WO2015165079A1 - 处理下行电路交换cs业务的方法及移动管理实体 - Google Patents

处理下行电路交换cs业务的方法及移动管理实体 Download PDF

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Publication number
WO2015165079A1
WO2015165079A1 PCT/CN2014/076605 CN2014076605W WO2015165079A1 WO 2015165079 A1 WO2015165079 A1 WO 2015165079A1 CN 2014076605 W CN2014076605 W CN 2014076605W WO 2015165079 A1 WO2015165079 A1 WO 2015165079A1
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Prior art keywords
mme
request message
service
paging
message
Prior art date
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PCT/CN2014/076605
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English (en)
French (fr)
Inventor
舒林
李章原
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.)
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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 PCT/CN2014/076605 priority Critical patent/WO2015165079A1/zh
Priority to RU2016146477A priority patent/RU2660632C2/ru
Priority to EP14890898.1A priority patent/EP3131361A4/en
Priority to CN201480003265.5A priority patent/CN105309035B/zh
Publication of WO2015165079A1 publication Critical patent/WO2015165079A1/zh
Priority to US15/338,108 priority patent/US20170048758A1/en

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Classifications

    • 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
    • H04W8/00Network data management
    • H04W8/02Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06Registration at serving network Location Register, VLR or user mobility server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W60/00Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/005Multiple registrations, e.g. multihoming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W60/00Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup

Definitions

  • the present invention relates to the field of communications and, in particular, to a method and a mobility management entity for processing downlink circuit switched CS services. Background technique
  • Evolved Packet System is the 3rd Generation Partnership Project (3GPP) in the second generation (The Second Generation, 2G) mobile communication network GSM/EDGE (Global System of Mobile) Communication/Enhanced Data Rate for GSM Evolution, Global Mobile Telecommunications System / Enhanced Data Rate GSM Evolution Technology) and The Third Generation (3G) Mobile Communication Network UMTS (Universal Mobile Telecommunications System) Based on the launch.
  • the EPS network includes an Evolved Universal Mobile Telecommunication System Territorial Radio Access Network (E-UTRAN) and an Evolved Packet Core Network (EPC).
  • CSFB CS Fallback
  • the CSFB technology enables the user equipment (User Equipment, UE for short) covered by the E-UTRAN to return to the 2G/3G network CS domain to complete the service processing when the circuit switching (CS) voice service needs to be processed.
  • UEs that reside in E-UTRAN and support CSFB need to initiate a joint registration procedure to implement simultaneous registration to the EPC Network Packet Switched (PS) domain and the 2G/3G network CS domain. After successful joint registration, the CSFB service of the upstream and downstream can be initiated normally.
  • PS EPC Network Packet Switched
  • the MSC/VLR If the MSC/VLR registered by the UE is reset and restarted, the MSC/VLR sends an SGs search to all MMEs having an SGs interface with the MSC/VLR when receiving a downlink (Mobile Terminating, MT) CS voice service request from the UE. Call the request message. If the UE is currently in an idle state, the registered MME will initiate an air interface paging to the UE and will page the core network (Core Network, The CN) field is set to "CS". After receiving the paging with the CN field being "CS", the UE sends an Extended Service Request message as a paging response and enters the connected state.
  • a downlink (Mobile Terminating, MT) CS voice service request Call the request message.
  • the UE If the UE is currently in an idle state, the registered MME will initiate an air interface paging to the UE and will page the core network (Core Network, The CN) field is set to "CS". After receiving the
  • the MME After receiving the paging response of the UE, the MME needs to perform two processes: (1) transmitting a message carrying the CSFB indication to the evolved Node B (eNodeB) to continue the current downlink CSFB process; And requesting the UE to initiate a CS service re-registration process, that is, sending a separate request message with a separation type of "International Mobile Subscriber Identity (IMSI) separation" to the UE.
  • IMSI International Mobile Subscriber Identity
  • the UE After receiving the detach request message, the UE initiates a joint location update process of the update type "Tracking Area (TA) / Location Area (LA) and IMSI Attachment".
  • the MME receives the joint location update request message sent by the UE, the MME needs to perform the process conflict processing, that is, before the extended service request process is completed, the joint location update request is received.
  • the UE also needs to perform the process conflict processing, that is, before the current extended service request process is not completed, the detach request message sent by the MME is received. There is currently no effective mechanism for dealing with such process conflicts. Summary of the invention
  • the embodiment of the present invention provides a method and a device for processing a downlink circuit-switched CS service.
  • the MSC/VLR is restarted and restarted, and the downlink CS service to the idle state UE is initiated, the UE can be preferentially registered in the CS domain, thereby avoiding the UE. Process conflicts with the network side.
  • a method for processing a downlink circuit switched CS service includes: a mobility management entity MME receiving a notification message sent by a mobile service switching center/visiting location register MSC/VLR after restarting, the notification message being used to indicate the MME
  • the downlink circuit-switched CS service for the user equipment UE when the UE is in the idle state, the MME suspends the CS fallback procedure triggered by the downlink CS service; the MME requests the UE to enter the connected state; the MME requests the UE to initiate the joint location update procedure, so that the UE completes After the UE completes the registration in the CS domain, the MME notifies the UE to perform the CS fallback procedure triggered by the downlink CS service.
  • the notification message is a first paging request message
  • the method further includes: the MME buffering the first paging request message, where the CS falling back triggered by the downlink CS service is suspended
  • the process includes: suspending a CS fallback process triggered by the first paging request message.
  • the MME requests the UE to enter the connection state, including: the MME sends an air interface paging message to the UE, and the core network CN domain included in the air interface paging message is the CS domain.
  • the method further includes: the MME receiving an extended service request message sent by the UE according to the air interface paging message.
  • the method further includes: the MME starting the first timer, where the UE completes the CS After the registration of the domain, the MME notifies the UE to perform the CS fallback procedure triggered by the downlink CS service, including: after the UE completes the registration in the CS domain, before the first timer expires, the MME receives the second paging request sent by the MSC/VLR.
  • the UE is notified to perform the CS fallback procedure triggered by the second paging request message, where the second paging request message is used to indicate the downlink CS service of the MME, and the second paging request message includes the international mobile subscriber identity IMSI of the UE. And the location area identifier LAI; or, after the UE completes the registration in the CS domain, when the first timer expires, the MME notifies the UE to execute the CS fallback procedure triggered by the suspended first paging request message.
  • the second paging request message is used to indicate the downlink CS service of the MME
  • the second paging request message includes the international mobile subscriber identity IMSI of the UE.
  • the location area identifier LAI or, after the UE completes the registration in the CS domain, when the first timer expires, the MME notifies the UE to execute the CS fallback procedure triggered by the suspended first paging request message.
  • the method further includes: the MME sending an initial context setup request message to the evolved Node B eNodeB,
  • the initial context setup request message does not include circuit switched fallback CSFB indication information.
  • the MME requests the UE to enter the connected state, including: the MME sends an air interface paging message to the UE, where the CN domain included in the air interface paging message is a packet switched PS domain.
  • the method further includes: the MME receiving a service request message sent by the UE according to the air interface paging message.
  • the method further includes: the MME starting a second timer, where, in the UE After the registration of the CS domain is completed, the MME notifies the UE to perform the CS fallback procedure triggered by the downlink CS service, including: after the UE completes the registration in the CS domain, before the second timer expires, the MME receives the second sent by the MSC/VLR.
  • the UE When the paging request message is sent, the UE is notified to perform a CS fallback procedure triggered by the second paging request message, where the second paging request message is used to indicate the downlink CS service of the MME, and the second paging request message includes the IMSI of the UE. LAI; or, after the UE completes the registration in the CS domain, when the second timer expires, the MME notifies the UE to execute the CS fallback procedure triggered by the suspended first paging request message.
  • the MME requesting the UE to initiate the joint location update process includes: sending, by the MME, the UE The detach request message is used to request the UE to initiate a joint location update procedure, and the detach type included in the detach request message is IMSI separation.
  • the MME notifying the UE to perform the downlink CS service triggered CS fallback process includes: The MME sends a CS service notification message to the UE, so that the UE performs the CS fallback process triggered by the downlink CS service.
  • the second aspect provides a mobility management entity MME, including: a receiving module, configured to receive a notification message that is sent after the mobile service switching center/visiting location register MSC/VLR is restarted, where the notification message is used to indicate that the MME is for the user equipment UE.
  • a downlink circuit switched CS service a processing module, configured to suspend a CS fallback process triggered by a downlink CS service when the UE is in an idle state, and a requesting module, configured to request the UE to enter a connected state, and request the UE to initiate a joint location update process,
  • the UE is configured to complete the registration in the CS domain.
  • the notification module is configured to notify the UE to perform the CS fallback process triggered by the downlink CS service after the UE completes the registration in the CS domain.
  • the notification message that is received by the receiving module is a first paging request message
  • the MME further includes: a cache module, configured to cache the first paging request message
  • the processing module is specifically configured to suspend the CS fallback process triggered by the first paging request message.
  • the requesting module is specifically configured to send an air interface paging message to the UE, where the air interface paging message includes a core network CN domain
  • the receiving module is further configured to receive an extended service request message sent by the UE according to the air interface paging message.
  • the MME further includes: a first timing module, configured to: after the receiving module receives the extended service request message sent by the UE The first timer is started, where the notification module is specifically configured to notify, when the receiving module receives the second paging request message sent by the MSC/VLR, after the UE completes registration in the CS domain and before the first timer expires, The UE performs a CS fallback procedure triggered by the second paging request message, where the second paging request message is used to indicate the downlink CS service of the MME, and the second paging request message includes the international mobile subscriber identity (IMSI) and the location area identifier LAI of the UE.
  • IMSI international mobile subscriber identity
  • the notification module is specifically configured to: after the UE completes registration in the CS domain, the first timer is super At the same time, the UE is notified to execute the CS fallback process triggered by the first paging request message suspended by the processing module.
  • the requesting module is further configured to: after the receiving module receives the extended service request message sent by the UE, to the evolved node The B eNodeB sends an initial context setup request message that does not include circuit switched fallback CSFB indication information.
  • the requesting module is specifically configured to send an air interface paging message to the UE, where the CN domain included in the air interface paging message is a packet
  • the receiving module is further configured to receive a service request message sent by the UE according to the air interface paging message.
  • the MME further includes: a second timing module, configured to complete registration in the CS domain in the UE
  • the notification module is specifically configured to: after the UE completes the registration in the CS domain, before the second timer expires, when the receiving module receives the second paging request message sent by the MSC/VLR, Notifying the UE to perform a CS fallback procedure triggered by the second paging request message, where the second paging request message is used to indicate the downlink CS service of the MME, and the second paging request message includes the IMSI and the LAI of the UE; or, the notification module Specifically, after the UE completes the registration in the CS domain and the second timer expires, the UE is notified to perform a CS fallback process triggered by the first paging request message suspended by the processing module.
  • the requesting module is specifically configured to: Sending a detach request message to the UE, the detach request message is used to request the UE to initiate a joint location update procedure, and the detach type included in the detach request message is IMSI separation.
  • the notification module is specifically configured to: Sending a CS service notification message to the UE, so that the UE performs a CS fallback procedure triggered by the downlink CS service.
  • the MME can give the priority of the UE by suspending the CS fallback process triggered by the downlink CS service when the UE is in the idle state.
  • the registration in the CS domain is completed, and then the UE is notified to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • FIG. 1 shows a schematic flow diagram of a method of processing downlink circuit switched CS traffic in accordance with an embodiment of the present invention.
  • FIG. 2 is a schematic flow chart showing a method of processing a downlink circuit switched CS service according to another embodiment of the present invention.
  • FIG. 3 is a schematic flow chart showing a method of processing a downlink circuit switched CS service according to another embodiment of the present invention.
  • FIG. 4 is a schematic flow chart showing a method of processing a downlink circuit switched CS service according to another embodiment of the present invention.
  • FIG. 5 shows a schematic block diagram of a mobility management entity in accordance with an embodiment of the present invention.
  • FIG. 6 shows a schematic block diagram of a mobility management entity in accordance with another embodiment of the present invention. detailed description
  • the user equipment may be any one of the following, and the user equipment may be static or mobile.
  • User equipment may include, but is not limited to, a station, a mobile station, a subscriber unit, a personal computer, a laptop computer, a laptop computer, a laptop computer. Tablet Computer, Netbook, Terminal, Cellular Phone, Handheld, Cordless Phone, Personal Digital Assistant (PDA), Data Card (Data Card), USB plug-in device, MiFi Devices, smart watch, smart glasses, modem, wireless router, wireless local loop WLL) Taiwan and so on.
  • PDA Personal Digital Assistant
  • Data Card Data Card
  • USB plug-in device MiFi Devices
  • smart watch smart glasses
  • modem wireless router, wireless local loop WLL
  • wireless local loop WLL wireless local loop WLL
  • method 100 includes the following.
  • the MME receives the notification message sent by the mobile service switching center/visiting location register MSC/VLR after restarting, and the notification message is used to indicate that the MME exchanges CS services for the downlink (Mobile Terminating, MT) circuit of the user equipment UE.
  • CS Mobile Terminating
  • the UE has initiated a joint attach procedure and a joint location update procedure, and successfully co-registered in the CS domain of the EPC network PS domain and the 2G/3G network. Then, the MSC/VLR registered by the UE is reset and restarted. After receiving the downlink CS service request of the UE after the reset and restart, the MSC/VLR sends a notification message to all MMEs that have an SGs interface with the MSC/VLR. It should be understood that after the MSC/VLR is restarted, a reset indication message is sent to all MMEs that have an SGs interface connection, and the MME indicates that the MSC/VLR is unreliable after receiving the reset indication message. In other words, the MME can learn the MSC/VLR reset. Restart.
  • the MME suspends the CS fallback process triggered by the downlink CS service.
  • the MME requests the UE to enter a connected state.
  • the MME requests the UE to initiate a joint location update procedure, so that the UE completes registration in the CS domain.
  • the UE when the UE is in the idle state, the UE is first brought into the connected state from the idle state, and then the UE is requested to initiate the joint location update procedure.
  • the MME After the UE completes the registration in the CS domain, the MME notifies the UE to perform the CS fallback process triggered by the downlink CS service.
  • the MME When the MME receives the joint location update request message sent by the UE, the MME needs to perform the process conflict processing, that is, before the extended service request process is completed, the joint location update request is received. For the UE side, the UE also needs to perform the process conflict processing, that is, before the current extended service request process is completed, the detach request message sent by the MME is received.
  • the UE may fall back to the 2G/3G network before the MME initiates the separation process, causing the UE to fail to connect.
  • the MME After the MSC/VLR re-initiated the downlink CSFB process, the MME still needs the eNodeB to establish the air interface bearer, and cannot directly perform the downlink CSFB process in the connected state. If the MME performs the extended service request process and the separation process in parallel, the UE may be jointly fed.
  • the location update process If the location update process is completed, it will fall back to 2G/3G, causing the current joint location update process and the subsequent MSC/VLR re-initiated downlink CSFB process to be abnormal or even fail, and cause unnecessary signaling overhead; if the MME executes the extended service request in parallel In the process and the separation process, a process conflict occurs between the UE side and the MME side, which causes the complexity of the UE side and the MME side.
  • the MME after receiving the notification message of the downlink CS service for the UE that is sent after the MSC/VLR is restarted, the MME triggers the downlink CS service by suspending the UE when the UE is in the idle state.
  • the CS fallback process can enable the UE to preferentially complete the registration in the CS domain, and then notify the UE to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • the notification message in 110 is a first paging request message
  • the method 100 further includes: the MME buffering the first paging request message, where the CS that is triggered by the downlink CS service is suspended
  • the process includes: suspending a CS fallback process triggered by the first paging request message.
  • the first paging request message is used to indicate the downlink circuit switching of the MME for the UE.
  • the CS service includes the indication information of the downlink CS service in the first paging request message.
  • the first paging request message includes an International Mobile Subscriber Identity (IMSI) of the UE, but does not include a Location Area Identifier (LAI) of the UE.
  • IMSI International Mobile Subscriber Identity
  • LAI Location Area Identifier
  • the MME suspends the CS fallback process triggered by the first paging request message, and caches the first paging request message, so that the UE preferentially performs the registration after the registration of the CS domain.
  • the CS fallback process triggered by the request message is not limited to the CS fallback process triggered by the request message.
  • the method includes: the MME sends an air interface paging message to the UE, where the core network CN domain included in the air interface paging message is a CS domain, and the method 100 further includes: Receiving an Extended Service Request message sent by the UE according to the air interface paging message.
  • the extended service request message may be used by the UE to initiate a CS fallback procedure, where the extended service request message is used as a response message to the air interface paging message.
  • the method 100 further includes: the MME starting the first timer, specifically, 150: 150a, after the UE completes registration in the CS domain, the first timer Before the timeout, the MME receives the second paging request message sent by the MSC/VLR, and notifies the UE to perform the CS fallback procedure triggered by the second paging request message, where the second paging request message is used to indicate that the MME is for the UE.
  • the downlink CS service, the second paging request message includes the IMSI and the LAI of the UE; or, 150b, after the UE completes the registration in the CS domain, when the first timer expires, the MME notifies the UE to perform the suspension
  • the second paging request message includes indication information of the downlink CS service, and the second paging request message is sent by the MSC/VLR after the UE completes registration in the CS domain.
  • the MME may notify the UE to perform the second paging request message triggering.
  • the CS fallback process the MME may also stop the first timer, delete the cached first paging request message, and terminate the suspended CS fallback process triggered by the suspended first paging request message.
  • the MME After the UE completes the registration in the CS domain, when the first timer expires, if the MME does not receive the second paging request message sent by the MSC/VLR, the MME notifies the UE to perform the previously buffered first paging request message triggering. The CS fallback process. The MME can then delete the cached first page request message.
  • the MME may not start the first timer in the method 100, and the MME may complete the registration in the CS domain after the UE completes the registration in the CS domain. Immediately, the UE is notified to perform the CS fallback procedure triggered by the suspended first paging request message, and the cached first paging request message is deleted.
  • the method 100 further includes: the MME sending an Initial Context Setup request message to the evolved NodeB (eNodeB), the initial context setup request message does not include the CSFB indication. information.
  • the initial context setup request message sent by the MME to the eNodeB does not include the CSFB finger. If the information is displayed, the eNodeB will not continue the CSFB process, thereby ensuring that the UE first completes the re-registration to the CS domain. It should be noted that the re-registration is said to be successfully registered with the CS domain of the EPC network PS domain and the 2G/3G network before the 110, which is equivalent to registering the CS domain again.
  • the method includes: the MME sends an air interface paging message to the UE, where the CN domain included in the air interface paging message is a Packet Switched (PS) domain, and the method 100 further includes: The MME receives a service request (Service Request) message sent by the UE according to the air interface paging message.
  • PS Packet Switched
  • the UE can initiate a normal service request instead of an extended service request message.
  • the service request message can be used as a response message to the air interface paging message.
  • the method 100 further includes: the MME starting a second timer, and correspondingly, in 150, comprising: 150c, after the UE completes registration in the CS domain, the second timing
  • the MME receives the second paging request message sent by the MSC/VLR, the MME notifies the UE to perform the CS fallback procedure triggered by the second paging request message, where the second paging request message is used to indicate that the MME is for the UE.
  • the downlink CS service, the second paging request message includes the IMSI and the LAI of the UE; or, 150d, after the UE completes registration in the CS domain, when the second timer expires, the MME notifies the UE to perform the suspension.
  • the second paging request message includes indication information of the downlink CS service, and the second paging request message is sent by the MSC/VLR after the UE completes registration in the CS domain.
  • the MME may be notified to perform the CS fallback procedure triggered by the second paging request message.
  • the MME may stop the second timer and delete the cached first paging request message.
  • the UE may be notified to perform the CS fallback procedure triggered by the buffered first paging request message.
  • the MME may delete the first paging request message from the cache.
  • the MME may not start the second timer in the method 100, and the MME may notify the UE to perform the suspended first paging request message after the UE completes the registration in the CS domain.
  • the CS falls back to the flow and deletes the cached first page request message.
  • the MME sends a detach request message to the UE, where the detach request message is used to request the UE to initiate a joint location update procedure, where the detach type included in the detach request message is IMSI detach.
  • the MME sends a CS Service Notification message to the UE, so that the UE performs a CS fallback procedure triggered by the downlink CS service.
  • the MME suspends the downlink CS when the UE is in the idle state.
  • the service-triggered CS fallback process enables the UE to preferentially complete the registration in the CS domain, and then notifies the UE to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • FIG. 2 shows a schematic flow diagram of a method 200 of processing downlink circuit switched CS services in accordance with an embodiment of the present invention.
  • the method 200 is an example of the method 100.
  • the method 200 for processing a downlink CS service includes the following.
  • the UE initiates a joint attach process or a joint location update process, and successfully registers in the PS domain of the EPC network and the CS domain of the 2G/3G network.
  • the MSC/VLR registered by the UE is reset and restarted.
  • the MSC/VLR After receiving the downlink CS service request of the UE, the MSC/VLR sends an SGs paging request message to each MME that has an SGs interface with the MSC/VLR.
  • the MME starts a paging timer, and the SGs paging message includes the identity identifier IMSI of the UE, but does not include the location information identifier LAI of the UE. It should be noted that after the MSC/VLR restarts, a reset indication message is sent to all MMEs that have an SGs interface connection, and the MME marks the MSC/VLR as unreliable after receiving the reset indication message.
  • the MME suspends the CS fallback procedure triggered by the SGs paging request message, and caches the SGs paging. Request message.
  • the MME initiates an air interface paging to the UE, that is, sends a paging request message to the UE.
  • the MME sets the CN field of the paging message to "PS".
  • the UE initiates a normal service request (Service Request) process to the MME as a paging response.
  • Service Request Service Request
  • the MME performs the normal service request procedure, so that the UE changes from an idle state to a connected state.
  • the MME sends a detach request message to the UE, and initiates a separate process of separating the type of "IMSI separation" to trigger the UE to initiate the CS service recovery process.
  • the MME may perform 206a and 206b at the same time, or may perform 206a and then execute 206b, or may perform 206b and then perform 206a. It should be noted that, by performing the initiation process of step 206a, the UE is changed from the idle state to the connected state, indicating that the underlying link has been established between the UE and the MME.
  • the UE initiates a joint location update process, that is, sends a joint location update request message with an update type of “Joint TA/LA and IMSI Attachment” to the MME.
  • the MME performs and completes the joint location update process according to the prior art, and implements re-registration of the UE in the CS domain.
  • the joint location update process may be a Tracking Area Update (TAU) process.
  • TAU Tracking Area Update
  • the UE may reply to the MME in response to the detach message, and after receiving the detach message, the MME keeps the underlying link from being released, that is, keeps the UE in the Connected state to ensure that the joint location update process is successfully executed.
  • the MME starts a timer, and keeps the bottom link not released, that is, keeps the UE and the MME in a connected state.
  • the MSC/VLR completes the SGs interface location update process initiated by the MME. If the paging timer initiated in 203 does not time out, re-initiate the SGs paging to the MME.
  • the request message at this time, because the UE has recovered the CS registration to the restart MSC/VLR, the retransmitted SGs paging request message includes the location information LAI of the UE.
  • the MME receives the SGs paging request message including the LAI sent by the MSC/VLR before the timer started in 208a expires, the timer is stopped, and the SGs paging request not included in the LAI cached in 204a is cleared.
  • the message is executed 210b. 210b.
  • the MME initiates a CS Service Notification message to the UE by using the existing underlying link to continue the current downlink CSFB process.
  • the MME when the timer started in 208a times out, the MME performs 210d according to the SGs paging request message that is not included in the LAI cached in 204a, and clears the cached SGs paging request. Requesting a message; 210d, the MME directly uses the existing underlying link to initiate a CS Service Notification message to the UE to recover the downlink CSFB procedure suspended in 204a.
  • the two steps 210a and 210b are mutually exclusive with the two steps 210c and 210d, and the MME executions 210a and 210b do not execute 210c and 210d, and vice versa.
  • the MME receives
  • the MME can suspend the CS domain registration process by suspending the CS fallback process triggered by the downlink CS service. Then, the UE is notified to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • FIG. 3 illustrates a method 300 for processing a downlink CS service according to another embodiment of the present invention.
  • the method 300 is an example of the method 100.
  • the method 300 for processing a downlink CS service includes the following content.
  • the UE initiates a joint attach process or a joint location update process, and successfully registers in the PS domain of the EPC network and the CS domain of the 2G/3G network.
  • the MSC/VLR registered by the UE is reset and restarted.
  • the MSC/VLR After the MSC/VLR is restarted, after receiving the downlink CS service request of the UE, send an SGs paging request message to all MMEs that have an SGs interface with the MSC/VLR, and start a paging timer for each MME.
  • the SGs paging message includes the identity identifier IMSI of the UE, but does not include the location information identifier LAI of the UE. It should be noted that after the MSC/VLR is restarted, a reset indication message is sent to all MMEs that have an SGs interface, and the MME indicates that the MSC/VLR is unreliable after receiving the reset indication message.
  • the MME After the MME that is registered by the UE receives the SGs paging request message that does not include the LAI, when the UE is in the idle state, the MME suspends the CS fallback procedure triggered by the SGs paging request message, and caches the SGs paging request. Message.
  • the UE sends an extended service request (Extended Service Request) process to the MME as a paging response.
  • the extended service request procedure causes the UE to change from the idle state to the connected state.
  • the UE changes from the idle state to the connected state it indicates that the underlying link has been established between the UE and the MME.
  • the MME caches an SGs paging request message that does not include the LAI, the MME starts a timer.
  • the MME initiates a separation type to the UE as an "IMSI score".
  • the separation process from "" triggers the UE to initiate the CS service recovery process.
  • the duration of the timer is guaranteed to complete the subsequent entire joint location update process. It should also be understood that the MME may perform 306a and 306b at the same time, or may perform 306a and then perform 306b, or may perform 306b and then perform 306a.
  • the UE initiates a joint location update process, that is, sending the update type to “Joint TA/LA and
  • the IMSI attaches the "Joint Location Update Request message" to the MME.
  • the MME performs and completes the joint location update procedure according to the prior art to implement re-registration of the UE in the CS domain.
  • the joint location update The process may be specifically a TAU process.
  • the UE may reply to the MME, and after receiving the detach message, the MME maintains the underlying link. If not released, the UE is kept in the connected state to ensure that the joint location update process is successfully executed.
  • the MME keeps the downlink link from being released, that is, keeps the UE and the MME in a connected state.
  • the MSC/VLR completes the SGs interface location update process initiated by the MME. If the paging timer initiated in 303 does not time out, the SGs paging request to the MME is re-initiated. The message, at this time, because the UE has recovered the CS registration to the restart MSC/VLR, the retransmitted SGs paging request message includes the location information LAI of the UE.
  • the MME initiates a CS service notification message to the UE by using the existing underlying link to continue the current downlink CSFB process.
  • 310c when the timer started by 306a times out, according to the SGs paging request message that is not included in the LAI cached in 304a, performing 310d, and clearing the cached SGs paging request message; 310d, the MME directly utilizing the existing underlying link A CS service notification message is initiated to the UE to recover the downlink CSFB procedure suspended in 304a.
  • the two steps 310a and 310b are mutually exclusive with the two steps 310c and 310d, and the MME executions 310a and 310b do not execute 310c and 310d, and vice versa.
  • the MME suspends the downlink CS when the UE is in the idle state.
  • the service-triggered CS fallback process enables the UE to preferentially complete the registration in the CS domain, and then informs the UE to perform the CS fallback triggered by the downlink CS service. The process can avoid the process conflict processing between the UE and the network side.
  • FIG. 4 illustrates a method 400 for processing a downlink CS service according to another embodiment of the present invention.
  • the method 400 is an example of the method 100.
  • the method 400 for processing a downlink CS service includes the following.
  • the UE initiates a joint attach process or a joint location update process, in the PS domain of the EPC network.
  • the MSC/VLR registered by the UE is reset.
  • the MSC/VLR After the MSC/VLR is restarted, after receiving the downlink CS voice service request of the UE, send an SGs paging request message to all MMEs that have an SGs interface with the MSC/VLR, and start a paging timer for each MME.
  • the SGs paging message includes the identity identifier IMSI of the UE, but does not include the location information identifier LAI of the UE. It should be noted that after the MSC/VLR restarts, a reset indication message is sent to all MMEs that have an SGs interface connection, and the MME marks the MSC/VLR as unreliable after receiving the reset indication message.
  • the MME suspends the CS fallback procedure triggered by the SGs paging request message, and caches the SGs paging. Request message.
  • the MME initiates an air interface paging to the UE, and the MME sets the CN field of the paging message to "CS".
  • the UE initiates an extended service request procedure to the MME as a paging response.
  • the extended service request procedure causes the UE to change from the idle state to the connected state.
  • the UE changes from the idle state to the connected state it indicates that the underlying link has been established between the UE and the MME.
  • the MME After receiving the extended service request message, the MME performs the extended service request procedure as usual. If the MME caches an SGs paging request message that does not include the LAI, the MME performs 406b.
  • the MME sends an Initial Context Setup request message to the eNodeB, where the initial context setup request message does not include the CSFB indication information, and the MME does not send the CSFB indication information to the eNodeB in 406b, which is equivalent to
  • the MME translates the current extended service request process into a normal service request process for execution.
  • the MME initiates a separate process of separating the type of “IMSI separation” from the UE to trigger the UE to initiate a CS service recovery process.
  • the MME may perform 406b and 406c at the same time, or may perform 406b and then perform 406c, or may perform 406c and then perform 406b. 407.
  • the UE initiates a joint location update procedure, that is, sends a joint location update request message with an update type of "Joint TA/LA and IMSI Attachment" to the MME.
  • the MME performs and completes the joint location update procedure according to the prior art, and implements re-registration of the UE in the CS domain.
  • the joint location update process may specifically be a TAU process.
  • the UE may reply to the MME in response to the detach message, and after receiving the detach message, the MME keeps the underlying link from being released, that is, keeps the UE in the Connected state to ensure that the joint location update process is successfully executed.
  • the MME starts a timer, and keeps the downlink link not released, that is, keeps the UE and the MME in a connected state.
  • the MSC/VLR completes the SGs interface location update procedure initiated by the MME. If the paging timer started in 403 does not time out, the SGs paging request to the MME is re-initiated. The message, at this time, because the UE has recovered the CS registration to the restart MSC/VLR, the retransmitted SGs paging request message includes the location information LAI of the UE.
  • the MME If the MME receives the SGs paging request message including the LAI sent by the MSC/VLR before the timer started by the 408, the MME stops the timer and clears the SGs paging request message that is not included in the LAI cached in the 404a.
  • 410b 410b, the MME initiates a CS service notification message to the UE by using the existing underlying link to continue the current downlink CSFB process.
  • the MME when the timer started by 408 times out, the MME performs 410d according to the SGs paging request message that is not included in the LAI cached in 404a, and clears the cached SGs paging request message; 410d, the MME directly utilizes the existing bottom layer The link initiates a CS service notification message to the UE to recover the downlink CSFB procedure suspended in 404a.
  • steps 410a and 410b are mutually exclusive with the steps of 410c and 410d, and the MME executes 410a and 410b without executing 410c and 410d, and vice versa.
  • FIGS. 2 through 4 are intended to assist those skilled in the art to better understand the embodiments of the present invention and are not intended to limit the scope of the embodiments of the present invention.
  • a person skilled in the art will be able to make various modifications and changes in the embodiments according to the examples of FIG. 2 to FIG. 4, and such modifications or variations are also within the scope of the embodiments of the present invention.
  • the size of the sequence numbers of the above processes does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention. Therefore, in the method for processing the downlink circuit-switched CS service in the embodiment of the present invention, after receiving the notification message for the downlink CS service of the UE that is sent after the MSC/VLR is restarted, the MME suspends the downlink CS when the UE is in the idle state.
  • the service-triggered CS fallback process enables the UE to preferentially complete the registration in the CS domain, and then notifies the UE to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • the mobility management entity MME 500 includes: a receiving module 510, a processing module 520, a requesting module 530, and a notification module 540.
  • the receiving module 510 is configured to receive a notification message sent by the MSC/VLR after the mobile service switching center/visiting location register is restarted, and the notification message is used to indicate that the MME exchanges CS services for the downlink circuit of the user equipment UE.
  • the processing module 520 is configured to suspend the CS fallback process triggered by the downlink CS service when the UE is in an idle state.
  • the requesting module 530 is configured to request the UE to enter the connection state, and is further configured to request the UE to initiate a joint location update procedure, so that the UE completes registration in the CS domain.
  • the notification module 540 is configured to notify the UE to perform the CS fallback process triggered by the downlink CS service after the UE completes the registration in the CS domain.
  • the mobile management entity of the embodiment of the present invention suspends the CS fallback process triggered by the downlink CS service when the UE is in an idle state.
  • the UE can be preferentially registered in the CS domain, and then the UE is notified to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • the notification message received by the receiving module 510 is a first paging request message
  • the MME 500 further includes: a cache module 550, configured to cache the first paging request message, where the suspension module 520 is specifically configured to suspend the The CS fallback process triggered by the first paging request message.
  • the requesting module 530 is specifically configured to send an air interface paging message to the UE, where the core network CN domain included in the air interface paging message is a CS domain, and the receiving module 510 is further configured to receive the UE according to the air interface.
  • the MME 500 further includes: a first timing module, configured to start the first timer after the receiving module 510 receives the extended service request message sent by the UE.
  • the notification module 540 is specifically configured to: notify the UE to perform the second homing when receiving the second paging request message sent by the MSC/VLR after the UE completes the registration in the CS domain and before the first timer expires a CS fallback procedure triggered by the request message, where the second paging request message is used to indicate the downlink CS service of the MME for the UE, and the second paging request message includes an international mobile subscriber identity (IMSI) and a location area of the UE. Identify the LAI.
  • IMSI international mobile subscriber identity
  • the notification module 540 is specifically configured to notify the UE to perform a CS fallback process triggered by the first paging request message suspended by the processing module 520 after the UE completes the registration in the CS domain and the first timer expires.
  • the processing module 520 notifies the UE to perform the second The CS fallback process triggered by the paging request message.
  • the processing module 520 may also stop the first timer initiated by the first timing module, delete the first paging request message buffered by the cache module 550, and terminate the CS fallback process triggered by the suspended first paging request message.
  • the processing module 520 If the receiving module 510 does not receive the second paging request message sent by the MSC/VLR after the UE completes the registration in the CS domain, the processing module 520 notifies the UE that the processing module 520 hangs. The CS fallback process triggered by the first paging request message. The processing module 520 can also delete the first paging request message buffered by the cache module 550.
  • the requesting module 530 is further configured to: after the receiving module 510 receives the extended service request message sent by the UE, send an initial context setup request message, the initial context setup request, to the evolved Node B eNodeB.
  • the message does not include CSFB indication information.
  • the requesting module 530 is specifically configured to send an air interface paging message to the UE, where the CN domain included in the air interface paging message is a PS domain, and the receiving module 510 is further configured to receive the UE according to the air interface.
  • the service request message sent by the caller is specifically configured to send an air interface paging message to the UE, where the CN domain included in the air interface paging message is a PS domain, and the receiving module 510 is further configured to receive the UE according to the air interface.
  • the service request message sent by the caller.
  • the mobility management entity 500 may further include: a second timing module, configured to start a second timer after the UE completes registration in the CS domain.
  • the notification module 540 is specifically configured to: notify the UE to perform the second paging request when receiving the second paging request message sent by the MSC/VLR after the UE completes the registration in the CS domain and before the second timer expires.
  • Message triggered CS fallback process where the second paging request message is used Instructing the MME to perform the downlink CS service for the UE, the second paging request message includes an IMSI and an LAI of the UE.
  • the notification module 540 is specifically configured to notify the UE to perform the CS fallback process triggered by the first paging request message suspended by the processing module 520 after the UE completes the registration in the CS domain and the second timer expires.
  • the notification module 540 notifies the UE to perform the second The CS fallback process triggered by the paging request message.
  • the processing module 520 is further configured to stop the second timer that is started by the second timing module, and delete the first paging request message cached by the cache module 550.
  • the receiving module 510 If the receiving module 510 does not receive the second paging request message sent by the MSC/VLR after the UE completes the registration of the CS domain, the receiving module 510 notifies the UE to execute the processing module 520 to suspend.
  • the processing module 520 can also delete the first paging request message buffered by the cache module 550.
  • the requesting module 530 is specifically configured to send a detach request message to the UE, where the detach request message is used to request the UE to initiate a joint location update procedure, where the detach type included in the detach request message is IMSI detach.
  • the notification module 540 is specifically configured to send a CS service notification message to the UE, so that the UE performs a CS fallback procedure triggered by the downlink CS service.
  • the mobile management entity of the embodiment of the present invention suspends the CS fallback process triggered by the downlink CS service when the UE is in an idle state.
  • the UE can be preferentially registered in the CS domain, and then the UE is notified to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • FIG. 6 is a schematic block diagram of a mobility management entity 600 in accordance with an embodiment of the present invention.
  • the mobility management entity 600 includes: a processor 610, a memory 620, a bus system 630, and a transceiver 640.
  • the processor 610, the memory 620 and the transceiver 640 are connected by a bus system 630, and the memory 620 is used for
  • the instructions are stored by the processor 610 for executing instructions stored in the memory 620.
  • the transceiver 640 is configured to receive a notification message sent by the MSC/VLR after the mobile service switching center/visiting location register is restarted, and the notification message is used to indicate that the MME exchanges CS services for the downlink circuit of the user equipment UE.
  • the processor 610 is configured to suspend the CS fallback process triggered by the downlink CS service when the UE is in an idle state.
  • the transceiver 640 is further configured to request the UE to enter a connected state, and request the UE to initiate a joint location update procedure, so that the UE completes registration in the CS domain.
  • the transceiver 640 is further configured to notify the UE to perform the CS fallback process triggered by the downlink CS service after the UE completes registration in the CS domain.
  • the mobile management entity of the embodiment of the present invention suspends the CS fallback process triggered by the downlink CS service when the UE is in an idle state.
  • the UE can be preferentially registered in the CS domain, and then the UE is notified to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • the processor 610 may be a central processing unit (CPU), and the processor 610 may also be other general-purpose processors, digital signal processors (DSPs), and application specific integrated circuits. (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and more.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 620 can include read only memory and random access memory and provides instructions and data to the processor 610. A portion of memory 620 may also include non-volatile random access memory. For example, the memory 620 can also store information of the device type.
  • the bus system 630 may include a power bus, a control bus, and a status signal bus in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 630 in the figure.
  • each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 610 or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 620.
  • the processor 610 reads the information in the memory 620 and completes the steps of the above method in combination with hardware. To avoid repetition, it will not be described in detail here.
  • the notification message received by the transceiver 640 is a first paging request message.
  • the memory 620 is further configured to cache the first paging request message.
  • the processor 610 is specifically configured to suspend the CS fallback process triggered by the first paging request message.
  • the transceiver 640 is specifically configured to: send an air interface paging message to the UE, where the core network CN domain included in the air interface paging message is a CS domain; and receive the UE to send according to the air interface paging message.
  • Extended service request message is specifically configured to: send an air interface paging message to the UE, where the core network CN domain included in the air interface paging message is a CS domain; and receive the UE to send according to the air interface paging message.
  • Extended service request message is specifically configured to: send an air interface paging message to the UE, where the core network CN domain included in the air interface paging message is a CS domain.
  • the processor 610 is further configured to start the first timer after the transceiver 640 receives the extended service request message sent by the UE.
  • the transceiver 640 is specifically configured to: notify the UE to perform the second paging request when receiving the second paging request message sent by the MSC/VLR after the UE completes the registration in the CS domain and before the first timer expires.
  • the message-triggered CS fallback process where the second paging request message is used to indicate the downlink CS service of the MME for the UE, and the second paging request message includes the IMSI and the LAI of the UE.
  • the transceiver 640 notifies the UE to perform the CS fallback process triggered by the first paging request message suspended by the processor 610 after the UE completes the registration in the CS domain and the first timer expires.
  • the transceiver 640 if the transceiver 640 receives the second paging request message sent by the MSC/VLR after the UE completes registration in the CS domain, before the first timer expires, the transceiver 640 notifies the UE to perform the second The CS fallback process triggered by the paging request message.
  • the processor 610 may also stop the first timer, delete the first paging request message buffered by the memory 620, and terminate the CS fallback process triggered by the suspended first paging request message.
  • the transceiver 640 If the transceiver 640 does not receive the second paging request message sent by the MSC/VLR after the UE completes registration in the CS domain, the first timer expires, the transceiver 640 notifies the UE that the execution processor 610 hangs. The CS fallback process triggered by the first paging request message. In addition, the processor 610 can also delete the first paging request message buffered by the memory 620.
  • the transceiver 640 is further configured to: after receiving the extended service request message sent by the UE, send an initial context setup request message to the evolved Node B eNodeB, where the initial context setup request message does not include the CSFB indication information. .
  • the transceiver 640 is specifically configured to: send an air interface paging message to the UE, where the CN domain included in the air interface paging message is a PS domain; and receive a service sent by the UE according to the air interface paging message. Request message.
  • the processor 610 is further configured to complete the injection in the CS domain in the UE.
  • the second timer is started.
  • the transceiver 640 is specifically configured to notify the UE to perform the second paging request message when receiving the second paging request message sent by the MSC/VLR after the UE completes the registration in the CS domain and before the second timer expires.
  • the triggered CS fallback process where the second paging request message is used to indicate the downlink CS service of the MME for the UE, and the second paging request message includes the IMSI and the LAI of the UE.
  • the transceiver 640 is specifically configured to notify the UE to perform a CS fallback process triggered by the first paging request message suspended by the processor 610 when the second timer expires.
  • the transceiver 640 if the transceiver 640 receives the second paging request message sent by the MSC/VLR after the UE completes the registration in the CS domain and before the second timer expires, the transceiver 640 notifies the UE to perform the second The CS fallback process triggered by the paging request message.
  • the processor 610 can also stop the second timer and delete the first paging request message buffered by the memory 620.
  • the transceiver 640 If the transceiver 640 does not receive the second paging request message sent by the MSC/VLR after the UE completes registration in the CS domain, before the second timer expires, the transceiver 640 notifies the UE that the execution processor 610 hangs.
  • the processor 610 can also delete the first paging request message buffered by the memory 620.
  • the transceiver 640 is specifically configured to send a detach request message to the UE, where the detach request message is used to request the UE to initiate a joint location update process, and the detach type included in the detach request message is IMSI detach.
  • the transceiver 640 is specifically configured to send a CS service notification message to the UE, so that the UE performs a CS fallback procedure triggered by the downlink CS service.
  • a CS service notification message to the UE, so that the UE performs a CS fallback procedure triggered by the downlink CS service.
  • the mobile management entity of the embodiment of the present invention suspends the CS fallback process triggered by the downlink CS service when the UE is in an idle state.
  • the UE can be preferentially registered in the CS domain, and then the UE is notified to perform the CS fallback process triggered by the downlink CS service, so that the process conflict processing between the UE and the network side can be avoided.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct connection or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.
  • the components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • 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 functions, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

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Abstract

本发明实施例公开了一种处理下行电路交换CS业务的方法及移动管理实体。该方法包括:MME接收MSC/VLR重启后发送的通知消息,通知消息用于指示MME针对用户设备UE的下行CS业务;当UE处于空闲态时, MME挂起下行CS业务触发的CS回落流程;MME请求UE进入连接态; MME请求UE发起联合位置更新流程,以使UE完成在CS域的注册;在 UE完成在CS域的注册之后,MME通知UE执行下行CS业务触发的CS 回落流程。本发明实施例的处理下行电路交换CS业务的方法及移动管理实体,能够使UE优先完成在CS域的注册,然后通知UE执行下行CS业务触发的CS回落流程,从而能够避免UE与网络侧的流程冲突处理。

Description

处理下行电路交换 CS业务的方法及移动管理实体 技术领域
本发明涉及通信领域, 并且具体地, 涉及处理下行电路交换 CS业务的 方法及移动管理实体。 背景技术
演进分组系统(Evolved Packet System, 简称 EPS )是第三代合作伙伴 项目 ( 3rd Generation Partnership Project, 简称 3GPP )在第二代( The Second Generation , 简称 2G )移动通信网络 GSM/EDGE ( Global System of Mobile Communication/Enhanced Data Rate for GSM Evolution, 全球移动通信系统 / 增强型数据速率 GSM演进技术)和第三代( The Third Generation, 简称 3G ) 移动通信网络 UMTS ( Universal Mobile Telecommunications System, 通用移 动通信系统)的基础上推出的。 EPS网络包括演进通用移动通信系统陆地无 线接入网 ( Evolved Universal Mobile Telecommunication System Territorial Radio Access Network, 简称 E-UTRAN )和演进分组核心网 ( Evolved Packet Core Network, 简称 EPC )。
基于现有 2G/3G网络中移动交换中心 /拜访位置寄存器 (Mobile Switching Center/Visitors Location Register, 简称 MSC/VLR)与移动管理实体( Mobility Management Entity, 简称 MME )之间的 SGs接口功能, 3GPP提出了 "电 路交换回落" ( CS Fallback, 简称 CSFB )技术。 CSFB技术使 E-UTRAN覆 盖下的用户设备( User Equipment, 简称 UE )在需要处理电路交换( Circuit Switched, 简称 CS )语音业务时通过 E-UTRAN回到 2G/3G网络 CS域完成 业务处理。 在 CSFB机制中, 驻留在 E-UTRAN且支持 CSFB的 UE需要发 起联合注册流程实现到 EPC网络分组交换( Packet Switched, 简称 PS )域与 2G/3G网络 CS域的同时注册。 在成功实现联合注册后, 上下行的 CSFB业 务才能正常发起。
若 UE所注册的 MSC/VLR复位重启, 该 MSC/VLR在收到该 UE的下 行( Mobile Terminating, MT ) CS语音业务请求时, 会向所有与该 MSC/VLR 有 SGs接口的 MME发送 SGs寻呼请求消息。 若该 UE当前处于空闲态, 则 所注册的 MME会向该 UE发起空口寻呼并将寻呼的核心网( Core Network, 简称 CN )域设置为 "CS"。 该 UE在收到 CN域为 "CS" 的寻呼后, 会发 送扩展业务请求( Extended Service Request ) 消息作为寻呼响应, 并进入连 接态。
MME在收到该 UE的寻呼响应后, 需要执行两个流程: ( 1 )发送携带 有 CSFB指示的消息给演进型节点 B ( evolved Node B, eNodeB )以继续当前 的下行 CSFB流程; ( 2 )请求该 UE发起 CS业务重注册流程, 即发送分离 类型为 "国际移动用户标识 ( International Mobile Subscriber Identity, 简称 IMSI )分离" 的分离请求消息给该 UE。
对于流程(2 ), UE在收到该分离请求消息后, 发起更新类型为 "联合 跟踪域( Tracking Area, TA ) /位置域( Location Area, LA )并 IMSI附着" 的联合位置更新流程。 MME在收到 UE发送的联合位置更新请求消息时, MME需要执行流程冲突处理, 即: 在扩展业务请求流程未完成之前, 又收 到了联合位置更新请求。 对于 UE侧, UE也需要执行流程冲突处理, 即: 在当前扩展业务请求流程未完成之前, 又收到 MME发送的分离请求消息。 而目前还没有有效的机制处理这样的流程冲突。 发明内容
本发明实施例提供了一种处理下行电路交换 CS 业务的方法及装置, MSC/VLR复位重启后发起到空闲态 UE的下行 CS业务时, 能够优先实现 UE在 CS域的注册, 从而能够避免 UE与网络侧的流程冲突处理。
第一方面,提供了一种处理下行电路交换 CS业务的方法,该方法包括: 移动管理实体 MME接收移动业务交换中心 /拜访位置寄存器 MSC/VLR重启 后发送的通知消息, 通知消息用于指示 MME针对用户设备 UE的下行电路 交换 CS业务; 当 UE处于空闲态时, MME挂起下行 CS业务触发的 CS回 落流程; MME请求 UE进入连接态; MME请求 UE发起联合位置更新流程, 以使 UE完成在 CS域的注册; 在 UE完成在 CS域的注册之后, MME通知 UE执行下行 CS业务触发的 CS回落流程。
结合第一方面, 在第一种可能的实现方式中, 通知消息为第一寻呼请求 消息, 该方法还包括: MME緩存第一寻呼请求消息, 其中, 挂起下行 CS 业务触发的 CS回落流程, 包括: 挂起第一寻呼请求消息触发的 CS回落流 程。 结合第一种可能的实现方式, 在第二种可能的实现方式中, MME请求 UE进入连接态, 包括: MME向 UE发送空口寻呼消息, 空口寻呼消息包括 的核心网 CN域为 CS域; 该方法还包括: MME接收 UE根据该空口寻呼消 息发送的扩展业务请求消息。
结合第二种可能的实现方式, 在第三种可能的实现方式中, 在 MME接 收 UE发送的扩展业务请求消息之后, 该方法还包括: MME启动第一定时 器, 其中, 在 UE完成在 CS域的注册之后, MME通知 UE执行下行 CS业 务触发的 CS回落流程, 包括: 在 UE完成在 CS域的注册之后、 第一定时器 超时之前, MME接收到 MSC/VLR发送的第二寻呼请求消息时, 通知 UE 执行第二寻呼请求消息触发的 CS回落流程, 其中第二寻呼请求消息用于指 示 MME针对 UE的下行 CS业务,第二寻呼请求消息包括 UE的国际移动用 户标识 IMSI和位置区标识 LAI; 或者, 在 UE完成在 CS域的注册之后、 第 一定时器超时时, MME通知 UE执行挂起的第一寻呼请求消息触发的 CS回 落流程。
结合第二种可能的实现方式, 在第四种可能的实现方式中, 在 MME接 收 UE发送的扩展业务请求消息之后,该方法还包括: MME向演进型节点 B eNodeB 发送初始上下文建立请求消息, 初始上下文建立请求消息不包括电 路交换回落 CSFB指示信息。
结合第一种可能的实现方式, 在第五种可能的实现方式中, MME请求 UE进入连接态, 包括: MME向 UE发送空口寻呼消息, 空口寻呼消息包括 的 CN域为分组交换 PS域; 该方法还包括: MME接收 UE根据该空口寻呼 消息发送的业务请求消息。
结合第四种或第五种可能的实现方式, 在第六种可能的实现方式中, 在 UE完成在 CS域的重新注册之后, 该方法还包括: MME启动第二定时器, 其中, 在 UE完成在 CS域的注册之后, MME通知 UE执行下行 CS业务触 发的 CS回落流程, 包括: 在 UE完成在 CS域的注册之后、 第二定时器超时 之前, MME接收到 MSC/VLR发送的第二寻呼请求消息时, 通知 UE执行 第二寻呼请求消息触发的 CS 回落流程, 其中第二寻呼请求消息用于指示 MME针对 UE的下行 CS业务,第二寻呼请求消息包括 UE的 IMSI和 LAI; 或者, 在 UE完成在 CS域的注册之后、 第二定时器超时时, MME通知 UE 执行挂起的第一寻呼请求消息触发的 CS回落流程。 结合第一方面或第一种至第六种可能的实现方式中的任一种可能的实 现方式, 在第七种可能的实现方式中, MME请求 UE发起联合位置更新流 程包括: MME向 UE发送分离请求消息, 分离请求消息用于请求 UE发起 联合位置更新流程, 分离请求消息中包括的分离类型为 IMSI分离。
结合第一方面或第一种至第七种可能的实现方式中的任一种可能的实 现方式,在第八种可能的实现方式中, MME通知 UE执行下行 CS业务触发 的 CS回落流程包括: MME向 UE发送 CS业务通知消息, 以使 UE执行下 行 CS业务触发的 CS回落流程。
第二方面, 提供了一种移动管理实体 MME, 包括: 接收模块, 用于接 收移动业务交换中心 /拜访位置寄存器 MSC/VLR重启后发送的通知消息,通 知消息用于指示 MME针对用户设备 UE的下行电路交换 CS业务; 处理模 块, 用于当 UE处于空闲态时, 挂起下行 CS业务触发的 CS回落流程; 请求 模块, 用于请求 UE进入连接态, 并请求 UE发起联合位置更新流程, 以使 UE完成在 CS域的注册; 通知模块, 用于在 UE完成在 CS域的注册之后, 通知 UE执行下行 CS业务触发的 CS回落流程。
结合第二方面, 在第二方面的第一种可能的实现方式中, 接收模块接收 到的通知消息为第一寻呼请求消息, MME还包括: 緩存模块, 用于緩存第 一寻呼请求消息, 其中, 处理模块具体用于挂起第一寻呼请求消息触发的 CS回落流程。
结合第二方面的第一种可能的实现方式,在第二方面的第二种可能的实 现方式中, 请求模块具体用于向 UE发送空口寻呼消息, 空口寻呼消息包括 的核心网 CN域为 CS域, 接收模块还用于接收 UE根据该空口寻呼消息发 送的扩展业务请求消息。
结合第二方面的第二种可能的实现方式,在第二方面的第三种可能的实 现方式中, MME还包括: 第一定时模块, 用于在接收模块接收 UE发送的 扩展业务请求消息之后, 启动第一定时器, 其中, 通知模块具体用于, 在 UE 完成在 CS 域的注册之后、 第一定时器超时之前, 接收模块接收到 MSC/VLR发送的第二寻呼请求消息时, 通知 UE执行第二寻呼请求消息触 发的 CS回落流程,第二寻呼请求消息用于指示 MME针对 UE的下行 CS业 务,第二寻呼请求消息包括 UE的国际移动用户标识 IMSI和位置区标识 LAI; 或者, 通知模块具体用于, 在 UE完成在 CS域的注册之后、 第一定时器超 时时,通知 UE执行处理模块挂起的第一寻呼请求消息触发的 CS回落流程。 结合第二方面的第二种可能的实现方式,在第二方面的第四种可能的实 现方式中, 请求模块还用于, 在接收模块接收 UE发送的扩展业务请求消息 之后, 向演进型节点 B eNodeB发送初始上下文建立请求消息, 初始上下文 建立请求消息不包括电路交换回落 CSFB指示信息。
结合第二方面的第一种可能的实现方式,在第二方面的第五种可能的实 现方式中, 请求模块具体用于向 UE发送空口寻呼消息, 空口寻呼消息包括 的 CN域为分组交换 PS域, 接收模块还用于接收 UE根据该空口寻呼消息 发送的业务请求消息。
结合第二方面的第四种或第五种可能的实现方式,在第二方面的第六种 可能的实现方式中, MME还包括: 第二定时模块, 用于在 UE完成在 CS域 的注册之后, 启动第二定时器, 其中, 通知模块具体用于, 在 UE完成在 CS 域的注册之后、 第二定时器超时之前, 接收模块接收到 MSC/VLR发送的第 二寻呼请求消息时, 通知 UE执行第二寻呼请求消息触发的 CS回落流程, 其中第二寻呼请求消息用于指示 MME针对 UE的下行 CS业务, 第二寻呼 请求消息包括 UE的 IMSI和 LAI; 或者, 通知模块具体用于, 在 UE完成在 CS域的注册之后、 第二定时器超时时, 通知 UE执行处理模块挂起的第一 寻呼请求消息触发的 CS回落流程。
结合第二方面或第二方面的第一种至第六种可能的实现方式中的任一 种可能的实现方式, 在第二方面的第七种可能的实现方式中, 请求模块具体 用于, 向 UE发送分离请求消息, 分离请求消息用于请求 UE发起联合位置 更新流程, 分离请求消息中包括的分离类型为 IMSI分离。
结合第二方面或第二方面的第一种至第七种可能的实现方式中的任一 种可能的实现方式, 在第二方面的第八种可能的实现方式中, 通知模块具体 用于, 向 UE发送 CS业务通知消息, 以使 UE执行下行 CS业务触发的 CS 回落流程。
基于上述技术方案, MME接收 MSC/VLR重启后发送的针对 UE的下 行 CS业务的通知消息后, 当 UE处于空闲态时, MME通过挂起该下行 CS 业务触发的 CS回落流程, 能够使 UE优先完成在 CS域的注册, 然后通知 UE执行该下行 CS业务触发的 CS回落流程, 从而能够避免 UE与网络侧的 流程冲突处理。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对本发明实施例中 所需要使用的附图作简单地介绍, 显而易见地, 下面所描述的附图仅仅是本 发明的一些实施例, 对于本领域普通技术人员来讲, 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示出了根据本发明实施例的处理下行电路交换 CS业务的方法的示 意性流程图。
图 2示出了根据本发明另一实施例的处理下行电路交换 CS业务的方法 的示意性流程图。
图 3示出了根据本发明另一实施例的处理下行电路交换 CS业务的方法 的示意性流程图。
图 4示出了根据本发明另一实施例的处理下行电路交换 CS业务方法的 示意性流程图。
图 5示出了根据本发明实施例的移动管理实体的示意性框图。
图 6示出了根据本发明另一实施例的移动管理实体的示意性框图。 具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例是本发明的一部分实施例, 而不 是全部实施例。 基于本发明中的实施例, 本领域普通技术人员在没有做出创 造性劳动的前提下所获得的所有其他实施例, 都应属于本发明保护的范围。
在本发明实施例中, 用户设备 UE ( User Equipment )可以为以下任意一 种, 并且用户设备可以是静态的, 也可以是移动的。 用户设备可以包括但不 限于: 站台( Station )、移动台( Mobile Station )、用户单元( Subscriber Unit )、 个人电月禽 ( Personal Computer ). 膝上型电月禽 ( Laptop Computer ). 平板电月亩 ( Tablet Computer )、上网本 (Netbook)、终端( Terminal )、蜂窝电话( Cellular Phone )、 手持设备( Handheld )、 无绳电话( Cordless Phone )、 个人数字助理 ( Personal Digital Assistant, 简称 PDA )、 数据卡( Data Card )、 USB插入设 备、 移动 WiFi热点设备(MiFi Devices ), 智能手表、 智能眼镜、 无线调制 解调器( Modem )、 无线路由器、 无线本地环路( Wireless Local Loop, 简称 WLL )台等。上述用户设备可以分布于整个无线网络中。移动交换中心 MSC 与拜访位置寄存器 VLR通常合设为同一网元, 称为 MSC/VLR, 或简称为 VLR。
图 1示出了根据本发明一个实施例的处理下行电路交换 CS业务的方法 100的示意性流程图, 方法 100由移动管理实体 MME执行。 如图 1所示, 方法 100包括如下内容。
110、 MME接收移动业务交换中心 /拜访位置寄存器 MSC/VLR重启后发 送的通知消息, 该通知消息用于指示该 MME针对用户设备 UE 的下行 ( Mobile Terminating , 简称 MT ) 电路交换 CS业务。
应理解, 在 110之前, UE已经发起过联合附着流程和联合位置更新流 程, 在 EPC网络 PS域和 2G/3G网络的 CS域成功联合注册。 然后, UE注 册的 MSC/VLR复位重启,该 MSC/VLR在复位重启后接到了 UE的下行 CS 业务请求, 则向所有与该 MSC/VLR有 SGs接口的 MME发送通知消息。 应 理解, MSC/VLR重启后会向所有与其有 SGs接口连接的 MME发送复位指 示消息, MME在接收到复位指示消息后标记该 MSC/VLR不可靠, 换句话 说, MME能够获知 MSC/VLR复位重启。
120、 当 UE处于空闲态时, MME挂起该下行 CS业务触发的 CS回落 流程。
130、 MME请求该 UE进入连接态。
140、 MME请求该 UE发起联合位置更新流程, 以使该 UE完成在 CS 域的注册。
换句话说, 当该 UE处于空闲态时,要先使得 UE由空闲态进入连接态, 然后再请求 UE发起联合位置更新流程。
150、 在 UE完成在该 CS域的注册之后, MME通知该 UE执行该下行 CS业务触发的 CS回落流程。
MME在收到 UE发送的联合位置更新请求消息时, MME需要执行流程 冲突处理, 即: 在扩展业务请求流程未完成之前, 又收到了联合位置更新请 求。 对于 UE侧, UE也需要执行流程冲突处理, 即: 在当前扩展业务请求 流程未完成之前, 又收到 MME发送的分离请求消息。
在这种情况下: 如果 MME优先请求 eNodeB执行 CSFB回落流程, 则 存在 UE在 MME发起分离流程之前就回落到 2G/3G网络, 导致 UE无法接 收到后续 MME发送的分离请求消息; 如果 MME优先发起分离流程, 即不 向 eNodeB发送携带有 CSFB指示的消息, 则在扩展业务请求流程中没有建 立对应的空口承载, 后续在完成 CS业务重新注册后, 在 MSC/VLR重新发 起的下行 CSFB流程中, MME仍然需要 eNodeB建立空口承载, 而不能直 接执行连接态的下行 CSFB流程; 如果 MME并行执行扩展业务请求流程与 分离流程, 可能出现 UE在联合位置更新流程完成之前就回落到 2G/3G, 导 致当前的联合位置更新流程与后续 MSC/VLR重新发起的下行 CSFB流程异 常甚至失败, 并造成不必要的信令开销; 如果 MME并行执行扩展业务请求 流程与分离流程, 则同时在 UE侧与 MME侧发生流程冲突, 造成 UE侧与 MME侧实现的复杂性。
因此, 本发明实施例的处理下行 CS业务的方法, MME接收 MSC/VLR 重启后发送的针对 UE的下行 CS业务的通知消息后, 当 UE处于空闲态时, MME通过挂起该下行 CS业务触发的 CS回落流程, 能够使 UE优先完成在 CS域的注册, 然后通知 UE执行该下行 CS业务触发的 CS回落流程, 从而 能够避免 UE与网络侧的流程冲突处理。
具体地, 作为另一实施例, 110中的通知消息为第一寻呼请求消息, 方 法 100还包括: MME緩存该第一寻呼请求消息, 其中, 该挂起该下行 CS 业务触发的 CS回落流程, 包括: 挂起该第一寻呼请求消息触发的 CS回落 流程。
应理解, 该第一寻呼请求消息用来指示 MME针对 UE的下行电路交换
CS业务, 该第一寻呼请求消息中包含有该下行 CS业务的指示信息。 由于该 MSC/VLR复位重启, 该第一寻呼请求消息中包括 UE的国际移动用户标识 ( International Mobile Subscriber Identity, 简称 IMSI ), 但不包括 UE的位置 区标识( Location Area Identifier, 简称 LAI )。 MME接收到 MSC/VLR发送 的该第一寻呼请求消息时, 当 UE处于空闲态时, MME首先要请求 UE进 入连接态, 同时还要请求 UE发起联合位置更新流程, 以完成在 CS域的注 册, 为了避免流程冲突, MME挂起该第一寻呼请求消息触发的 CS 回落流 程, 并緩存该第一寻呼请求消息, 以便使 UE优先完成在 CS域的注册之后 再执行该第一寻呼请求消息触发的 CS回落流程。
具体地, 作为另一实施例, 在 130中包括: MME向 UE发送空口寻呼 消息, 空口寻呼消息包括的核心网 CN域为 CS域, 方法 100还包括: MME 接收 UE 根据该空口寻呼消息发送的扩展业务请求 ( Extended Service Request ) 消息。
扩展业务请求消息可以用于 UE发起 CS回落流程, 此处扩展业务请求 消息作为对空口寻呼消息的响应消息。
相应地, 在 MME接收 UE发送的扩展业务请求消息之后, 方法 100还 包括: MME启动第一定时器, 具体地, 150包括: 150a, 在 UE完成在 CS 域的注册之后、 该第一定时器超时之前, MME接收到 MSC/VLR发送的第 二寻呼请求消息时,通知 UE执行该第二寻呼请求消息触发的 CS回落流程, 其中该第二寻呼请求消息用于指示 MME针对 UE的该下行 CS业务, 该第 二寻呼请求消息包括 UE的 IMSI和 LAI; 或者, 150b、 在 UE完成在 CS域 的注册之后、 该第一定时器超时时, MME通知 UE执行挂起的该第一寻呼 请求消息触发的 CS回落流程。
该第二寻呼请求消息中包含有该下行 CS业务的指示信息, 并且该第二 寻呼请求消息是由 MSC/VLR在 UE完成在 CS域的注册之后发送的。
具体地, 在 UE完成在 CS域的注册之后、 该第一定时器超时之前, 如 果 MME接收到 MSC/VLR发送的第二寻呼请求消息, 那么 MME可以通知 UE执行第二寻呼请求消息触发的 CS回落流程。 此外, MME还可以停止该 第一定时器, 删除緩存的第一寻呼请求消息, 终止挂起的该第一寻呼请求消 息触发的 CS回落流程。
在 UE完成在 CS域的注册之后、 该第一定时器超时时, 如果 MME没 有收到 MSC/VLR发送的第二寻呼请求消息, 那么 MME通知 UE执行之前 緩存的第一寻呼请求消息触发的 CS回落流程。 然后 MME可以删除緩存的 第一寻呼请求消息。
应理解, 作为另一实施例, 在 MME接收 UE根据该空口寻呼消息发送 的扩展业务请求消息之后,方法 100中 MME可以不启动第一定时器, MME 可以在 UE完成在 CS域的注册后, 马上通知 UE执行挂起的该第一寻呼请 求消息触发的 CS回落流程, 并删除緩存的第一寻呼请求消息。
作为另一实施例, 在 130之后, 方法 100还包括: MME向演进型节点 B ( evolved NodeB ,简称 eNodeB )发送初始上下文建立( Initial Context Setup ) 请求消息, 该初始上下文建立请求消息不包括 CSFB指示信息。
该 MME向 eNodeB发送的初始上下文建立请求消息中不包括 CSFB指 示信息, 则 eNodeB不会继续 CSFB流程, 从而保证了 UE优先完成到 CS 域的重新注册。需要说明的是,该重新注册是相对于 110之前 UE已经在 EPC 网络 PS域和 2G/3G网络的 CS域成功联合注册所说的, 相当于又一次实现 了在该 CS域的注册。
可替代地, 作为另一实施例, 在 130中包括: MME向 UE发送空口寻 呼消息, 该空口寻呼消息包括的 CN域为分组交换( Packet Switched, 简称 PS )域, 方法 100还包括: MME接收 UE根据该空口寻呼消息发送的业务 请求 ( Service Request ) 消息。
由于空口寻呼消息中的 CN域为 PS域, 那么 UE可以发起正常的业务 请求, 而非扩展业务请求消息。 业务请求消息可以作为对空口寻呼消息的响 应消息。
相应地, 在 UE完成在 CS域的重新注册之后, 方法 100还包括: MME 启动第二定时器, 相应地, 在 150中包括: 150c、 在 UE完成在 CS域的注 册之后、 该第二定时器超时之前, MME接收到 MSC/VLR发送的第二寻呼 请求消息时, 通知 UE执行该第二寻呼请求消息触发的 CS回落流程, 其中 该第二寻呼请求消息用于指示 MME针对 UE的该下行 CS业务, 该第二寻 呼请求消息包括该 UE的 IMSI和 LAI; 或者, 150d、 在 UE完成在 CS域的 注册之后、 该第二定时器超时时, MME通知 UE执行挂起的第一寻呼请求 消息触发的 CS回落流程。
该第二寻呼请求消息中包含有该下行 CS业务的指示信息, 并且该第二 寻呼请求消息是由 MSC/VLR在 UE完成在 CS域的注册之后发送的。
具体而言, 在该第二定时器超时之前, 如果 MME接收到 MSC/VLR发 送的第二寻呼请求消息, 则可以通知 UE执行第二寻呼请求消息触发的 CS 回落流程。 同时, MME可以停止该第二定时器, 删除緩存的第一寻呼请求 消息。
在第二定时器超时时, 如果 MME未接收到 MSC/VLR发送的第二寻呼 请求消息, 那么可以通知 UE执行所緩存的第一寻呼请求消息触发的 CS回 落流程。 同时, MME可以从緩存中删除第一寻呼请求消息。
应理解,作为另一实施例,方法 100中 MME还可以不启动第二定时器, MME可以在 UE完成在 CS域的注册后, 马上通知 UE执行挂起的该第一寻 呼请求消息触发的 CS回落流程, 并删除緩存的第一寻呼请求消息。 具体地, 作为另一实施例, 在 140中, MME向 UE发送分离请求消息, 该分离请求消息用于请求 UE发起联合位置更新流程, 该分离请求消息中包 括的分离类型为 IMSI分离。
具体地,作为另一实施例,在 150中, MME向 UE发送 CS业务通知( CS Service Notification ) 消息, 以使 UE执行下行 CS业务触发的 CS回落流程。
因此, 本发明实施例的处理下行电路交换 CS业务的方法, MME接收 MSC/VLR重启后发送的针对 UE的下行 CS业务的通知消息后, 当 UE处于 空闲态时, MME通过挂起该下行 CS业务触发的 CS回落流程, 能够使 UE 优先完成在 CS域的注册, 然后通知 UE执行该下行 CS业务触发的 CS回落 流程, 从而能够避免 UE与网络侧的流程冲突处理。
下面结合图 2至图 4详细描述根据本发明实施例的处理下行 CS业务的 方法。
图 2示出了根据本发明实施例的处理下行电路交换 CS业务的方法 200 的示意性流程图。 方法 200为方法 100的例子, 如图 2所示, 处理下行 CS 业务的方法 200包括如下内容。
201、 UE发起联合附着流程或联合位置更新流程, 在 EPC网络 PS域与 2G/3G网络 CS域成功联合注册。
202、 UE注册的 MSC/VLR复位重启。
203、 该 MSC/VLR复位重启后, 接收到该 UE的下行 CS业务请求, 则 向所有与该 MSC/VLR有 SGs接口的 MME发送 SGs寻呼请求消息并为每个
MME启动一个寻呼定时器,该 SGs寻呼消息中包含该 UE的身份标识 IMSI, 但是没有包含 UE的位置信息标识 LAI。 需要说明的是, MSC/VLR重启后 会向所有与其有 SGs接口连接的 MME发送复位指示消息, MME在接收到 复位指示消息后标记该 MSC/VLR不可靠。
204a, 该 UE注册的 MME在收到未包含 LAI的 SGs寻呼请求消息后, 当该 UE处于空闲态时, MME挂起该 SGs寻呼请求消息触发的 CS回落流 程, 并緩存该 SGs寻呼请求消息。
204b、 该 MME向该 UE发起空口寻呼, 即向该 UE发送寻呼请求消息,
MME将寻呼消息的 CN域设置为 "PS "。
205、 UE向该 MME发起正常业务请求(Service Request ) 流程作为寻 呼响应。 206a, 该 MME执行该正常业务请求流程, 使得 UE从空闲态变为连接 态。
206b , 在 UE进入连接态后, 该 MME向 UE发送分离请求消息, 发起 分离类型为 "IMSI分离" 的分离流程以触发 UE发起 CS业务恢复流程。
应理解, 该 MME可以同时执行 206a和 206b, 也可以先执行 206a再执 行 206b,还可以先执行 206b再执行 206a。需要说明的是,通过执行步骤 206a 的发起过程, 使得 UE从空闲态变为连接态, 表明 UE与 MME之间已经建 立了底层链路。
207、 UE发起联合位置更新流程, 即发送更新类型为 "联合 TA/ LA并 IMSI附着" 的联合位置更新请求消息给 MME。
该 MME按照现有技术执行并完成该联合位置更新流程, 实现该 UE在 CS 域的重新注册。 应理解, 在本发明实施例中, 该联合位置更新流程具体 可以为联合跟踪域更新( Tracking Area Update, 简称 TAU )流程。还应理解, 在本发明实施例中, UE在收到 IMSI分离请求消息后, 可以回复分离接受消 息给 MME, MME在接收到该分离接受消息后, 保持底层链路不释放, 即保 持 UE处于连接态, 以保证该联合位置更新流程成功执行。
208、 MME启动一定时器, 同时保持该底层链路不释放, 即保持 UE与 MME处于连接态。
209、 MSC/VLR在完成 UE到 CS域的注册后, 即完成了 MME发起的 SGs接口位置更新流程, 若在 203中启动的寻呼定时器未超时, 则重新发起 到该 MME 的 SGs 寻呼请求消息, 此时, 因为 UE 已经恢复了到该重启 MSC/VLR的 CS注册, 故重新发送的 SGs寻呼请求消息中包含了 UE的位 置信息 LAI。
210a,若 MME在 208a中启动的定时器超时之前收到 MSC/VLR发送的 包含有 LAI的 SGs寻呼请求消息, 则停止该定时器, 并清除 204a中緩存的 未包含 LAI的 SGs寻呼请求消息, 执行 210b; 210b , MME利用已有底层链 路向 UE发起 CS业务通知( CS Service Notification )消息, 以继续当次的下 行 CSFB流程。
或者
210c, 在 208a中启动的该定时器超时时, 该 MME根据 204a中緩存的 未包含 LAI的 SGs寻呼请求消息, 执行 210d, 并清除緩存的该 SGs寻呼请 求消息; 210d、 MME直接利用已有底层链路向 UE发起 CS业务通知( CS Service Notification ) 消息, 以恢复 204a中挂起的下行 CSFB流程。
需要说明的是, 210a和 210b两个步骤与 210c和 210d两个步骤是互斥 的, MME执行 210a和 210b就不执行 210c和 210d, 反之亦然。
因此, 本发明实施例的处理下行电路交换 CS业务的方法, MME接收
MSC/VLR重启后发送的针对 UE的下行 CS业务的通知消息后, 当 UE处于 空闲态时, MME通过挂起该下行 CS业务触发的 CS回落流程, 能够使 UE 优先完成在 CS域的注册, 然后通知 UE执行该下行 CS业务触发的 CS回落 流程, 从而能够避免 UE与网络侧的流程冲突处理。
图 3示出了根据本发明另一实施例的处理下行 CS业务的方法 300, 方 法 300为方法 100的例子, 如图 3所示, 处理下行 CS业务的方法 300包括 如下内容。
301、 UE发起联合附着流程或联合位置更新流程, 在 EPC网络 PS域与 2G/3G网络 CS域成功联合注册。
302、 UE注册的 MSC/VLR复位重启。
303、 该 MSC/VLR重启后, 接收到该 UE的下行 CS业务请求, 则向所 有与该 MSC/VLR有 SGs接口的 MME发送 SGs寻呼请求消息并为每个 MME 启动一个寻呼定时器, 该 SGs寻呼消息中包含该 UE的身份标识 IMSI, 但 是没有包含 UE的位置信息标识 LAI。 需要说明的是, MSC/VLR重启后会 向所有与其有 SGs接口连接的 MME发送复位指示消息, MME在接收到复 位指示消息后标记该 MSC/VLR不可靠。
304a, UE注册的 MME在收到未包含 LAI的 SGs寻呼请求消息后, 当 该 UE处于空闲态时, MME挂起该 SGs寻呼请求消息触发的 CS回落流程, 并緩存该 SGs寻呼请求消息。
304b ,向该 UE发起空口寻呼, MME将寻呼消息的 CN域设置为 "CS"。
305、 UE向该 MME发起扩展业务请求(Extended Service Request ) 流 程作为寻呼响应。 该扩展业务请求流程使得 UE从空闲态变为连接态, UE 从空闲态变为连接态时, 表明 UE与 MME之间已经建立了底层链路。
306a,该 MME若緩存有未包含 LAI的 SGs寻呼请求消息, 则启动一个 定时器。
306b, 在 UE进入连接态后, 该 MME向 UE发起分离类型为 "IMSI分 离" 的分离流程以触发 UE发起 CS业务恢复流程。
应理解, 该定时器的时长保证能够完成后续整个联合位置更新流程。 还 应理解,该 MME可以同时执行 306a和 306b,也可以先执行 306a再执行 306b, 还可以先执行 306b再执行 306a。
307、 UE发起联合位置更新流程, 即发送更新类型为 "联合 TA/ LA并
IMSI附着" 的联合位置更新请求消息给 MME。 MME按照现有技术执行并 完成该联合位置更新流程, 实现该 UE在 CS域的重新注册。 应理解, 在本 发明实施例中, 该联合位置更新流程具体可以为 TAU流程。 还应理解, 在 本发明实施例中, UE在收到 IMSI分离请求消息后, 可以回复分离接受消息 给 MME, MME在接收到该分离接受消息后, 保持底层链路不释放, 即保持 UE处于连接态, 以保证该联合位置更新流程成功执行。
308、 MME保持该底层链路不释放, 即保持 UE与 MME处于连接态。
309、 MSC/VLR在完成 UE到 CS域注册后,即完成了 MME发起的 SGs 接口位置更新流程, 若在 303中启动的寻呼定时器未超时, 则重新发起到该 MME的 SGs寻呼请求消息,此时, 因为 UE已经恢复了到该重启 MSC/VLR 的 CS注册,故重新发送的 SGs寻呼请求消息中包含了 UE的位置信息 LAI。
310a,若 MME在 306a启动的定时器超时之前收到 MSC/VLR发送的包 含有 LAI的 SGs寻呼请求消息, 则停止该定时器, 并清除 304a中緩存的未 包含 LAI的 SGs寻呼请求消息, 执行 310b; 310b , MME利用已有底层链路 向 UE发起 CS业务通知消息, 以继续当次的下行 CSFB流程。
或者
310c, 在 306a启动的定时器超时时, 根据 304a中緩存的未包含 LAI的 SGs寻呼请求消息, 执行 310d, 并清除緩存的该 SGs寻呼请求消息; 310d、 MME直接利用已有底层链路向 UE发起 CS业务通知消息, 以恢复 304a中 挂起的下行 CSFB流程。
需要说明的是, 310a和 310b两个步骤与 310c和 310d两个步骤是互斥 的, MME执行 310a和 310b就不执行 310c和 310d, 反之亦然。
因此, 本发明实施例的处理下行电路交换 CS业务的方法, MME接收 MSC/VLR重启后发送的针对 UE的下行 CS业务的通知消息后, 当 UE处于 空闲态时, MME通过挂起该下行 CS业务触发的 CS回落流程, 能够使 UE 优先完成在 CS域的注册, 然后通知 UE执行该下行 CS业务触发的 CS回落 流程, 从而能够避免 UE与网络侧的流程冲突处理。
图 4示出了根据本发明另一实施例的处理下行 CS业务的方法 400, 方 法 400为方法 100的例子, 如图 4所示, 处理下行 CS业务的方法 400包括 如下内容。
401、 UE发起联合附着流程或联合位置更新流程, 在 EPC网络 PS域与
2G/3G网络 CS域成功联合注册。
402、 UE注册的 MSC/VLR复位。
403、 该 MSC/VLR重启后, 接收到该 UE的下行 CS语音业务请求, 则 向所有与该 MSC/VLR有 SGs接口的 MME发送 SGs寻呼请求消息并为每个 MME启动一个寻呼定时器,该 SGs寻呼消息中包含该 UE的身份标识 IMSI, 但是没有包含 UE的位置信息标识 LAI。 需要说明的是, MSC/VLR重启后 会向所有与其有 SGs接口连接的 MME发送复位指示消息, MME在接收到 复位指示消息后标记该 MSC/VLR不可靠。
404a, 该 UE注册的 MME在收到未包含 LAI的 SGs寻呼请求消息后, 当该 UE处于空闲态时, MME挂起该 SGs寻呼请求消息触发的 CS回落流 程, 并緩存该 SGs寻呼请求消息。
404b、该 MME向该 UE发起空口寻呼, MME将寻呼消息的 CN域设置 为 "CS"。
405、 UE向该 MME发起扩展业务请求流程作为寻呼响应。 该扩展业务 请求流程使得 UE从空闲态变为连接态, UE从空闲态变为连接态时, 表明 UE与 MME之间已经建立了底层链路。
406a, MME收到扩展业务请求消息后照常执行该扩展业务请求流程, 若该 MME緩存有未包含 LAI的 SGs寻呼请求消息, 执行 406b。
406b、 该 MME向 eNodeB发送初始上下文建立 ( Initial Context Setup ) 请求消息, 该初始上下文建立请求消息不包括 CSFB指示信息, 需要说明的 是, 该 MME在 406b中不向 eNodeB发送 CSFB指示信息, 相当于 MME将 当前的扩展业务请求流程转变成了正常业务请求流程来执行。
406c、 MME向 UE发起分离类型为 "IMSI分离"的分离流程以触发 UE 发起 CS业务恢复流程。
应理解, 该 MME可以同时执行 406b和 406c, 也可以先执行 406b再执 行 406c, 还可以先执行 406c再执行 406b。 407、 UE发起联合位置更新流程, 即发送更新类型为 "联合 TA/ LA并 IMSI附着" 的联合位置更新请求消息给 MME。 该 MME按照现有技术执行 并完成该联合位置更新流程, 实现该 UE在 CS域的重新注册。 应理解, 在 本发明实施例中, 该联合位置更新流程具体可以为 TAU流程。 还应理解, 在本发明实施例中, UE在收到 IMSI分离请求消息后, 可以回复分离接受消 息给 MME, MME在接收到该分离接受消息后, 保持底层链路不释放, 即保 持 UE处于连接态, 以保证该联合位置更新流程成功执行。
408、 MME启动一定时器, 同时保持该底层链路不释放, 即保持 UE与 MME处于连接态。
409、 MSC/VLR在完成 UE到 CS域注册后,即完成了 MME发起的 SGs 接口位置更新流程, 若在 403中启动的寻呼定时器未超时, 则重新发起到该 MME的 SGs寻呼请求消息,此时, 因为 UE已经恢复了到该重启 MSC/VLR 的 CS注册,故重新发送的 SGs寻呼请求消息中包含了 UE的位置信息 LAI。
410a, 若 MME在 408启动的定时器超时之前收到 MSC/VLR发送的包 含有 LAI的 SGs寻呼请求消息, 则停止该定时器, 并清除 404a中緩存的未 包含 LAI的 SGs寻呼请求消息, 执行 410b; 410b , MME利用已有底层链路 向 UE发起 CS业务通知消息, 以继续当次的下行 CSFB流程。
或者
410c,在 408启动的定时器超时时,该 MME根据 404a中緩存的未包含 LAI的 SGs寻呼请求消息, 执行 410d, 并清除緩存的该 SGs寻呼请求消息; 410d、 MME直接利用已有底层链路向 UE发起 CS业务通知消息, 以恢复 404a中挂起的下行 CSFB流程。
需要说明的是, 410a和 410b两个步骤与 410c和 410d两个步骤是互斥 的, MME执行 410a和 410b就不执行 410c和 410d, 反之亦然。
应注意, 图 2至图 4所示的例子是为了帮助本领域技术人员更好地理解 本发明实施例, 而非要限制本发明实施例的范围。 本领域技术人员根据所给 出的图 2至图 4的的例子, 显然可以进行各种等价的修改或变化, 这样的修 改或变化也落入本发明实施例的范围内。
应理解, 上述各过程的序号的大小并不意味着执行顺序的先后, 各过程 的执行顺序应以其功能和内在逻辑确定, 而不应对本发明实施例的实施过程 构成任何限定。 因此, 本发明实施例的处理下行电路交换 CS业务的方法, MME接收 MSC/VLR重启后发送的针对 UE的下行 CS业务的通知消息后, 当 UE处于 空闲态时, MME通过挂起该下行 CS业务触发的 CS回落流程, 能够使 UE 优先完成在 CS域的注册, 然后通知 UE执行该下行 CS业务触发的 CS回落 流程, 从而能够避免 UE与网络侧的流程冲突处理。
上文结合图 1至图 4详细描述了根据本发明实施例的处理下行电路交换 业务的方法, 下面结合图 5至图 6详细描述根据本发明实施例的移动管理实 体。 如图 5所示, 移动管理实体 MME 500包括: 接收模块 510、 处理模块 520、 请求模块 530和通知模块 540。
接收模块 510, 用于接收移动业务交换中心 /拜访位置寄存器 MSC/VLR 重启后发送的通知消息, 该通知消息用于指示该 MME针对用户设备 UE的 下行电路交换 CS业务。
处理模块 520, 用于当该 UE处于空闲态时, 挂起该下行 CS业务触发 的 CS回落流程。
请求模块 530, 用于请求该 UE进入连接态, 还用于请求该 UE发起联 合位置更新流程, 以使该 UE完成在 CS域的注册。
通知模块 540, 用于在该 UE完成在该 CS域的注册之后, 通知该 UE执 行该下行 CS业务触发的 CS回落流程。
因此, 本发明实施例的移动管理实体, 接收 MSC/VLR重启后发送的针 对 UE的下行 CS业务的通知消息后, 当 UE处于空闲态时, 通过挂起该下 行 CS业务触发的 CS回落流程, 能够使 UE优先完成在 CS域的注册, 然后 通知 UE执行该下行 CS业务触发的 CS回落流程,从而能够避免 UE与网络 侧的流程冲突处理。
具体地, 接收模块 510接收到的通知消息为第一寻呼请求消息, MME 500还包括: 緩存模块 550, 用于緩存该第一寻呼请求消息, 其中挂起模块 520具体用于挂起该第一寻呼请求消息触发的 CS回落流程。
具体地, 作为另一实施例, 请求模块 530具体用于向 UE发送空口寻呼 消息, 该空口寻呼消息包括的核心网 CN域为 CS域, 接收模块 510还用于 接收该 UE根据该空口寻呼消息发送的扩展业务请求消息。 可选地, 作为另一实施例, MME 500还包括: 第一定时模块, 用于在 接收模块 510接收 UE发送的该扩展业务请求消息之后, 启动第一定时器。
通知模块 540具体用于: 在 UE完成在该 CS域的注册之后、 该第一定 时器超时之前, 接收到该 MSC/VLR发送的第二寻呼请求消息时, 通知该 UE执行该第二寻呼请求消息触发的 CS 回落流程, 其中该第二寻呼请求消 息用于指示该 MME针对该 UE的该下行 CS业务, 该第二寻呼请求消息包 括该 UE的国际移动用户标识 IMSI和位置区标识 LAI。
或者, 通知模块 540具体用于在 UE完成在 CS域的注册之后、 该第一 定时器超时时, 通知 UE执行处理模块 520挂起的第一寻呼请求消息触发的 CS回落流程。
具体地, 如果在 UE完成在该 CS域的注册之后、 该第一定时器超时之 前, 接收模块 510接收到了 MSC/VLR发送的第二寻呼请求消息, 则处理模 块 520通知 UE执行该第二寻呼请求消息触发的 CS回落流程。 此外, 处理 模块 520还可以停止第一定时模块启动的第一定时器,删除緩存模块 550緩 存的该第一寻呼请求消息, 终止挂起的该第一寻呼请求消息触发的 CS回落 流程。
如果在 UE完成在该 CS域的注册之后、 该第一定时器超时时, 接收模 块 510没有接收到 MSC/VLR发送的第二寻呼请求消息, 则处理模块 520通 知 UE执行处理模块 520挂起的第一寻呼请求消息触发的 CS回落流程。 然 后, 处理模块 520还可以删除緩存模块 550緩存的该第一寻呼请求消息。
具体地, 作为另一实施例, 请求模块 530还用于, 在接收模块 510接收 该 UE发送的该扩展业务请求消息之后, 向演进型节点 B eNodeB发送初始 上下文建立请求消息, 该初始上下文建立请求消息不包括 CSFB指示信息。
可替代地, 作为另一实施例, 请求模块 530具体用于向 UE发送空口寻 呼消息, 该空口寻呼消息包括的 CN域为 PS域, 接收模块 510还用于接收 该 UE根据该空口寻呼消息发送的业务请求消息。
具体地, 在本发明实施例中, 移动管理实体 500还可以包括: 第二定时 模块, 用于在 UE完成在 CS域的注册之后, 启动第二定时器。
通知模块 540具体用于: 在 UE完成在 CS域的注册之后、 该第二定时 器超时之前, 接收到 MSC/VLR发送的第二寻呼请求消息时, 通知该 UE执 行该第二寻呼请求消息触发的 CS回落流程, 其中该第二寻呼请求消息用于 指示该 MME针对该 UE的该下行 CS业务,该第二寻呼请求消息包括该 UE 的 IMSI和 LAI。
或者, 通知模块 540具体用于在 UE完成在 CS域的注册之后、 第二定 时器超时时, 通知该 UE执行处理模块 520挂起的该第一寻呼请求消息触发 的 CS回落流程。
具体地, 如果在 UE完成在该 CS域的注册之后、 该第二定时器超时之 前, 接收模块 510接收到了 MSC/VLR发送的第二寻呼请求消息, 则通知模 块 540通知 UE执行该第二寻呼请求消息触发的 CS回落流程。 此外, 处理 模块 520还用于停止第二定时模块启动的第二定时器,删除緩存模块 550緩 存的第一寻呼请求消息。
如果在 UE完成在该 CS域的注册之后、 该第二定时器超时时, 接收模 块 510没有接收到 MSC/VLR发送的第二寻呼请求消息, 通知模块 540通知 UE执行处理模块 520挂起的第一寻呼请求消息触发的 CS回落流程。 然后, 处理模块 520还可以删除緩存模块 550緩存的该第一寻呼请求消息。
具体地, 作为另一实施例, 请求模块 530具体用于向 UE发送分离请求 消息, 该分离请求消息用于请求 UE发起联合位置更新流程, 该分离请求消 息中包括的分离类型为 IMSI分离。
具体地, 作为另一实施例, 通知模块 540具体用于向 UE发送 CS业务 通知消息, 以使该 UE执行下行 CS业务触发的 CS回落流程。 施例的处理下行 CS业务的方法 100中的移动管理实体, 并且移动管理实体
500中的各个模块的上述和其它操作和 /或功能分别为了实现图 1所示的方法
100的相应流程, 为了简洁, 在此不再赘述。
因此, 本发明实施例的移动管理实体, 接收 MSC/VLR重启后发送的针 对 UE的下行 CS业务的通知消息后, 当 UE处于空闲态时, 通过挂起该下 行 CS业务触发的 CS回落流程, 能够使 UE优先完成在 CS域的注册, 然后 通知 UE执行该下行 CS业务触发的 CS回落流程,从而能够避免 UE与网络 侧的流程冲突处理。
图 6是根据本发明实施例的移动管理实体 600的示意性框图。移动管理 实体 600包括: 处理器 610、 存储器 620、 总线系统 630和收发器 640。 处理 器 610、 存储器 620和收发器 640通过总线系统 630相连, 存储器 620用于 存储指令, 处理器 610用于执行该存储器 620中存储的指令。
收发器 640用于接收移动业务交换中心 /拜访位置寄存器 MSC/VLR重启 后发送的通知消息, 该通知消息用于指示该 MME针对用户设备 UE的下行 电路交换 CS业务。 处理器 610用于当该 UE处于空闲态时, 挂起该下行 CS 业务触发的 CS回落流程。 收发器 640还用于请求该 UE进入连接态, 并请 求该 UE发起联合位置更新流程, 以使该 UE完成在 CS域的注册。 收发器 640还用于在该 UE完成在该 CS域的注册之后, 通知该 UE执行该下行 CS 业务触发的 CS回落流程。
因此, 本发明实施例的移动管理实体, 接收 MSC/VLR重启后发送的针 对 UE的下行 CS业务的通知消息后, 当 UE处于空闲态时, 通过挂起该下 行 CS业务触发的 CS回落流程, 能够使 UE优先完成在 CS域的注册, 然后 通知 UE执行该下行 CS业务触发的 CS回落流程,从而能够避免 UE与网络 侧的流程冲突处理。
应理解,在本发明实施例中,该处理器 610可以是中央处理单元( Central Processing Unit, CPU ), 该处理器 610还可以是其他通用处理器、 数字信号 处理器 (DSP )、 专用集成电路(ASIC )、 现成可编程门阵列 (FPGA )或者 其他可编程逻辑器件、 分立门或者晶体管逻辑器件、 分立硬件组件等。 通用 处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器 620可以包括只读存储器和随机存取存储器, 并向处理器 610 提供指令和数据。存储器 620的一部分还可以包括非易失性随机存取存储器。 例如, 存储器 620还可以存储设备类型的信息。
该总线系统 630除包括数据总线之外, 还可以包括电源总线、 控制总线 和状态信号总线等。 但是为了清楚说明起见, 在图中将各种总线都标为总线 系统 630。
在实现过程中, 上述方法的各步骤可以通过处理器 610中的硬件的集成 逻辑电路或者软件形式的指令完成。 结合本发明实施例所公开的方法的步骤 可以直接体现为硬件处理器执行完成, 或者用处理器中的硬件及软件模块组 合执行完成。 软件模块可以位于随机存储器, 闪存、 只读存储器, 可编程只 读存储器或者电可擦写可编程存储器、 寄存器等本领域成熟的存储介质中。 该存储介质位于存储器 620, 处理器 610读取存储器 620中的信息, 结合其 硬件完成上述方法的步骤。 为避免重复, 这里不再详细描述。 具体地, 作为另一实施例, 收发器 640接收到的通知消息为第一寻呼请 求消息。 存储器 620还用于緩存该第一寻呼请求消息。 相应地, 处理器 610 具体用于挂起该第一寻呼请求消息触发的 CS回落流程。
具体地, 作为另一实施例, 收发器 640具体用于: 向 UE发送空口寻呼 消息, 该空口寻呼消息包括的核心网 CN域为 CS域; 接收该 UE根据该空 口寻呼消息发送的扩展业务请求消息。
可选地, 作为另一实施例, 处理器 610还用于在收发器 640接收 UE发 送的扩展业务请求消息之后, 启动第一定时器。 收发器 640 具体用于: 在 UE完成在 CS域的注册之后、该第一定时器超时之前,接收到 MSC/VLR发 送的第二寻呼请求消息时, 通知该 UE执行该第二寻呼请求消息触发的 CS 回落流程,其中该第二寻呼请求消息用于指示该 MME针对该 UE的下行 CS 业务, 该第二寻呼请求消息包括该 UE的 IMSI和 LAI。
或者, 收发器 640在 UE完成在 CS域的注册之后、 该第一定时器超时 时, 通知 UE执行处理器 610挂起的该第一寻呼请求消息触发的 CS回落流 程。
具体地, 如果在 UE完成在该 CS域的注册之后、 该第一定时器超时之 前,收发器 640接收到了 MSC/VLR发送的第二寻呼请求消息,则收发器 640 通知 UE执行该第二寻呼请求消息触发的 CS回落流程。 此外, 处理器 610 还可以停止第一定时器, 删除存储器 620緩存的该第一寻呼请求消息, 终止 挂起的该第一寻呼请求消息触发的 CS回落流程。
如果在 UE完成在该 CS域的注册之后、 该第一定时器超时时, 收发器 640没有接收到 MSC/VLR发送的第二寻呼请求消息,则收发器 640通知 UE 执行处理器 610挂起的第一寻呼请求消息触发的 CS回落流程。 此外, 处理 器 610还可以删除存储器 620緩存的该第一寻呼请求消息。
具体地, 作为另一实施例, 收发器 640还用于在接收 UE发送的扩展业 务请求消息之后, 向演进型节点 B eNodeB发送初始上下文建立请求消息, 该初始上下文建立请求消息不包括 CSFB指示信息。
可替代地, 作为另一实施例, 收发器 640具体用于: 向 UE发送空口寻 呼消息, 该空口寻呼消息包括的 CN域为 PS域; 接收该 UE根据该空口寻 呼消息发送的业务请求消息。
可选地, 作为另一实施例, 处理器 610还用于在 UE完成在 CS域的注 册之后, 启动第二定时器。 收发器 640具体用于在 UE完成在该 CS域的注 册之后、 该第二定时器超时之前, 接收到 MSC/VLR发送的第二寻呼请求消 息时, 通知 UE执行该第二寻呼请求消息触发的 CS回落流程, 其中该第二 寻呼请求消息用于指示该 MME针对该 UE的下行 CS业务, 该第二寻呼请 求消息包括该 UE的 IMSI和 LAI。
或者, 收发器 640具体用于在该第二定时器超时时, 通知 UE执行处理 器 610挂起的该第一寻呼请求消息触发的 CS回落流程。
具体地, 如果在 UE完成在该 CS域的注册之后、 该第二定时器超时之 前,收发器 640接收到了 MSC/VLR发送的第二寻呼请求消息,则收发器 640 通知 UE执行该第二寻呼请求消息触发的 CS回落流程。 此外, 处理器 610 还可以停止该第二定时器, 删除存储器 620緩存的第一寻呼请求消息。
如果在 UE完成在该 CS域的注册之后、 该第二定时器超时之前, 收发 器 640没有接收到 MSC/VLR发送的第二寻呼请求消息, 则收发器 640通知 UE执行处理器 610挂起的该第一寻呼请求消息触发的 CS回落流程处理器。 此外, 处理器 610还可以删除存储器 620緩存的该第一寻呼请求消息。
具体地, 作为另一实施例, 收发器 640具体用于向 UE发送分离请求消 息, 该分离请求消息用于请求该 UE发起联合位置更新流程, 该分离请求消 息中包括的分离类型为 IMSI分离。
具体地, 作为另一实施例, 收发器 640具体用于向 UE发送 CS业务通 知消息, 以使该 UE执行下行 CS业务触发的 CS回落流程。 施例的处理下行 CS业务的方法 100中的移动管理实体, 并且移动管理实体 600中的各个模块的上述和其它操作和 /或功能分别为了实现图 1所示的方法 100的相应流程, 为了简洁, 在此不再赘述。
因此, 本发明实施例的移动管理实体, 接收 MSC/VLR重启后发送的针 对 UE的下行 CS业务的通知消息后, 当 UE处于空闲态时, 通过挂起该下 行 CS业务触发的 CS回落流程, 能够使 UE优先完成在 CS域的注册, 然后 通知 UE执行该下行 CS业务触发的 CS回落流程,从而能够避免 UE与网络 侧的流程冲突处理。
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、 或者计算机软件和电子硬件的结 合来实现。 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。 另一点, 所显示或讨论的相互之间 的耦合或直接辆合或通信连接可以是通过一些接口, 装置或单元的间接耦合 或通信连接, 可以是电性, 机械或其它的形式。 为单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或 者全部单元来实现本实施例方案的目的。
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, 也可以两个或两个以上单元集成在一 个单元中。
所述功能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。
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 想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护 范围应以所述权利要求的保护范围为准。

Claims

权利要求
1. 一种处理下行电路交换 CS业务的方法, 其特征在于, 包括: 移动管理实体 MME接收移动业务交换中心 /拜访位置寄存器 MSC/VLR 重启后发送的通知消息, 所述通知消息用于指示所述 MME针对用户设备 UE的下行电路交换 CS业务;
当所述 UE处于空闲态时, 所述 MME挂起所述下行 CS业务触发的 CS 回落流程;
所述 MME请求所述 UE进入连接态;
所述 MME请求所述 UE发起联合位置更新流程, 以使所述 UE完成在
CS域的注册;
在所述 UE完成在所述 CS域的注册之后,所述 MME通知所述 UE执行 所述下行 CS业务触发的 CS回落流程。
2. 根据权利要求 1 所述的方法, 其特征在于, 所述通知消息为第一寻 呼请求消息,
所述方法还包括:
所述 MME緩存所述第一寻呼请求消息,
其中, 所述挂起所述下行 CS业务触发的 CS回落流程, 包括: 挂起所述第一寻呼请求消息触发的 CS回落流程。
3. 根据权利要求 2所述的方法, 其特征在于, 所述 MME请求所述 UE 进入连接态, 包括:
所述 MME向所述 UE发送空口寻呼消息, 所述空口寻呼消息包括的核 心网 CN域为 CS域;
所述方法还包括:
所述 MME接收所述 UE根据所述空口寻呼消息发送的扩展业务请求消 息。
4. 根据权利要求 3所述的方法, 其特征在于, 在所述 MME接收所述 UE发送的所述扩展业务请求消息之后, 所述方法还包括:
所述 MME启动第一定时器,
其中, 在所述 UE完成在所述 CS域的注册之后, 所述 MME通知所述
UE执行所述下行 CS业务触发的 CS回落流程, 包括: 在所述 UE完成在所述 CS域的注册之后、 所述第一定时器超时之前, 所述 MME接收到所述 MSC/VLR发送的第二寻呼请求消息时,通知所述 UE 执行所述第二寻呼请求消息触发的 CS回落流程, 其中所述第二寻呼请求消 息用于指示所述 MME针对所述 UE的所述下行 CS业务, 所述第二寻呼请 求消息包括所述 UE的国际移动用户标识 IMSI和位置区标识 LAI;
或者
在所述 UE完成在所述 CS域的注册之后、 所述第一定时器超时时, 所 述 MME通知所述 UE执行挂起的所述第一寻呼请求消息触发的 CS回落流 程。
5. 根据权利要求 3所述的方法, 其特征在于, 在所述 MME接收所述
UE发送的所述扩展业务请求消息之后, 所述方法还包括:
所述 MME向演进型节点 B eNodeB发送初始上下文建立请求消息, 所 述初始上下文建立请求消息不包括电路交换回落 CSFB指示信息。
6. 根据权利要求 2所述的方法, 其特征在于, 所述 MME请求所述 UE 进入连接态, 包括:
所述 MME向所述 UE发送空口寻呼消息,所述空口寻呼消息包括的 CN 域为分组交换 PS域;
所述方法还包括:
所述 MME接收所述 UE根据所述空口寻呼消息发送的业务请求消息。
7. 根据权利要求 5或 6所述的方法, 其特征在于, 在所述 UE完成在 所述 CS域的重新注册之后, 所述方法还包括:
所述 MME启动第二定时器,
其中, 在所述 UE完成在所述 CS域的注册之后, 所述 MME通知所述 UE执行所述下行 CS业务触发的 CS回落流程, 包括:
在所述 UE完成在所述 CS域的注册之后、 所述第二定时器超时之前, 所述 MME接收到所述 MSC/VLR发送的第二寻呼请求消息时,通知所述 UE 执行所述第二寻呼请求消息触发的 CS回落流程, 其中所述第二寻呼请求消 息用于指示所述 MME针对所述 UE的所述下行 CS业务, 所述第二寻呼请 求消息包括所述 UE的 IMSI和 LAI;
或者
在所述 UE完成在所述 CS域的注册之后、 所述第二定时器超时时, 所 述 MME通知所述 UE执行挂起的所述第一寻呼请求消息触发的 CS回落流 程。
8. 根据权利要求 1至 7中任一项所述的方法, 其特征在于, 所述 MME 请求所述 UE发起联合位置更新流程包括:
所述 MME向所述 UE发送分离请求消息, 所述分离请求消息用于请求 所述 UE发起所述联合位置更新流程, 所述分离请求消息中包括的分离类型 为 IMSI分离。
9. 根据权利要求 1至 8中任一项所述的方法, 其特征在于, 所述 MME 通知所述 UE执行所述下行 CS业务触发的 CS回落流程包括:
所述 MME向所述 UE发送 CS业务通知消息,以使所述 UE执行所述下 行 CS业务触发的 CS回落流程。
10. 一种移动管理实体 MME, 其特征在于, 包括:
接收模块,用于接收移动业务交换中心 /拜访位置寄存器 MSC/VLR重启 后发送的通知消息, 所述通知消息用于指示所述 MME针对用户设备 UE的 下行电路交换 CS业务;
处理模块, 用于当所述 UE处于空闲态时, 挂起所述下行 CS业务触发 的 CS回落流程;
请求模块, 用于请求所述 UE进入连接态;
所述请求模块还用于, 请求所述 UE发起联合位置更新流程, 以使所述 UE完成在 CS域的注册;
通知模块, 用于在所述 UE完成在所述 CS域的注册之后, 通知所述 UE 执行所述下行 CS业务触发的 CS回落流程。
11. 根据权利要求 10所述的 MME, 其特征在于, 接收模块接收到的所 述通知消息为第一寻呼请求消息,
所述 MME还包括:
緩存模块, 用于緩存所述第一寻呼请求消息,
其中, 所述处理模块具体用于挂起所述第一寻呼请求消息触发的 CS回 落流程。
12. 根据权利要求 11所述的 MME, 其特征在于,
所述请求模块具体用于向所述 UE发送空口寻呼消息, 所述空口寻呼消 息包括的核心网 CN域为 CS域, 所述接收模块还用于接收所述 UE根据所述空口寻呼消息发送的扩展业 务请求消息。
13. 根据权利要求 12所述的 MME, 其特征在于, 还包括:
第一定时模块, 用于在所述接收模块接收所述 UE发送的所述扩展业务 请求消息之后, 启动第一定时器,
其中, 所述通知模块具体用于, 在所述 UE完成在所述 CS域的注册之 后、 所述第一定时器超时之前, 所述接收模块接收到所述 MSC/VLR发送的 第二寻呼请求消息时, 通知所述 UE执行所述第二寻呼请求消息触发的 CS 回落流程, 所述第二寻呼请求消息用于指示所述 MME针对所述 UE的所述 下行 CS业务,所述第二寻呼请求消息包括所述 UE的国际移动用户标识 IMSI 和位置区标识 LAI;
或者
所述通知模块具体用于, 在所述 UE完成在所述 CS域的注册之后、 所 述第一定时器超时时, 通知所述 UE执行所述处理模块挂起的所述第一寻呼 请求消息触发的 CS回落流程。
14.根据权利要求 12所述的 MME,其特征在于,所述请求模块还用于, 在所述接收模块接收所述 UE发送的所述扩展业务请求消息之后, 向演进型 节点 B eNodeB发送初始上下文建立请求消息, 所述初始上下文建立请求消 息不包括电路交换回落 CSFB指示信息。
15. 根据权利要求 11所述的 MME, 其特征在于,
所述请求模块具体用于向所述 UE发送空口寻呼消息, 所述空口寻呼消 息包括的 CN域为分组交换 PS域,
所述接收模块还用于接收所述 UE根据所述空口寻呼消息发送的业务请 求消息。
16. 根据权利要求 14或 15所述的 MME, 其特征在于, 还包括: 第二定时模块, 用于在所述 UE完成在所述 CS域的注册之后, 启动第 二定时器,
其中, 所述通知模块具体用于, 在所述 UE完成在所述 CS域的注册之 后、 所述第二定时器超时之前, 所述接收模块接收到所述 MSC/VLR发送的 第二寻呼请求消息时, 通知所述 UE执行所述第二寻呼请求消息触发的 CS 回落流程, 其中所述第二寻呼请求消息用于指示所述 MME针对所述 UE的 所述下行 CS业务, 所述第二寻呼请求消息包括所述 UE的 IMSI和 LAI; 或者
所述通知模块具体用于, 在所述 UE完成在所述 CS域的注册之后、 所 述第二定时器超时时, 通知所述 UE执行所述处理模块挂起的所述第一寻呼 请求消息触发的 CS回落流程。
17. 根据权利要求 10至 16中任一项所述的 MME, 其特征在于, 所述 述请求模块具体用于, 向所述 UE发送分离请求消息, 所述分离请求消息用 于请求所述 UE发起所述联合位置更新流程, 所述分离请求消息中包括的分 离类型为 IMSI分离。
18. 根据权利要求 10至 17中任一项所述的 MME, 其特征在于, 所述 通知模块具体用于, 向所述 UE发送 CS业务通知消息, 以使所述 UE执行 所述下行 CS业务触发的 CS回落流程。
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