WO2017101117A1 - 一种重定向的方法及装置 - Google Patents

一种重定向的方法及装置 Download PDF

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Publication number
WO2017101117A1
WO2017101117A1 PCT/CN2015/097952 CN2015097952W WO2017101117A1 WO 2017101117 A1 WO2017101117 A1 WO 2017101117A1 CN 2015097952 W CN2015097952 W CN 2015097952W WO 2017101117 A1 WO2017101117 A1 WO 2017101117A1
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WO
WIPO (PCT)
Prior art keywords
bearer
voice service
base station
redirection
message
Prior art date
Application number
PCT/CN2015/097952
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English (en)
French (fr)
Inventor
刘菁
戴明增
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 KR1020187020731A priority Critical patent/KR102127723B1/ko
Priority to CN201580085343.5A priority patent/CN108370613A/zh
Priority to BR112018012269-6A priority patent/BR112018012269A2/zh
Priority to EP15910586.5A priority patent/EP3393201A4/en
Priority to PCT/CN2015/097952 priority patent/WO2017101117A1/zh
Publication of WO2017101117A1 publication Critical patent/WO2017101117A1/zh
Priority to US16/010,665 priority patent/US10455380B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H04W76/36—Selective release of ongoing connections for reassigning the resources associated with the released connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a method and an apparatus for redirecting.
  • LTE Long Term Evolution
  • UE user equipment
  • VoLTE Voice over LTE
  • the link quality between the UE and the base station is deteriorated.
  • the reason may trigger the base station to perform a redirection operation for the UE.
  • the UE voice service After the redirection operation, the UE voice service will drop.
  • the present invention provides a method and an apparatus for redirection, which is used to solve the problem that a voice service is dropped after a UE is redirected in the prior art.
  • a method of redirecting comprising:
  • the base network After the base station determines that the user equipment UE is to perform the redirection operation, the base network is notified to reserve the guaranteed bit rate GBR bearer or the voice service bearer corresponding to the UE;
  • the GBR bearer includes a voice service bearer.
  • the base station notifying the core network to reserve the GBR bearer or the voice service bearer corresponding to the UE includes:
  • the base station sends a UE context release request message to the mobility management network element, where the UE context release request message carries the first voice redirection reason indication information, where the first voice redirection reason indication information is used to indicate that the The GBR bearer or the voice service bearer corresponding to the UE.
  • the base station is instructing the UE to reserve a GBR bearer or a voice industry corresponding to the UE Hosting, including:
  • the base station sends a radio resource control RRC connection release message to the UE, where the RRC connection release message carries the second voice redirection reason indication information, where the second voice redirection reason indication information is used to indicate that the UE is reserved.
  • RRC connection release message carries the second voice redirection reason indication information, where the second voice redirection reason indication information is used to indicate that the UE is reserved.
  • the base station determines that the UE is to be redirected Operations, including:
  • the base station determines to perform a redirection operation on the UE.
  • a method for redirecting including:
  • the mobility management network element receives the notification message sent by the base station, where the notification message includes an indication of retaining the GBR bearer or the voice service bearer corresponding to the user equipment UE;
  • the mobility management network element retains a GBR bearer or a voice service bearer corresponding to the UE according to the notification message;
  • the gateway device is notified to reserve the GBR bearer or the voice service bearer corresponding to the UE.
  • the mobility management network element receives a notification message that is sent by the base station, where the notification message includes a GBR bearer or a voice service bearer corresponding to the user equipment UE.
  • the notification message includes a GBR bearer or a voice service bearer corresponding to the user equipment UE.
  • the mobility management network element receives a UE context release request message sent by the base station, where the UE context release request message carries voice redirection reason indication information, where the voice redirection reason indication information is used to indicate that the UE is reserved. GBR bearer or voice service bearer.
  • the mobility management network element notifies the gateway device to reserve the GBR bearer corresponding to the UE or Voice service bearer, including:
  • the mobility management network element sends a suspension bearer message to the gateway device, where the suspension bearer message is used to indicate that the gateway device reserves the GBR bearer or the voice service bearer corresponding to the UE.
  • the mobility management network element retains a GBR bearer or a voice service bearer corresponding to the UE, including:
  • the mobility management network element starts a timer, and reserves a GBR bearer or a voice service bearer corresponding to the UE before the timer expires.
  • a third possible implementation manner of the second aspect after the mobility management network element returns a response message of the notification message to the base station, also includes:
  • the mobility management network element feeding back an initial UE context setting response message to the other base station, and sending the suspension suspension bearer message corresponding to the suspension bearer message to the gateway device, where And the hanging bearer message is used to indicate that the gateway device restores the GBR bearer or the voice service bearer corresponding to the UE that is reserved, and the initial UE context setting response message includes the GBR bearer corresponding to the UE reserved by the mobility management network element.
  • the voice service bearer information where the other base station triggers the establishment of the GBR bearer or the voice service bearer corresponding to the UE.
  • a method for redirecting including:
  • the user equipment UE receives the redirection message sent by the first base station, where the redirection message carries the voice redirection reason indication information, where the voice redirection reason indication information is used to indicate that the GBR bearer or the voice service corresponding to the UE is reserved.
  • the UE reserves the GBR bearer or the voice service bearer corresponding to the UE.
  • the method further includes:
  • the UE accesses the second base station according to the carrier information included in the redirect message.
  • the method further includes:
  • the UE receives the configuration information that is sent by the second base station to establish a GBR bearer or a voice service bearer corresponding to the UE, and establishes the relationship with the second base station according to the configuration information.
  • the GBR bearer or the voice service bearer corresponding to the UE receives the configuration information that is sent by the second base station to establish a GBR bearer or a voice service bearer corresponding to the UE, and establishes the relationship with the second base station according to the configuration information.
  • the GBR bearer or the voice service bearer corresponding to the UE may be established.
  • a device for redirecting including:
  • a determining unit configured to determine that a user equipment UE is to be redirected
  • a notification unit configured to notify the core network to reserve a guaranteed bit rate GBR bearer or a voice service bearer corresponding to the UE after the determining unit determines that the user equipment UE is to perform a redirection operation;
  • an indication unit configured to: after the determining unit determines that the user equipment UE is to perform a redirection operation, instructing the UE to reserve a GBR bearer or a voice service bearer corresponding to the UE;
  • the GBR bearer includes a voice service bearer.
  • the notification unit is specifically configured to:
  • the UE context release request message carries the first voice redirection reason indication information, where the first voice redirection reason indication information is used to indicate that the UE is reserved.
  • GBR bearer or voice service bearer
  • the indication unit is specifically configured to:
  • Radio resource control RRC connection release message Sending a radio resource control RRC connection release message to the UE, where the RRC connection release message carries the second voice redirection reason indication information, where the second voice redirection reason indication information is used to indicate that the GBR corresponding to the UE is reserved. Bearer or voice service bearer.
  • the determining unit is specifically configured to:
  • the link quality with the UE cannot meet the current voice service quality requirement of the UE, it is determined that the UE is to perform a redirection operation.
  • a device for redirecting including:
  • a receiving unit configured to receive a notification message sent by the base station, where the notification message includes an indication of retaining a GBR bearer or a voice service bearer corresponding to the user equipment UE;
  • a retaining unit configured to reserve a GBR bearer or a voice service bearer corresponding to the UE according to the notification message received by the receiving unit;
  • the notification unit is configured to notify the gateway device to reserve the GBR bearer or the voice service bearer corresponding to the UE.
  • the receiving unit is specifically configured to:
  • the base station Receiving a UE context release request message sent by the base station, where the UE context release request message carries the voice redirection reason indication information, where the voice redirection reason indication information is used to indicate that the GBR bearer or the voice service bearer corresponding to the UE is reserved.
  • the notification unit is specifically configured to:
  • the retaining unit is specifically configured to:
  • the timer is started, and the GBR bearer or the voice service bearer corresponding to the UE is reserved before the timer expires.
  • the receiving unit is further configured to:
  • the notifying unit is further configured to: after the receiving unit receives the request message of the UE initial information sent by another base station, feed back an initial UE context setting response message to the other base station according to the request message, and Sending, to the gateway device, the hang-up bearer message corresponding to the hang-up bearer message, where the hang-up bearer message is used to indicate that the gateway device restores the reserved GBR bearer or voice service bearer corresponding to the UE;
  • the initial UE context setting response message includes the GBR bearer or the voice service bearer information corresponding to the UE reserved by the mobility management network element, and is used by the other base station to trigger the establishment of the GBR bearer or the voice service bearer corresponding to the UE.
  • a device for redirecting including:
  • a receiving unit configured to receive a redirection message sent by the first base station, where the redirection message carries a voice redirection reason indication information, where the voice redirection reason indication information is used to indicate that the GBR bearer corresponding to the device is reserved or Voice service bearer;
  • a reservation unit is configured to reserve a GBR bearer or a voice service bearer corresponding to the device.
  • the method further includes:
  • An access unit configured to access the second base station according to the carrier information included in the redirect message.
  • the method further includes:
  • Establishing a bearer unit configured to receive, by the receiving unit, configuration information that is sent by the second base station to establish a GBR bearer or a voice service bearer corresponding to the device, and establish a relationship with the second base station according to the configuration information.
  • the GBR bearer or the voice service bearer corresponding to the device is a bearer unit, configured to receive, by the receiving unit, configuration information that is sent by the second base station to establish a GBR bearer or a voice service bearer corresponding to the device, and establish a relationship with the second base station according to the configuration information.
  • a seventh aspect provides a redirection device, including a transceiver, a processor, a memory, and a bus, wherein the transceiver, the processor, and the memory are all connected to a bus, wherein the memory stores a set of programs, and the processor uses The program stored in the memory is invoked such that the apparatus performs the method of any of the first to third possible implementations of the first aspect and the first aspect.
  • a mobility management network element including a transceiver, a processor, a memory, and a bus, wherein the transceiver, the processor, and the memory are all connected to a bus, wherein the memory stores a set of programs, and the processing The program is configured to invoke a program stored in the memory, such that the mobility management network element performs the method of any one of the first to fourth possible implementations of the second aspect and the second aspect.
  • a ninth aspect provides a user equipment, including a transceiver, a processor, a memory, and a bus, wherein the transceiver, the processor, and the memory are all connected to a bus, wherein the memory stores a set of programs, and the processor is used to call
  • the program stored in the memory causes the user equipment to perform the method of any one of the first to second possible implementations of the third aspect and the third aspect.
  • the base station after determining that the redirection operation of the UE is triggered, the base station notifies the core network to reserve the UE pair.
  • the GBR bearer or the voice service bearer is instructed, and the UE is instructed to retain its corresponding GBR bearer or voice service bearer.
  • the GBR bearer includes a voice service bearer. This ensures that after the UE is redirected to the new base station, the UE side can ensure that its voice service bearer is reserved, and the core network can trigger the new base station after receiving the request message of the new base station because it retains the voice service bearer of the UE.
  • the voice service bearer is set up between the UE and the UE. After the voice service bearer is established, the UE can perform the voice service on the voice service bearer to ensure the smooth progress of the voice service and avoid the problem of the UE dropping the call after the redirect. .
  • FIG. 1 is a schematic flowchart of a redirection method in the prior art
  • FIG. 2 is a schematic diagram of a network architecture applied to the present application
  • FIG. 3 is a schematic flowchart of a redirection method in the present application.
  • FIG. 4 is a flowchart of an example of a redirection process in an application scenario according to the present application.
  • FIG. 5 is a schematic structural diagram of a first redirection device in the present application.
  • FIG. 6 is a schematic structural diagram of a second redirection device in the present application.
  • FIG. 7 is a schematic structural diagram of a third redirection device in the present application.
  • Figure 8 is a schematic structural view of a fourth redirection device in the present application.
  • FIG. 9 is a schematic structural diagram of a mobility management network element provided by the present application.
  • FIG. 10 is a schematic structural diagram of a user equipment provided by the present application.
  • the base station determines to perform a redirection operation on the UE
  • the base The station sends a UE Context Release Request message to the Mobility Management Entity (MME).
  • MME Mobility Management Entity
  • the MME releases the minimum guaranteed bit rate of the UE (Guaranteed Bit Rate, GRB) bearer
  • the MME sends a Release Access Bearers Request message to the gateway device to notify the gateway device to release the GRB bearer of the UE, which also means releasing the voice service bearer of the UE, where the gateway device includes the serving gateway.
  • the gateway device returns a Release Access Bearers Response message to the MME, and triggers a Session Initiation Protocol (SIP) through a Proxy-Call Session Control Function (P-CSCF).
  • SIP Session Initiation Protocol
  • P-CSCF Proxy-Call Session Control Function
  • the MME After receiving the Release Access Bearers Response message returned by the SGW/PGW, the MME returns a UE Context Release Command (UE Context Release Command) message to the base station, and the base station sends a Radio Resource Control (RRC) connection release to the UE.
  • UE Context Release Command UE Context Release Command
  • RRC Radio Resource Control
  • the UE After receiving the RRC Connect Release message, the UE does not release the voice service bearer. Therefore, after the UE accesses the new base station according to the redirected carrier information indicated by the base station, the UE does not trigger the establishment of the voice service bearer; The MME and the gateway device have released the voice service bearer of the UE, so that the voice service of the UE is dropped after the redirect.
  • the base station informs the core network to reserve the GBR bearer or the voice service bearer corresponding to the UE, and instructs the UE to retain the corresponding The GBR bearer or the voice service bearer, wherein the GBR bearer includes a voice service bearer.
  • the core network side retains the GBR bearer or the voice service bearer corresponding to the UE, so the base station is triggered to establish a GBR bearer or a voice service bearer between the base station and the UE, and the GBR bearer or the voice service bearer is established.
  • the UE can perform voice service transmission on the established voice service bearer to ensure that the UE does not drop the call after the redirect.
  • the present application is applied to an LTE network, and particularly relates to a voice service in an LTE network.
  • the network architecture applied in this application is shown in FIG. 2.
  • the LTE system 20 includes a UE 21, a base station 22, an MME 23, and a gateway device 24.
  • the UE 21 may be a calling UE that performs voice service, or may be a called UE that performs voice service.
  • the base station 22 is an evolved NodeB (eNB). In the description of the following embodiments, the eNB is conceptually equivalent to the base station. .
  • the MME 23 is a mobility management network element, and the mobility management network element may also be a Serving GPRS Support Node (SGSN).
  • SGSN Serving GPRS Support Node
  • the mobility management network element takes the MME as an example, and the description of the following embodiments
  • the medium MME is conceptually equivalent to the mobility management network element.
  • the gateway device 24 includes an SGW and a PGW.
  • the MME 23 and the gateway device 24 may serve one or more eNBs. After the UE 21 is redirected to the new eNB, the original MME and the gateway device may be replaced by a new MME and a gateway. Under the device.
  • the flowchart of the method for redirecting provided by the present application is as follows.
  • the base station that is accessed before the UE redirection is referred to as the first base station
  • the base station that is accessed after the redirection is referred to as the second base station.
  • Step 300 After the first base station determines that the UE is to perform the redirection operation, the first base station notifies the core network to reserve the GBR bearer or the voice service bearer corresponding to the UE.
  • the first base station determines that the redirection operation is to be performed on the UE. For example, the first base station, according to the measurement report of the UE, finds that the link quality between the first base station and the UE cannot meet the current voice service quality requirement of the UE. Then, it is determined that the UE is to be redirected.
  • the first base station After the first base station determines to trigger the UE to perform the redirection operation, the first base station sends a UE context release request message to the core network, where the UE context release request message carries the first voice redirection reason indication information, which is used to indicate that the UE is reserved. GBR bearer or voice service bearer.
  • the first base station sends a UE context release request message, that is, a UE Context Release Request message, to the MME in the core network, in the UE Context Release Request message.
  • the reason for the release reason field is included in the present disclosure.
  • a voice redirection reason indication information that is, the first voice redirection reason indication information, is newly added in the release reason field.
  • the first voice redirection indication information is used to indicate that the MME in the core network reserves the GBR bearer or the voice service bearer corresponding to the UE.
  • Step 310 The MME receives the notification message sent by the first base station, where the notification message includes an indication of the GBR bearer or the voice service bearer corresponding to the user equipment UE.
  • the MME retains the GBR bearer or the voice service bearer corresponding to the UE according to the notification message. .
  • the MME receives the UE context release request message sent by the first base station, that is, the UE Context Release Request message, where the UE Context Release Request message carries the first voice redirection reason indication information. After the MME analyzes the message, it is determined that the first voice redirection reason indication information is carried in the message, and the GBR bearer or the voice service bearer corresponding to the UE is reserved locally according to the message.
  • the MME starts a timer to reserve the GBR bearer or the voice service bearer corresponding to the UE locally before the timer expires.
  • Step 320 The MME notifies the gateway device to reserve the GBR bearer or the voice service bearer corresponding to the UE.
  • the MME not only keeps the GBR bearer or the voice service bearer corresponding to the UE locally, but also needs to notify the gateway device to reserve the GBR bearer or the voice service bearer corresponding to the UE.
  • the MME sends a suspension bearer message to the gateway device, and receives a response message for the suspension bearer message fed back by the gateway device.
  • the Suspend Notification message is used to indicate that the gateway device reserves the GBR bearer or the voice service bearer corresponding to the UE.
  • the MME sends a Suspend Notification to the SGW and the PGW, and notifies the SGW and the PGW to suspend the GBR bearer or the voice service bearer corresponding to the UE.
  • the MME can determine that the SGW and the PGW have already UEs. The corresponding GBR bearer or voice service bearer is suspended.
  • the GPON bearer or the voice service bearer corresponding to the UE is suspended by the gateway device, and the process of releasing the voice session by the peer UE that does not trigger the UE communication is not triggered.
  • Step 330 The MME returns a response message of the notification message to the first base station.
  • the MME returns a UE context release command, that is, a UE Context Release Command, to the first base station for the UE context release request message sent by the first base station, that is, the UE Context Release Request message.
  • Step 340 The first base station instructs the UE to reserve the GBR bearer or the voice service bearer corresponding to the UE.
  • the first base station sends a redirection message to the UE, where the redirection message carries indication information indicating that the UE retains the GBR bearer or the voice service bearer corresponding to the UE.
  • the first base station after receiving the UE context release command returned by the MME in the core network, the first base station sends an RRC connection release message, that is, an RRC Connection Release message, the RRC Connection Release message carries the second voice redirection reason.
  • the indication information is used to indicate that the UE reserves the GBR bearer or the voice service bearer corresponding to the UE.
  • the RRC Connection Release message also carries the UE redirection carrier information, which is used to indicate the location of the new base station redirected by the UE.
  • the first base station learns that other base stations in the surrounding area are more suitable for accessing the UE, so that the voice service quality of the UE is satisfied. Then, the RRC Connection Release message carries the carrier information of the other base station that is more suitable for accessing the UE.
  • the RRC Connection Release message sent by the first base station to the UE carries a release reason field.
  • a voice redirection reason indication information that is, a second voice redirection indication information
  • the second voice redirection indication information is used to indicate that the GBR bearer or the voice service bearer corresponding to the UE is reserved.
  • Step 350 The UE receives the redirect message sent by the first base station, where the redirect message carries the second voice redirection reason indication information, and the UE retains the GBR bearer or the voice service bearer corresponding to the UE.
  • the UE receives the RRC Connection Release message sent by the first base station, parses the release reason field in the RRC Connection Release message, and determines that the second voice redirection reason indication information exists, and the UE retains the GBR bearer or the voice service bearer corresponding to the UE. .
  • the UE may also learn the redirected carrier information according to the RRC Connection Release message.
  • Step 360 The UE accesses the second base station according to the carrier information included in the redirect message.
  • the UE is redirected to the second base station according to the carrier information included in the RRC Connection Release message sent by the first base station. That is, an RRC connection is established between the UE and the second base station.
  • the second base station may be connected to the same MME on the same eNB, or the second base station may be connected to the first eNB on different MMEs. It is assumed below that the second base station is connected to the first base station on the same MME.
  • Step 370 The MME receives the request message of the initial information of the UE sent by the other base station, that is, the request message of the UE Initial Message.
  • the other base station is also the second base station, that is, the base station that is accessed after the UE is redirected.
  • Step 380 The MME feeds back an initial UE context setting response message to the other base station according to the request message, and sends a release suspension bearer message corresponding to the suspension bearer message to the gateway device.
  • the un-suspended bearer message is used to indicate that the gateway device restores the reserved GBR bearer or the voice service bearer corresponding to the UE, and the initial UE context setup response message includes the GBR bearer corresponding to the UE reserved by the MME. Or the voice service bearer information, where the second base station triggers the establishment of the GBR bearer or the voice service bearer corresponding to the UE.
  • the MME after receiving the request message of the UE Initial Message sent by the second base station, the MME feeds back the Initial UE Context Setup Request message to the second base station. Because the MME previously retains the GBR bearer or the voice service bearer corresponding to the UE, the MME is The initial UE Context Setup Request message fed back to the second base station carries the GBR bearer or voice service bearer information corresponding to the previously reserved UE.
  • the MME also sends a Resume Notification message to the SGW and the PGW, instructing the SGW and the PGW to resume the suspension of the GBR bearer or the voice service bearer corresponding to the previously suspended UE.
  • the second base station After receiving the Initial UE Context Setup Request message sent by the MME, the second base station triggers establishment of a voice service bearer with the UE.
  • the configuration information of the voice service bearer corresponding to the UE is sent to the UE.
  • the tracking area update (TAU) process is triggered after the UE accesses the second base station, and the process is performed.
  • the new MME may acquire the UE context from the original MME to which the first base station is connected. Therefore, the above steps 370 to 380 are also applicable to the case where the second base station is connected to the first base station in a different MME.
  • Step 390 The UE receives the configuration information of the voice service bearer corresponding to the UE that is sent by the second base station, and establishes a voice service bearer corresponding to the UE with the second base station according to the configuration information.
  • the new base station can be triggered to establish a voice service bearer between the UE and the UE.
  • the UE can perform voice service on the voice service bearer to ensure smooth voice service and avoid the voice service. The problem that the UE dropped the call after the redirect.
  • FIG. 4 it is a specific flowchart in the redirection process in this embodiment, where the SGW/PGW represents a gateway device, and the SGW and the PGW are located in the same entity, and can be logically separated.
  • the base station before the UE redirection is eNB1, and the base station after redirection is eNB2.
  • eNB1 and eNB2 are connected to the same MME.
  • Step 400 eNB1 triggers a redirection operation on the UE.
  • Step 401 eNB1 sends a UE Context Release Request message to the MME.
  • the message carries an indication information, which is used to indicate that the GBR bearer or the voice service bearer of the UE is reserved.
  • the UE Context Release Request message carries a release reason field.
  • a voice redirection reason indication is added to the release reason field, indicating that the reason for the UE context release request message sent this time includes that the UE needs to be redirected to other base stations.
  • Step 402 The MME reserves the GBR bearer or the voice service bearer corresponding to the UE.
  • Step 403 The MME sends a Suspend Notification message to the SGW/PGW, and notifies the SGW/PGW to hang the GBR bearer or the voice service bearer corresponding to the UE.
  • Step 404 The SGW/PGW feeds back the Suspend Acknowledge message to the MME.
  • this process does not trigger the release of the voice session of the peer UE.
  • Step 405 The MME returns a UE Context Release Command to the eNB1.
  • Step 406 The eNB1 sends an RRC Connection Release message to the UE, and carries the voice redirection reason indication information in the message.
  • the voice redirection reason indication information is used to notify the UE to retain its corresponding GBR bearer or voice service bearer.
  • the RRC Connection Release message also carries the carrier information of the UE redirection.
  • Step 407 After receiving the RRC Connection Release message, the UE retains its corresponding voice service bearer.
  • Step 408 The UE redirects to the eNB2 according to the UE redirection carrier information carried in the RRC Connection Release message, that is, establishes a connection with the eNB2.
  • Step 409 The eNB2 sends a request message of the UE Initial Message to the MME.
  • Step 410 The MME returns an Initial UE Context Setup Request message to the eNB2.
  • Step 411 The MME sends a Resume Notification message to the SGW/PGW, and notifies the SGW/PGW to unhook the GBR bearer or the voice service bearer corresponding to the previously reserved UE.
  • Steps 410 and 411 are interchangeable in timing.
  • Step 412 Perform RRC connection reconfiguration between the eNB2 and the UE to recover the voice service bearer between the eNB2 and the UE.
  • the first redirection device 50 provided by the present application is used to execute the method shown in FIG. 3.
  • the device 50 includes: a determining unit 51, a notification unit 52, and an indicating unit 53, among them:
  • a determining unit 51 configured to determine that a user equipment UE is to perform a redirection operation
  • the notification unit 52 is configured to notify the core network to reserve the guaranteed bit rate GBR bearer or the voice service bearer corresponding to the UE after the determining unit 51 determines that the user equipment UE is to perform the redirection operation;
  • the indicating unit 53 is configured to: after the determining unit 51 determines that the user equipment UE is to perform a redirection operation, instructing the UE to reserve a GBR bearer or a voice service bearer corresponding to the UE;
  • the GBR bearer includes a voice service bearer.
  • the notification unit 52 is specifically configured to:
  • the UE context release request message carries the first voice redirection reason indication information, which is used to indicate that the GBR bearer or the voice service bearer corresponding to the UE is reserved.
  • the indicating unit 53 is specifically configured to:
  • the RRC connection release message carries the second voice redirection reason indication information, which is used to indicate that the GBR bearer or the voice service bearer corresponding to the UE is reserved.
  • the determining unit 51 is specifically configured to:
  • the link quality with the UE cannot meet the current voice service quality requirement of the UE, it is determined that the UE is to perform a redirection operation.
  • the second redirection device 60 provided by the present application is used to execute the method shown in FIG. 3.
  • the device 60 includes: a receiving unit 61, a retaining unit 62, and a notification unit 63. among them,
  • the receiving unit 61 is configured to receive a notification message sent by the base station, where the notification message includes an indication of retaining a GBR bearer or a voice service bearer corresponding to the user equipment UE;
  • the retaining unit 62 is configured to reserve a GBR bearer or a voice service bearer corresponding to the UE according to the notification message received by the receiving unit 61.
  • the notification unit 63 is configured to notify the gateway device to reserve the GBR bearer or the voice service bearer corresponding to the UE.
  • the receiving unit 61 is specifically configured to:
  • the base station Receiving a UE context release request message sent by the base station, where the UE context release request message carries the voice redirection reason indication information, and is used to indicate that the GBR bearer or the voice service bearer corresponding to the UE is reserved.
  • the notification unit 63 is specifically configured to:
  • the reservation unit 62 is specifically configured to:
  • the timer is started, and the GBR bearer or the voice service bearer corresponding to the UE is reserved before the timer expires.
  • the receiving unit 61 is further configured to:
  • the notification unit 63 is further configured to: after the receiving unit 61 receives the request message of the UE initial information sent by another base station, feed back an initial UE context setting response message to the other base station according to the request message, And sending, to the gateway device, the release suspension bearer message corresponding to the suspension bearer message, where the release suspension bearer message is used to indicate that the gateway device restores the reserved GBR bearer or the voice service bearer corresponding to the UE;
  • the initial UE context setting response message includes the GBR bearer or the voice service bearer information corresponding to the UE reserved by the mobility management network element, and is used by the other base station to trigger the establishment of the GBR bearer or the voice service bearer corresponding to the UE. .
  • the present application provides a third redirection device 70 for performing the method shown in FIG. 3.
  • the device 70 includes a receiving unit 71 and a reservation unit 72.
  • the receiving unit 71 is configured to receive the redirection message sent by the first base station, where the redirection message carries the voice redirection reason indication information, where the voice redirection reason indication information is used to indicate that the GBR bearer corresponding to the device is reserved. Or voice service bearer;
  • the retaining unit 72 is configured to reserve a GBR bearer or a voice service bearer corresponding to the device.
  • the device 70 further includes: an access unit 73.
  • the access unit 73 is configured to access the second base station according to the carrier information included in the redirect message.
  • the device 70 further includes: establishing a load bearing unit 74.
  • the bearer unit 74 is configured to receive, by the receiving unit 71, configuration information that is sent by the second base station to establish a GBR bearer or a voice service bearer corresponding to the device, and according to the configuration information, Establish a GBR bearer or a voice service bearer corresponding to the device.
  • the fourth redirection device 80 includes a transceiver 81, a processor 82, a memory 83, and a bus 84.
  • the transceiver 81, the processor 82, and the memory 83 are all provided.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 82 and various circuits of memory represented by memory 83.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus provides an interface.
  • Transceiver 81 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 82 is responsible for managing the bus architecture and general processing, and the memory 83 can store data used by the processor 82 in performing the operations.
  • the present application provides a mobility management network element 90 including a transceiver 91, a processor 92, a memory 93, and a bus 94.
  • the transceiver 91, the processor 92, and the memory 93 are all provided.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 92 and various circuits of memory represented by memory 93.
  • the bus architecture can also be used such as peripherals, voltage regulators, and power management circuits.
  • Various other circuits of the class are linked together, which are well known in the art and, therefore, will not be further described herein.
  • the bus provides an interface.
  • Transceiver 91 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 92 is responsible for managing the bus architecture and general processing, and the memory 93 can store data used by the processor 92 when performing operations.
  • the present application provides a user equipment 100 including a transceiver 101, a processor 102, a memory 103, and a bus 104.
  • the transceiver 101, the processor 102, and the memory 103 are all connected to the bus 104.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 102 and various circuits of memory represented by memory 103.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus provides an interface.
  • the transceiver 101 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 102 is responsible for managing the bus architecture and general processing, and the memory 103 can store data used by the processor 102 in performing operations.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本申请涉及通信技术领域，公开了一种重定向的方法及装置，用以保证UE重定向后不掉话。该方法为：基站确定要对用户设备UE进行重定向操作后，通知核心网保留所述UE对应的GBR承载或语音业务承载；并指示所述UE保留所述UE对应的GBR承载或语音业务承载。这样，保证UE在重定向到新的基站后，UE侧可以确保保留其语音业务承载，并且核心网由于保留了UE的语音业务承载，在收到新的基站的请求消息后，可以触发新的基站在其与UE之间建立语音业务承载，一旦该语音业务承载建立好，UE就可以在该语音业务承载上进行语音业务，保证语音业务的顺利进行，避免了UE在重定向后掉话的问题。

Description

一种重定向的方法及装置 技术领域
本申请涉及通信技术领域，特别涉及一种重定向的方法及装置。
背景技术
在长期演进(Long Term Evolution，LTE)网络中，用户设备(User Equipment，UE)在进行语音业务(例如：Voice over LTE，简称：VoLTE)时，由于UE与基站之间链路质量变差等原因，可能会触发基站针对UE进行重定向操作。
重定向操作后，UE语音业务会发生掉话。
发明内容
本申请提供一种重定向的方法及装置，用以解决现有技术中存在的UE重定向后，语音业务发生掉话的问题。
第一方面，提供一种重定向的方法，该方法包括：
基站确定要对用户设备UE进行重定向操作后，通知核心网保留所述UE对应的保证比特率GBR承载或者语音业务承载；并
指示所述UE保留所述UE对应的GBR承载或者语音业务承载；
其中，所述GBR承载包括语音业务承载。
结合第一方面，在第一方面的第一种可能的实现方式中，所述基站通知核心网保留所述UE对应的GBR承载或者语音业务承载，包括：
所述基站向移动性管理网元发送UE上下文释放请求消息，所述UE上下文释放请求消息中携带第一语音重定向原因指示信息，所述第一语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
结合第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述基站指示所述UE保留所述UE对应的GBR承载或者语音业 务承载，包括：
所述基站向所述UE发送无线资源控制RRC连接释放消息，所述RRC连接释放消息中携带第二语音重定向原因指示信息，所述第二语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
结合第一方面和第一方面的第一种及第二种可能的实现方式中的任意一种，在第一方面的第三种可能的实现方式中，所述基站确定要对UE进行重定向操作，包括：
所述基站在与所述UE之间的链路质量无法满足所述UE当前语音业务质量需求时，确定要对所述UE进行重定向操作。
第二方面，提供一种重定向的方法，包括：
移动性管理网元接收基站发送的通知消息，所述通知消息包含保留用户设备UE对应的GBR承载或者语音业务承载的指示；
所述移动性管理网元按照所述通知消息，保留所述UE对应的GBR承载或者语音业务承载；并
通知网关设备保留所述UE对应的GBR承载或者语音业务承载。
结合第二方面，在第二方面的第一种可能的实现方式中，所述移动性管理网元接收基站发送的通知消息，所述通知消息包含保留用户设备UE对应的GBR承载或者语音业务承载的指示，包括：
所述移动性管理网元接收基站发送的UE上下文释放请求消息，所述UE上下文释放请求消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
结合第二方面或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，所述移动性管理网元通知网关设备保留所述UE对应的GBR承载或者语音业务承载，包括：
所述移动性管理网元向网关设备发送悬挂承载消息，所述悬挂承载消息用于指示网关设备保留所述UE对应的GBR承载或者语音业务承载。
结合第二方面和第二方面的第一种至第二种可能的实现方式中的任一 种，在第二方面的第三种可能的实现方式中，所述移动性管理网元按照所述通知消息，保留所述UE对应的GBR承载或者语音业务承载，包括：
所述移动性管理网元启动定时器，在所述定时器超时之前，保留所述UE对应的GBR承载或者语音业务承载。
结合第二方面的第一种或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，所述移动性管理网元向基站返回所述通知消息的响应消息之后，还包括：
所述移动性管理网元接收到其他基站发送的所述UE初始信息的请求消息；
所述移动性管理网元基于所述请求消息，向所述其他基站反馈初始UE上下文设置应答消息，以及，向所述网关设备发送所述悬挂承载消息对应的解除悬挂承载消息；其中，所述解除悬挂承载消息用于指示网关设备将保留的所述UE对应的GBR承载或者语音业务承载恢复使用；所述初始UE上下文设置应答消息中包含移动性管理网元保留的所述UE对应的GBR承载或者语音业务承载信息，用于所述其他基站触发所述UE对应的GBR承载或者语音业务承载的建立。
第三方面，提供一种重定向的方法，包括：
用户设备UE接收到第一基站发送的重定向消息，所述重定向消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载；
所述UE保留所述UE对应的GBR承载或者语音业务承载。
结合第三方面，在第三方面的第一种可能的实现方式中，还包括：
所述UE根据所述重定向消息中包含的载波信息，接入第二基站。
结合第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，所述方法还包括：
所述UE接收所述第二基站发送的建立所述UE对应的GBR承载或者语音业务承载的配置信息，根据所述配置信息，与所述第二基站之间建立所述 UE对应的GBR承载或者语音业务承载。
第四方面，提供一种重定向的装置，包括：
确定单元，用于确定要对用户设备UE进行重定向操作；
通知单元，用于在所述确定单元确定要对用户设备UE进行重定向操作后，通知核心网保留所述UE对应的保证比特率GBR承载或者语音业务承载；
指示单元，用于在所述确定单元确定要对用户设备UE进行重定向操作后，指示所述UE保留所述UE对应的GBR承载或者语音业务承载；
其中，所述GBR承载包括语音业务承载。
结合第四方面，在第四方面的第一种可能的实现方式中，所述通知单元具体用于：
向移动性管理网元发送UE上下文释放请求消息，所述UE上下文释放请求消息中携带第一语音重定向原因指示信息，所述第一语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
结合第四方面的第一种可能的实现方式，在第四方面的第二种可能的实现方式中，所述指示单元具体用于：
向所述UE发送无线资源控制RRC连接释放消息，所述RRC连接释放消息中携带第二语音重定向原因指示信息，所述第二语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
结合第四方面和第四方面的第一种至第二种可能的实现方式，在第四方面的第三种可能的实现方式中，所述确定单元具体用于：
在与所述UE之间的链路质量无法满足所述UE当前语音业务质量需求时，确定要对所述UE进行重定向操作。
第五方面，提供一种重定向的装置，包括：
接收单元，用于接收基站发送的通知消息，所述通知消息包含保留用户设备UE对应的GBR承载或者语音业务承载的指示；
保留单元，用于按照所述接收单元接收到的通知消息，保留所述UE对应的GBR承载或者语音业务承载；
通知单元，用于通知网关设备保留所述UE对应的GBR承载或者语音业务承载。
结合第五方面，在第五方面的第一种可能的实现方式中，所述接收单元具体用于：
接收基站发送的UE上下文释放请求消息，所述UE上下文释放请求消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
结合第五方面或第五方面的第一种可能的实现方式，在第五方面的第二种可能的实现方式中，所述通知单元具体用于：
向网关设备发送悬挂承载消息，所述悬挂承载消息用于指示网关设备保留所述UE对应的GBR承载或者语音业务承载。
结合第五方面和第五方面的第一种至第二种可能的实现方式中的任一种，在第五方面的第三种可能的实现方式中，所述保留单元具体用于：
启动定时器，在所述定时器超时之前，保留所述UE对应的GBR承载或者语音业务承载。
结合第五方面的第二种或第三种可能的实现方式，在第五方面的第四种可能的实现方式中，所述接收单元还用于：
接收到其他基站发送的所述UE初始信息的请求消息；
所述通知单元还用于，在所述接收单元接收到其他基站发送的所述UE初始信息的请求消息后，基于所述请求消息，向所述其他基站反馈初始UE上下文设置应答消息，以及，向所述网关设备发送所述悬挂承载消息对应的解除悬挂承载消息；其中，所述解除悬挂承载消息用于指示网关设备将保留的所述UE对应的GBR承载或者语音业务承载恢复使用；所述初始UE上下文设置应答消息中包含移动性管理网元保留的所述UE对应的GBR承载或者语音业务承载信息，用于所述其他基站触发所述UE对应的GBR承载或者语音业务承载的建立。
第六方面，提供一种重定向的装置，包括：
接收单元，用于接收到第一基站发送的重定向消息，所述重定向消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述装置对应的GBR承载或者语音业务承载；
保留单元，用于保留所述装置对应的GBR承载或者语音业务承载。
结合第六方面，在第六方面的第一种可能的实现方式中，还包括：
接入单元，用于根据所述重定向消息中包含的载波信息，接入第二基站。
结合第六方面的第一种可能的实现方式，在第六方面的第二种可能的实现方式中，还包括：
建立承载单元，用于在所述接收单元接收所述第二基站发送的建立所述装置对应的GBR承载或者语音业务承载的配置信息，根据所述配置信息，与所述第二基站之间建立所述装置对应的GBR承载或者语音业务承载。
第七方面，提供一种重定向的装置，包括收发器、处理器、存储器和总线，收发器、处理器、存储器均与总线连接，其中，所述存储器中存储一组程序，所述处理器用于调用所述存储器中存储的程序，使得所述装置执行如第一方面和第一方面的第一种至第三种可能的实现方式中的任一项所述的方法。
第八方面，提供一种移动性管理网元，包括收发器、处理器、存储器和总线，收发器、处理器、存储器均与总线连接，其中，所述存储器中存储一组程序，所述处理器用于调用所述存储器中存储的程序，使得所述移动性管理网元执行如第二方面和第二方面的第一种至四种可能的实现方式中的任一种所述的方法。
第九方面，提供一种用户设备，包括收发器、处理器、存储器和总线，收发器、处理器、存储器均与总线连接，其中，所述存储器中存储一组程序，所述处理器用于调用所述存储器中存储的程序，使得所述用户设备执行如第三方面和第三方面的第一种至第二种可能的实现方式中的任一项所述的方法。
本申请中，基站在决定触发UE的重定向操作后，通知核心网保留UE对 应的GBR承载或者语音业务承载，并指示UE保留其对应的GBR承载或者语音业务承载，其中，GBR承载中包括语音业务承载。这保证UE在重定向到新的基站后，UE侧可以确保保留其语音业务承载，并且核心网由于保留了UE的语音业务承载，在收到新的基站的请求消息后，可以触发新的基站在其与UE之间建立语音业务承载，一旦该语音业务承载建立好，UE就可以在该语音业务承载上进行语音业务，保证语音业务的顺利进行，避免了UE在重定向后掉话的问题。
附图说明
图1为现有技术中重定向方法流程示意图；
图2为本申请应用的网络架构示意图；
图3为本申请中重定向方法流程示意图；
图4为本申请一种应用场景下重定向过程示例的流程图；
图5为本申请中第一种重定向装置的结构示意图；
图6为本申请中第二种重定向装置的结构示意图；
图7为本申请中第三种重定向装置的结构示意图；
图8为本申请中第四种重定向装置的结构示意图；
图9为本申请提供的移动性管理网元的结构示意图；
图10为本申请提供的用户设备的结构示意图；
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
参阅图1所示，LTE网络中，基站决定针对UE进行重定向操作后，该基 站向移动管理实体(Mobility Management Entity，MME)发送UE上下文释放请求(UE Context Release Request)消息，MME收到基站发送的UE Context Release Request消息后，MME将释放该UE的最小保证比特率(Guaranteed Bit Rate，GRB)承载，GRB承载中包括QCI＝1的语音业务承载，这就意味着MME将释放该UE的语音业务承载。
进一步地，MME通过向网关设备发送释放接入承载请求(Release Access Bearers Request)消息，通知网关设备释放该UE的GRB承载，同样意味着释放该UE的语音业务承载，其中，网关设备包括服务网关(Serving GateWay，SGW)、PDN网关(PDN GateWay，PGW)。接着，网关设备向MME返回释放接入承载响应(Release Access Bearers Response)消息，并通过代理呼叫会话控制功能(Proxy-Call Session Control Function，P-CSCF)触发会话初始协议(Session Initiation Protocol，SIP)信令的释放流程，使该UE的对端UE释放本次语音会话。
再进一步地，MME收到SGW/PGW返回的Release Access Bearers Response消息后，向基站返回UE上下文释放命令(UE Context Release Command)消息，基站向UE发送无线资源控制(Radio Resource Control，RRC)连接释放消息，即RRC Connect Release消息，该消息中携带了重定向的载波信息。
UE收到该RRC Connect Release消息后，并不会释放语音业务承载，这样，UE在根据基站指示的重定向的载波信息接入到新的基站之后，就不会触发语音业务承载的建立；另外，由于MME和网关设备已经释放了该UE的语音业务承载，从而导致UE在重定向后语音业务发生掉话。
鉴于UE在重定向后，语音业务发生掉话的问题，本申请中，基站在决定对UE进行重定向操作后，通知核心网保留UE对应的GBR承载或者语音业务承载，并指示UE保留其对应的GBR承载或者语音业务承载，其中，GBR承载中包括语音业务承载。这样，UE在重定向后，由于核心网侧保留了UE对应的GBR承载或者语音业务承载，因此会触发基站在基站与UE之间建立GBR承载或者语音业务承载，在GBR承载或者语音业务承载建立好以后， UE就可以在建立好的语音业务承载上进行语音业务的传输，保证UE在重定向后不掉话。
本申请应用于LTE网络，尤其涉及LTE网络中的语音业务。本申请应用的网络架构如图2所示，LTE系统20包括UE21、基站22、MME23、网关设备24。其中，UE21可以为进行语音业务的主叫UE，也可以为进行语音业务的被叫UE；基站22为演进型基站(evolved NodeB，eNB)，以下实施例的描述中eNB在概念上与基站等同。MME23为移动性管理网元，其中，移动性管理网元也可以为服务GPRS支持节点(Serving GPRS Support Node，SGSN)，本申请中，移动性管理网元以MME为例，以下实施例的描述中MME在概念上与移动性管理网元等同。网关设备24包括SGW、PGW，MME23与网关设备24可能为一个或多个eNB服务，UE21重定向到新的eNB后，可能在原来的MME与网关设备下，也可能更换到新的MME与网关设备下。
以下将结合具体实施例对本申请提供的重定向的方法及装置进行详细说明。
参阅图3所示，本申请提供的重定向的方法流程图如下所述。以下，为方便说明，UE重定向之前接入的基站称为第一基站，重定向之后接入的基站称为第二基站。
步骤300：第一基站确定要对UE进行重定向操作后，通知核心网保留所述UE对应的GBR承载或者语音业务承载。
其中，第一基站确定要对UE进行重定向操作的原因有多种，例如，第一基站根据UE的测量上报，发现第一基站与UE之间的链路质量无法满足UE当前语音业务质量需求，则确定要对UE进行重定向操作。
第一基站一旦决定触发UE进行重定向操作，则第一基站向核心网发送UE上下文释放请求消息，该UE上下文释放请求消息中携带第一语音重定向原因指示信息，用于指示保留UE对应的GBR承载或者语音业务承载。
具体来说，第一基站向核心网中的MME发送UE上下文释放请求消息，也就是UE Context Release Request消息，在UE Context Release Request消息 中会携带释放原因字段，本申请中，在释放原因字段中新增加一个语音重定向原因指示信息，即第一语音重定向原因指示信息。该第一语音重定向指示信息用于指示核心网中的MME保留UE对应的GBR承载或者语音业务承载。
步骤310：MME接收第一基站发送的通知消息，所述通知消息包含保留用户设备UE对应的GBR承载或者语音业务承载的指示；MME按照所述通知消息，保留UE对应的GBR承载或者语音业务承载。
具体地，MME接收到第一基站发送的UE上下文释放请求消息，即UE Context Release Request消息，该UE Context Release Request消息中携带第一语音重定向原因指示信息。MME对该消息进行分析后，确定该消息中携带第一语音重定向原因指示信息，则按照该消息，在本地保留UE对应的GBR承载或者语音业务承载。
较佳地，MME会启动一个定时器，在定时器超时之前，在本地保留UE对应的GBR承载或者语音业务承载。
步骤320：MME通知网关设备保留UE对应的GBR承载或者语音业务承载。
MME不但在本地保留UE对应的GBR承载或者语音业务承载，还需要通知网关设备保留UE对应的GBR承载或者语音业务承载。
具体地，MME向网关设备发送悬挂承载消息，并接收网关设备反馈的针对悬挂承载消息的应答消息。悬挂承载消息即Suspend Notification，悬挂承载消息用于指示网关设备保留UE对应的GBR承载或者语音业务承载。
也就是，MME向SGW、PGW发送Suspend Notification，通知SGW、PGW将UE对应的GBR承载或者语音业务承载进行悬挂，MME接收到SGW、PGW返回的Suspend Acknowledge后，就可以确定SGW、PGW已将UE对应的GBR承载或者语音业务承载进行了悬挂。
这个过程由于网关设备对UE对应的GBR承载或者语音业务承载进行了悬挂，并不会触发该UE通信的对端UE进行语音会话的释放过程。
步骤330：MME向第一基站返回所述通知消息的响应消息。
具体地，MME针对第一基站发送的UE上下文释放请求消息，即UE Context Release Request消息，向第一基站返回UE上下文释放命令，即UE Context Release Command。
步骤340：第一基站指示UE保留UE对应的GBR承载或者语音业务承载。
第一基站向UE发送重定向消息，在重定向消息中携带指示UE保留UE对应的GBR承载或者语音业务承载的指示信息。
具体来说，第一基站在接收到核心网中的MME返回的UE上下文释放命令后，向UE发送RRC连接释放消息，即RRC Connection Release消息，该RRC Connection Release消息中携带第二语音重定向原因指示信息，用于指示UE保留所述UE对应的GBR承载或者语音业务承载。该RRC Connection Release消息中还携带了UE重定向的载波信息，用于指示UE重定向的新的基站的位置。其中，第一基站获知周围其他基站更适合接入UE，使得UE的语音业务质量得到满足。则在RRC Connection Release消息携带所述更适合接入UE的其他基站的载波信息。
其中，第一基站向UE发送的RRC Connection Release消息中会携带释放原因字段，本申请中，在释放原因字段中新增加一个语音重定向原因指示信息，即第二语音重定向指示信息，该第二语音重定向指示信息用于指示保留UE对应的GBR承载或者语音业务承载。
步骤350：UE接收到第一基站发送的重定向消息，重定向消息中携带第二语音重定向原因指示信息，UE保留UE对应的GBR承载或者语音业务承载。
具体地，UE接收第一基站发送的RRC Connection Release消息，解析该RRC Connection Release消息中的释放原因字段，确定存在第二语音重定向原因指示信息，则UE保留UE对应的GBR承载或者语音业务承载。
UE还可以根据该RRC Connection Release消息，获知重定向的载波信息。
至此，通过以上处理过程，可以保证UE侧、核心网侧均不释放UE对应 的语音业务承载，且对端UE也不会释放本次语音会话。
步骤360：UE根据重定向消息中包含的载波信息，接入第二基站。
具体地，UE根据第一基站发送的RRC Connection Release消息中包含的载波信息，重定向到第二基站。也就是，UE与第二基站之间建立RRC连接。
需要说明的是，第二基站可能与第一基站连接在同一个MME上，也可能，第二基站与第一基站连接在不同的MME上。以下先假设第二基站与第一基站连接在同一个MME上。
步骤370：MME接收到其他基站发送的UE初始信息的请求消息，即，UE Initial Message的请求消息。
所述其他基站也就是上述第二基站，即UE重定向后接入的基站。
步骤380：MME基于所述请求消息，向所述其他基站反馈初始UE上下文设置应答消息，以及向网关设备发送所述悬挂承载消息对应的解除悬挂承载消息；
其中，所述解除悬挂承载消息用于指示网关设备将保留的所述UE对应的GBR承载或者语音业务承载恢复使用；所述初始UE上下文设置应答消息中包含MME保留的所述UE对应的GBR承载或者语音业务承载信息，用于第二基站触发UE对应的GBR承载或者语音业务承载的建立。
具体地，MME接收到第二基站发送的UE Initial Message的请求消息后，向第二基站反馈Initial UE Context Setup Request消息，由于MME之前保留了UE对应的GBR承载或者语音业务承载，因此，MME在向第二基站反馈的Initial UE Context Setup Request消息中携带了之前保留的UE对应的GBR承载或者语音业务承载信息。
MME还向SGW、PGW发送Resume Notification消息，指示SGW、PGW对之前悬挂的UE对应的GBR承载或者语音业务承载解除悬挂，即恢复使用。
需要说明的是，29.274中有消息的具体定义，悬挂承载的消息：Suspend Notification，是MME发送给SGW的；解除悬挂承载的消息：Resume Notification，也是MME发送给SGW的。
第二基站在接收到MME发送的Initial UE Context Setup Request消息后，触发与UE之间建立语音业务承载。向UE发送建立UE对应的语音业务承载的配置信息。
以上步骤370～步骤380中，若第二基站与第一基站连接在不同的MME上，则UE接入第二基站后，会触发跟踪区更新(Tracking Area Update，TAU)过程，通过该过程，新MME可以从第一基站连接的原MME上获取UE上下文。因此，上述步骤370～步骤380的过程也适用于第二基站与第一基站连接在不同的MME这种情况。
步骤390：UE接收第二基站发送的建立所述UE对应的语音业务承载的配置信息，根据所述配置信息，与所述第二基站之间建立所述UE对应的语音业务承载。
这样，通过本申请上述的方法，保证UE在重定向到新的基站后，UE侧可以确保保留其语音业务承载，并且核心网由于保留了UE的语音业务承载，在收到重定向后的新基站的请求消息后，可以触发新基站在其与UE之间建立语音业务承载，一旦该语音业务承载建立好，UE就可以在该语音业务承载上进行语音业务，保证语音业务的顺利进行，避免了UE在重定向后掉话的问题。
下面结合具体的应用场景中的一个实施例对本申请再作进一步详细说明。
具体地，参阅图4所示，为本实施例中重定向过程中的具体流程图，其中SGW/PGW代表网关设备，SGW和PGW位于同一个实体中，在逻辑上可以分开。UE重定向之前的基站为eNB1，重定向之后的基站为eNB2。且eNB1和eNB2连接于同一个MME。
步骤400：eNB1触发对UE的重定向操作；
步骤401：eNB1向MME发送UE Context Release Request消息；
在该消息中携带一个指示信息，该指示信息用于指示对UE的GBR承载或者语音业务承载进行保留，例如，语音业务承载对应为QCI＝1的承载。具体地，在UE Context Release Request消息中携带释放原因字段，本申请中， 在该释放原因字段中增加一个语音重定向原因指示，表明本次发送的UE上下文释放请求消息的原因包括UE需要重定向到其他基站。
步骤402：MME保留UE对应的GBR承载或者语音业务承载；
步骤403：MME向SGW/PGW发送Suspend Notification消息；通知SGW/PGW将UE对应的GBR承载或者语音业务承载进行悬挂。
步骤404：SGW/PGW向MME反馈Suspend Acknowledge消息。
需要注意的是，这个过程并不会触发对端UE进行语音会话的释放。
步骤405：MME向eNB1返回UE Context Release Command。
步骤406：eNB1向UE发送RRC Connection Release消息，并在该消息中携带语音重定向原因指示信息；
该语音重定向原因指示信息用于通知UE保留其对应的GBR承载或者语音业务承载。
该RRC Connection Release消息中还携带了UE重定向的载波信息。
步骤407：UE收到RRC Connection Release消息后，保留其对应的语音业务承载。
步骤408：UE根据RRC Connection Release消息中携带的UE重定向的载波信息，重定向到eNB2，即与eNB2建立连接。
步骤409：eNB2向MME发送UE Initial Message的请求消息；
步骤410：MME向eNB2返回Initial UE Context Setup Request消息；
步骤411：MME向SGW/PGW发送Resume Notification消息，通知SGW/PGW对之前保留的UE对应的GBR承载或者语音业务承载解除悬挂。
步骤410和步骤411之间在时序上可以互换。
步骤412：eNB2与UE之间执行RRC连接重配置，以恢复eNB2与UE之间的语音业务承载。
基于同一发明构思，参阅图5所示，本申请提供的第一种重定向的装置50，用于执行图3所示的方法，装置50包括：确定单元51、通知单元52、指示单元53，其中：
确定单元51，用于确定要对用户设备UE进行重定向操作；
通知单元52，用于在所述确定单元51确定要对用户设备UE进行重定向操作后，通知核心网保留所述UE对应的保证比特率GBR承载或者语音业务承载；
指示单元53，用于在所述确定单元51确定要对用户设备UE进行重定向操作后，指示所述UE保留所述UE对应的GBR承载或者语音业务承载；
其中，所述GBR承载包括语音业务承载。
较佳的，通知单元52具体用于：
向移动性管理网元发送UE上下文释放请求消息，所述UE上下文释放请求消息中携带第一语音重定向原因指示信息，用于指示保留所述UE对应的GBR承载或者语音业务承载。
较佳的，指示单元53具体用于：
向所述UE发送无线资源控制RRC连接释放消息，所述RRC连接释放消息中携带第二语音重定向原因指示信息，用于指示保留所述UE对应的GBR承载或者语音业务承载。
较佳的，确定单元51具体用于：
在与所述UE之间的链路质量无法满足所述UE当前语音业务质量需求时，确定要对所述UE进行重定向操作。
基于同一发明构思，参阅图6所示，本申请提供的第二种重定向的装置60，用于执行图3所示的方法，装置60包括：接收单元61、保留单元62、通知单元63，其中，
接收单元61，用于接收基站发送的通知消息，所述通知消息包含保留用户设备UE对应的GBR承载或者语音业务承载的指示；
保留单元62，用于按照所述接收单元61接收到的通知消息，保留所述UE对应的GBR承载或者语音业务承载；
通知单元63，用于通知网关设备保留所述UE对应的GBR承载或者语音业务承载。
较佳的，接收单元61具体用于：
接收基站发送的UE上下文释放请求消息，所述UE上下文释放请求消息中携带语音重定向原因指示信息，用于指示保留所述UE对应的GBR承载或者语音业务承载。
较佳的，通知单元63具体用于：
向网关设备发送悬挂承载消息，所述悬挂承载消息用于指示网关设备保留所述UE对应的GBR承载或者语音业务承载。
较佳的，保留单元62具体用于：
启动定时器，在所述定时器超时之前，保留所述UE对应的GBR承载或者语音业务承载。
较佳的，接收单元61还用于：
接收到其他基站发送的所述UE初始信息的请求消息；
所述通知单元63还用于，在所述接收单元61接收到其他基站发送的所述UE初始信息的请求消息后，基于所述请求消息，向所述其他基站反馈初始UE上下文设置应答消息，以及，向所述网关设备发送所述悬挂承载消息对应的解除悬挂承载消息；其中，所述解除悬挂承载消息用于指示网关设备将保留的所述UE对应的GBR承载或者语音业务承载恢复使用；所述初始UE上下文设置应答消息中包含移动性管理网元保留的所述UE对应的GBR承载或者语音业务承载信息，用于所述其他基站触发所述UE对应的GBR承载或者语音业务承载的建立。
基于同一发明构思，参阅图7所示，本申请提供了第三种重定向的装置70，用于执行图3所示的方法，装置70包括：接收单元71、保留单元72。
接收单元71，用于接收到第一基站发送的重定向消息，所述重定向消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述装置对应的GBR承载或者语音业务承载；
保留单元72，用于保留所述装置对应的GBR承载或者语音业务承载。
较佳的，装置70还包括：接入单元73。
接入单元73，用于根据所述重定向消息中包含的载波信息，接入第二基站。
较佳的，装置70还包括：建立承载单元74。
建立承载单元74，用于在所述接收单元71接收所述第二基站发送的建立所述装置对应的GBR承载或者语音业务承载的配置信息，根据所述配置信息，与所述第二基站之间建立所述装置对应的GBR承载或者语音业务承载。
基于同一发明构思，参阅图8所示，本申请提供的第四种重定向的装置80，包括收发器81、处理器82、存储器83和总线84，收发器81、处理器82、存储器83均与总线84连接，其中，所述存储器83中存储一组程序，所述处理器82用于调用所述存储器83中存储的程序，使得所述装置80执行如图3提供的重定向的方法。
其中，在图8中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器82代表的一个或多个处理器和存储器83代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线提供接口。收发器81可以是多个元件，即包括发送机和收发机，提供用于在传输介质上与各种其他装置通信的单元。处理器82负责管理总线架构和通常的处理，存储器83可以存储处理器82在执行操作时所使用的数据。
基于同一发明构思，参阅图9所示，本申请提供了一种移动性管理网元90，包括收发器91、处理器92、存储器93和总线94，收发器91、处理器92、存储器93均与总线94连接，其中，所述存储器93中存储一组程序，所述处理器92用于调用所述存储器93中存储的程序，使得所述移动性管理网元90执行图3提供的重定向的方法。
其中，在图9中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器92代表的一个或多个处理器和存储器93代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之 类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线提供接口。收发器91可以是多个元件，即包括发送机和收发机，提供用于在传输介质上与各种其他装置通信的单元。处理器92负责管理总线架构和通常的处理，存储器93可以存储处理器92在执行操作时所使用的数据。
基于同一发明构思，参阅图10所示，本申请提供了一种用户设备100，包括收发器101、处理器102、存储器103和总线104，收发器101、处理器102、存储器103均与总线104连接，其中，所述存储器103中存储一组程序，所述处理器102用于调用所述存储器103中存储的程序，使得所述用户设备100执行如图3提供的重定向方法。
其中，在图10中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器102代表的一个或多个处理器和存储器103代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线提供接口。收发器101可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。处理器102负责管理总线架构和通常的处理，存储器103可以存储处理器102在执行操作时所使用的数据。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (27)

  1. 一种重定向的方法，其特征在于，包括：
    基站确定要对用户设备UE进行重定向操作后，通知核心网保留所述UE对应的保证比特率GBR承载或者语音业务承载；并
    指示所述UE保留所述UE对应的GBR承载或者语音业务承载；
    其中，所述GBR承载包括语音业务承载。
  2. 如权利要求1所述的方法，其特征在于，所述基站通知核心网保留所述UE对应的GBR承载或者语音业务承载，包括：
    所述基站向移动性管理网元发送UE上下文释放请求消息，所述UE上下文释放请求消息中携带第一语音重定向原因指示信息，所述第一语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
  3. 如权利要求2所述的方法，其特征在于，所述基站指示所述UE保留所述UE对应的GBR承载或者语音业务承载，包括：
    所述基站向所述UE发送无线资源控制RRC连接释放消息，所述RRC连接释放消息中携带第二语音重定向原因指示信息，所述第二语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
  4. 如权利要求1、2或3所述的方法，其特征在于，所述基站确定要对UE进行重定向操作，包括：
    所述基站在与所述UE之间的链路质量无法满足所述UE当前语音业务质量需求时，确定要对所述UE进行重定向操作。
  5. 一种重定向的方法，其特征在于，包括：
    移动性管理网元接收基站发送的通知消息，所述通知消息包含保留用户设备UE对应的GBR承载或者语音业务承载的指示；
    所述移动性管理网元按照所述通知消息，保留所述UE对应的GBR承载或者语音业务承载；并
    通知网关设备保留所述UE对应的GBR承载或者语音业务承载。
  6. 如权利要求5所述的方法，其特征在于，所述移动性管理网元接收基站发送的通知消息，所述通知消息包含保留用户设备UE对应的GBR承载或者语音业务承载的指示，包括：
    所述移动性管理网元接收所述基站发送的UE上下文释放请求消息，所述UE上下文释放请求消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
  7. 如权利要求5或6所述的方法，其特征在于，所述移动性管理网元通知网关设备保留所述UE对应的GBR承载或者语音业务承载，包括：
    所述移动性管理网元向所述网关设备发送悬挂承载消息，所述悬挂承载消息用于指示所述网关设备保留所述UE对应的GBR承载或者语音业务承载。
  8. 如权利要求5、6或7所述的方法，其特征在于，所述移动性管理网元按照所述通知消息，保留所述UE对应的GBR承载或者语音业务承载，包括：
    所述移动性管理网元启动定时器，在所述定时器超时之前，保留所述UE对应的GBR承载或者语音业务承载。
  9. 如权利要求7或8所述的方法，其特征在于，所述移动性管理网元向基站返回所述通知消息的响应消息之后，还包括：
    所述移动性管理网元接收到其他基站发送的所述UE初始信息的请求消息；
    所述移动性管理网元基于所述请求消息，向所述其他基站反馈初始UE上下文设置应答消息，以及，向所述网关设备发送所述悬挂承载消息对应的解除悬挂承载消息；其中，所述解除悬挂承载消息用于指示所述网关设备将保留的所述UE对应的GBR承载或者语音业务承载恢复使用；所述初始UE上下文设置应答消息中包含移动性管理网元保留的所述UE对应的GBR承载或者语音业务承载信息，用于所述其他基站触发所述UE对应的GBR承载或者语音业务承载的建立。
  10. 一种重定向的方法，其特征在于，包括：
    用户设备UE接收到第一基站发送的重定向消息，所述重定向消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载；
    所述UE保留所述UE对应的GBR承载或者语音业务承载。
  11. 如权利要求10所述的方法，其特征在于，还包括：
    所述UE根据所述重定向消息中包含的载波信息，接入第二基站。
  12. 如权利要求11所述的方法，其特征在于，所述方法还包括：
    所述UE接收所述第二基站发送的建立所述UE对应的GBR承载或者语音业务承载的配置信息，根据所述配置信息，与所述第二基站之间建立所述UE对应的GBR承载或者语音业务承载。
  13. 一种重定向的装置，其特征在于，包括：
    确定单元，用于确定要对用户设备UE进行重定向操作；
    通知单元，用于在所述确定单元确定要对用户设备UE进行重定向操作后，通知核心网保留所述UE对应的保证比特率GBR承载或者语音业务承载；
    指示单元，用于在所述确定单元确定要对用户设备UE进行重定向操作后，指示所述UE保留所述UE对应的GBR承载或者语音业务承载；
    其中，所述GBR承载包括语音业务承载。
  14. 如权利要求13所述的装置，其特征在于，所述通知单元具体用于：
    向移动性管理网元发送UE上下文释放请求消息，所述UE上下文释放请求消息中携带第一语音重定向原因指示信息，所述第一语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
  15. 如权利要求14所述的装置，其特征在于，所述指示单元具体用于：
    向所述UE发送无线资源控制RRC连接释放消息，所述RRC连接释放消息中携带第二语音重定向原因指示信息，所述第二语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
  16. 如权利要求13、14或15所述的装置，其特征在于，所述确定单元具体用于：
    在与所述UE之间的链路质量无法满足所述UE当前语音业务质量需求时，确定要对所述UE进行重定向操作。
  17. 一种重定向的装置，其特征在于，包括：
    接收单元，用于接收基站发送的通知消息，所述通知消息包含保留用户设备UE对应的GBR承载或者语音业务承载的指示；
    保留单元，用于按照所述接收单元接收到的通知消息，保留所述UE对应的GBR承载或者语音业务承载；
    通知单元，用于通知网关设备保留所述UE对应的GBR承载或者语音业务承载。
  18. 如权利要求17所述的装置，其特征在于，所述接收单元具体用于：
    接收基站发送的UE上下文释放请求消息，所述UE上下文释放请求消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述UE对应的GBR承载或者语音业务承载。
  19. 如权利要求17或18所述的装置，其特征在于，所述通知单元具体用于：
    向网关设备发送悬挂承载消息，所述悬挂承载消息用于指示网关设备保留所述UE对应的GBR承载或者语音业务承载。
  20. 如权利要求17、18或19所述的装置，其特征在于，所述保留单元具体用于：
    启动定时器，在所述定时器超时之前，保留所述UE对应的GBR承载或者语音业务承载。
  21. 如权利要求19或20所述的装置，其特征在于，所述接收单元还用于：
    接收到其他基站发送的所述UE初始信息的请求消息；
    所述通知单元还用于，在所述接收单元接收到其他基站发送的所述UE初始信息的请求消息后，基于所述请求消息，向所述其他基站反馈初始UE上下文设置应答消息，以及，向所述网关设备发送所述悬挂承载消息对应的解除 悬挂承载消息；
    其中，所述解除悬挂承载消息用于指示网关设备将保留的所述UE对应的GBR承载或者语音业务承载恢复使用；所述初始UE上下文设置应答消息中包含移动性管理网元保留的所述UE对应的GBR承载或者语音业务承载信息，用于所述其他基站触发所述UE对应的GBR承载或者语音业务承载的建立。
  22. 一种重定向的装置，其特征在于，包括：
    接收单元，用于接收到第一基站发送的重定向消息，所述重定向消息中携带语音重定向原因指示信息，所述语音重定向原因指示信息用于指示保留所述装置对应的GBR承载或者语音业务承载；
    保留单元，用于保留所述装置对应的GBR承载或者语音业务承载。
  23. 如权利要求22所述的装置，其特征在于，还包括：
    接入单元，用于根据所述重定向消息中包含的载波信息，接入第二基站。
  24. 如权利要求23所述的装置，其特征在于，还包括：
    建立承载单元，用于在所述接收单元接收所述第二基站发送的建立所述装置对应的GBR承载或者语音业务承载的配置信息，根据所述配置信息，与所述第二基站之间建立所述装置对应的GBR承载或者语音业务承载。
  25. 一种重定向的装置，其特征在于，包括收发器、处理器、存储器和总线，收发器、处理器、存储器均与总线连接，其中，所述存储器中存储一组程序，所述处理器用于调用所述存储器中存储的程序，使得所述装置执行如权利要求1-4任一项所述的方法。
  26. 一种移动性管理网元，其特征在于，包括收发器、处理器、存储器和总线，收发器、处理器、存储器均与总线连接，其中，所述存储器中存储一组程序，所述处理器用于调用所述存储器中存储的程序，使得所述移动性管理网元执行如权利要求5-9任一项所述的方法。
  27. 一种用户设备，其特征在于，包括收发器、处理器、存储器和总线，收发器、处理器、存储器均与总线连接，其中，所述存储器中存储一组程序，所述处理器用于调用所述存储器中存储的程序，使得所述用户设备执行如权 利要求10-12任一项所述的方法。
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