WO2016176816A1 - 电路域回落的方法、网络设备和系统 - Google Patents

电路域回落的方法、网络设备和系统 Download PDF

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Publication number
WO2016176816A1
WO2016176816A1 PCT/CN2015/078247 CN2015078247W WO2016176816A1 WO 2016176816 A1 WO2016176816 A1 WO 2016176816A1 CN 2015078247 W CN2015078247 W CN 2015078247W WO 2016176816 A1 WO2016176816 A1 WO 2016176816A1
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WIPO (PCT)
Prior art keywords
network device
network
request message
message
serving cell
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PCT/CN2015/078247
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English (en)
French (fr)
Inventor
崇卫微
吴晓波
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201580073691.0A priority Critical patent/CN107211329B/zh
Priority to EP15891068.7A priority patent/EP3280178B1/en
Priority to PCT/CN2015/078247 priority patent/WO2016176816A1/zh
Publication of WO2016176816A1 publication Critical patent/WO2016176816A1/zh
Priority to US15/803,581 priority patent/US10575219B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information

Definitions

  • Embodiments of the present invention relate to the field of communications, and in particular, to a method, network device, and system for circuit domain fallback.
  • the second generation (2G) network for example, a global system of mobile communication (GSM) network
  • a third generation (3G) network for example, Wideband code division multiple access (WCDMA) networks
  • LTE long term evolution
  • LTE networks have begun to cover traffic hotspots, coexisting with GSM networks or WCDMA networks.
  • a user equipment (UE) in an LTE network initiates or performs a circuit switched (CS) service, it can fall back from the LTE network to the 2G network or the 3G network to continue the processing of the CS service.
  • CSFB circuit switched fallback
  • the UE may select multiple ways to fall back from the LTE network to the 2G or 3G network, for example, based on the redirection method, based on the PS handover mode, or based on a single radio voice call continuity (SRVCC) handover mode.
  • SRVCC radio voice call continuity
  • the UE and the network device for example, the MME, the eNodeB, and the like, perform multiple signaling interactions.
  • the UE if the UE is in the serving cell handover process, the UE initiates voice.
  • the service triggers the network device, for example, the MME, the eNodeB, and the like to perform the CSFB, and the network device selects to perform the serving cell handover process, so that the voice service initiated by the UE cannot be successfully established.
  • the embodiment of the present invention provides a method, a network device, and a system for the CSFB, so as to improve the success rate of the establishment of the CS service when the CSFB triggered by the UE initiates the CS service and the serving cell handover process of the UE conflict.
  • an embodiment of the present invention provides a method for a circuit domain to fall back to a CSFB, where the method is used for a network device in a first network, where the method includes:
  • the second network is a network supporting circuit domain services
  • the network device moves the UE into the second network.
  • the source serving cell of the UE is a first cell
  • the network device is an access network control device
  • the network device determines a serving cell handover process of the UE.
  • the end includes:
  • the path switch request message sent by the message indicates that the serving cell of the UE is the second cell.
  • the network device determines that the UE needs to be moved to the second network before the serving cell handover process of the UE ends.
  • a UE context update request message or an initial UE context setup request message sent by the core network device is received before the end of the serving cell handover process of the UE, where the UE context update request message or Initial UE context setup request message includes circuitry a domain fallback indication message, where the UE context update request message or the initial UE context setup request message is used to instruct the network device to move the UE to the second network;
  • the network device determines that the UE needs to be moved to the second network according to the UE context update request message or the initial UE context setup request message sent by the core network device.
  • the UE context update request message or the initial UE context setup request message further includes a single wireless voice call continuity SRVCC.
  • the enhanced circuit domain falls back to the eCSFB operation feasible indication information.
  • the network device moves the UE Before the second network, the method further includes:
  • the network device sends a UE context update response message or an initial UE context setup response message to the core network device.
  • the network device moving the UE to the second network includes:
  • the network device sends a radio resource control connection release message to the UE, where the radio resource control connection release message is used to trigger the UE to be based on the redirected CSFB or the CSFB based on the different system cell change, or
  • the network device sends a handover request message to the core network device, where the handover request message is used to trigger the CSFB based on packet service handover or the eCSFB based on SRVCC.
  • the network device is an evolved base station, and the first network is a long term evolution network, where the The second network is a second generation network or a third generation network.
  • the network device is a core network device, and the determining, by the network device, that the serving cell handover process of the UE ends:
  • the location report message is sent by the access network control device to the network device after determining that the location of the UE is changed from the first cell to the second cell, the first cell and the The second cell is a cell managed by the access network control device;
  • the network device determines that the UE needs to be moved to the second network before the end of the serving cell handover process of the UE, including:
  • the network device determines that an extended service request message of the UE has been received before receiving the location report message;
  • the network device determines that the UE needs to be moved to the second network according to the extended service request message.
  • the source serving cell of the UE is a first cell
  • the network device is a core network device, where the determining, by the network device, that the serving cell handover process of the UE ends:
  • the network device Determining, by the network device, that the serving cell handover procedure of the UE ends according to the bearer update response message or the bearer creation response message sent by the serving gateway, where the bearer update response message or the bearer creation response message is sent by the serving gateway a bearer update request or a bearer creation request response message sent by the network device, where the bearer update request or the bearer creation request is received by the network device when the path switch request message or the handover complete message sent by the access network control device is received
  • the path switch request message or the handover complete message sent by the serving gateway indicates that the serving cell is the second cell;
  • the network device determines that the UE needs to be moved to the second network before the end of the serving cell handover process of the UE, including:
  • the network device determines that an extended service request message of the UE has been received before receiving the bearer update/create response message;
  • the network device determines that the UE needs to be moved to the second network according to the extended service request message.
  • the network device moving the UE to the second network includes:
  • the network device sends a UE context update request message or an initial UE context setup request message to the access network control device, where the UE context update request message or the initial UE context setup request message includes circuit domain fallback indication information.
  • the context update request message or the initial UE context setup request message is used to instruct the access network control device to move the UE to the second network.
  • the network device determines that the UE supports an enhanced circuit domain fallback eCSFB based on a single wireless voice call continuity SRVCC;
  • the UE context update request message or the initial UE context setup request message further includes an SRCSCC-based eCSFB operation feasible indication information.
  • the determining, by the network device, that the UE supports the SRCSCC-based eCSFB includes:
  • the network device acquires the identifier information of the UE, where the identifier information of the UE includes at least one of the following: an international mobile station device identifier IMEI, an international mobile subscriber identity IMSI;
  • the network device determines, according to the identification information of the UE, that the UE supports an SRVCC-based eCSFB. .
  • the network device is a mobility management entity
  • the access network control device is an evolved base station
  • the second network is For the second generation network or the third generation network
  • the first network is a long term evolution network.
  • an embodiment of the present invention provides a network device, where the network device includes:
  • a first determining unit configured to determine that the serving cell handover process of the user equipment UE ends
  • a second determining unit configured to determine that the UE needs to be moved to the second network before the first determining unit determines that the serving cell handover process of the UE ends, where the second network is a supporting circuit domain Business network
  • a mobile unit configured to move the UE into the second network according to a result determined by the second determining unit.
  • the source serving cell of the UE is a first cell
  • the network device is an access network control device
  • the first determining unit is specifically configured to determine that the serving cell handover process of the UE ends according to the access message sent by the UE in the second cell, where the second cell and the first cell are both the network device Managed community; or,
  • the first determining unit is configured to determine, according to the path switch response message sent by the core network device, that the serving cell handover process of the UE ends, where the path switch response message is that the core network device receives the network device.
  • the path switch request message sent by the sent path switch request message indicates that the serving cell of the UE is the second cell.
  • the second determining unit is specifically configured to determine, at the end, that the first determining unit determines that the serving cell handover process of the UE ends.
  • the UE context update request message or the initial UE context setup request message sent by the core network device has been received, where the UE context update request message or the initial UE context setup request message includes circuit domain fallback indication information, the UE context An update request message or an initial UE context setup request message is used to instruct the network device to move the UE to the second network;
  • the second determining unit determines that the UE needs to be moved to the second network according to the UE context update request message or the initial UE context setup request message sent by the core network device.
  • the UE context update request message or the initial UE context setup request message further includes a single A wireless voice call continuity SRVCC enhanced circuit domain fallback eCSFB operation feasible indication information.
  • the network device further includes:
  • a response unit configured to send a UE context update response message or an initial UE context setup response message to the core network device.
  • the mobile unit is specifically configured to send a radio resource control connection release message to the UE, a radio resource control connection release message for triggering the UE to be based on a redirected CSFB or a CSFB based on a different system cell change; or
  • the mobile unit is specifically configured to send a handover request message to the core network device, where the handover request message is used to trigger the CSFB based on packet service handover or the CSFB based on SRVCC.
  • the network device is an evolved base station, and the first network is a long term evolution network, where the The second network is a second generation network or a third generation network.
  • the network device is a core network device
  • the first determining unit is specifically configured to receive a location report message sent by the access network control device, where the first determining unit determines, according to the location report message, that the serving cell handover process of the UE ends, and the location report message is The access network control device sends the first cell and the second cell to the network device after determining that the location of the UE is changed from the first cell to the second cell. a cell managed by the control device;
  • the second determining unit is specifically configured to determine that an extended service request message of the UE has been received before the first determining unit receives the location report message, where the second determining unit determines according to the extended service request message.
  • the UE needs to be moved to the second network.
  • the source serving cell of the UE is a first cell
  • the network device is a core network device
  • the first determining unit is specifically configured to receive a bearer update response or a bearer sent by the serving gateway.
  • the bearer update response or the bearer creation response message is a response message sent by the serving gateway to the bearer update request or the bearer creation request sent by the network device, where the bearer update request or the bearer creation request is
  • the network device receives the path switch request message or the handover complete message sent by the access network control device, the path switch request message or the handover complete message indicates that the serving cell is the second cell.
  • the second determining unit determines that an extended service request message of the UE has been received before the first determining unit receives the bearer update response or bearer creation response message;
  • the second determining unit determines that the UE needs to be moved to the second network according to the extended service request message.
  • the mobile unit is specifically configured to The network access control device sends a UE context update request message or an initial UE context setup request message, where the UE context update request message or the initial UE context setup request message includes circuit domain fallback indication information, the UE context update request message or an initial The UE context setup request message is used to instruct the access network control device to move the UE to the second network.
  • the network device further includes a third determining unit, configured to determine that the UE supports an enhancement based on a single wireless voice call continuity SRVCC The circuit domain falls back to eCSFB;
  • the UE context update request message or the initial UE context setup request message further includes an SRCSCC-based eCSFB operation feasible indication information.
  • the third determining unit is specifically configured to determine, according to the attach request of the UE or the tracking area update request message, the UE support SRCSC-based eCSFB; or,
  • the third determining unit acquires the identifier information of the UE, where the identifier information of the UE is at least The following includes an international mobile station device identifier IMEI, a national mobile subscriber identity IMSI, and the third determining unit determines, according to the identifier information of the UE, that the UE supports an SRVCC-based eCSFB.
  • the network device is a mobility management entity
  • the access network control device is an evolved base station
  • the second network is A second generation network or a third generation network, the first network being a long term evolution network.
  • an embodiment of the present invention provides a system for circuit domain fallback, where the system includes:
  • At least one user equipment UE At least one user equipment UE
  • a network device of any of the possible implementations of the second aspect is provided.
  • the method, the device, and the system in the embodiment of the present invention may move the UE to the network supporting the CS service after the UE is in the process of the serving cell handover process, and the UE is in the process of the serving cell handover process.
  • the CS service of the UE can be continuously executed, thereby improving the success rate of the CS service establishment.
  • FIG. 1 is a flowchart of a method for circuit domain fallback according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for circuit domain fallback according to another embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for circuit domain fallback according to another embodiment of the present invention.
  • FIG. 4 is a flowchart of a method for circuit domain fallback according to another embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for circuit domain fallback according to another embodiment of the present invention.
  • FIG. 6 is a structural diagram of a network device according to another embodiment of the present invention.
  • FIG. 7 is a structural diagram of a network device according to another embodiment of the present invention.
  • FIG. 8 is a schematic diagram of networking of a system for circuit domain fallback according to another embodiment of the present invention.
  • the method and the device in the embodiments of the present invention may be implemented by using a network device, where the network device includes the access network control device and the core network device, which are not limited to any one of the following or more than one.
  • the access network control device may be an evolved base station eNodeB, a radio network controller, or a base station, etc.
  • the core network device may be a mobility management entity MME or the like.
  • the user and the user equipment have the same meaning for the network device.
  • FIG. 1 is a flowchart of a method for circuit domain fallback according to an embodiment of the present invention. The method is applicable to a network device in a first network, as shown in the figure, including:
  • the network device determines that the serving cell handover process of the UE ends.
  • the UE may perform handover between different cells, thereby changing the serving cell, so that the location of the UE changes.
  • the UE is the first cell and the destination serving cell is the second cell before the handover, and the serving cell is the second cell after the handover is completed.
  • the network device may be an access network control device, such as an eNodeB, which manages the second cell. If the source cell of the UE is the first cell and the first cell is also managed by the eNodeB, after the handover is completed, the eNodeB receives the access message sent by the UE in the second cell, for example, a handover completion message or a handover confirmation message. The eNodeB can determine that the serving cell handover procedure in which the UE is located ends.
  • an access network control device such as an eNodeB, which manages the second cell.
  • the eNodeB needs to send a path switch request message to the MME after receiving the access message sent by the UE in the second cell. After receiving the path switch response message sent by the MME according to the path switch request message, the eNodeB determines that the serving cell handover process in which the UE is located ends.
  • the network device may also be a core network device, for example, an MME, and the MME may determine, in various manners, that the serving cell handover procedure of the UE ends.
  • MME access Receiving a location report message sent by the access network control device, for example, the eNodeB, where the location report message may indicate a location identifier of the UE, for example, a cell identifier, a tracking area identifier, etc., and the MME reports the message according to the received location.
  • the location identifier of the UE may determine that the UE's serving cell handover procedure ends.
  • the location identifier message received by the MME indicates that the cell identifier of the serving cell where the UE is located is the second cell, that is, the location report message is determined by the eNodeB.
  • the first cell and the second cell are both cells managed by the eNodeB, and the MME may determine that the serving cell change process in which the UE is located ends, for example, if the location report message is If the tracking area identifier of the UE is changed, the network device may determine that the serving cell handover process of the UE is completed. It should be noted that these are only examples, and the embodiment of the present invention is not limited thereto.
  • the core network device may send a location subscription message to the access network control device, and subscribe to the information changed by the UE serving cell, thereby obtaining the location report of the UE sent by the access network control device.
  • the core network device will receive a location report message sent by the access network control device.
  • the source serving cell of the UE is the first cell
  • the core network device receives the bearer update response message or the bearer creation response message sent by the serving gateway, where the bearer update response message or the bearer creation response message is the serving gateway to the core network.
  • the bearer update request or the bearer creation request response message sent by the device, and the bearer update request or the bearer creation request message is sent to the service by the core network device when receiving the path switch request message or the handover complete message sent by the access network control device.
  • the gateway sends, wherein the path switch request message indicates that the serving cell is the second cell, and the core network device can determine that the serving cell handover process of the UE ends according to the bearer update response or the bearer creation response message.
  • the network device determines that it is determined that the UE needs to be moved to the second network before step 101, wherein the second network is a network supporting circuit domain services.
  • the UE When the UE initiates a CS service in the first network, for example, initiates a voice service caller, or acts as The called party of the voice service will send an extended service request message to the core network device, and indicate in the message that the calling CSFB or the called CSFB service needs to be performed.
  • the core network device After receiving the extended service request message, the core network device determines that the CSFB needs to move the UE to the second network supporting the CS service, and sends a UE context update message or an initial UE context setup request message to the access network control device, where
  • the UE context update message or the initial UE context setup request message may include circuit domain fallback indication information for indicating that the access network control device moves the UE to the second network supporting the CS service, and may further include an SRVCC-based enhancement circuit.
  • the domain fallback eCSFB operation feasible indication information is used to instruct the access network control device to perform the CSFB operation based on the SRVCC mode.
  • the UE context update message or the initial UE context establishment request may also include air interface capability information of the UE.
  • the access network control device determines that the UE needs to be moved to the second network according to the UE context update request message or the initial UE context setup request message sent by the core network device.
  • the UE may initiate a CS service before the serving cell handover, or may initiate a CS service during the serving cell handover.
  • the access network control device Taking the network device as the access network control device as an example, if the UE context update request message or the initial UE context setup request message sent by the core network device is received before the end of the serving cell handover process of the UE, where the UE context update request message or The initial UE context setup request message includes circuit domain fallback indication information for instructing the access network control device to move the UE to the second network supporting the circuit domain, and the access network control device determines that the UE needs to be moved before step 101. Go to the second network.
  • the core network device determines that it is determined that the UE needs to be moved to before step 101. In the second network.
  • the network device moves the UE to the second network.
  • the network device can move the UE into the second network in a variety of ways.
  • the MME is used as an example of the MME, and the MME sends a UE context update request message or an initial UE context setup request message to the access network control device, for example, the eNodeB, and includes the circuit domain fallback in the message. Instructing information, the eNodeB will move the UE to the second network according to the circuit domain fallback indication information. Further, before the step 103, if the MME determines that the UE supports the SRVCC handover, the MME may further include an SRCSCC-based eCSFB operation feasible indication information in the UE context update request message or the initial UE context setup request message, so that the eNodeB can follow the indication.
  • the UE context update message or the initial UE context setup request message may further include the air interface capability information of the UE.
  • the MME may determine that the UE supports the SRVCC handover according to the UE's attach request or the tracking area update request message, or the MME may also obtain the identifier information of the UE, and determine that the UE supports the SRVCC handover according to the identifier information of the UE, where the identifier information of the UE includes at least The following one: International Mobile Station Equipment Identity IMEI and International Mobile Subscriber Identity IMSI. It should be noted that the above descriptions are only examples, and the embodiments of the present invention are limited thereto.
  • the eNodeB is configured as an eNodeB, and the eNodeB may send a radio resource control connection release message to the UE, and trigger the redirection based on the CSFB information carrying different indication information in the radio resource control connection release message.
  • CSFB or CSFB based on inter-system cell change thereby moving the UE to the second network supporting the CS service, or the eNodeB may also send a handover request message to the core network device, for example, the MME, by carrying different in the handover request message
  • the CSFB information triggers CSFB based on packet service switching or eCSFB based on SRVCC.
  • the first network may be an LTE network
  • the access network control device is an eNodeB
  • the core network device is an MME
  • the second network may be a GSM network or a WCDMA network. It should be noted that the above is only an example, and the embodiment of the present invention is not limited thereto.
  • the network device may switch over the serving cell of the UE.
  • the UE is moved to the network supporting the CS service, so that the CS service of the UE can continue to be executed, thereby improving the success rate of the CS service establishment.
  • the first network is an LTE network
  • the network device is an eNodeB
  • the second network is a third generation.
  • a network for example, a WCDMA network, is exemplified, and it is to be understood that the present invention is not limited thereto. As shown, it includes:
  • the UE sends an extended service request message to the MME in the first cell.
  • the UE When the UE is in an idle state and camps on the first cell, if the UE needs to initiate a CS service, for example, the UE needs to initiate a voice service call or the UE is called as a voice service, the UE will establish a connection in the first cell via the eNodeB, and An extended service request message is sent to the MME.
  • a CS service for example, the UE needs to initiate a voice service call or the UE is called as a voice service
  • the UE will establish a connection in the first cell via the eNodeB, and An extended service request message is sent to the MME.
  • the UE When the UE is already in the connected state and the source serving cell is the first cell under the management of the eNodeB, if the UE needs to initiate the CS service, for example, the UE initiates a voice service call or the UE is called as a voice service, the UE will be in the first cell via The eNodeB sends an extended service request message to the MME.
  • the UE sends a measurement report message to the eNodeB in the first cell.
  • the UE Since the UE continuously performs measurement on the first cell and the neighboring cell of the first cell, the UE sends a measurement report message to the eNodeB in the first cell, where the measurement report message may include signal quality information of the neighboring cell of the first cell, for example, Signal quality information of the second cell under the management of the eNodeB.
  • the eNodeB sends a handover command message to the UE to instruct the UE to switch to the second cell.
  • the eNodeB may determine, according to the measurement report message received in step 202, that the UE switches to the second cell, for example, the signal quality of the second cell is higher than a preset handover threshold, and, for example, the signal quality of the second cell is better than that of the first cell.
  • the signal quality the eNodeB determines that the UE switches to the second cell, and sends a handover command message to the UE to instruct the UE to switch to the second cell.
  • step 201 may also be after the step 202 or the step 203, and the embodiment of the present invention is not limited thereto.
  • the eNodeB receives the UE context update message or the initial UE context setup request message sent by the MME.
  • the MME triggers the CSFB to move the UE into the WCDMA network according to the extended service request message received in step 201.
  • the eNodeB will receive the UE context update message or the initial UE context setup request message sent by the MME, where the UE context update message or the initial UE context setup request message includes circuit domain fallback indication information, so that the eNodeB can update the message according to the UE context. Or the initial UE context setup request message determines that the UE needs to be moved to the second network.
  • the UE context update message or the initial UE context setup request message may further include an SRVCC-based eCSFB operation feasible indication information, so that the eNodeB may determine that the UE needs to adopt the SRVCC handover mode according to the SRVCC-based eCSFB operation feasible indication information.
  • the UE context update message or the initial UE context setup message may further include the air interface capability information of the UE, so that the eNodeB may determine, according to the information, to move the UE to the second network in an appropriate manner.
  • the eNodeB cannot immediately process the circuit domain fallback of the UE, and the eNodeB can record the information that the UE needs to perform circuit domain fallback.
  • the eNodeB can buffer the received UE context update message or initial.
  • UE context establishment request message for example, the eNodeB may also include information not limited to the following: circuit domain fallback operation state, supported circuit domain fallback indication information, UE context, etc., it should be noted that, here is only an example. The embodiments of the present invention are not limited thereto.
  • the eNodeB receives the handover complete message or the handover confirmation message sent by the UE in the second cell.
  • the UE Since the eNodeB and the UE are in the handover process in step 202, 203, after the UE completes the serving cell handover, the UE will send a handover complete message or a handover acknowledgement message in the second cell, and the eNodeB completes the handover according to the received UE in the second cell. After the message or handover confirmation message, it is determined that the serving cell of the UE is changed from the first cell to the second cell.
  • the eNodeB sends a UE context update response message or an initial UE context setup response message to the MME.
  • the eNodeB needs to move the UE to the second network, and sends a UE context update response message or an initial UE context setup response message to the MME to notify the MME that the context update is successful or successful. For example, if the eNodeB receives the UE context update message sent by the MME in step 204, the eNodeB may send a UE context update response message to the MME. For example, if the eNodeB receives the initial UE context setup request message sent by the MME in step 204, The eNodeB may send an initial UE context setup response message to the MME.
  • step 206 may be completed before 205, or may be completed after step 205, which is not limited by the embodiment of the present invention.
  • the eNodeB may send the UE context update response message or the initial UE context setup response message to the MME according to the information that the recorded UE needs to perform the circuit domain fallback. .
  • the eNodeB sends a handover request message to the MME.
  • the eNodeB Since it is determined in step 204 that the UE needs to be moved to the second network, the eNodeB records the information that the UE needs to perform circuit domain fallback, so after step 205, the eNodeB initiates a handover request message to the MME according to the information, triggering the UE to be based on the packet.
  • the switched CSFB or the SRVCC based CSFB moves the UE into the second network. After the UE moves to the second network, the CS service will be initiated and executed on the second network supporting the CS service.
  • step 207 the eNodeB may also trigger the CSFB process of the UE to move the UE to the second network.
  • the foregoing method step 103 has been described, and details are not described herein again.
  • the eNodeB may move the UE to the network supporting the CS service after processing the serving cell handover procedure of the UE. So that the CS service of the UE can continue to be executed. Thereby improving the success rate of CS service establishment.
  • FIG. 3 is a flowchart of a method for circuit domain fallback according to another embodiment of the present invention.
  • the first network is an LTE network
  • the network device is an eNodeB1 and an eNodeB2
  • the second network is A third generation network, for example, a WCDMA network, is exemplified, and it is to be understood that the present invention is not limited thereto. As shown, it includes:
  • the eNodeB2 receives the handover complete message or the handover confirmation message sent by the UE in the second cell.
  • the eNodeB1 When the UE switches from the first cell managed by the eNodeB1 to the second cell managed by the eNodeB2, where there is an X2 interface between the eNodeB1 and the eNodeB2, the eNodeB1 will initiate an X2 interface handover procedure. After the UE completes the serving cell handover, the second cell managed by the eNodeB2 sends a handover complete message or a handover confirmation message to the eNodeB2.
  • the eNodeB2 sends a path switch request message to the MME.
  • the eNodeB 2 Since the X2 interface is handed over, the eNodeB 2 will send a path switch request message to the MME to indicate that the user plane bearer is switched.
  • the UE sends an extended service request message to the MME in the second cell.
  • the UE If the UE needs to initiate a CS service, for example, the UE initiates a voice service call or the UE is called as a voice service, the UE will send an extended service request message to the MME via the eNodeB2 in the second cell.
  • the eNodeB2 receives the UE context update message or the initial UE context setup request message sent by the MME.
  • the MME triggers the CSFB to move the UE into the WCDMA network according to the extended service request message received in step 303.
  • the eNodeB2 receives the UE context update message or the initial UE context setup request message sent by the MME, where the UE context update message or the initial UE context setup request message includes circuit domain fallback indication information, so that the eNodeB2 can return the indication information according to the circuit domain. It is determined that the UE needs to be moved to the second network.
  • the UE context update message or the initial UE context setup request message may also be In order to support the SRVCC-based eCSFB operation feasible indication information, the eNodeB2 can determine that the UE needs to be moved to the second network by using the SRVCC switching mode according to the SRVCC-compliant eCSFB operation feasible indication information.
  • the UE context update message or the initial UE context setup message may further include the air interface capability information of the UE, so that the eNodeB may determine, according to the information, to move the UE to the second network in an appropriate manner.
  • the eNodeB2 Since the eNodeB2 is still in the handover process at this time, the eNodeB2 cannot immediately process the circuit domain fallback of the UE, and the eNodeB2 can record the information that the UE needs to perform circuit domain fallback. For example, the eNodeB2 can buffer the received UE context update message or the initial UE context. For example, the eNodeB2 may also include the following information: the circuit domain fallback operation state, the supported circuit domain fallback indication information, the context of the UE, etc., it should be noted that, here is only an example, this The embodiments of the invention are not limited thereto.
  • the eNodeB2 receives the path switch response message sent by the MME.
  • the eNodeB2 After receiving the path switch response message sent by the MME according to the path switch request message in step 301, the eNodeB2 determines that the serving cell change process in which the UE is located ends.
  • the eNodeB2 sends a UE context update response message or an initial UE context setup response message to the MME.
  • the eNodeB2 sends a UE context update response message or an initial UE context setup response message to the MME according to the determination in step 304 that the UE needs to be moved to the second network, and is used to notify the MME that the context update of the UE is successful or successful. For example, if the eNodeB2 receives the UE context update message sent by the MME in step 304, the eNodeB2 may send a UE context update response message to the MME. For example, if the eNodeB2 receives the initial UE context setup request message sent by the MME in step 304, The eNodeB 2 may send an initial UE context setup response message to the MME.
  • step 306 may be completed before 305, or may be completed after step 305, which is not limited by the embodiment of the present invention.
  • the eNodeB2 can be recorded according to the The UE needs to perform information of circuit domain fallback to send a UE context update response message or an initial UE context setup response message to the MME.
  • the eNodeB2 sends a radio control connection release message to the UE.
  • the eNodeB2 Since it is determined in step 304 that the UE needs to be moved to the second network, the eNodeB2 records the information that the UE needs to perform circuit domain fallback, so after step 305, the eNodeB2 sends a radio control connection release message to the UE according to the information, by The radio resource control connection release message carries different CSFB information indicating that the redirection based CSFB or the CSFB based on the different system cell change is used, thereby moving the UE to the second network supporting the CS service. After the UE moves to the second network, the CS service will be initiated and executed on the second network supporting the CS service.
  • the eNodeB may also trigger the UE's CSFB process to move the UE to the second network.
  • the foregoing method step 103 has been described, and details are not described herein again.
  • the eNodeB may move the UE to the network supporting the CS service after processing the serving cell handover procedure of the UE. Therefore, the CS service of the UE can be continuously executed, thereby improving the success rate of the CS service establishment.
  • FIG. 4 is a flowchart of a method for circuit domain fallback according to another embodiment of the present invention.
  • the first network is still an LTE network
  • the network device is an MME
  • the second network is a third.
  • Generation networks for example, WCDMA networks, are exemplified, and it is to be understood that the present invention is not limited thereto. As shown, it includes:
  • the UE sends an extended service request message to the MME in the first cell.
  • the UE sends a measurement report message to the eNodeB in the first cell.
  • the eNodeB sends a handover command message to the UE to instruct the UE to switch to the second cell.
  • steps 401-403 can also be referred to the steps 201-203, and the step 401 can also be after the step 402 or the step 403, and the embodiment of the present invention is not limited thereto.
  • the MME sends a UE context update message or an initial UE context setup request message to the eNodeB.
  • the MME may trigger the CSFB to move the UE into the WCDMA network according to the extended service request message received in step 401.
  • the MME determines that the UE needs to be moved to the WCDMA network, and sends a UE context update message or an initial UE context setup request message to the eNodeB, where the UE context update message or the initial UE context setup request message includes circuit domain fallback indication information, thereby
  • the eNodeB may determine that the UE needs to be moved to the second network according to the circuit domain fallback indication information.
  • the MME may obtain the UE supporting the SRVCC handover capability indication information in a plurality of manners, so that the UE context update message or the initial UE context setup request message may include the SRVCC-based eCSFB operation feasible indication information, so that the eNodeB can be based on the support.
  • the eCSFB operation feasible indication information of the SRVCC determines that the UE needs to be moved to the second network based on the SRVCC handover mode.
  • the UE context update message or the initial UE context setup message may further include the air interface capability information of the UE, so that the eNodeB may determine, according to the information, to move the UE to the second network in an appropriate manner.
  • the MME may obtain the UE support according to the UE's attach request message or the tracking area update message. Indicates the SRVCC switching capability.
  • the identifier information of the UE and the corresponding relationship supporting the SRVCC handover capability may be saved, where the identifier information of the UE includes at least one of the following: an International Mobile Station Equipment Identity (IMEI) of the UE or an International Mobile Subscriber Identity (IMSI) of the UE.
  • IMEI International Mobile Station Equipment Identity
  • IMSI International Mobile Subscriber Identity
  • the MME may obtain the identifier information of the UE, and obtain the indication information that the UE supports the SRVCC handover capability according to the identifier information of the UE. It should be noted that the description herein is merely illustrative, and the present invention is not limited thereto.
  • the MME sends a location report control message to the eNodeB.
  • the MME may send a location subscription message to the eNodeB to subscribe to information of the UE serving cell change. For example, the MME sends a Location Reporting Control message to the eNodeB indicating the eNodeB's service at the UE. The location information of the UE is reported when the cell becomes another cell under the eNodeB. It should be noted that the step 405 is not limited to be performed after 404, and the MME may also send the location report control message before 401, or may send the location report control message at any time between 401 and 404, which is not in the embodiment of the present invention. Limited to this.
  • the eNodeB receives the handover complete message or the handover confirmation message sent by the UE in the second cell.
  • the eNodeB sends a location report to the MME.
  • the eNodeB Since the eNodeB is in the handover process, the eNodeB cannot process the UE context update message or the initial UE context setup request message received in step 404. After determining that the serving cell of the UE is the second cell, the eNodeB sends a location report to the MME, and carries the current serving cell of the UE, that is, the cell identifier of the second cell, in the location report message.
  • the MME sends a UE context update message or an initial UE context setup request message to the eNodeB.
  • the MME receives the location report message sent by the eNodeB. Since the location report message indicates that the serving cell of the UE is the second cell, the MME determines that the serving cell of the UE has been changed from the first cell to the second cell. Further, since the serving cell of the UE is still in the LTE network, the MME may determine that the operation of moving the UE to the WCDMA network in step 404 is not successful, and the MME still needs to move the UE into the WCDMA network.
  • the MME moves the UE into the WCDMA network by sending a UE Context Update message or an Initial UE Context Setup Request message to the eNodeB.
  • a UE Context Update message or an Initial UE Context Setup Request message to the eNodeB.
  • the MME to send the UE context update message or the initial UE context setup request message, refer to step 404, and details are not described herein again.
  • the eNodeB sends a UE context update response message or an initial UE context setup response message to the MME.
  • the eNodeB sends a UE context update response message or an initial UE context setup response message to the MME, to notify the MME that the context update of the UE is successful or successful.
  • the eNodeB sends a handover request message to the MME.
  • the eNodeB determines to move the UE into the second network using the packet handover based CSFB or the SRVCC based CSFB according to the UE context update response message or the initial UE context setup response message received in step 408.
  • the eNodeB initiates a handover request message to the MME, and indicates that the packet switching based CSFB or the SRVCC based CSFB is adopted by the corresponding CSFB information.
  • the eNodeB may also trigger the CSFB process of the UE to move the UE to the second network in other manners.
  • the foregoing method step 103 has been described, and details are not described herein again.
  • the MME cannot process the circuit domain fallback of the UE immediately because the eNodeB and the MME are still processing the serving cell handover procedure of the UE, and the MME can record the information that the UE needs to perform the circuit domain fallback, for example, the MME.
  • the received UE context update message or the initial UE context setup request message may be buffered.
  • the MME may also cache including information not limited to: circuit domain fallback operation state, supported circuit domain fallback indication information, UE context, etc. It should be noted that the embodiments herein are merely examples, and the embodiments of the present invention are not limited thereto.
  • the MME may move the UE to the network supporting the CS service after processing the serving cell handover procedure of the UE. Therefore, the CS service of the UE can be continuously executed, thereby improving the success rate of the CS service establishment.
  • FIG. 5 is a flowchart of a method for circuit domain fallback according to another embodiment of the present invention.
  • the first network is still an LTE network
  • the network device is an MME
  • the second network is a third.
  • Generation networks for example, WCDMA networks, are exemplified, and it is to be understood that the present invention is not limited thereto.
  • the embodiment of the present invention differs from the embodiment shown in FIG. 4 in that the serving cell of the UE is changed from the first cell managed by the eNodeB1 to the second cell managed by the eNodeB2.
  • the eNodeB 2 Since the X2 interface is handed over, the eNodeB 2 will send a path switch request message to the MME to indicate that the user plane bearer is switched.
  • steps 501 to 504 refer to steps 401 to 404, and details are not described herein again.
  • the eNodeB2 receives the handover complete message or the handover confirmation message sent by the UE in the second cell.
  • the MME receives the path switch request message sent by the eNodeB2 to indicate that the user plane bearer is switched.
  • the eNodeB2 After receiving the handover complete message or the handover confirmation message sent by the UE in the second cell, the eNodeB2 sends a path switch request message to the MME because the X2 interface handover occurs.
  • the MME receives the path switch request message sent by the eNodeB2 to indicate the handover of the user plane bearer, where the path switch request message includes new location information of the UE, such as a tracking area identifier or a serving cell identifier.
  • the MME determines that the location of the UE is changing according to the Path Switch Request message.
  • the MME sends a bearer update request or a bearer creation request message to the serving gateway.
  • the MME sends a bearer update request or a bearer creation request message to the serving gateway according to the path switch request message received in step 506.
  • the MME receives a bearer update response or a bearer creation response message sent by the serving gateway.
  • the serving gateway sends a bearer update response or a bearer creation response message according to the bearer update request or the bearer creation request message received in step 507.
  • the MME After receiving the bearer update response or bearer setup response message, the MME confirms that the serving cell handover procedure of the UE ends.
  • the MME sends a path switch response message to the eNodeB2.
  • the MME sends a UE context update message or an initial UE context setup request message to the eNodeB2.
  • the MME may determine that the operation of moving the UE to the WCDMA network in step 504 is not successful, and the MME still needs to move the UE into the WCDMA network.
  • the MME moves the UE into the WCDMA network by transmitting a UE Context Update message or an Initial UE Context Setup Request message to the eNodeB2.
  • a UE Context Update message or an Initial UE Context Setup Request message to the eNodeB2.
  • the eNodeB2 sends a UE context update response message or an initial UE context setup response message to the MME.
  • the eNodeB2 sends a UE context update response message or initial UE context establishment to the MME
  • the response message is used to notify the MME that the context update of the UE is successful or successful.
  • the eNodeB2 sends a handover request message to the MME.
  • the eNodeB2 determines to use the packet handover based CSFB or the SRVCC based CSFB to move the UE into the second network according to the UE context update response message or the initial UE context setup response message received in step 510.
  • the eNodeB2 initiates a handover request message to the MME, and adopts CSFB based on packet handover or CSFB based on SRVCC through the corresponding CSFB information.
  • the eNodeB2 may also trigger the UE's CSFB process to move the UE to the second network.
  • the foregoing method step 103 has been described, and details are not described herein again.
  • step 501 may also be after the steps 502-507, and the embodiment of the present invention is not limited thereto.
  • the MME cannot immediately process the circuit domain fallback of the UE, and the MME can record the information that the UE needs to perform circuit domain fallback, for example, MME.
  • the received UE context update message or the initial UE context setup request message may be buffered.
  • the MME may also cache including information not limited to: circuit domain fallback operation state, supported circuit domain fallback indication information, UE context, etc. It should be noted that the embodiments herein are merely examples, and the embodiments of the present invention are not limited thereto.
  • the MME may move the UE to the network supporting the CS service after processing the serving cell handover procedure of the UE. Therefore, the CS service of the UE can be continuously executed, thereby improving the success rate of the CS service establishment.
  • FIG. 6 is a structural diagram of a network device according to another embodiment of the present invention.
  • the network device provided by the embodiment of the present invention may implement the foregoing method embodiment of the present invention.
  • the network device 600 includes:
  • the first determining unit 601 is configured to determine that the serving cell handover process of the UE ends.
  • the second determining unit 602 is configured to determine that the UE needs to be moved to the second network before the first determining unit 601 determines that the serving cell handover process of the UE ends, where the second network is a supporting circuit domain. Business network.
  • the mobile unit 603 is configured to move the UE into the second network according to the result determined by the second determining unit 602.
  • the network device is an access network control device, for example, an eNodeB, where the first network is an LTE network, and the second network is a second generation network or a third generation network, in an embodiment of the present invention, the first determining unit 601
  • the method is specifically configured to determine, according to an access message sent by the UE in the second cell, that the serving cell handover process of the UE ends, where the second cell and the first cell are both cells managed by the network device, where the first cell is a source cell of the UE; in another embodiment of the present invention, the first determining unit 601 is specifically configured to determine, according to the path switch response message sent by the core network device, that the serving cell handover process of the UE ends, where the path switch The response message is sent by the core network device to receive the path switch request message sent by the network device, where the path switch request message indicates that the serving cell of the UE is the second cell, and the second cell is the cell managed by the network device.
  • the second determining unit 602 is specifically configured to determine that the UE context update request message or the initial UE context setup request message sent by the core network device has been received before the first determining unit 601 determines that the serving cell handover process of the UE ends.
  • the UE context update request message or the initial UE context setup request message includes circuit domain fallback indication information, the circuit domain fallback indication information is used to indicate that the UE is moved to the second network, and the second determining unit 602 is configured according to the UE sent by the core network device.
  • the context update request message or the initial UE context setup request message determines that the UE needs to be moved to the second network.
  • the UE context update request message or the initial UE context setup request message further includes an SRCSCC-based eCSFB operation feasible indication information.
  • the UE context update request message or the initial UE context setup request message may further include air interface capability information of the UE.
  • the mobile unit 603 is specifically configured to send a radio resource control connection release message to the UE, by using The corresponding CSFB indication information is used to trigger the UE to be based on the redirected CSFB or the CSFB based on the different system cell change; or the mobile unit 603 is specifically configured to send a handover request message to the core network device, and trigger the UE to be based on the packet by carrying the corresponding CSFB indication information.
  • the network device may further include a response unit 604, configured to send a UE context update response message or an initial UE context setup response message to the core network device.
  • a response unit 604 configured to send a UE context update response message or an initial UE context setup response message to the core network device.
  • the first determining unit 601 is specifically used in an embodiment of the present invention, where the network device is a core network device, such as an MME, where the first network is an LTE network, and the second network is a second-generation network or a third-generation network.
  • the network device is a core network device, such as an MME, where the first network is an LTE network, and the second network is a second-generation network or a third-generation network.
  • the first determining unit 601 determines, according to the location report message, that the serving cell handover process of the UE ends;
  • the second determining unit 602 is specifically configured to determine that the extended service request message of the UE has been received before the first determining unit 601 receives the location report message, and the second determining unit 602 determines that the UE needs to be moved to the second according to the extended service request message.
  • the internet The internet.
  • the first determining unit 601 is specifically configured to receive a bearer update response or a bearer creation response message sent by the serving gateway, where the bearer update response or the bearer creation response message is used by the serving gateway to the network device.
  • a bearer update request or a bearer creation request response message where the bearer update request or the bearer creation request is sent by the network device to the serving gateway when receiving the path switch request message or the handover complete message sent by the access network control device
  • the path switching request message indicates that the serving cell is the second cell
  • the first determining unit 601 determines, according to the bearer update response or the bearer creation response message, that the serving cell handover process of the UE ends.
  • the second determining unit 602 determines that the extended service request message of the UE has been received before the first determining unit 601 receives the bearer update response or the bearer creation response message;
  • the second determining unit 602 determines that the UE needs to be moved to the second network according to the extended service request message.
  • the mobile unit 603 is specifically configured to send a UE context update request message to the access network control device. Or an initial UE context setup request message, where the UE context update request message or the initial UE context setup request message includes circuit domain fallback indication information, used to instruct the access network control device to move the UE to the second network .
  • the network device further includes a third determining unit 605, configured to determine that the UE supports the SRVCC-based eCSFB, and the UE context update request message sent by the mobile unit 603 or the initial UE context setup request message further includes an SRCSCC-based eCSFB. Operational action instructions.
  • the UE context update request message or the initial UE context setup request message further includes air interface capability information of the UE.
  • the third determining unit 605 is configured to determine that the UE supports the SRCSCC-based eCSFB according to the UE's attach request or the tracking area update request message; or the third determining unit 605 acquires the identifier information of the UE, such as the IMEI or the IMSI of the UE, It is determined that the UE supports the SRVCC-based eCSFB according to the identification information of the UE.
  • the first determining unit 601, the second determining unit 602, the moving unit 603, the responding unit 604, and the third determining unit 605 may be implemented by one or more processors.
  • the interaction process between the foregoing units reference may be made to the description in the method embodiments, and details are not described herein again.
  • the UE may move the UE to the CS-enabled network after processing the serving cell handover procedure of the UE. Therefore, the CS service of the UE can be continuously executed, thereby improving the success rate of the CS service establishment.
  • FIG. 7 is a structural diagram of a network device according to another embodiment of the present invention.
  • the network device 700 of this embodiment includes: a bus 701, a processor 702 connected to the bus 701, and a memory 703 connected to the bus 701. .
  • the memory 703 stores a set of program codes, and the memory 703 may include a non-volatile memory.
  • the processor 702 can be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or is configured. One or more integrated circuits implementing embodiments of the present invention.
  • the processor 702 calls the program stored in the memory 703 through the bus 701 for use in
  • the network device is an access network control device, for example, an eNodeB
  • the second network is a WCDMA network or a GSM network
  • the first network is an LTE network.
  • the processor 702 is configured according to the UE sending the access in the second cell.
  • a message such as a handover complete or handover acknowledgment message, determines that the serving cell handover procedure of the UE ends.
  • the target serving cell of the UE is the second cell
  • the second cell is managed by the access network control device
  • the first cell is managed by another access network control device
  • the processor 702 is based on the core.
  • the path switch response message sent by the network device determines that the serving cell handover process of the UE ends, where the path switch response message is sent by the core network device to receive the path switch request message sent by the network device, and the path switch request message indicates The serving cell of the UE is a second cell.
  • the processor 702 determines that the UE context update request message or the initial UE context setup request message sent by the core network device has been received before the end of the serving cell handover procedure of the UE, where the UE context update request message or the initial UE context setup request message includes Circuit domain fallback indication information, the circuit domain fallback indication information is used to indicate that the UE is moved to the second network, and the processor 702 determines that the UE needs to be moved to the second according to the UE context update request message or the initial UE context setup request message.
  • the UE context update request message or the initial UE context setup request message may further include an SRVCC-based eCSFB operation feasible indication information for indicating that the SRVCC-based CSFB can be adopted.
  • the UE is up and down
  • the air interface capability information of the UE may also be included in the text update request message or the initial UE context setup request message.
  • the processor 702 can move the UE to the second network in multiple manners, for example, sending a radio resource control connection release message to the UE, and triggering the UE to be based on the redirected CSFB or the CSFB based on the different system cell change by carrying different CSFB indication information.
  • the handover request message may also be sent to the core network device, and the CSFB based on the packet service handover or the CSFB based on the SRVCC may be triggered by carrying different CSFB indication information.
  • the processor 702 may further send a UE context update response message or an initial UE context setup response message to the core network device before moving the UE to the second network.
  • the network device is a core network device, for example, an MME, and the second network is a WCDMA network or a GSM network, and the first network is an LTE network.
  • the processor 702 can determine that the serving cell handover procedure of the UE ends in a plurality of manners. For example, the processor 702 determines that the serving cell handover procedure of the UE ends according to the location report message sent by the access network control device; and the processor 702 determines that the extended service request message of the UE has been received before receiving the location report message, such that the processor 702 It is determined according to the extended service request message that the UE needs to be moved to the second network.
  • the processor 702 may determine, according to the bearer update response or the bearer creation response message sent by the serving gateway, that the serving cell handover procedure of the UE ends, where the bearer update response or the bearer creation response message is a bearer sent by the serving gateway to the network device.
  • Updating the request or carrying the response message of the creation request, and the bearer update request or the bearer creation request is sent to the serving gateway when the network device receives the path switch request message sent by the access network control device, and the path switch request message indicates the serving cell A second cell; the processor 702 determines that an extended service request message of the UE has been received before receiving the bearer update response or the bearer creation response message, and determines that the UE needs to be moved to the second network according to the extended service request message.
  • the processor 702 is configured to send a UE context update request message or an initial UE context setup request message to the access network control device, in order to move the UE to the second network, where the UE
  • the context update request message or the initial UE context setup request message includes circuit domain fallback indication information for instructing the access network control device to move the UE to the second network.
  • the processor 702 may further determine that the UE supports the enhanced circuit domain fallback eCSFB based on the single wireless voice call continuity SRVCC in multiple manners, thereby in the UE context update request message or
  • the initial UE context setup request message includes an SRVCC-based eCSFB operation feasible indication information.
  • the UE supports the SRVCC-based eCSFB according to the UE's attach request or the tracking area update request message; for example, the processor 702 acquires the identity information of the UE, and determines that the UE supports the SRVCC-based eCSFB according to the identity information of the UE.
  • FIG. 8 is a schematic diagram of networking of a CSFB system 800 according to another embodiment of the present invention. As shown in FIG. 6, the system 800 includes: at least one UE 801 and a network device, where:
  • the network device may be the network device 600 shown in FIG. 6 or the network device 700 shown in FIG. 7. Since the embodiment shown in FIG. 6 and FIG. 7 has been described, the implementation principle and the technical effect are similar. For related descriptions in the foregoing embodiments, reference is made to the related descriptions.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another device, or some features can be ignored or not executed.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, and each unit may exist physically separately, or two or more units may be integrated into one unit.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure.
  • the desired program code and any other medium that can be accessed by the computer may suitably be a computer readable medium.
  • the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media.
  • coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media.
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

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Abstract

本发明实施例公开了电路域回落的方法、网络设备和系统。该方法包括：网络设备确定用户设备UE的服务小区切换过程结束，网络设备确定在所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，其中，所述第二网络为支持电路域业务的网络，网络设备将所述UE移动到所述第二网络中。通过上述方法，当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，网络设备可以在处理完UE的服务小区切换过程后，将UE移动到支持CS业务的网络中，使得UE的CS业务能继续执行，从而提高了CS业务建立的成功率。本发明还公开了电路域回落的网络设备和系统。

Description

电路域回落的方法、网络设备和系统 技术领域
本发明实施例涉及通信领域，尤其涉及电路域回落的方法、网络设备和系统。
背景技术
在目前的通信网络中，第二代(the second generation，2G)网络，例如，全球移动通讯系统(global system of mobile communication，GSM)网络，以及第三代(the third generation，3G)网络，例如，宽带码分多址(wideband code division multiple access，WCDMA)网络已经分别实现了全面覆盖。随着长期演进(long term evolution，LTE)网络技术的发展，LTE网络已开始覆盖话务热点地区，与GSM网络或WCDMA网络并存。
当LTE网络中的用户设备(user equipment，UE)在发起或者进行电路域(circuit switched，CS)业务时，可以从LTE网络回落到2G网络或者3G网络以继续完成CS业务的处理，这一技术也被称为电路域回落(circuit switched fallback，CSFB)，它使得2G网络或者3G网络的网络设备能被重用为LTE网络中的UE提供传统的CS业务。UE可以选择多种方式从LTE网络回落到2G或者3G网络，例如，基于重定向方式，基于PS切换方式，或者基于单一无线语音通话连续性(single radio voice call continuity，SRVCC)切换方式等。
在LTE网络中，UE的服务小区发生切换时，需要UE和网络设备，例如，MME、eNodeB等进行多次信令交互，在现有技术中，如果UE在服务小区切换过程中，又发起语音业务触发网络设备，例如，MME，eNodeB等执行CSFB，网络设备将选择执行服务小区切换过程，导致UE发起的语音业务无法建立成功。
发明内容
有鉴于此，本发明实施例提供了CSFB的方法、网络设备和系统，以实现当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，提高CS业务建立的成功率。
第一方面，本发明实施例提供了一种电路域回落CSFB的方法，所述方法用于第一网络中的网络设备，所述方法包括：
所述网络设备确定用户设备UE的服务小区切换过程结束；
所述网络设备确定在所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，其中，所述第二网络为支持电路域业务的网络；
所述网络设备将所述UE移动到所述第二网络中。
在第一方面的第一种可能的实现方式中，所述UE的源服务小区为第一小区，所述网络设备为接入网控制设备，所述网络设备确定所述UE的服务小区切换过程结束包括：
所述网络设备根据所述UE在第二小区发送的接入消息确定所述UE的服务小区切换过程结束，其中，所述第二小区与所述第一小区均为所述网络设备管理的小区；或者，
所述网络设备根据核心网设备发送的路径切换应答消息确定所述UE的服务小区切换过程结束，其中，所述路径切换应答消息为所述核心网设备接收到所述网络设备发送的路径切换请求消息所发送的，所述路径切换请求消息指示所述UE的服务小区为第二小区。
结合第一方面第一种可能的实现方式，在第二种可能的实现方式中，所述网络设备确定在所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，包括：
所述网络设备确定在所述UE的服务小区切换过程结束之前，已接收到所述核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，所述UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路 域回落指示信息，所述UE上下文更新请求消息或者初始UE上下文建立请求消息用于指示所述网络设备将所述UE移动至所述第二网络；
所述网络设备根据所述核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息确定需要将所述UE移动到第二网络。
结合第一方面第二种可能的实现方式，在第三种可能的实现方式中，所述UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于单一无线语音通话连续性SRVCC的增强电路域回落eCSFB操作可行指示信息。
结合第一方面第二种可能的实现方式以及第三种可能的实现方式中的任意一种可能的实现方式，在第四种可能的实现方式中，所述所述网络设备将所述UE移动到所述第二网络之前，还包括：
所述网络设备向所述核心网设备发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
结合第一方面第一到第四种中任意一种可能的实现方式，在第五种可能的实现方式中，所述网络设备将所述UE移动到所述第二网络中，包括：
所述网络设备向所述UE发送无线资源控制连接释放消息，所述无线资源控制连接释放消息用于触发所述UE基于重定向的CSFB或者基于异系统小区改变的CSFB，或者，
所述网络设备向所述核心网设备发送切换请求消息，所述切换请求消息用于触发所述UE基于分组业务切换的CSFB或者基于SRVCC的eCSFB。
结合第一方面第一到第五种中任意一种可能的实现方式，在第六种可能的实现方式中，所述网络设备为演进基站，所述第一网络为长期演进网络，所述第二网络为第二代网络或者第三代网络。
在第一方面的第七种可能的实现方式中，所述网络设备为核心网设备，所述网络设备确定所述UE的服务小区切换过程结束包括：
所述网络设备根据接入网控制设备发送的位置报告消息确定所述UE的服 务小区切换过程结束，所述位置报告消息是所述接入网控制设备在确定所述UE的位置从第一小区改变为第二小区之后向所述网络设备发送的，所述第一小区与第二小区均为所述接入网控制设备管理的小区；
所述网络设备确定所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，包括：
所述网络设备确定在接收所述位置报告消息之前已接收到所述UE的扩展业务请求消息；
所述网络设备根据所述扩展业务请求消息确定需要将所述UE移动到第二网络。
在第一方面的第八种可能的实现方式中，所述UE的源服务小区为第一小区，所述网络设备为核心网设备，所述网络设备确定UE的服务小区切换过程结束包括：
所述网络设备根据服务网关发送的承载更新响应消息或者承载创建响应消息确定所述UE的服务小区切换过程结束，其中，所述承载更新响应消息或者承载创建响应消息是所述服务网关对所述网络设备所发送的承载更新请求或者承载创建请求的响应消息，所述承载更新请求或者承载创建请求是由所述网络设备接收到接入网控制设备发送的路径切换请求消息或者切换完成消息时向所述服务网关发送的，所述路径切换请求消息或者所述切换完成消息指示服务小区为第二小区；
所述网络设备确定所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，包括：
所述网络设备确定在接收所述承载更新/创建响应消息之前已接收到所述UE的扩展业务请求消息；
所述网络设备根据所述扩展业务请求消息确定需要将所述UE移动到第二网络。
结合第一方面第七种可能的实现方式以及第八种可能的实现方式中的任意 一种可能的实现方式，在第九种可能的实现方式中，所述网络设备将所述UE移动到所述第二网络中，包括：
所述网络设备向所述接入网控制设备发送UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，所述UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，所述上下文更新请求消息或者初始UE上下文建立请求消息用于指示所述接入网控制设备将所述UE移动至所述第二网络。
结合第一方面第九种可能的实现方式，在第十种可能的实现方式中，所述网络设备将所述UE移动到所述第二网络中之前，
所述网络设备确定所述UE支持基于单一无线语音通话连续性SRVCC的增强电路域回落eCSFB；
所述UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于SRVCC的eCSFB操作可行指示信息。
结合第一方面第十种可能的实现方式，在第十一种可能的实现方式中，所述网络设备确定所述UE支持基于SRVCC的eCSFB，包括：
所述网络设备根据所述UE的附着请求或者跟踪区更新请求消息确定所述UE支持基于SRVCC的eCSFB；或者，
所述网络设备获取所述UE的标识信息，所述UE的标识信息至少包括以下一种，国际移动台设备识别码IMEI，国际移动用户识别码IMSI；
所述网络设备根据所述UE的标识信息确定所述UE支持基于SRVCC的eCSFB。。
结合第一方面上述任意一种可能的实现方式，在第十二种可能的实现方式中，所述网络设备为移动性管理实体，所述接入网控制设备为演进基站，所述第二网络为第二代网络或者第三代网络，所述第一网络为长期演进网络。
第二方面，本发明实施例提供了一种网络设备，所述网络设备包括：
第一确定单元，用于确定用户设备UE的服务小区切换过程结束；
第二确定单元，用于在所述第一确定单元确定出所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，其中，所述第二网络为支持电路域业务的网络；
移动单元，用于根据所述第二确定单元确定的结果将所述UE移动到所述第二网络中。
在第二方面的第一种可能的实现方式中，所述UE的源服务小区为第一小区，所述网络设备为接入网控制设备，
所述第一确定单元具体用于根据所述UE在第二小区发送的接入消息确定所述UE的服务小区切换过程结束，所述第二小区与所述第一小区均为所述网络设备管理的小区；或者，
所述第一确定单元具体用于根据核心网设备发送的路径切换应答消息确定所述UE的服务小区切换过程结束，其中，所述路径切换应答消息为所述核心网设备接收到所述网络设备发送的路径切换请求消息所发送的，所述路径切换请求消息指示所述UE的服务小区为第二小区。
结合第二方面第一种可能的实现方式，在第二种可能的实现方式中，所述第二确定单元具体用于确定在所述第一确定单元确定出所述UE的服务小区切换过程结束之前，已接收到核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，所述UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，所述UE上下文更新请求消息或者初始UE上下文建立请求消息用于指示所述网络设备将所述UE移动至所述第二网络；
所述第二确定单元根据所述核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息确定需要将所述UE移动到第二网络。
结合第二方面第二种可能的实现方式，在第三种可能的实现方式中，所述UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于单 一无线语音通话连续性SRVCC的增强电路域回落eCSFB操作可行指示信息。
结合第二方面第一种可能的实现方式以及第二种可能的实现方式中的任意一种可能的实现方式，在第四种可能的实现方式中，所述网络设备还包括：
响应单元，用于向所述核心网设备发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
结合第二方面第一到第四种中任意一种可能的实现方式，在第五种可能的实现方式中，所述移动单元具体用于向所述UE发送无线资源控制连接释放消息，所述无线资源控制连接释放消息用于触发所述UE基于重定向的CSFB或者基于异系统小区改变的CSFB；或者，
所述移动单元具体用于向所述核心网设备发送切换请求消息，所述切换请求消息用于触发所述UE基于分组业务切换的CSFB或者基于SRVCC的CSFB。
结合第二方面第一到第五种中任意一种可能的实现方式，在第六种可能的实现方式中，所述网络设备为演进基站，所述第一网络为长期演进网络，所述第二网络为第二代网络或者第三代网络。
在第二方面的第七种可能的实现方式中，所述网络设备为核心网设备，
所述第一确定单元具体用于接收接入网控制设备发送的位置报告消息，所述第一确定单元根据所述位置报告消息确定所述UE的服务小区切换过程结束,所述位置报告消息是所述接入网控制设备在确定所述UE的位置从第一小区改变为第二小区之后向所述网络设备发送的，所述第一小区与所述第二小区均为所述接入网控制设备管理的小区；
所述第二确定单元具体用于确定在所述第一确定单元接收所述位置报告消息之前已接收到所述UE的扩展业务请求消息，所述第二确定单元根据所述扩展业务请求消息确定需要将所述UE移动到第二网络。
在第二方面的第八种可能的实现方式中，所述UE的源服务小区为第一小区，所述网络设备为核心网设备，
所述第一确定单元具体用于接收服务网关发送的承载更新响应或者承载创 建响应消息，其中，所述承载更新响应或者承载创建响应消息是所述服务网关对所述网络设备所发送的承载更新请求或者承载创建请求的响应消息，所述承载更新请求或者承载创建请求是由所述网络设备接收到接入网控制设备发送的路径切换请求消息或者切换完成消息时向所述服务网关发送的，所述路径切换请求消息或者所述切换完成消息指示服务小区为第二小区，
所述第一确定单元根据所述承载更新响应或者承载创建响应消息确定所述UE的服务小区切换过程结束；
所述第二确定单元确定在所述第一确定单元接收所述承载更新响应或者承载创建响应消息之前已接收到所述UE的扩展业务请求消息；
所述第二确定单元根据所述扩展业务请求消息确定需要将所述UE移动到第二网络。
结合第二方面第七种可能的实现方式以及第八种可能的实现方式中的任意一种可能的实现方式，在第九种可能的实现方式中，所述移动单元具体用于向所述接入网控制设备发送UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，所述UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，所述UE上下文更新请求消息或者初始UE上下文建立请求消息用于指示所述接入网控制设备将所述UE移动至所述第二网络。
结合第二方面第九种可能的实现方式，在第十种可能的实现方式中，所述网络设备还包括第三确定单元，用于确定所述UE支持基于单一无线语音通话连续性SRVCC的增强电路域回落eCSFB；
所述UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于SRVCC的eCSFB操作可行指示信息。
结合第二方面第十种可能的实现方式，在第十一种可能的实现方式中，所述第三确定单元具体用于根据所述UE的附着请求或者跟踪区更新请求消息确定所述UE支持基于SRVCC的eCSFB；或者，
所述第三确定单元获取所述UE的标识信息，所述UE的标识信息至少 包括以下一种，国际移动台设备识别码IMEI，国家移动用户识别码IMSI，所述第三确定单元根据所述UE的标识信息确定所述UE支持基于SRVCC的eCSFB。
结合第二方面上述任意一种实现方式，在第十二种可能的实现方式中，所述网络设备为移动性管理实体，所述接入网控制设备为演进基站，所述第二网络为第二代网络或者第三代网络，所述第一网络为长期演进网络。
第三方面，本发明实施例提供了一种电路域回落的系统，所述系统包括：
至少一个用户设备UE；
第二方面任一种可能实现方式的网络设备。
本发明实施例的方法、设备和系统，当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，可以在处理完UE的服务小区切换过程后将UE移动到支持CS业务的网络中，使得UE的CS业务能继续执行，从而提高了CS业务建立的成功率。
附图说明
图1为本发明一实施例提供的电路域回落的方法的流程图；
图2为本发明另一实施例提供的电路域回落的方法的流程图；
图3为本发明另一实施例提供的电路域回落的方法的流程图；
图4为本发明另一实施例提供的电路域回落的方法的流程图；
图5为本发明另一实施例提供的电路域回落的方法的流程图；
图6为本发明另一实施例提供的网络设备的结构图；
图7为本发明另一实施例提供的网络设备的结构图；
图8为本发明另一实施例提供的电路域回落的系统的组网示意图；
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行 清楚、完整地描述，可以理解的是，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例中方法和装置可以通过网络设备来实现，网络设备包括不限于下述任一种或者多于一种共同实现，接入网控制设备以及核心网设备。这里接入网控制设备可以是演进基站eNodeB，无线网络控制器，或者基站等，核心网设备可以是移动性管理实体MME等。在本发明实施例中，对于网络设备而言，用户和用户设备具有相同的含义。
图1为本发明一实施例提供的电路域回落的方法的流程图，该方法可用于第一网络中的网络设备，如图所示，包括：
101：网络设备确定UE的服务小区切换过程结束。
UE处于连接态时，UE可以在不同小区间进行切换，从而改变服务小区，使得UE的位置发生改变。例如，UE在切换前源服务小区为第一小区，目的服务小区为第二小区，则切换完成后服务小区为第二小区。
在本发明的一个实施例中，网络设备可以为接入网控制设备，例如，eNodeB，该eNodeB管理第二小区。若UE的源服务小区为第一小区，第一小区也为该eNodeB管理，则切换完成后，eNodeB将接收到UE在第二小区发送的接入消息，例如，切换完成消息或者切换确认消息，eNodeB可以确定UE所在的服务小区切换过程结束。若第一小区为另一接入网控制设备管理，且两个eNodeB之间存在X2接口，则eNodeB在接收到UE在第二小区发送的接入消息后，还需要向MME发送路径切换请求消息指示用户面承载切换，eNodeB在接收到MME根据该路径切换请求消息发送的路径切换应答消息后，确定UE所在的服务小区切换过程结束。
在本发明的另一实施例中，网络设备也可以为核心网设备，例如，MME，MME可以通过多种方式确定UE的服务小区切换过程结束。例如，MME接 收到接入网控制设备，例如，eNodeB，发送的位置报告消息，其中位置报告消息中可以指示UE所在的位置标识，例如，小区标识，跟踪区标识等，MME根据接收到的位置报告消息中的UE所在的位置标识可以确定UE的服务小区切换过程结束。举例来说，若UE的源服务小区为第一小区，MME接收到的位置报告消息中指示UE所在的服务小区的小区标识为第二小区，也就是说该位置报告消息是由eNodeB在确定UE的服务小区切换到第二小区之后向MME发送的，这里第一小区和第二小区均为eNodeB管理的小区，则MME可以确定UE所在的服务小区改变过程结束，又例如，若位置报告消息中指示UE所在的跟踪区标识发生了改变，则网络设备可以确定UE的服务小区切换过程结束，需要说明的是，这些都只是举例，本发明实施例并不限于此。为了能及时获取到接入网控制设备发送的UE的位置报告，在本发明的一个实施例中，核心网设备可以向接入网控制设备发送位置订阅消息，订阅UE服务小区改变的信息，从而当UE的服务小区发生改变时，核心网设备将接收到接入网控制设备发送的位置报告消息。
又例如，UE的源服务小区为第一小区，核心网设备接收到服务网关发送的承载更新响应消息或者承载创建响应消息，其中，该承载更新响应消息或者承载创建响应消息是服务网关对核心网设备所发送的承载更新请求或者承载创建请求的响应消息，而该承载更新请求或者承载创建请求消息是由核心网设备接收到接入网控制设备发送的路径切换请求消息或者切换完成消息时向服务网关发送的，其中路径切换请求消息指示服务小区为第二小区，核心网设备可以根据该承载更新响应或者承载创建响应消息确定UE的服务小区切换过程结束。需要说明的是，上述均只是举例，本发明实施例并不以此为限制。
102：网络设备确定在步骤101之前已确定需要将UE移动到第二网络，其中，第二网络为支持电路域业务的网络。
UE在第一网络中发起CS业务时，例如，发起语音业务主叫，或者作为 语音业务的被叫，将向核心网设备发送扩展业务请求消息，并在消息中指示需要进行主叫CSFB或者被叫CSFB业务。核心网设备接收到该扩展业务请求消息后，确定因为CSFB需要将UE移动到支持CS业务的第二网络中，向接入网控制设备发送UE上下文更新消息或者初始UE上下文建立请求消息，其中，UE上下文更新消息或者初始UE上下文建立请求消息中可以包括电路域回落指示信息，用于指示接入网控制设备将UE移动到支持CS业务的第二网络中，也可以进一步包括基于SRVCC的增强电路域回落eCSFB操作可行指示信息用于指示接入网控制设备采用基于SRVCC方式进行CSFB操作，当然，为了便于接入网控制设备确定采用何种方式进行CSFB，UE上下文更新消息或者初始UE上下文建立请求消息中还可以包括UE的空口能力信息。接入网控制设备根据核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息，确定需要将所述UE移动到第二网络。
UE的服务小区发生改变时，需要在核心网设备、接入网控制设备之间进行多次信令交互。UE可以在服务小区切换之前发起CS业务，也可以在服务小区切换的过程中发起CS业务。
以网络设备为接入网控制设备为例，如果在UE的服务小区切换过程结束之前接收到核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，UE上下文更新请求消息或者初始UE上下文建立请求消息中包括电路域回落指示信息，用于指示接入网控制设备将UE移动至支持电路域的第二网络，接入网控制设备确定在步骤101之前已确定需要将UE移动到第二网络。
以网络设备为核心网设备为例，如果在UE的服务小区切换过程结束之前接收到UE的扩展业务请求消息请求建立CS业务，则该核心网设备确定在步骤101之前已确定需要将UE移动到第二网络中。
103：网络设备将UE移动到第二网络中。
网络设备可以通过多种方式将UE移动到第二网络中。
在本发明的一个实施例中，以网络设备为MME为例，MME向接入网控制设备，例如eNodeB发送UE上下文更新请求消息或者初始UE上下文建立请求消息，并在上述消息中包括电路域回落指示信息，eNodeB将根据该电路域回落指示信息将UE移动到第二网络中。进一步地，在步骤103之前，若MME确定UE支持SRVCC切换，则MME还可以在UE上下文更新请求消息或者初始UE上下文建立请求消息中包括基于SRVCC的eCSFB操作可行指示信息，使得eNodeB可以根据该指示信息采用基于SRVCC的CSFB将UE移动到第二网络中。当然，为了便于接入网控制设备确定采用何种方式进行CSFB，UE上下文更新消息或者初始UE上下文建立请求消息中还可以包括UE的空口能力信息。其中，MME可以根据UE的附着请求或者跟踪区更新请求消息确定UE支持SRVCC切换，或者MME也可以获取到UE的标识信息，根据UE的标识信息确定UE支持SRVCC切换，其中UE的标识信息至少包括以下一种：国际移动台设备识别码IMEI和国际移动用户识别码IMSI。需要说明的是，上述均只是举例，本发明实施例并以此为限制。
在本发明的一个实施例中，以网络设备为eNodeB为例，eNodeB可以向UE发送无线资源控制连接释放消息，通过在无线资源控制连接释放消息中携带不同的指示信息CSFB信息触发基于重定向的CSFB或者基于异系统小区改变的CSFB，从而将UE移动到支持CS业务的第二网络中，或者eNodeB也可以向核心网设备，例如，MME，发送切换请求消息，通过在切换请求消息中携带不同的CSFB信息触发基于分组业务切换的CSFB或者基于SRVCC的eCSFB。
在本发明实施例中，第一网络可以是LTE网络，则接入网控制设备为eNodeB，核心网设备为MME，相应地，第二网络可以是GSM网络或者WCDMA网络。需要说明的是，以上仅是举例，本发明实施例并不限于此。
通过本发明实施例的方法，当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，网络设备可以在处理完UE的服务小区切换过 程后将UE移动到支持CS业务的网络中，使得UE的CS业务能继续执行，从而提高了CS业务建立的成功率。
图2为本发明另一实施例提供的电路域回落的方法的流程图，为了方便描述，在本发明实施例中以第一网络为LTE网络，网络设备为eNodeB，第二网络为第3代网络，例如，WCDMA网络为例，可以理解的是，本发明并不限于此。如图所示，包括：
201：UE在第一小区向MME发送扩展业务请求消息。
当UE处于空闲状态并且驻留在第一小区，如果UE需要发起CS业务，例如，UE需要发起语音业务主叫或者UE作为语音业务的被叫，UE将在第一小区经由eNodeB建立连接，并且向MME发送扩展业务请求消息。
当UE已经处于连接态并且源服务小区为eNodeB管理下的第一小区，如果UE需要发起CS业务，例如，UE发起语音业务主叫或者UE作为语音业务的被叫，UE将在第一小区经由eNodeB向MME发送扩展业务请求消息。
202：UE在第一小区向eNodeB发送测量报告消息。
由于UE会持续对第一小区以及第一小区的邻区进行测量，UE将在第一小区向eNodeB发送测量报告消息，该测量报告消息可以包括第一小区的邻区的信号质量信息，例如，该eNodeB管理下的第二小区的信号质量信息。
203：eNodeB向UE发送切换命令消息指示UE切换到第二小区。
eNodeB可以根据步骤202中接收到的测量报告消息判决UE切换到第二小区，例如，第二小区的信号质量高于预设切换门限，又例如，第二小区的信号质量优于第一小区的信号质量，eNodeB判决UE切换到第二小区，向UE发送切换命令消息指示UE切换到第二小区。需要说明的是上述均只是为了方面描述进行举例，本发明实施例并不限于此。
需要说明的是，步骤201也可以在步骤202或步骤203之后，本发明实施例并不以此为限制。
204：eNodeB接收到MME发送的UE上下文更新消息或者初始UE上下文建立请求消息。
MME根据步骤201中接收到的扩展业务请求消息触发CSFB将UE移动到WCDMA网络中。eNodeB将接收到MME发送的UE上下文更新消息或者初始UE上下文建立请求消息，其中，UE上下文更新消息或者初始UE上下文建立请求消息中包括电路域回落指示信息，从而使得eNodeB可以根据该UE上下文更新消息或者初始UE上下文建立请求消息确定需要将UE移动到第二网络。
进一步地，UE上下文更新消息或者初始UE上下文建立请求消息中还可以包括支持基于SRVCC的eCSFB操作可行指示信息，从而eNodeB可以根据支持基于SRVCC的eCSFB操作可行指示信息确定需要采用基于SRVCC切换方式将UE移动到第二网络。当然，UE上下文更新消息或者初始UE上下文建立消息中还可以包括UE的空口能力信息，使得eNodeB可以根据这些信息确定采用合适的方式将UE移动到第二网络。
由于此时eNodeB和UE仍处于切换过程中，eNodeB无法立即处理UE的电路域回落，eNodeB可以将UE需要进行电路域回落的信息进行记录，例如，eNodeB可以缓存接收到的UE上下文更新消息或者初始UE上下文建立请求消息，又例如，eNodeB也可以缓存包括不限于下述信息：电路域回落操作状态，所支持的电路域回落指示信息，UE的上下文等，需要说明的是，此处仅是举例，本发明实施例并不以此为限制。
205：eNodeB接收到UE在第二小区发送的切换完成消息或者切换确认消息。
由于步骤202，203中eNodeB和UE已经处于切换过程中，UE完成服务小区切换后，将在第二小区发送切换完成消息或者切换确认消息，eNodeB根据接收到的UE在第二小区发送的切换完成消息或切换确认消息后，确定UE的服务小区由第一小区改变为第二小区。
206：eNodeB向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
eNodeB根据步骤204中确定需要将UE移动到第二网络，向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息，用于通知MME UE的上下文更新成功或者建立成功。例如，eNodeB在步骤204中接收到MME发送的UE上下文更新消息，则eNodeB可以向MME发送UE上下文更新响应消息，又例如，eNodeB在步骤204中接收到MME发送的初始UE上下文建立请求消息，则eNodeB可以向MME发送初始UE上下文建立响应消息。
需要说明的是，步骤206可以在205之前完成，也可以在步骤205之后完成，本发明实施例并不做限制。在步骤205之后完成时，由于eNodeB已经记录了UE需要进行电路域回落的信息，因此eNodeB可以根据记录的UE需要进行电路域回落的信息向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
207：eNodeB向MME发送切换请求消息。
由于在步骤204中确定了需要将UE移动到第二网络，eNodeB将UE需要进行电路域回落的信息进行记录，从而在步骤205之后，eNodeB根据该信息向MME发起切换请求消息，触发UE基于分组切换的CSFB或者基于SRVCC的CSFB，从而将UE移动到第二网络中。UE移动到第二网络后，将在支持CS业务的第二网络发起并执行CS业务。
当然，在步骤207中，eNodeB也可以采用其他方式触发UE的CSFB流程将UE移动到第二网络中。前述方法步骤103中已经进行过描述，此处不再赘述。
通过本发明实施例的方法，当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，eNodeB可以在处理完UE的服务小区切换过程后，将UE移动到支持CS业务的网络中，使得UE的CS业务能继续执行， 从而提高了CS业务建立的成功率。
图3为本发明另一实施例提供的电路域回落的方法的流程图，为了方便描述，在本发明实施例中仍以第一网络为LTE网络，网络设备为eNodeB1和eNodeB2，第二网络为第3代网络，例如，WCDMA网络为例，可以理解的是，本发明并不限于此。如图所示，包括：
301：eNodeB2接收到UE在第二小区发送的切换完成消息或者切换确认消息。
当UE从eNodeB1管理的第一小区向eNodeB2管理的第二小区切换时，其中eNodeB1和eNodeB2之间存在X2接口，eNodeB1将发起X2接口切换过程。UE完成服务小区切换后，将在eNodeB2管理的第二小区向eNodeB2发送切换完成消息或者切换确认消息。
302：eNodeB2向MME发送路径切换请求消息。
由于X2接口发生切换，因此eNodeB2将向MME发送路径切换请求消息指示切换用户面承载。
303：UE在第二小区向MME发送扩展业务请求消息。
若UE需要发起CS业务，例如，UE发起语音业务主叫或者UE作为语音业务的被叫，UE将在第二小区经由eNodeB2向MME发送扩展业务请求消息。
304：eNodeB2接收到MME发送的UE上下文更新消息或者初始UE上下文建立请求消息。
MME根据步骤303中接收到的扩展业务请求消息触发CSFB将UE移动到WCDMA网络中。eNodeB2将接收到MME发送的UE上下文更新消息或者初始UE上下文建立请求消息，其中，UE上下文更新消息或者初始UE上下文建立请求消息中包括电路域回落指示信息，从而使得eNodeB2可以根据电路域回落指示信息确定需要将UE移动到第二网络。
进一步地，UE上下文更新消息或者初始UE上下文建立请求消息中还可 以包括支持基于SRVCC的eCSFB操作可行指示信息，从而eNodeB2可以根据支持基于SRVCC的eCSFB操作可行指示信息确定需要采用基于SRVCC切换方式将UE移动到第二网络。当然，UE上下文更新消息或者初始UE上下文建立消息中还可以包括UE的空口能力信息，使得eNodeB可以根据这些信息确定采用合适的方式将UE移动到第二网络。
由于此时eNodeB2仍处于切换过程中，eNodeB2无法立即处理UE的电路域回落，eNodeB2可以将UE需要进行电路域回落的信息进行记录，例如，eNodeB2可以缓存接收到的UE上下文更新消息或者初始UE上下文建立请求消息，又例如，eNodeB2也可以缓存包括不限于下述信息：电路域回落操作状态，所支持的电路域回落指示信息，UE的上下文等，需要说明的是，此处仅是举例，本发明实施例并不以此为限制。
305：eNodeB2接收到MME发送的路径切换应答消息。
eNodeB2在接收到MME根据步骤301中的路径切换请求消息所发送的路径切换应答消息后，确定UE所在的服务小区改变过程结束。
306：eNodeB2向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
eNodeB2根据步骤304中确定需要将UE移动到第二网络，向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息，用于通知MME UE的上下文更新成功或者建立成功。例如，eNodeB2在步骤304中接收到MME发送的UE上下文更新消息，则eNodeB2可以向MME发送UE上下文更新响应消息，又例如，eNodeB2在步骤304中接收到MME发送的初始UE上下文建立请求消息，则eNodeB2可以向MME发送初始UE上下文建立响应消息。
需要说明的是，步骤306可以在305之前完成，也可以在步骤305之后完成，本发明实施例并不做限制。在步骤305之后完成时，由于eNodeB2已经记录了UE需要进行电路域回落的信息，因此eNodeB2可以根据记录的 UE需要进行电路域回落的信息向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
307：eNodeB2向UE发送无线控制连接释放消息。
由于在步骤304中确定了需要将UE移动到第二网络，eNodeB2将UE需要进行电路域回落的信息进行记录，从而在步骤305之后，eNodeB2根据该信息向UE发送无线控制连接释放消息，通过在无线资源控制连接释放消息中携带不同的CSFB信息指示采用基于重定向的CSFB或者基于异系统小区改变的CSFB，从而将UE移动到支持CS业务的第二网络中。UE移动到第二网络后，将在支持CS业务的第二网络发起并执行CS业务。
当然，在步骤307中，eNodeB也可以采用其他方式触发UE的CSFB流程将UE移动到第二网络中。前述方法步骤103中已经进行过描述，此处不再赘述。
通过本发明实施例的方法，当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，eNodeB可以在处理完UE的服务小区切换过程后，将UE移动到支持CS业务的网络中，使得UE的CS业务能继续执行，从而提高了CS业务建立的成功率。
图4为本发明另一实施例提供的电路域回落的方法的流程图，为了方便描述，在本发明实施例中仍以第一网络为LTE网络，网络设备为MME，第二网络为第3代网络，例如，WCDMA网络为例，可以理解的是，本发明并不限于此。如图所示，包括：
401：UE在第一小区向MME发送扩展业务请求消息。
402：UE在第一小区向eNodeB发送测量报告消息。
403：eNodeB向UE发送切换命令消息指示UE切换到第二小区。
需要说明的是，步骤401～403也可参见步骤201～203，步骤401也可以在步骤402或步骤403之后，本发明实施例并不以此为限制。
404：MME向eNodeB发送UE上下文更新消息或者初始UE上下文建立请求消息。
MME可以根据步骤401中接收到的扩展业务请求消息触发CSFB将UE移动到WCDMA网络中。MME确定需要将UE移动到WCDMA网络中，将向eNodeB发送UE上下文更新消息或者初始UE上下文建立请求消息，其中，UE上下文更新消息或者初始UE上下文建立请求消息中包括电路域回落指示信息，从而使得eNodeB可以根据电路域回落指示信息确定需要将UE移动到第二网络。
进一步地，MME可以采用多种方式获取UE支持SRVCC切换能力指示信息，从而可以在UE上下文更新消息或者初始UE上下文建立请求消息中包括支持基于SRVCC的eCSFB操作可行指示信息，使得eNodeB可以根据支持基于SRVCC的eCSFB操作可行指示信息确定需要采用基于SRVCC切换方式将UE移动到第二网络。当然，UE上下文更新消息或者初始UE上下文建立消息中还可以包括UE的空口能力信息，使得eNodeB可以根据这些信息确定采用合适的方式将UE移动到第二网络。
例如，UE发送附着请求消息或者跟踪区更新消息时将携带UE支持SRVCC切换能力的指示信息，在本发明的一个实施例中，MME可以根据UE的附着请求消息或者跟踪区更新消息获取该UE支持SRVCC切换能力的指示信息。又例如，可以保存UE的标识信息和支持SRVCC切换能力的对应关系，其中，UE的标识信息至少包括以下一种：UE的国际移动台设备识别码IMEI或者UE的国际移动用户识别码IMSI。MME可以获取UE的标识信息，并根据UE的标识信息获取该UE支持SRVCC切换能力的指示信息。需要说明的是，这里都只是举例说明，本发明并不限于此。
405：MME向eNodeB发送位置报告控制消息。
MME可以向eNodeB发送位置订阅消息订阅UE服务小区改变的信息。例如，MME向eNodeB发送位置报告控制消息，指示eNodeB在UE的服务 小区变为该eNodeB下的另一个小区时上报UE的位置信息。需要说明的是，步骤405并不限于在404之后执行，MME也可以在401之前发送位置报告控制消息，也可以在401～404之间任一时刻发送位置报告控制消息，本发明实施例并不限于此。
406：eNodeB接收到UE在第二小区发送的切换完成消息或者切换确认消息。
407：eNodeB向MME发送位置报告。
由于eNodeB处于切换过程中，eNodeB无法处理步骤404中接收到的UE上下文更新消息或者初始UE上下文建立请求消息。eNodeB在步骤406中确定UE的服务小区为第二小区后，将向MME发送位置报告，并且在位置报告消息中携带UE当前服务小区，也就是第二小区的小区标识。
408：MME向eNodeB发送UE上下文更新消息或者初始UE上下文建立请求消息。
MME接收到eNodeB发送的位置报告消息，由于位置报告消息中指示了UE的服务小区为第二小区，MME确定UE的服务小区已经由第一小区改变为第二小区。进一步地，由于UE的服务小区仍在LTE网络中，MME可以确定步骤404中将UE移动到WCDMA网络的操作并未成功，MME仍需要将UE移动到WCDMA网络中。
MME通过向eNodeB发送UE上下文更新消息或者初始UE上下文建立请求消息将UE移动到WCDMA网络中。这里MME发送UE上下文更新消息或者初始UE上下文建立请求消息可以参见步骤404，此处不再赘述。
409：eNodeB向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
eNodeB向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息，用于通知MME UE的上下文更新成功或者建立成功。
410：eNodeB向MME发送切换请求消息。
eNodeB根据步骤408接收到的UE上下文更新响应消息或者初始UE上下文建立响应消息确定采用基于分组切换的CSFB或者基于SRVCC的CSFB将UE移动到第二网络中。eNodeB向MME发起切换请求消息，通过相应的CSFB信息指示采用基于分组切换的CSFB或者基于SRVCC的CSFB。
当然，在步骤410中，eNodeB也可以采用其他方式触发UE的CSFB流程将UE移动到第二网络中。前述方法步骤103中已经进行过描述，此处不再赘述。
而在步骤402～407之间，由于eNodeB和MME仍在处理UE的服务小区切换过程，MME无法立即处理UE的电路域回落，MME可以将UE需要进行电路域回落的信息进行记录，例如，MME可以缓存接收到的UE上下文更新消息或者初始UE上下文建立请求消息，又例如，MME也可以缓存包括不限于下述信息：电路域回落操作状态，所支持的电路域回落指示信息，UE的上下文等，需要说明的是，此处仅是举例，本发明实施例并不以此为限制。
通过本发明实施例的方法，当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，MME可以在处理完UE的服务小区切换过程后，将UE移动到支持CS业务的网络中，使得UE的CS业务能继续执行，从而提高了CS业务建立的成功率。
图5为本发明另一实施例提供的电路域回落的方法的流程图，为了方便描述，在本发明实施例中仍以第一网络为LTE网络，网络设备为MME，第二网络为第3代网络，例如，WCDMA网络为例，可以理解的是，本发明并不限于此。本发明实施例和图4所示的实施例区别在于，UE的服务小区从eNodeB1管理的第一小区改变为eNodeB2管理的第二小区。由于X2接口发生切换，因此eNodeB2将向MME发送路径切换请求消息指示切换用户面承载。步骤501～504可参见步骤401～404，此处不再赘述。
505：eNodeB2接收到UE在第二小区发送的切换完成消息或者切换确认消息。
506：MME接收到eNodeB2发送的路径切换请求消息指示切换用户面承载。
eNodeB2接收到UE在第二小区发送的切换完成消息或者切换确认消息后，由于发生了X2接口切换，将向MME发送路径切换请求消息。
MME接收到eNodeB2发送的路径切换请求消息指示切换用户面承载，其中路径切换请求消息包括了UE新的位置信息，例如跟踪区标识或者服务小区标识。MME根据路径切换请求消息确定UE的位置正在改变。
507：MME向服务网关发送承载更新请求或者承载创建请求消息。
MME根据步骤506中接收到的路径切换请求消息向服务网关发送承载更新请求或者承载创建请求消息。
508：MME接收到服务网关发送的承载更新响应或者承载创建响应消息。
服务网关根据步骤507接收到的承载更新请求或者承载创建请求消息发送承载更新响应或者承载创建响应消息。MME接收到该承载更新响应或者承载创建响应消息后，确认UE的服务小区切换过程结束。
509：MME向eNodeB2发送路径切换应答消息。
510：MME向eNodeB2发送UE上下文更新消息或者初始UE上下文建立请求消息。
由于UE的服务小区仍在LTE网络中，MME可以确定步骤504中将UE移动到WCDMA网络的操作并未成功，MME仍需要将UE移动到WCDMA网络中。
MME通过向eNodeB2发送UE上下文更新消息或者初始UE上下文建立请求消息将UE移动到WCDMA网络中。这里MME发送UE上下文更新消息或者初始UE上下文建立请求消息可以参见步骤504，此处不再赘述。
511：eNodeB2向MME发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
eNodeB2向MME发送UE上下文更新响应消息或者初始UE上下文建立 响应消息，用于通知MME UE的上下文更新成功或者建立成功。
512：eNodeB2向MME发送切换请求消息。
eNodeB2根据步骤510接收到的UE上下文更新响应消息或者初始UE上下文建立响应消息确定采用基于分组切换的CSFB或者基于SRVCC的CSFB将UE移动到第二网络中。eNodeB2向MME发起切换请求消息，通过相应的CSFB信息采用基于分组切换的CSFB或者基于SRVCC的CSFB。
当然，在步骤512中，eNodeB2也可以采用其他方式触发UE的CSFB流程将UE移动到第二网络中。前述方法步骤103中已经进行过描述，此处不再赘述。
需要说明的是步骤501也可以在步骤502-507之后，本发明实施例并不以此为限制。
而在步骤502～507之间，由于eNodeB和MME仍在处理UE的服务小区切换过程，MME无法立即处理UE的电路域回落，MME可以将UE需要进行电路域回落的信息进行记录，例如，MME可以缓存接收到的UE上下文更新消息或者初始UE上下文建立请求消息，又例如，MME也可以缓存包括不限于下述信息：电路域回落操作状态，所支持的电路域回落指示信息，UE的上下文等，需要说明的是，此处仅是举例，本发明实施例并不以此为限制。
通过本发明实施例的方法，当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，MME可以在处理完UE的服务小区切换过程后，将UE移动到支持CS业务的网络中，使得UE的CS业务能继续执行，从而提高了CS业务建立的成功率。
图6为本发明另一实施例提供的网络设备的结构图，本发明实施例提供的网络设备可以实现本发明上述方法实施例。如图所示，该网络设备600，包括：
第一确定单元601，用于确定UE的的服务小区切换过程结束。
第二确定单元602，用于在第一确定单元601确定出所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，其中，所述第二网络为支持电路域业务的网络。
移动单元603，用于根据第二确定单元602确定的结果，将所述UE移动到所述第二网络中。
其中，网络设备为接入网控制设备，例如eNodeB，第一网络为LTE网络，第二网络为第二代网络或者第三代网络时，在本发明的一个实施例中，第一确定单元601具体用于根据UE在第二小区发送的接入消息确定所述UE的服务小区切换过程结束，所述第二小区与第一小区均为所述网络设备管理的小区，所述第一小区为所述UE的源服务小区；在本发明的另一实施例中，第一确定单元601具体用于根据核心网设备发送的路径切换应答消息确定UE的服务小区切换过程结束，其中，该路径切换应答消息为核心网设备接收到网络设备发送的路径切换请求消息所发送的，该路径切换请求消息指示UE的服务小区为第二小区，第二小区为网络设备管理的小区。
第二确定单元602具体用于在第一确定单元601确定出所述UE的服务小区切换过程结束之前，确定已接收到核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，电路域回落指示信息用于指示将UE移动至所述第二网络；第二确定单元602根据核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息确定需要将UE移动到第二网络。进一步地，UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于SRVCC的eCSFB操作可行指示信息。UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还可以包括UE的空口能力信息。
移动单元603具体用于向UE发送无线资源控制连接释放消息，通过携 带相应的CSFB指示信息触发UE基于重定向的CSFB或者基于异系统小区改变的CSFB；或者，移动单元603具体用于向核心网设备发送切换请求消息，通过携带相应的CSFB指示信息触发UE基于分组业务切换的CSFB或者基于SRVCC的CSFB。
可选地，网络设备还可以包括响应单元604，用于向核心网设备发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
其中，网络设备为核心网设备，例如MME，第一网络为LTE网络，第二网络为第二代网络或者第三代网络时，在本发明的一个实施例中，第一确定单元601具体用于接收接入网控制设备发送的位置报告消息，第一确定单元601根据位置报告消息确定UE的服务小区切换过程结束；
第二确定单元602具体用于确定在所述第一确定单元601接收位置报告消息之前已接收到UE的扩展业务请求消息，第二确定单元602根据扩展业务请求消息确定需要将UE移动到第二网络。
在本发明的另一个实施例中，第一确定单元601具体用于接收服务网关发送的承载更新响应或者承载创建响应消息，其中，该承载更新响应或者承载创建响应消息是服务网关对网络设备所发送的承载更新请求或者承载创建请求的响应消息，该承载更新请求或者承载创建请求是由所述网络设备接收到接入网控制设备发送的路径切换请求消息或者切换完成消息时向服务网关发送的，且路径切换请求消息指示服务小区为第二小区，第一确定单元601根据承载更新响应或者承载创建响应消息确定UE的服务小区切换过程结束。
第二确定单元602确定在第一确定单元601接收承载更新响应或者承载创建响应消息之前已接收到UE的扩展业务请求消息；
第二确定单元602根据扩展业务请求消息确定需要将UE移动到第二网络。
移动单元603具体用于向接入网控制设备发送UE上下文更新请求消息 或者初始UE上下文建立请求消息，其中，UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，用于指示所述接入网控制设备将所述UE移动至所述第二网络。
进一步地，网络设备还包括第三确定单元605，用于确定UE支持基于SRVCC的eCSFB，移动单元603所发送的UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于SRVCC的eCSFB操作可行指示信息。可选地，UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括UE的空口能力信息。其中，第三确定单元605体用于根据UE的附着请求或者跟踪区更新请求消息确定UE支持基于SRVCC的eCSFB；或者，第三确定单元605获取UE的标识信息，例如UE的IMEI或者IMSI等，根据UE的标识信息确定UE支持基于SRVCC的eCSFB。
需要说明的是，本发明实施例中，第一确定单元601、第二确定单元602，移动单元603，响应单元604以及第三确定单元605可以通过一个或多个处理器实现。上述各单元之间的交互流程具体可以参考方法实施例中的描述，这里不再赘述。
通过本发明实施例的网络设备，当UE发起CS业务触发的CSFB和UE的服务小区切换过程发生冲突时，可以在处理完UE的服务小区切换过程后，将UE移动到支持CS业务的网络中，使得UE的CS业务能继续执行，从而提高了CS业务建立的成功率。
图7为本发明另一实施例提供的网络设备的结构图，如图所示，本实施例的网络设备700包括：总线701，与总线701相连的处理器702，与总线701相连的存储器703。其中，存储器703中存储一组程序代码，存储器703可以包括非易失性存储器(Non-volatile Memory)。处理器702可以是一个中央处理器(Central Processing Unit，简称为CPU)，或者是特定集成电路ASIC(Application Specific Integrated Circuit，简称为ASIC)，或者是被配置 成实施本发明实施例的一个或多个集成电路。处理器702通过总线701，调用存储器703中存储的程序，以用于
确定UE的服务小区切换过程结束；确定在所述UE的服务小区切换过程结束之前已确定需要将UE移动到第二网络，其中，所述第二网络为支持电路域业务的网络；将所述UE移动到所述第二网络中。
在本发明的一个实施例中，以网络设备为接入网控制设备，例如，eNodeB，第二网络为WCDMA网络或者GSM网络，第一网络为LTE网络为例。
若UE的源服务小区为第一小区，目的服务小区为第二小区，如果第一小区和第二小区均为同一接入网控制设备管理，处理器702根据UE在第二小区发送的接入消息，例如切换完成或者切换确认消息确定所述UE的服务小区切换过程结束。
若UE的源服务小区为第一小区，目的服务小区为第二小区，如果第二小区为该接入网控制设备管理，第一小区为另一接入网控制设备管理，处理器702根据核心网设备发送的路径切换应答消息确定所述UE的服务小区切换过程结束，其中，该路径切换应答消息为核心网设备接收到网络设备发送的路径切换请求消息所发送的，而路径切换请求消息指示所述UE的服务小区为第二小区。
处理器702确定在UE的服务小区切换过程结束之前，已接收到核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，电路域回落指示信息用于指示将UE移动至所述第二网络，则处理器702根据该UE上下文更新请求消息或者初始UE上下文建立请求消息确定需要将UE移动到第二网络。进一步地，UE上下文更新请求消息或者初始UE上下文建立请求消息中还可以包括基于SRVCC的eCSFB操作可行指示信息用于指示可以采用基于SRVCC方式的CSFB。可选地，UE上下 文更新请求消息或者初始UE上下文建立请求消息中还可以包括UE的空口能力信息。
处理器702可以通过多种方式将UE移动到第二网络中，例如，向UE发送无线资源控制连接释放消息，通过携带不同CSFB指示信息触发UE基于重定向的CSFB或者基于异系统小区改变的CSFB；也可以向核心网设备发送切换请求消息，通过携带不同CSFB指示信息触发UE基于分组业务切换的CSFB或者基于SRVCC的CSFB。
可选地，处理器702在将UE移动到第二网络之前，还可以向核心网设备发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
在本发明的另一实施例中，以网络设备为核心网设备，例如，MME，第二网络为WCDMA网络或者GSM网络，第一网络为LTE网络为例。
处理器702可以通过多种方式确定UE的服务小区切换过程结束。例如，处理器702根据接入网控制设备发送的位置报告消息确定UE的服务小区切换过程结束；并且处理器702确定在接收位置报告消息之前已接收到UE的扩展业务请求消息，从而处理器702根据扩展业务请求消息确定需要将UE移动到第二网络中。
又例如，处理器702可以根据服务网关发送的承载更新响应或者承载创建响应消息确定UE的服务小区切换过程结束，其中，该承载更新响应或者承载创建响应消息是服务网关对网络设备所发送的承载更新请求或者承载创建请求的响应消息，而该承载更新请求或者承载创建请求是由网络设备接收到接入网控制设备发送的路径切换请求消息时向服务网关发送的，路径切换请求消息指示服务小区为第二小区；处理器702确定在接收承载更新响应或者承载创建响应消息之前已接收到UE的扩展业务请求消息，根据扩展业务请求消息确定需要将UE移动到第二网络。
处理器702为了将UE移动到第二网络，具体用于向接入网控制设备发送UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，UE 上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，用于指示接入网控制设备将UE移动至第二网络。进一步地，处理器702将UE移动到第二网络之前，处理器702还可以通过多种方式确定UE支持基于单一无线语音通话连续性SRVCC的增强电路域回落eCSFB，从而在UE上下文更新请求消息或者初始UE上下文建立请求消息中包括基于SRVCC的eCSFB操作可行指示信息。例如，根据UE的附着请求或者跟踪区更新请求消息确定UE支持基于SRVCC的eCSFB；又例如，处理器702获取UE的标识信息，根据UE的标识信息确定UE支持基于SRVCC的eCSFB。
需要说明的是，处理器702通过调用存储器703中存储的程序代码具体实现的技术方案可以参见前述方法实施例，其实现原理和技术效果类似，详细可以参见上述实施例中的相关记载，在此不再赘述。
图8为本发明另一实施例提供的CSFB系统800的组网示意图，如图6所示，该系统800包括：至少一个UE801和网络设备，其中：
网络设备可以为图6所示的网络设备600或者图7所示的网络设备700，由于在图6和图7所示的实施例中，已经进行了说明，其实现原理和技术效果类似，详细可以参见上述实施例中的相关记载，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的设备和方法，可以通过其它的方式实现。例如，以上所描述的设备实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个设备中，或一些特征可以忽略，或不执行。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到本发明可以用硬件实现，或固件实现，或它们的组合方式来实现。当使用软件 实现时，可以将上述功能存储在计算机可读介质中或作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是计算机能够存取的任何可用介质。以此为例但不限于：计算机可读介质可以包括RAM、ROM、EEPROM、CD-ROM或其他光盘存储、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质。此外。任何连接可以适当的成为计算机可读介质。例如，如果软件是使用同轴电缆、光纤光缆、双绞线、数字用户线(DSL)或者诸如红外线、无线电和微波之类的无线技术从网站、服务器或者其他远程源传输的，那么同轴电缆、光纤光缆、双绞线、DSL或者诸如红外线、无线和微波之类的无线技术包括在所属介质的定影中。如本发明所使用的，盘(Disk)和碟(disc)包括压缩光碟(CD)、激光碟、光碟、数字通用光碟(DVD)、软盘和蓝光光碟，其中盘通常磁性的复制数据，而碟则用激光来光学的复制数据。上面的组合也应当包括在计算机可读介质的保护范围之内。
总之，以上所述仅为本发明技术方案的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (27)

  1. 一种电路域回落CSFB的方法，所述方法用于第一网络中的网络设备，其特征在于，所述方法包括：
    所述网络设备确定用户设备UE的服务小区切换过程结束；
    所述网络设备确定在所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，其中，所述第二网络为支持电路域业务的网络；
    所述网络设备将所述UE移动到所述第二网络中。
  2. 根据权利要求1所述的方法，其特征在于，所述UE的源服务小区为第一小区，所述网络设备为接入网控制设备，所述网络设备确定所述UE的服务小区切换过程结束包括：
    所述网络设备根据所述UE在第二小区发送的接入消息确定所述UE的服务小区切换过程结束，其中，所述第二小区与所述第一小区均为所述网络设备管理的小区；或者，
    所述网络设备根据核心网设备发送的路径切换应答消息确定所述UE的服务小区切换过程结束，其中，所述路径切换应答消息为所述核心网设备接收到所述网络设备发送的路径切换请求消息所发送的，所述路径切换请求消息指示所述UE的服务小区为第二小区。
  3. 根据权利要求2所述的方法，其特征在于，所述网络设备确定在所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，包括：
    所述网络设备确定在所述UE的服务小区切换过程结束之前，已接收到所述核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，所述UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，所述UE上下文更新请求消息或者初始UE上下文建立请求消息用于指示所述网络设备将所述UE移动至所述第二网络；
    所述网络设备根据所述核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息确定需要将所述UE移动到第二网络。
  4. 根据权利要求3所述的方法，其特征在于，所述UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于单一无线语音通话连续性SRVCC的增强电路域回落eCSFB操作可行指示信息。
  5. 根据权利要求3或者4所述的方法，其特征在于，所述所述网络设备将所述UE移动到所述第二网络之前，还包括：
    所述网络设备向所述核心网设备发送UE上下文更新响应消息或者初始UE上下文建立响应消息。
  6. 根据权利要求2至5任一项所述的方法，其特征在于，所述网络设备将所述UE移动到所述第二网络中，包括：
    所述网络设备向所述UE发送无线资源控制连接释放消息，所述无线资源控制连接释放消息用于触发所述UE基于重定向的CSFB或者基于异系统小区改变的CSFB，或者，
    所述网络设备向所述核心网设备发送切换请求消息，所述切换请求消息用于触发所述UE基于分组业务切换的CSFB或者基于SRVCC的eCSFB。
  7. 根据权利要求2至6任一项所述的方法，其特征在于，所述网络设备为演进基站，所述第一网络为长期演进网络，所述第二网络为第二代网络或者第三代网络。
  8. 根据权利要求1所述的方法，其特征在于，所述网络设备为核心网设备，所述网络设备确定所述UE的服务小区切换过程结束包括：
    所述网络设备根据接入网控制设备发送的位置报告消息确定所述UE的服务小区切换过程结束，所述位置报告消息是所述接入网控制设备在确定所述UE的位置从第一小区改变为第二小区之后向所述网络设备发送的，所述第一小区与第二小区均为所述接入网控制设备管理的小区；
    所述网络设备确定所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，包括：
    所述网络设备确定在接收所述位置报告消息之前已接收到所述UE的扩展业务请求消息；
    所述网络设备根据所述扩展业务请求消息确定需要将所述UE移动到第二网络。
  9. 根据权利要求1所述的方法，其特征在于，所述UE的源服务小区为第一小区，所述网络设备为核心网设备，所述网络设备确定UE的服务小区切换过程结束包括：
    所述网络设备根据服务网关发送的承载更新响应消息或者承载创建响应消息确定所述UE的服务小区切换过程结束，其中，所述承载更新响应消息或者承载创建响应消息是所述服务网关对所述网络设备所发送的承载更新请求或者承载创建请求的响应消息，所述承载更新请求或者承载创建请求是由所述网络设备接收到接入网控制设备发送的路径切换请求消息或者切换完成消息时向所述服务网关发送的，所述路径切换请求消息或者所述切换完成消息指示服务小区为第二小区；
    所述网络设备确定所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，包括：
    所述网络设备确定在接收所述承载更新/创建响应消息之前已接收到所述UE的扩展业务请求消息；
    所述网络设备根据所述扩展业务请求消息确定需要将所述UE移动到第二网络。
  10. 根据权利要求8或者9所述的方法，其特征在于，所述网络设备将所述UE移动到所述第二网络中，包括：
    所述网络设备向所述接入网控制设备发送UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，所述UE上下文更新请求消息或者初 始UE上下文建立请求消息包括电路域回落指示信息，所述上下文更新请求消息或者初始UE上下文建立请求消息用于指示所述接入网控制设备将所述UE移动至所述第二网络。
  11. 根据权利要求10所述的方法，其特征在于，所述网络设备将所述UE移动到所述第二网络中之前，
    所述网络设备确定所述UE支持基于单一无线语音通话连续性SRVCC的增强电路域回落eCSFB；
    所述UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于SRVCC的eCSFB操作可行指示信息。
  12. 根据权利要求11所述的方法，其特征在于，所述网络设备确定所述UE支持基于SRVCC的eCSFB，包括：
    所述网络设备根据所述UE的附着请求或者跟踪区更新请求消息确定所述UE支持基于SRVCC的eCSFB；或者，
    所述网络设备获取所述UE的标识信息，所述UE的标识信息至少包括以下一种，国际移动台设备识别码IMEI，国际移动用户识别码IMSI；
    所述网络设备根据所述UE的标识信息确定所述UE支持基于SRVCC的eCSFB。
  13. 根据权利要求8至12任一项所述的方法，其特征在于，所述网络设备为移动性管理实体，所述接入网控制设备为演进基站，所述第二网络为第二代网络或者第三代网络，所述第一网络为长期演进网络。
  14. 一种网络设备，其特征在于，所述网络设备包括：
    第一确定单元，用于确定用户设备UE的服务小区切换过程结束；
    第二确定单元，用于在所述第一确定单元确定出所述UE的服务小区切换过程结束之前已确定需要将所述UE移动到第二网络，其中，所述第二网络为支持电路域业务的网络；
    移动单元，用于根据所述第二确定单元确定的结果将所述UE移动到所述第二网络中。
  15. 根据权利要求14所述的网络设备，其特征在于，所述UE的源服务小区为第一小区，所述网络设备为接入网控制设备，
    所述第一确定单元具体用于根据所述UE在第二小区发送的接入消息确定所述UE的服务小区切换过程结束，所述第二小区与所述第一小区均为所述网络设备管理的小区；或者，
    所述第一确定单元具体用于根据核心网设备发送的路径切换应答消息确定所述UE的服务小区切换过程结束，其中，所述路径切换应答消息为所述核心网设备接收到所述网络设备发送的路径切换请求消息所发送的，所述路径切换请求消息指示所述UE的服务小区为第二小区。
  16. 根据权利要求15所述的网络设备，其特征在于，所述第二确定单元具体用于确定在所述第一确定单元确定出所述UE的服务小区切换过程结束之前，已接收到核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，所述UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，所述UE上下文更新请求消息或者初始UE上下文建立请求消息用于指示所述网络设备将所述UE移动至所述第二网络；
    所述第二确定单元根据所述核心网设备发送的UE上下文更新请求消息或者初始UE上下文建立请求消息确定需要将所述UE移动到第二网络。
  17. 根据权利要求16所述的网络设备，其特征在于，所述UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于单一无线语音通话连续性SRVCC的增强电路域回落eCSFB操作可行指示信息。
  18. 根据权利要求15或16所述的网络设备，其特征在于，所述网络设备还包括：
    响应单元，用于向所述核心网设备发送UE上下文更新响应消息或者初 始UE上下文建立响应消息。
  19. 根据权利要求15至18任一项所述的网络设备，其特征在于，所述移动单元具体用于向所述UE发送无线资源控制连接释放消息，所述无线资源控制连接释放消息用于触发所述UE基于重定向的CSFB或者基于异系统小区改变的CSFB；或者，
    所述移动单元具体用于向所述核心网设备发送切换请求消息，所述切换请求消息用于触发所述UE基于分组业务切换的CSFB或者基于SRVCC的eCSFB。
  20. 根据权利要求15至19任一项所述的网络设备，其特征在于，所述网络设备为演进基站，所述第一网络为长期演进网络，所述第二网络为第二代网络或者第三代网络。
  21. 根据权利要求14所述的网络设备，其特征在于，所述网络设备为核心网设备，
    所述第一确定单元具体用于接收接入网控制设备发送的位置报告消息，所述第一确定单元根据所述位置报告消息确定所述UE的服务小区切换过程结束,所述位置报告消息是所述接入网控制设备在确定所述UE的位置从第一小区改变为第二小区之后向所述网络设备发送的，所述第一小区与所述第二小区均为所述接入网控制设备管理的小区；
    所述第二确定单元具体用于确定在所述第一确定单元接收所述位置报告消息之前已接收到所述UE的扩展业务请求消息，所述第二确定单元根据所述扩展业务请求消息确定需要将所述UE移动到第二网络。
  22. 根据权利要求14所述的网络设备，其特征在于，所述UE的源服务小区为第一小区，所述网络设备为核心网设备，
    所述第一确定单元具体用于接收服务网关发送的承载更新响应或者承载创建响应消息，其中，所述承载更新响应或者承载创建响应消息是所述服务网关对所述网络设备所发送的承载更新请求或者承载创建请求的响应消 息，所述承载更新请求或者承载创建请求是由所述网络设备接收到接入网控制设备发送的路径切换请求消息或者切换完成消息时向所述服务网关发送的，所述路径切换请求消息或者所述切换完成消息指示服务小区为第二小区，
    所述第一确定单元根据所述承载更新响应或者承载创建响应消息确定所述UE的服务小区切换过程结束；
    所述第二确定单元确定在所述第一确定单元接收所述承载更新响应或者承载创建响应消息之前已接收到所述UE的扩展业务请求消息；
    所述第二确定单元根据所述扩展业务请求消息确定需要将所述UE移动到第二网络。
  23. 根据权利要求21或者22所述的网络设备，其特征在于，所述移动单元具体用于向所述接入网控制设备发送UE上下文更新请求消息或者初始UE上下文建立请求消息，其中，所述UE上下文更新请求消息或者初始UE上下文建立请求消息包括电路域回落指示信息，所述UE上下文更新请求消息或者初始UE上下文建立请求消息用于指示所述接入网控制设备将所述UE移动至所述第二网络。
  24. 根据权利要求23所述的网络设备，其特征在于，所述网络设备还包括第三确定单元，用于确定所述UE支持基于单一无线语音通话连续性SRVCC的增强电路域回落eCSFB；
    所述UE上下文更新请求消息或者所述初始UE上下文建立请求消息中还包括基于SRVCC的eCSFB操作可行指示信息。
  25. 根据权利要求24所述的网络设备，其特征在于，所述第三确定单元具体用于根据所述UE的附着请求或者跟踪区更新请求消息确定所述UE支持基于SRVCC的eCSFB；或者，
    所述第三确定单元获取所述UE的标识信息，所述UE的标识信息至少包括以下一种，国际移动台设备识别码IMEI，国家移动用户识别码IMSI， 所述第三确定单元根据所述UE的标识信息确定所述UE支持基于SRVCC的eCSFB。
  26. 根据权利要求21至25任一项所述的网络设备，其特征在于，所述网络设备为移动性管理实体，所述接入网控制设备为演进基站，所述第二网络为第二代网络或者第三代网络，所述第一网络为长期演进网络。
  27. 一种电路域回落的系统，其特征在于，所述系统包括：
    至少一个用户设备UE；
    如权利要求14至26任一项所述的网络设备。
PCT/CN2015/078247 2015-05-05 2015-05-05 电路域回落的方法、网络设备和系统 Ceased WO2016176816A1 (zh)

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