoLTE service cannot be established.
  • the service does not need to try to establish a VoLTE service, thereby improving the success rate of the user equipment, ensuring the voice service and supplementary service requested by the UE, and ensuring a good user experience.
  • the IMS core network device determines that the VoLTE service cannot be established in the PS domain after the following at least one condition exists:
  • the IMS core network device determines that the service network where the UE is currently located does not support the VoLTE service
  • the IMS core network device determines that the voice bearer establishment of the VoLTE service in the PS domain fails.
  • the IMS core network device determines that the VoLTE service cannot be established in the PS domain. Because the above three situations comprehensively consider the situation that the VoLTE service cannot be established in the process of establishing the VoLTE service in the PS domain, the CSFB service of the UE can be effectively triggered, and attempts to establish a VoLTE service are avoided as much as possible.
  • the IMS core network device acquires at least one supplementary service that is associated with the VoLTE service, including:
  • the IMS core network device acquires at least one supplementary service accompanying the VoLTE service according to the subscription information of the UE; or
  • the IMS core network device acquires at least one supplementary service accompanying the VoLTE service in a supplementary service setup request message sent by the UE.
  • the IMS core network device can obtain at least one supplementary service in the foregoing two manners, so as to facilitate subsequent determination of whether there is an unavailable supplementary service.
  • the IMS core network device determines that the service network where the UE is currently located does not support
  • the VoLTE service includes: the IMS core network device determines that the visited public land mobile network VPLMN does not activate the VoLTE service function, or the VLTE service is not signed between the VPLMN where the UE is located and the home public land mobile network HPLMN. Roaming agreement.
  • the IMS core network device determines that the visited public uplink mobile network VPLMN does not activate the VoLTE service function after the at least one of the following conditions is met:
  • the VPLMN is not in a network white list in which the VoLTE service function has been activated;
  • the VPLMN is in a blacklist in which the VoLTE service function is not activated
  • VoLTE roaming agreement is not signed between the VPLMN and the home public land mobile network HPLMN;
  • the proxy-call session control function P-CSCF of the VPLMN is not in the white list supporting the VoLTE service function;
  • the P-CSCF of the VPLMN is in a blacklist that does not support the VoLTE service function.
  • the present invention when determining whether the VPLMN service function is enabled in the VPLMN, the present invention can determine from the above multiple angles according to actual conditions.
  • the IMS core network device determines that the voice bearer establishment of the VoLTE service in the PS domain fails, including:
  • the IMS core network device Determining, by the IMS core network device, that the RAR message or the ASR message carries the indication information indicating that the bearer resource is insufficient or the indication information for indicating the resource allocation failure, determining the voice bearer of the VoLTE service in the PS domain. The establishment failed.
  • the IMS core network device can follow the indication message carried in the RAR message or the ASR message.
  • the information determines that the voice bearer establishment of the VoLTE service fails.
  • the RAR message or the ASR message includes a cause value of the voice bearer establishment failure of the VoLTE service.
  • the RAR message or the ASR message carries the cause value of the voice bearer establishment failure of the VoLTE service, thereby facilitating the IMS core network device to record the specific cause of the failure of the voice bearer establishment, and providing a basis for subsequent analysis.
  • the cause of the failure of the voice bearer setup of the VoLTE service included in the RAR message or the ASR message is that the UE is in a weak coverage area of the PS domain.
  • the method further includes:
  • the IMS core network device determines that the UE is registered in a circuit switched domain.
  • the IMS core network device may trigger the CSFB service of the UE after determining that the UE has registered to the circuit switched domain, and when the IMS core network device determines that the UE has not been registered to the circuit, In the case of the switching domain, even if the IMS core network device determines that the VoLTE service cannot be established, the IMS core network device may not trigger the CSFB service of the UE. In this way, the CSFB service of the UE can be triggered after the UE has been registered in the circuit switched domain, ensuring that the CSFB service is successfully triggered. If the UE is not registered in the circuit switched domain, the CSFB service can no longer be triggered, thereby avoiding redundant triggering. Process, saving processing resources.
  • the IMS core network device determines that the UE has been registered in a circuit switched domain, including:
  • the IMS core network device determines that the UE is registered in a circuit switched domain according to information that the UE registers with the CS network.
  • the UE is a calling UE of a VoLTE service
  • the IMS core network device triggers the CSFB service of the UE, including:
  • the IMS core network device sends a first message to the calling UE, where the first message is used to trigger the calling UE to initiate a circuit domain to fall back to the CSFB calling service.
  • the IMS core network device triggers the calling UE to initiate by sending a first message to the calling UE.
  • CSFB calls the service, which enables the CSFB service to be triggered quickly.
  • the first message includes a first cause value, where the first cause value is used to notify the calling UE of a specific cause that the VoLTE service is unavailable.
  • the calling UE can be conveniently recorded, thereby providing a basis for subsequent statistical analysis and the like.
  • the method before the sending, by the IMS core network device, the first message to the calling UE, the method further includes:
  • the IMS core network device determines that the called UE corresponding to the calling UE is in a pre-ringing state.
  • the IMS core network device may trigger the CSFB service of the UE after determining that the called UE corresponding to the calling UE is in the pre-ringing state, and determine that the calling UE corresponds to the IMS core network device.
  • the IMS core network device may not trigger the CSFB service of the UE. In this way, the CSFB service of the UE can be triggered only after the called UE corresponding to the calling UE is in the pre-ringing state, and the user is not perceived. If the called UE corresponding to the calling UE has ringed, then The CSFB service is triggered again to avoid redundant triggering processes and save processing resources.
  • the IMS core network device serves as a calling party service call session control function I/S-CSCF or a calling party service centralization and continuity application server SCC AS or a calling party agent-call session control function P-CSCF .
  • the UE is a called UE of a VoLTE service
  • the IMS core network device triggers the CSFB service of the UE, including:
  • the IMS core network device sends a second message to the called domain selection device, where the second message is used to indicate that the called service establishment fails in the PS domain, so that the called domain selection device triggers the The circuit domain called the UE falls back to the CSFB called service.
  • the IMS core network device triggers the CSFB service of the called UE by sending a second message to the called UE, so that the CSFB service can be triggered quickly.
  • the second message includes a second cause value, where the second cause value is used to notify the The specific reason why the called domain selection device fails to establish the called party in the PS domain.
  • the called domain selection device can be conveniently recorded, thereby providing a basis for subsequent statistical analysis and the like.
  • the method before the sending, by the IMS core network device, the second message to the called domain selection device, the method further includes:
  • the IMS core network device determines that the called UE is in a pre-ringing state.
  • the IMS core network device may trigger the CSFB service of the UE after determining that the called UE is in the pre-ringing state, and when the IMS core network device determines that the called UE has ringed, Even if the IMS core network device determines that the VoLTE service cannot be established, the IMS core network device may not trigger the CSFB service of the UE. In this way, the CSFB service of the UE can be triggered after the called UE is in the pre-ringing state, and the user is not perceived. If the called UE has ringed, the CSFB service can no longer be triggered, thereby avoiding redundant triggering. Process, saving processing resources.
  • the IMS core network device serves the called party service call session control function I/S-CSCF or the called party service centralization and continuity application server SCC AS or the called party agent-call session control function P-CSCF .
  • the IMS core network device sends a second message to the called domain selection device, including:
  • the called party P-CSCF sends the second message to the called party I/S-CSCF, so that the called party I/S-CSCF forwards the second message to the called party Domain selection device.
  • the application provides an IMS core network device, where the IMS core network device includes: a transceiver module and a processing module;
  • the transceiver module is configured to receive a request message for establishing, by the user equipment UE, a long-term evolution network voice transmission VoLTE service in a packet-switched PS domain;
  • the processing module is configured to determine that the circuit domain of the UE is triggered to fall back the CSFB service after the VoLTE service cannot be established in the PS domain.
  • the processing module is specifically configured to: after determining that at least one of the following conditions is determined, determine that the VoLTE service cannot be established in the PS domain:
  • the processing module acquires at least one supplementary service that accompanies the VoLTE service by:
  • the processing module is configured to: determine, by using the following manner, that the service network where the UE is currently located does not support the VoLTE service: determining that the public land mobile network VPLMN where the UE is located does not activate the VoLTE service function or The VoLTE service roaming agreement is not signed between the VPLMN where the UE is located and the home land mobile network HPLMN.
  • the processing module is specifically configured to: after determining that at least one of the following conditions is determined, determining that the visited public land mobile network VPLMN where the UE is located does not activate the VoLTE service function:
  • the VPLMN is not in a network white list in which the VoLTE service function has been activated;
  • the VPLMN is in a blacklist in which the VoLTE service function is not activated
  • VoLTE roaming agreement is not signed between the VPLMN and the home public land mobile network HPLMN;
  • the proxy-call session control function P-CSCF of the VPLMN is not in the white list supporting the VoLTE service function;
  • the P-CSCF of the VPLMN is in a blacklist that does not support the VoLTE service function.
  • the processing module is specifically configured to determine, by using the following manner, that the voice bearer establishment failure of the VoLTE service in the PS domain is:
  • the RAR message or the ASR message includes a cause value of the voice bearer establishment failure of the VoLTE service.
  • the cause of the failure of the voice bearer setup of the VoLTE service included in the RAR message or the ASR message is that the UE is in a weak coverage area of the PS domain.
  • the method is further configured to:
  • the processing module is specifically configured to determine that the UE is registered in a circuit switched domain by:
  • the UE is a calling UE of a VoLTE service
  • the processing module is specifically configured to trigger the CSFB service of the UE by:
  • the transceiver module And sending, by the transceiver module, the first message to the calling UE, where the first message is used to trigger the calling UE to initiate a circuit domain to fall back to the CSFB calling service.
  • the first message includes a first cause value, where the first cause value is used to notify the calling UE of a specific cause that the VoLTE service is unavailable.
  • the processing module is further configured to:
  • the IMS core network device serves as a calling party service call session control function I/S-CSCF or a calling party service centralization and continuity application server SCC AS or a calling party agent-call session control function P-CSCF .
  • the UE is a called UE of a VoLTE service
  • the processing module is specifically configured to trigger the CSFB service of the UE by:
  • the second message includes a second cause value, where the second cause value is used to notify the called domain selection device of a specific reason for the called establishment failure of the PS domain.
  • the processing module is further configured to:
  • the IMS core network device serves the called party service call session control function I/S-CSCF or the called party service centralization and continuity application server SCC AS or the called party agent-call session control function P-CSCF .
  • the processing module sends a second message to the called domain selection device by using the transceiver module, specifically:
  • the processing module of the called party P-CSCF sends the second message to the called party I/S-CSCF through the transceiver module, so that the called party I/S-CSCF will The second message is forwarded to the called domain selection device.
  • the present application provides another IMS core network device, where the IMS core network device includes: a communication interface and a processor;
  • the communication interface is configured to receive a request message for establishing, by the user equipment UE, a long term evolution network voice transmission VoLTE service in a packet switched PS domain;
  • the processor is configured to determine that the circuit domain of the UE is triggered to fall back the CSFB service after the VoLTE service cannot be established in the PS domain.
  • the processor is specifically configured to: after determining that at least one of the following conditions is determined, determine that the VoLTE service cannot be established in the PS domain:
  • the processor acquires at least one supplementary service accompanying the VoLTE service by:
  • the processor is specifically configured to: determine, by the following manner, that the service network where the UE is currently located does not support the VoLTE service: determining that the public land mobile network VPLMN where the UE is located does not activate the VoLTE service function or the The VoLTE service roaming agreement is not signed between the VPLMN where the UE is located and the home land mobile network HPLMN.
  • the processor is specifically configured to: after determining that at least one of the following conditions is determined, determining that the visited public land mobile network VPLMN where the UE is located does not activate the VoLTE service function:
  • the VPLMN is not in a network white list in which the VoLTE service function has been activated;
  • the VPLMN is in a blacklist in which the VoLTE service function is not activated
  • VoLTE roaming agreement is not signed between the VPLMN and the home public land mobile network HPLMN;
  • the proxy-call session control function P-CSCF of the VPLMN is not in the white list supporting the VoLTE service function;
  • the P-CSCF of the VPLMN is in a blacklist that does not support the VoLTE service function.
  • the processor is specifically configured to determine, by using the following manner, that the voice bearer establishment failure of the VoLTE service in the PS domain is:
  • the RAR message or the ASR message includes a cause value of the voice bearer establishment failure of the VoLTE service.
  • the cause of the failure of the voice bearer setup of the VoLTE service included in the RAR message or the ASR message is that the UE is in a weak coverage area of the PS domain.
  • the method is further configured to:
  • the processor is specifically configured to determine that the UE is registered in a circuit switched domain by:
  • the UE is a calling UE of a VoLTE service
  • the processor is specifically configured to trigger the CSFB service of the UE by:
  • the first message includes a first cause value, where the first cause value is used to notify the calling UE of a specific cause that the VoLTE service is unavailable.
  • the processor before the sending, by the communications interface, the first message to the calling UE, the processor is further configured to:
  • the IMS core network device serves as a calling party service call session control function I/S-CSCF or a calling party service centralization and continuity application server SCC AS or a calling party agent-call session control function P-CSCF .
  • the UE is a called UE of a VoLTE service
  • the processor is specifically configured to trigger the CSFB service of the UE by:
  • the second message includes a second cause value, where the second cause value is used to notify the called domain selection device of a specific reason for the called establishment failure of the PS domain.
  • the processor before the sending, by the communications interface, the second message to the called domain selection device, the processor is further configured to:
  • the IMS core network device serves the called party service call session control function I/S-CSCF or the called party service centralization and continuity application server SCC AS or the called party agent-call session control function P-CSCF .
  • the processor sends a second message to the called domain selection device by using the communication interface, specifically:
  • the processor of the called party P-CSCF sends the second message to the called party I/S-CSCF through the communication interface, so that the called party I/S-CSCF will The second message is forwarded to the called domain selection device.
  • the IMS core network device receives a request message for establishing a VoLTE service for the UE, and after determining that the VoLTE service cannot be established, the IMS core network device triggers the CSFB service of the UE, so that when the VoLTE service cannot be established, The CSFB service of the UE is directly triggered, and the VoLTE service is not required to be established, thereby improving the success rate of the user equipment, ensuring the voice service and the supplementary service requested by the UE, ensuring a good user experience, and avoiding the UE being unable to use the VoLTE service. And the technical problem of processing time.
  • FIG. 1 is a schematic structural diagram of a communication network provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a service processing method according to Embodiment 1 of the present application.
  • FIG. 3 is a schematic flowchart of a service processing method according to Embodiment 2 of the present application.
  • FIG. 4 is a schematic flowchart of a service processing method according to Embodiment 3 of the present application.
  • FIG. 5 is a schematic flowchart of a service processing method according to Embodiment 4 of the present application.
  • FIG. 6 is a schematic flowchart of a service processing method according to Embodiment 5 of the present application.
  • FIG. 7 is a schematic flowchart of a service processing method according to Embodiment 6 of the present application.
  • FIG. 8 is a schematic flowchart of a service processing method according to Embodiment 7 of the present application.
  • FIG. 9 is a schematic structural diagram of an IMS core network device according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of another IMS core network device according to an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a communication network according to an embodiment of the present application.
  • the evolved base station (eNB, Evolved NodeB) and the user equipment can be connected by using a wireless link.
  • the core network devices of the LTE network shown in the example shown in FIG. 1 include a Mobility Management Entity (MME), a Serving Gateway (SGW), a Packet Data Network Gateway (PGW, PDN Gateway), policy, and accounting.
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • PGW Packet Data Network Gateway
  • IMS Internet Protocol Multimedia Subsystem
  • Figure 1 also includes an IMS core network device, specifically: proxy call session control function (Proxy Call Session Control Function (P-CSCF) entity, query/service call session control function (I/S-CSCF) entity, service centralization and continuity application server (service centralization and continuity application server, SCC AS).
  • proxy call session control function Proxy Call Session Control Function (P-CSCF) entity
  • I/S-CSCF query/service call session control function
  • SCC AS service centralization and continuity application server
  • the P-CSCF (which can be divided into the calling party P-CSCF and the called party P-CSCF) is the first point of contact for the UE to access the IMS network in the VoLTE service process.
  • the P-CSCF can be responsible for all VoLTE related signaling and complete routing control.
  • the P-CSCF may also be responsible for sending related control messages and the like to the Policy and Charging Rules Function (PCRF) entity during the VoLTE call.
  • PCRF Policy and Charging Rules Function
  • the P-CSCF generally refers to the P-CSCF of the UE visiting the Public Land Mobile Network (VPLMN).
  • VPN Public Land Mobile Network
  • the I/S-CSCF (which can be divided into the calling party I/S-CSCF and the called party I/S-CSCF) is the service switching center of the IMS network, and the I/S-CSCF can be mainly responsible for receiving and processing the registration of the UE. Request, user management, session control, service switching, service control, Session Initiation Protocol (SIP) message processing and billing, etc.
  • the I/S-CSCF can also trigger, for example, a SIP request to the corresponding domain selection service device according to the triggering principle of the application.
  • the SCC AS can be divided into the calling party SCC AS and the called party SCC AS. It is the general name of the application layer server in the IMS network and is responsible for providing various application layer services.
  • the SCC AS may include a T-ADS (Terminating Access Domain Selection), so the SCC AS may be used as the called domain selection device, and is responsible for connecting the called voice session to the corresponding Domain (for example, CS domain or PS domain).
  • the called domain selection device may decide to initiate a VoLTE call (corresponding to the PS domain) to the UE or a conventional circuit domain call (corresponding to the CS domain).
  • the SCC AS may not include the called access domain selection function.
  • the called domain selection device may be separately set, and the called voice session is connected to the corresponding domain (for example, the CS domain or the PS domain).
  • the called access domain selection function may be included in the SCC AS.
  • the embodiments of the present application can be applied to networks such as an LTE network.
  • the user equipment may be a wireless terminal or a wired terminal, and may be, for example, a mobile phone, a computer, a tablet computer, or a personal digital assistant (English: personal digital Assistant, abbreviation: PDA), mobile Internet device (English: mobile Internet device, abbreviation: MID), wearable device and e-book reader (English: e-book reader).
  • PDA personal digital Assistant
  • MID mobile Internet device
  • e-book reader English: e-book reader
  • Some technical solutions of the embodiments of the present application may be specifically implemented based on the communication network architecture illustrated in FIG. 1 or a modified architecture thereof.
  • the IMS core network device may be a serving call session control function I/S-CSCF or a service centralization and continuity application server SCC AS or a proxy-call session control function P-CSCF.
  • FIG. 2 is a schematic flowchart of a service processing method according to Embodiment 1 of the present application. As shown in Figure 2, the method includes:
  • Step 201 The IMS core network device receives a request message for establishing a VoLTE service for the UE.
  • Step 202 After the IMS core network device determines that the VoLTE service cannot be established, triggering the CSFB service of the UE.
  • the determining, by the IMS core network device, that the VoLTE cannot be established may be: the IMS core network device acquiring at least one supplementary service that is associated with the VoLTE service, and determining that the at least one supplementary service is unavailable.
  • the IMS core network device may obtain at least one supplementary service that is accompanied by the VoLTE service in the following manner: (1), the IMS core network device acquires at least one item accompanying the VoLTE service according to the subscription information of the UE. Supplementary service; (2), the IMS core network device acquires at least one supplementary service accompanying the VoLTE service in the supplementary service establishment request message sent by the UE.
  • the IMS core network device determines that the VoLTE cannot be established.
  • the IMS core network device determines that the service network where the UE is currently located does not support the VoLTE service.
  • the method includes: the IMS core network device determines that the VPLMN where the UE is located does not activate the VoLTE service function, or does not sign the VoLTE between the VPLMN where the UE is located and the Home Public Land Mobile Network (HPLMN). Business roaming agreement.
  • the VTLMN service function of the VPLMN where the UE is located is determined:
  • the VPLMN is not in a network white list in which the VoLTE service function has been activated;
  • the VPLMN is in a blacklist in which the VoLTE service function is not activated
  • VoLTE roaming protocol is not signed between the VPLMN and the HPLMN;
  • the P-CSCF of the VPLMN is not in the white list supporting the VoLTE service function
  • the P-CSCF of the VPLMN is in a blacklist that does not support the VoLTE service function.
  • step 202 before the IMS core network device triggers the CSFB service of the UE, it is determined that the UE has been registered in the circuit switched domain. Specifically, the IMS core network device obtains, from the home subscriber server HSS or the home location register HLR, the information that the UE registers with the circuit-switched CS network, and determines whether the UE is based on the information that the UE registers with the CS network. Registered in the circuit switched domain. For example, the IMS core network device may query the HSS/HLR whether the UE has been registered in the CS network, and the Home Subscriber Server (HSS)/Home Location Register (HLR) according to the internally recorded corresponding UE.
  • HSS Home Subscriber Server
  • HLR Home Location Register
  • the location information of the CS network determines that the UE has registered with the CS network, and then responds to the IMS core network device that the UE has been registered in the CS network; or, the IMS core network device directly according to the UE corresponding to the UE obtained from the HSS/HLR
  • the location information of the CS network determines that the UE has been registered with the CS network.
  • the location information of the CS network corresponding to the UE recorded in the HSS/HLR may specifically be a Mobile Switching Center (MSC) number/name, a Visitor Location Register (VLR) number/name, and an MSC area ( MSC area) and so on.
  • MSC Mobile Switching Center
  • VLR Visitor Location Register
  • MSC area MSC area
  • the IMS core network device may trigger the CSFB service of the UE after determining that the UE has registered to the circuit switched domain, and when the IMS core network device determines that the UE has not registered to the circuit switched domain, Even if the IMS core network device determines that the VoLTE service cannot be established, the IMS core network device may not trigger the CSFB service of the UE. In this way, the CSFB service of the UE can be triggered after the UE has been registered in the circuit switched domain, ensuring that the CSFB service is successfully triggered. If the UE is not registered in the circuit switched domain, the CSFB service can no longer be triggered, thereby avoiding redundant triggering. Process, saving processing resources.
  • the UE may be a calling UE of a VoLTE service
  • the IMS core network device is a calling party I/S-CSCF or a calling party SCC AS or a calling party P-CSCF.
  • the UE It can also be the called UE.
  • the IMS core network device is the called party I/S-CSCF or the called party SCCAS or the called party P-CSCF.
  • the IMS core network device triggers the CSFB service of the UE, and the IMS core network device sends a first message to the calling UE, where the first message is sent.
  • the method is used to trigger the calling UE to initiate a circuit domain to fall back to the CSFB calling service.
  • the first message includes a first cause value, where the first cause value is used to notify the calling UE of the specific cause of the VoLTE service being unavailable, for example, the specific reason may be that the supplementary service is unavailable, and the VoLTE is caused.
  • the service is unavailable, or the VoLTE service that is not enabled by the VoLTE function on the network where the UE is located is unavailable.
  • the IMS core network device triggers the CSFB service of the UE, and the IMS core network device sends a second message to the called domain selection device, where the second message is used. Instructing the called domain selection device to trigger the circuit domain of the called UE to fall back to the CSFB called service.
  • the second message includes a second cause value, where the second cause value is used to notify the called domain selection device of the specific cause of the VoLTE service being unavailable, for example, the specific reason may be that the supplementary service is unavailable.
  • the VoLTE service is unavailable, or the VoLTE service is unavailable because the VoLTE function is not enabled on the network where the UE is located.
  • the calling party IMS core network device receives the VoLTE service request message sent by the calling UE, and if it is determined that the VoLTE service cannot be established, the calling UE is notified.
  • the VoLTE service is not available.
  • the calling UE after the originating UE initiates the VoLTE service request, if the corresponding response message of the VoLTE service sent by the corresponding calling IMS core network device is received, the calling UE automatically triggers the CSFB calling process, thereby The voice call service is set up in the domain, which can effectively avoid the problem that the user who has signed the VoLTE service may fail to roam to the service network that does not have the VoLTE function, and the stability of the VoLTE service is improved.
  • the user Supplementary industry in which the IMS network cannot be implemented Services can also be performed on the CS network, which helps to improve the user's business experience. For example, there are still many operators that build IMS networks that only provide VoLTE voice services.
  • the UE is a calling UE of a VoLTE service
  • the IMS core network device is a calling party I/S-CSCF or a calling party SCC AS or a calling party P-CSCF.
  • FIG. 3 is a schematic flowchart of a service processing method according to Embodiment 2 of the present application. As shown in FIG. 3, the method includes:
  • Step 301 The calling UE initiates establishment of a VoLTE service by sending an invite message.
  • the calling party P-CSCF receives the invite message from the calling UE, and after receiving the invite message, triggers the calling party P-CSCF to establish an IMS calling session for the calling UE.
  • Steps 302-303 the calling party P-CSCF sends the invite message to a subsequent IMS node (for example, an IMS node such as an I/S-CSCF and an SCC AS).
  • a subsequent IMS node for example, an IMS node such as an I/S-CSCF and an SCC AS.
  • Step 304 The calling party SCC AS obtains at least one supplementary service accompanying the VoLTE service, and determines that the at least one supplementary service is unavailable, and determines that the VoLTE service cannot be established.
  • the supplementary service may be triggered by the network side according to the subscription information of the UE.
  • the calling party SCC AS obtains the subscription data of the calling UE from the HSS, where the subscription data of the calling UE includes supplementary services (such as CRBT, call forwarding, etc.) that need to be provided to the calling UE along with the VoLTE calling service network side. ) related information.
  • the calling party SCC AS judges whether one or some supplementary services cannot be supported by the IMS network according to the related information of the supplementary service.
  • the supplementary service may also be initiated by the UE side.
  • the calling UE initiates an invite
  • the message requesting the establishment of a VoLTE call (specifically, the calling UE has sent an invite to request a VoLTE call, but has not received a ringing response), and the calling UE actively requests the network side to perform some supplementary services according to the user indication. (LCS, location service)
  • the calling UE sends the invite message again (that is, the supplementary service establishment request message), and the resented invite message is used to request the IMS network side to execute the supplementary service.
  • the calling party SCC AS determines whether the supplementary service requested by the calling UE can be supported by the IMS network according to the invite message sent by the calling UE again. For example, if the calling party SCCAS determines that the media requirement corresponding to one or some supplementary services described in the Session Description Protocol (SDP) offer in the invite message sent by the calling UE is not satisfied, the caller may determine the supplementary. The service is not supported and the VoLTE service cannot be established. It should be noted that, the operation of determining whether the VoLTE service can be established in the foregoing step 304 can also be performed by the calling party I/S-CSCF, and the specific execution process is similar to the execution process of the AS, and details are not described herein again.
  • SDP Session Description Protocol
  • step 305 the calling party SCC AS replies to the calling party I/S-CSCF with a 380/503 response message, and the calling party I/S-CSCF delivers the 380/503 response message to the calling party P-CSCF.
  • the calling party SCC AS further needs to determine that the calling UE has already registered in the circuit switched domain.
  • the specific determining method refer to Embodiment 1. That is to say, the calling party SCC AS performs step 305 and subsequent operations only if it is determined that the calling UE is already registered in the circuit switched domain, otherwise it is not executed.
  • Step 306 the calling party P-CSCF sends a 380/503 response message to the calling UE.
  • the 380/503 response message is used to indicate that the current VoLTE service is unavailable.
  • the 380/503 response message is only an example. It can also be a response message of another name. Specifically, it can decide which response message to send according to the operator policy and the UE configuration information.
  • the IMS core network device may send different response messages according to different VPLMNs where the calling UE is located, for example, sending 380 messages for UEs in the A network and 503 messages for UEs of the B network.
  • the called party P-CSCF further needs to determine that the called UE corresponding to the calling UE is in a pre-altering state, that is, the called party P-CSCF only Step 306 is performed only after determining that the called UE corresponding to the calling UE is in a pre-ringing state. And subsequent operations, otherwise not implemented, so that the user's non-perception can be achieved.
  • Step 307 after receiving the 380/503 message sent by the calling party P-CSCF, the calling UE can re-call the domain selection and initiate a CSFB call.
  • the UE side and the network side cooperate to perform the CSFB process, and finally establish a voice call in the CS domain. If there is a supplementary service, the supplementary service accompanying the voice service is re-established in the CS domain.
  • the supplementary service of the CS domain is re-established in the CS domain, and the core network device of the CS domain may learn, according to the subscription data, which supplementary services need to be performed along with the voice service.
  • the CS domain core network device In the CS voice call establishment process, the CS domain core network device simultaneously Trigger the execution of supplementary services.
  • the supplementary service accompanying the voice service is re-established in the CS domain, and the calling UE may know that the supplementary service failure requested by the LTE network is established after the CSFB is dropped to the CS domain, and the voice call may be established in the CS domain. Supplementary business of VoLTE business.
  • the calling party P-CSCF can also determine whether the VoLTE service can be established. The method for determining is similar to the step 304, and details are not described herein again. If the calling party P-CSCF determines that the VoLTE service cannot be established, the P-CSCF may directly perform step 306, omitting steps 302 to 305. Optionally, before the step 306, the calling party P-CSCF further needs to determine that the calling UE has already registered in the circuit switched domain. For the specific determining method, refer to Embodiment 1. That is to say, the calling party P-CSCF performs step 306 and subsequent operations only if it is determined that the calling UE has registered in the circuit switched domain, otherwise it is not executed.
  • the IMS core network device rejects the calling UE to initiate in the scenario that the calling party UE initiates the supplementary service initiated by the VoLTE voice service.
  • the VoLTE call request thereby converting the VoLTE call to a CSFB call.
  • the technical solution in the embodiment of the present application is used to ensure that when the network side does not support the VoLTE call initiated by the UE and includes some special supplementary services, the VoLTE service call can be converted into a CSFB call, and at least the voice requested by the UE is guaranteed. The service, and the UE does not perceive this, guarantees a good user experience.
  • the UE is a called UE of a VoLTE service, and correspondingly, an IMS
  • the core network device is the called party I/S-CSCF or the called party SCC AS or the called party P-CSCF.
  • FIG. 4 is a schematic flowchart diagram of a service processing method according to Embodiment 3 of the present application. As shown in FIG. 4, the method includes:
  • Step 401 The called party I/S-CSCF receives an invite message sent to the called UE, and after receiving the invite message, triggers the called party I/S-CSCF to establish an IMS called session for the called UE.
  • step 402a the called party I/S-CSCF sends the invite message to the called party SCC AS.
  • step 402b the called party SCC AS performs the called domain selection function, and selects the called session domain to the PS domain.
  • step 402c the called party SCC AS sends an invite message to the called party I/S-CSCF.
  • step 403 the called party I/S-CSCF sends the invite message to the called party P-CSCF.
  • Steps 404a-c the called party P-CSCF forwards an invite message to the called UE (step 404a), and the called UE replies with a 183 response message (step 404c), and then, the 183 response message is forwarded by the P-CSCF to the called party I. /S-CSCF and called party SCC AS.
  • Step 405 After the called party SCC AS acquires at least one supplementary service that is associated with the VoLTE service, and determines that the at least one supplementary service is unavailable, it is determined that the VoLTE service cannot be established.
  • the supplementary service may be triggered by the network side according to the subscription information of the UE.
  • the called party SCC AS obtains subscription data of the called UE from the HSS, where the subscription data of the called UE includes supplementary services (such as CRBT, call forwarding, etc.) that need to be provided to the called UE along with the VoLTE call service network side. ) related information.
  • the called party SCC AS judges whether one or some supplementary services cannot be supported by the IMS network according to the related information of the supplementary service.
  • the supplementary service may also be initiated by the UE side.
  • the called UE actively sends an invite message (that is, a supplementary service setup request message), and the sent invite message is used to request the IMS network side to perform the Supplementary business.
  • the called party SCC AS determines, according to the invite message sent by the called UE, whether the supplementary service requested therein can be supported by the IMS network.
  • the called party SCC AS determines that the media requirement corresponding to one or some supplementary services described by the SDP offer in the invite message sent by the called UE is not If it can be satisfied, it can be determined that the supplementary service is not supported and the VoLTE service cannot be established.
  • step 405 the operation of determining whether the VoLTE service can be established in the foregoing step 405 may also be performed by the called party I/S-CSCF after receiving the invite message in step 401, and the specific execution process is similar to the execution process of the AS. , will not repeat them here.
  • Step 406 The called party SCC AS replies to the called domain selection device with a 380/503 response message.
  • the response message sent by the called party SCC AS to the called domain selection device may also be other response messages.
  • the 380 and 503 response messages are only examples, and the specific sent response message may be set according to the carrier configuration information.
  • the called party I/S-CSCF performs the determining operation of step 405, after determining that the VoLTE service cannot be established, the called party I/S-CSCF sends a 380/503 message response message. Select the device to the called domain.
  • the called party SCC AS further needs to determine that the called UE has already registered in the circuit switched domain.
  • the called party SCC AS performs step 406 and subsequent operations only if it is determined that the called UE has already registered in the circuit switched domain, otherwise it is not executed.
  • the called party P-CSCF further needs to determine that the called UE is in a pre-altering state (that is, the called party P-CSCF only determines that the called UE is in the Step 406 and subsequent operations are performed only in the case of the pre-ringing state, otherwise it is not executed, so that the user's non-perception can be realized.
  • Step 407 If the step S404 is performed, after determining that the VoLTE service cannot be established, the called party SCC AS sends a cancel message to the called UE to cancel the already requested VoLTE service related session. The execution of S406 and S407 does not limit the relationship.
  • step 405 is performed by the called party I/S-CSCF
  • step 405 should also be performed by the called party I/S-CSCF.
  • Steps 408a-408b the called domain selection device re-selects the called session to the CS domain, and initiates a call to the CS domain call control device (such as the MSC) via the called party I/S-CSCF.
  • the CS domain call control device such as the MSC
  • step 409 the CS domain call control device (such as the MSC) initiates a call to the MME via the SGs interface.
  • the CS domain call control device such as the MSC
  • Step 410 The MME triggers the CSFB process of the called UE.
  • the called UE After the CSFB process of the called UE, the called UE finally establishes a voice session in the CS domain. If there is a supplementary service, the supplementary service accompanying the voice service is re-established in the CS domain.
  • step 403 the operation of step 405 can also be performed by the called party P-CSCF, and the operation manner is similar to step 405, and details are not described herein again.
  • the called party P-CSCF directly performs step 406, and steps 404 and 407 are omitted.
  • the called party P-CSCF further needs to determine that the called UE has been registered in the circuit switched domain. For the specific determining method, refer to the first embodiment. That is to say, the called party P-CSCF performs step 406 and subsequent operations only if it is determined that the UE has been registered in the circuit switched domain, otherwise it is not executed.
  • the IMS core network device determines that at least one supplementary service cannot be supported, the IMS core network device re-selects the call. To the CS domain, triggering the CSFB call flow to the called UE.
  • the technical solution in the embodiment of the present application is used to ensure that when the network side does not support the VoLTE service of the UE with certain special supplementary services, the VoLTE service can be converted into a CSFB service, and at least the voice service requested by the UE is guaranteed. And the UE does not perceive this, which guarantees a good user experience.
  • the UE is a calling UE of a VoLTE service
  • the IMS core network device is a calling party S-CSCF or a calling party SCC AS or a calling party P-CSCF.
  • FIG. 5 is a schematic flowchart diagram of a service processing method according to Embodiment 4 of the present application. As shown in FIG. 5, the method includes:
  • Step 501 The calling UE initiates establishment of a VoLTE service by sending an invite message.
  • the calling party P-CSCF receives the invite message from the calling UE, and after receiving the invite message, triggers the calling party P-CSCF to establish an IMS calling session for the calling UE.
  • Steps 502-503 the calling party P-CSCF sends the invite message to a subsequent IMS node (for example, an IMS node such as an S-CSCF and an SCC AS).
  • a subsequent IMS node for example, an IMS node such as an S-CSCF and an SCC AS.
  • Step 504 After the calling party SCC AS determines that the serving network where the UE is currently located does not support the VoLTE service, it is determined that the VoLTE service cannot be established.
  • the calling party SCC AS determines that the service network in which the UE is currently located does not support the VoLTE service, that is, the VPLMN service in which the UE is located does not activate the VoLTE service function, or the VPLMN where the UE is located and the home land mobile network HPLMN.
  • the VoLTE service roaming agreement was not signed between.
  • the calling party SCC AS can obtain the address of the calling party P-CSCF from the received Invite message, and learn the VPLMN to which the calling party P-CSCF belongs according to the address of the calling party P-CSCF, if it is determined that the VPLMN is not present.
  • the network whitelist that has been enabled with the VoLTE function, or the VPLMN does not support the VoLTE roaming protocol in the blacklist of the VoLTE function or the VPLMN and the HPLMN, it is determined that the service network currently in the UE does not support the VoLTE service.
  • the calling party SCC AS can also obtain the address of the calling party P-CSCF from the received Invite message, and directly judge according to the address of the calling party P-CSCF, if it is determined that the calling party P-CSCF is not supporting the VoLTE service. In the whitelist, or after the calling party P-CSCF does not support the blacklist of the VoLTE service, it determines that the network where the calling party P-CSCF is located (ie, the VPLMN) does not support the VoLTE service of the HPLMN.
  • the network where the calling party P-CSCF is located ie, the VPLMN
  • step 504 the operation of determining whether the VoLTE service can be established may also be performed by the calling party S-CSCF, and the specific execution process is similar to the execution process of the AS, and details are not described herein again.
  • Step 505 the calling party SCC AS replies to the calling party S-CSCF with a 380/503 response message, and the calling party S-CSCF delivers the 380/503 response message to the calling party P-CSCF.
  • the calling party SCC AS before the step 505, the calling party SCC AS also needs to determine that the calling UE has been registered in the circuit switched domain.
  • the specific determination method refer to Embodiment 1. That is to say, the calling party SCC AS performs step 505 and subsequent operations only if it is determined that the calling UE has registered in the circuit switched domain, otherwise it is not executed.
  • step 506 the calling party P-CSCF sends a 380/503 response message to the calling UE.
  • the 380/503 response message is used to indicate that the current VoLTE service is unavailable.
  • the 380/503 response message is only an example. It can also be a response message of another name. Specifically, it can decide which response message to send according to the operator policy and the UE configuration information.
  • the IMS core network device may send different response messages according to different VPLMNs where the calling UE is located, for example, sending 380 messages for UEs in the A network and 503 messages for UEs of the B network.
  • the called party P-CSCF further needs to determine that the called UE corresponding to the calling UE is in a pre-altering state, that is, the called party P-CSCF only Step 506 and subsequent operations are performed only when it is determined that the called UE corresponding to the calling UE is in a pre-ringing state, otherwise it is not executed, so that the user's non-perception can be implemented.
  • Step 507 after receiving the 380/503 message sent by the calling party P-CSCF, the calling UE may re-call the domain selection and initiate a CSFB call.
  • the UE side and the network side cooperate to perform the CSFB process, and finally establish a voice call in the CS domain.
  • the calling party P-CSCF can also determine whether the VoLTE service can be established. Specifically, in step 504, the calling party P-CSCF needs to determine whether it supports the VOLTE service. Whether the VPLMN in which it is located supports VOLTE services. If the calling party P-CSCF determines that the VoLTE service cannot be established, the P-CSCF may directly perform step 506, omitting steps 502 to 505. Optionally, before the step 506, the calling party P-CSCF needs to determine that the calling UE has already registered in the circuit switched domain. For the specific determination method, refer to Embodiment 1. That is to say, the calling party P-CSCF performs step 506 and subsequent operations only if it is determined that the calling UE has registered in the circuit switched domain, otherwise it is not executed.
  • the IMS core network device determines that the calling party UE initiates a VoLTE call in the VPLMN and the VPLMN does not support the VoLTE call flow. For example, the IMS core network device determines that the VPLMN function has not been activated by the VPLMN, or between the VPLMN and the HPLMN where the IMS is located. After the roaming agreement is not signed, the IMS core network rejects the VoLTE call request initiated by the calling UE, thereby causing the VoLTE call to be converted into a CSFB call.
  • the technical solution in the embodiment of the present application is used to ensure that the calling UE can use the CSFB call instead of the VoLTE service call in the scenario of the calling voice session establishment in the scenario that the VOLMN function is not activated by the calling UE.
  • the UE is a called UE of a VoLTE service
  • the IMS core network device is a called party I/S-CSCF or a called party SCC AS or a called party P-CSCF.
  • FIG. 6 is a schematic flowchart diagram of a service processing method according to Embodiment 5 of the present application. As shown in FIG. 6, the method includes:
  • Step 601 The called party I/S-CSCF receives an invite message sent to the called UE, and after receiving the invite message, triggers the called party I/S-CSCF to establish an IMS called session for the called UE.
  • step 602a the called party I/S-CSCF sends the invite message to the called party SCC AS.
  • step 602b the called party SCC AS performs the called domain selection function, and selects the called session domain to the PS domain.
  • step 602c the called party SCC AS sends an invite message to the called party I/S-CSCF.
  • step 603 the called party I/S-CSCF sends the invite message to the called party P-CSCF.
  • Steps 604a-c the called party P-CSCF forwards the invite message to the called UE (step 604a), and the called UE replies with the 183 response message (step 604c), and then, the 183 response message is forwarded by the P-CSCF to the called party I. /S-CSCF and called party SCC AS.
  • Step 605 After the called party SCC AS determines that the service network where the UE is currently located does not support the VoLTE service, it is determined that the VoLTE service cannot be established.
  • the called party SCC AS determines that the service network in which the UE is currently not supporting the VoLTE service means that the VPLMN service where the UE is located does not activate the VoLTE service function or the VoLTE service roaming agreement is not signed between the VPLMN and the HPLMN where the UE is located.
  • the called party SCC AS may obtain the address of the called party P-CSCF in the IMS registration process of the called UE, or obtain the address of the called party P-CSCF from the 183 response message sent by the called UE. And the VPLMN to which the called party P-CSCF belongs is obtained according to the address of the called party P-CSCF.
  • the VPLMN is not in the network white list of the VoLTE function, or the VPLMN is not in the blacklist of the VoLTE function, or the VPLMN and VoLTE is not signed between HPLMN
  • the roaming protocol, or the called party P-CSCF is not in the whitelist supporting the VoLTE service, or the called party P-CSCF does not support the VoLTE service in the blacklist that does not support the VoLTE service.
  • the called party SCC AS obtains the address of the called party P-CSCF in the IMS registration process of the called UE, the called party SCC AS can determine the location of the called UE after receiving the invite message in step 602.
  • the VPLMN does not support the VoLTE service of the HPLMN, that is, after the step 602, the operation of step 605 is directly performed by using the solution, and steps 603 and 604 can be omitted.
  • the called party SCC AS may also obtain the VPLMN that the called UE is currently registered with the HSS/HLR.
  • the VPLMN may be included in a cell such as an MME identity or an APN. If it is determined that the VPLMN is not in the network white list of the VoLTE function, or the VPLMN is not in the blacklist of the VoLTE function, or the VoLTE roaming protocol is not signed between the VPLMN and the HPLMN, the network where the called party P-CSCF is located is determined ( That is, VPLMN) does not support the VoLTE service of HPLMN. Similarly, after step 602, the called party SCC AS directly performs the operation of S605 by using this scheme, and steps 603 and 604 can be omitted.
  • step 605 the operation of determining whether the VoLTE service can be established in the foregoing step 605 may also be performed by the called party I/S-CSCF after receiving the invite message in step 601, and the specific execution process is similar to the execution process of the AS. , will not repeat them here.
  • Step 606 The called party SCC AS replies to the called domain selection device with a 380/503 response message.
  • the response message sent by the called party SCC AS to the called domain selection device may also be other response messages.
  • the 380 and 503 response messages are only examples, and the specific sent response message may be set according to the carrier configuration information.
  • the called party I/S-CSCF performs the determining operation of step 605
  • the called party I/S-CSCF sends a 380/503 message response message. Select the device to the called domain.
  • the called party SCC AS further needs to determine that the called UE is already registered in the circuit switched domain.
  • the called party SCC AS performs step 606 and subsequent operations only if it is determined that the UE has registered in the circuit switched domain, Then it will not be executed.
  • the called party P-CSCF further needs to determine that the called UE is in a pre-altering state (that is, the called party P-CSCF only determines that the called UE is in the Step 606 and subsequent operations are performed only in the case of the pre-ringing state, otherwise it is not executed, so that the user's non-perception can be realized.
  • a pre-altering state that is, the called party P-CSCF only determines that the called UE is in the Step 606 and subsequent operations are performed only in the case of the pre-ringing state, otherwise it is not executed, so that the user's non-perception can be realized.
  • Step 607 If the step S604 is performed, after determining that the VoLTE service cannot be established, the called party SCC AS sends a cancel message to the called UE to cancel the already requested VoLTE service related session.
  • the execution of S606 and S607 does not limit the relationship.
  • step 605 is performed by the called party I/S-CSCF
  • step 607 should also be performed by the called party I/S-CSCF.
  • Steps 608a-608b the called domain selection device re-selects the called session to the CS domain, and initiates a call to the CS domain call control device (such as the MSC) via the called party I/S-CSCF.
  • the CS domain call control device such as the MSC
  • step 609 the CS domain call control device (such as the MSC) initiates a call to the MME via the SGs interface.
  • the CS domain call control device such as the MSC
  • step 610 the MME triggers the CSFB process of the called UE.
  • the called UE After the CSFB process of the called UE, the called UE finally implements establishing a voice session in the CS domain.
  • step 605 the operation of step 605 may also be performed by the called party P-CSCF. Specifically, in step 605, the called party P-CSCF needs to determine whether it supports the VOLTE service, or is located in itself. Does the VPLMN support VOLTE services? If it is determined that the VoLTE service cannot be established, the called party P-CSCF directly performs step 606, and steps 604 and 607 are omitted.
  • the called party P-CSCF needs to determine that the called UE has already registered in the circuit switched domain.
  • the called party P-CSCF performs step 606 and subsequent operations only if it is determined that the UE has been registered in the circuit switched domain, otherwise it is not executed.
  • the IMS core network device determines that the VTLMN where the called UE is located in the VoLTE service does not support the VoLTE call flow. For example, after determining that the VPLMN function has not been activated for the VPLMN, or the RPM is not signed between the VPLMN and the HPLMN where the IMS is located, the IMS Core network equipment will The call re-domain is selected to the CS domain, thereby triggering the CSFB call flow to the called UE.
  • the technical solution in the embodiment of the present application is used to ensure that the UE that has subscribed to the VoLTE service can use the CSFB call to replace the VoLTE service in the called voice session establishment phase in the scenario where the VPLMN function of the VoLTE function is not called.
  • the called party ensures that the UE is called the success rate, and the UE does not perceive this, ensuring a good user experience.
  • the UE is a calling UE of a VoLTE service
  • the IMS core network device is a calling party S-CSCF or a calling party SCC AS or a calling party P-CSCF.
  • FIG. 7 is a schematic flowchart diagram of a service processing method according to Embodiment 6 of the present application. As shown in FIG. 7, the method includes:
  • step 701 the calling UE initiates establishment of a VoLTE service by sending an invite message.
  • the calling party P-CSCF receives the invite message from the calling UE, and after receiving the invite message, triggers the calling party P-CSCF to establish an IMS calling session for the calling UE.
  • Steps 702-703 the calling party P-CSCF sends the invite message to a subsequent IMS node (for example, an IMS node such as an S-CSCF and an SCC AS).
  • a subsequent IMS node for example, an IMS node such as an S-CSCF and an SCC AS.
  • the calling party P-CSCF sends an Authentication Authorization Request (AAR) to the EPC network device (such as a PCRF) to trigger the establishment of the voice-specific bearer.
  • AAR may carry a user identifier of the calling UE, an IMS application layer charging identifier, and media description information.
  • the media description information may include at least one of the following information: a classifier identifier, bandwidth requirement description information, media type description information, and QoS parameters.
  • the calling party P-CSCF After the calling party P-CSCF sends the AAR message, if the calling party P-CSCF receives a re-authentication request (RAR, Re-authentication Request) message/session suspension request sent by an EPC network device (such as a PCRF) (ASR)
  • RAR re-authentication request
  • ASR ASR
  • An Abort-Session-Request message the RAR message/ASR message may carry indication information indicating that the bearer resource is insufficient or indication information indicating that the resource allocation fails, and the calling party P-CSCF may determine the voice.
  • the UE is in a weak coverage area of the PS domain.
  • steps 704a-704b may also be performed before the step 702 or the step 703.
  • the foregoing step numbers are only an exemplary representation of the execution order, and the specific execution order is not specifically limited in the embodiment of the present application.
  • Step 705 The calling party P-CSCF sends a 380/503 response message to the calling UE.
  • the calling party P-CSCF further needs to determine that the calling UE has been registered in the circuit switched domain.
  • the specific determination method refer to Embodiment 1. That is to say, the calling party P-CSCF performs step 705 and subsequent operations only if it is determined that the calling UE has registered in the circuit switched domain, otherwise it is not executed.
  • the 380/503 response message is used to indicate that the current VoLTE service is unavailable.
  • the 380/503 response message is only an example. It can also be a response message of another name. Specifically, it can decide which response message to send according to the operator policy and the UE configuration information.
  • the calling party P-CSCF further needs to determine that the called UE corresponding to the calling UE is in a pre-altering state, that is, the calling party P-CSCF is only in the Step 705 and subsequent operations are performed only when the called UE is in the pre-ringing state, otherwise it is not executed, so that the user's non-perception can be realized.
  • Step 706 After receiving the 380/503 message sent by the calling party P-CSCF, the calling UE may re-call the domain selection and initiate a CSFB call. The UE side and the network side cooperate to perform the CSFB process, and finally establish a voice call in the CS domain.
  • the IMS core network device determines that the voice-specific bearer corresponding to the calling VoLTE service cannot be established in the PS domain
  • the IMS core network rejects the VoLTE call request initiated by the calling UE, thereby causing the VoLTE call to be converted into a CSFB call.
  • the technical solution in the embodiment of the present application is used to ensure that the UE can use the CSFB call instead of the VoLTE service call in the scenario of the establishment of the calling voice session in the scenario that the voice private bearer corresponding to the calling VoLTE service cannot be established.
  • the success rate of the initiated call, and the UE does not perceive this, ensuring a good user experience.
  • the UE is a called UE of a VoLTE service, and correspondingly, the IMS core network device is a called party P-CSCF.
  • FIG. 8 is a schematic flowchart of a service processing method according to Embodiment 6 of the present application. As shown in FIG. 7, the method includes:
  • Step 801 The called party I/S-CSCF receives an invite message sent to the called UE, and after receiving the invite message, triggers the called party I/S-CSCF to establish an IMS called session for the called UE.
  • Step 802 the called party I/S-CSCF sends the invite message to the called party SCC AS.
  • step 802a the called party SCC AS performs the called domain selection function, and selects the called session domain to the PS domain.
  • step 802b the called party SCC AS sends an invite message to the called party I/S-CSCF.
  • step 803 the called party I/S-CSCF sends the invite message to the called party P-CSCF.
  • Steps 804a-c the called party P-CSCF forwards an invite message to the called UE (step 804a), and the called UE replies with a 183 response message (step 804b), and then, the 183 response message is forwarded by the P-CSCF to the called party I. /S-CSCF and called party SCC AS.
  • the called party P-CSCF sends an authentication authorization request (AAR) to the EPC network device (such as a PCRF) to trigger the establishment of the voice-specific bearer.
  • AAR authentication authorization request
  • the AAR may carry a user identifier of the called UE, an IMS application layer charging identifier, media description information, and the like.
  • the media description information may include at least one of the following information: a classifier identifier, bandwidth requirement description information, media type description information, and QoS parameters.
  • the called party P-CSCF After the called party P-CSCF sends the AAR message, if the called party P-CSCF receives a re-authentication request (RAR) message/session abort request (ASR) sent by an EPC network device (such as a PCRF)
  • RAR re-authentication request
  • ASR session abort request
  • Step 806 the called party P-CSCF replies to the called party SCC AS with a 380/503 response message, and the 380/503 message includes indication information indicating that the called service establishment fails in the PS domain.
  • the response message sent by the called party P-CSCF to the called party SCC AS may also be other response messages.
  • the 380 and 503 response messages are only examples, and the specific sent response message may be set according to carrier configuration information and the like.
  • the called party P-CSCF may reply the 380/503 response message to the called party SCC AS via the called party S-CSCF.
  • the called party P-CSCF needs to determine that the called UE has already registered in the circuit switched domain.
  • the called party P-CSCF performs step 806 and subsequent operations only if it is determined that the UE has been registered in the circuit switched domain, otherwise it is not executed.
  • the called party P-CSCF further needs to determine that the called UE is in a pre-altering state (that is, the called party P-CSCF only determines that the called UE is in the Step 806 and subsequent operations are performed only in the case of the pre-ringing state, otherwise it is not executed, so that the user's non-perception can be realized.
  • Steps 807a-807b the called party SCC AS performs the called domain selection function, re-selects the called session to the CS domain, and calls the control device to the CS domain via the called party I/S-CSCF and the like (eg, MSC) initiates a call.
  • step 808 the CS domain call control device (such as the MSC) initiates a call to the MME via the SGs interface.
  • the CS domain call control device such as the MSC
  • step 809 the MME triggers the CSFB process of the called UE.
  • the called UE After the CSFB process of the called UE, the called UE finally implements establishing a voice session in the CS domain.
  • the called IMS core network device determines that the voice-specific bearer corresponding to the called VoLTE service cannot be established in the PS domain, and the called IMS core network device re-selects the called domain to the CS domain. Thereby triggering the CSFB call flow to the called UE.
  • the technical solution in the embodiment of the present application is beneficial to ensure that when the called UE cannot perform the called VoLTE service, the CSFB callee can be used instead of the VoLTE service called in the called voice session establishment phase to ensure that the UE is successfully called. Rate, and the UE does not perceive this, ensuring a good user experience.
  • the embodiment of the present application further provides an IMS core network device, and the specific content of the device may be implemented by referring to the foregoing method.
  • the IMS core network device 900 includes:
  • the transceiver module 901 is configured to receive a request message for establishing, by the user equipment UE, a long term evolution network voice transmission VoLTE service in a packet switched PS domain;
  • the processing module 902 is configured to determine that the circuit domain of the UE is triggered to fall back the CSFB service after the VoLTE service cannot be established in the PS domain.
  • the processing module 902 is specifically configured to: after determining that at least one of the following conditions is determined, determine that the VoLTE service cannot be established in the PS domain:
  • the processing module 902 obtains at least one supplementary service that is accompanied by the VoLTE service by:
  • the processing module 902 is specifically configured to: determine, by using the following manner, that the service network where the UE is currently not supporting the VoLTE service: determining the visited public land mobile network where the UE is located The VLTMN does not activate the VoLTE service function or the VoLTE service roaming agreement is not signed between the VPLMN where the UE is located and the home public land mobile network HPLMN.
  • the processing module 902 is specifically configured to: after determining that at least one of the following conditions is determined, determining that the visited public land mobile network VPLMN where the UE is located does not activate the VoLTE service function:
  • the VPLMN is not in a network white list in which the VoLTE service function has been activated;
  • the VPLMN is in a blacklist in which the VoLTE service function is not activated
  • VoLTE roaming agreement is not signed between the VPLMN and the home public land mobile network HPLMN;
  • the proxy-call session control function P-CSCF of the VPLMN is not in the white list supporting the VoLTE service function;
  • the P-CSCF of the VPLMN is in a blacklist that does not support the VoLTE service function.
  • processing module 902 is specifically configured to determine, by using the following manner, that the voice bearer establishment failure of the VoLTE service in the PS domain is:
  • the RAR message or the ASR message includes a cause value of the voice bearer establishment failure of the VoLTE service.
  • the cause of the failure of the voice bearer setup of the VoLTE service included in the RAR message or the ASR message is that the UE is in a weak coverage area of the PS domain.
  • the method is further configured to:
  • the processing module is specifically configured to determine that the UE is registered in a circuit switched domain by:
  • the UE is a calling UE of a VoLTE service
  • the processing module 902 is specifically configured to trigger the CSFB service of the UE by:
  • the transceiver module 901 And sending, by the transceiver module 901, the first message to the calling UE, where the first message is used to trigger the calling UE to initiate a circuit domain to fall back to the CSFB calling service.
  • the first message includes a first cause value, where the first cause value is used to notify the calling UE of a specific cause that the VoLTE service is unavailable.
  • processing module 902 is further configured to: before the sending, by the transceiver module 901, the first message to the calling UE:
  • the IMS core network device serves as a calling party service call session control function I/S-CSCF or a calling party service centralization and continuity application server SCC AS or a calling party agent-call session control function P-CSCF .
  • the UE is a called UE of a VoLTE service
  • the processing module 902 is specifically configured to trigger the CSFB service of the UE by:
  • the second message includes a second cause value, where the second cause value is used to notify the called domain selection device of a specific reason for the called establishment failure of the PS domain.
  • the processing module 902 before the sending, by the transceiver module 901, the processing module 902 sends the second message to the called domain selection device, the processing module 902 is further configured to:
  • the IMS core network device serves the called party service call session control function I/S-CSCF or called party service centralization and continuity application server SCC AS or called party agent-call session control Function P-CSCF.
  • the processing module 902 sends a second message to the called domain selection device by using the transceiver module 901, specifically:
  • the processing module 902 of the called party P-CSCF sends the second message to the called party I/S-CSCF through the transceiver module 901, so that the called party I/S-CSCF will The second message is forwarded to the called domain selection device.
  • the IMS core network device receives a request message for establishing a VoLTE service for the UE, and after determining that the VoLTE service cannot be established, the IMS core network device triggers the CSFB service of the UE, so that when the VoLTE service cannot be established, The CSFB service of the UE is directly triggered, and the VoLTE service is not required to be established, thereby improving the success rate of the user equipment, ensuring the voice service and the supplementary service requested by the UE, ensuring a good user experience, and avoiding the UE being unable to use the VoLTE service. And the technical problem of processing time.
  • FIG. 10 is a schematic structural diagram of another IMS core network device according to an embodiment of the present application, where the IMS core network device 1000 includes: a communication interface 1001, a processor 1002, and a memory 1003. Bus system 1004;
  • the memory 1003 is configured to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1003 may be a random access memory (RAM) or a non-volatile memory, such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed.
  • the memory 1003 can also be a memory in the processor 1002.
  • the memory 1003 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
  • Operation instructions include various operation instructions for implementing various operations.
  • Operating system Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.
  • the processor 1002 controls the operation of the IMS core network device 1000, which may also be referred to as CPU (Central Processing Unit).
  • the components of the IMS core network device 1000 are coupled together by a bus system 1004.
  • the bus system 1004 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus.
  • various buses are labeled as bus system 1004 in the figure. For ease of representation, only the schematic representation is shown in FIG.
  • the method disclosed in the foregoing embodiment of the present application may be applied to the processor 1002 or implemented by the processor 1002.
  • the processor 1002 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1002 or an instruction in a form of software.
  • the processor 1002 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1003, and the processor 1002 reads the information in the memory 1003 and performs the following steps in conjunction with its hardware:
  • the processor 1002 is specifically configured to: after determining that the following at least one condition exists, determine that the VoLTE service cannot be established in the PS domain:
  • the processor 1002 obtains at least one supplementary service accompanying the VoLTE service by:
  • the processor 1002 is specifically configured to: determine, by using the following manner, that the service network where the UE is currently located does not support the VoLTE service: determining that the public land mobile network VPLMN where the UE is located does not activate the VoLTE service function or the location The VoLTE service roaming agreement is not signed between the VPLMN where the UE is located and the home land mobile network HPLMN.
  • the processor 1002 is specifically configured to: after determining that at least one of the following conditions is determined, determining that the visited public land mobile network VPLMN where the UE is located does not activate the VoLTE service function:
  • the VPLMN is not in a network white list in which the VoLTE service function has been activated;
  • the VPLMN is in a blacklist in which the VoLTE service function is not activated
  • VoLTE roaming agreement is not signed between the VPLMN and the home public land mobile network HPLMN;
  • the proxy-call session control function P-CSCF of the VPLMN is not in the white list supporting the VoLTE service function;
  • the P-CSCF of the VPLMN is in a blacklist that does not support the VoLTE service function.
  • the processor 1002 is specifically configured to determine, by using the following manner, that the voice bearer establishment failure of the VoLTE service in the PS domain is:
  • the RAR message or the ASR message includes a cause value of the voice bearer establishment failure of the VoLTE service.
  • the cause of the failure of the voice bearer setup of the VoLTE service included in the RAR message or the ASR message is that the UE is in a weak coverage area of the PS domain.
  • the processor 1002 before the processor 1002 triggers the CSFB service of the UE, the processor 1002 is further configured to:
  • the processor 1002 is specifically configured to determine that the UE is registered in a circuit switched domain by:
  • the UE is a calling UE of a VoLTE service
  • the processor 1002 is specifically configured to trigger the CSFB service of the UE by:
  • the first message includes a first cause value, where the first cause value is used to notify the calling UE of a specific cause that the VoLTE service is unavailable.
  • the processor 1002 before the sending, by the processor 1002, the first message to the calling UE by using the communications interface 1001, the processor 1002 is further configured to:
  • the IMS core network device serves as a calling party service call session control function I/S-CSCF or a calling party service centralization and continuity application server SCC AS or a calling party agent-call session control function P-CSCF .
  • the UE is a called UE of a VoLTE service
  • the processor 1002 is specifically configured to trigger the CSFB service of the UE by:
  • the second message includes a second cause value, where the second cause value is used to notify the called domain selection device of a specific reason for the called establishment failure of the PS domain.
  • the processor 1002 before the processor 1002 sends the second message to the called domain selection device by using the communication interface 1001, the processor 1002 is further configured to:
  • the IMS core network device serves the called party service call session control function I/S-CSCF or the called party service centralization and continuity application server SCC AS or the called party agent-call session control function P-CSCF .
  • the processor 1002 sends a second message to the called domain selection device by using the communication interface 1001, specifically:
  • the processor 1002 of the called party P-CSCF sends the second message to the called party I/S-CSCF through the communication interface 1001, so that the called party I/S-CSCF will The second message is forwarded to the called domain selection device.
  • the IMS core network device receives the request message for establishing the VoLTE service for the UE, and after determining that the VoLTE service cannot be established, the IMS core network device triggers the CSFB service of the UE, so that the VoLTE cannot be established.
  • the CSFB service of the UE is directly triggered, and the VoLTE service is not required to be established, thereby improving the success rate of the user equipment, ensuring the voice service and the supplementary service requested by the UE, ensuring a good user experience, and avoiding the UE being unable to The technical problem of using the VoLTE service to be connected and consuming processing time.
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer usable memory channels (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.
  • the present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
  • the computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine instruction for generating instructions executed by a processor of a computer or other programmable data processing device Means for implementing the functions specified in one or more flows of the flowchart or in a block or blocks of the flowchart.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种业务处理方法及装置，包括：IMS核心网设备接收为UE建立VoLTE业务的请求消息，IMS核心网设备确定无法建立所述VoLTE业务后，触发UE的CSFB语音业务，从而使得在无法建立VoLTE业务的情况下，直接触发UE的CSFB语音业务，而无需再尝试建立VoLTE业务，进而提高用户设备语音业务的接通成功率，保证UE请求的语音业务和补充业务，确保良好的用户体验，避免导致UE无法使用VoLTE业务接通且耗费处理时间的技术问题。

Description

一种业务处理方法及装置 技术领域
本申请涉及通信技术领域，尤其涉及一种业务处理方法及装置。
背景技术
长期演进(Long Term Evolution，LTE)网络的语音业务被称为长期演进网络语音传输(Voice over LTE，VoLTE)业务，目前越来越多的运营商开始商用VoLTE，且越来越多的用户设备(User Equipment，UE)能够支持VoLTE业务。VoLTE是一种基于IP(Internet Protocol，互联网协议)数据传输的语音技术，全部业务承载于LTE网络上，可实现数据与语音业务在同一网络下的统一。
与传统的电路交换域语音业务相比，当前VoLTE业务还并不能全面支持各种伴随语音呼叫的补充业务，例如，原个性化彩铃业务、呼叫转移业务、语音信箱业务等可能不被支持。同时，在某些还未全面面向用户开通VoLTE业务的网络，当签约了VoLTE业务的用户漫游至未开通VoLTE业务的网络覆盖范围下时，则会出现VoLTE业务无法使用，严重影响用户通话质量。
发明内容
本申请提供一种业务处理方法及装置，用于解决在无法建立VoLTE业务的情况下，仍尝试建立VoLTE业务而导致的用户设备的语音业务接通率低的技术问题。
本申请提供的一种业务处理方法，该方法包括：
互联网协议多媒体子系统IMS核心网设备接收为用户设备UE在分组交换PS域建立长期演进网络语音传输VoLTE业务的请求消息；
所述IMS核心网设备确定无法在所述PS域建立所述VoLTE业务后，触发所述UE的电路域回落CSFB业务。
如此，IMS核心网设备接收为UE建立VoLTE业务的请求消息，并在确定无法建立所述VoLTE业务后，触发UE的CSFB业务，从而实现了在无法建立VoLTE业务的情况下，直接触发UE的CSFB业务，无需再尝试建立VoLTE业务，进而提高用户设备的接通成功率，保证UE请求的语音业务和补充业务，确保良好的用户体验。
可选地，所述IMS核心网设备确定存在以下至少一种情况后，确定无法在所述PS域建立所述VoLTE业务：
所述IMS核心网设备获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用；
所述IMS核心网设备确定所述UE当前所在的服务网络不支持VoLTE业务；
所述IMS核心网设备确定在所述PS域所述VoLTE业务的语音承载建立失败。
如此，在存在不可用的补充业务，或UE当前所在的服务网络不支持VoLTE业务，或VoLTE业务的语音承载建立失败的情况下，IMS核心网设备均确定为无法在所述PS域建立VoLTE业务，由于上述三种情形综合考虑了在PS域建立VoLTE业务过程中可能出现的无法建立VoLTE业务的情况，从而能够有效触发UE的CSFB业务，尽量避免尝试建立VoLTE业务。
可选地，所述IMS核心网设备获取伴随所述VoLTE业务的至少一项补充业务，包括：
所述IMS核心网设备根据所述UE的签约信息，获取伴随所述VoLTE业务的至少一项补充业务；或者，
所述IMS核心网设备在所述UE发送的补充业务建立请求消息中获取伴随所述VoLTE业务的至少一项补充业务。
如此，IMS核心网设备可通过上述两种方式获取到至少一项补充业务，从而便于后续判断是否存在不可用的补充业务。
可选地，所述IMS核心网设备确定所述UE当前所在的服务网络不支持 VoLTE业务，包括：所述IMS核心网设备确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE业务漫游协议。
如此，在确定UE当前所在的服务网络是否支持VoLTE业务时，可从上述两个方面来判断，即VPLMN是否开通VoLTE业务功能和VPLMN与HPLMN之间是否签署VoLTE业务漫游协议，从而综合考虑了各种不支持VoLTE业务的情形，使得判断结果更加准确，为后续是否触发UE的CSFB业务提供准确的基础。
可选地，所述IMS核心网设备确定存在以下至少一种情况后，确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能：
所述VPLMN不在已经开通VoLTE业务功能的网络白名单中；
所述VPLMN在未开通VoLTE业务功能的黑名单中；
所述VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE漫游协议；
所述VPLMN的代理-呼叫会话控制功能P-CSCF不在支持VoLTE业务功能的白名单中；
所述VPLMN的P-CSCF在不支持VoLTE业务功能的黑名单中。
如此，本申请中判断VPLMN是否开通VoLTE业务功能时，可依据实际情况从上述多个角度进行判断。
可选地，所述IMS核心网设备确定在所述PS域所述VoLTE业务的语音承载建立失败，包括：
所述IMS核心网设备接收重认证请求RAR消息或会话中止请求ASR消息；
所述IMS核心网设备确定所述RAR消息或ASR消息中携带用于指示承载资源不足的指示信息或用于指示资源分配失败的指示信息后，确定在所述PS域所述VoLTE业务的语音承载建立失败。
如此，IMS核心网设备可根据RAR消息或ASR消息中所携带的指示信 息来确定VoLTE业务的语音承载建立失败。
可选地，所述RAR消息或ASR消息中包括所述VoLTE业务的语音承载建立失败的原因值。
如此，RAR消息或ASR消息中携带有VoLTE业务的语音承载建立失败的原因值，从而便于IMS核心网设备记录语音承载建立失败的具体原因，为后续分析提供基础。
可选地，所述RAR消息或ASR消息中包括的所述VoLTE业务的语音承载建立失败的原因值为所述UE处于PS域的弱覆盖区域。
可选地，所述IMS核心网设备触发所述UE的CSFB业务之前，还包括：
所述IMS核心网设备确定所述UE已在电路交换域注册。
如此，本申请中，IMS核心网设备可以是在确定所述UE已经注册到电路交换域后，才触发UE的CSFB业务，而当所述IMS核心网设备在确定所述UE还未注册到电路交换域的情况下，即使所述IMS核心网设备确定无法建立所述VoLTE业务，所述IMS核心网设备也有可能不触发UE的CSFB业务。通过这种方式，能够在UE已在电路交换域注册后，才触发UE的CSFB业务，确保成功触发CSFB业务，若UE未在电路交换域注册，则可不再触发CSFB业务，进而避免多余的触发流程，节省处理资源。
可选地，所述IMS核心网设备确定所述UE已在电路交换域注册，包括：
所述IMS核心网设备从归属用户服务器HSS或归属位置寄存器HLR获取所述UE在电路交换CS网络注册的信息；
所述IMS核心网设备根据所述UE在所述CS网络注册的信息，确定所述UE已在电路交换域注册。
可选地，所述UE为VoLTE业务的主叫UE；
所述IMS核心网设备触发所述UE的CSFB业务，包括：
所述IMS核心网设备向所述主叫UE发送第一消息，所述第一消息用于触发所述主叫UE发起电路域回落CSFB主叫业务。
如此，IMS核心网设备通过向主叫UE发送第一消息来触发主叫UE发起 CSFB主叫业务，从而能够快速地触发CSFB业务。
可选地，所述第一消息中包括第一原因值，所述第一原因值用于告知所述主叫UE导致所述VoLTE业务不可用的具体原因。
如此，通过将第一原因值发送给主叫UE，能够便于主叫UE进行记录，进而为后续的统计分析等过程提供依据。
可选地，所述IMS核心网设备向所述主叫UE发送第一消息之前，还包括：
所述IMS核心网设备确定所述主叫UE对应的被叫UE处于振铃前状态。
如此，本申请中，IMS核心网设备可以是在确定主叫UE对应的被叫UE处于振铃前状态后，才触发UE的CSFB业务，而当所述IMS核心网设备确定主叫UE对应的被叫UE已经振铃的情况下，即使所述IMS核心网设备确定无法建立所述VoLTE业务，所述IMS核心网设备也有可能不触发UE的CSFB业务。通过这种方式，能够在主叫UE对应的被叫UE处于振铃前状态后，才触发UE的CSFB业务，确保用户的无感知，若主叫UE对应的被叫UE已经振铃，则可不再触发CSFB业务，进而避免多余的触发流程，节省处理资源。
可选地，所述IMS核心网设备为主叫方服务呼叫会话控制功能I/S-CSCF或主叫方业务集中和连续性应用服务器SCC AS或主叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述UE为VoLTE业务的被叫UE；
所述IMS核心网设备触发所述UE的CSFB业务，包括：
所述IMS核心网设备向被叫域选设备发送第二消息，所述第二消息用于指示在所述PS域的被叫业务建立失败，以使所述被叫域选设备触发所述被叫UE的电路域回落CSFB被叫业务。
如此，IMS核心网设备通过向被叫UE发送第二消息来触发被叫UE的CSFB业务，从而能够快速地触发CSFB业务。
可选地，所述第二消息中包括第二原因值，所述第二原因值用于告知所 述被叫域选设备在所述PS域的被叫建立失败的具体原因。
如此，通过将第二原因值发送给被叫域选设备，能够便于被叫域选设备进行记录，进而为后续的统计分析等过程提供依据。
可选地，所述IMS核心网设备向被叫域选设备发送第二消息之前，还包括：
所述IMS核心网设备确定所述被叫UE处于振铃前状态。
如此，本申请中，IMS核心网设备可以是在确定被叫UE处于振铃前状态后，才触发UE的CSFB业务，而当所述IMS核心网设备确定被叫UE已经振铃的情况下，即使所述IMS核心网设备确定无法建立所述VoLTE业务，所述IMS核心网设备也有可能不触发UE的CSFB业务。通过这种方式，能够在被叫UE处于振铃前状态后，才触发UE的CSFB业务，确保用户的无感知，若被叫UE已经振铃，则可不再触发CSFB业务，进而避免多余的触发流程，节省处理资源。
可选地，所述IMS核心网设备为被叫方服务呼叫会话控制功能I/S-CSCF或被叫方业务集中和连续性应用服务器SCC AS或被叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述IMS核心网设备向被叫域选设备发送第二消息，包括：
所述被叫方P-CSCF向所述被叫方I/S-CSCF发送所述第二消息，以使所述被叫方I/S-CSCF将所述第二消息转发给所述被叫域选设备。
本申请提供一种IMS核心网设备，所述IMS核心网设备包括：收发模块和处理模块；
所述收发模块，用于接收为用户设备UE在分组交换PS域建立长期演进网络语音传输VoLTE业务的请求消息；
所述处理模块，用于确定无法在所述PS域建立所述VoLTE业务后，触发所述UE的电路域回落CSFB业务。
可选地，所述处理模块具体用于，确定存在以下至少一种情况后，确定无法在所述PS域建立所述VoLTE业务：
获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用；
确定所述UE当前所在的服务网络不支持VoLTE业务；
确定在所述PS域所述VoLTE业务的语音承载建立失败。
可选地，所述处理模块通过以下方式获取伴随所述VoLTE业务的至少一项补充业务：
根据所述UE的签约信息，获取伴随所述VoLTE业务的至少一项补充业务；或者，
在所述UE发送的补充业务建立请求消息中获取伴随所述VoLTE业务的至少一项补充业务。
可选地，所述处理模块具体用于，通过如下方式确定所述UE当前所在的服务网络不支持VoLTE业务：确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE业务漫游协议。
可选地，所述处理模块具体用于，确定存在以下至少一种情况后，确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能：
所述VPLMN不在已经开通VoLTE业务功能的网络白名单中；
所述VPLMN在未开通VoLTE业务功能的黑名单中；
所述VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE漫游协议；
所述VPLMN的代理-呼叫会话控制功能P-CSCF不在支持VoLTE业务功能的白名单中；
所述VPLMN的P-CSCF在不支持VoLTE业务功能的黑名单中。
可选地，所述处理模块具体用于，通过如下方式确定在所述PS域所述VoLTE业务的语音承载建立失败：
通过所述收发模块接收重认证请求RAR消息或会话中止请求ASR消息；
确定所述RAR消息或ASR消息中携带用于指示承载资源不足的指示信 息或用于指示资源分配失败的指示信息后，确定在所述PS域所述VoLTE业务的语音承载建立失败。
可选地，所述RAR消息或ASR消息中包括所述VoLTE业务的语音承载建立失败的原因值。
可选地，所述RAR消息或ASR消息中包括的所述VoLTE业务的语音承载建立失败的原因值为所述UE处于PS域的弱覆盖区域。
可选地，所述处理模块触发所述UE的CSFB业务之前，还用于：
确定所述UE已在电路交换域注册。
可选地，所述处理模块具体用于，通过以下方式确定所述UE已在电路交换域注册：
从归属用户服务器HSS或归属位置寄存器HLR获取所述UE在电路交换CS网络注册的信息；
根据所述UE在所述CS网络注册的信息，确定所述UE已在电路交换域注册。
可选地，所述UE为VoLTE业务的主叫UE；
所述处理模块具体用于，通过以下方式触发所述UE的CSFB业务：
通过所述收发模块向所述主叫UE发送第一消息，所述第一消息用于触发所述主叫UE发起电路域回落CSFB主叫业务。
可选地，所述第一消息中包括第一原因值，所述第一原因值用于告知所述主叫UE导致所述VoLTE业务不可用的具体原因。
可选地，所述处理模块通过所述收发模块向所述主叫UE发送第一消息之前，还用于：
确定所述主叫UE对应的被叫UE处于振铃前状态。
可选地，所述IMS核心网设备为主叫方服务呼叫会话控制功能I/S-CSCF或主叫方业务集中和连续性应用服务器SCC AS或主叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述UE为VoLTE业务的被叫UE；
所述处理模块具体用于，通过以下方式触发所述UE的CSFB业务，包括：
通过所述收发模块向被叫域选设备发送第二消息，所述第二消息用于指示在所述PS域的被叫业务建立失败，以使所述被叫域选设备触发所述被叫UE的电路域回落CSFB被叫业务。
可选地，所述第二消息中包括第二原因值，所述第二原因值用于告知所述被叫域选设备在所述PS域的被叫建立失败的具体原因。
可选地，所述处理模块通过所述收发模块向被叫域选设备发送第二消息之前，还用于：
确定所述被叫UE处于振铃前状态。
可选地，所述IMS核心网设备为被叫方服务呼叫会话控制功能I/S-CSCF或被叫方业务集中和连续性应用服务器SCC AS或被叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述处理模块通过所述收发模块向被叫域选设备发送第二消息，具体为：
所述被叫方P-CSCF的处理模块通过所述收发模块向所述被叫方I/S-CSCF发送所述第二消息，以使所述被叫方I/S-CSCF将所述第二消息转发给所述被叫域选设备。
本申请提供另一种IMS核心网设备，所述IMS核心网设备包括：通信接口和处理器；
所述通信接口，用于接收为用户设备UE在分组交换PS域建立长期演进网络语音传输VoLTE业务的请求消息；
所述处理器，用于确定无法在所述PS域建立所述VoLTE业务后，触发所述UE的电路域回落CSFB业务。
可选地，所述处理器具体用于，确定存在以下至少一种情况后，确定无法在所述PS域建立所述VoLTE业务：
获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用；
确定所述UE当前所在的服务网络不支持VoLTE业务；
确定在所述PS域所述VoLTE业务的语音承载建立失败。
可选地，所述处理器通过以下方式获取伴随所述VoLTE业务的至少一项补充业务：
根据所述UE的签约信息，获取伴随所述VoLTE业务的至少一项补充业务；或者，
在所述UE发送的补充业务建立请求消息中获取伴随所述VoLTE业务的至少一项补充业务。
可选地，所述处理器具体用于，通过如下方式确定所述UE当前所在的服务网络不支持VoLTE业务：确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE业务漫游协议。
可选地，所述处理器具体用于，确定存在以下至少一种情况后，确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能：
所述VPLMN不在已经开通VoLTE业务功能的网络白名单中；
所述VPLMN在未开通VoLTE业务功能的黑名单中；
所述VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE漫游协议；
所述VPLMN的代理-呼叫会话控制功能P-CSCF不在支持VoLTE业务功能的白名单中；
所述VPLMN的P-CSCF在不支持VoLTE业务功能的黑名单中。
可选地，所述处理器具体用于，通过如下方式确定在所述PS域所述VoLTE业务的语音承载建立失败：
通过所述通信接口接收重认证请求RAR消息或会话中止请求ASR消息；
确定所述RAR消息或ASR消息中携带用于指示承载资源不足的指示信息或用于指示资源分配失败的指示信息后，确定在所述PS域所述VoLTE业务的语音承载建立失败。
可选地，所述RAR消息或ASR消息中包括所述VoLTE业务的语音承载建立失败的原因值。
可选地，所述RAR消息或ASR消息中包括的所述VoLTE业务的语音承载建立失败的原因值为所述UE处于PS域的弱覆盖区域。
可选地，所述处理器触发所述UE的CSFB业务之前，还用于：
确定所述UE已在电路交换域注册。
可选地，所述处理器具体用于，通过以下方式确定所述UE已在电路交换域注册：
从归属用户服务器HSS或归属位置寄存器HLR获取所述UE在电路交换CS网络注册的信息；
根据所述UE在所述CS网络注册的信息，确定所述UE已在电路交换域注册。
可选地，所述UE为VoLTE业务的主叫UE；
所述处理器具体用于，通过以下方式触发所述UE的CSFB业务：
通过所述通信接口向所述主叫UE发送第一消息，所述第一消息用于触发所述主叫UE发起电路域回落CSFB主叫业务。
可选地，所述第一消息中包括第一原因值，所述第一原因值用于告知所述主叫UE导致所述VoLTE业务不可用的具体原因。
可选地，所述处理器通过所述通信接口向所述主叫UE发送第一消息之前，还用于：
确定所述主叫UE对应的被叫UE处于振铃前状态。
可选地，所述IMS核心网设备为主叫方服务呼叫会话控制功能I/S-CSCF或主叫方业务集中和连续性应用服务器SCC AS或主叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述UE为VoLTE业务的被叫UE；
所述处理器具体用于，通过以下方式触发所述UE的CSFB业务，包括：
通过所述通信接口向被叫域选设备发送第二消息，所述第二消息用于指 示在所述PS域的被叫业务建立失败，以使所述被叫域选设备触发所述被叫UE的电路域回落CSFB被叫业务。
可选地，所述第二消息中包括第二原因值，所述第二原因值用于告知所述被叫域选设备在所述PS域的被叫建立失败的具体原因。
可选地，所述处理器通过所述通信接口向被叫域选设备发送第二消息之前，还用于：
确定所述被叫UE处于振铃前状态。
可选地，所述IMS核心网设备为被叫方服务呼叫会话控制功能I/S-CSCF或被叫方业务集中和连续性应用服务器SCC AS或被叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述处理器通过所述通信接口向被叫域选设备发送第二消息，具体为：
所述被叫方P-CSCF的处理器通过所述通信接口向所述被叫方I/S-CSCF发送所述第二消息，以使所述被叫方I/S-CSCF将所述第二消息转发给所述被叫域选设备。
本申请实施例中，IMS核心网设备接收为UE建立VoLTE业务的请求消息，IMS核心网设备确定无法建立所述VoLTE业务后，触发UE的CSFB业务，从而使得在无法建立VoLTE业务的情况下，直接触发UE的CSFB业务，而无需再尝试建立VoLTE业务，进而提高用户设备的接通成功率，保证UE请求的语音业务和补充业务，确保良好的用户体验，避免导致UE无法使用VoLTE业务接通且耗费处理时间的技术问题。
附图说明
为了更清楚地说明本申请实施例技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍。
图1是本申请实施例提供的一种通信网络的架构示意图；
图2是本申请实施例一提供的一种业务处理方法的流程示意图；
图3为本申请实施例二提供的业务处理方法的流程示意图；
图4为本申请实施例三提供的业务处理方法的流程示意图；
图5为本申请实施例四提供的业务处理方法的流程示意图；
图6为本申请实施例五提供的业务处理方法的流程示意图；
图7为本申请实施例六提供的业务处理方法的流程示意图；
图8为本申请实施例七提供的业务处理方法的流程示意图；
图9是本申请实施例提供的一种IMS核心网设备的结构示意图；
图10是本申请实施例提供的另一种IMS核心网设备的结构示意图。
具体实施方式
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”和“第四”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包括。例如包括了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
请参见图1，参见图1是本申请实施例提供的一种通信网络的架构示意图。其中，演进型基站(eNB，Evolved NodeB)与用户设备之间可通过无线链路通信连接。图1举例所示架构的LTE网络的核心网设备包括移动性管理实体(MME，Mobility Management Entity)、服务网关(SGW，Serving Gateway)、分组数据网络网关(PGW，PDN Gateway)、策略和计费规则功能实体等，核心网设备可以负责为UE的VoLTE业务接入互联网协议多媒体子系统(IP Multimedia Subsystem，IMS)网络起接续作用，负责传递UE与IMS网络之间的VoLTE呼叫相关信令，另外还可负责建立其相关的专用承载(例如业务质量等级标识(QCI，QoS Class Identifier)＝1)用于传递VoLTE业务的相关用户面数据(媒体数据)。
图1中还包括IMS核心网设备，具体为：代理呼叫会话控制功能(Proxy  Call Session Control Function，P-CSCF)实体、查询/服务呼叫会话控制功能(Interrogating/Serving Call Session Control Function，I/S-CSCF)实体、业务集中和连续性应用服务器(service centralization and continuity application server，SCC AS)。
P-CSCF(可以分主叫方P-CSCF和被叫方P-CSCF)为VoLTE业务过程中UE接入IMS网络的第一个接触点。其中，P-CSCF可以负责代理所有的VoLTE相关信令并完成路由控制。其中，在VoLTE呼叫过程中，P-CSCF还可以负责向策略和计费规则功能PCRF(Policy and Charging Rules Function)实体发送相关控制消息等。当UE处于漫游状态时，P-CSCF一般是指UE拜访公共陆上移动网(Visited Public Land Mobile Network，VPLMN)的P-CSCF。
其中，I/S-CSCF(可以分主叫方I/S-CSCF和被叫方I/S-CSCF)为IMS网络的业务交换中心，I/S-CSCF可主要负责接收并处理UE的注册请求、用户管理、会话控制、业务交换、业务控制、会话发起协议(Session Initiation Protocol，SIP)消息处理和计费等等。I/S-CSCF还可以根据应用的触发原则将例如SIP请求触发到相应的域选服务设备。
SCC AS，可以分为主叫方SCC AS和被叫方SCC AS，它是IMS网络中应用层服务器的总称，负责提供各种应用层业务。本申请实施例中，SCC AS中可包含被叫接入域选功能(T-ADS，Terminating Access Domain Selection)，因此SCC AS可以作为被叫域选设备，负责将被叫语音会话接续到相应的域(例如，CS域或PS域)。被叫域选设备可决定向UE发起VoLTE呼叫(对应接到PS域)还是传统的电路域呼叫(对应接到CS域)。可选地，SCC AS中也可以不包含被叫接入域选功能，此时可单独设置被叫域选设备，负责将被叫语音会话接续到相应的域(例如，CS域或PS域)。本申请实施例中可优选SCC AS中可包含被叫接入域选功能。
本申请实施例可以应用于LTE网络等网络中。
本申请实施例中，用户设备可以是无线终端也可以是有线终端，例如可以为移动电话、计算机、平板电脑、个人数码助理(英文：personal digital  assistant，缩写：PDA)、移动互联网设备(英文：mobile Internet device，缩写：MID)、可穿戴设备和电子书阅读器(英文：e-book reader)等。
本申请实施例的一些技术方案可以基于图1举例所示的通信网络架构或其变形架构来具体实施。
实施例一
本申请实施例一中，基于IMS核心网设备的角度予以描述。IMS核心网设备可以为服务呼叫会话控制功能I/S-CSCF或业务集中和连续性应用服务器SCC AS或代理-呼叫会话控制功能P-CSCF。
图2是本申请实施例一提供的一种业务处理方法的流程示意图。如图2所示，该方法包括：
步骤201，IMS核心网设备接收为UE建立VoLTE业务的请求消息；
步骤202，IMS核心网设备确定无法建立所述VoLTE业务后，触发所述UE的CSFB业务。
具体地，在步骤202中，IMS核心网设备确定无法建立所述VoLTE可以是指：IMS核心网设备获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用。其中，IMS核心网设备可以通过以下方式获取伴随所述VoLTE业务的至少一项补充业务：方式(1)，IMS核心网设备根据所述UE的签约信息，获取伴随所述VoLTE业务的至少一项补充业务；方式(2)，IMS核心网设备在所述UE发送的补充业务建立请求消息中获取伴随所述VoLTE业务的至少一项补充业务。
IMS核心网设备确定无法建立所述VoLTE也可以是指：IMS核心网设备确定所述UE当前所在的服务网络不支持VoLTE业务。具体来说，包括：IMS核心网设备确定所述UE所在的VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网(Home Public Land Mobile Network，HPLMN)之间未签署VoLTE业务漫游协议。其中，IMS核心网设备确定存在以下至少一种情况后，即可确定所述UE所在的VPLMN未开通VoLTE业务功能：
所述VPLMN不在已经开通VoLTE业务功能的网络白名单中；
所述VPLMN在未开通VoLTE业务功能的黑名单中；
所述VPLMN与HPLMN之间未签署VoLTE漫游协议；
所述VPLMN的P-CSCF不在支持VoLTE业务功能的白名单中；
所述VPLMN的P-CSCF在不支持VoLTE业务功能的黑名单中。
在步骤202中，IMS核心网设备触发所述UE的CSFB业务之前，需要确定所述UE已在电路交换域注册。具体来说，IMS核心网设备从归属用户服务器HSS或归属位置寄存器HLR获取所述UE在电路交换CS网络注册的信息，并根据所述UE在所述CS网络注册的信息，确定所述UE是否已在电路交换域注册。例如，IMS核心网设备可以向HSS/HLR询问UE是否已经在CS网络注册，归属签约用户服务器(Home Subscriber Server，HSS)/归属位置寄存器(Home Location Register，HLR)根据内部记录的对应所述UE的CS网络的位置信息确定所述UE已经在CS网络注册后，向IMS核心网设备应答所述UE已经在CS网络注册；或者，IMS核心网设备直接根据从HSS/HLR中获取的UE对应的CS网络的位置信息，确定所述UE已经在CS网络注册。其中，HSS/HLR中记录的UE对应的CS网络的位置信息具体可以是移动交换中心(Mobile Switching Center，MSC)号码/名称、拜访位置寄存器(Visitor Location Register，VLR)号码/名称、MSC区域(MSC area)等。
IMS核心网设备可以是在确定所述UE已经注册到电路交换域后，才触发UE的CSFB业务，而当所述IMS核心网设备在确定所述UE还未注册到电路交换域的情况下，即使所述IMS核心网设备确定无法建立所述VoLTE业务，所述IMS核心网设备也有可能不触发UE的CSFB业务。通过这种方式，能够在UE已在电路交换域注册后，才触发UE的CSFB业务，确保成功触发CSFB业务，若UE未在电路交换域注册，则可不再触发CSFB业务，进而避免多余的触发流程，节省处理资源。
本申请实施例中，所述UE可以为VoLTE业务的主叫UE，相应地，IMS核心网设备为主叫方I/S-CSCF或主叫方SCC AS或主叫方P-CSCF。所述UE 也可以为被叫UE，相应地，IMS核心网设备为被叫方I/S-CSCF或被叫方SCCAS或被叫方P-CSCF。
在步骤202中，若UE为VoLTE业务的主叫UE，则IMS核心网设备触发所述UE的CSFB业务，包括：IMS核心网设备向所述主叫UE发送第一消息，所述第一消息用于触发所述主叫UE发起电路域回落CSFB主叫业务。优选地，第一消息中包括第一原因值，第一原因值用于告知所述主叫UE导致所述VoLTE业务不可用的具体原因，例如，具体原因可以是哪种补充业务不可用导致VoLTE业务不可用，或者是UE所在网络未开通VoLTE功能导致的VoLTE业务不可用。通过将第一原因值发送给主叫UE，能够便于主叫UE进行记录，进而为后续的统计分析等过程提供依据。
在步骤202中，若UE为VoLTE业务的被叫UE，则IMS核心网设备触发所述UE的CSFB业务，包括：IMS核心网设备向被叫域选设备发送第二消息，第二消息用于指示所述被叫域选设备触发所述被叫UE的电路域回落CSFB被叫业务。可选地，第二消息中包括第二原因值，第二原因值用于告知被叫域选设备导致所述VoLTE业务不可用的具体原因，例如，具体原因可以是哪种补充业务不可用导致VoLTE业务不可用，或者是UE所在网络未开通VoLTE功能导致的VoLTE业务不可用。通过将第二原因值发送给被叫域选设备，能够便于被叫域选设备进行记录，进而为后续的统计分析等过程提供依据。
可以看出，本申请实施例中，以主叫情形为例，主叫方IMS核心网设备接收主叫UE发送的VoLTE业务请求消息后，若确定无法建立所述VoLTE业务，则通知主叫UE所述VoLTE业务不可用。根据现有技术流程，主叫UE在发起VoLTE业务请求后，若收到其对应的主叫IMS核心网设备发送的VoLTE业务不可用的响应消息，则会自动触发CSFB主叫流程，从而在CS域建立语音呼叫业务，从而能够有效避免签约了VoLTE业务的用户可能因漫游至未开通VoLTE功能的服务网络而导致的VoLTE呼叫失败问题，有利于提升用户VoLTE业务的稳定性；另一方面，用户在IMS网络不能被执行的补充业 务也可在CS网络被执行，这有利于提高用户的业务体验。例如，目前依然存在许多运营商其建设的IMS网络仅提供VoLTE语音业务，许多原传统CS网络可提供补充业务在IMS网络不能被支持；又如，某些运营商并未全面面向用户开通VoLTE功能，仅在少数子网络试点开通，并且这种状态可能持续很长一段时间。那么在这些场景下，UE可能就无法成功建立VoLTE业务从而影响通话业务的稳定性，或者即使能建立VoLTE业务但用户的业务体验并不理想。本申请实施例在上述场景下，UE可以回退至CS网络发起语音呼叫，进而有效提升通话业务的稳定性，并提升用户体验。
下面结合具体实施例对本申请实施例中的业务处理方法进行具体介绍。
实施例二
在本申请实施例二中，所述UE为VoLTE业务的主叫UE，相应地，IMS核心网设备为主叫方I/S-CSCF或主叫方SCC AS或主叫方P-CSCF。
图3为本申请实施例二提供的业务处理方法的流程示意图。如图3所示，该方法包括：
步骤301，主叫UE通过发送邀请(invite)消息来发起建立VoLTE业务。主叫方P-CSCF接收来自主叫UE的invite消息，并在接收到invite消息后，触发主叫方P-CSCF为主叫UE建立IMS主叫会话。
步骤302-303，主叫方P-CSCF将所述invite消息发往后续的IMS节点(例如I/S-CSCF和SCC AS等IMS节点)。
步骤304，主叫方SCC AS获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用后，确定无法建立所述VoLTE业务。
本申请实施例中，补充业务可能是网络侧根据UE的签约信息触发的。例如，主叫方SCC AS从HSS中获取主叫UE的签约数据，其中，主叫UE的签约数据中包含伴随VoLTE呼叫业务网络侧需要为主叫UE提供的补充业务(如彩铃，呼叫转移等)的相关信息。主叫方SCC AS根据补充业务的相关信息判断其中是否有某一或某些补充业务不能被IMS网络所支持。
可选地，补充业务也可能是UE侧主动发起的。例如，在主叫UE发起invite 消息请求建立VoLTE呼叫的流程中(具体可能是主叫UE已经发送invite请求VoLTE呼叫，但还未收到振铃响应)，主叫UE又根据用户指示，主动请求网络侧配合执行某些补充业务(LCS，位置业务)，此时，主叫UE再次发送invite消息(即为补充业务建立请求消息)，再次发送的invite消息用于请求IMS网络侧执行所述补充业务。主叫方SCC AS根据主叫UE再次发送的invite消息，判断其中请求的补充业务是否能够被IMS网络支持。例如，主叫方SCCAS确定主叫UE再次发送的invite消息中会话描述协议(Session Description Protocol，SDP)offer中描述的某一或某些补充业务对应的媒体要求并不能被满足，则可确定补充业务不被支持，无法建立所述VoLTE业务。需要说明的是，上述步骤304中确定能否建立所述VoLTE业务的操作也可以由主叫方I/S-CSCF执行，具体执行过程类似于AS的执行过程，此处不再赘述。
步骤305，主叫方SCC AS向主叫方I/S-CSCF回复380/503响应消息，主叫方I/S-CSCF将380/503响应消息下发至主叫方P-CSCF。
可选地，在步骤305之前，主叫方SCC AS还需要确定主叫UE已经在电路交换域注册，具体确定方法可参见实施一。也就是说，主叫方SCC AS只有在确定主叫UE已经在电路交换域注册的情况下，才执行步骤305以及后续操作，否则不执行。
步骤306，主叫方P-CSCF将380/503响应消息下发给主叫UE。
本申请实施例中，380/503响应消息用于指示当前的VoLTE业务不可用。380/503响应消息只是举例说明，也可以是其他名称的响应消息，具体可根据运营商策略和UE配置信息决定发送哪条响应消息。为了解决VoLTE漫游，IMS核心网设备可以根据主叫UE所在的不同的VPLMN来下发不同的响应消息，比如，针对A网络中的UE发送380消息，针对B网络的UE发送503消息。
可选地，在步骤306之前，被叫方P-CSCF还需要确定该主叫UE对应的被叫UE处于振铃前状态(Pre-alerting状态)，也就是说，被叫方P-CSCF只有在确定该主叫UE对应的被叫UE处于振铃前状态的情况下才执行步骤306 以及后续操作，否则不执行，从而可实现用户的无感知。
步骤307，主叫UE接收到主叫方P-CSCF发送的380/503消息后，可以重新主叫域选并发起CSFB呼叫。UE侧和网络侧配合执行CSFB流程，最终实现在CS域建立语音呼叫，若存在补充业务，则伴随语音业务的补充业务在CS域重新建立。
其中，伴随语音业务的补充业务在CS域重新建立，可能是CS域核心网设备根据签约数据获知伴随语音业务需要进行哪些补充业务，在CS语音呼叫建立过程中，所述CS域核心网设备同时触发补充业务的执行。或者，伴随语音业务的补充业务在CS域重新建立，也可能是主叫UE获知在LTE网络请求的补充业务失败经CSFB回落至CS域后，建立语音呼叫的同时，还可在CS域执行伴随VoLTE业务的补充业务。
需要说明的是，在步骤301后，也可由主叫方P-CSCF来确定能否建立所述VoLTE业务，确定的方法类似于步骤304，此处不再赘述。若主叫方P-CSCF确定无法建立所述VoLTE业务，则P-CSCF可直接执行步骤306，省略步骤302至步骤305。可选地，在步骤306之前，主叫方P-CSCF还需要确定主叫UE已经在电路交换域注册，具体确定方法可参见实施一。也就是说，主叫方P-CSCF只有在确定主叫UE已经在电路交换域注册的情况下才执行步骤306以及后续操作，否则不执行。
上述过程中，在主叫方UE伴随VoLTE语音业务而发起的其他补充业务的场景下，若IMS核心网设备判断出其中至少一项补充业务不能被支持，则IMS核心网设备拒绝主叫UE发起的VoLTE呼叫请求，从而使得VoLTE呼叫转变为CSFB呼叫。采用本申请实施例中的技术方案，有利于保证网络侧暂不支持UE发起的含某些特殊补充业务的VoLTE呼叫时，能够将所述VoLTE业务呼叫转化为CSFB呼叫，至少保证UE请求的语音业务，且UE对此不感知，保证了良好的用户体验。
实施例三
在本申请实施例三中，所述UE为VoLTE业务的被叫UE，相应地，IMS 核心网设备为被叫方I/S-CSCF或被叫方SCC AS或被叫方P-CSCF。
图4为本申请实施例三提供的业务处理方法的流程示意图。如图4所示，该方法包括：
步骤401，被叫方I/S-CSCF接收发往被叫UE的invite消息，并在接收到invite消息后，触发被叫方I/S-CSCF为被叫UE建立IMS被叫会话。
步骤402a，被叫方I/S-CSCF将所述invite消息发往被叫方SCC AS。
步骤402b，被叫方SCC AS执行其中的被叫域选功能，将被叫会话域选至PS域。
步骤402c，被叫方SCC AS向被叫方I/S-CSCF发送invite消息。
步骤403，被叫方I/S-CSCF将所述invite消息发往被叫方P-CSCF。
步骤404a-c、被叫方P-CSCF向被叫UE转发invite消息(步骤404a)，被叫UE回复183响应消息(步骤404c)，随后，183响应消息被P-CSCF转发至被叫方I/S-CSCF和被叫方SCC AS。该过程中，网络侧还会触发语音专有承载(QCI＝1)建立过程(步骤404b)。
步骤405，被叫方SCC AS获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用后，确定无法建立所述VoLTE业务。
本申请实施例中，补充业务可能是网络侧根据UE的签约信息触发的。例如，被叫方SCC AS从HSS中获取被叫UE的签约数据，其中，被叫UE的签约数据中包含伴随VoLTE呼叫业务网络侧需要为被叫UE提供的补充业务(如彩铃，呼叫转移等)的相关信息。被叫方SCC AS根据补充业务的相关信息判断其中是否有某一或某些补充业务不能被IMS网络所支持。
可选地，补充业务也可能是UE侧主动发起的。例如，在被叫UE接收invite消息请求建立VoLTE呼叫的流程中，此时，被叫UE主动发送invite消息(即为补充业务建立请求消息)，发送的invite消息用于请求IMS网络侧执行所述补充业务。被叫方SCC AS根据被叫UE发送的invite消息，判断其中请求的补充业务是否能够被IMS网络支持。例如，被叫方SCC AS确定被叫UE发送的invite消息中SDP offer描述的某一或某些补充业务对应的媒体要求并不 能被满足，则可确定补充业务不被支持，无法建立所述VoLTE业务。
需要说明的是，上述步骤405中确定能否建立所述VoLTE业务的操作也可以由被叫方I/S-CSCF在步骤401中接收到invite消息之后执行，具体执行过程类似于AS的执行过程，此处不再赘述。
步骤406、被叫方SCC AS向被叫域选设备回复380/503响应消息。可选地，被叫方SCC AS向被叫域选设备发送的响应消息也可以是其他响应消息，380和503响应消息只是举例说明，具体发送的响应消息可根据运营商配置信息等设置。
需要说明的是，若是由被叫方I/S-CSCF执行步骤405的判断操作，那么在判断出无法建立所述VoLTE业务后，由被叫方I/S-CSCF发送380/503消息响应消息至被叫域选设备。
可选地，在步骤406之前，被叫方SCC AS还需要确定被叫UE已经在电路交换域注册，具体的确定方法见实施例一。也就是说，被叫方SCC AS只有在确定被叫UE已经在电路交换域注册的情况下才执行步骤406以及后续操作，否则不执行。
可选地，在步骤406之前，被叫方P-CSCF还需要确定被叫UE处于振铃前状态(Pre-alerting状态)，也就是说，被叫方P-CSCF只有在确定被叫UE处于振铃前状态的情况下才执行步骤406以及后续操作，否则不执行，从而可实现用户的无感知。步骤407，若步骤S404被执行，则在判断出无法建立所述VoLTE业务后，被叫方SCC AS向被叫UE发送取消(cancel)消息，用以取消已经请求的VoLTE业务相关会话。其中，S406与S407的执行不限定先后的关系。
需要说明的是，若是由被叫方I/S-CSCF执行步骤405的操作，则S407也应由被叫方I/S-CSCF执行。
步骤408a-408b，被叫域选设备将被叫会话重新域选至CS域，并经被叫方I/S-CSCF等设备向CS域呼叫控制设备(如MSC)发起呼叫。
步骤409，CS域呼叫控制设备(如MSC)经SGs接口向MME发起呼叫。
步骤410，MME触发被叫UE的CSFB流程，具体流程细节见3GPP TS 23.272中的相关描述。此处不再赘述。经过被叫UE的CSFB流程，被叫UE最终实现在CS域建立语音会话，若存在补充业务，则伴随语音业务的补充业务在CS域重新建立。
需要说明的是，在步骤403后，也可由被叫方P-CSCF执行步骤405的操作，操作方式类似于步骤405，此处不再赘述。若确定无法建立VoLTE业务，则被叫方P-CSCF直接执行步骤406，省略步骤404以及步骤407。可选地，在步骤406之前，被叫方P-CSCF还需要确定被叫UE已经在电路交换域注册，具体的确定方法见实施例一。也就是说，被叫方P-CSCF只有在确定UE已经在电路交换域注册的情况下才执行步骤406以及后续操作，否则不执行。
上述过程中，在被叫方UE伴随VoLTE语音业务而发起的其他补充业务的场景下，若IMS核心网设备判断出其中至少一项补充业务不能被支持，则IMS核心网设备将呼叫重新域选至CS域，从而触发对被叫UE的CSFB呼叫流程。采用本申请实施例中的技术方案，有利于保证网络侧暂不支持UE的含某些特殊补充业务的VoLTE业务时，能够将所述VoLTE业务转化为CSFB业务，至少保证UE请求的语音业务，且UE对此不感知，保证了良好的用户体验。
实施例四
在本申请实施例四中，所述UE为VoLTE业务的主叫UE，相应地，IMS核心网设备为主叫方S-CSCF或主叫方SCC AS或主叫方P-CSCF。
图5为本申请实施例四提供的业务处理方法的流程示意图。如图5所示，该方法包括：
步骤501，主叫UE通过发送邀请(invite)消息来发起建立VoLTE业务。主叫方P-CSCF接收来自主叫UE的invite消息，并在接收到invite消息后，触发主叫方P-CSCF为主叫UE建立IMS主叫会话。
步骤502-503，主叫方P-CSCF将所述invite消息发往后续的IMS节点(例如S-CSCF和SCC AS等IMS节点)。
步骤504，主叫方SCC AS确定所述UE当前所在的服务网络不支持VoLTE业务后，确定无法建立所述VoLTE业务。
本申请实施例中，主叫方SCC AS确定所述UE当前所在的服务网络不支持VoLTE业务是指UE所在的VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE业务漫游协议。
具体地，主叫方SCC AS可以从接收到的Invite消息中获取主叫方P-CSCF的地址，根据主叫方P-CSCF的地址获知主叫方P-CSCF所属的VPLMN，若判断VPLMN不在已经开通VoLTE功能的网络白名单中，或者VPLMN在未开通VoLTE功能的黑名单中，或者VPLMN与HPLMN之间未签署VoLTE漫游协议等后，则确定UE当前所在的服务网络不支持VoLTE业务。
主叫方SCC AS也可以从接收到的Invite消息中获取主叫方P-CSCF的地址，直接根据主叫方P-CSCF的地址进行判断，若判断主叫方P-CSCF不在支持VoLTE业务的白名单中，或者主叫方P-CSCF在不支持VoLTE业务的黑名单中后，则确定主叫方P-CSCF所在的网络(即VPLMN)对HPLMN的VoLTE业务不支持。
需要说明的是，上述步骤504中确定能否建立所述VoLTE业务的操作也可以由主叫方S-CSCF执行，具体执行过程类似于AS的执行过程，此处不再赘述。
步骤505，主叫方SCC AS向主叫方S-CSCF回复380/503响应消息，主叫方S-CSCF将380/503响应消息下发至主叫方P-CSCF。
可选地，在步骤505之前，主叫方SCC AS还需要确定主叫UE已经在电路交换域注册，具体确定方法可参见实施一。也就是说，主叫方SCC AS只有在确定主叫UE已经在电路交换域注册的情况下，才执行步骤505以及后续操作，否则不执行。
步骤506，主叫方P-CSCF将380/503响应消息下发给主叫UE。
本申请实施例中，380/503响应消息用于指示当前的VoLTE业务不可用。 380/503响应消息只是举例说明，也可以是其他名称的响应消息，具体可根据运营商策略和UE配置信息决定发送哪条响应消息。为了解决VoLTE漫游，IMS核心网设备可以根据主叫UE所在的不同的VPLMN来下发不同的响应消息，比如，针对A网络中的UE发送380消息，针对B网络的UE发送503消息。
可选地，在步骤506之前，被叫方P-CSCF还需要确定该主叫UE对应的被叫UE处于振铃前状态(Pre-alerting状态)，也就是说，被叫方P-CSCF只有在确定该主叫UE对应的被叫UE处于振铃前状态的情况下才执行步骤506以及后续操作，否则不执行，从而可实现用户的无感知。
步骤507，主叫UE接收到主叫方P-CSCF发送的380/503消息后，可以重新主叫域选并发起CSFB呼叫。UE侧和网络侧配合执行CSFB流程，最终实现在CS域建立语音呼叫。
需要说明的是，在步骤501后，也可由主叫方P-CSCF来确定能否建立所述VoLTE业务，具体来说，在步骤504中，主叫方P-CSCF需要确定自身是否支持VOLTE业务，或者自身所在的VPLMN是否支持VOLTE业务。若主叫方P-CSCF确定无法建立所述VoLTE业务，则P-CSCF可直接执行步骤506，省略步骤502至步骤505。可选地，在步骤506之前，主叫方P-CSCF还需要确定主叫UE已经在电路交换域注册，具体确定方法可参见实施一。也就是说，主叫方P-CSCF只有在确定主叫UE已经在电路交换域注册的情况下才执行步骤506以及后续操作，否则不执行。
上述过程中，IMS核心网设备判断主叫方UE在VPLMN发起VoLTE呼叫且VPLMN不支持此VoLTE呼叫流程，例如，IMS核心网设备确定VPLMN暂未开通VoLTE功能，或者VPLMN与IMS所在的HPLMN之间未签署漫游协议后，则IMS核心网拒绝主叫UE发起的VoLTE呼叫请求，从而导致VoLTE呼叫转变为CSFB呼叫。采用本申请实施例中的技术方案，有利于保证主叫UE在暂未开通VoLTE功能的VPLMN发起VoLTE呼叫等场景下，能够在主叫语音会话建立阶段就使用CSFB呼叫来代替VoLTE业务呼叫，保证UE发 起的呼叫的成功率，且UE对此不感知，保证了良好的用户体验。
实施例五
在本申请实施例五中，所述UE为VoLTE业务的被叫UE，相应地，IMS核心网设备为被叫方I/S-CSCF或被叫方SCC AS或被叫方P-CSCF。
图6为本申请实施例五提供的业务处理方法的流程示意图。如图6所示，该方法包括：
步骤601，被叫方I/S-CSCF接收发往被叫UE的invite消息，并在接收到invite消息后，触发被叫方I/S-CSCF为被叫UE建立IMS被叫会话。
步骤602a，被叫方I/S-CSCF将所述invite消息发往被叫方SCC AS。
步骤602b，被叫方SCC AS执行其中的被叫域选功能，将被叫会话域选至PS域。
步骤602c，被叫方SCC AS向被叫方I/S-CSCF发送invite消息。
步骤603，被叫方I/S-CSCF将所述invite消息发往被叫方P-CSCF。
步骤604a-c、被叫方P-CSCF向被叫UE转发invite消息(步骤604a)，被叫UE回复183响应消息(步骤604c)，随后，183响应消息被P-CSCF转发至被叫方I/S-CSCF和被叫方SCC AS。该过程中，网络侧还会触发语音专有承载(QCI＝1)建立过程(步骤604b)。
步骤605，被叫方SCC AS确定所述UE当前所在的服务网络不支持VoLTE业务后，确定无法建立所述VoLTE业务。
被叫方SCC AS确定所述UE当前所在的服务网络不支持VoLTE业务是指UE所在的VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与HPLMN之间未签署VoLTE业务漫游协议。
具体地，被叫方SCC AS可以在被叫UE的IMS注册流程中获取被叫方P-CSCF的地址，或者，从被叫UE发送的183响应消息中获取被叫方P-CSCF的地址，并根据被叫方P-CSCF的地址获知被叫方P-CSCF所属的VPLMN，若判断VPLMN不在已经开通VoLTE功能的网络白名单中，或者VPLMN在未开通VoLTE功能的黑名单中，或者VPLMN与HPLMN之间未签署VoLTE 漫游协议，或者被叫方P-CSCF不在支持VoLTE业务的白名单中，或者被叫方P-CSCF在不支持VoLTE业务的黑名单中，则确定UE当前所在的服务网络不支持VoLTE业务。若被叫方SCC AS是在被叫UE的IMS注册流程中获取被叫方P-CSCF的地址，则被叫方SCC AS在步骤602接收到invite消息后，即可用此方案判断被叫UE所在的VPLMN对HPLMN的VoLTE业务不支持，也即在步骤602后直接利用本方案执行步骤605的操作，步骤603和步骤604可以被省略。
被叫方SCC AS也可以向HSS/HLR获取被叫UE当前注册的VPLMN，具体地，VPLMN可能被包含在MME标识或APN等信元中。若判断VPLMN不在已经开通VoLTE功能的网络白名单中，或者VPLMN在未开通VoLTE功能的黑名单中，或者VPLMN与HPLMN之间未签署VoLTE漫游协议，则确定被叫方P-CSCF所在的网络(即VPLMN)对HPLMN的VoLTE业务不支持。同样地，此时在步骤602后，被叫方SCC AS直接利用此方案执行S605的操作，步骤603和步骤604可以被省略。
需要说明的是，上述步骤605中确定能否建立所述VoLTE业务的操作也可以由被叫方I/S-CSCF在步骤601中接收到invite消息之后执行，具体执行过程类似于AS的执行过程，此处不再赘述。
步骤606、被叫方SCC AS向被叫域选设备回复380/503响应消息。可选地，被叫方SCC AS向被叫域选设备发送的响应消息也可以是其他响应消息，380和503响应消息只是举例说明，具体发送的响应消息可根据运营商配置信息等设置。
需要说明的是，若是由被叫方I/S-CSCF执行步骤605的判断操作，那么在判断出无法建立所述VoLTE业务后，由被叫方I/S-CSCF发送380/503消息响应消息至被叫域选设备。
可选地，在步骤606之前，被叫方SCC AS还需要确定被叫UE已经在电路交换域注册，具体的确定方法见实施例一。也就是说，被叫方SCC AS只有在确定UE已经在电路交换域注册的情况下才执行步骤606以及后续操作，否 则不执行。
可选地，在步骤606之前，被叫方P-CSCF还需要确定被叫UE处于振铃前状态(Pre-alerting状态)，也就是说，被叫方P-CSCF只有在确定被叫UE处于振铃前状态的情况下才执行步骤606以及后续操作，否则不执行，从而可实现用户的无感知。
步骤607，若步骤S604被执行，则在判断出无法建立所述VoLTE业务后，被叫方SCC AS向被叫UE发送取消(cancel)消息，用以取消已经请求的VoLTE业务相关会话。其中，S606与S607的执行不限定先后的关系。
需要说明的是，若是由被叫方I/S-CSCF执行步骤605的操作，则S607也应由被叫方I/S-CSCF执行。
步骤608a-608b，被叫域选设备将被叫会话重新域选至CS域，并经被叫方I/S-CSCF等设备向CS域呼叫控制设备(如MSC)发起呼叫。
步骤609，CS域呼叫控制设备(如MSC)经SGs接口向MME发起呼叫。
步骤610，MME触发被叫UE的CSFB流程，具体流程细节见3GPP TS23.272中的相关描述。此处不再赘述。经过被叫UE的CSFB流程，被叫UE最终实现在CS域建立语音会话。
需要说明的是，在步骤603后，也可由被叫方P-CSCF执行步骤605的操作，具体来说，在步骤605中，被叫方P-CSCF需要确定自身是否支持VOLTE业务，或者自身所在的VPLMN是否支持VOLTE业务。若确定无法建立VoLTE业务，则被叫方P-CSCF直接执行步骤606，省略步骤604以及步骤607。
可选地，在步骤606之前，被叫方P-CSCF还需要确定被叫UE已经在电路交换域注册，具体的确定方法见实施例一。也就是说，被叫方P-CSCF只有在确定UE已经在电路交换域注册的情况下才执行步骤606以及后续操作，否则不执行。
上述过程中，IMS核心网设备判断VoLTE业务被叫方UE所在的VPLMN不支持VoLTE呼叫流程，例如，确定VPLMN暂未开通VoLTE功能，或者VPLMN与IMS所在的HPLMN之间未签署漫游协议后，IMS核心网设备将 呼叫重新域选至CS域，从而触发对被叫UE的CSFB呼叫流程。采用本申请实施例中的技术方案，有利于保证签约了VoLTE业务的UE在暂未开通VoLTE功能的VPLMN被呼叫的场景下，能够在被叫语音会话建立阶段就使用CSFB被叫来代替VoLTE业务被叫，保证UE被叫成功率，且UE对此不感知，保证了良好的用户体验。
实施例六
在本申请实施例六中，所述UE为VoLTE业务的主叫UE，相应地，IMS核心网设备为主叫方S-CSCF或主叫方SCC AS或主叫方P-CSCF。
图7为本申请实施例六提供的业务处理方法的流程示意图。如图7所示，该方法包括：
步骤701，主叫UE通过发送邀请(invite)消息来发起建立VoLTE业务。主叫方P-CSCF接收来自主叫UE的invite消息，并在接收到invite消息后，触发主叫方P-CSCF为主叫UE建立IMS主叫会话。
步骤702-703，主叫方P-CSCF将所述invite消息发往后续的IMS节点(例如S-CSCF和SCC AS等IMS节点)。
步骤704a-704b，主叫方P-CSCF确定语音专有承载(QCI＝1)建立流程失败。
举例说明，在步骤704a-704b中，主叫方P-CSCF通过向EPC网络设备(如PCRF)发送鉴权授权请求(AAR，Authentication Authorization Request)以触发所述语音专有承载的建立。所述AAR中可携带主叫UE的用户标识、IMS应用层计费标识和媒体描述信息等。媒体描述信息可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。
在主叫方P-CSCF发送所述AAR消息之后，若主叫方P-CSCF接收到EPC网络设备(如PCRF)发送的重认证请求(RAR，Re-authentication Request)消息/会话中止请求(ASR，Abort-Session-Request)消息，所述RAR消息/ASR消息可携带用于指示承载资源不足的指示信息或用于指示资源分配失败的指示信息，则主叫方P-CSCF可确定所述语音专有承载(QCI＝1)建立流程失败。
可选地，所述主叫方P-CSCF还可从所述RAR消息/ASR消息中获取所述语音专有承载(QCI＝1)建立失败的具体原因值，例如，原因值可以为主叫UE处于PS域的弱覆盖区域。
需要说明的是，步骤704a-704b也可以在步骤702或步骤703之前执行，上述步骤编号仅是一种执行顺序的示例性表示，本申请实施例中对具体执行顺序不做具体限定。
步骤705，主叫方P-CSCF将380/503响应消息下发给主叫UE。
可选地，在步骤705之前，主叫方P-CSCF还需要确定主叫UE已经在电路交换域注册，具体确定方法可参见实施一。也就是说，主叫方P-CSCF只有在确定主叫UE已经在电路交换域注册的情况下，才执行步骤705以及后续操作，否则不执行。
本申请实施例中，380/503响应消息用于指示当前的VoLTE业务不可用。380/503响应消息只是举例说明，也可以是其他名称的响应消息，具体可根据运营商策略和UE配置信息决定发送哪条响应消息。
可选地，在步骤705之前，主叫方P-CSCF还需要确定主叫UE对应的被叫UE处于振铃前状态(Pre-alerting状态)，也就是说，主叫方P-CSCF只有在确定被叫UE处于振铃前状态的情况下才执行步骤705以及后续操作，否则不执行，从而可实现用户的无感知。
步骤706，主叫UE接收到主叫方P-CSCF发送的380/503消息后，可以重新主叫域选并发起CSFB呼叫。UE侧和网络侧配合执行CSFB流程，最终实现在CS域建立语音呼叫。
上述过程中，IMS核心网设备判断在PS域无法建立主叫VoLTE业务对应的语音专有承载后，则IMS核心网拒绝主叫UE发起的VoLTE呼叫请求，从而导致VoLTE呼叫转变为CSFB呼叫。采用本申请实施例中的技术方案，有利于保证在无法建立主叫VoLTE业务对应的语音专有承载等场景下，能够在主叫语音会话建立阶段就使用CSFB呼叫来代替VoLTE业务呼叫，保证UE发起的呼叫的成功率，且UE对此不感知，保证了良好的用户体验。
实施例七
在本申请实施例七中，所述UE为VoLTE业务的被叫UE，相应地，IMS核心网设备为被叫方P-CSCF。
图8为本申请实施例六提供的业务处理方法的流程示意图。如图7所示，该方法包括：
步骤801，被叫方I/S-CSCF接收发往被叫UE的invite消息，并在接收到invite消息后，触发被叫方I/S-CSCF为被叫UE建立IMS被叫会话。
步骤802，被叫方I/S-CSCF将所述invite消息发往被叫方SCC AS。
步骤802a，被叫方SCC AS执行其中的被叫域选功能，将被叫会话域选至PS域。
步骤802b，被叫方SCC AS向被叫方I/S-CSCF发送invite消息。
步骤803，被叫方I/S-CSCF将所述invite消息发往被叫方P-CSCF。
步骤804a-c、被叫方P-CSCF向被叫UE转发invite消息(步骤804a)，被叫UE回复183响应消息(步骤804b)，随后，183响应消息被P-CSCF转发至被叫方I/S-CSCF和被叫方SCC AS。该过程中，网络侧还会触发语音专有承载(QCI＝1)建立过程(步骤804c)。
步骤805，被叫方P-CSCF确定所述语音专有承载(QCI＝1)建立流程失败。
举例说明，在步骤804c中，被叫方P-CSCF通过向EPC网络设备(如PCRF)发送鉴权授权请求(AAR，Authentication Authorization Request)以触发所述语音专有承载的建立。所述AAR中可携带被叫UE的用户标识、IMS应用层计费标识和媒体描述信息等。媒体描述信息可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。
在被叫方P-CSCF发送所述AAR消息之后，若被叫方P-CSCF接收到EPC网络设备(如PCRF)发送的重认证请求(RAR，Re-authentication Request)消息/会话中止请求(ASR，Abort-Session-Request)消息，所述RAR消息/ASR消息可携带用于指示承载资源不足的指示信息或用于指示资源分配失败的指 示信息，则被叫方P-CSCF可确定所述语音专有承载(QCI＝1)建立流程失败。
可选地，所述被叫方P-CSCF还可从所述RAR消息/ASR消息中获取所述语音专有承载(QCI＝1)建立失败的具体原因值，例如，原因值可以为被叫UE处于PS域的弱覆盖区域。
步骤806，被叫方P-CSCF向被叫方SCC AS回复380/503响应消息，所述380/503消息中包含用于指示在PS域的被叫业务建立失败的指示信息。
可选地，被叫方P-CSCF向被叫方SCC AS发送的响应消息也可以是其他响应消息，380和503响应消息只是举例说明，具体发送的响应消息可根据运营商配置信息等设置。
需要说明的是，被叫方P-CSCF可以经被叫方S-CSCF向被叫方SCC AS回复380/503响应消息。
可选地，在步骤806之前，被叫方P-CSCF还需要确定被叫UE已经在电路交换域注册，具体的确定方法见实施例一。也就是说，被叫方P-CSCF只有在确定UE已经在电路交换域注册的情况下才执行步骤806以及后续操作，否则不执行。
可选地，在步骤806之前，被叫方P-CSCF还需要确定被叫UE处于振铃前状态(Pre-alerting状态)，也就是说，被叫方P-CSCF只有在确定被叫UE处于振铃前状态的情况下才执行步骤806以及后续操作，否则不执行，从而可实现用户的无感知。步骤807a-807b，被叫方SCC AS执行其中的被叫域选功能，将被叫会话重新域选至CS域，并经被叫方I/S-CSCF等设备向CS域呼叫控制设备(如MSC)发起呼叫。
步骤808，CS域呼叫控制设备(如MSC)经SGs接口向MME发起呼叫。
步骤809，MME触发被叫UE的CSFB流程，具体流程细节见3GPP TS 23.272中的相关描述。此处不再赘述。经过被叫UE的CSFB流程，被叫UE最终实现在CS域建立语音会话。
上述过程中，被叫IMS核心网设备判断在PS域无法建立被叫VoLTE业务对应的语音专有承载，则被叫IMS核心网设备将被叫重新域选至CS域， 从而触发对被叫UE的CSFB呼叫流程。采用本申请实施例中的技术方案，有利于保证对被叫UE无法进行被叫VoLTE业务时，能够在被叫语音会话建立阶段就使用CSFB被叫来代替VoLTE业务被叫，保证UE被叫成功率，且UE对此不感知，保证了良好的用户体验。
针对上述方法流程，本申请实施例还提供一种IMS核心网设备，该设备的具体内容可以参照上述方法实施。
基于相同构思，图9为本申请实施例提供的一种IMS核心网设备的结构示意图，用于执行以上方法流程，所述IMS核心网设备900包括：
所述收发模块901，用于接收为用户设备UE在分组交换PS域建立长期演进网络语音传输VoLTE业务的请求消息；
所述处理模块902，用于确定无法在所述PS域建立所述VoLTE业务后，触发所述UE的电路域回落CSFB业务。
可选地，所述处理模块902具体用于，确定存在以下至少一种情况后，确定无法在所述PS域建立所述VoLTE业务：
获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用；
确定所述UE当前所在的服务网络不支持VoLTE业务；
确定在所述PS域所述VoLTE业务的语音承载建立失败。
可选地，所述处理模块902通过以下方式获取伴随所述VoLTE业务的至少一项补充业务：
根据所述UE的签约信息，获取伴随所述VoLTE业务的至少一项补充业务；或者，
在所述UE发送的补充业务建立请求消息中获取伴随所述VoLTE业务的至少一项补充业务。
可选地，所述处理模块902具体用于，通过如下方式确定所述UE当前所在的服务网络不支持VoLTE业务：确定所述UE所在的拜访公共陆上移动网 VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE业务漫游协议。
可选地，所述处理模块902具体用于，确定存在以下至少一种情况后，确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能：
所述VPLMN不在已经开通VoLTE业务功能的网络白名单中；
所述VPLMN在未开通VoLTE业务功能的黑名单中；
所述VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE漫游协议；
所述VPLMN的代理-呼叫会话控制功能P-CSCF不在支持VoLTE业务功能的白名单中；
所述VPLMN的P-CSCF在不支持VoLTE业务功能的黑名单中。
可选地，所述处理模块902具体用于，通过如下方式确定在所述PS域所述VoLTE业务的语音承载建立失败：
通过所述收发模块接收重认证请求RAR消息或会话中止请求ASR消息；
确定所述RAR消息或ASR消息中携带用于指示承载资源不足的指示信息或用于指示资源分配失败的指示信息后，确定在所述PS域所述VoLTE业务的语音承载建立失败。
可选地，所述RAR消息或ASR消息中包括所述VoLTE业务的语音承载建立失败的原因值。
可选地，所述RAR消息或ASR消息中包括的所述VoLTE业务的语音承载建立失败的原因值为所述UE处于PS域的弱覆盖区域。
可选地，所述处理模块902触发所述UE的CSFB业务之前，还用于：
确定所述UE已在电路交换域注册。
可选地，所述处理模块具体用于，通过以下方式确定所述UE已在电路交换域注册：
从归属用户服务器HSS或归属位置寄存器HLR获取所述UE在电路交换CS网络注册的信息；
根据所述UE在所述CS网络注册的信息，确定所述UE已在电路交换域注册。
可选地，所述UE为VoLTE业务的主叫UE；
所述处理模块902具体用于，通过以下方式触发所述UE的CSFB业务：
通过所述收发模块901向所述主叫UE发送第一消息，所述第一消息用于触发所述主叫UE发起电路域回落CSFB主叫业务。
可选地，所述第一消息中包括第一原因值，所述第一原因值用于告知所述主叫UE导致所述VoLTE业务不可用的具体原因。
可选地，所述处理模块902通过所述收发模块901向所述主叫UE发送第一消息之前，还用于：
确定所述主叫UE对应的被叫UE处于振铃前状态。
可选地，所述IMS核心网设备为主叫方服务呼叫会话控制功能I/S-CSCF或主叫方业务集中和连续性应用服务器SCC AS或主叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述UE为VoLTE业务的被叫UE；
所述处理模块902具体用于，通过以下方式触发所述UE的CSFB业务，包括：
通过所述收发模块901向被叫域选设备发送第二消息，所述第二消息用于指示在所述PS域的被叫业务建立失败，以使所述被叫域选设备触发所述被叫UE的电路域回落CSFB被叫业务。
可选地，所述第二消息中包括第二原因值，所述第二原因值用于告知所述被叫域选设备在所述PS域的被叫建立失败的具体原因。
可选地，所述处理模块902通过所述收发模块901向被叫域选设备发送第二消息之前，还用于：
确定所述被叫UE处于振铃前状态。
可选地，所述IMS核心网设备为被叫方服务呼叫会话控制功能I/S-CSCF或被叫方业务集中和连续性应用服务器SCC AS或被叫方代理-呼叫会话控制 功能P-CSCF。
可选地，所述处理模块902通过所述收发模块901向被叫域选设备发送第二消息，具体为：
所述被叫方P-CSCF的处理模块902通过所述收发模块901向所述被叫方I/S-CSCF发送所述第二消息，以使所述被叫方I/S-CSCF将所述第二消息转发给所述被叫域选设备。
本申请实施例中，IMS核心网设备接收为UE建立VoLTE业务的请求消息，IMS核心网设备确定无法建立所述VoLTE业务后，触发UE的CSFB业务，从而使得在无法建立VoLTE业务的情况下，直接触发UE的CSFB业务，而无需再尝试建立VoLTE业务，进而提高用户设备的接通成功率，保证UE请求的语音业务和补充业务，确保良好的用户体验，避免导致UE无法使用VoLTE业务接通且耗费处理时间的技术问题。
基于相同构思，图10为本申请实施例提供的另一种IMS核心网设备的结构示意图，用于执行以上方法流程，所述IMS核心网设备1000包括：通信接口1001、处理器1002、存储器1003、总线系统1004；
其中，存储器1003，用于存放程序。具体地，程序可以包括程序代码，程序代码包括计算机操作指令。存储器1003可能为随机存取存储器(random access memory，简称RAM)，也可能为非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。图中仅示出了一个存储器，当然，存储器也可以根据需要，设置为多个。存储器1003也可以是处理器1002中的存储器。
存储器1003存储了如下的元素，可执行模块或者数据结构，或者它们的子集，或者它们的扩展集：
操作指令：包括各种操作指令，用于实现各种操作。
操作系统：包括各种系统程序，用于实现各种基础业务以及处理基于硬件的任务。
处理器1002控制IMS核心网设备1000的操作，处理器1002还可以称为 CPU(Central Processing Unit，中央处理单元)。具体的应用中，IMS核心网设备1000的各个组件通过总线系统1004耦合在一起，其中总线系统1004除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图中将各种总线都标为总线系统1004。为便于表示，图10中仅示意性表示。
上述本申请实施例揭示的方法可以应用于处理器1002中，或者由处理器1002实现。处理器1002可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器1002中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器1002可以是通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1003，处理器1002读取存储器1003中的信息，结合其硬件执行以下步骤：
通过所述通信接口1001接收为用户设备UE在分组交换PS域建立长期演进网络语音传输VoLTE业务的请求消息；
确定无法在所述PS域建立所述VoLTE业务后，触发所述UE的电路域回落CSFB业务。
可选地，所述处理器1002具体用于，确定存在以下至少一种情况后，确定无法在所述PS域建立所述VoLTE业务：
获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用；
确定所述UE当前所在的服务网络不支持VoLTE业务；
确定在所述PS域所述VoLTE业务的语音承载建立失败。
可选地，所述处理器1002通过以下方式获取伴随所述VoLTE业务的至少一项补充业务：
根据所述UE的签约信息，获取伴随所述VoLTE业务的至少一项补充业务；或者，
在所述UE发送的补充业务建立请求消息中获取伴随所述VoLTE业务的至少一项补充业务。
可选地，所述处理器1002具体用于，通过如下方式确定所述UE当前所在的服务网络不支持VoLTE业务：确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE业务漫游协议。
可选地，所述处理器1002具体用于，确定存在以下至少一种情况后，确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能：
所述VPLMN不在已经开通VoLTE业务功能的网络白名单中；
所述VPLMN在未开通VoLTE业务功能的黑名单中；
所述VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE漫游协议；
所述VPLMN的代理-呼叫会话控制功能P-CSCF不在支持VoLTE业务功能的白名单中；
所述VPLMN的P-CSCF在不支持VoLTE业务功能的黑名单中。
可选地，所述处理器1002具体用于，通过如下方式确定在所述PS域所述VoLTE业务的语音承载建立失败：
通过所述通信接口1001接收重认证请求RAR消息或会话中止请求ASR消息；
确定所述RAR消息或ASR消息中携带用于指示承载资源不足的指示信息或用于指示资源分配失败的指示信息后，确定在所述PS域所述VoLTE业务的语音承载建立失败。
可选地，所述RAR消息或ASR消息中包括所述VoLTE业务的语音承载建立失败的原因值。
可选地，所述RAR消息或ASR消息中包括的所述VoLTE业务的语音承载建立失败的原因值为所述UE处于PS域的弱覆盖区域。
可选地，所述处理器1002触发所述UE的CSFB业务之前，还用于：
确定所述UE已在电路交换域注册。
可选地，所述处理器1002具体用于，通过以下方式确定所述UE已在电路交换域注册：
从归属用户服务器HSS或归属位置寄存器HLR获取所述UE在电路交换CS网络注册的信息；
根据所述UE在所述CS网络注册的信息，确定所述UE已在电路交换域注册。
可选地，所述UE为VoLTE业务的主叫UE；
所述处理器1002具体用于，通过以下方式触发所述UE的CSFB业务：
通过所述通信接口1001向所述主叫UE发送第一消息，所述第一消息用于触发所述主叫UE发起电路域回落CSFB主叫业务。
可选地，所述第一消息中包括第一原因值，所述第一原因值用于告知所述主叫UE导致所述VoLTE业务不可用的具体原因。
可选地，所述处理器1002通过所述通信接口1001向所述主叫UE发送第一消息之前，还用于：
确定所述主叫UE对应的被叫UE处于振铃前状态。
可选地，所述IMS核心网设备为主叫方服务呼叫会话控制功能I/S-CSCF或主叫方业务集中和连续性应用服务器SCC AS或主叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述UE为VoLTE业务的被叫UE；
所述处理器1002具体用于，通过以下方式触发所述UE的CSFB业务，包括：
通过所述通信接口1001向被叫域选设备发送第二消息，所述第二消息用于指示在所述PS域的被叫业务建立失败，以使所述被叫域选设备触发所述被叫UE的电路域回落CSFB被叫业务。
可选地，所述第二消息中包括第二原因值，所述第二原因值用于告知所述被叫域选设备在所述PS域的被叫建立失败的具体原因。
可选地，所述处理器1002通过所述通信接口1001向被叫域选设备发送第二消息之前，还用于：
确定所述被叫UE处于振铃前状态。
可选地，所述IMS核心网设备为被叫方服务呼叫会话控制功能I/S-CSCF或被叫方业务集中和连续性应用服务器SCC AS或被叫方代理-呼叫会话控制功能P-CSCF。
可选地，所述处理器1002通过所述通信接口1001向被叫域选设备发送第二消息，具体为：
所述被叫方P-CSCF的处理器1002通过所述通信接口1001向所述被叫方I/S-CSCF发送所述第二消息，以使所述被叫方I/S-CSCF将所述第二消息转发给所述被叫域选设备。
从上述内容可知：本申请实施例中，IMS核心网设备接收为UE建立VoLTE业务的请求消息，IMS核心网设备确定无法建立所述VoLTE业务后，触发UE的CSFB业务，从而使得在无法建立VoLTE业务的情况下，直接触发UE的CSFB业务，而无需再尝试建立VoLTE业务，进而提高用户设备的接通成功率，保证UE请求的语音业务和补充业务，确保良好的用户体验，避免导致UE无法使用VoLTE业务接通且耗费处理时间的技术问题。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储信道(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器指令，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请范围。这样，倘若本申请的这些修改和变型属于本申请权利要求的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (38)

  1. 一种业务处理方法，其特征在于，该方法包括：
    互联网协议多媒体子系统IMS核心网设备接收为用户设备UE在分组交换PS域建立长期演进网络语音传输VoLTE业务的请求消息；
    所述IMS核心网设备确定无法在所述PS域建立所述VoLTE业务后，触发所述UE的电路域回落CSFB业务。
  2. 如权利要求1所述的方法，其特征在于，所述IMS核心网设备确定存在以下至少一种情况后，确定无法在所述PS域建立所述VoLTE业务：
    所述IMS核心网设备获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用；
    所述IMS核心网设备确定所述UE当前所在的服务网络不支持VoLTE业务；
    所述IMS核心网设备确定在所述PS域所述VoLTE业务的语音承载建立失败。
  3. 如权利要求2所述的方法，其特征在于，所述IMS核心网设备获取伴随所述VoLTE业务的至少一项补充业务，包括：
    所述IMS核心网设备根据所述UE的签约信息，获取伴随所述VoLTE业务的至少一项补充业务；或者，
    所述IMS核心网设备在所述UE发送的补充业务建立请求消息中获取伴随所述VoLTE业务的至少一项补充业务。
  4. 如权利要求2所述的方法，其特征在于，所述IMS核心网设备确定所述UE当前所在的服务网络不支持VoLTE业务，包括：所述IMS核心网设备确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE业务漫游协议。
  5. 如权利要求4所述的方法，其特征在于，所述IMS核心网设备确定存 在以下至少一种情况后，确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能：
    所述VPLMN不在已经开通VoLTE业务功能的网络白名单中；
    所述VPLMN在未开通VoLTE业务功能的黑名单中；
    所述VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE漫游协议；
    所述VPLMN的代理-呼叫会话控制功能P-CSCF不在支持VoLTE业务功能的白名单中；
    所述VPLMN的P-CSCF在不支持VoLTE业务功能的黑名单中。
  6. 如权利要求2所述的方法，其特征在于，所述IMS核心网设备确定在所述PS域所述VoLTE业务的语音承载建立失败，包括：
    所述IMS核心网设备接收重认证请求RAR消息或会话中止请求ASR消息；
    所述IMS核心网设备确定所述RAR消息或ASR消息中携带用于指示承载资源不足的指示信息或用于指示资源分配失败的指示信息后，确定在所述PS域所述VoLTE业务的语音承载建立失败。
  7. 如权利要求6所述的方法，其特征在于，所述RAR消息或ASR消息中包括所述VoLTE业务的语音承载建立失败的原因值。
  8. 如权利要求7所述的方法，其特征在于，所述RAR消息或ASR消息中包括的所述VoLTE业务的语音承载建立失败的原因值为所述UE处于PS域的弱覆盖区域。
  9. 如权利要求1-8中任一项所述的方法，其特征在于，所述IMS核心网设备触发所述UE的CSFB业务之前，还包括：
    所述IMS核心网设备确定所述UE已在电路交换域注册。
  10. 如权利要求9所述的方法，其特征在于，所述IMS核心网设备确定所述UE已在电路交换域注册，包括：
    所述IMS核心网设备从归属用户服务器HSS或归属位置寄存器HLR获 取所述UE在电路交换CS网络注册的信息；
    所述IMS核心网设备根据所述UE在所述CS网络注册的信息，确定所述UE已在电路交换域注册。
  11. 如权利要求1-10中任一项所述的方法，其特征在于，所述UE为VoLTE业务的主叫UE；
    所述IMS核心网设备触发所述UE的CSFB业务，包括：
    所述IMS核心网设备向所述主叫UE发送第一消息，所述第一消息用于触发所述主叫UE发起电路域回落CSFB主叫业务。
  12. 如权利要求11所述的方法，其特征在于，所述第一消息中包括第一原因值，所述第一原因值用于告知所述主叫UE导致所述VoLTE业务不可用的具体原因。
  13. 如权利要求11所述的方法，其特征在于，所述IMS核心网设备向所述主叫UE发送第一消息之前，还包括：
    所述IMS核心网设备确定所述主叫UE对应的被叫UE处于振铃前状态。
  14. 如权利要求11至13中任一项所述的方法，其特征在于，所述IMS核心网设备为主叫方服务呼叫会话控制功能I/S-CSCF或主叫方业务集中和连续性应用服务器SCC AS或主叫方代理-呼叫会话控制功能P-CSCF。
  15. 如权利要求1-10中任一项所述的方法，其特征在于，所述UE为VoLTE业务的被叫UE；
    所述IMS核心网设备触发所述UE的CSFB业务，包括：
    所述IMS核心网设备向被叫域选设备发送第二消息，所述第二消息用于指示在所述PS域的被叫业务建立失败，以使所述被叫域选设备触发所述被叫UE的电路域回落CSFB被叫业务。
  16. 如权利要求15所述的方法，其特征在于，所述第二消息中包括第二原因值，所述第二原因值用于告知所述被叫域选设备在所述PS域的被叫建立失败的具体原因。
  17. 如权利要求15所述的方法，其特征在于，所述IMS核心网设备向被 叫域选设备发送第二消息之前，还包括：
    所述IMS核心网设备确定所述被叫UE处于振铃前状态。
  18. 如权利要求15至17中任一项所述的方法，其特征在于，所述IMS核心网设备为被叫方服务呼叫会话控制功能I/S-CSCF或被叫方业务集中和连续性应用服务器SCC AS或被叫方代理-呼叫会话控制功能P-CSCF。
  19. 如权利要求18所述的方法，其特征在于，所述IMS核心网设备向被叫域选设备发送第二消息，包括：
    所述被叫方P-CSCF向所述被叫方I/S-CSCF发送所述第二消息，以使所述被叫方I/S-CSCF将所述第二消息转发给所述被叫域选设备。
  20. 一种IMS核心网设备，其特征在于，所述IMS核心网设备包括：通信接口和处理器；
    所述通信接口，用于接收为用户设备UE在分组交换PS域建立长期演进网络语音传输VoLTE业务的请求消息；
    所述处理器，用于确定无法在所述PS域建立所述VoLTE业务后，触发所述UE的电路域回落CSFB业务。
  21. 如权利要求20所述的IMS核心网设备，其特征在于，所述处理器具体用于，确定存在以下至少一种情况后，确定无法在所述PS域建立所述VoLTE业务：
    获取伴随所述VoLTE业务的至少一项补充业务，并确定所述至少一项补充业务不可用；
    确定所述UE当前所在的服务网络不支持VoLTE业务；
    确定在所述PS域所述VoLTE业务的语音承载建立失败。
  22. 如权利要求21所述的IMS核心网设备，其特征在于，所述处理器通过以下方式获取伴随所述VoLTE业务的至少一项补充业务：
    根据所述UE的签约信息，获取伴随所述VoLTE业务的至少一项补充业务；或者，
    在所述UE发送的补充业务建立请求消息中获取伴随所述VoLTE业务的 至少一项补充业务。
  23. 如权利要求21所述的IMS核心网设备，其特征在于，所述处理器具体用于，通过如下方式确定所述UE当前所在的服务网络不支持VoLTE业务：确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能或所述UE所在的VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE业务漫游协议。
  24. 如权利要求23所述的IMS核心网设备，其特征在于，所述处理器具体用于，确定存在以下至少一种情况后，确定所述UE所在的拜访公共陆上移动网VPLMN未开通VoLTE业务功能：
    所述VPLMN不在已经开通VoLTE业务功能的网络白名单中；
    所述VPLMN在未开通VoLTE业务功能的黑名单中；
    所述VPLMN与归属地公共陆地移动网HPLMN之间未签署VoLTE漫游协议；
    所述VPLMN的代理-呼叫会话控制功能P-CSCF不在支持VoLTE业务功能的白名单中；
    所述VPLMN的P-CSCF在不支持VoLTE业务功能的黑名单中。
  25. 如权利要求21所述的IMS核心网设备，其特征在于，所述处理器具体用于，通过如下方式确定在所述PS域所述VoLTE业务的语音承载建立失败：
    通过所述通信接口接收重认证请求RAR消息或会话中止请求ASR消息；
    确定所述RAR消息或ASR消息中携带用于指示承载资源不足的指示信息或用于指示资源分配失败的指示信息后，确定在所述PS域所述VoLTE业务的语音承载建立失败。
  26. 如权利要求25所述的IMS核心网设备，其特征在于，所述RAR消息或ASR消息中包括所述VoLTE业务的语音承载建立失败的原因值。
  27. 如权利要求26所述的IMS核心网设备，其特征在于，所述RAR消息或ASR消息中包括的所述VoLTE业务的语音承载建立失败的原因值为所述 UE处于PS域的弱覆盖区域。
  28. 如权利要求20-27中任一项所述的IMS核心网设备，其特征在于，所述处理器触发所述UE的CSFB业务之前，还用于：
    确定所述UE已在电路交换域注册。
  29. 如权利要求28所述的IMS核心网设备，其特征在于，所述处理器具体用于，通过以下方式确定所述UE已在电路交换域注册：
    从归属用户服务器HSS或归属位置寄存器HLR获取所述UE在电路交换CS网络注册的信息；
    根据所述UE在所述CS网络注册的信息，确定所述UE已在电路交换域注册。
  30. 如权利要求20-29中任一项所述的IMS核心网设备，其特征在于，所述UE为VoLTE业务的主叫UE；
    所述处理器具体用于，通过以下方式触发所述UE的CSFB业务：
    通过所述通信接口向所述主叫UE发送第一消息，所述第一消息用于触发所述主叫UE发起电路域回落CSFB主叫业务。
  31. 如权利要求30所述的IMS核心网设备，其特征在于，所述第一消息中包括第一原因值，所述第一原因值用于告知所述主叫UE导致所述VoLTE业务不可用的具体原因。
  32. 如权利要求30所述的IMS核心网设备，其特征在于，所述处理器通过所述通信接口向所述主叫UE发送第一消息之前，还用于：
    确定所述主叫UE对应的被叫UE处于振铃前状态。
  33. 如权利要求30至32中任一项所述的IMS核心网设备，其特征在于，所述IMS核心网设备为主叫方服务呼叫会话控制功能I/S-CSCF或主叫方业务集中和连续性应用服务器SCC AS或主叫方代理-呼叫会话控制功能P-CSCF。
  34. 如权利要求20-29中任一项所述的IMS核心网设备，其特征在于，所述UE为VoLTE业务的被叫UE；
    所述处理器具体用于，通过以下方式触发所述UE的CSFB业务，包括：
    通过所述通信接口向被叫域选设备发送第二消息，所述第二消息用于指示在所述PS域的被叫业务建立失败，以使所述被叫域选设备触发所述被叫UE的电路域回落CSFB被叫业务。
  35. 如权利要求34所述的IMS核心网设备，其特征在于，所述第二消息中包括第二原因值，所述第二原因值用于告知所述被叫域选设备在所述PS域的被叫建立失败的具体原因。
  36. 如权利要求34所述的IMS核心网设备，其特征在于，所述处理器通过所述通信接口向被叫域选设备发送第二消息之前，还用于：
    确定所述被叫UE处于振铃前状态。
  37. 如权利要求34至36中任一项所述的IMS核心网设备，其特征在于，所述IMS核心网设备为被叫方服务呼叫会话控制功能I/S-CSCF或被叫方业务集中和连续性应用服务器SCC AS或被叫方代理-呼叫会话控制功能P-CSCF。
  38. 如权利要求37所述的IMS核心网设备，其特征在于，所述处理器通过所述通信接口向被叫域选设备发送第二消息，具体为：
    所述被叫方P-CSCF的处理器通过所述通信接口向所述被叫方I/S-CSCF发送所述第二消息，以使所述被叫方I/S-CSCF将所述第二消息转发给所述被叫域选设备。
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