WO2016106562A1 - 一种电路域回落的方法、设备及*** - Google Patents

一种电路域回落的方法、设备及*** Download PDF

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Publication number
WO2016106562A1
WO2016106562A1 PCT/CN2014/095589 CN2014095589W WO2016106562A1 WO 2016106562 A1 WO2016106562 A1 WO 2016106562A1 CN 2014095589 W CN2014095589 W CN 2014095589W WO 2016106562 A1 WO2016106562 A1 WO 2016106562A1
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Prior art keywords
domain
network
message
request
mme
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PCT/CN2014/095589
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English (en)
French (fr)
Inventor
吴晓波
崇卫微
席国宝
Original Assignee
华为技术有限公司
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Priority to CN201480083783.2A priority Critical patent/CN107005895A/zh
Priority to PCT/CN2014/095589 priority patent/WO2016106562A1/zh
Publication of WO2016106562A1 publication Critical patent/WO2016106562A1/zh

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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]

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for circuit domain fallback.
  • Second Generation (Second Generation, 2G) or Third Generation (3G) networks such as Global System of Mobile Communication (GSM) or Wideband Code Division Multiple Access (WCDMA) Basic coverage has been basically achieved.
  • GSM Global System of Mobile Communication
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • LTE networks have covered some urban areas and traffic hotspots, so that in current communication networks, LTE networks coexist with 2G or 3G networks.
  • some LTE networks may only support data services and do not support voice services.
  • UE User Equipment
  • the 2G or 3G network in the (Circuit Switched, CS) domain performs voice services on the 2G or 3G network with the CS domain.
  • circuit domain fallback The above technology of switching from the CS domain of the LTE network to the CS domain of the 2G or 3G network is called circuit domain fallback.
  • CSFB Circuit Switched Fallback
  • VoIP Voice over LTE
  • the UE may use Voice over LTE (VoLTE) services, however, due to LTE networks The full coverage is not achieved. If the UE that is using VoLTE is in the border area of the LTE network and the 2G or 3G network or is about to enter the area that covers only the 2G or 3G network, it is usually necessary to switch the VoLTE to the CS domain of the 2G or 3G network. To avoid voice interruptions.
  • the user equipment after the user equipment performs the redirection-based CSFB from the LTE network, it returns to the 2G or 3G network to initiate a voice call. If the 2G or 3G network is congested, the voice service cannot be established, causing the call to fail, and the UE returns to the LTE. The internet. The UE may initiate the CSFB to fall back to the 2G or 3G network again or automatically reselect the 2G or 3G network to initiate the voice service. If the 2G or 3G network is still congested, the call will fail again and return to the LTE network, thus generating a ping-pong effect.
  • This not only causes unnecessary signaling processes in the LTE network and the 2G or 3G network, but also increases the load on the network and affects the services of the user equipment, resulting in poor user experience. For example, in the above process, the user may not be able to perform voice. Call, still can't get online.
  • the embodiment of the present invention provides a method for circuit domain fallback, which can terminate the circuit domain fallback in the case of 2G or 3G network congestion in the process of implementing CSFB, and avoid unnecessary signaling flow. Reduce the load on the network and improve the user experience.
  • an embodiment of the present invention provides a method for circuit domain fallback, including:
  • the mobility management entity MME receives a request message sent by the user equipment of the long term evolution LTE network, where the request message is used to request the circuit domain to fall back;
  • the MME determines that the CS domain of the 2G or 3G network has no available resources
  • the MME Sending, by the MME, a request rejection message to the user equipment, where the request rejection message includes a cause value indicating that the CS domain is unavailable, and a value of a timer, where the request rejection message is used to indicate that the user equipment receives the The request rejection message begins, and the circuit domain cannot be requested to fall back until the time corresponding to the value of the timer arrives.
  • the MME determines the 2G or 3G
  • the QoS of the CS domain of the network includes: the MME sends a handover request message to the mobile switching center MSC, where the handover request message is used to request the MSC to switch the user equipment from the LTE network to the 2G or 3G.
  • Circuit-switched CS domain of the network to perform circuit domain fallback the MME receives a handover response message returned by the MSC according to the handover request message, where the handover response message includes a CS domain indicating that the 2G or 3G network does not The indication information of the available resources; the MME determines, according to the handover response message, that the CS domain of the 2G or 3G network has no available resources.
  • the method before the MME determines that the CS domain of the 2G or 3G network has no available resources, the method is The MME further includes: sending, by the MME, a notification message to the eNodeB eNodeB according to the service request message, where the notification message is used to instruct the eNodeB to move the user equipment from the LTE network to a CS domain of a 2G or 3G network.
  • the MME receives the handover request message returned by the eNodeB according to the notification message, and the handover request message is used to trigger the CS domain handover process of the LTE network to the 2G or 3G network.
  • the method further includes:
  • an embodiment of the present invention provides a method for circuit domain fallback, the method comprising:
  • the evolved base station eNodeB located in the Long Term Evolution (LTE) network receives the notification message sent by the mobility management entity MME, and the notification message is used to instruct the eNodeB to move the user equipment from the LTE network to the second generation 2G or third generation 3G network.
  • the handover request response message is The MME sends in the case that it is determined that the circuit switched CS domain of the 2G or 3G network has no available resources;
  • the eNodeB terminates the circuit domain fallback according to the termination indication.
  • an embodiment of the present invention provides a method for circuit domain fallback, where the method includes:
  • the user equipment of the LTE-based LTE network sends a request message to the mobility management entity MME, where the request message is used to request the circuit domain to fall back;
  • the request rejection message includes a cause value indicating that the CS domain is unavailable, and a value of a timer, the request rejection message is used to indicate that the user equipment starts from receiving the request rejection message, and corresponds to a value of the timer. The time of the circuit cannot be requested to fall back before the time is reached;
  • the user equipment does not request the circuit domain to fall back from the receipt of the request rejection message until the time corresponding to the value of the timer arrives.
  • an embodiment of the present invention provides a method for circuit domain fallback, where the method includes: a mobility management entity MME receives a paging message sent by a mobile switching center MSC, where the paging message is used to request the MME Initiating a circuit domain fallback for user equipment located in the Long Term Evolution (LTE) network;
  • LTE Long Term Evolution
  • the MME determines that the CS domain of the 2G or 3G network has no available resources
  • the MME does not send a circuit domain fallback paging message to the user equipment, to prevent the user equipment from selecting a 2G or 3G network for voice service after receiving the circuit domain fallback paging message.
  • the MME determines the 2G or 3G No resources available for the CS domain of the network include:
  • the MME Sending, by the MME, a handover request message to the mobile switching center MSC, where the handover request message is used to request the MSC to switch the user equipment from the LTE network to a circuit switched CS domain of the 2G or 3G network to perform a circuit.
  • the MME receives the handover response message returned by the MSC according to the handover request message, where the handover response message includes indication information indicating that the CS domain of the 2G or 3G network has no available resources; the MME According to the handover response message, it is determined that the CS domain of the 2G or 3G network has no available resources.
  • the method is Also includes:
  • the MME sending, by the MME, a notification message to the eNodeB eNodeB according to the service request message, where the notification message is used to instruct the eNodeB to move the user equipment from the LTE network to a CS domain of a 2G or 3G network to perform a circuit.
  • the MME receives the handover request message returned by the eNodeB according to the notification message, and the handover request message is used to trigger a CS domain handover procedure of the LTE network to the 2G or 3G network.
  • the method further includes: The MME sends a handover request response message to the eNodeB, where the handover request response message carries a termination indication, and the termination indication is used to instruct the eNodeb to terminate the circuit domain fallback.
  • the method before the MME sends the notification message to the eNodeB, the method further includes: The MME sends a packet domain paging message to the user equipment in an idle state; the MME receives a service request message sent by the user equipment.
  • an embodiment of the present invention provides a mobility management entity, including:
  • a receiving unit configured to receive a request message sent by a user equipment that is located in a long term evolution LTE network, where the request message is used to request a circuit domain to fall back;
  • a determining unit configured to determine that the CS domain of the 2G or 3G network has no available resources during the circuit switched CS domain handover preparation process of the LTE network to the second generation 2G or the third generation 3G network;
  • a sending unit configured to send a request rejection message to the user equipment, where the request rejection message includes a cause value indicating that the CS domain is unavailable, and a value of a timer, where the request rejection message is used to indicate that the user equipment receives the The request rejection message begins, and the circuit domain cannot be requested to fall back until the time corresponding to the value of the timer arrives.
  • the sending unit is further configured to send a handover request message to the mobile switching center MSC, where the handover request message is used to request the MSC to take the user equipment from the The LTE network switches to a circuit switched CS domain of the 2G or 3G network to perform circuit domain fallback;
  • the receiving unit is further configured to receive a handover response message that is returned by the MSC according to the handover request message, where the handover response message includes indication information indicating that the CS domain of the 2G or 3G network has no available resources;
  • the determining unit is specifically configured to determine, according to the handover response message, that the CS domain of the 2G or 3G network has no available resources.
  • the sending unit is further configured to determine, in the determining unit, a CS domain of the 2G or 3G network Before the available resources, the notification message is sent to the evolved base station eNodeB, where the notification message is used to instruct the eNodeB to move the user equipment from the LTE network to the CS domain of the 2G or 3G network for circuit domain fallback;
  • the receiving unit is further configured to receive a handover request message that is returned by the eNodeB according to the notification message, where the handover request message is used to trigger a CS domain handover procedure of the LTE network to the 2G or 3G network.
  • the sending unit is further configured to: after the determining unit determines that the CS domain of the 2G or 3G network has no available resources, Sending a handover request response message to the eNodeB, where the handover request response message carries a termination indication, the termination indication is used to instruct the eNodeb to terminate the circuit domain fallback.
  • an evolved base station including:
  • a receiving unit configured to receive a notification message sent by the mobility management entity MME, where the notification message is used to indicate that the evolved base station moves the user equipment from the long term evolution LTE network to the circuit switching of the second generation 2G or third generation 3G network.
  • the notification message is used to indicate that the evolved base station moves the user equipment from the long term evolution LTE network to the circuit switching of the second generation 2G or third generation 3G network.
  • a sending unit configured to send a handover request message to the MME, to trigger a CS domain handover process of the LTE network to the 2G or 3G network;
  • the receiving unit is further configured to receive a handover request response message sent by the MME, where the handover request response message carries a termination indication, where the termination indication is used to instruct the eNodeb to terminate the circuit domain fallback; the handover request response The message is that the MME sends if it is determined that the circuit switched CS domain of the 2G or 3G network has no available resources;
  • a terminating unit configured to terminate the circuit domain fallback according to the termination indication.
  • the seventh aspect of the present invention provides a user equipment, including:
  • a sending unit configured to send a request message to the mobility management entity MME, where the request message is used to request that the circuit domain fall back;
  • a receiving unit configured to receive a request rejection message returned by the MME, where the request rejection message is sent by the MME in determining that the circuit switched CS domain of the second generation 2G or third generation 3G network has no available resources,
  • the request rejection message includes a cause value indicating that the CS domain is unavailable, and a value of a timer, the request rejection message is used to indicate that the user equipment starts from receiving the request rejection message, to a value of the timer.
  • the circuit domain cannot be requested to fall back before the corresponding duration arrives;
  • the processing unit is configured to start from the receipt of the request rejection message, and does not request the circuit domain to fall back until the time corresponding to the value of the timer arrives.
  • an embodiment of the present invention provides a mobility management entity, including:
  • a receiving unit configured to receive a paging message sent by the mobile switching center MSC, where the paging message is used to request the mobility management entity to initiate a circuit domain fallback for a user equipment located in a long term evolution LTE network;
  • a determining unit configured to determine that the CS domain of the 2G or 3G network has no available resources during the circuit switched CS domain handover preparation process of the LTE network to the second generation 2G or the third generation 3G network;
  • a processing unit configured to: after the determining unit determines that the CS domain of the 2G or 3G network has no available resources, send a circuit domain fallback paging message to the user equipment, to prevent the user equipment from receiving the After the circuit domain falls back to the paging message, the 2G or 3G network is selected for voice service.
  • the mobility management entity further includes: a first sending unit, configured to send a handover request message to the mobile switching center MSC, where the handover request message is used to request the MSC to switch the user equipment from the LTE network to the 2G or Circuit-switched CS domain of 3G network to perform circuit domain fallback;
  • the receiving unit is further configured to receive a handover response message that is returned by the MSC according to the handover request message, where the handover response message includes indication information indicating that the CS domain of the 2G or 3G network has no available resources;
  • the determining unit is specifically configured to determine, according to the handover response message, that the CS domain of the 2G or 3G network has no available resources.
  • the mobility management entity further includes:
  • a second sending unit configured to send, to the evolved base station eNodeB, a notification message, before the determining unit determines that the CS domain of the 2G or 3G network has no available resources, where the notification message is used to instruct the eNodeB to use the user equipment Moving from the LTE network to a CS domain of a 2G or 3G network for circuit domain fallback;
  • the receiving unit is further configured to receive a handover request message that is returned by the eNodeB according to the notification message, where the handover request message is used to trigger a CS domain handover procedure of the LTE network to the 2G or 3G network.
  • the second sending unit is further configured to determine, in the determining unit, that the CS domain of the 2G or 3G network has no available resources. Then, a handover request response message is sent to the eNodeB, where the handover request response message carries a termination indication, and the termination indication is used to instruct the eNodeb to terminate the circuit domain fallback.
  • the second sending unit is further configured to: before being sent to the eNodeB The user equipment in the idle state sends a packet domain paging message; the receiving unit is further configured to receive a service request message sent by the user equipment.
  • an embodiment of the present invention provides a mobility management entity, including a bus, and a processor, a memory, a transmitter, and a receiver connected to the bus;
  • the memory is for storing computer execution instructions, the computer execution instructions being configured to be executed by the processor;
  • the receiver is configured to receive a request message sent by a user equipment located in a long term evolution LTE network, where The request message is used to request that the circuit domain fall back;
  • the processor is configured to determine that the CS domain of the 2G or 3G network has no available resources during the circuit switched CS domain handover preparation process of the LTE network to the second generation 2G or the third generation 3G network;
  • the sender is configured to send a request rejection message to the user equipment, where the request rejection message includes a cause value indicating that the CS domain is unavailable, and a value of a timer, where the request rejection message is used to indicate that the user equipment is Upon receiving the request rejection message, the circuit domain cannot be requested to fall back until the time corresponding to the value of the timer arrives.
  • the specific implementation of the transmitter in the embodiment of the present invention may refer to the sending unit in any one of the possible implementation manners in the fifth aspect or the fifth aspect.
  • the specific implementation of the receiver in the embodiment of the present invention may be referred to.
  • the receiving unit according to any one of the possible implementations of the fifth aspect or the fifth aspect, the specific implementation of the processor in the embodiment of the present invention may refer to the fifth aspect or the fifth aspect, any one of the possible implementation manners. Determine the unit.
  • an embodiment of the present invention provides an evolved base station, including a bus, and a processor, a memory, a transmitter, and a receiver connected to the bus;
  • the memory is for storing computer execution instructions, the computer execution instructions being configured to be executed by the processor;
  • the receiver is configured to receive a notification message sent by the mobility management entity MME, where the notification message is used to indicate that the evolved base station moves the user equipment from the long term evolution LTE network to the circuit switching of the second generation 2G or third generation 3G network.
  • the transmitter is configured to send a handover request message to the MME to trigger a CS domain handover procedure of the LTE network to the 2G or 3G network;
  • the receiver is further configured to receive a handover request response message sent by the MME, where the handover request response message carries a termination indication, where the termination indication is used to instruct the eNodeb to terminate the circuit domain fallback; the handover request response The message is that the MME sends if it is determined that the circuit switched CS domain of the 2G or 3G network has no available resources;
  • the processor is configured to terminate the circuit domain fallback according to the termination indication.
  • an embodiment of the present invention provides a user equipment, including a bus, and a processor, a memory, a transmitter, and a receiver connected to the bus;
  • the memory is for storing computer execution instructions, the computer execution instructions being configured to be executed by the processor;
  • the sender is configured to send a request message to the mobility management entity MME, where the request message is used to request that the circuit domain fall back;
  • the receiver is configured to receive a request rejection message returned by the MME, where the request rejection message is sent by the MME if it is determined that the circuit switched CS domain of the second generation 2G or third generation 3G network has no available resources.
  • the request rejection message includes a cause value indicating that the CS domain is unavailable, and a value of a timer, the request rejection message is used to indicate that the user equipment starts from receiving the request rejection message, to the timer The circuit domain cannot be requested to fall back before the time corresponding to the value arrives;
  • the processor is configured to not request the circuit domain to fall back before receiving the request rejection message until the time corresponding to the value of the timer arrives.
  • an embodiment of the present invention provides a mobility management entity, including a bus, and a processor, a memory, a transmitter, and a receiver connected to the bus;
  • the memory is for storing computer execution instructions, the computer execution instructions being configured to be executed by the processor;
  • the receiver is configured to receive a paging message sent by the mobile switching center MSC, where the paging message is used to request the mobility management entity to initiate a circuit domain fallback of a user equipment located in a long term evolution LTE network;
  • the processor is configured to determine, during the circuit-switched CS domain handover preparation process of the LTE network to the second-generation 2G or the third-generation 3G network, that the CS domain of the 2G or 3G network has no available resources, where the determining unit is After determining that the CS domain of the 2G or 3G network has no available resources, sending a circuit domain fallback paging message to the user equipment, to prevent the user equipment from selecting 2G after receiving the circuit domain fallback paging message or The 3G network performs voice services.
  • the specific implementation of the transmitter in the embodiment of the present invention may refer to the first sending unit and the second sending unit according to any one of the possible implementations of the eighth aspect or the eighth aspect, where
  • the receiving unit may refer to any of the possible implementations of the eighth aspect or the eighth aspect.
  • the specific implementation of the processor in the embodiment of the present invention may refer to any one of the eighth aspect or the eighth aspect. Possible implementations are the determining unit and the processing unit.
  • the embodiment of the present invention provides a system for circuit domain fallback, comprising the mobility management entity according to any of the possible implementations of the fifth aspect or the fifth aspect, and the sixth aspect or the An evolved base station as described in any of the possible implementations of the six aspects.
  • the system further includes a seventh aspect Or the user equipment of any one of the possible implementation manners of the seventh aspect.
  • the embodiment of the present invention provides a system for circuit domain fallback, comprising the mobility management entity according to any of the possible implementations of the fifth aspect or the fifth aspect, and the seventh aspect or the The user equipment described in any of the possible implementations of the seven aspects.
  • the system further includes the evolved base station according to any one of the possible implementations of the sixth aspect or the sixth aspect.
  • the embodiment of the present invention provides a system for circuit domain fallback, comprising the mobility management entity according to any of the possible implementations of the eighth aspect or the eighth aspect, and the sixth aspect or the An evolved base station as described in any of the possible implementations of the six aspects.
  • the mobility management entity may learn the CS domain congestion of the 2G or 3G network before the user equipment accesses the CS domain of the 2G or 3G network, and determine the 2G or 3G network.
  • the CS domain has no available resources
  • the termination circuit domain is dropped, and the user equipment is prevented from accessing the 2G or 3G network when the CS domain of the 2G or 3G network is congested, thereby reducing unnecessary LTE networks and 2G.
  • the signaling process of the 3G network avoids the signaling impact on the LTE network and the 2G or 3G network, reduces the load on the network, and improves the user experience.
  • FIG. 1 is a flowchart of a method for circuit domain fallback according to an embodiment of the present invention
  • FIG. 3 is a flowchart of still another method for circuit domain fallback according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a mobility management entity according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of an evolved base station according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of a user equipment according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of still another mobility management entity according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of an apparatus for circuit domain fallback according to an embodiment of the present invention.
  • the embodiment of the invention provides a circuit domain fallback method.
  • the LTE network can know the congestion of the CS domain network of the 2G or 3G network in advance, terminate the circuit domain fallback call flow, and avoid unnecessary LTE.
  • the signaling flow of the network and the 2G or 3G network avoids the signaling impact on the LTE network and the 2G or 3G network, reduces the load on the network, and improves the user experience.
  • the embodiments of the present invention also provide corresponding devices and systems. The details are described below separately.
  • an embodiment of the present invention provides a method for circuit domain fallback.
  • a User Equipment (UE) located in an LTE network as a calling party requests a CSFB from a Mobile Management Entity (MME) of the LTE network.
  • MME Mobile Management Entity
  • the MME receives a request message sent by a user equipment located in an LTE network, where the request message is used to request CSFB.
  • S102 During the CS domain handover preparation process of the LTE network to the 2G or 3G network, the MME determines that the CS domain of the 2G or 3G network has no available resources.
  • the user equipment needs to be handed over from the LTE network to the CS domain of the 2G or 3G network, so that the MME can be in the circuit of the LTE network to the second generation 2G or the third generation 3G network.
  • the CS domain handover preparation process that is, before the user equipment accesses the CS domain of the 2G or 3G network, it is determined whether the CS domain of the 2G or 3G network has available resources, and if no resources are available, the 2G is indicated. Or the CS domain of the 3G network may be congested.
  • the MME sends a request rejection message to the user equipment, where the request rejection message includes a cause value indicating that the CS domain is unavailable, and a value of a timer, where the request rejection message is used to indicate that the user equipment receives the The request rejection message begins, and the CSFB cannot be requested until the time corresponding to the value of the timer arrives.
  • the MME sends a request rejection message to the user equipment, rejecting the current CSFB, thereby terminating the CSFB. Further, since the user equipment may reselect to the 2G or 3G network to initiate the voice flow after waiting for a period of time, the request rejection message may include a cause value indicating that the CS domain is unavailable and a value of the timer, so that the user equipment From the receipt of the request rejection message, the CSFB is not requested until the time corresponding to the value of the timer arrives.
  • the MME may access the CS of the 2G or 3G network in the user equipment.
  • the CS domain congestion condition of the 2G or 3G network is known, and the CS domain of the 2G or 3G network is determined to have available resources.
  • the user equipment sends a request rejection message, thereby rejecting this CSFB.
  • the request rejection message further includes a cause value indicating that the CS domain is unavailable and a value of the timer, so that the user equipment starts from receiving the request rejection message, and before the time corresponding to the value of the timer arrives
  • the CSFB cannot be requested, so that the user equipment is prevented from accessing the 2G or 3G network when the CS domain of the 2G or 3G network is congested, and the CS domain of the user equipment in the 2G or 3G network is also avoided.
  • CSFB is again requested to fall back to the 2G or 3G network, which reduces the signaling impact on the LTE network and the 2G/3G network and improves the user experience.
  • an embodiment of the present invention provides a method of CSFB.
  • the Mobile Services Switching Centre may request the MME to initiate CSFB (ie, initiate a CSFB call), and the user equipment located in the LTE network may serve as a called party.
  • the method is as follows.
  • the MME receives a paging message sent by the MSC, where the paging message is used to request the MME to initiate a CSFB to the user equipment.
  • S202 During the CS domain handover preparation process of the LTE network to the 2G or 3G network, the MME determines that the CS domain of the 2G or 3G network has no available resources.
  • the user equipment When CSFB is performed, the user equipment needs to be handed over from the LTE network to a CS domain of a 2G or 3G network, so that the MME can perform circuit switching on the LTE network to a second generation 2G or third generation 3G network.
  • the CS domain handover preparation process that is, before the user equipment accesses the CS domain of the 2G or 3G network, it is determined whether the CS domain of the 2G or 3G network has available resources, and if no resources are available, the 2G or The CS domain of the 3G network may be congested.
  • S203 The MME does not send a CSFB paging message to the user equipment, so as to prevent the user equipment from selecting a 2G or 3G network to perform voice service after receiving the CSFB paging message.
  • the MME After determining that the CS domain of the 2G or 3G network has no available resources, the MME does not send a CSFB paging message to the user equipment, so that the user equipment does not receive the CSFB paging request, which not only avoids the user equipment being If the CS domain of the 2G or 3G network is congested, the 2G or 3G network is connected to the voice service, and the user equipment is prevented from selecting 2G again if the CS domain of the 2G or 3G network is congested.
  • the 3G network performs voice services, which reduces the signaling impact on the LTE network and the 2G/3G network and improves the user experience.
  • the MME may indicate that an evolved base station (eNodeB) of the LTE network moves the user equipment from the LTE network to a CS domain of a 2G or 3G network to perform CSFB.
  • eNodeB evolved base station
  • the eNodeB triggers the CS domain handover of the LTE network to the 2G or 3G network
  • it is determined whether the CS domain of the 2G or 3G network has available resources, and the method further includes: the MME according to the request message Sending a notification message to the evolved base station eNodeB, the notification message is used to instruct the eNodeB to move the user equipment from the LTE network to a CS domain of a 2G or 3G network for CSFB;
  • the MME receives the eNodeB according to the eNodeB
  • the handover request message returned by the notification message, where the handover request message is used to trigger a CS domain handover procedure of the LTE network to the 2G or 3G network.
  • the MME may send a handover request response message to the eNodeB, where the handover request response message carries a termination indication, and the termination The indication is for instructing the eNodeb to terminate the CSFB.
  • CSFB may continue to be performed to switch the user equipment from the LTE network to the 2G or 3G network.
  • the MME may further send a handover request response message including the termination indication to the eNodeB, so that the eNodeB terminates the CSFB according to the termination indication, that is, does not use the user equipment from the LTE network.
  • FIGS. 3 and 4 a specific embodiment of the method of CSFB according to the present invention is provided below with reference to FIGS. 3 and 4.
  • the specific implementations of FIGS. 1 and 2 can be referred to the following embodiments.
  • an embodiment of the present invention provides a method for circuit domain call.
  • S301 The UE sends a request message to the MME, where the request message is used to request CSFB.
  • the request message may be an extended service request.
  • the MME may determine whether the LTE network and the 2G or 3G network support switching the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB.
  • the MME may also not judge, but by default, the communication network supports switching the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB, or only to some of the communication networks. Judging, wherein the communication network The network is the LTE network or the 2G or 3G network.
  • the MME sends a notification message to the eNodeB according to the extended service request, where the notification message is used to instruct the eNodeB to move the UE from an LTE network to a CS domain of a 2G or 3G network to perform CSFB. That is, the notification message is used to instruct the eNodeB to move the UE from the LTE network to the 2G or 3G network in order to perform the CSFB.
  • the MME may notify the eNodeB of the LTE network and the 2G or 3G by sending a notification message. Whether the network supports handover of the UE from the LTE network to a CS domain of a 2G or 3G network for the CSFB to enable the eNodeB to initiate handover of the UE from the LTE network to a CS domain of a 2G or 3G network Claim.
  • S303 The eNodeB sends a handover request message to the MME.
  • the handover request message is used to indicate that the UE is switched from the LTE network to the CS domain of the 2G or 3G network, that is, the CS domain handover process that can be used to trigger the LTE network to the 2G or 3G network.
  • the handover request message may be a CS domain handover request message from the LTE network to the 2G or 3G network, such as an LTE to 2G or 3G SRVCC HO Required message, or from the LTE network to the 2G Or PS domain and CS domain handover request messages of the 3G network (for example: LTE to 2G or 3G SRVCC and PS HO Required messages).
  • the MME sends a first handover request message to an MSC in the 2G or 3G network, where the first handover request message is used to request the MSC to switch the UE from the LTE network to the 2G or Circuit switched CS domain of 3G networks.
  • the MSC sends a second handover request message to the base station, where the second handover request message is used to request the base station to allocate a CS domain resource to the CS domain of the 2G or 3G network.
  • the base station in the embodiment of the present invention includes a base station controller (BSC) or a radio network controller (RNC).
  • BSC base station controller
  • RNC radio network controller
  • the base station sends a second handover request response message to the MSC, where the second handover request response message carries indication information indicating that the CS domain of the 2G or 3G network has no available resources.
  • the base station may carry the second handover request response message for indicating the 2G or 3G network.
  • the CS domain has no indication of available resources to notify the MSC, the 2G or 3G
  • the CS domain of the network cannot allocate CS domain resources.
  • the MSC sends a first handover response message to the MME, where the first handover response message includes indication information indicating that the CS domain of the 2G or 3G network has no available resources.
  • the MSC may send a first handover response message to the MME in response to the first handover request message, because the first handover response message includes For indicating that the CS domain of the 2G or 3G network has no available resources, the first handover response message may also include indication information indicating that the CS domain of the 2G or 3G network has no available resources.
  • the first handover response message sent by the MSC to the MME may also include indication information for indicating that the CS domain of the 2G or 3G network has no available resources.
  • the MME sends a handover request response message to the eNodeB, where the handover request response message carries a termination indication, where the termination indication is used to instruct the eNodeb to terminate the CSFB.
  • the MME may terminate the CSFB by transmitting a termination indication to the eNodeB upon receiving a first handover response message including indication information for indicating that the CS domain of the 2G or 3G network has no available resources. To prevent the eNodeB from continuing to execute this CSFB process.
  • the handover request response message may further include indication information for indicating that the 2G or 3G network has no available resources.
  • the eNodeB after receiving the handover request response message, the eNodeB does not transfer the UE from the LTE network to the 2G or 3G network, thereby terminating the CSFB, thereby preventing the user equipment from being in the
  • the CS domain of the 2G or 3G network is congested, access to the 2G or 3G network reduces the signaling impact on the LTE network and the 2G/3G network, and improves the user experience.
  • the MME sends a request rejection message to the UE, where the request rejection message includes a cause value and a timer value, the cause value is a CS domain unavailable, and the request rejection message is used to indicate the user equipment. From the receipt of the request rejection message, CSFB cannot be requested until the time corresponding to the value of the timer arrives.
  • the request rejection message may be a Service Reject message, and the reason value included in the service rejection message is CS service temporarily unavailable, and the value of the timer included in the service rejection message is timed.
  • the UE After receiving the service rejection message, the UE starts a timer T3442, where the timeout period of the timer T3442 is the value of T3442 included in the service rejection message, and the UE does not wait before the timer T3442 times out. Try to initiate a CSFB service.
  • the user equipment is not only allowed to access the 2G or 3G network when the CS domain of the 2G or 3G network is congested, but also the user equipment is prevented from being congested in the CS domain of the 2G or 3G network. Requesting CSFB to fall back to the 2G or 2G network again, reducing the signaling impact on the LTE network and the 2G/3G network, and improving the user experience.
  • the user equipment is used as the calling party.
  • the circuit domain switching method described in FIG. 4 may be referred to.
  • S403-S409 in the embodiment of the present invention reference may be made to S303-S309, and details are not described herein again.
  • the MSC sends a paging message to the MME to request to initiate a CSFB call procedure to the user equipment.
  • the paging message may specifically be a CS paging request.
  • the MME sends a notification message to the eNodeB eNodeB according to the paging message, where the notification message is used to instruct the eNodeB to move the user equipment from the LTE network to a CS domain of a 2G or 3G network. Perform CSFB.
  • the MME may send a packet domain paging message to the user equipment in an idle state, thereby changing the user equipment from an idle state to a connected state.
  • the user equipment may send a service request message to the MME.
  • S403 The eNodeB sends a handover request message to the MME.
  • the MME sends a first handover request message to an MSC in the 2G or 3G network, where the first handover request message is used to request the MSC to switch the UE from the LTE network to the 2G or Circuit switched CS domain of 3G networks.
  • the MSC sends a second handover request message to the base station, where the second handover request message is used to request the base station to allocate a CS domain resource to the CS domain of the 2G or 3G network.
  • the base station sends a second handover request response message to the MSC, where the second handover request response message carries indication information indicating that the CS domain of the 2G or 3G network has no available resources.
  • the MSC sends a first handover response message to the MME, where the first handover response message includes indication information indicating that the CS domain of the 2G or 3G network has no available resources.
  • S408 The MME sends a handover request response message to the eNodeB to terminate the CSFB.
  • the handover request response message carries a termination indication, and the termination indication is used to instruct the eNodeb to terminate the CSFB.
  • S409 The eNodeB terminates the CSFB.
  • the eNodeB after receiving the handover request response message, the eNodeB does not transfer the UE from the LTE network to the 2G or 3G network, thereby terminating the CSFB.
  • S410 The MME does not send a CSFB paging message to the user equipment.
  • the MME after receiving the paging message, the MME sends a CSFN paging message to the user equipment.
  • the MME determines that the CS domain of the 2G or 3G network has no available resources, the MME does not The user equipment sends a CSFB paging message to prevent the user equipment from automatically selecting a 2G or 3G network for voice service after receiving the CSFB paging message, thereby avoiding selecting a 2G or 3G network for voice service.
  • the LTE network is returned to the LTE network, which reduces the signaling impact on the LTE network and the 2G/3G network and improves the user experience.
  • the embodiment of the present invention provides a mobility management entity 50, as shown in FIG. 5, comprising: a receiving unit 501, a determining unit 502, and a sending unit 503;
  • the receiving unit 501 is configured to receive a request message sent by a user equipment located in an LTE network, where the request message is used to request a CSFB;
  • the determining unit 502 is configured to determine that the CS domain of the 2G or 3G network has no available resources during the CS domain handover preparation process of the LTE network to the 2G or 3G network.
  • the sending unit 503 is configured to send a request rejection message to the user equipment, where the request rejection message includes a cause value indicating that the CS domain is unavailable, and a value of a timer, where the request rejection message is used to indicate the user equipment From the receipt of the request rejection message, CSFB cannot be requested until the time corresponding to the value of the timer arrives.
  • the sending unit 503 may perform the mobile switching.
  • the central MSC sends a handover request message, the handover request message is used to request the
  • the MSC switches the user equipment from the LTE network to a circuit switched CS domain of the 2G or 3G network to perform CSFB;
  • the receiving unit 501 receives a handover response message returned by the MSC according to the handover request message,
  • the handover response message includes indication information indicating that the CS domain of the 2G or 3G network has no available resources; then the determining unit 502 may determine, according to the handover response message, that the CS domain of the 2G or 3G network is unavailable. Resources.
  • the sending unit 503 is further configured to: before the determining unit 502 determines that the CS domain of the 2G or 3G network has no available resources, send a notification message to the evolved base station eNodeB, where the notification message is used to indicate the The eNodeB moves the user equipment from the LTE network to a CS domain of a 2G or 3G network to perform CSFB; the receiving unit 501 is further configured to receive a handover request message returned by the eNodeB according to the notification message, where the handover is performed.
  • the request message is used to trigger a CS domain handover procedure of the LTE network to the 2G or 3G network. Therefore, after receiving the handover request message, the MME may determine whether the CS domain of the 2G or 3G network has available resources.
  • the sending unit 503 may further send a handover request response message to the eNodeB, where the handover request response message carries a termination indication.
  • the termination indication is used to instruct the eNodeb to terminate the CSFB.
  • the determining unit 502 may know the congestion of the CS domain of the 2G or 3G network and determine the 2G or 3G network before the user equipment accesses the CS domain of the 2G or 3G network. If the CS domain has available resources, the sending unit 503 may send a request rejection message to the user equipment when the determining unit 502 determines that the CS domain of the 2G or 3G network has no available resources, thereby rejecting the CSFB. .
  • the request rejection message further includes a cause value indicating that the CS domain is unavailable and a value of the timer, so that the user equipment starts from receiving the request rejection message, and before the time corresponding to the value of the timer arrives
  • the CSFB cannot be requested, so that the user equipment is prevented from accessing the 2G or 3G network when the CS domain of the 2G or 3G network is congested, and the CS domain of the user equipment in the 2G or 3G network is also avoided.
  • CSFB is again requested to fall back to the 2G or 3G network, which reduces the signaling impact on the LTE network and the 2G/3G network and improves the user experience.
  • the embodiment of the present invention provides an evolved base station, as shown in FIG. 6, comprising: a receiving unit 601, a sending unit 602, and a terminating unit 603;
  • the receiving unit 601 is configured to receive a notification message sent by the MME, where the notification message is used to instruct the evolved base station to move the user equipment from the long term evolution LTE network to the circuit switched CS domain of the second generation 2G or third generation 3G network.
  • the notification message is used to instruct the evolved base station to move the user equipment from the long term evolution LTE network to the circuit switched CS domain of the second generation 2G or third generation 3G network.
  • CSFB For CSFB;
  • the sending unit 602 is configured to send a handover request message to the MME, to trigger a CS domain handover process of the LTE network to the 2G or 3G network;
  • the receiving unit 601 is further configured to receive a handover request response message sent by the MME, where the handover request response message carries a termination indication, where the termination indication is used to instruct the eNodeb to terminate the CSFB; the handover request response message
  • the MME is sent if it is determined that the circuit switched CS domain of the 2G or 3G network has no available resources;
  • the terminating unit 603 is configured to terminate the CSFB according to the termination indication.
  • the method embodiments of any one of the embodiments of the present invention are not described herein.
  • the MME may send a handover request response message including the termination indication to the eNodeB, so that the eNodeB can be used according to the Terminating the termination of the CSFB, that is, not switching the user equipment from the LTE network to the CS domain of the 2G or 3G network, thereby preventing the user equipment from being congested in the CS domain of the 2G or 3G network.
  • the ping-pong effect generated after accessing the 2G or 3G network reduces the signaling impact on the LTE network and the 2G/3G network, and improves the user experience.
  • the embodiment of the present invention provides a user equipment 70, as shown in FIG. 7, comprising: a sending unit 701, a receiving unit 702, and a processing unit 703;
  • the sending unit 701 is configured to send a request message to the MME, where the request message is used to request CSFB;
  • the receiving unit 702 is configured to receive a request rejection message returned by the MME, where the request rejection message is sent by the MME when determining that the CS domain of the 2G or 3G network has no available resources, the request rejection message Included with a value indicating a reason value and a timer that is unavailable for the CS domain, the request rejection message is used to indicate that the user equipment 70 starts from receiving the request rejection message, to the The CSFB cannot be requested until the time corresponding to the value of the timer arrives;
  • the processing unit 703 is configured to start from the receipt of the request rejection message, and not request CSFB until the time corresponding to the value of the timer arrives. Therefore, the user equipment 70 is prevented from requesting the CSFB to fall back to the 2G or 3G network again when the CS domain of the 2G or 3G network is congested, which reduces the signaling impact on the LTE network and the 2G/3G network, and improves the user. Experience.
  • the embodiment of the present invention provides a mobility management entity 80, as shown in FIG. 8, including a receiving unit 801, a determining unit 802, and a processing unit 803:
  • the receiving unit 801 is configured to send, by the MSC, a paging message, where the paging message is used to request the mobility management entity to initiate a CSFB to a user equipment located in an LTE network.
  • the determining unit 802 is configured to determine that the CS domain of the 2G or 3G network has no available resources during the CS domain handover preparation process of the LTE network to the 2G or 3G network.
  • the processing unit 803 is configured to: after the determining unit 802 determines that the CS domain of the 2G or 3G network has no available resources, does not send a CSFB paging message to the user equipment, to prevent the user equipment from receiving The CSFB paging message is followed by a 2G or 3G network for voice service.
  • the mobility management entity further includes the first a sending unit, configured to send a handover request message to the mobile switching center MSC, where the handover request message is used to request the MSC to switch the user equipment from the LTE network to a circuit switched CS domain of the 2G or 3G network.
  • the receiving unit 801 is further configured to receive a handover response message that is returned by the MSC according to the handover request message, where the handover response message includes, to indicate that the CS domain of the 2G or 3G network has no available resources.
  • the determining unit 802 is specifically configured to determine, according to the handover response message, that the CS domain of the 2G or 3G network has no available resources.
  • the mobility management entity further includes: a second sending unit 805, configured to send a notification message to the evolved base station eNodeB before the determining unit 802 determines that the CS domain of the 2G or 3G network has no available resources,
  • the notification message is used to instruct the eNodeB to use the user equipment from The LTE network moves to the CS domain of the 2G or 3G network to perform CSFB;
  • the receiving unit 801 is further configured to receive a handover request message that is returned by the eNodeB according to the notification message, where the handover request message is used to trigger the The CS domain handover procedure of the LTE network to the 2G or 3G network, so that the MME may determine whether the CS domain of the 2G or 3G network has available resources after receiving the handover request message.
  • the second sending unit 805 is further configured to: after the determining unit 802 determines that the CS domain of the 2G or 3G network has no available resources, send a handover request response message to the eNodeB, where the handover request response The message carries a termination indication, the termination indication being used to instruct the eNodeb to terminate the CSFB.
  • the second sending unit 805 may further send a packet domain paging message to the user equipment in an idle state before sending the notification message to the eNodeB.
  • the receiving unit 801 can also receive a service request message sent by the user equipment.
  • the processing unit 803 does not send a CSFB paging message to the user equipment, so that the user equipment does not receive
  • the access to the CSFB paging request not only prevents the user equipment from accessing the 2G or 3G network for voice service when the CS domain of the 2G or 3G network is congested, but also avoids the user equipment being in the 2G
  • the 2G or 3G network is selected again for voice services, which reduces the signaling impact on the LTE network and the 2G/3G network, and improves the user experience.
  • a unit for transmitting a message such as a sending unit 503, a sending unit 602, a sending unit 701, a first sending unit 804, or a second sending unit 805, It can be implemented by a transmitter or by a transceiver; a unit for receiving a message, such as a receiving unit 501, a receiving unit 601, a receiving 702 or a receiving unit 801, can be implemented by a receiver or by using a transceiver.
  • the transmitter or receiver or transceiver can be implemented by one physical entity or multiple physical entities.
  • the transmitter, receiver, and transceiver can be implemented by one physical entity or multiple physical entities.
  • determining unit 502 can be implemented using one or more processors.
  • the above transmitter, receiver, transceiver and processor can be connected by a bus.
  • the embodiment of the present invention further provides an apparatus for circuit domain fallback, and the apparatus may include:
  • the processor 901, the memory 902, the receiver 905, and the transmitter 906 are connected by a bus 904 and complete communication with each other.
  • Processor 901 may be a single core or multi-core central processing unit, or a particular integrated circuit, or one or more integrated circuits configured to implement embodiments of the present invention.
  • the memory 902 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the memory 902 is used to store computer execution instructions 903.
  • the computer execution instructions 903 may include program code.
  • the processor 901 runs the computer execution instruction 903, and can execute the method flow of the circuit domain fallback described in the method embodiment corresponding to any one of FIG. 1 to FIG.
  • the device may be a mobility management entity, an evolved base station, or a user equipment.
  • the device may be a mobility management entity or an evolved base station.
  • the embodiment of the present invention provides a computer readable medium, including a computer executing instruction, when the processor of the computer executes the computer execution instruction, the computer performs the method embodiment corresponding to any one of FIG. 1 to FIG.
  • the embodiment of the present invention further provides a system for circuit domain fallback, including a mobility management entity 50 and an evolved base station 60; optionally, a user equipment 70; a mobility management entity 50, an evolved base station 60, and a user
  • a system for circuit domain fallback including a mobility management entity 50 and an evolved base station 60; optionally, a user equipment 70; a mobility management entity 50, an evolved base station 60, and a user
  • the embodiment of the present invention further provides a system for circuit domain fallback, including a mobility management entity 50 and a user equipment 70; optionally, an evolved base station 60; a mobility management entity 50, an evolved base station 60, and a user
  • a system for circuit domain fallback including a mobility management entity 50 and a user equipment 70; optionally, an evolved base station 60; a mobility management entity 50, an evolved base station 60, and a user
  • the embodiment of the present invention further provides a system for circuit domain fallback, including a mobility management entity 80 and an evolved base station 60; optionally, a user equipment; a mobility management entity 80, an evolved base station 60, and a user equipment
  • a system for circuit domain fallback including a mobility management entity 80 and an evolved base station 60; optionally, a user equipment; a mobility management entity 80, an evolved base station 60, and a user equipment
  • the LTE network mentioned in the present invention includes an LTE A network, and may subsequently have an LTE version.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
  • the disclosed systems, devices, and methods 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 system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

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Abstract

本发明公开了一种电路域回落的方法，MME可以在所述用户设备接入到2G或3G网络的CS域之前，获知所述2G或3G网络的CS域拥塞情况，在确定所述2G或3G网络的CS域没有可用资源时，终止电路域回落，避免所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入所述2G或3G网络，减少了不必要的LTE网络和2G或3G网络的信令流程，避免对LTE网络和2G或3G网络的信令冲击，减轻了网络的负荷，提升了用户体验。

Description

一种电路域回落的方法、设备及*** 技术领域
本发明涉及通信技术领域，具体涉及一种电路域回落的方法、设备及***。
背景技术
全球移动通讯***(Global System of Mobile Communication，GSM)或者宽带码分多址(Wideband Code Division Multiple Access，WCDMA)等第二代(Second Generation，2G)或者第三代网络(Third Generation，3G)网络已经基本实现了全面覆盖。
随着长期演进(Long Term Evolution，LTE)网络技术的发展，这些LTE网络已覆盖到一些城区和话务热点地区，这样在目前的通信网络中，LTE网络与2G或3G网络并存。由于LTE网络正在建设阶段，有的LTE网络可能只支持数据业务，不支持语音业务，当处于LTE网络中的用户设备(User Equipment,UE)发起语音业务时，UE需要先回退到具有电路交换(Circuit Switched，CS)域的2G或3G网络，在具有CS域的2G或3G网络进行语音业务，上述从LTE网络的CS域切换至2G或3G网络的CS域的技术，称为电路域回落(Circuit Switched Fallback，CSFB)技术，或者称为电路交换域回落技术；而有的LTE网络可能支持语音业务，则UE可以使用基于LTE的语音(Voice over LTE，VoLTE)业务，然而，由于LTE网络并没有实现全面覆盖，正在使用VoLTE的UE如果处于LTE网络和2G或3G网络的边界区域或即将进入只覆盖了2G或3G网络的区域，通常需要将VoLTE切换到2G或3G网络的CS域，来避免语音中断。
现有技术中，用户设备从LTE网络执行基于重定向的CSFB后，回落到2G或3G网络发起语音呼叫，此时如果2G或3G网络拥塞，将无法建立语音业务，导致呼叫失败，UE返回LTE网络。UE可能会再次发起CSFB回落到2G或3G网络或者会自动重选到2G或3G网络发起语音业务，如果2G或3G网络仍然拥塞，将再次导致呼叫失败，返回LTE网络，从而产生了乒乓效应。这不仅导致了不必要的LTE网络和2G或3G网络频繁的信令流程，加重了网络的负荷，还会影响用户设备的业务，导致用户体验差，例如在上述过程中用户可能不仅无法进行语音通话，还无法上网。
发明内容
针对现有技术的上述问题，本发明实施例提供一种电路域回落的方法，能够在实现CSFB过程中，在2G或3G网络拥塞的情况下终止电路域回落，避免不必要的信令流程，减轻了网络的负荷，提升了用户体验。
第一方面，本发明实施例提供了一种电路域回落的方法，包括：
移动性管理实体MME接收位于长期演进LTE网络的用户设备发送的请求消息，所述请求消息用于请求电路域回落；
在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源；
所述MME向所述用户设备发送请求拒绝消息，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落。
结合第一方面，在第一种可能的实现方式中，在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源包括：所述MME向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行电路域回落；所述MME接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；所述MME根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
结合第一方面，或者第一方面的第一种可能的实现方式，在第二种可能的实现方式中，在所述MME确定所述2G或3G网络的CS域没有可用资源之前，所述方法还包括：所述MME根据所述业务请求消息，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行电路域回落；所述MME接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
结合第一方面的第二种可能的实现方式，在第三种可能的实现方式中，在所述MME确定所述2G或3G网络的CS域没有可用资源之后，所述方法还包括：
所述MME向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落。
第二方面，本发明实施例提供了一种电路域回落的方法，该方法包括：
位于长期演进LTE网络的演进基站eNodeB接收移动性管理实体MME发送的通知消息，所述通知消息用于指示所述eNodeB将用户设备从所述LTE网络移动到第二代2G或第三代3G网络的电路交换CS域以进行电路域回落；
所述eNodeB向所述MME发送切换要求消息，以触发所述LTE网络到所述2G或3G网络的CS域切换过程；
所述eNodeB接收所述MME发送的切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落；所述切换要求响应消息是所述MME在确定所述2G或3G网络的电路交换CS域没有可用资源的情况下发送的；
所述eNodeB根据所述终止指示，终止所述电路域回落。
第三方面，本发明实施例提供了一种电路域回落的方法，其特征在于，所述方法包括：
位于长期演进LTE网络的用户设备向移动性管理实体MME发送请求消息，所述请求消息用于请求电路域回落；
所述用户设备接收所述MME返回的请求拒绝消息，所述请求拒绝消息是所述MME在确定第二代2G或第三代3G网络的电路交换CS域没有可用资源的情况下发送的，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落；
所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不请求电路域回落。
第四方面，本发明实施例提供了一种电路域回落的方法，所述方法包括：移动性管理实体MME接收移动交换中心MSC发送的寻呼消息，所述寻呼消息用于请求所述MME对位于长期演进LTE网络的用户设备发起电路域回落；
在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过 程中，所述MME确定所述2G或3G网络的CS域没有可用资源；
所述MME不向所述用户设备发送电路域回落寻呼消息，以避免所述用户设备在接收到所述电路域回落寻呼消息之后选择2G或者3G网络进行语音业务。
结合第四方面，在第一种可能的实现方式中，在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源包括：
所述MME向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行电路域回落；所述MME接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；所述MME根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
结合第四方面，或者第四方面的第一种可能的实现方式，在第二种可能的实现方式中，在所述MME确定所述2G或3G网络的CS域没有可用资源之前，所述方法还包括：
所述MME根据所述业务请求消息，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行电路域回落；所述MME接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
结合第四方面的第二种可能的实现方式，在第三种可能的实现方式中，在所述MME确定所述2G或3G网络的CS域没有可用资源之后，所述方法还包括：所述MME向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落。
结合第四方面的第二种或第三种可能的实现方式，在第四种可能的实现方式中，在所述MME向所述eNodeB发送所述通知消息之前，所述方法还包括：所述MME向处于空闲状态的所述用户设备发送分组域寻呼消息；所述MME接收所述用户设备发送的业务请求消息。
第五方面，本发明实施例提供了一种移动性管理实体，包括：
接收单元，用于接收位于长期演进LTE网络的用户设备发送的请求消息，所述请求消息用于请求电路域回落；
确定单元，用于在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源；
发送单元，用于向所述用户设备发送请求拒绝消息，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落。
结合第五方面，在第一种可能的实现方式中，所述发送单元还用于向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行电路域回落；
所述接收单元还用于接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；
所述确定单元具体用于根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
结合第五方面，或者第五方面的第一种可能的实现方式，在第二种可能的实现方式中，所述发送单元还用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源之前，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行电路域回落；
所述接收单元还用于接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
结合第五方面的第二种可能的实现方式，在第三种可能的实现方式中，所述发送单元还用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源之后，向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落。
第六方面，本发明实施例提供了一种演进基站，包括：
接收单元，用于接收移动性管理实体MME发送的通知消息，所述通知消息用于指示所述演进基站将用户设备从长期演进LTE网络移动到第二代2G或第三代3G网络的电路交换CS域以进行电路域回落；
发送单元，用于向所述MME发送切换要求消息，以触发所述LTE网络到所述2G或3G网络的CS域切换过程；
所述接收单元还用于接收所述MME发送的切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落；所述切换要求响应消息是所述MME在确定所述2G或3G网络的电路交换CS域没有可用资源的情况下发送的；
终止单元，用于根据所述终止指示，终止所述电路域回落。
第七方面，本发明实施例提供了一种用户设备，包括：
发送单元，用于向移动性管理实体MME发送请求消息，所述请求消息用于请求电路域回落；
接收单元，用于接收所述MME返回的请求拒绝消息，所述请求拒绝消息是所述MME在确定第二代2G或第三代3G网络的电路交换CS域没有可用资源的情况下发送的，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落；
处理单元，用于从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不请求电路域回落。
第八方面，本发明实施例提供了一种移动性管理实体，包括：
接收单元，用于接收移动交换中心MSC发送的寻呼消息，所述寻呼消息用于请求所述移动性管理实体对位于长期演进LTE网络的用户设备发起电路域回落；
确定单元，用于在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源；
处理单元，用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源后，不向所述用户设备发送电路域回落寻呼消息，以避免所述用户设备在接收到所述电路域回落寻呼消息之后选择2G或者3G网络进行语音业务。
结合第八方面，在第一种可能的实现方式中，所述移动性管理实体还包括： 第一发送单元；所述第一发送单元用于向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行电路域回落；
则所述接收单元还用于接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；
所述确定单元具体用于根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
结合第八方面，或者第八方面的第一种可能的实现方式，在第二种可能的实现方式中，所述移动性管理实体还包括：
第二发送单元，用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源之前，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行电路域回落；
所述接收单元还用于接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
结合第八方面的第二种可能的实现方式，在第三种可能的实现方式中，所述第二发送单元还用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源之后，向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落。
结合第八方面的第二种或第三种可能的实现方式，在第四种可能的实现方式中，所述第二发送单元还用于在向所述eNodeB发送所述通知消息之前，向处于空闲状态的所述用户设备发送分组域寻呼消息；所述接收单元还用于接收所述用户设备发送的业务请求消息。
第九方面，本发明实施例提供了一种移动性管理实体，其特征在于，包括总线，以及连接到所述总线的处理器、存储器、发送器和接收器；
所述存储器用于存储计算机执行指令，所述计算机执行指令被配置成由所述处理器执行；
所述接收器用于接收位于长期演进LTE网络的用户设备发送的请求消息， 所述请求消息用于请求电路域回落；
所述处理器用于在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源；
所述发送器，用于向所述用户设备发送请求拒绝消息，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落。
可选地，本发明实施例中的发送器的具体实现可以参考第五方面或第五方面任一种可能的实现方式所述的发送单元，本发明实施例中的接收器的具体实现可以参考第五方面或第五方面任一种可能的实现方式所述的接收单元，本发明实施例中的处理器的具体实现可以参考第五方面或第五方面任一种可能的实现方式所述的确定单元。
第十方面，本发明实施例提供了一种演进基站，其特征在于，包括总线，以及连接到所述总线的处理器、存储器、发送器和接收器；
所述存储器用于存储计算机执行指令，所述计算机执行指令被配置成由所述处理器执行；
所述接收器用于接收移动性管理实体MME发送的通知消息，所述通知消息用于指示所述演进基站将用户设备从长期演进LTE网络移动到第二代2G或第三代3G网络的电路交换CS域以进行电路域回落；
所述发送器用于向所述MME发送切换要求消息，以触发所述LTE网络到所述2G或3G网络的CS域切换过程；
所述接收器还用于接收所述MME发送的切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落；所述切换要求响应消息是所述MME在确定所述2G或3G网络的电路交换CS域没有可用资源的情况下发送的；
所述处理器用于根据所述终止指示，终止所述电路域回落。
第十一方面，本发明实施例提供了一种用户设备，其特征在于，包括总线，以及连接到所述总线的处理器、存储器、发送器和接收器；
所述存储器用于存储计算机执行指令，所述计算机执行指令被配置成由所述处理器执行；
所述发送器，用于向移动性管理实体MME发送请求消息，所述请求消息用于请求电路域回落；
所述接收器，用于接收所述MME返回的请求拒绝消息，所述请求拒绝消息是所述MME在确定第二代2G或第三代3G网络的电路交换CS域没有可用资源的情况下发送的，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落；
所述处理器，用于从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不请求电路域回落。
第十二方面，本发明实施例提供了一种移动性管理实体，其特征在于，包括总线，以及连接到所述总线的处理器、存储器、发送器和接收器；
所述存储器用于存储计算机执行指令，所述计算机执行指令被配置成由所述处理器执行；
所述接收器用于接收移动交换中心MSC发送的寻呼消息，所述寻呼消息用于请求所述移动性管理实体对位于长期演进LTE网络的用户设备发起电路域回落；
所述处理器用于在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源，在所述确定单元确定所述2G或3G网络的CS域没有可用资源后，不向所述用户设备发送电路域回落寻呼消息，以避免所述用户设备在接收到所述电路域回落寻呼消息之后选择2G或者3G网络进行语音业务。
可选地，本发明实施例中的发送器的具体实现可以参考第八方面或第八方面任一种可能的实现方式所述的第一发送单元和第二发送单元，本发明实施例中的接收器的具体实现可以参考第八方面或第八方面任一种可能的实现方式所述的接收单元，本发明实施例中的处理器的具体实现可以参考第八方面或第八方面任一种可能的实现方式所述的确定单元和处理单元。
第十三方面，本发明实施例提供了一种用于电路域回落的***，包括第五方面或第五方面任一种可能的实现方式所述的移动性管理实体，以及第六方面或第六方面任一种可能的实现方式所述的演进基站。
结合第十三方面，在第一种可能的实现方式中，所述***还包括第七方面 或第七方面任一种可能的实现方式所述的用户设备。
第十四方面，本发明实施例提供了一种用于电路域回落的***，包括第五方面或第五方面任一种可能的实现方式所述的移动性管理实体，以及第七方面或第七方面任一种可能的实现方式所述的用户设备。
结合第十四方面，在第一种可能的实现方式中，所述***还包括第六方面或第六方面任一种可能的实现方式所述的演进基站。
第十五方面，本发明实施例提供了一种用于电路域回落的***，包括第八方面或第八方面任一种可能的实现方式所述的移动性管理实体，以及第六方面或第六方面任一种可能的实现方式所述的演进基站。
在本发明实施例中，移动性管理实体可以在所述用户设备接入到2G或3G网络的CS域之前，获知所述2G或3G网络的CS域拥塞情况，在确定所述2G或3G网络的CS域没有可用资源时，终止电路域回落，避免所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入所述2G或3G网络，减少了不必要的LTE网络和2G或3G网络的信令流程，避免对LTE网络和2G或3G网络的信令冲击，减轻了网络的负荷，提升了用户体验。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的一种电路域回落的方法的流程图；
图2为本发明实施例提供的又一种电路域回落的方法的流程图；
图3为本发明实施例提供的又一种电路域回落的方法的流程图；
图4为本发明实施例提供的又一种电路域回落的方法的流程图；
图5为本发明实施例提供的一种移动性管理实体的示意图；
图6为本发明实施例提供的一种演进基站的示意图；
图7为本发明实施例提供的一种用户设备的示意图；
图8为本发明实施例提供的又一种移动性管理实体的示意图；
图9为本发明实施例提供的一种用于电路域回落的装置的结构示意图。
具体实施方式
本发明实施例提供一种电路域回落的方法，在实现电路域回落的过程中，LTE网络能够提前获知2G或3G网络的CS域网络拥塞情况，终止电路域回落呼叫流程，避免不必要的LTE网络和2G或3G网络的信令流程，避免对LTE网络和2G或3G网络的信令冲击，减轻了网络的负荷，提升了用户体验。本发明实施例还提供了相应的设备及***。以下分别进行详细说明。
如图1所示，本发明实施例提供了一种电路域回落的方法。在该方法中，位于LTE网络的用户设备(User Equipment，UE)作为主叫，向LTE网络的移动性管理实体(Mobile Managenment Entity，MME)请求CSFB。所述方法如下。
S101：MME接收位于LTE网络的用户设备发送的请求消息，所述请求消息用于请求CSFB。
S102：在所述LTE网络到2G或3G网络的CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源。
在进行CSFB过程中，需要将所述用户设备从所述LTE网络切换到2G或3G网络的CS域，从而所述MME可以在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，即在所述用户设备接入到2G或3G网络的CS域之前，判断所述2G或3G网络的CS域是否有可用资源，如果没有可用资源，表明所述2G或3G网络的CS域可能拥塞。
S103：所述MME向所述用户设备发送请求拒绝消息，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求CSFB。
所述MME向所述用户设备发送请求拒绝消息，拒绝本次CSFB，从而终止CSFB。进一步，由于用户设备可能在等待一段时间后再次重选到2G或3G网络发起语音流程，因此所述请求拒绝消息可以包含指示CS域不可用的原因值和定时器的值，使得所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不请求CSFB。
在本发明实施例中，MME可以在所述用户设备接入到2G或3G网络的CS 域之前，获知所述2G或3G网络的CS域拥塞情况，判断所述2G或3G网络的CS域是否有可用资源，在确定所述2G或3G网络的CS域没有可用资源时，向所述用户设备发送请求拒绝消息，从而拒绝本次CSFB。并且所述请求拒绝消息还包含指示CS域不可用的原因值和定时器的值，使得所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求CSFB，从而避免所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入所述2G或3G网络，也避免了所述用户设备在所述2G或3G网络的CS域拥塞的情况下再次请求CSFB回落到2G或3G网络，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
如图2所示，本发明实施例提供了一种CSFB的方法。在该方法中，移动交换中心(Mobile Services Switching Centre，MSC)可以请求MME发起CSFB(即也即发起CSFB呼叫)，位于LTE网络的用户设备可以作为被叫，所述方法如下。
S201：MME接收MSC发送的寻呼消息，所述寻呼消息用于请求所述MME对用户设备发起CSFB。
S202：在所述LTE网络到2G或3G网络的CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源。
在进行CSFB时，需要将所述用户设备从所述LTE网络切换到2G或3G网络的CS域，从而所述MME可以在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，即在所述用户设备接入到2G或3G网络的CS域之前，判断所述2G或3G网络的CS域是否有可用资源，如果没有可用资源，表明所述2G或3G网络的CS域可能拥塞。
S203：所述MME不向用户设备发送CSFB寻呼消息，以避免所述用户设备在接收到所述CSFB寻呼消息之后选择2G或者3G网络进行语音业务。
所述MME在确定所述2G或3G网络的CS域没有可用资源后，不向所述用户设备发送CSFB寻呼消息，使得用户设备接收不到CSFB寻呼请求，不仅避免了所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入所述2G或3G网络进行语音业务，也避免了所述用户设备在所述2G或3G网络的CS域拥塞的情况下再次选择2G或者3G网络进行语音业务，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
可选地，在S102或者S202之前，所述MME可以指示LTE网络的演进基站(Envolved NodeB，eNodeB)将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行CSFB，在eNodeB触发所述LTE网络到所述2G或3G网络的CS域切换之后，再判断所述2G或3G网络的CS域是否有可用资源，因而所述方法还包括：所述MME根据所述请求消息，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行CSFB；所述MME接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
进一步，在所述MME确定所述2G或3G网络的电路交换CS域没有可用资源之后，所述MME可以向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述CSFB。
这是因为对于某些eNodeB而言，在向MME发送切换要求消息之后，即使没有接收到所述MME返回的任何响应消息，也可能会继续执行CSFB将用户设备从LTE网络切换到2G或3G网络的CS域。因此，所述MME可以进一步向所述eNodeB发送包含所述终止指示的切换要求响应消息，使得所述eNodeB根据所述终止指示，终止所述CSFB，即不将所述用户设备从所述LTE网络切换到所述2G或3G网络的CS域，从而避免所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入到所述2G或3G网络后产生的乒乓效应，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
为更清楚地描述本发明的实施例，下面结合附图3和4，提供本发明所述的CSFB的方法的具体实施例，图1和图2的具体实现可以参考以下实施例。
参阅图3，本发明实施例提供了一种电路域呼叫的方法。
S301：UE向MME发送请求消息，所述请求消息用于请求CSFB。
所述请求消息可以是扩展业务请求。
可选地，所述MME可以判断LTE网络和2G或3G网络是否支持为CSFB将UE从LTE网络切换到2G或3G网络的CS域。MME也可以不进行判断，而是缺省认为通信网络支持为所述CSFB将所述UE从所述LTE网络切换到所述2G或3G网络的CS域，或者只对其中的某些通信网络进行判断，其中，所述通信网 络是所述LTE网络或所述2G或3G网络。
S302：所述MME根据所述扩展业务请求，向eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述UE从LTE网络移动到2G或3G网络的CS域以进行CSFB。也就是，通知消息用于指示所述eNodeB为了进行所述CSFB将所述UE从LTE网络移动到2G或3G网络。
当MME判断LTE网络和2G或3G网络支持为所述CSFB将所述UE从所述LTE网络切换到所述2G或3G网络的CS域，MME可以通过发送通知消息告知eNodeB LTE网络和2G或3G网络是否支持为所述CSFB将所述UE从所述LTE网络切换到2G或3G网络的CS域，以使eNodeB发起将所述UE从所述LTE网络切换到2G或3G网络的CS域的切换要求。
S303：所述eNodeB向所述MME发送切换要求消息。
所述切换要求消息用于指示将所述UE从所述LTE网络切换到所述2G或3G网络的CS域，即可以用于触发所述LTE网络到所述2G或3G网络的CS域切换过程所述切换要求消息。所述切换要求消息可以为从所述LTE网络到所述2G或3G网络的CS域切换要求消息，(例如：LTE to 2G或3G SRVCC HO Required消息)，或从所述LTE网络到所述2G或3G网络的PS域和CS域切换要求消息，(例如：LTE to 2G或3G SRVCC and PS HO Required消息)。
S304：所述MME向所述2G或3G网络中的MSC发送第一切换请求消息，所述第一切换请求消息用于请求所述MSC将所述UE从所述LTE网络切换到所述2G或3G网络的电路交换CS域。
S305：所述MSC向基站发送第二切换请求消息，所述第二切换请求消息用于请求所述基站为所述UE切换到所述2G或3G网络的CS域分配CS域资源。
本发明实施例中的基站包括基站控制器(Base Station Controller，BSC)或无线网络控制器(Radio Network Controller，RNC)。
S306：所述基站向所述MSC发送第二切换请求响应消息，所述第二切换请求响应消息中携带用于指示所述2G或3G网络的CS域没有可用资源的指示信息。
如果所述2G或3G网络的CS域无法分配CS域无线资源，例如目标小区没有无线资源，则所述基站可以在所述第二切换请求响应消息中携带用于指示所述2G或3G网络的CS域没有可用资源的指示信息，以通知所述MSC，所述2G或3G 网络的CS域无法分配CS域资源。
S307：所述MSC向所述MME发送第一切换响应消息，所述第一切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息。
在接收到所述第二切换请求响应消息之后，所述MSC可以响应所述第一切换请求消息，向所述MME而发送的第一切换响应消息，由于所述第一切换响应消息中包含了用于指示所述2G或3G网络的CS域没有可用资源的指示信息，则所述第一切换响应消息也可以包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息。
此外，在MSC没有资源的情况下，所述MSC向所述MME发送的第一切换响应消息也可以包含用于包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息。
S308：所述MME向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述CSFB。
所述MME在接收到包含用于包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息的第一切换响应消息时，可以通过向所述eNodeB发送终止指示来终止所述CSFB，避免所述eNodeB继续执行本次CSFB流程。
进一步，所述切换要求响应消息还可以包括用于指示所述2G或3G网络没有可用资源的指示信息。
S309：所述eNodeB终止所述CSFB。
具体地，所述eNodeB在接收到所述切换要求响应消息之后，不将所述UE从所述LTE网络转移到所述2G或3G网络，从而终止所述CSFB，从而避免所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入到所述2G或3G网络，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
S310：所述MME发送请求拒绝消息给所述UE，所述请求拒绝消息包含原因值和定时器的值，所述原因值为CS域不可用，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求CSFB。
例如，所述请求拒绝消息可以是业务拒绝(Service Reject)消息，该业务拒绝消息包含的原因值为CS业务暂时不可用(CS service temporarily not available)，业务拒绝消息包含的定时器的值为定时器T3442的值。
所述UE在接收到所述业务拒绝消息之后，启动定时器T3442，该定时器T3442的超时时间即为所述业务拒绝消息包含的T3442的值，所述UE在定时器T3442超时之前，不会尝试发起CSFB业务。不仅避免所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入所述2G或3G网络，也避免了所述用户设备在所述2G或3G网络的CS域拥塞的情况下再次请求CSFB回落到2G或2G网络，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
上述实施例中，是用户设备作为主叫的场景，当用户设备作为被叫时，可以参考图4所述的电路域切换的方法。在本发明实施例中，S403-S409的具体实现方式可以参考S303-S309，本发明实施例在此不再赘述。
S401：MSC发送寻呼消息给MME，以请求对用户设备发起CSFB呼叫流程。
所述寻呼消息具体可以是CS寻呼请求。
S402：所述MME根据所述寻呼消息，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行CSFB。
可选地，如果所述MME发现所述用户设备处于处于空闲状态，则所述MME可以向处于空闲状态的用户设备发送分组域寻呼消息，从而将所述用户设备从空闲状态变成连接状态，所述用户设备在接收到所述分组域寻呼消息之后，可以向所述MME发送业务请求消息。
S403：所述eNodeB向所述MME发送切换要求消息。
S404：所述MME向所述2G或3G网络中的MSC发送第一切换请求消息，所述第一切换请求消息用于请求所述MSC将所述UE从所述LTE网络切换到所述2G或3G网络的电路交换CS域。
S405：所述MSC向基站发送第二切换请求消息，所述第二切换请求消息用于请求所述基站为所述UE切换到所述2G或3G网络的CS域分配CS域资源。
S406：所述基站向所述MSC发送第二切换请求响应消息，所述第二切换请求响应消息中携带用于指示所述2G或3G网络的CS域没有可用资源的指示信息。
S407：所述MSC向所述MME发送第一切换响应消息，所述第一切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息。
S408：所述MME向所述eNodeB发送切换要求响应消息，以终止所述CSFB。
具体地，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述CSFB。
S409：所述eNodeB终止所述CSFB。
具体地，所述eNodeB在接收到所述切换要求响应消息之后，不将所述UE从所述LTE网络转移到所述2G或3G网络，从而终止所述CSFB。
S410：所述MME不向所述用户设备发送CSFB寻呼消息。
需要注意的是，现有技术中MME在接收到所述寻呼消息之后，会向用户设备发送CSFN寻呼消息。不同于现有技术，在本发明实施例中，所述MME在接收到所述用户设备发送的所述寻呼消息之后，如果确定所述2G或3G网络的CS域没有可用资源，则不向所述用户设备发送CSFB寻呼消息，以避免所述用户设备在接收到所述CSFB寻呼消息之后，自动选择2G或者3G网络进行语音业务，这样就避免了在选择2G或者3G网络进行语音业务之后由于2G或3G网络拥塞造成语音业务失败，又返回LTE网络，产生乒乓效应，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
对应于图1或图3所述的方法实施例，本发明实施例提供了一种移动性管理实体50，如图5所示，包括：接收单元501、确定单元502和发送单元503；
所述接收单元501，用于接收位于LTE网络的用户设备发送的请求消息，所述请求消息用于请求CSFB；
所述确定单元502，用于在所述LTE网络到2G或3G网络的CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源；
所述发送单元503，用于向所述用户设备发送请求拒绝消息，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求CSFB。
所述在所述LTE网络到2G或3G网络的CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源，在具体实现时，可以为：所述发送单元503向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述 MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行CSFB；所述接收单元501接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；则所述确定单元502可以根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
可选地，所述发送单元503还用于在所述确定单元502确定所述2G或3G网络的CS域没有可用资源之前，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行CSFB；所述接收单元501还用于接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。从而所述MME可以在接收到切换要求消息之后，再判断所述2G或3G网络的CS域是否有可用资源。
此外，在所述确定单元502确定所述2G或3G网络的CS域没有可用资源之后，所述发送单元503还可以，向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述CSFB。
本发明实施例提供的移动性管理网元的具体实现方式和与其他网元的交互，可以参考图1或图3所述的方法实施例，本发明实施例在此不再赘述。
在本发明实施例中，所述确定单元502可以在所述用户设备接入到2G或3G网络的CS域之前，获知所述2G或3G网络的CS域拥塞情况，判断所述2G或3G网络的CS域是否有可用资源，所述发送单元503可以在所述确定单元502确定所述2G或3G网络的CS域没有可用资源时，向所述用户设备发送请求拒绝消息，从而拒绝本次CSFB。并且所述请求拒绝消息还包含指示CS域不可用的原因值和定时器的值，使得所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求CSFB，从而避免所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入所述2G或3G网络，也避免了所述用户设备在所述2G或3G网络的CS域拥塞的情况下再次请求CSFB回落到2G或3G网络，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
对应于图1至图4任意之一所述的方法实施例，本发明实施例提供了一种演进基站，如图6所示，包括：接收单元601、发送单元602和终止单元603；
所述接收单元601用于接收MME发送的通知消息，所述通知消息用于指示所述演进基站将用户设备从长期演进LTE网络移动到第二代2G或第三代3G网络的电路交换CS域以进行CSFB；
所述发送单元602，用于向所述MME发送切换要求消息，以触发所述LTE网络到所述2G或3G网络的CS域切换过程；
所述接收单元601还用于接收所述MME发送的切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述CSFB；所述切换要求响应消息是所述MME在确定所述2G或3G网络的电路交换CS域没有可用资源的情况下发送的；
所述终止单元603，用于根据所述终止指示，终止所述CSFB。本发明实施例提供的演进基站的具体实现方式以及与其他网元的交互，可以参考图1至图4任意之一所述的方法实施例，本发明实施例在此不再赘述。
在本发明实施例中，所述MME可以在确定所述2G或者3G网络的CS域没有可用资源后，向所述eNodeB发送包含所述终止指示的切换要求响应消息，使得所述eNodeB可用根据所述终止指示，终止所述CSFB，即不将所述用户设备从所述LTE网络切换到所述2G或3G网络的CS域，从而避免所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入到所述2G或3G网络后产生的乒乓效应，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
对应于图1或图3所述的方法实施例，本发明实施例中提供了一种用户设备70，如图7所示，包括：发送单元701、接收单元702和处理单元703；
所述发送单元701，用于向MME发送请求消息，所述请求消息用于请求CSFB；
所述接收单元702，用于接收所述MME返回的请求拒绝消息，所述请求拒绝消息是所述MME在确定2G或3G网络的CS域没有可用资源的情况下发送的，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备70从接收到所述请求拒绝消息开始，到所述 定时器的值所对应的时长到达之前不能请求CSFB；
所述处理单元703，用于从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不请求CSFB。从而避免了所述用户设备70在所述2G或3G网络的CS域拥塞的情况下再次请求CSFB回落到2G或3G网络，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
本发明实施例提供的用户设备70的具体实现方式以及与其他网元的交互，可以参考图1或图3所述的方法实施例，本发明实施例在此不再赘述。
对应于图2或图4所述的方法实施例，本发明实施例提供了一种移动性管理实体80，如图8所示，包括接收单元801、确定单元802和处理单元803：
所述接收单元801，用于MSC发送的寻呼消息，所述寻呼消息用于请求所述移动性管理实体对位于LTE网络的用户设备发起CSFB；
所述确定单元802，用于在所述LTE网络到2G或3G网络的CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源；
所述处理单元803，用于在所述确定单元802确定所述2G或3G网络的CS域没有可用资源后，不向所述用户设备发送CSFB寻呼消息，以避免所述用户设备在接收到所述CSFB寻呼消息之后选择2G或者3G网络进行语音业务。
关于所述在所述LTE网络到2G或3G网络的CS域切换准备过程中，如何确定所述2G或3G网络的CS域没有可用资源，具体可以为：所述移动性管理实体还包括第一发送单元，用于向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行CSFB；则所述接收单元801还用于接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；所述确定单元802具体用于根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
可选地，所述移动性管理实体还包括：第二发送单元805，用于在所述确定单元802确定所述2G或3G网络的CS域没有可用资源之前，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从 所述LTE网络移动到2G或3G网络的CS域以进行CSFB；所述接收单元801还用于接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程，从而所述MME可以在接收到所述切换要求消息之后再判断所述2G或3G网络的CS域是否有可用资源。
可选地，所述第二发送单元805还用于在所述确定单元802确定所述2G或3G网络的CS域没有可用资源之后，向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述CSFB。
可选地，如果所述用户设备处于空闲状态，则所述第二发送单元805还可以在向所述eNodeB发送所述通知消息之前，向处于空闲状态的所述用户设备发送分组域寻呼消息；所述接收单元801还可以接收所述用户设备发送的业务请求消息。
本发明实施例提供的移动性管理网元的具体实现方式和与其他网元的交互，可以参考图2或图4所述的方法实施例，本发明实施例在此不再赘述。
在本发明实施例中，在所述确定单元802确定所述2G或3G网络的CS域没有可用资源后，所述处理单元803不向所述用户设备发送CSFB寻呼消息，使得用户设备接收不到CSFB寻呼请求，不仅避免了所述用户设备在所述2G或3G网络的CS域拥塞的情况下接入所述2G或3G网络进行语音业务，也避免了所述用户设备在所述2G或3G网络的CS域拥塞的情况下再次选择2G或者3G网络进行语音业务，减轻了对LTE网络和2G/3G网络的信令冲击，提高了用户体验。
本领域技术人员能够理解，上述图5至图8的实施例中，用于发送消息的单元，如发送单元503、发送单元602、发送单元701、第一发送单元804或第二发送单元805，可以采用发送器实现，或者采用收发器实现；用于接收消息的单元，如接收单元501、接收单元601、接收的那样702或接收单元801，可以采用接收器实现，或者采用收发器实现。在物理实现上，发送器或者接收器或收发器可以用一个物理实体实现，也可采用多个物理实体实现，发送器、接收器和收发器可以采用一个物理实体实现，也可以采用多个物理实体实现，本发明对此不做限制。其他单元，如确定单元502、终止单元603、处理单元703、确定 单元802或处理单元803，可以采用一个或多个处理器实现。上述发送器、接收器、收发器和处理器之间可以通过总线相连。
本发明实施例还提供了一种,用于电路域回落的装置，所述装置可以包括：
处理器901、存储器902、总线904、接收器905和发送器906。处理器901、存储器902、接收器905和发送器906之间通过总线904连接并完成相互间的通信。
处理器901可能为单核或多核中央处理单元，或者为特定集成电路，或者为被配置成实施本发明实施例的一个或多个集成电路。
存储器902可以为高速RAM存储器，也可以为非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。
存储器902用于存储计算机执行指令903。具体的，计算机执行指令903中可以包括程序代码。
当所述装置运行时，处理器901运行计算机执行指令903，可以执行图1至图4任意之一对应的方法实施例所述的电路域回落的方法流程。当执行图1或图3对应的方法实施例所述的电路域回落的方法流程时，所述装置可以为移动性管理实体、演进基站或者用户设备。当执行图2或图4对应的方法实施例所述的电路域回落的方法流程时，所述装置可以为移动性管理实体或者演进基站。
本发明实施例提供了一种计算机可读介质，包括计算机执行指令，以供计算机的处理器执行所述计算机执行指令时，所述计算机执行图1至图4任意之一对应的方法实施例所述电路域回落的方法流程。
本发明实施例还提供了一种用于电路域回落的***，包括移动性管理实体50和演进基站60；可选地，还可以包括用户设备70；移动性管理实体50、演进基站60和用户设备70各自执行的动作以及它们之间的交互，可以参见图1或图3对应的方法实施例的描述，也可以参考图5至图7对应的装置实施例的描述，此处不再赘述。
本发明实施例还提供了一种用于电路域回落的***，包括移动性管理实体50和用户设备70；可选地，还可以包括演进基站60；移动性管理实体50、演进基站60和用户设备70各自执行的动作以及它们之间的交互，可以参见图1或图3对应的方法实施例的描述，也可以参考图5至图7对应的装置实施例的描述，此 处不再赘述。
本发明实施例还提供了一种用于电路域回落的***，包括移动性管理实体80和演进基站60；可选地，还可以包括用户设备；移动性管理实体80、演进基站60和用户设备各自执行的动作以及它们之间的交互，可以参见图2或图4对应的方法实施例的描述，也可以参考图6或图8对应的装置实施例的描述，此处不再赘述。
本发明中所提到的LTE网络，包括LTE A网络、以及后续可能出现LTE版本。
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，也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分，或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的***、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过 程，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***、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置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***，或一些特征可以忽略，或不执行。另外，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，也可以是电的，机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本发明实施例方案的目的。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (26)

  1. 一种电路域回落的方法，其特征在于，包括：
    移动性管理实体MME接收位于长期演进LTE网络的用户设备发送的请求消息，所述请求消息用于请求电路域回落；
    在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源；
    所述MME向所述用户设备发送请求拒绝消息，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落。
  2. 根据权利要求1所述的方法，其特征在于，在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源包括：
    所述MME向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行电路域回落；
    所述MME接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；
    所述MME根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
  3. 根据权利要求1或2所述的方法，其特征在于，在所述MME确定所述2G或3G网络的CS域没有可用资源之前，所述方法还包括：
    所述MME根据所述业务请求消息，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行电路域回落；
    所述MME接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
  4. 根据权利要求3所述的方法，其特征在于，在所述MME确定所述2G或3G网络的CS域没有可用资源之后，所述方法还包括：
    所述MME向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落。
  5. 一种电路域回落的方法，其特征在于，所述方法包括：
    位于长期演进LTE网络的演进基站eNodeB接收移动性管理实体MME发送的通知消息，所述通知消息用于指示所述eNodeB将用户设备从所述LTE网络移动到第二代2G或第三代3G网络的电路交换CS域以进行电路域回落；
    所述eNodeB向所述MME发送切换要求消息，以触发所述LTE网络到所述2G或3G网络的CS域切换过程；
    所述eNodeB接收所述MME发送的切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落；所述切换要求响应消息是所述MME在确定所述2G或3G网络的电路交换CS域没有可用资源的情况下发送的；
    所述eNodeB根据所述终止指示，终止所述电路域回落。
  6. 一种电路域回落的方法，其特征在于，所述方法包括：
    位于长期演进LTE网络的用户设备向移动性管理实体MME发送请求消息，所述请求消息用于请求电路域回落；
    所述用户设备接收所述MME返回的请求拒绝消息，所述请求拒绝消息是所述MME在确定第二代2G或第三代3G网络的电路交换CS域没有可用资源的情况下发送的，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落；
    所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不请求电路域回落。
  7. 一种电路域回落的方法，其特征在于，包括：
    移动性管理实体MME接收移动交换中心MSC发送的寻呼消息，所述寻呼消息用于请求所述MME对位于长期演进LTE网络的用户设备发起电路域回落；
    在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源；
    所述MME不向所述用户设备发送电路域回落寻呼消息，以避免所述用户 设备在接收到所述电路域回落寻呼消息之后选择2G或者3G网络进行语音业务。
  8. 根据权利要求7所述的方法，其特征在于，在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，所述MME确定所述2G或3G网络的CS域没有可用资源包括：
    所述MME向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行电路域回落；
    所述MME接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；
    所述MME根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
  9. 根据权利要求7或8所述的方法，其特征在于，在所述MME确定所述2G或3G网络的CS域没有可用资源之前，所述方法还包括：
    所述MME根据所述业务请求消息，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行电路域回落；
    所述MME接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
  10. 根据权利要求9所述的方法，其特征在于，在所述MME确定所述2G或3G网络的CS域没有可用资源之后，所述方法还包括：
    所述MME向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落。
  11. 根据权利要求9或10所述的方法，其特征在于，在所述MME向所述eNodeB发送所述通知消息之前，所述方法还包括：
    所述MME向处于空闲状态的所述用户设备发送分组域寻呼消息；
    所述MME接收所述用户设备发送的业务请求消息。
  12. 一种移动性管理实体，其特征在于，包括：
    接收单元，用于接收位于长期演进LTE网络的用户设备发送的请求消息， 所述请求消息用于请求电路域回落；
    确定单元，用于在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源；
    发送单元，用于向所述用户设备发送请求拒绝消息，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落。
  13. 根据权利要求12所述的移动性管理实体，其特征在于，所述发送单元还用于向移动交换中心MSC发送切换请求消息，所述切换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行电路域回落；
    所述接收单元还用于接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；
    所述确定单元具体用于根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
  14. 根据权利要求12或13所述的移动性管理实体，其特征在于，所述发送单元还用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源之前，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行电路域回落；
    所述接收单元还用于接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
  15. 根据权利要求14所述的移动性管理实体，其特征在于，所述发送单元还用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源之后，向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落。
  16. 一种演进基站，其特征在于，包括：
    接收单元，用于接收移动性管理实体MME发送的通知消息，所述通知消息用于指示所述演进基站将用户设备从长期演进LTE网络移动到第二代2G或 第三代3G网络的电路交换CS域以进行电路域回落；
    发送单元，用于向所述MME发送切换要求消息，以触发所述LTE网络到所述2G或3G网络的CS域切换过程；
    所述接收单元还用于接收所述MME发送的切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落；所述切换要求响应消息是所述MME在确定所述2G或3G网络的电路交换CS域没有可用资源的情况下发送的；
    终止单元，用于根据所述终止指示，终止所述电路域回落。
  17. 一种用户设备，其特征在于，包括：
    发送单元，用于向移动性管理实体MME发送请求消息，所述请求消息用于请求电路域回落；
    接收单元，用于接收所述MME返回的请求拒绝消息，所述请求拒绝消息是所述MME在确定第二代2G或第三代3G网络的电路交换CS域没有可用资源的情况下发送的，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落；
    处理单元，用于从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不请求电路域回落。
  18. 一种移动性管理实体，其特征在于，包括：
    接收单元，用于接收移动交换中心MSC发送的寻呼消息，所述寻呼消息用于请求所述移动性管理实体对位于长期演进LTE网络的用户设备发起电路域回落；
    确定单元，用于在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源；
    处理单元，用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源后，不向所述用户设备发送电路域回落寻呼消息，以避免所述用户设备在接收到所述电路域回落寻呼消息之后选择2G或者3G网络进行语音业务。
  19. 根据权利要求18所述的移动性管理实体，其特征在于，还包括：第一发送单元；
    所述第一发送单元用于向移动交换中心MSC发送切换请求消息，所述切 换请求消息用于请求所述MSC将所述用户设备从所述LTE网络切换到所述2G或3G网络的电路交换CS域以进行电路域回落；
    则所述接收单元还用于接收所述MSC根据所述切换请求消息返回的切换响应消息，所述切换响应消息包含用于指示所述2G或3G网络的CS域没有可用资源的指示信息；
    所述确定单元具体用于根据所述切换响应消息，确定所述2G或3G网络的CS域没有可用资源。
  20. 根据权利要求18或19所述的移动性管理实体，其特征在于，还包括：
    第二发送单元，用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源之前，向演进基站eNodeB发送通知消息，所述通知消息用于指示所述eNodeB将所述用户设备从所述LTE网络移动到2G或3G网络的CS域以进行电路域回落；
    所述接收单元还用于接收所述eNodeB根据所述通知消息返回的切换要求消息，所述切换要求消息用于触发所述LTE网络到所述2G或3G网络的CS域切换过程。
  21. 根据权利要求20所述的移动性管理实体，其特征在于，所述第二发送单元还用于在所述确定单元确定所述2G或3G网络的CS域没有可用资源之后，向所述eNodeB发送切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落。
  22. 根据权利要求20或21所述的方法，其特征在于，所述第二发送单元还用于在向所述eNodeB发送所述通知消息之前，向处于空闲状态的所述用户设备发送分组域寻呼消息；
    所述接收单元还用于接收所述用户设备发送的业务请求消息。
  23. 一种移动性管理实体，其特征在于，包括总线，以及连接到所述总线的处理器、存储器、发送器和接收器；
    所述存储器用于存储计算机执行指令，所述计算机执行指令被配置成由所述处理器执行；
    所述接收器用于接收位于长期演进LTE网络的用户设备发送的请求消息，所述请求消息用于请求电路域回落；
    所述处理器用于在所述LTE网络到第二代2G或第三代3G网络的电路交换 CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源；
    所述发送器，用于向所述用户设备发送请求拒绝消息，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落。
  24. 一种演进基站，其特征在于，包括总线，以及连接到所述总线的处理器、存储器、发送器和接收器；
    所述存储器用于存储计算机执行指令，所述计算机执行指令被配置成由所述处理器执行；
    所述接收器用于接收移动性管理实体MME发送的通知消息，所述通知消息用于指示所述演进基站将用户设备从长期演进LTE网络移动到第二代2G或第三代3G网络的电路交换CS域以进行电路域回落；
    所述发送器用于向所述MME发送切换要求消息，以触发所述LTE网络到所述2G或3G网络的CS域切换过程；
    所述接收器还用于接收所述MME发送的切换要求响应消息，所述切换要求响应消息携带终止指示，所述终止指示用于指示所述eNodeb终止所述电路域回落；所述切换要求响应消息是所述MME在确定所述2G或3G网络的电路交换CS域没有可用资源的情况下发送的；
    所述处理器用于根据所述终止指示，终止所述电路域回落。
  25. 一种用户设备，其特征在于，包括总线，以及连接到所述总线的处理器、存储器、发送器和接收器；
    所述存储器用于存储计算机执行指令，所述计算机执行指令被配置成由所述处理器执行；
    所述发送器，用于向移动性管理实体MME发送请求消息，所述请求消息用于请求电路域回落；
    所述接收器，用于接收所述MME返回的请求拒绝消息，所述请求拒绝消息是所述MME在确定第二代2G或第三代3G网络的电路交换CS域没有可用资源的情况下发送的，所述请求拒绝消息包含指示CS域不可用的原因值和定时器的值，所述请求拒绝消息用于指示所述用户设备从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不能请求电路域回落；
    所述处理器，用于从接收到所述请求拒绝消息开始，到所述定时器的值所对应的时长到达之前不请求电路域回落。
  26. 本发明实施例提供了一种移动性管理实体，其特征在于，包括总线，以及连接到所述总线的处理器、存储器、发送器和接收器；
    所述存储器用于存储计算机执行指令，所述计算机执行指令被配置成由所述处理器执行；
    所述接收器用于接收移动交换中心MSC发送的寻呼消息，所述寻呼消息用于请求所述移动性管理实体对位于长期演进LTE网络的用户设备发起电路域回落；
    所述处理器用于在所述LTE网络到第二代2G或第三代3G网络的电路交换CS域切换准备过程中，确定所述2G或3G网络的CS域没有可用资源，在所述确定单元确定所述2G或3G网络的CS域没有可用资源后，不向所述用户设备发送电路域回落寻呼消息，以避免所述用户设备在接收到所述电路域回落寻呼消息之后选择2G或者3G网络进行语音业务。
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