WO2015196366A1 - 一种节约语音资源的方法、设备及系统 - Google Patents

一种节约语音资源的方法、设备及系统 Download PDF

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Publication number
WO2015196366A1
WO2015196366A1 PCT/CN2014/080622 CN2014080622W WO2015196366A1 WO 2015196366 A1 WO2015196366 A1 WO 2015196366A1 CN 2014080622 W CN2014080622 W CN 2014080622W WO 2015196366 A1 WO2015196366 A1 WO 2015196366A1
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WO
WIPO (PCT)
Prior art keywords
service
network
voice
base station
msc
Prior art date
Application number
PCT/CN2014/080622
Other languages
English (en)
French (fr)
Inventor
吴晓波
邹烨
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2016574981A priority Critical patent/JP2017519452A/ja
Priority to AU2014399228A priority patent/AU2014399228B2/en
Priority to KR1020177000362A priority patent/KR20170016939A/ko
Priority to CN201480008344.5A priority patent/CN105393591A/zh
Priority to EP14895563.6A priority patent/EP3142413A4/en
Priority to PCT/CN2014/080622 priority patent/WO2015196366A1/zh
Publication of WO2015196366A1 publication Critical patent/WO2015196366A1/zh
Priority to US15/385,392 priority patent/US10187836B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224Control 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]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/02Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02Arrangements for increasing efficiency of notification or paging channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/12Inter-network notification
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/15Setup of multiple wireless link connections
    • H04W76/16Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for conserving voice resources.
  • 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
  • UE User Equipment
  • PS Packet Switching
  • CS Circuit Switching
  • the UE When the user equipment (UE) of the LTE coverage is processed by the user equipment (UE), the UE first falls back to the network with the CS domain, and processes the voice service in the network with the CS domain. In this way, the existing CS domain device is reused to provide traditional voice services for users in the LTE network.
  • the prior art requires the UE to switch from the LTE network to the PS domain of the 2G or 3G network or to the 2G or 3G network from the LTE network, and then initiate the connection of the CS domain on the 2G or 3G network.
  • the CSFB and the non-speech CSFB exist in the CSFB process, but the prior art causes a waste of voice resources in the process of implementing the non-voice CSFB service.
  • the embodiment of the present invention provides a method for saving voice resources.
  • the UE In the process of implementing a non-voice CSFB, the UE is not triggered to switch from the LTE network to the 2G or 3G network.
  • the CS domain, or the CS domain that triggers the UE to switch from the LTE network to the 2G or 3G network releases the voice resources reserved in the CS domain of the 2G or 3G network when the UE moves to the CS domain of the 2G or 3G network.
  • the embodiments of the present invention also provide corresponding devices and systems.
  • a first aspect of the present invention provides a method for saving voice resources, including:
  • the mobile management entity MME receives a first paging request message sent by the mobile switching center MSC for paging the user equipment UE, where the first paging request message includes first indication information, and the first indication information is used to indicate non- Voice service
  • the MME sends a notification message to the evolved base station eNodeB, where the notification message is used to indicate that the eNodeB does not switch the UE from the long term evolution LTE network to the non-voice service according to the first paging request message.
  • the notification message includes second indication information, where the second indication information is used to indicate the non-voice service.
  • the method further includes:
  • the MME receives a service request sent by the UE, and the service request is used to roll back a CSFB for a circuit domain service request circuit.
  • a second aspect of the present invention provides a method for saving voice resources, including:
  • the evolved base station eNodeB located in the LTE-LTE network receives the notification message sent by the mobility management entity MME, where the notification message is used to indicate that the eNodeB does not switch the user equipment UE from the LTE network to the second generation 2G for non-voice service or The CS domain of the third generation 3G network;
  • the eNodeB sends a handover request message from the LTE network to a packet switched PS domain of the 2G or 3G network to the MME, or
  • the eNodeB sends a redirection request to the UE.
  • the notification message includes second indication information, where the second indication information is used to indicate the non-voice service.
  • a third aspect of the present invention provides a method for saving voice resources, including: The mobile switching center MSC receives the first handover request message sent by the mobility management entity MME, where the first handover request message is used to request the MSC to switch the user equipment UE from the long-term evolution LTE network to the second generation 2G for the circuit domain service or Circuit switched CS domain of the third generation 3G network;
  • the MSC sends a second handover request message to the base station of the 2G or 3G network, where the second switch request message is used to request the base station to allocate voice resources for the circuit domain service;
  • the MSC determines that the circuit domain service is a non-voice service
  • the MSC sends a bearer release message to the base station to instruct the base station to release the voice resource.
  • the method further includes: the MSC receiving a service connection establishment request message sent by the UE, where the service connection establishment request message indicates that the circuit domain service is Non-voice service;
  • the MSC determines whether the circuit domain service is a non-voice service, and includes:
  • the MSC determines that the circuit domain service is a non-voice service according to the service connection establishment request message.
  • the MSC determines whether the circuit domain service is a non-voice service, including:
  • the circuit domain service is a non-voice service according to the type of the circuit domain service
  • the method further includes:
  • the MSC sends a service connection establishment request message to the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the method further includes:
  • the MSC determines that the circuit domain service is a non-voice service
  • the MSC sends a session release message to the UE, where the session release message is used to request that the UE release to switch from the LTE network to the A voice session generated during the CS domain of a 2G or 3G network.
  • a fourth aspect of the present invention provides a method for saving voice resources, including: The user equipment UE located in the LTE-based LTE network sends a request message to the mobility management entity MME, where the request message is used to roll back the CSFB for the circuit domain service request circuit;
  • a handover command sent by the eNodeB eNodeB where the handover command is used to indicate that the UE switches from the LTE network to the second generation 2G or the third generation 3G network to the 2G Information about voice resources allocated by the CS domain of the 3G network;
  • the UE after the UE sends a handover complete message to the base station of the 2G or 3G network, the UE receives the bearer release message sent by the base station, The method also includes:
  • the UE receives the service connection establishment request message sent by the MSC, and the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the method further includes:
  • the UE receives a session release message sent by the MSC, and the session release message is used to request the UE to release a voice session generated during a handover from the LTE network to the CS domain of the 2G or 3G network.
  • a fifth aspect of the present invention provides a mobility management entity MME, including:
  • a receiving unit configured to receive a first paging request message that is sent by the mobile switching center MSC for paging the user equipment UE, where the first paging request message includes first indication information, where the first indication information is used to indicate Non-voice service;
  • a sending unit configured to send, according to the first paging request message received by the receiving unit, a notification message to the evolved base station eNodeB, where the notification message is used to indicate that the eNodeB does not use the UE for the non-voice service Switching from a long-term evolution LTE network to a second-generation 2G or third-generation 3G network Road exchange CS domain.
  • the notification message includes second indication information, where the second indication information is used to indicate the non-voice service.
  • the sending unit is further configured to send a second paging request message to the UE;
  • the receiving unit is further configured to receive a service request sent by the UE, where the service request is used to roll back a CSFB for a circuit domain service request circuit.
  • a sixth aspect of the present invention provides an evolved base station eNodeB, 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 eNodeB does not switch the user equipment UE from the long term evolution LTE network to the second generation 2G or the third generation 3G for non-voice service
  • the CS domain of the network
  • a sending unit configured to send, according to the notification message received by the receiving unit, a handover request message from the LTE network to a packet switched PS domain of the 2G or 3G network, or to the UE Send a redirect request.
  • the notification message includes a second indication information, where the second indication information is used to indicate the non-voice service.
  • a seventh aspect of the present invention provides a mobile switching center MSC, including:
  • a receiving unit configured to receive a first handover request message sent by the mobility management entity MME, where the first handover request message is used to request the MSC to switch the user equipment UE from the long term evolution LTE network to the second generation 2G for the circuit domain service Or a circuit switched CS domain of a third generation 3G network;
  • a sending unit configured to send a second handover request message to the base station of the 2G or 3G network, where the second handover request message is used to request the base station to allocate a voice resource for the circuit domain service;
  • the receiving unit is further configured to receive a handover complete message sent by the base station;
  • a processing unit configured to determine, after the receiving unit receives the handover complete message, whether the circuit domain service is a non-voice service
  • the sending unit is configured to: when the processing unit determines that the circuit domain service is a non-voice service, send a bearer release message to the base station to instruct the base station to release the voice resource.
  • the receiving unit is further configured to receive a service connection establishment request message sent by the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service;
  • the processing unit is configured to determine, according to the service connection establishment request message received by the receiving unit, that the circuit domain service is a non-voice service.
  • the processing unit is configured to determine, according to the type of the circuit domain service, that the circuit domain service is a non-voice service;
  • the sending unit is further configured to send a service connection establishment request message to the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the first or the second possible implementation manner of the seventh aspect in a third possible implementation manner,
  • the sending unit is further configured to: when the processing unit determines that the circuit domain service is a non-voice service, send a session release message to the UE, where the session release message is used to request the UE to release the UE A voice session generated during the handover from the LTE network to the CS domain of the 2G or 3G network.
  • An eighth aspect of the present invention provides a user equipment UE that is located in a Long Term Evolution (LTE) network, and includes: a sending unit, configured to send a request message to a mobility management entity MME, where the request message is used to roll back a CSFB for a circuit domain service request circuit;
  • LTE Long Term Evolution
  • a receiving unit configured to receive a handover command sent by an evolved base station eNodeB, where the handover command is used to indicate that the UE is a circuit switched CS domain of the CSFB from the LTE network to a second generation 2G or a third generation 3G network And the switching command includes information that the 2G or 3G network is a voice resource allocated by the UE to the CS domain of the 2G or 3G network from the LTE network;
  • the sending unit is further configured to send a handover complete message to the base station;
  • the receiving unit is further configured to receive a bearer release message sent by the base station, where the bearer release message is used to indicate that the base station releases the voice resource.
  • the sending unit is further configured to: after sending a handover complete message to the base station of the 2G or 3G network, the receiving unit sends the bearer release message sent by the base station to the MSC before receiving the handover complete message a service connection establishment request message indicating that the circuit domain service is a non-voice service, or
  • the receiving unit is further configured to: after receiving the handover complete message to the base station, before receiving the bearer release message sent by the base station, receive the service connection establishment request message sent by the MSC, where the service connection is The setup request message indicates that the circuit domain service is a non-voice service.
  • the receiving unit is further configured to receive a session release message sent by the MSC, where the session release message is used to request the UE to release a CS domain generated during handover from the LTE network to the 2G or 3G network. Voice conversation.
  • a ninth aspect of the present invention provides a system for saving voice resources, including:
  • a mobility management entity MME a mobile switching center MSC, an evolved base station eNodeB;
  • a first paging request message for paging the user equipment UE receives, by the MME, a first paging request message for paging the user equipment UE, where the first paging request message includes first indication information, where the first indication information is used to indicate a non-voice service ;
  • the MME sends a notification message to the eNodeB, where the notification message is used to indicate that the eNodeB does not switch the UE from the long term evolution LTE network to the non-voice service.
  • the eNodeB sends a redirection request to the UE.
  • a tenth aspect of the present invention provides a system for saving voice resources
  • a base station of a mobility management entity MME a mobile switching center MSC, an evolved base station eNodeB, a second generation 2G or a third generation 3G network;
  • the user equipment UE located in the LTE-LTE network sends a request message to the MME, where the request message is used to roll back the CSFB for the circuit domain service request circuit.
  • 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 voice resources for the circuit domain service;
  • a handover command sent by the eNodeB where the handover command is used to instruct the UE to switch from the LTE network to a circuit switched CS domain of the 2G or 3G network, in the handover command.
  • Information including the voice resource;
  • the MSC determines that the circuit domain service is a non-voice service
  • the MSC sends a bearer release message to the base station to instruct the base station to release the voice resource.
  • the embodiment of the present invention does not trigger the UE to switch from the LTE network to the CS domain of the 2G or 3G network, or trigger the UE to switch from the LTE network to the CS domain of the 2G or 3G network.
  • the UE moves to the CS domain of the 2G or 3G network, the voice resources reserved in the CS domain of the 2G or 3G network are released, thereby saving voice resources.
  • FIG. 1 is a schematic diagram of an embodiment of a method for saving voice resources according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of another embodiment of a method for saving voice resources according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of another embodiment of a method for saving voice resources according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of another embodiment of a method for saving voice resources according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of another embodiment of a method for saving voice resources according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of another embodiment of a method for saving voice resources according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of an embodiment of a mobility management entity according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of an embodiment of an evolved base station according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of an embodiment of a mobile switching center according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of an embodiment of a user equipment according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of an embodiment of a system for saving voice resources according to an embodiment of the present invention.
  • the embodiment of the present invention provides a method for saving voice resources.
  • the UE does not trigger the UE to switch from the LTE network to the CS domain of the 2G or 3G network, or triggers the UE to switch from the LTE network to the 2G or 3G network.
  • the CS domain releases the voice resources reserved in the CS domain of the 2G or 3G network when the UE moves to the CS domain of the 2G or 3G network.
  • the embodiments of the present invention also provide corresponding devices and systems. The details are described below separately.
  • the Chinese and English versions and abbreviations of the partial communication nouns in the embodiments of the present invention include: Mobile Management Entity (MME), Envolved NodeB (eNodeB), User Equipment (UE), and Mobile Switching Center. (Mobile Services Switching Centre, MSC), second-generation or third-generation mobile communication technology (2rd Generation/3rd Generation, 2G or 3G), base station (BS), base station in the embodiment of the present invention includes a base station controller (Base Station Controller, BSC) and Radio Network Controller (RNC); Long Term Evolution (LTE), Serving GPRS Support Node (SGSN), Circuit Switched Fallback , CSFB), Terrestrial Radio Access Network (UTRAN), Global System of Mobile communication (GSM), Enhanced Data Rate for GSM Evolution (EDGE) Global System for Mobile Communications/Enhancement Data rate GSM evolution Surgery radio access network (GSM / EDGE Radio Access Network, GERAN).
  • MME Mobile Management Entity
  • eNodeB Envolved NodeB
  • UE
  • the first, second, third, fourth, fifth, etc. in the embodiments of the present invention are only used to distinguish different indication information, messages or other objects, and do not represent sequential relationships.
  • FIG. 1 is a process of saving voice resources in a circuit fallback network handover of a non-voice service according to an embodiment of the present invention, and an active call process after handover:
  • the UE sends an extended service request to the MME, where the extended service request is used to request the circuit to roll back the CSFB.
  • the MME can determine whether the LTE network and the 2G or 3G network support the UE to switch the UE from the LTE network to the CS domain of the 2G or 3G network.
  • the MME may also not judge, but default to consider that the communication network supports the CSFB to be described.
  • the UE switches from the LTE network to the CS domain of the 2G or 3G network, or only some of the networks.
  • the communication network is the LTE network and the 2G or 3G network.
  • the MME sends a notification message to the evolved base station eNodeB according to the extended service request, where the notification message is used to indicate that the eNodeB moves the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB. That is, the notification message is used to indicate that the eNodeB is the CSFB and the UE should be moved to a 2G or 3G network.
  • the MME may notify the network to switch to the 2G or 3G network by sending a notification message.
  • CS domain such that the eNodeB initiates a handover request for the CSFB to handover the UE from the LTE network to the CS domain of the 2G or 3G network.
  • the notification message may include indication information, and the indication information is used to indicate the CS domain of the through 3G network.
  • the indication information may be indication information of a single radio voice call continuity (SRVCC) handover, and is used to indicate that the LTE network and the 2G or 3G network support the UE for the CSFB Switching from the LTE network to the 2G or 3G network.
  • the indication information in the embodiment of the present invention may be referred to as an optimized CSFB indicator, a single radio voice call continuity (SRVCC) based CSFB indicator (SRVCC based CSFB Indicator), an enhanced CSFB indication. (enhanced CSFB indicator) or enhanced CSFB possible or SRVCC Operation possible.
  • the eNodeB sends a handover request message to the MME.
  • the handover request message may be a packet switched PS domain handover request message (eg, LTE to 2G or 3G PS HO Required message) from the LTE network to the 2G or 3G network, or from the LTE network to the Said CS domain handover request message of a 2G or 3G network, such as: LTE to 2G or 3G SRVCC HO Required message, or the PS domain and the CS from the LTE network to the 2G or 3G network Domain switch request message (for example: LTE to 2 G or 3G SRVCC and PS HO Required message).
  • PS domain handover request message eg, LTE to 2G or 3G PS HO Required message
  • the handover request message may include UE capability information, which is used to indicate the frequency band information, access capability, and the like supported by the UE.
  • the UE capability information may be at least one of class identifier 2 (classmark 2) and class identifier 3 (classmark 3).
  • classmark 2 class identifier 2
  • classmark 3 class identifier 3
  • the eNodeB when the UE does not support the CS handover of the LTE network to the 2G or 3G network, the eNodeB does not send the capability information of the UE to the MME, so the MME does not have the capability information of the UE.
  • the MME may send the capability information of the UE to the MSC, so that the MSC can perform handover to 2G or 3G CS.
  • the UE capability information may be delivered to the MME by using a handover request message.
  • the handover request message includes first indication information, where the first indication information is used to request the
  • the MME is configured to switch the UE from the LTE network to the CS domain of the 2G or 3G network, or the first indication information is used to request the MME to use the MME as the CSFB to Determining that the LTE network switches to the CS domain of the 2G or 3G network, and instructing the UE to support switching from the LTE network to the CS domain of the 2G or 3G network;
  • the switching request message includes a source-to-target transparent container, where the source-to-target transparent container includes second indication information, where the second indication information is used to request the base station of the 2G or 3G network to be the CSFB
  • the UE switches from the LTE network to the CS domain of the 2G or 3G network.
  • the first indication information may be referred to as a CSFB indication, an optimized CSFB indication, and an SRVCC-based CSFB indication, enhanced CSFB indication or enhanced CSFB possibility indication.
  • the MME may consider the UE to support by default.
  • the base station of the 2G or 3G network may consider the UE to support by default.
  • the second indication information and the first indication information may be referred to as a CSFB indication, an optimized CSFB indication, an SRVCC based CSFB indication, an enhanced CSFB indication, or an enhanced CSFB likelihood indication.
  • the second indication information may include a CSFB indication field, or a CSFB indication field and a UE capability field.
  • the CSFB indication field indicates that the MME switches the UE from the LTE network to the circuit switched CS domain of the 2G or 3G network for the CSFB.
  • the UE Capability field indicates that the UE supports handover from the LTE network to the PS domain of the 2G or 3G network.
  • the first indication information may include a CSFB indication field, or a CSFB indication field and a UE capability field.
  • the CSFB indication field indicates that the base station of the 2G or 3G network switches the UE from the LTE network to the circuit switched CS domain of the 2G or 3G network for the CSFB.
  • the UE Capability field indicates that the UE supports handover from the LTE network to the PS domain of the 2G or 3G network.
  • the eNodeB includes the second indication information in the source RNC to target RNC transparent container. You can use the existing source RNC to the CSFB information field in the target RNC transparent container as the CSFB indicator field. Can be at the source RNC to the target
  • a field is added to the RNC transparent container as the UE capability field.
  • the target network is a GERAN network
  • the eNodeB includes the second indication information in the old BSS to new BSS information.
  • the CSFB indicator field or the UE capability field may be added to the old BSS to the new BSS information.
  • the MME sends a first handover request message to the MSC, where the first handover request message is used to request the MSC to switch the user equipment UE from the long-term evolution LTE network to the second-generation 2G or third-generation 3G network for the circuit domain service. Circuit switched CS domain.
  • the first handover request message is sent by the MME to the MSC, the first handover request message
  • the required handover is a handover from the LTE network to the CS domain of the 2G or 3G network, that is, the first handover request is a PS to CS handover request.
  • the first handover request message may carry the third indication information, where the third indication information is used to request the CS domain, that is, the third indication information indicates that the first handover request is sent for the CSFB.
  • the third indication information may also indicate that the UE supports handover from the LTE network to the 2G or 3G network CS domain.
  • the first handover request message may also not indicate CSFB. At this time, the MSC considers that the first handover request is sent for CSFB by default.
  • the first handover request message may carry the UE capability information.
  • the capability information is at least one of a class identifier classmark2 and a class identifier classmark3.
  • the UE does not support the handover of the LTE network to the 2G or 3G network CS domain, the UE does not report the voice codec information it supports.
  • the MME can carry the default voice codec information in the first handover request message according to the target system of the handover. .
  • the third indication information in the first handover request message may be referred to as a CSFB indication, an optimized CSFB indication
  • CSFB indicator based on single radio voice call continuity (SRVCC) CSFB indicator (SRVCC based CSFB Indicator), enhanced CSFB indicator (enhanced CSFB indicator) or enhanced CSFB possibility indication (enhanced CSFB) Possible) o
  • the MSC ignores the STN-SR number.
  • the MME sends a second handover request message to the SGSN, where the second handover request message is used to request the SGSN to initiate a handover of the packet switched PS domain from the LTE network to the 2G or 3G network.
  • the MSC sends a third handover request message to the base station (BSC/RNC), where the third handover request message is used to request the base station to allocate voice resources for the circuit domain service.
  • the third handover request message is further configured to request the base station to switch the user equipment UE from the long-term evolution LTE network to the circuit-switched CS domain of the 2G or 3G network for the CSFB.
  • the base station allocates CS domain resources for the CS domain that the UE switches from the LTE network to the 2G or 3G network.
  • the CS language resource allocated by the base station includes a wired resource between the base station and the MSC and a radio resource between the base station and the UE.
  • the third handover request message includes fifth indication information, where the fifth indication information is used to request the base station to switch the UE from the LTE network to the CS domain for the CSFB;
  • the fifth indication information is used to indicate that the UE supports the handover of the LTE network to the CS domain of the 2G or 3G network.
  • the third handover request message includes a source-to-target transparent container, and the source-to-target transparent container includes the fifth indication information.
  • the MSC sets default voice codec information according to the type of the 2G or 3G network;
  • the default voice codec information may be included in the third handover request message.
  • the third handover request message includes Integrity Protection Information and/or force. Encryption Information, so that the base station sends a security mode command to the UE after receiving the handover complete message.
  • the base station sends a third handover request response message to the MSC, where the third handover request response message includes information about the CS domain radio resource, and the CS domain radio resource information is used by the UE from the LTE network. Switch to the CS domain of the 2G or 3G network.
  • the MSC sends a first handover response message to the MME, where the first handover response message includes information about the CS domain radio resource.
  • the MME sends a handover request response message to the eNodeB, where the handover request response message includes information about the CS domain radio resource.
  • the eNodeB sends a handover command to the UE, where the handover command includes information about the CS domain radio resource.
  • the UE receives, by the UE, a handover command sent by an evolved base station eNodeB, where the handover command is used to indicate
  • the UE is a circuit switched CS domain in which the CSFB is switched from the LTE network to a 2G or 3G network,
  • the information of the voice resource allocated by the C S domain of the 3G network is the information of the voice resource allocated by the C S domain of the 3G network.
  • the handover command includes fourth indication information, where the fourth indication information is used to indicate that the UE is to switch from the LTE network to the CS domain of the 2G or 3G network.
  • the handover command further includes information about a PS domain resource, and the UE switches from the LTE network to a PS domain of the 2G or 3G network according to the information of the PS domain resource.
  • the handover command may also be used to indicate that the UE switches from the LTE network to a PS domain of the 2G or 3G network.
  • the UE switches from the LTE network to the CS domain of the 2G or 3G network according to a handover command.
  • the UE uses the information of the resources included in the handover command to switch from the LTE network to the CS domain of the 2G or 3G network for the CSFB.
  • the UE generates a session in a process of handover from the LTE network to the CS domain of the 2G or 3G network.
  • the UE may also not generate a session during the handover from the LTE network to the CS domain of the 2G or 3G network.
  • the UE activates the CS domain encryption in the process of switching from the LTE network to the 2G network or the 3G network according to the CS encryption algorithm identifier.
  • the base station After receiving the handover complete message, the base station needs to carry a Location Area Identity (LAI) in the UTRAN Mobility Information sent to the UE in response to the handover complete message, which may be in this embodiment.
  • LAI Location Area Identity
  • the UE initiates a Location Area Update (LAU), which causes the CS call setup to fail.
  • LAU Location Area Update
  • the base station may not carry the location area identifier in the UTRAN mobility information sent to the UE.
  • the base station may send the LAI to the UE when the UTRAN mobility information is sent in a subsequent process.
  • the following method may be used:
  • the base station After receiving the handover complete message, the base station starts a timer, and after the timer expires, the base station The UTRAN mobility information is sent, and the LAI is sent to the UE. or,
  • the base station When the base station receives the call IU release command (IU RELEASE COMMAND) or the call connection (Connect) message, the base station transmits the UTRAN mobility information and sends the LAI to the UE. For the calling party, the MSC sends a call connection Connect message to the UE; for the called party, the UE sends a call connection Connect message to the MSC.
  • the base station when the UE sends the LAU message to the base station, to avoid the failure, the base station does not send a location update request message to the MSC, and the base station directly sends a location update accept message to the UE.
  • the base station forwards the handover complete message in step S145 to the MSC.
  • the MSC After receiving the handover complete message sent by the base station, the MSC determines whether the circuit domain service is a non-voice service. When the MSC determines that the circuit domain service is a non-voice service, the MSC sends a bearer release to the base station. a message to instruct the base station to release the voice resource.
  • the specific judgment process and the process of releasing the voice resources can be understood by referring to S155 ⁇ S196b.
  • S155 The UE sends a connection management service request, such as a CM Serivce Request message, to the MSC.
  • the MSC sends an Authenticate Request to the UE.
  • This step S160 may also not be performed, that is, the MSC does not send an authentication request message to the UE.
  • the UE sends an Authenticate Response to the MSC.
  • the MSC sends a security mode command to the base station, and carries Integrity Protection Information and/or Encryption Information, so that the base station sends a security mode command to the UE.
  • This step S170 may also not be performed, that is, the MSC does not send a security mode command to the base station.
  • the base station sends a security mode command to the UE. Specifically, the base station performs this step according to the security mode command in step S170, or the base station performs this step after receiving the S145 message.
  • the MSC sends a connection management service acceptance command to the UE.
  • the UE sends a service connection establishment request message to the MSC, where the service connection establishment request message is used to request the MSC to establish a non-voice service, such as a location service (LCS) or an unstructured supplementary data service, for the CSFB. (Unstructured Supplementary Service Data, USSD).
  • a non-voice service such as a location service (LCS) or an unstructured supplementary data service, for the CSFB. (Unstructured Supplementary Service Data, USSD).
  • the UE may receive a service connection establishment request message sent by the MSC, where the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the MSC receives a service connection establishment request message sent by the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service;
  • the MSC determines whether the circuit domain service is a non-voice service, and may include:
  • the MSC determines that the circuit domain service is a non-voice service according to the service connection establishment request message.
  • the MSC may determine, according to the type of the circuit domain service, that the circuit domain service is a non-voice service;
  • the method may further include:
  • the MSC sends a service connection establishment request message to the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the MSC After receiving the service connection establishment request or the connection management service request, the MSC sends a session release message (such as a Disconnect message) to the UE, where the session release message is used to request the UE to release the UE.
  • a session release message such as a Disconnect message
  • the LTE network switches to a session generated in a CS domain process of the 2G or 3G network.
  • the UE After the UE receives the session release message sent by the MSC, the UE sends a session release request message (such as a Release message).
  • a session release request message such as a Release message
  • the MSC After receiving the session release request message, the MSC sends a session release request completion message (such as a Release complete message).
  • the MSC when the MSC determines that the circuit domain service is a non-voice service, the MSC sends a session release message to the UE, where the session release message is used to request the UE to release the UE at the The voice session generated by the LTE network to switch to the CS domain of the 2G or 3G network.
  • the MSC sends a bearer release message to the base station (BSC/RNC) of the 2G or 3G network,
  • BSC/RNC base station
  • the base station releases the voice resource of the CS domain allocated by the base station to the CS domain of the 2G or 3G network by the base station in step S121.
  • S196b The base station of the 2G or 3G network sends a bearer release message to the UE, so that the UE releases the voice resource of the CS domain allocated by the base station to the CS domain of the 2G or 3G network.
  • the called party picks up the phone and enters the call state.
  • the UE When the call ends, since the call is triggered by CSFB, the UE needs to return after completing the call.
  • the base station determines, according to the third handover request message, that the call is triggered by the CSFB,
  • the base station of the 2G or 3G network After the base station of the 2G or 3G network receives the call release message sent by the MSC, the base station of the 2G or 3G network redirects the UE to the LTE network, or the base station switches the UE to In the LTE network, the call release message is a release command Iu Release Command or a clear command Clear Command.
  • the base station may parse the CS signaling between the UE and the MSC.
  • the base station receives signaling messages sent by the UE to the MSC, such as a connection management service request, an authentication response, a first CS call connection setup request message, and the like.
  • the base station may send the signaling message to the MSC using a connection established during handover of the LTE network to the CS domain of the 2G or 3G network, or send the signaling message to the MSC using a direct transmission message.
  • the indication information, the first indication information, the second indication information, the third indication information, the fourth indication information, and the fifth indication information included in the notification message may include a CSFB indication field, or a CSFB indication field and a UE capability.
  • the CSFB indication field indicates that the MME or the MSC or the 2/3G network base station switches the UE from the LTE network to the circuit switched CS domain of the 2G or 3G network for the CSFB.
  • the UE capability field indicates that the UE supports switching from the LTE network to the 2G or
  • the PS domain of the 3G network is the PS domain of the 3G network.
  • the UE is triggered to switch from the LTE network to the CS domain of the 2G or 3G network during the non-voice type circuit fallback process, and is released in the 2G or 3G when the UE moves to the CS domain of the 2G or 3G network.
  • the voice resources reserved in the CS domain of the network thereby saving voice resources.
  • FIG. 2a illustrates a process of saving voice resources and a passive call process after handover in a circuit fallback network handover of a non-voice service according to an embodiment of the present invention: SOb-SOc:
  • the MSC sends a CS paging request to the MME, and the MME triggers the paging process.
  • the MSC sends a paging message to the MME, where the paging message indicates that the current service is a non-voice service, such as a USSD or an LCS service.
  • S200 and S200a are the same as S100 and SlOOa, and are not described here.
  • the MME sends a notification message to the evolved base station eNodeB, where the notification message is used to indicate that the eNodeB does not switch the UE from the long term evolution LTE network to the second generation 2G or third generation 3G network for the non-voice service.
  • CS domain The MME sends a notification message to the evolved base station eNodeB, where the notification message is used to indicate that the eNodeB does not switch the UE from the long term evolution LTE network to the second generation 2G or third generation 3G network for the non-voice service.
  • the eNodeB sends a handover request message to the MME, where the handover request message is used to request to move the UE from an LTE network to a PS domain of a 2G or 3G network, or the eNodeB uses the redirection procedure to send the UE. Move to the 2G or 3G network.
  • the eNodeB does not use the handover procedure of the CS domain moving from the LTE network to the 2G or 3G network to move the UE to the 2G or 3G network, but uses the handover of the PS domain from the LTE network to the 2G or 3G network or A redirection procedure moves the UE to the 2G or 3G network.
  • the UE is not triggered to switch from the LTE network to the CS domain of the 2G or 3G network during the non-voice type circuit fallback process, thereby saving voice resources.
  • FIG. 2b illustrates a process of saving voice resources and a passive call process after handover in a circuit fallback network handover of a non-voice service according to an embodiment of the present invention:
  • the MSC sends a CS paging request to the MME, and the MME triggers the paging process.
  • the MSC sends a paging message to the MME, where the paging message indicates that the current service is a non-voice service, such as a USSD or an LCS service.
  • a non-voice service such as a USSD or an LCS service.
  • Steps S200-S250 are the same as steps S100-S150 in FIG. 1, and are not described herein again.
  • the UE sends a paging response to the MSC.
  • the MSC sends an authentication request to the UE.
  • This step S260 may also not be performed, that is, the MSC does not send an authentication request message to the UE. S265. The UE sends an authentication response to the MSC.
  • the MSC sends a security mode command to the base station, and carries Integrity Protection Information and/or Encryption Information, so that the base station sends the security information. Full mode command to the UE.
  • This step S270 may also not be performed, that is: the MSC does not send a security mode command to the base station.
  • the base station sends a security mode command to the UE. Specifically, the base station performs this step according to the security mode command in step S270, or the base station performs this step after receiving the S245 message.
  • the MSC sends a service connection establishment request message to the UE, where the service connection establishment request message is used to request the MSC to establish a non-voice service, such as a location service (LCS) or an unstructured supplementary data service, for the CSFB. (Unstructured Supplementary Service Data, USSD).
  • a non-voice service such as a location service (LCS) or an unstructured supplementary data service, for the CSFB.
  • LCS location service
  • USSD Unstructured Supplementary Service Data
  • the UE may receive the service connection establishment request message sent by the MSC, where the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the MSC receives a service connection establishment request message sent by the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service;
  • the MSC determines whether the circuit domain service is a non-voice service, and may include:
  • the MSC determines that the circuit domain service is a non-voice service according to the service connection establishment request message.
  • the MSC may determine, according to the type of the circuit domain service, that the circuit domain service is a non-voice service;
  • the method may further include:
  • the MSC sends a service connection establishment request message to the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the MSC After receiving the handover complete message or the MSC sends a service connection setup request message, the MSC sends a session release message (such as a Disconnect message) to the UE, where the session release message is used to request the UE.
  • a session release message such as a Disconnect message
  • a session release message sent by the MSC where the session release message is used to request the UE to release the UE during handover from the LTE network to the CS domain of the 2G or 3G network.
  • the generated voice session is used to request the UE to release the UE during handover from the LTE network to the CS domain of the 2G or 3G network.
  • the UE After the UE receives the session release message sent by the MSC, the UE sends a session release request message (such as a Release message).
  • a session release request message such as a Release message
  • the MSC After receiving the session release request message, the MSC sends a session release request completion message (such as a Release complete message).
  • the MSC sends a bearer release message to the BSC/RNC, so as to release the CS domain voice resource allocated by the base station to the CS domain of the 2G or 3G network for the UE in step S221.
  • the base station of the 2G or 3G network sends a bearer release message to the UE, and releases the base station to allocate CS domain voice resources to the CS domain that the UE switches to the 2G or 3G network.
  • the UE When the call ends, since the call is triggered by CSFB, the UE needs to return after completing the call.
  • the base station determines, according to the third handover request message, that the call is triggered by the CSFB. Therefore, after receiving the call release message sent by the MSC, the base station of the 2G or 3G network, the base station of the 2/3G network The UE is redirected to the LTE network, or the base station switches the UE to the LTE network, and the call release message is a release command Iu Release Command or a clear command Clear Command.
  • the base station may parse the CS signaling between the UE and the MSC.
  • the base station receives signaling messages sent by the UE to the MSC, such as a call confirmation message, an authentication response, a second CS call connection setup request message, and the like.
  • the base station may send the signaling message to the MSC using a connection established during the handover of the LTE network to the CS domain of the 2G or 3G network, or send the signaling message to the MSC using a direct transmission message.
  • the indication information, the second indication information, the third indication information, the fourth indication information, and the fifth indication information included in the notification message may include a CSFB indication field, or a CSFB indication field and a UE capability field.
  • the CSFB indication field indicates that the MME is the CSFB to switch the UE from the LTE network to the circuit switched CS domain of the 2G or 3G network.
  • the UE Capability field indicates that the UE supports handover from the LTE network to the PS domain of the 2G or 3G network.
  • the UE does not trigger the handover from the LTE network to the CS domain of the 2G or 3G network, or triggers the UE to switch from the LTE network to the CS domain of the 2G or 3G network, and moves the UE to 2G or 3G.
  • the CS domain of the network is released, the CS domain in the 2G or 3G network is released to reserve voice resources. This saves valuable voice resources.
  • the above two application scenarios describe the entire network switching and session process from two aspects: the UE calling party and the UE calling.
  • an embodiment of a method for saving voice resources includes: 101.
  • a mobility management entity MME receives a paging user equipment sent by a mobile switching center MSC.
  • the first paging request message includes first indication information, where the first indication information is used to indicate a non-voice service.
  • the MME sends a notification message to the evolved base station eNodeB according to the first paging request message, where the notification message is used to indicate that the eNodeB does not switch the UE from the long term evolution LTE network for the non-voice service.
  • Circuit switched CS domain to second generation 2G or third generation 3G networks.
  • the method shown in Figure 3 also includes:
  • the MME receives a service request sent by the UE, and the service request is used to roll back a CSFB for a circuit domain service request circuit.
  • another embodiment of a method for saving voice resources includes: 201.
  • An evolved base station eNodeB located in a long term evolution LTE network receives a notification message sent by a mobility management entity MME, where the notification message is used to indicate The eNodeB does not switch the user equipment UE from the LTE network to the CS domain of the second generation 2G or third generation 3G network for non-voice services.
  • the eNodeB sends, to the MME, a handover request message from the LTE network to a packet switched PS domain of the 2G or 3G network according to the notification message, or the eNodeB sends a redirect to the UE. request.
  • a mobile switching center MSC receives a first handover request message sent by a mobility management entity MME, where the first handover request message is used. Requesting the MSC to serve the user equipment UE from the circuit domain service
  • the Long Term Evolution (LTE) network switches to the circuit switched CS domain of the second generation 2G or third generation 3G network.
  • LTE Long Term Evolution
  • the MSC sends a second handover request message to the base station of the 2G or 3G network, where the second handover request message is used to request the base station to allocate voice resources for the circuit domain service.
  • the MSC receives a handover complete message sent by the base station.
  • the MSC receives a handover complete message sent by the base station.
  • the MSC determines that the circuit domain service is a non-voice service
  • the MSC sends a bearer release message to the base station to instruct the base station to release the voice resource.
  • the method shown in Figure 5 also includes:
  • the MSC determines whether the circuit domain service is a non-voice service, and includes:
  • the MSC determines that the circuit domain service is a non-voice service according to the service connection establishment request message.
  • the MSC determines whether the circuit domain service is a non-voice service, and includes:
  • the circuit domain service is a non-voice service according to the type of the circuit domain service
  • the method further includes:
  • the MSC sends a service connection establishment request message to the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the MSC determines that the circuit domain service is a non-voice service
  • the MSC sends a session release message to the UE, where the session release message is used to request that the UE release to switch from the LTE network to the A voice session generated during the CS domain of a 2G or 3G network.
  • FIG. 6 another embodiment of a method for saving voice resources provided by an embodiment of the present invention includes:
  • the user equipment of the Long Term Evolution (LTE) network sends a request message to the mobility management entity MME, where the request message is used to roll back the CSFB for the circuit domain service request circuit.
  • LTE Long Term Evolution
  • the UE receives a handover command sent by an evolved base station eNodeB, where the handover command is used. Instructing the UE to switch from the LTE network to a circuit-switched CS domain of a second-generation 2G or third-generation 3G network, where the handover command includes the 2G or 3G network as the UE from the The LTE network switches to information of voice resources allocated by the CS domain of the 2G or 3G network.
  • the UE sends a handover complete message to a base station of the G or 3G network.
  • the UE receives a bearer release message sent by the base station, where the bearer release message is used to instruct the base station to release the voice resource.
  • the method shown in FIG. 6 may further include:
  • the UE receives the service connection establishment request message sent by the MSC, and the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the UE receives a session release message sent by the MSC, and the session release message is used to request the UE to release a voice session generated during a handover from the LTE network to the CS domain of the 2G or 3G network.
  • the mobility management entity MME 60 provided by the embodiment of the present invention includes: a receiving unit 601 and a sending unit 602.
  • the receiving unit 601 is configured to receive, by the mobile switching center MSC, a first paging request message for paging the user equipment UE, where the first paging request message includes first indication information, where the first indication information is used by Indicates a non-voice service.
  • the sending unit 602 is configured to send, according to the first paging request message received by the receiving unit 601, a notification message to the evolved base station eNodeB, where the notification message is used to indicate that the eNodeB does not use the non-voice service
  • the UE switches from a Long Term Evolution LTE network to a circuit switched CS domain of a second generation 2G or third generation 3G network.
  • the sending unit 602 is further configured to send a second paging request message to the UE, where the receiving unit 601 is further configured to receive a service request sent by the UE, where the service request is used to request a circuit domain service.
  • the circuit rolls back CSFB.
  • the notification message includes second indication information, where the second indication information is used to indicate the non-voice service.
  • the mobility management entity in this embodiment may perform the method steps of the MME described in the method embodiment of FIG. 2a and FIG. 3, the receiving unit 601 is configured to receive a message sent by another entity to the MME, and the sending unit 602 is configured to send a message to other entities. .
  • a person skilled in the art may refer to FIG. 8 according to the foregoing method embodiments.
  • the evolved base station 70 provided by the embodiment of the present invention includes: a receiving unit 701 and a sending unit.
  • the receiving unit 701 is configured to receive a notification message sent by the mobility management entity MME, where the notification message is used to indicate that the eNodeB does not switch the user equipment UE from the long term evolution LTE network to the second generation 2G or third generation for the non-voice service.
  • the CS domain of the 3G network is configured to receive a notification message sent by the mobility management entity MME, where the notification message is used to indicate that the eNodeB does not switch the user equipment UE from the long term evolution LTE network to the second generation 2G or third generation for the non-voice service.
  • the sending unit 702 is configured to send, according to the notification message received by the receiving unit, a handover request message from the LTE network to a packet switched PS domain of the 2G or 3G network, or The UE sends a redirect request.
  • the notification message includes second indication information, where the second indication information is used to indicate the non-voice service.
  • the evolved base station in this embodiment may perform the method steps of the evolved base station described in the method embodiments of FIG. 2a and FIG. 4, and the receiving unit 701 is configured to receive a message sent by another entity to the evolved base station.
  • the receiving unit 701 is configured to receive a message sent by another entity to the evolved base station.
  • the mobile switching center MSC 80 includes: a receiving unit 801, a sending unit 802, and a processing unit 803.
  • the receiving unit 801 is configured to receive a first handover request message sent by the mobility management entity MME, where the first handover request message is used to request the MSC to switch the user equipment UE from the long-term evolution LTE network to the second generation for the circuit domain service. Circuit switched CS domain for 2G or 3G 3G networks.
  • the sending unit 802 is configured to send a second handover request message to the base station of the 2G or 3G network, where the second handover request message is used to request the base station to allocate voice resources for the circuit domain service; And being further configured to receive a handover complete message sent by the base station;
  • the processing unit 803 is configured to determine, after the receiving unit 801 receives the handover complete message, whether the circuit domain service is a non-voice service.
  • the sending unit 802 is configured to: when the processing unit 803 determines that the circuit domain service is a non-voice service, send a bearer release message to the base station to instruct the base station to release the voice resource.
  • the receiving unit 801 is further configured to receive a service connection establishment request message sent by the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service;
  • the processing unit 802 is configured to determine, according to the service connection establishment request message received by the receiving unit 801, that the circuit domain service is a non-voice service.
  • the processing unit 803 is configured to determine, according to the type of the circuit domain service, that the circuit domain service is a non-voice service;
  • the sending unit 802 is further configured to send a service connection establishment request message to the UE, where the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the sending unit 802 is further configured to: when the processing unit 803 determines that the circuit domain service is a non-voice service, send a session release message to the UE, where the session release message is used to request the UE to release the A voice session generated by the UE during handover from the LTE network to the CS domain of the 2G or 3G network.
  • the MSC in this embodiment may perform the method steps of the MSC described in the method embodiments of FIG. 1, FIG. 2b and FIG. 5, and the receiving unit 801 is configured to receive a message sent by another entity to the MSC, and the sending unit 803
  • the user equipment 90 provided by the embodiment of the present invention includes: a sending unit 901 and a receiving unit 902.
  • the sending unit 901 is configured to send a request message to the mobility management entity MME, where the request message is used to roll back the CSFB for the circuit domain service request circuit.
  • the receiving unit 902 is configured to receive a handover command sent by the evolved base station eNodeB, where the handover command is a circuit switched CS domain for indicating that the UE is a handover of the CSFB from the LTE network to a second generation 2G or a third generation 3G network, where the handover command includes the 2G or 3G network as the UE
  • the LTE network switches to information of voice resources allocated by the CS domain of the 2G or 3G network.
  • the sending unit 901 is further configured to send a handover complete message to the base station of the 2G or 3G network; the receiving unit 902 is further configured to receive a bearer release message sent by the base station, where the bearer release message is used to indicate the The base station releases the voice resource.
  • the sending unit 901 is further configured to: after receiving the handover complete message to the base station, the receiving unit sends a service connection establishment request message to the MSC before receiving the bearer release message sent by the base station of the 2G or 3G network, where The service connection establishment request message indicates that the circuit domain service is a non-voice service, or
  • the receiving unit 902 is further configured to: after the sending unit 901 sends a handover complete message to the base station, receive a service connection establishment request message sent by the MSC, before receiving the bearer release message sent by the base station,
  • the service connection establishment request message indicates that the circuit domain service is a non-voice service.
  • the receiving unit 902 is further configured to receive a session release message sent by the MSC, where the session release message is used to request the UE to release a CS domain in the handover from the LTE network to the 2G or 3G network.
  • the generated voice session is further configured to receive a session release message sent by the MSC, where the session release message is used to request the UE to release a CS domain in the handover from the LTE network to the 2G or 3G network.
  • the UE in this embodiment may perform the method steps of the UE described in the method embodiment of FIG. 1, FIG. 2b or FIG. 6, the receiving unit 902 is configured to receive a message sent by another entity to the UE, and the sending unit 901 is configured to
  • the UE does not trigger the handover from the LTE network to the CS domain of the 2G or 3G network, or triggers the UE to switch from the LTE network to the CS of the 2G or 3G network in the process of implementing the non-voice type circuit fallback.
  • the domain when the UE moves to the CS domain of the 2G or 3G network, releases the voice resources reserved in the CS domain of the 2G or 3G network, thereby saving voice resources.
  • the sending unit for transmitting the message can be implemented by using the transmitter, and the receiving unit for receiving the message can be implemented by the receiver.
  • both the transmitting unit and the receiving unit can be implemented using a transceiver.
  • the transmitter or The transceiver may be implemented by one physical entity or multiple physical entities.
  • the transmitter and the transceiver may be implemented by one physical entity or multiple physical entities. The present invention does not limit this.
  • the unit of the processing unit 1 can be implemented by one or more processors, which is not limited in the present invention.
  • an embodiment of a network switching system includes: a mobility management entity 60, an evolved base station 70, a mobile switching center 80, a base station 100, and a user equipment 90;
  • the actions performed by the mobility management entity 60, the evolved base station 70, the mobile switching center 80, the base station 100, and the user equipment 90, and the interaction between them, can be seen in the description of FIG. 2a, and FIG. 3, FIG. 4, FIG. 7, FIG. Description of method embodiments and device embodiments, and details are not described herein again.
  • FIG. 1 and FIG. 2b the actions performed by the mobility management entity 60, the evolved base station 70, the mobile switching center 80, the base station 100, and the user equipment 90 and the interaction between them may be referred to the descriptions of FIG. 1 and FIG. 2b, and FIG. 5 and FIG. 9 and FIG. 10 are descriptions of method embodiments and device embodiments, and are not described herein again.
  • FIG. 5 and FIG. 9 and FIG. 10 are descriptions of method embodiments and device embodiments, and are not described herein again.
  • the coupling or communication connection may be an indirect connection or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the components displayed by the unit 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.
  • 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 removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .
  • the LTE network mentioned in the present invention, including the LTE A network, and the subsequent LTE version may appear.

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Abstract

本发明公开了一种节约语音资源的方法,包括:所述MME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不为所述非语音业务把UE从长期演进LTE网络切换到第二代2G或第三代3G网络的电路交换CS域,或者,当所述MSC判断所述电路域业务为非语音业务时,所述MSC向基站发送承载释放消息以指示所述基站释放所述语音资源。本发明提供的节约语音资源的方法,可以在实现非语音类业务过程中,不触发UE从LTE网络切换到2G或者3G网络的CS域,或者触发UE从LTE网络切换到2G或者3G网络的CS域,在所述UE移动到2G或者3G网络的CS域时,释放在2G或者3G网络的CS域预留的语音资源。

Description

一种节约语音资源的方法、 设备及系统 技术领域
本发明涉及通信技术领域,具体涉及一种节约语音资源的方法、设备及系 统。 全球移动通讯系统 ( 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。
用户设备(User Equipment, UE )在一次呼叫过程中, 可能会从 LTE网 络进入 2G或 3G网络, 由于 LTE网络与 2G或 3G网络的 载机制不同, 需 要从分组交换(Packet Switching, PS )域切换到电路交换( Circuit Switching, CS )域, 可能会出现语音呼叫的间断, 从而影响用户语音呼叫的连续性。
电路回退( Circuit Switched Fallback, CSFB)为 LTE覆盖下的用户设备( User Equipment, UE )在处理语音业务时, UE先回退到具有 CS域的网络, 在具有 CS域的网络处理语音业务, 这样就达到了重用现有的 CS域设备来为 LTE网络 中的用户提供传统的语音业务的目的。 现有技术需要 UE从 LTE网络切换到 2G 或 3G网络的 PS域或者从 LTE网络重定向到 2G或 3G网络,然后再在 2G或 3G网络 发起 CS域的连接。
现有技术中, CSFB过程中存在语音类 CSFB和非语音类 CSFB, 但现有 技术中在实现非语音类 CSFB业务过程中造成了语音资源浪费。
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节约语音资源的方法, 在实现非语音类 CSFB过程中, 不触发 UE从 LTE网络切换到 2G或者 3G网络的 CS域, 或者触发 UE从 LTE网络切换到 2G或者 3G网络的 CS域, 在所述 UE移动 到 2G或者 3G网络的 CS域时, 释放在 2G或者 3G网络的 CS域预留的语音资源。 本发明实施例还提供了相应的设备及系统。
本发明第一方面提供一种节约语音资源的方法, 包括:
移动管理实体 MME接收移动交换中心 MSC发送的用于寻呼用户设备 UE 的第一寻呼请求消息,所述第一寻呼请求消息包含第一指示信息,所述第一指 示信息用于指示非语音业务;
根据所述第一寻呼请求消息,所述 MME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不为所述非语音业务把所述 UE从长期演 进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域。
结合第一方面,在第一种可能的实现方式中,所述通知消息包含第二指示 信息, 所述第二指示信息用于指示所述非语音业务。
结合第一方面或第一方面第一种可能的实现方式,在第二种可能的实现方 式中, 所述方法还包括:
所述 MME向所述 UE发送第二寻呼请求消息;
所述 MME接收所述 UE发送的业务请求, 所述业务请求用于为电路域业务 请求电路回退 CSFB。
本发明第二方面提供一种节约语音资源的方法, 包括:
位于长期演进 LTE网络的演进基站 eNodeB接收移动管理实体 MME发送的 通知消息, 所述通知消息用于指示所述 eNodeB不为非语音业务将用户设备 UE 从所述 LTE网络切换到第二代 2G或第三代 3G网络的 CS域;
根据所述通知消息, 所述 eNodeB向所述 MME发送从所述 LTE网络到所述 2G或 3G网络的分组交换 PS域的切换要求消息, 或者
所述 eNodeB向所述 UE发送重定向请求。 结合第二方面, 在第一种可能的实现方式中, 所述通知消息包含第二指示 信息, 所述第二指示信息用于指示所述非语音业务。
本发明第三方面提供一种节约语音资源的方法, 包括: 移动交换中心 MSC接收移动管理实体 MME发送的第一切换请求消息, 所 述第一切换请求消息用于请求所述 MSC为电路域业务将用户设备 UE从长期演 进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域;
所述 MSC向所述 2G或 3G网络的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电路域业务分配语音资源;
所述 MSC接收所述基站发送的切换完成消息;
所述 MSC判断所述电路域业务是否为非语音业务;
当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向所述基站 发送承载释放消息以指示所述基站释放所述语音资源。
结合第三方面, 在第一种可能的实现方式中, 所述方法还包括: 所述 MSC接收所述 UE发送的业务连接建立请求消息, 所述业务连接建立 请求消息指示所述电路域业务为非语音业务;
所述 MSC判断所述电路域业务是否为非语音业务, 包括:
所述 MSC根据所述业务连接建立请求消息判断所述电路域业务为非语音 业务。
结合第三方面, 在第二种可能的实现方式中, 所述 MSC判断所述电路域 业务是否为非语音业务, 包括:
所述 MSC根据所述电路域业务的类型判断所述电路域业务为非语音业 务;
所述方法还包括:
所述 MSC向所述 UE发送业务连接建立请求消息, 所述业务连接建立请求 消息指示所述电路域业务为非语音业务。
结合第三方面、第三方面第一种或第二种可能的实现方式,在第三种可能 的实现方式中, 所述方法还包括:
当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向所述 UE发 送会话释放消息, 所述会话释放消息用于请求所述 UE释放在从所述 LTE网络 切换到所述 2G或 3G网络的 CS域过程中生成的语音会话。
本发明第四方面提供一种节约语音资源的方法, 包括: 位于长期演进 LTE网络的用户设备 UE向移动管理实体 MME发送请求消 息, 所述请求消息用于为电路域业务请求电路回退 CSFB;
所述 UE接收演进基站 eNodeB发送的切换命令, 所述切换命令用于指示所 述 UE为所述 CSFB从所述 LTE网络切换到第二代 2G或第三代 3G网络的电路交 到所述 2G或 3G网络的 CS域分配的语音资源的信息;
所述 UE向 2G或 3G网络的基站发送切换完成消息;
所述 UE接收所述基站发送的承载释放消息, 所述承载释放消息用于指示 所述基站释放了所述语音资源。
结合第四方面, 在第一种可能的实现方式中, 在所述 UE向所述 2G或 3G网 络的基站发送切换完成消息之后, 所述 UE接收所述基站发送的承载释放消息 之前, 所述方法还包括:
所述 UE向所述 MSC发送业务连接建立请求消息, 所述业务连接建立请求 消息指示所述电路域业务为非语音业务, 或者
所述 UE接收所述 MSC发送的业务连接建立请求消息, 所述业务连接建立 请求消息指示所述电路域业务为非语音业务。
结合第四方面或第四方面第一种可能的实现方式,在第二种可能的实现方 式中, 述方法还包括:
所述 UE接收所述 MSC发送的会话释放消息, 所述会话释放消息用于请求 所述 UE释放在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成的 语音会话。
本发明第五方面提供一种移动管理实体 MME, 包括:
接收单元, 用于接收移动交换中心 MSC发送的用于寻呼用户设备 UE的第 一寻呼请求消息,所述第一寻呼请求消息包含第一指示信息,所述第一指示信 息用于指示非语音业务;
发送单元, 用于根据所述接收单元接收的所述第一寻呼请求消息, 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不为所述非语 音业务把所述 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网络的电 路交换 CS域。
结合第五方面,在第一种可能的实现方式中,所述通知消息包含第二指示 信息,所述第二指示信息用于指示所述非语音业务。结合第五方面或第五方面 第一种可能的实现方式, 在第二种可能的实现方式中,
所述发送单元, 还用于向所述 UE发送第二寻呼请求消息;
所述接收单元, 还用于接收所述 UE发送的业务请求, 所述业务请求用于 为电路域业务请求电路回退 CSFB。
本发明第六方面提供一种演进基站 eNodeB , 包括:
接收单元, 用于接收移动管理实体 MME发送的通知消息, 所述通知消息 用于指示所述 eNodeB不为非语音业务将用户设备 UE从长期演进 LTE网络切换 到第二代 2G或第三代 3G网络的 CS域;
发送单元, 用于根据所述接收单元接收的所述通知消息, 向所述 MME发 送从所述 LTE网络到所述 2G或 3G网络的分组交换 PS域的切换要求消息,或者, 向所述 UE发送重定向请求。
结合第六方面, 在第一种可能的实现方式中, 所述通知消息包含第二指示 信息, 所述第二指示信息用于指示所述非语音业务。
本发明第七方面提供一种移动交换中心 MSC, 包括:
接收单元, 用于接收移动管理实体 MME发送的第一切换请求消息, 所述 第一切换请求消息用于请求所述 MSC为电路域业务将用户设备 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域;
发送单元, 用于向所述 2G或 3G网络的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电路域业务分配语音资源;
所述接收单元, 还用于接收所述基站发送的切换完成消息;
处理单元,用于在所述接收单元接收所述切换完成消息后,判断所述电路 域业务是否为非语音业务;
所述发送单元, 用于当所述处理单元判断所述电路域业务为非语音业务 时, 向所述基站发送承载释放消息以指示所述基站释放所述语音资源。
结合第七方面, 在第一种可能的实现方式中, 所述接收单元, 还用于接收所述 UE发送的业务连接建立请求消息, 所述 业务连接建立请求消息指示所述电路域业务为非语音业务;
所述处理单元,用于根据所述接收单元接收的所述业务连接建立请求消息 判断所述电路域业务为非语音业务。
结合第七方面, 在第二种可能的实现方式中,
所述处理单元,用于根据所述电路域业务的类型判断所述电路域业务为非 语音业务;
所述发送单元, 还用于向所述 UE发送业务连接建立请求消息, 所述业务 连接建立请求消息指示所述电路域业务为非语音业务。
结合第七方面、第七方面第一种或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,还用于当所述处理单元判断所述电路域业务为非语音业务 时, 向所述 UE发送会话释放消息, 所述会话释放消息用于请求所述 UE释放所 述 UE在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成的语音会 话。
本发明第八方面提供一种位于长期演进 LTE网络的用户设备 UE, 包括: 发送单元, 用于向移动管理实体 MME发送请求消息, 所述请求消息用于 为电路域业务请求电路回退 CSFB;
接收单元, 用于接收演进基站 eNodeB发送的切换命令, 所述切换命令用 于指示所述 UE为所述 CSFB从所述 LTE网络切换到第二代 2G或第三代 3G网络 的电路交换 CS域,所述切换命令中包含所述 2G或 3G网络为所述 UE从所述 LTE 网络切换到所述 2G或 3G网络的 CS域分配的语音资源的信息;
所述发送单元, 还用于向所述基站发送切换完成消息;
所述接收单元,还用于接收所述基站发送的承载释放消息, 所述承载释放 消息用于指示所述基站释放了所述语音资源。
结合第八方面, 在第一种可能的实现方式中,
所述发送单元, 还用于在向所述 2G或 3G网络的基站发送切换完成消息之 后, 所述接收单元接收所述基站发送的承载释放消息之前, 向所述 MSC发送 业务连接建立请求消息,所述业务连接建立请求消息指示所述电路域业务为非 语音业务, 或者
所述接收单元, 还用于在所述发送单元向所述基站发送切换完成消息之 后, 接收所述基站发送的承载释放消息之前, 接收所述 MSC发送的业务连接 建立请求消息, 所述业务连接建立请求消息指示所述电路域业务为非语音业 务。
结合第八方面或第八方面第一种可能的实现方式,在第二种可能的实现方 式中,
所述接收单元, 还用于接收所述 MSC发送的会话释放消息, 所述会话释 放消息用于请求所述 UE释放在从所述 LTE网络切换到所述 2G或 3G网络的 CS 域过程中生成的语音会话。
本发明第九方面提供一种节约语音资源的系统, 包括:
移动管理实体 MME、 移动交换中心 MSC、 演进基站 eNodeB;
所述 MME接收所述 MSC发送的用于寻呼用户设备 UE的第一寻呼请求消 息,所述第一寻呼请求消息包含第一指示信息,所述第一指示信息用于指示非 语音业务;
根据所述第一寻呼请求消息, 所述 MME向所述 eNodeB发送通知消息, 所 述通知消息用于指示所述 eNodeB不为所述非语音业务把所述 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网络的 CS域;
所述 eNodeB接收所述 MME发送的所述通知消息;
所述 eNodeB根据所述通知消息向所述 MME发送从所述 LTE网络到 2G或 3G网络的分组交换 PS域的切换要求消息, 或者
所述 eNodeB向所述 UE发送重定向请求。
本发明第十方面提供一种节约语音资源的系统,
移动管理实体 MME、 移动交换中心 MSC、 演进基站 eNodeB、 第二代 2G 或第三代 3G网络的基站;
位于长期演进 LTE网络的用户设备 UE向所述 MME发送请求消息, 所述请 求消息用于为电路域业务请求电路回退 CSFB; 所述 MSC接收所述 MME发送的第一切换请求消息, 所述第一切换请求消 息用于请求所述 MSC为电路域业务将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的电路交换 CS域;
所述 MSC向所述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电路域业务分配语音资源;
所述 UE接收所述 eNodeB发送的切换命令,所述切换命令用于指示所述 UE 为所述 CSFB从所述 LTE网络切换到所述 2G或 3G网络的电路交换 CS域,所述切 换命令中包含所述语音资源的信息;
所述 UE向所述基站发送切换完成消息;
所述 MSC接收所述基站发送的切换完成消息;
所述 MSC判断所述电路域业务是否为非语音业务;
当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向所述基站 发送承载释放消息以指示所述基站释放所述语音资源。
通过本发明提供的实施例, 在实现非语音类电路回退过程中不触发 UE从 LTE网络切换到 2G或者 3G网络的 CS域, 或者触发 UE从 LTE网络切换到 2G或者 3G网络的 CS域,在所述 UE移动到 2G或者 3G网络的 CS域时,释放在 2G或者 3G 网络的 CS域预留的语音资源, 从而节省了语音资源。
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是本发明实施例中节约语音资源的方法的一实施例示意图;
图 2 a是本发明实施例中节约语音资源的方法的另一实施例示意图; 图 2b是本发明实施例中节约语音资源的方法的另一实施例示意图; 图 3是本发明实施例中节约语音资源的方法的另一实施例示意图; 图 4是本发明实施例中节约语音资源的方法的另一实施例示意图; 图 5是本发明实施例中节约语音资源的方法的另一实施例示意图; 图 6是本发明实施例中节约语音资源的方法的另一实施例示意图; 图 7是本发明实施例中移动管理实体的一实施例示意图;
图 8是本发明实施例中演进基站的一实施例示意图;
图 9是本发明实施例中移动交换中心的一实施例示意图;
图 10是本发明实施例中用户设备的一实施例示意图;
图 11是本发明实施例中节约语音资源的系统的一实施例示意图。
具体实施方式
本发明实施例提供一种节约语音资源的方法, 在实现非语音类 CSFB过程 中, 不触发 UE从 LTE网络切换到 2G或者 3G网络的 CS域, 或者触发 UE从 LTE网 络切换到 2G或者 3G网络的 CS域, 在所述 UE移动到 2G或者 3G网络的 CS域时, 释放在 2G或者 3G网络的 CS域预留的语音资源。 本发明实施例还提供了相应的 设备及系统。 以下分别进行详细说明。
本发明实施例涉及到的部分通信名词的中英文对照及缩写包括:移动管理 实体(Mobile Managenment Entity, MME )、 演进基站 ( Envolved NodeB , eNodeB )、 用户设备 ( User Equipment, UE )、 移动交换中心( Mobile Services Switching Centre, MSC)、第二代或者第三代移动通信技术(2rd Generation/3rd Generation , 2G或 3G )、 基站( Base Station, BS )、 本发明实施例中的基站包 括基站控制器( Base Station Controller, BSC )和无线网络控制器( Radio Network Controller, RNC); 长期演进 (Long Term Evolution, LTE), 服务 GPRS支撑 节点 (Serving GPRS Support Node , SGSN ) , 电路回退(Circuit Switched Fallback, CSFB),陆地无线接入网( Terrestrial Radio Access Network, UTRAN)、 全球移动通讯系统( Global System of Mobile communication, GSM )、 增强型 数据速率 GSM演进技术(EnhancedDataRateforGSMEvolution, EDGE )全球移 动通讯系统 /增强型数据速率 GSM演进技术无线接入网络( GSM / EDGE Radio Access Network, GERAN )。
本发明实施例中的第一、 第二、 第三、 第四、 第五等仅用于区分不同的指 示信息、 消息或其他对象, 不代表顺序关系。
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例,本领域技术人员在没有作出创造性劳 动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
参阅图 1,图 1为本发明实施例中在非语音业务的电路回退网络切换中节约 语音资源的过程及切换后的主动呼叫过程:
S100、 UE向 MME发送扩展业务请求, 所述扩展业务请求用于请求电路回 退 CSFB。
S 100a、 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网络 进行判断。
所述通信网络是所述 LTE网络和所述 2G或 3G网络。
S 105、 MME根据所述扩展业务请求, 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为所述 CSFB将所述 UE从 LTE网络移动到 2G或 3G网络的 CS域, 也就是, 通知消息用于指示所述 eNodeB为所述 CSFB所 述 UE应当被移动到 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 络切换到 2G或 3G网络的 CS域, 以使 eNodeB发起为所述 CSFB将所述 UE从所述 LTE网络切换到 2G或 3G网络的 CS域的切换要求。
例如,可以在所述通知消息包含指示信息,使用所述指示信息指示所述通 3G网络的 CS域。
例如, 该指示信息可以为单一无线语音呼叫连续性( single radio voice call continuity , SRVCC )切换的指示信息, 用于指示所述 LTE网络和所述 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。 本发明实施例中的指示信息可以称为优化 CSFB指示(optimized CSFB indicator)、 基于单一无线语音呼叫连续性 ( single radio voice call continuity , SRVCC ) 的 CSFB指示(SRVCC based CSFB Indicator)、 增强的 CSFB指示 (enhanced CSFB indicator)或者增强 CSFB可能性指示 (enhanced CSFB possible) 或者 SRVCC操作可能性指示 (SRVCC Operation possible)。
S 110、 eNodeB向 MME发送切换要求消息。
所述切换要求消息可以为从所述 LTE网络到所述 2G或 3G网络的分组交换 PS域切换要求消息, (例如: LTE to 2G或 3G PS HO Required消息), 或从所述 LTE网络到所述 2G或 3G网络的所述 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网络的所述 PS域 和所述 CS域切换要求消息,(例如: LTE to 2 G或 3G SRVCC and PS HO Required 消息)。
所述切换要求消息可以包含 UE能力信息, 用于指示 UE所支持的频段信 息、接入能力等等。 例如, 该 UE能力信息可以是类标识 2(classmark2)和类标识 3(classmark3)中的至少一个。 现有技术中, 当 UE不支持 LTE网络到 2G或 3G网 络的 CS切换时, eNodeB不会将 UE的能力信息发给 MME, 因此 MME没有 UE 的能力信息。 但在 MME在获取到 UE的能力信息之后, MME可以将 UE的能力 信息发送给 MSC, 以便 MSC能执行到 2G或 3G CS切换。 在本发明实施例中, 通过切换请求消息可以将 UE能力信息传递给 MME。
所述切换要求消息包含第一指示信息, 所述第一指示信息用于请求所述
MME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, 所述第一指示信息用于请求所述 MME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, 并且指示所述 UE支持从所述 LTE 网络切换到所述 2G或 3G网络的 CS域;
或者,所述切换要求消息包含源到目标透明容器,所述源到目标透明容器 包含第二指示信息, 所述第二指示信息用于请求所述 2G或 3G网络的基站为所 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。
所述第一指示信息可以称为 CSFB指示、 优化 CSFB指示、 基于 SRVCC的 CSFB指示、 增强的 CSFB指示或者增强 CSFB可能性指示。
当第二指示信息没有指示所述 UE支持从所述 LTE网络切换到所述 2G或 3G网络的 CS域时, MME可以默认认为所述 UE支持。 当第一指示信息没有指 示所述 UE支持从所述 LTE网络切换到所述 2G或 3G网络的 CS域时, 所述 2G或 3G网络的基站可以默认认为所述 UE支持。 所述第二指示信息和所述第一指示 信息可以称为 CSFB指示、 优化 CSFB指示、 基于 SRVCC的 CSFB指示、 增强的 CSFB指示或者增强 CSFB可能性指示。
例如, 第二指示信息可以包含 CSFB指示字段, 或者 CSFB指示字段和 UE 能力字段。 CSFB指示字段指示所述 MME为所述 CSFB将 UE从所述 LTE网络切 换到所述 2G或 3G网络的电路交换 CS域。 UE能力字段表示所述 UE支持从所述 LTE网络切换到所述 2G或 3G网络的 PS域。
所述第一指示信息可以包含 CSFB指示字段, 或者 CSFB指示字段和 UE能 力字段。 CSFB指示字段指示所述 2G或 3G网络的基站为所述 CSFB将 UE从所述 LTE网络切换到所述 2G或 3G网络的电路交换 CS域。 UE能力字段表示所述 UE 支持从所述 LTE网络切换到所述 2G或 3G网络的 PS域。
例如:
a) 对于目标网络为 UTRAN网络, eNodeB在源 RNC到目标 RNC透明容 器 (source RNC to target RNC transparent container)包含所述第二指示 信息。 可以利用现有源 RNC到目标 RNC透明容器中的 CSFB信息 (CSFB information)字段作为 CSFB指示字段。 可以在源 RNC到目标
RNC透明容器中增加一个字段作为 UE能力字段。
b)对于目标网络为 GERAN网络, eNodeB在旧 BSS到新 BSS信息(old BSS to new BSS information)中包含所述第二指示信息。 可以在旧 BSS到新 BSS信息中增加 CSFB指示字段或 UE能力字段。
S115、 MME向 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为电路域业务将用户设备 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域。
因为该第一切换请求消息是 MME发给 MSC的, 因此该第一切换请求消息 要求的切换是从 LTE网络到 2G或 3G网络的 CS域的切换, 即该第一切换请求为 PS到 CS的切换请求。
所述第一切换请求消息可以携带第三指示信息, 所述第三指示信息用于请 CS域, 也就是说, 通过该第三指示信息表示该第一切换请求是为 CSFB而发送 的。 第三指示信息还可以指示所述 UE支持从所述 LTE网络切换到所述 2G或 3G 网络 CS域。 该第一切换请求消息也可以不指示 CSFB, 此时 MSC缺省认为第一 切换请求是为 CSFB而发送的。
当 MME从 eNodeB收到 UE的能力信息后,所述第一切换请求消息可以携带 UE能力信息, 例如, 该能力信息为类标识 classmark2和类标识 classmark3中的 至少一个。
因为 UE不支持 LTE网络到 2G或 3G网络 CS域的切换, UE不会上报其支持 的语音编解码信息, 此时 MME可以根据切换的目标系统, 在第一切换请求消 息携带默认语音编解码信息。
第一切换请求消息中的第三指示信息可以称为 CSFB指示、优化 CSFB指示
(optimized CSFB indicator), 基于单一无线语音呼叫连续性 ( single radio voice call continuity , SRVCC )的 CSFB指示 (SRVCC based CSFB Indicator), 增强的 CSFB指示(enhanced CSFB indicator)或者增强 CSFB可能性指示(enhanced CSFB possible) o
当所述第一切换请求消息中携带会话转移号码-单接收机( Session Transfer
Number-Single Radio, STN-SR ) 时, 所述 MSC忽略所述 STN-SR号码。
S120、 MME向 SGSN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 SGSN发起从所述 LTE网络到所述 2G或 3G网络的分组交换 PS域的切 换。
UE从 LTE网络切换到 CS域时, 可以同时切换到 PS域, 也可以不同时切换 到 PS域。 这样可以减少本方案对网络依赖度, 即只要求运营商支持 LTE到 2G 或 3G网络的 CS域切换即可,无需强制运营商支持 LTE到 2G或 3G网络的 PS域切 换。 S121、 MSC向基站( BSC/RNC )发送第三切换请求消息, 所述第三切换 请求消息用于请求所述基站为所述电路域业务分配语音资源。
所述第三切换请求消息还用于请求所述基站为 CSFB将用户设备 UE从长 期演进 LTE网络切换到所述 2G或 3G网络的电路交换 CS域。 基站为所述 UE从 LTE网络切换到所述 2G或 3G网络的 CS域分配 CS域资源。 例如,基站分配的 CS 语资源包括基站和 MSC之间的有线资源以及基站和 UE之间的无线资源。
例如,所述第三切换请求消息包含第五指示信息,所述第五指示信息用于 请求所述基站为所述 CSFB将所述 UE从所述 LTE网络切换到所述 CS域;
和 /或, 所述第五指示信息用于指示所述 UE支持所述 LTE网络到所述 2G或 3G网络的 CS域的切换。
所述第三切换请求消息包含源到目标透明容器,所述源到目标透明容器包 含所述第五指示信息。
当所述第一切换请求消息中未包含所述 UE支持的语音编解码信息时, 根 据所述 2G或 3G网络的类型, 所述 MSC设置默认的语音编解码信息;
其中, 所述默认的语音编解码信息可以包含在所述第三切换请求消息中。 所述第三切换请求消息包含完整性保护信息(Integrity Protection Information)和 /或力。密信息(Encryption Information), 以便基站在收到切换完成 消息后, 发送安全模式命令给 UE。
S125、 基站向 MSC发送第三切换请求响应消息, 所述第三切换请求响应 消息中包含所述 CS域无线资源的信息,所述 CS域无线资源的信息用于所述 UE 从所述 LTE网络切换到所述 2G或 3G网络的 CS域。
S130、 MSC向 MME发送第一切换响应消息, 所述第一切换响应消息中包 含所述 CS域无线资源的信息。
S135a、 MME向 eNodeB发送切换要求响应消息, 所述切换要求响应消息 中包含所述 CS域无线资源的信息。
S135b、 eNodeB向 UE发送切换命令, 所述切换命令中包含所述 CS域无线 资源的信息。
所述 UE接收演进基站 eNodeB发送的切换命令, 所述切换命令用于指示所 述 UE为所述 CSFB从所述 LTE网络切换到 2G或 3G网络的电路交换 CS域, 所述
3 G网络的 C S域分配的语音资源的信息。
例如: 所述切换命令包含第四指示信息,所述第四指示信息用于指示所述 UE为所述 CSFB从所述 LTE网络切换到所述 2G或 3G网络的 CS域。
例如: 所述切换命令中还包含 PS域资源的信息, 根据所述 PS域资源的信 息, 所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 PS域。
所述切换命令还可以用于指示所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 PS域。
S140、 UE根据切换命令, 从所述 LTE网络切换到所述 2G或 3G网络的 CS 域。
UE使用切换命令中包含的资源的信息, 为所述 CSFB从所述 LTE网络切换 到所述 2G或 3G网络的 CS域。
UE在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成会话。 UE在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中也可以不生成会 话。
当所述资源的信息包含 CS加密算法标识时,所述 UE根据所述 CS加密算法 标识,在从所述 LTE网络切换到所述 2G网络或 3G网络的过程中激活 CS域加密。
S145、 UE切换完成后, 向基站 (BSC或者 RNC ) 发送切换完成 ( HO Complete ) 消息。
基站收到切换完成消息后, 为响应该切换完成消息, 需要在向 UE发送的 UTRAN移动性信息(UTRAN Mobility Information)中携带位置区域标识 (Location Area Identity, LAI) , 在本实施例中可能会导致 UE发起位置更新 ( Location Area Update, LAU ), 从而导致 CS呼叫建立失败。 为避免失败, 基 站在向 UE发送的该 UTRAN移动性信息中可以不携带位置区域标识。
基站可以在后续过程发送 UTRAN移动性信息时, 将 LAI发送给 UE, 例如 可以釆用以下方法:
a)基站在收到切换完成消息后, 启动定时器, 等定时器超时后, 基站 发送 UTRAN移动性信息, 将 LAI发送给 UE。 或者,
b)基站在收到呼叫 IU释放指令( IU RELEASE COMMAND )或者呼叫 连接接通 (Connect)消息时, 发送 UTRAN移动性信息, 将 LAI发送给 UE。 其中 对于主叫, MSC发送呼叫连接接通 (Connect)消息给 UE; 对于被叫, UE发送呼 叫连接接通 (Connect)消息给 MSC。
或者, 当 UE发送 LAU消息给基站时, 为避免失败, 基站不向所述 MSC发 送位置更新请求消息, 基站直接发送位置更新接受消息给所述 UE。
S150、 基站将步骤 S145中的切换完成消息转发给 MSC。
MSC接收所述基站发送的切换完成消息后, 判断所述电路域业务是否为 非语音业务, 当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向 所述基站发送承载释放消息以指示所述基站释放所述语音资源。
具体的判断过程和释放语音资源的过程可以参阅 S155~S196b进行理解。 S155、 UE向 MSC发送连接管理业务请求, 比如 CM Serivce Request消息。 S160、 MSC向 UE发送鉴权请求 (Authenticate Request)。
本步骤 S160也可以不执行, 即: 所述 MSC不向所述 UE发送鉴权请求消息。
S165、 UE向 MSC发送鉴权响应 (Authenticate Response)。
S170、 MSC向基站发送安全模式命令 (Security mode command), 携带完整 性保护信息 (Integrity Protection Information)和 /或力口密信息 (Encryption Information), 以便基站发送安全模式命令给 UE。
本步骤 S170也可以不执行, 即: 所述 MSC不向所述基站发送安全模式命 令。
S175、 基站发送安全模式命令给 UE。 具体说来, 基站根据步骤 S170中的 安全模式命令, 执行本步骤, 或者基站在接收到 S145消息后, 执行本步骤。
S180、 可选地, MSC向 UE发送连接管理业务接受命令。
S185、 UE向 MSC发送业务连接建立请求消息, 所述业务连接建立请求消 息用于请求所述 MSC为所述 CSFB建立非语音业务, 比如定位业务(Location Service, LCS)或者非结构化补充数据业务 ( Unstructured Supplementary Service Data , USSD )。 可选地, 还可以是所述 UE接收所述 MSC发送的业务连接建立请求消息, 所述业务连接建立请求消息指示所述电路域业务为非语音业务。
可选地, 所述 MSC接收所述 UE发送的业务连接建立请求消息, 所述业务 连接建立请求消息指示所述电路域业务为非语音业务;
所述 MSC判断所述电路域业务是否为非语音业务, 可以包括:
所述 MSC根据所述业务连接建立请求消息判断所述电路域业务为非语音 业务。
可选地, 所述 MSC判断所述电路域业务是否为非语音业务, 可以包括: 所述 MSC根据所述电路域业务的类型判断所述电路域业务为非语音业 务;
所述方法还可以包括:
所述 MSC向所述 UE发送业务连接建立请求消息, 所述业务连接建立请求 消息指示所述电路域业务为非语音业务。
S190、 MSC接收到所述业务连接建立请求或者连接管理业务请求后, 所 述 MSC向 UE发送会话释放消息(比如 Disconnect消息), 所述会话释放消息用于 请求所述 UE释放所述 UE在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过 程中生成的会话。
所述 UE接收所述 MSC发送的会话释放消息, 所述会话释放消息用于请求 所述 UE释放所述 UE在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中 生成的语音会话。
所述 UE接收所述 MSC发送的会话释放消息之后,所述 UE发送会话释放请 求消息(比如 Release消息)。
所述 MSC收到所述会话释放请求消息之后, 发送会话释放请求完成 消息 (比如 Release complete消息)。
可选地, 当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向 所述 UE发送会话释放消息, 所述会话释放消息用于请求所述 UE释放所述 UE 在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成的语音会话。
S196a、 MSC发送承载释放消息给所述 2G或 3G网络的基站( BSC/RNC ) , 以便基站释放在步骤 S121所述基站为所述 UE切换到所述 2G或 3G网络的 CS域 分配的 CS域的语音资源。
S196b、 所述 2G或 3G网络的基站发送承载释放消息给所述 UE, 以便 UE释 放所述基站为所述 UE切换到所述 2G或 3G网络的 CS域分配的 CS域的语音资 源。
进一步, 被叫摘机, 进入通话状态。
当呼叫结束后, 由于该呼叫是由 CSFB触发的, UE完成呼叫后需要回到
LTE网络。 基站根据第三切换请求消息, 确定该呼叫是由 CSFB触发的, 所述
2G或 3G网络的基站在接收到所述 MSC发送的呼叫释放消息后, 所述 2G或 3G 网络的基站将所述 UE重定向到所述 LTE网络, 或者, 所述基站将所述 UE切换 到所述 LTE网络, 所述呼叫释放消息为释放命令 Iu Release Command或清除命 令 Clear Command。
需要说明的是, 本实施例中, 基站可以解析 UE和 MSC之间的 CS信令。 基 站接收 UE发送给 MSC的信令消息, 例如连接管理业务请求、 鉴权响应、 第一 CS呼叫连接建立请求消息等信令消息。 基站可以使用在 LTE网络到 2G或 3G网 络的 CS域的切换过程中建立的连接将该信令消息发送给 MSC, 或者使用直传 消息将该信令消息发送给 MSC。
本实施例中,通知消息中包含的指示信息、第一指示信息、第二指示信息、 第三指示信息、 第四指示信息、 第五指示信息可以包含 CSFB指示字段, 或者 CSFB指示字段和 UE能力字段。 CSFB指示字段指示所述 MME或所述 MSC或所 述 2/3G网络基站为所述 CSFB将 UE从所述 LTE网络切换到所述 2G或 3G网络的 电路交换 CS域。 UE能力字段表示所述 UE支持从所述 LTE网络切换到所述 2G或
3G网络的 PS域。
在图 1中,在实现非语音类电路回退过程中触发 UE从 LTE网络切换到 2G或 者 3G网络的 CS域, 在所述 UE移动到 2G或者 3G网络的 CS域时, 释放在 2G或者 3G网络的 CS域预留的语音资源, 从而节省了语音资源。
参阅图 2a,图 2a为本发明实施例中非语音业务的电路回退网络切换中节约 语音资源的过程及切换后被动呼叫过程: SOb-SOc: MSC发送 CS寻呼请求给 MME, MME触发寻呼过程。 可选地, MSC发送寻呼消息给 MME, 所述寻呼消息指示本次业务为非语 音业务, 比如 USSD或者 LCS业务。
S200和 S200a与 S100和 SlOOa相同, 在此不再赘述。
S205、 MME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不为所述非语音业务把所述 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网络的 CS域。
S210、 所述 eNodeB向所述 MME发送切换要求消息, 所述切换要求消息用 于请求将所述 UE从 LTE网络移动到 2G或 3G网络的 PS域或者所述 eNodeB通过 重定向流程将所述 UE移动到所述 2G或 3G网络。
所述 eNodeB不使用从 LTE网络移动到 2G或 3G网络的 CS域的切换过程将所 述 UE移动到所述 2G或 3G网络, 而使用从 LTE网络移动到 2G或 3G网络的 PS域 的切换或者重定向流程将所述 UE移动到所述 2G或 3G网络。
在图 2a中, 在实现非语音类电路回退过程中不触发 UE从 LTE网络切换到 2G或者 3G网络的 CS域, 从而节省了语音资源。
参阅图 2b,图 2b为本发明实施例中非语音业务的电路回退网络切换中节约 语音资源的过程及切换后的被动呼叫过程:
S0b-S0c: MSC发送 CS寻呼请求给 MME, MME触发寻呼过程。
可选地, MSC发送寻呼消息给 MME, 所述寻呼消息指示本次业务为非语 音业务, 比如 USSD或者 LCS业务。
步骤 S200-S250和图 1中的步骤 S100-S150相同, 在此不再赘述。
S255、 可选地, UE向 MSC发送寻呼响应。
S260、 MSC向 UE发送鉴权请求。
本步骤 S260也可以不执行, 即: 所述 MSC不向所述 UE发送鉴权请求消息。 S265、 UE向 MSC发送鉴权响应。
S270、 MSC向基站发送安全模式命令, 携带完整性保护信息 (Integrity Protection Information)和 /或力口密信息 (Encryption Information) ,以便基站发送安 全模式命令给 UE。
本步骤 S270也可以不执行, 即: 所述 MSC不向所述基站发送安全模式命 令。
S275、 基站发送安全模式命令给 UE。 具体说来, 基站根据步骤 S270中的 安全模式命令, 执行本步骤, 或者基站在接收到 S245消息后, 执行本步骤。
S280、 MSC向 UE发送业务连接建立请求消息, 所述业务连接建立请求消 息用于请求所述 MSC为所述 CSFB建立非语音业务,比如定位业务( Location Service , LCS ) 或者非结构化补充数据业务 ( Unstructured Supplementary Service Data , USSD )。
可选地, 还可以是所述 UE接收所述 MSC发送的业务连接建立请求消息, 所述业务连接建立请求消息指示所述电路域业务为非语音业务。
可选地, 所述 MSC接收所述 UE发送的业务连接建立请求消息, 所述业务 连接建立请求消息指示所述电路域业务为非语音业务;
所述 MSC判断所述电路域业务是否为非语音业务, 可以包括:
所述 MSC根据所述业务连接建立请求消息判断所述电路域业务为非语音 业务。
可选地, 所述 MSC判断所述电路域业务是否为非语音业务, 可以包括: 所述 MSC根据所述电路域业务的类型判断所述电路域业务为非语音业 务;
所述方法还可以包括:
所述 MSC向所述 UE发送业务连接建立请求消息, 所述业务连接建立请求 消息指示所述电路域业务为非语音业务。
S290、 所述 MSC在收到切换完成消息或者所述 MSC在发送业务连接建立 请求消息之后, 所述 MSC向 UE发送会话释放消息(比如 Disconnect消息), 所述 会话释放消息用于请求所述 UE释放所述 UE在从所述 LTE网络切换到所述 2G 或 3G网络的 CS域过程中生成的会话。
所述 UE接收所述 MSC发送的会话释放消息, 所述会话释放消息用于请求 所述 UE释放所述 UE在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中 生成的语音会话。
所述 UE接收所述 MSC发送的会话释放消息之后,所述 UE发送会话释放请 求消息(比如 Release消息)。
所述 MSC收到所述会话释放请求消息之后, 发送会话释放请求完成 消息 (比如 Release complete消息)。
S296, MSC发送承载释放消息给 BSC/RNC, 以便释放在步骤 S221所述基 站为所述 UE切换到所述 2G或 3G网络的 CS域分配 CS域语音资源。
所述 2G或 3G网络的基站发送承载释放消息给所述 UE, 释放所述基站为 所述 UE切换到所述 2G或 3G网络的 CS域分配 CS域语音资源。
当呼叫结束后, 由于该呼叫是由 CSFB触发的, UE完成呼叫后需要回到
LTE网络。 基站根据第三切换请求消息, 确定该呼叫是由 CSFB触发的, 因此, 所述 2G或 3G网络的基站在接收到所述 MSC发送的呼叫释放消息后, 所述 2/3G 网络的基站将所述 UE重定向到所述 LTE网络, 或者, 所述基站将所述 UE切换 到所述 LTE网络,所述呼叫释放消息为释放命令 Iu Release Command或清除命 令 Clear Command。
需要说明的是, 本实施例中, 基站可以解析 UE和 MSC之间的 CS信令。 基 站接收 UE发送给 MSC的信令消息, 例如呼叫确认消息、 鉴权响应、 第二 CS呼 叫连接建立请求消息等信令消息。 基站可以使用在 LTE网络到 2G或 3G网络的 CS域的切换过程中建立的连接将该信令消息发送给 MSC, 或者使用直传消息 将该信令消息发送给 MSC。
本实施例中,通知消息中包含的指示信息、第二指示信息、第三指示信息、 第四指示信息、 第五指示信息可以包含 CSFB指示字段, 或者 CSFB指示字段和 UE能力字段。 CSFB指示字段指示所述 MME为所述 CSFB将 UE从所述 LTE网络 切换到所述 2G或 3G网络的电路交换 CS域。 UE能力字段表示所述 UE支持从所 述 LTE网络切换到所述 2G或 3G网络的 PS域。
在实现非语音类 CSFB过程中,不触发 UE从 LTE网络切换到 2G或者 3G网络 的 CS域, 或者触发 UE从 LTE网络切换到 2G或者 3G网络的 CS域, 在所述 UE移 动到 2G或者 3G网络的 CS域时, 释放在 2G或者 3G网络的 CS域预留语音资源, 从而节省宝贵语音资源。
以上两个应用场景中分别从 UE主叫和 UE被叫的两个方面描述了整个网 络切换和会话的过程。
参阅图 3, 本发明实施例提供的节约语音资源的方法的一个实施例包括: 101、移动管理实体 MME接收移动交换中心 MSC发送的用于寻呼用户设备
UE的第一寻呼请求消息, 所述第一寻呼请求消息包含第一指示信息, 所述第 一指示信息用于指示非语音业务。
102、 根据所述第一寻呼请求消息, 所述 MME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不为所述非语音业务把所述 UE从 长期演进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域。
图 3所示的方法还包括:
所述 MME向所述 UE发送第二寻呼请求消息;
所述 MME接收所述 UE发送的业务请求, 所述业务请求用于为电路域业务 请求电路回退 CSFB。
本实施例中 MME的上述处理步骤以及其他处理步骤的详细描述, 可以参 见图 2a所对应的实施例中的描述, 此处不再赘述。
参阅图 4, 本发明实施例提供的节约语音资源的方法的另一实施例包括: 201、 位于长期演进 LTE网络的演进基站 eNodeB接收移动管理实体 MME 发送的通知消息, 所述通知消息用于指示所述 eNodeB不为非语音业务将用户 设备 UE从所述 LTE网络切换到第二代 2G或第三代 3G网络的 CS域。
202、 根据所述通知消息, 所述 eNodeB向所述 MME发送从所述 LTE网络到 所述 2G或 3G网络的分组交换 PS域的切换要求消息, 或者, 所述 eNodeB向所述 UE发送重定向请求。
本实施例中演进基站的上述处理步骤以及其他处理步骤的详细描述,可以 参见图 2a所对应的实施例中的描述, 此处不再赘述。
参阅图 5, 本发明实施例提供的节约语音资源的方法的另一实施例包括: 301、 移动交换中心 MSC接收移动管理实体 MME发送的第一切换请求消 息, 所述第一切换请求消息用于请求所述 MSC为电路域业务将用户设备 UE从 长期演进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域。
302、 所述 MSC向 2G或 3G网络的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电路域业务分配语音资源。
303、 所述 MSC接收所述基站发送的切换完成消息。
304、 所述 MSC接收所述基站发送的切换完成消息。
305、 当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向所述 基站发送承载释放消息以指示所述基站释放所述语音资源。
图 5所示的方法还包括:
所述 MSC接收所述 UE发送的业务连接建立请求消息, 所述业务连接建立 请求消息指示所述电路域业务为非语音业务;
所述 MSC判断所述电路域业务是否为非语音业务, 包括:
所述 MSC根据所述业务连接建立请求消息判断所述电路域业务为非语音 业务。
所述 MSC判断所述电路域业务是否为非语音业务, 包括:
所述 MSC根据所述电路域业务的类型判断所述电路域业务为非语音业 务;
所述方法还包括:
所述 MSC向所述 UE发送业务连接建立请求消息, 所述业务连接建立请求 消息指示所述电路域业务为非语音业务。
当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向所述 UE发 送会话释放消息, 所述会话释放消息用于请求所述 UE释放在从所述 LTE网络 切换到所述 2G或 3G网络的 CS域过程中生成的语音会话。
本实施例中 UE的上述处理步骤以及其他处理步骤的详细描述, 可以参见 图 1和图 2b所对应的实施例中的描述, 此处不再赘述。
参阅图 6, 本发明实施例提供的节约语音资源的方法的另一实施例包括:
401、位于长期演进 LTE网络的用户设备 UE向移动管理实体 MME发送请求 消息, 所述请求消息用于为电路域业务请求电路回退 CSFB。
402、 所述 UE接收演进基站 eNodeB发送的切换命令, 所述切换命令用于 指示所述 UE为所述 CSFB从所述 LTE网络切换到第二代 2G或第三代 3G网络的 电路交换 CS域, 所述切换命令中包含所述 2G或 3G网络为所述 UE从所述 LTE网 络切换到所述 2G或 3G网络的 CS域分配的语音资源的信息。
403、 所述 UE向 G或 3G网络的基站发送切换完成消息。
404、 所述 UE接收所述基站发送的承载释放消息, 所述承载释放消息用于 指示所述基站释放了所述语音资源。
图 6所示的方法还可以包括:
在所述 UE向所述基站发送切换完成消息之后, 所述 UE接收所述基站发送 的承载释放消息之前,
所述 UE向所述 MSC发送业务连接建立请求消息, 所述业务连接建立请求 消息指示所述电路域业务为非语音业务, 或者
所述 UE接收所述 MSC发送的业务连接建立请求消息, 所述业务连接建立 请求消息指示所述电路域业务为非语音业务。
所述 UE接收所述 MSC发送的会话释放消息, 所述会话释放消息用于请求 所述 UE释放在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成的 语音会话。
本实施例中 UE的上述处理步骤以及其他处理步骤的详细描述, 可以参见 图 1和图 2b所对应的实施例中的描述, 此处不再赘述。 参阅图 7, 本发明实施例提供的移动管理实体 MME60包括: 接收单元 601 和发送单元 602。
接收单元 601, 用于接收移动交换中心 MSC发送的用于寻呼用户设备 UE 的第一寻呼请求消息,所述第一寻呼请求消息包含第一指示信息,所述第一指 示信息用于指示非语音业务。
发送单元 602, 用于根据所述接收单元 601接收的所述第一寻呼请求消息, 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不为所 述非语音业务把所述 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网 络的电路交换 CS域。 所述发送单元 602, 还用于向所述 UE发送第二寻呼请求消息; 所述接收单元 601, 还用于接收所述 UE发送的业务请求, 所述业务请求用 于为电路域业务请求电路回退 CSFB。
所述通知消息包含第二指示信息,所述第二指示信息用于指示所述非语音 业务。
本实施例中的移动管理实体可以执行图 2a和图 3方法实施例中描述的 MME的方法步骤, 接收单元 601用于接收其他实体发送到 MME的消息, 发送 单元 602用于向其他实体发送消息。 本领域技术人员可根据这些方法实施例中 参阅图 8,本发明实施例提供的演进基站 70包括:接收单元 701和发送单元
702,
接收单元 701, 用于接收移动管理实体 MME发送的通知消息, 所述通知消 息用于指示所述 eNodeB不为非语音业务将用户设备 UE从长期演进 LTE网络切 换到第二代 2G或第三代 3G网络的 CS域。
发送单元 702, 用于根据所述接收单元接收的所述通知消息, 向所述 MME 发送从所述 LTE网络到所述 2G或 3G网络的分组交换 PS域的切换要求消息, 或 者, 向所述 UE发送重定向请求。
所述通知消息包含第二指示信息, 所述第二指示信息用于指示所述非语音 业务。
本实施例中的演进基站可以执行图 2a和图 4方法实施例中描述的演进基站 的方法步骤, 接收单元 701用于接收其他实体发送到演进基站的消息。 本领域 技术人员可根据这些方法实施例中的执行步骤,理解演进基站中各单元的行为 和执行的动作以及各单元之间的关系。
参阅图 9, 本发明实施例提供的移动交换中心 MSC80包括: 接收单元 801、 发送单元 802和处理单元 803。
接收单元 801, 用于接收移动管理实体 MME发送的第一切换请求消息, 所 述第一切换请求消息用于请求所述 MSC为电路域业务将用户设备 UE从长期演 进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域。 发送单元 802,用于向所述 2G或 3G网络的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电路域业务分配语音资源; 所述接收单元 801, 还用于接收所述基站发送的切换完成消息;
处理单元 803,用于在所述接收单元 801接收所述切换完成消息后,判断所 述电路域业务是否为非语音业务;
所述发送单元 802,用于当所述处理单元 803判断所述电路域业务为非语音 业务时, 向所述基站发送承载释放消息以指示所述基站释放所述语音资源。
所述接收单元 801, 还用于接收所述 UE发送的业务连接建立请求消息, 所 述业务连接建立请求消息指示所述电路域业务为非语音业务;
所述处理单元 802,用于根据所述接收单元 801接收的所述业务连接建立请 求消息判断所述电路域业务为非语音业务。
所述处理单元 803, 用于根据所述电路域业务的类型判断所述电路域业务 为非语音业务;
所述发送单元 802, 还用于向所述 UE发送业务连接建立请求消息, 所述业 务连接建立请求消息指示所述电路域业务为非语音业务。
所述发送单元 802,还用于当所述处理单元 803判断所述电路域业务为非语 音业务时, 向所述 UE发送会话释放消息, 所述会话释放消息用于请求所述 UE 释放所述 UE在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成的 语音会话。
本实施例中的 MSC可以执行图 1、 图 2b和图 5方法实施例中描述的 MSC的 方法步骤, 接收单元 801用于接收其他实体发送到 MSC的消息, 发送单元 803
参阅图 10, 本发明实施例提供的用户设备 90包括: 发送单元 901和接收单 元 902。
发送单元 901, 用于向移动管理实体 MME发送请求消息, 所述请求消息用 于为电路域业务请求电路回退 CSFB。
接收单元 902, 用于接收演进基站 eNodeB发送的切换命令, 所述切换命令 用于指示所述 UE为所述 CSFB从所述 LTE网络切换到第二代 2G或第三代 3G网 络的电路交换 CS域, 所述切换命令中包含所述 2G或 3G网络为所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域分配的语音资源的信息。
所述发送单元 901, 还用于向 2G或 3G网络的基站发送切换完成消息; 所述接收单元 902, 还用于接收所述基站发送的承载释放消息, 所述承载 释放消息用于指示所述基站释放了所述语音资源。
所述发送单元 901, 还用于在向所述基站发送切换完成消息之后, 所述接 收单元接收 2G或 3G网络的基站发送的承载释放消息之前, 向所述 MSC发送业 务连接建立请求消息,所述业务连接建立请求消息指示所述电路域业务为非语 音业务, 或者
所述接收单元 902,还用于在所述发送单元 901向所述基站发送切换完成消 息之后, 接收所述基站发送的承载释放消息之前, 接收所述 MSC发送的业务 连接建立请求消息,所述业务连接建立请求消息指示所述电路域业务为非语音 业务。
所述接收单元 902, 还用于接收所述 MSC发送的会话释放消息, 所述会话 释放消息用于请求所述 UE释放在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成的语音会话。
本实施例中的 UE可以执行图 1、 图 2b或图 6方法实施例中描述的 UE的方法 步骤, 接收单元 902用于接收其他实体发送到 UE的消息, 发送单元 901用于向
通过本发明提供的上述装置实施例,在实现非语音类电路回退过程中不触 发 UE从 LTE网络切换到 2G或者 3G网络的 CS域,或者触发 UE从 LTE网络切换到 2G或者 3G网络的 CS域, 在所述 UE移动到 2G或者 3G网络的 CS域时,释放在 2G 或者 3G网络的 CS域预留的语音资源, 从而节省了语音资源。
本领域技术人员能够理解, 上述图 7 - 10的实施例中, 用于发送消息的发 送单元可以釆用发送器实现, 用于接收消息的接收单元可以釆用接收器实现。 或者, 发送单元和接收单元都可以釆用收发器实现。 在物理实现上, 发送器或 者收发器可以用一个物理实体实现,也可釆用多个物理实体实现,发送器和收 发器可以釆用一个物理实体实现,也可以釆用多个物理实体实现,本发明对此 不做限制。 1处理单元 1单元可以釆用一个或多个处理器实现,本发明对此不做 限制。
参阅图 11,本发明实施例提供的网络切换系统的一实施例包括: 移动管理 实体 60、 演进基站 70、 移动交换中心 80、 基站 100和用户设备 90;
移动管理实体 60、 演进基站 70、 移动交换中心 80、 基站 100和用户设备 90 各自执行的动作以及它们之间的交互, 可以参见图 2a的描述, 以及图 3、 图 4、 图 7、 图 8的方法实施例和装置实施例的描述, 此处不再赘述。
或者, 移动管理实体 60、 演进基站 70、 移动交换中心 80、 基站 100和用户 设备 90各自执行的动作以及它们之间的交互, 可以参见图 1、 图 2b的描述, 以 及图 5、 图 6、 图 9、 图 10的方法实施例和装置实施例的描述, 此处不再赘述。 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 述的系统、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, 所揭露的系统、 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系统,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、装置或单元的间接辆合或通信连接,也 可以是电的, 机械的或其它的形式连接。
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。 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釆用硬件的形式实现,也可以釆用软件功能单元 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。 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

权 利 要 求
1、 一种节约语音资源的方法, 其特征在于, 包括:
移动管理实体 MME接收移动交换中心 MSC发送的用于寻呼用户设备 UE 的第一寻呼请求消息,所述第一寻呼请求消息包含第一指示信息,所述第一指 示信息用于指示非语音业务;
根据所述第一寻呼请求消息,所述 MME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不为所述非语音业务把所述 UE从长期演 进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域。
2、根据权利要求 1所述的方法, 其特征在于, 所述通知消息包含第二指示 信息, 所述第二指示信息用于指示所述非语音业务。
3、 根据权利要求 1或 2所述的方法, 其特征在于, 所述方法还包括: 所述 MME向所述 UE发送第二寻呼请求消息;
所述 MME接收所述 UE发送的业务请求, 所述业务请求用于为电路域业务 请求电路回退 CSFB。
4、 一种节约语音资源的方法, 其特征在于, 包括:
位于长期演进 LTE网络的演进基站 eNodeB接收移动管理实体 MME发送的 通知消息, 所述通知消息用于指示所述 eNodeB不为非语音业务将用户设备 UE 从所述 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域;
根据所述通知消息, 所述 eNodeB向所述 MME发送从所述 LTE网络到所述 2G或 3G网络的分组交换 PS域的切换要求消息, 或者所述 eNodeB向所述 UE发 送重定向请求。
5、 根据权利要求 4所述的方法, 所述通知消息包含第二指示信息, 所述第 二指示信息用于指示所述非语音业务。
6、 一种节约语音资源的方法, 其特征在于, 包括:
移动交换中心 MSC接收移动管理实体 MME发送的第一切换请求消息, 所 述第一切换请求消息用于请求所述 MSC为电路域业务将用户设备 UE从长期演 进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域;
所述 MSC向所述 2G或 3G网络的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电路域业务分配语音资源;
所述 MSC接收所述基站发送的切换完成消息;
所述 MSC判断所述电路域业务是否为非语音业务;
当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向所述基站 发送承载释放消息以指示所述基站释放所述语音资源。
7、 根据权利要求 6所述的方法, 其特征在于, 所述方法还包括: 所述 MSC接收所述 UE发送的业务连接建立请求消息, 所述业务连接建立 请求消息指示所述电路域业务为非语音业务;
所述 MSC判断所述电路域业务是否为非语音业务, 包括:
所述 MSC根据所述业务连接建立请求消息判断所述电路域业务为非语音 业务。
8、 根据权利要求 6所述的方法, 其特征在于, 所述 MSC判断所述电路域 业务是否为非语音业务, 包括:
所述 MSC根据所述电路域业务的类型判断所述电路域业务为非语音业 务;
所述方法还包括:
所述 MSC向所述 UE发送业务连接建立请求消息, 所述业务连接建立请求 消息指示所述电路域业务为非语音业务。
9、 根据权利要求 6 - 8任一所述的方法, 其特征在于, 所述方法还包括: 当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向所述 UE发 送会话释放消息, 所述会话释放消息用于请求所述 UE释放在从所述 LTE网络 切换到所述 2G或 3G网络的 CS域过程中生成的语音会话。
10、 一种节约语音资源的方法, 其特征在于, 包括:
位于长期演进 LTE网络的用户设备 UE向移动管理实体 MME发送请求消 息, 所述请求消息用于为电路域业务请求电路回退 CSFB;
所述 UE接收演进基站 eNodeB发送的切换命令, 所述切换命令用于指示所 述 UE为所述 CSFB从所述 LTE网络切换到第二代 2G或第三代 3G网络的电路交 到所述 2G或 3G网络的 CS域分配的语音资源的信息;
所述 UE向 2G或 3G网络的基站发送切换完成消息;
所述 UE接收所述基站发送的承载释放消息, 所述承载释放消息用于指示 所述基站释放了所述语音资源。
11、 根据权利要求 10所述的方法, 其特征在于, 在所述 UE向所述 2G或 3G 网络的基站发送切换完成消息之后, 所述 UE接收所述基站发送的承载释放消 息之前, 所述方法还包括:
所述 UE向所述 MSC发送业务连接建立请求消息, 所述业务连接建立请求 消息指示所述电路域业务为非语音业务, 或者
所述 UE接收所述 MSC发送的业务连接建立请求消息, 所述业务连接建立 请求消息指示所述电路域业务为非语音业务。
12、 根据权利要求 10或 11所述的方法, 其特征在于, 所述方法还包括: 所述 UE接收所述 MSC发送的会话释放消息, 所述会话释放消息用于请求 所述 UE释放在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成的 语音会话。
13、 一种移动管理实体 MME, 其特征在于, 包括:
接收单元, 用于接收移动交换中心 MSC发送的用于寻呼用户设备 UE的第 一寻呼请求消息,所述第一寻呼请求消息包含第一指示信息,所述第一指示信 息用于指示非语音业务;
发送单元, 用于根据所述接收单元接收的所述第一寻呼请求消息, 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不为所述非语 音业务把所述 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网络的电 路交换 CS域。
14、 根据权利要求 13所述的 MME, 其特征在于, 所述通知消息包含第二 指示信息, 所述第二指示信息用于指示所述非语音业务。
15、 根据权利要求 13或 14所述的 MME, 其特征在于,
所述发送单元, 还用于向所述 UE发送第二寻呼请求消息;
所述接收单元, 还用于接收所述 UE发送的业务请求, 所述业务请求用于 为电路域业务请求电路回退 CSFB。
16、 一种演进基站 eNodeB , 其特征在于, 包括:
接收单元, 用于接收移动管理实体 MME发送的通知消息, 所述通知消息 用于指示所述 eNodeB不为非语音业务将用户设备 UE从长期演进 LTE网络切换 到第二代 2G或第三代 3G网络的 CS域;
发送单元, 用于根据所述接收单元接收的所述通知消息, 向所述 MME发 送从所述 LTE网络到所述 2G或 3G网络的分组交换 PS域的切换要求消息,或者, 向所述 UE发送重定向请求。
17、根据权利要求 16所述的 eNodeB , 其特征在于, 所述通知消息包含第二 指示信息, 所述第二指示信息用于指示所述非语音业务。
18、 一种移动交换中心 MSC, 其特征在于, 包括: 接收单元, 用于接收移动管理实体 MME发送的第一切换请求消息, 所述 第一切换请求消息用于请求所述 MSC为电路域业务将用户设备 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网络的电路交换 CS域;
发送单元, 用于向所述 2G或 3G网络的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电路域业务分配语音资源;
所述接收单元, 还用于接收所述基站发送的切换完成消息;
处理单元,用于在所述接收单元接收所述切换完成消息后,判断所述电路 域业务是否为非语音业务;
所述发送单元, 用于当所述处理单元判断所述电路域业务为非语音业务 时, 向所述基站发送承载释放消息以指示所述基站释放所述语音资源。
19、 根据权利要求 18所述的 MSC, 其特征在于,
所述接收单元, 还用于接收所述 UE发送的业务连接建立请求消息, 所述 业务连接建立请求消息指示所述电路域业务为非语音业务;
所述处理单元,用于根据所述接收单元接收的所述业务连接建立请求消息 判断所述电路域业务为非语音业务。
20、 根据权利要求 18所述的 MSC, 其特征在于,
所述处理单元,用于根据所述电路域业务的类型判断所述电路域业务为非 语音业务;
所述发送单元, 还用于向所述 UE发送业务连接建立请求消息, 所述业务 连接建立请求消息指示所述电路域业务为非语音业务。
21、 根据权利要求 18-20任一所述的 MSC, 其特征在于,
所述发送单元,还用于当所述处理单元判断所述电路域业务为非语音业务 时, 向所述 UE发送会话释放消息, 所述会话释放消息用于请求所述 UE释放所 述 UE在从所述 LTE网络切换到所述 2G或 3G网络的 CS域过程中生成的语音会 话。
22、 一种位于长期演进 LTE网络的用户设备 UE, 其特征在于, 包括: 发送单元, 用于向移动管理实体 MME发送请求消息, 所述请求消息用于 为电路域业务请求电路回退 CSFB;
接收单元, 用于接收演进基站 eNodeB发送的切换命令, 所述切换命令用 于指示所述 UE为所述 CSFB从所述 LTE网络切换到第二代 2G或第三代 3G网络 的电路交换 CS域,所述切换命令中包含所述 2G或 3G网络为所述 UE从所述 LTE 网络切换到所述 2G或 3G网络的电路交换 CS域分配的语音资源的信息;
所述发送单元, 还用于向 2G或 3G网络的基站发送切换完成消息; 所述接收单元,还用于接收所述基站发送的承载释放消息, 所述承载释放 消息用于指示所述基站释放了所述语音资源。
23、 根据权利要求 22所述的用户设备, 其特征在于,
所述发送单元, 还用于在向所述 2G或 3G网络的基站发送切换完成消息之 后, 所述接收单元接收所述基站发送的承载释放消息之前, 向所述 MSC发送 业务连接建立请求消息,所述业务连接建立请求消息指示所述电路域业务为非 语音业务, 或者
所述接收单元, 还用于在所述发送单元向所述基站发送切换完成消息之 后, 接收所述基站发送的承载释放消息之前, 接收所述 MSC发送的业务连接 建立请求消息, 所述业务连接建立请求消息指示所述电路域业务为非语音业 务。
24、 根据权利要求 22或 23所述的用户设备, 其特征在于,
所述接收单元, 还用于接收所述 MSC发送的会话释放消息, 所述会话释 放消息用于请求所述 UE释放在从所述 LTE网络切换到所述 2G或 3G网络的 CS 域过程中生成的语音会话。
25、 一种节约语音资源的系统, 其特征在于, 包括: 移动管理实体 MME、 移动交换中心 MSC、 演进基站 eNodeB;
所述 MME接收所述 MSC发送的用于寻呼用户设备 UE的第一寻呼请求消 息,所述第一寻呼请求消息包含第一指示信息,所述第一指示信息用于指示非 语音业务;
根据所述第一寻呼请求消息, 所述 MME向所述 eNodeB发送通知消息, 所 述通知消息用于指示所述 eNodeB不为所述非语音业务把所述 UE从长期演进 LTE网络切换到第二代 2G或第三代 3G网络的 CS域;
所述 eNodeB接收所述 MME发送的所述通知消息;
所述 eNodeB根据所述通知消息向所述 MME发送从所述 LTE网络到 2G或 3G网络的分组交换 PS域的切换要求消息, 或者
所述 eNodeB向所述 UE发送重定向请求。
26、 一种节约语音资源的系统, 其特征在于, 包括: 移动管理实体 MME、 移动交换中心 MSC、 演进基站 eNodeB、 第二代 2G或第三代 3G网络的基站; 位于长期演进 LTE网络的用户设备 UE向所述 MME发送请求消息, 所述请 求消息用于为电路域业务请求电路回退 CSFB;
所述 MSC接收所述 MME发送的第一切换请求消息, 所述第一切换请求消 息用于请求所述 MSC为电路域业务将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的电路交换 CS域;
所述 MSC向所述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电路域业务分配语音资源;
所述 UE接收所述 eNodeB发送的切换命令,所述切换命令用于指示所述 UE 为所述 CSFB从所述 LTE网络切换到所述 2G或 3G网络的电路交换 CS域,所述切 换命令中包含所述语音资源的信息;
所述 UE向所述基站发送切换完成消息;
所述 MSC接收所述基站发送的切换完成消息;
所述 MSC判断所述电路域业务是否为非语音业务;
当所述 MSC判断所述电路域业务为非语音业务时, 所述 MSC向所述基站 发送承载释放消息以指示所述基站释放所述语音资源。
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