WO2016106562A1 - Procédé, dispositif et système de repli à commutation de circuits - Google Patents

Procédé, dispositif et système de repli à commutation de circuits 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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WIPO (PCT)
Prior art keywords
domain
network
message
request
mme
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PCT/CN2014/095589
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English (en)
Chinese (zh)
Inventor
吴晓波
崇卫微
席国宝
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/095589 priority Critical patent/WO2016106562A1/fr
Priority to CN201480083783.2A priority patent/CN107005895A/zh
Publication of WO2016106562A1 publication Critical patent/WO2016106562A1/fr

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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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de repli à commutation de circuits. Avant qu'un équipement d'utilisateur accède à un domaine CS d'un réseau 2G ou 3G, un MME peut apprendre la situation de congestion du domaine CS du réseau 2G ou 3G, et mettre fin à un repli à commutation de circuits lorsqu'il est déterminé que le domaine CS du réseau 2G ou 3G n'a pas de ressources disponibles. De cette façon, l'équipement d'utilisateur est empêché d'accéder au réseau 2G ou 3G en cas de congestion du domaine CS du réseau 2G ou 3G, de sorte que la signalisation inutile qui circule entre un réseau LTE et le réseau 2G ou 3G est réduite, l'impact de la signalisation du réseau LTE sur le réseau 2G ou 3G est évité, la charge du réseau est allégée, et l'expérience utilisateur est également améliorée.
PCT/CN2014/095589 2014-12-30 2014-12-30 Procédé, dispositif et système de repli à commutation de circuits WO2016106562A1 (fr)

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