WO2012106896A1 - 一种语音回落的方法及设备 - Google Patents

一种语音回落的方法及设备 Download PDF

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Publication number
WO2012106896A1
WO2012106896A1 PCT/CN2011/077249 CN2011077249W WO2012106896A1 WO 2012106896 A1 WO2012106896 A1 WO 2012106896A1 CN 2011077249 W CN2011077249 W CN 2011077249W WO 2012106896 A1 WO2012106896 A1 WO 2012106896A1
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WO
WIPO (PCT)
Prior art keywords
radio access
access network
cell
network
service
Prior art date
Application number
PCT/CN2011/077249
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English (en)
French (fr)
Inventor
帅扬来
饶琼
胡春丽
秦亚莉
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/CN2011/077249 priority Critical patent/WO2012106896A1/zh
Priority to CN2011800011049A priority patent/CN102308629A/zh
Publication of WO2012106896A1 publication Critical patent/WO2012106896A1/zh

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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
    • H04W36/00224Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and device for voice fallback. Background art
  • a high-level radio access network uses an LTE (Long Term Evolution) network as an example.
  • LTE Long Term Evolution
  • a lower version of a radio access network uses a 2G or 3G network as an example.
  • An LTE network only supports PS (Packet Switching).
  • PS Packet Switching
  • the service does not support the CS (Circuit Switching) service.
  • the UE needs to perform the CS service in the LTE network, the UE needs to perform the voice fallback to the cell of the 2G or 3G network, and perform the operation in the 2G or 3G network.
  • CS business When the UE needs to perform the CS service in the LTE network, the UE needs to perform the voice fallback to the cell of the 2G or 3G network, and perform the operation in the 2G or 3G network.
  • the UE In the existing voice fallback method, the UE first registers and resides in the cell of the LTE network. If the UE detects that it needs to fall back to the 2G network or the 3G network for the CS service, the UE requests the network side to fall back to the 2G network or In the 3G network, the 2G network or the 3G network cell is measured and the system message is read according to the requirements of the network side, and then the measurement report of each cell is transmitted. After selecting a cell according to the measurement report, the network side sends an indication to the UE, and then the UE falls back to the cell selected by the network side to perform the CS service. It can be seen that the UE in the prior art takes a long time to complete the voice fallback process. Summary of the invention
  • the present invention provides a method and apparatus for voice fallback.
  • An aspect of the present invention provides a method for voice fallback, the method comprising:
  • the UE If the user equipment UE residing in the cell of the second radio access network stores the context information of the cell of the first radio access network, and determines that it needs to fall back to the first radio access network, the UE according to the The context information of the cell of the first radio access network is redirected to the cell of the first radio access network; wherein, the version of the second radio access network is higher than that of the first radio access network version.
  • Another aspect of the present invention provides a method for voice fallback, the method comprising:
  • the second radio access network device sends a circuit switched CS priority fallback indication to the UE, where the CS priority fallback indication is used to trigger the UE voice to fall back into the cell of the first radio access network.
  • Another aspect of the present invention provides an apparatus, the apparatus comprising:
  • the processor is configured to: when the device resides in a cell of the second radio access network, determine that the device needs to fall back to the first radio access network, and according to the first radio access network stored by the memory The context information of the cell is redirected to the cell of the first radio access network; wherein the version of the second radio access network is higher than the version of the first radio access network.
  • Another aspect of the present invention provides an apparatus, the apparatus comprising:
  • a receiver configured to receive a fallback indication sent by the user equipment UE, and an identifier of the UE, where the fallback indication is used to request the voice to fall back into the cell of the first radio access network, where the UE resides in the device control Within the second radio access network;
  • a processor configured to determine, according to the identifier of the UE, that the UE is registered in a cell of the first radio access network, and a transmitter, configured to send a circuit switched CS priority fallback indication to the UE, where the CS The priority fallback indication is used to trigger the UE voice to fall back into the cell of the first radio access network.
  • the UE residing in the cell of the second radio access network and storing the context information of the cell of the first radio access network, when the UE determines that the UE needs to fall back to the cell in the second radio access network.
  • the cell of the first radio access network is redirected to the cell of the first radio access network according to the context information of the cell of the first radio access network, it is not required to fall back to the first radio access network. Measuring the cell and reading the system message of the cell, reducing the time of voice fallback, and improving the efficiency of voice fallback.
  • FIG. 1 is a flowchart of a method for voice fallback provided by an embodiment of the present invention
  • FIG. 2 is a flow chart of a first method for voice fallback provided by another embodiment of the present invention.
  • FIG. 3 is a flowchart of a PS service being performed by a suspended UE according to another embodiment of the present invention
  • FIG. 4 is a flowchart of restoring a suspended PS service according to another embodiment of the present invention
  • FIG. 5 is a flowchart of a second method for voice fallback provided by another embodiment of the present invention
  • FIG. 6 is a flowchart of a method for dropping a voice according to another embodiment of the present invention.
  • Figure 7 is a schematic diagram of a first apparatus provided by another embodiment of the present invention.
  • Figure 8 is a schematic illustration of a first apparatus provided by another embodiment of the present invention. detailed description
  • An embodiment of the present invention provides a method for voice fallback, including: if a UE camping in a cell of a second radio access network stores context information of a cell of a first radio access network, and determines that it needs to fall back Going to the first radio access network, the UE is redirected to the cell of the first radio access network according to the context information of the cell of the first radio access network; wherein the version of the second radio access network is higher than the first The version of the wireless access network. For example, as shown in FIG.
  • step 101 it is first determined whether the UE camped in the cell of the second radio access network stores the context information of the cell of the first radio access network, and determines whether it needs to fall back to The first radio access network (step 101). If yes, it is redirected to the cell of the first radio access network according to the context information of the cell of the first radio access network (as in step 102).
  • the two determination actions in step 101 may be performed simultaneously, or may be performed one after another, for example: when the first determination result is YES, the second determination is performed, and the second determination result is Then, step 102 is performed; or, when the second determination result is YES, the first determination is performed, and when the first determination result is YES, step 102 is performed.
  • the method further includes:
  • the method further includes:
  • the UE After the UE registers with the cell of the first radio access network, the UE resides in the cell of the first radio access network;
  • the UE When the UE performs the PS service, it registers in the cell of the second radio access network and resides in the cell of the second radio access network; or
  • the method further includes:
  • the UE When registering to the cell of the first radio access network, the UE also registers with the cell of the second radio access network and camps in the cell of the second radio access network.
  • the method further includes:
  • the UE sends the dual-receive capability information to the second radio access network device, where the dual-receive capability information is used to indicate that the UE has been registered to the cell of the first radio access network and the cell of the second radio access network.
  • the method further includes: Sending, by the UE, a fallback indication and an identifier of the UE to the second radio access network device, where the fallback indication is used to request the voice to fall back into the cell of the first radio access network;
  • the UE receives the CS priority fallback indication sent by the second radio access network device, and the CS priority fallback indication is used to trigger the UE priority voice to fall back into the cell of the first radio access network.
  • the UE when the UE determines that it needs to fall back to the first radio access network, the UE performs the PS service in the cell of the second radio access network, and after the UE is redirected to the cell of the first radio access network, The method also includes:
  • the UE requests the second radio access network device to suspend the PS service.
  • the method further includes:
  • the UE After completing the CS service in the cell of the first radio access network, the UE requests the second radio access network device to resume the suspended PS service.
  • the UE residing in the cell of the second radio access network and storing the context information of the cell of the first radio access network, when the UE determines the need in the cell of the second radio access network
  • the context information of the cell of the first radio access network is redirected to the cell of the first radio access network, thereby falling back to the first radio access network. It is not necessary to measure the cell and read the system message of the cell, reduce the time of voice fallback, and improve the efficiency of voice fallback.
  • Another embodiment of the present invention provides a method of speech fallback.
  • the UE When the UE performs the PS service in the LTE network, if the CS service needs to be performed, the UE needs to fall back to the 2G network or the 3G network to perform the CS service; the process of the UE falling back from the LTE network to the 2G network may fall back from the LTE network.
  • the flow to the 3G network is the same. In this embodiment, the UE is only dropped back to the 2G network as an example. Referring to FIG. 2, the method includes:
  • Step 201 After the UE starts up, it registers with the cell of the 2G network by using an initial attach procedure, and stores context information of the cell of the 2G network.
  • the context information of the cell includes the identifier of the cell and the system message.
  • the UE measures the cell of the 2G network and reads the system message of the cell, and sends a measurement report to the network side, and the network side performs the measurement according to the measurement.
  • the report selects a cell and notifies the UE that the UE is registered in the cell selected by the network side, and the UE also stores the identifier and system message of the cell selected by the network side.
  • the UE When the UE performs the initial attach procedure, the UE also completes its own registration to the MSC (Mobile Services Switching Centre) and the registration of the MSC to the Home Subscriber Server (HSS), so that when the UE completes the initial attachment.
  • the MSC Mobile Services Switching Centre
  • HSS Home Subscriber Server
  • the MSC stores the identity and location information of the UE
  • the HSS stores the identity of the MSC registered by the UE, the address information and the identifier of the UE, and the like.
  • the UE may be divided into a CS-priority UE and a non-CS-priority UE, and the CS-priority UE is biased.
  • a UE that is not a CS-preferred UE is a UE that prefers to initiate a service through the PS domain.
  • the CS-prioritized UE is preferentially registered in the cell of the 2G network through the initial attach procedure, and resides in the cell of the 2G network, and the UE initiates an initial call to the LTE network until the UE needs to perform the PS service access.
  • the non-CS-first UE the UE is first registered in the cell of the 2G network through the initial attach procedure, and then step 202 is performed immediately to register in the cell of the LTE network.
  • Step 202 The UE scans and selects an LTE network, registers the cell in the LTE network by using an initial attach procedure, and stores context information of the cell of the LTE network.
  • the UE scans and selects the LTE network, and performs registration to the cell of the selected LTE network by performing an initial attach procedure, and the UE measures the cell of the LTE network and reads the system message of the cell in the process of performing the initial attach procedure.
  • the measurement report is sent to the network side, and the network side selects a cell according to the measurement report and notifies the UE, and the UE registers with the cell selected by the network side, and the UE also stores the identifier and system message of the cell selected by the network side.
  • the UE further completes the registration of the MME (Mobility Management Entity) and the MME to the HSS when the UE performs the initial process, so that after the UE registers with the cell selected by the network side, the MME stores the UE.
  • the identifier and location information, etc., the HSS stores the identity of the MME registered by the UE, the address information and the identifier of the UE, and the like.
  • Step 203 After the UE registers with the cell of the LTE network and the cell of the 2G network, the UE immediately sends the dual-receive capability information to the eNB (Envolved NodeB, the evolved base station);
  • the eNB End NodeB, the evolved base station
  • the UE is configured to have dual-receive single-issue capability, that is, the UE can be attached to the two access networks and can simultaneously receive data sent from the two access networks, but the UE can only be connected in one type.
  • the data is sent in the network, so in this embodiment, the UE may be attached to the cell of the LTE network and the cell of the 2G network.
  • Step 204 The eNB receives the dual-receive single-issue capability information sent by the UE, and stores the correspondence between the identifier of the UE and the cell of the 2G network to which the UE has been registered.
  • the UE may further store a correspondence between the identifier of the UE and a cell that the UE has registered to the LTE network. For example, when the UE performs the process of initially attaching to the cell of the LTE network, the UE establishes a connection with the eNB where the cell of the LTE network is located, and the eNB acquires the identifier of the UE; where the UE registers with the LTE network and the 2G network.
  • the UE may send the dual-receive capability information to the eNB through the connection with the eNB; after receiving the dual-receive capability information sent by the UE, the eBN sends the double-transmitted capability information according to the receiving UE.
  • the connection of the acquiring capability information determines the identifier of the UE, and stores the correspondence between the identifier of the UE and the received double-receiving capability information.
  • the UE sends the dual-receive capability information to the eNB, and the UE also needs to send the identity of the UE itself to the eNB;
  • the information of the acquiring capability and the identifier of the UE are stored, and the correspondence between the identifier of the UE and the information of the dual-receiving capability is stored.
  • a non-CS-first UE when it is registered in a cell of an LTE network, it resides in a cell of the LTE network. If a non-CS-priority UE needs to perform PS service, the non-CS-priority UE can directly reside in the UE. The PS service is performed in the cell of the LTE network.
  • the UE that is the priority of the CS is registered in the cell of the 2G network when it is registered in the cell of the 2G network. Only when the PS service needs to be performed, the UE registers with the cell of the LTE network through the initial attach procedure, and is in the LTE. The PS service is performed in the cell of the network.
  • the non-CS-priority UE may be registered in the cell of the LTE network through the initial attach procedure after starting the booting, and then select the 2G network and register in the cell of the 2G network by using the initial attach procedure. After completing the registration to the cell of the 2G network, the device re-accesses to the cell of the registered LTE network and camps in the cell of the LTE network.
  • the UE resides in the cell of the LTE network. If the UE needs to perform the PS service, the UE performs the PS service through the connection with the network side.
  • the UE may be in the LTE network for one or more of the following reasons: The UE needs to fall back to the cell in the 2G network for the CS service, including:
  • the UE performs location area handover. At this time, the UE needs to fall back from the cell of the LTE network to the cell of the 2G network, and perform location area update in the cell of the 2G network.
  • the UE updates the context information of the stored cell of the 2G network to the context information of the cell where the UE performs the location area update.
  • the registration period of the 2G network of the UE is out of date. At this time, the UE needs to fall back from the cell of the LTE network to the cell of the 2G network, and re-register in the cell of the 2G network.
  • the UE itself has a registration period of the 2G network.
  • the UE initiates the registration period of the 2G network in the UE and maintains the registration of the 2G network in order to maintain the connection with the 2G network.
  • the period expires, the UE needs to request to fall back to the cell of the 2G network to restart registration.
  • the UE acts as a called party and the calling party performs a voice session through the CS domain. At this time, the UE needs to fall back from the cell of the LTE network to the cell of the 2G network, and performs the CS domain and the calling party in the cell of the 2G network. Voice conversation.
  • the UE When the calling party performs a voice session with the UE through the CS domain, the UE is first paged. When the UE receives the paging, it detects that the calling party needs to perform a voice session with itself. First, the paging is sent to the MSC to which the UE belongs. Since the identity and location information of the UE are already stored in the MSC, when the MSC receives the call, the MSC sends the caller to the UE.
  • the MSC may obtain the location information of the UE from the identifier and location information of the stored UE according to the identifier of the UE carried in the paging, and send the paging directly to the UE according to the location information of the UE, instead of The paging needs to be sent to the MME first, and then sent by the MME to the UE.
  • the interface between the MME and the MSC does not need to be connected, thereby saving the cost of the operator.
  • Step 205 When detecting a cell that needs to fall back to the 2G network in the cell of the LTE network, the UE sends an extended service request message to the MME, and the extended service request message carries at least the CS fallback indication and the identifier of the UE.
  • the CS fallback indication is used to request that the voice fall back into the cell of the 2G network.
  • Step 206 The MME receives the extended service request message that carries the CS fallback indication and the identifier of the UE, and sends a UE context modification request message to the eNB, where the UE context modification request message carries the CS fallback indication and the identifier of the UE.
  • the MME receives the UE sending The extended service request message is determined according to the CS fallback indication and the identifier of the UE carried in the extended service request message, and the UE needs to perform voice fallback, and sends a UE context modification request message carrying the CS fallback indication and the identifier of the UE to the eNB.
  • Step 207 The eNB receives the UE context modification request message, and returns a UE context modification response message to the MME.
  • Step 209 The eNB determines, according to the identifier of the stored UE and the correspondence between the UE that the UE has registered to the 2G network, and the identifier of the UE, whether the UE is attached to the cell of the 2G network.
  • the eNB searches for the correspondence between the identifier of the UE and the cell that the UE has registered to the 2G network according to the identifier of the UE. If the cell of the corresponding 2G network is found, it is determined that the UE is attached to the cell of the 2G network.
  • Step 210 If the eNB determines that the UE is attached to the cell of the 2G network, the eNB sends an RRC connection release message that carries the CS priority fallback indication, where the CS priority fallback indication is used to trigger the UE to preferentially perform voice fallback.
  • Step 211 The UE receives the RRC connection release message, and performs step 212 according to the trigger of the CS priority fallback indication carried in the RRC connection release message.
  • the UE detects that the UE needs to fall back to the 2G network through the connection with the network side in the LTE network, the UE releases the connection with the network side after receiving the RRC connection release message.
  • Step 212 The UE redirects to the cell of the registered 2G network according to the context information of the cell of the stored 2G network, and performs corresponding CS service in the cell of the 2G network.
  • the UE after the UE is registered in the cell of the 2G network and stores the context information of the cell of the 2G network, including the identifier of the cell and the system message, after the UE receives the RRC connection release message, Directly redirecting to the cell of the registered 2G network according to the identifier of the stored cell and the system message, and no need to measure the system message of the cell and the read cell, thereby reducing the time for the UE to perform voice fallback, and improving the voice fallback. s efficiency.
  • the UE After the UE is redirected to the cell of the 2G network, the UE establishes a connection with the network side in the cell of the 2G network, and performs the CS service through the connection, including:
  • the UE If the UE needs to perform location area update in the 2G network, the UE initiates a location update procedure in the cell of the registered 2G network;
  • the UE If the UE needs to perform periodic registration in the 2G network, the UE initiates a re-registration process in the cell of the registered 2G network;
  • the UE If the UE needs to perform a voice session with the calling party through the CS domain, the UE acts as a called party to start a voice session through the CS domain in the cell of the registered 2G network.
  • the UE may further perform step 213.
  • Step 213 The UE sends a PS service suspension request message to the SGSN (Serving GPRS (General Packet Radio Service) Support Node, the serving GPRS support node), and the PS service suspension request message carries the identifier of the UE.
  • the SGSN Serving GPRS (General Packet Radio Service) Support Node, the serving GPRS support node
  • the PS service suspension request message carries the identifier of the UE.
  • Step 214 The SGSN receives the PS service suspension request message, and carries the identifier of the UE according to the PS service suspension request message, so that the MME suspends the PS service that the UE is performing, and triggers the HSS to set the state of the MME to the suspended state. Select the steps.
  • the SGSN may suspend the MME according to the following procedures (A) - (E).
  • the PS service, and the triggering HSS sets the state of the MME to the suspended state, including:
  • the SGSN After receiving the PS service suspension request message, the SGSN sends a suspension trigger command message to the MME, and the suspension trigger command message carries the PS service suspension request message carrying the identifier of the UE;
  • the MME receives the suspension trigger command message, and according to the suspension trigger command message, carries the identity of the UE, and suspends the ongoing PS service of the UE;
  • the MME When the UE performs the PS service, the MME stores the identifier of the UE and the PS service corresponding to the UE. Therefore, the MME can obtain the PS service that the UE is performing according to the identifier of the UE.
  • the MME sends a setup status request message to the HSS, and the setup status request message carries at least a suspension indication, an identifier of the UE, and an identifier of the MME.
  • the HSS receives the setting status request message, sets the MME status to a suspended state according to the suspension indication carried in the setting status request message, and saves the identifier of the UE, the identifier of the MME, and the corresponding suspension state of the setting.
  • the MME receives the PS service suspension request message carrying the identifier of the UE to the MME, and the MME receives the PS service, when the eNB sends the RRC connection release message to the UE.
  • Suspension request message according to the PS service suspension request message carrying the identity of the UE, suspending the ongoing PS service of the UE, and sending a setup status request message to the HSS; in addition, the UE directly redirects to the RRC connection release message sent by the eNB In the cell of the registered 3G network, there is no need to send a PS service suspension request message.
  • the SMS-GMSC Short Message Service Gateway MSC
  • the SMS-GMSC sends an inquiry request message carrying the identifier of the UE to the HSS, the query request message.
  • the MME address is used to request the UE to belong to the HSS.
  • the HSS detects the UE according to the identifier of the UE and the identity of the UE, the identifier of the MME, and the suspension state.
  • the status of the MME is the hang state, and the HSS does not return the address of the MME to which the UE belongs to the SMS-GMSC, so the SMS-GMSC will not send the short message to the UE, so that the UE does not affect the ongoing CS service. .
  • the UE may re-access to the cell of the LTE network, and continue to perform the suspended PS service. That is, the UE can perform the following step 215.
  • Step 215 When performing the CS service, the UE re-accesses to the cell of the LTE network according to the stored context information of the LTE network, and sends a NAS (Non Access Stratum, non-access stratum) message carrying the identity to the MME; This step is an optional step.
  • NAS Non Access Stratum, non-access stratum
  • Step 216 After receiving the NAS message, the MME restores the suspended PS service according to the identifier of the UE carried in the NAS message, and cancels the HSS to the suspended state set by itself. This step is an optional step.
  • the MME notifies the HSS to cancel the suspension state set for itself, and can be divided into the following steps (a) - (c), including:
  • the MME receives the NAS message sent by the UE, and restores the suspended PS service according to the identifier of the UE carried in the NAS message;
  • the MME obtains the corresponding PS service according to the NAS message carrying the identifier of the UE, and restores the acquired PS service.
  • the MME sends a cancel status request message to the HSS, and the cancel status request message carries a recovery indication, an identifier of the UE, and an identifier of the MME;
  • the HSS receives the cancel status request message, and deletes the identity of the UE, the identity of the MME, and the pair of suspension states. Should be related, and send a cancel status response message to the MME;
  • Step 217 The UE continues to perform the recovered PS service in the cell of the accessed LTE network. This step is optional.
  • the method provided in this embodiment is also applicable to the cell that the UE falls back from the cell of the 3G network to the cell of the 2G network, and the process of specific fallback is not described in detail.
  • the UE is registered in the LTE network cell, and is also registered in the cell of the 2G network, and stores the context information of the cell of the LTE network and the context information of the cell of the 2G network, when the UE is in the cell of the LTE network.
  • the UE directly redirects to the cell of the registered 2G network according to the context information of the cell of the 2G network, so that the cell of the 2G network is not needed in the process of falling back to the 2G network.
  • Another embodiment of the present invention provides a method of speech fallback.
  • the UE When the UE performs the PS service in the LTE network, if the CS service needs to be performed, the UE needs to fall back to the 2G network or the 3G network for the CS service; the process of the UE falling back from the LTE network to the 2G network and the UE falling back from the LTE network to The process of the 3G network is basically the same. In this embodiment, the UE is dropped back to the 2G network as an example. Referring to FIG. 5, the method includes:
  • Steps 301-304 The same as steps 201-204 of Embodiment 2, respectively, and will not be described in detail herein;
  • Step 305 If the UE detects that the location area handover of the UE occurs or the registration period of the 2G network expires and needs to fall back to the 2G network, the UE sends an extended service request message to the MME, and the extended service request message is carried. Session maintenance indication and identity of the UE;
  • the UE When the location area switching occurs, the UE needs to be switched to another cell through the location update procedure to maintain the session with the 2G network; when the registration period of the 2G network of the UE is exceeded, the re-registration process needs to be maintained between the 2G network and the 2G network. The session, and the location update process and the re-registration process take less time. Therefore, the UE notifies the network side through the session maintenance indication that the network side falls back to the 2G network to maintain the session with the 2G network. It is not necessary to switch the ongoing PS service.
  • Step 306 The MME receives the extended service request message, and sends a UE context modification request message to the eNB, and the UE context modification request message carries the session maintenance indication carried by the extended service request message and the identifier of the UE.
  • the MME determines that the UE needs to fall back to the 2G network due to the session between the maintenance and the 2G network, and then sends the UE according to the session maintenance indication and the identifier of the UE carried in the extended service request message.
  • a context modification request message is sent to the eNB.
  • Step 307 The eNB receives the UE context modification request message, and returns a UE context modification response message to the MME.
  • Step 308 The eNB determines, according to the session maintenance indication carried by the UE context modification request message and the identifier of the UE, that the UE needs to perform session maintenance and performs voice fallback, and step 309 is performed;
  • Step 309 The eNB determines, according to the stored identifier and the correspondence between the UE and the UE that has been registered to the 2G network, and the identifier of the UE, whether the UE is attached to the cell of the 2G network.
  • the eNB searches for the correspondence between the identifier of the UE and the cell that the UE has registered to the 2G network according to the identifier of the UE. If the cell of the corresponding 2G network is found, it is determined that the UE has the capability of double-receiving and transmitting, and determines The UE has been attached to the cell of the 2G network.
  • Step 310 If the eNB determines that the UE is attached to the cell of the 2G network, the eNB sends an RRC connection release message that carries the CS priority fallback indication, where the CS priority fallback indication is used to trigger the UE to preferentially perform voice fallback.
  • Steps 311-317 are the same as steps 211-217 of Embodiment 2, and will not be described in detail herein.
  • the method provided in this embodiment is also applicable to the cell that the UE falls back from the cell of the 3G network to the cell of the 2G network, and the process of specific fallback is not described in detail.
  • the UE is registered in the LTE network cell and is also registered in the cell of the 2G network.
  • the UE detects that it needs to fall back to the 2G network for session maintenance in the process of performing the PS service in the cell of the LTE network.
  • the UE After receiving the RRC connection release message sent by the eNB, the UE directly redirects to the cell of the attached 2G network, and does not need to measure the cell of the 2G network and the system message of the cell that reads the 2G network during the process of falling back to the 2G network. Therefore, the time for voice fallback is reduced, and the efficiency of voice fallback is improved.
  • another embodiment of the present invention provides a method for voice fallback, including:
  • Step 401 The second radio access network device that the UE camps on receives the fallback indication sent by the UE and the identifier of the UE, where the fallback indication is used to request the voice to fall back into the cell of the first radio access network;
  • Step 402 The second radio access network device according to the stored identifier of the UE and the corresponding information of the dual-received sending capability information And the identity of the UE determines that the UE has been registered in the cell of the first radio access network;
  • Step 403 The second radio access network device sends a CS priority fallback indication to the UE, where the CS priority fallback indication is used to trigger the UE voice to fall back into the cell of the first radio access network.
  • the method further includes:
  • the second radio access network device stores the correspondence between the identifier of the UE and the cell of the first radio access network to which the UE has been registered; and/or,
  • the second radio access network device stores the correspondence between the identity of the UE and the cell of the second radio access network to which the UE has registered.
  • the method further includes:
  • the second radio access network device receives the dual-receive single-issue capability information sent by the UE, where the dual-receive single-issue capability information is used to indicate that the UE has been registered to the cell of the first radio access network, and/or The cell of the second radio access network.
  • the method further includes:
  • the second radio access network device suspends the ongoing packet switched PS service of the UE.
  • the method further includes:
  • the suspended PS service is recovered.
  • the network side determines that the UE has been registered to the first radio networked cell, and then sends the CS priority fallback indication to the UE, and triggers the UE to preferentially fall back to the cell of the first radio access network, and the network side does not require
  • the UE measures the system message of the cell and the read cell, so that the UE does not need to measure the cell and read the system message of the cell in the process of falling back to the first radio access network, reducing the time for the voice to fall back, and improving the efficiency of the voice fallback.
  • another embodiment of the present invention provides an apparatus, including: a processor 501 and a memory 502.
  • the processor 501 is configured to determine when the device resides in a cell of the second radio access network. The device needs to fall back to the first radio access network, and is redirected to the cell of the first radio access network according to the context information of the cell of the first radio access network stored by the memory 502; wherein, the second radio access The version of the network is higher than the version of the first radio access network.
  • the processor 401 is configured to store the context information of the cell of the first radio access network in the memory 502 when the device registers with the cell of the first radio access network.
  • the device further includes a transceiver
  • the transceiver is configured to send dual-receive capability information to the second radio access network device; and/or, to send the fallback indication and the identifier of the device to the second radio access network device, and receive the second radio access network
  • the dual-receiving capability information is used to indicate that the device has been registered to the cell of the first radio access network and the second a cell of the line access network; the fallback indication is used to request the voice to fall back to the cell of the first radio access network; the CS priority fallback indication is used to trigger the device to return the priority voice to the cell of the first radio access network.
  • the transceiver is further configured to request the second radio access network device to suspend the ongoing PS service when the processor 501 determines that the device needs to fall back to the first radio access network.
  • the transceiver is further configured to request the second radio access network device to resume the suspended PS service after the CS service in the cell of the first radio access network is completed.
  • the device provided in this embodiment may be a user equipment UE.
  • the device may be used to implement the actions performed by the UE in the method provided in the foregoing embodiment, and details are not described herein again.
  • the UE residing in the cell of the second radio access network and storing the context information of the cell of the first radio access network, when the UE determines the need in the cell of the second radio access network
  • the context information of the cell of the first radio access network is redirected to the cell of the first radio access network, thereby falling back to the first radio access network. It is not necessary to measure the cell and read the system message of the cell, reduce the time of voice fallback, and improve the efficiency of voice fallback.
  • another device of the present invention includes:
  • the receiver 601 is configured to receive a fallback indication sent by the UE and an identifier of the UE, where the fallback indication is used to request the voice to fall back into the cell of the first radio access network, where the UE resides in the second wireless controlled by the device.
  • Access network
  • the processor 602 is configured to determine, according to the identifier of the UE, that the UE is registered in the cell of the first radio access network, and the transmitter 603 is configured to send a CS priority fallback indication to the UE, where the CS priority fallback indication is used for triggering.
  • the UE voice falls back to the cell of the first radio access network.
  • the device further includes a memory
  • a memory configured to store a correspondence between an identifier of the UE and a cell of the first radio access network to which the UE has been registered, and/or an identifier of the UE and a second radio access to which the UE has been registered Correspondence relationship of cells of the network.
  • the processor 602 is further configured to suspend the ongoing PS service of the UE, and/or restore the suspended PS service of the UE.
  • the device provided in this embodiment may be a network side device, such as an eNB.
  • the device may be used to implement the actions performed by the eNB in the method provided in the foregoing embodiment, and details are not described herein again.
  • the network side determines that the UE has been registered to the first radio networked cell, and then sends the CS priority fallback indication to the UE, and triggers the UE to preferentially fall back to the cell of the first radio access network, and the network side does not require
  • the UE measures the system message of the cell and the read cell, so that the UE does not need to measure the cell and read the system message of the cell in the process of falling back to the first radio access network, reducing the time for the voice to fall back, and improving the efficiency of the voice fallback.

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Description

种语音回落的方法及设备 技术领域
本发明涉及通信领域, 特别涉及一种语音回落的方法及设备。 背景技术 说
随着通信技术的发展, 在某些话务热点的地区, 存在高低不同版本的无线接入网并存; 当 UE (User Equipment, 用户设备) 驻留在高版本的无线接入网的小区中需要进行高版本 的无线接入网不支持的业务时, UE需要进行语音回落到低版本的无线接入网的小区中进行 该业务。 书
例如, 高版本的无线接入网以 LTE (Long Term Evolution, 长期演进) 网络为例, 低版 本的无线接入网以 2G或 3G网络为例, LTE网络只支持 PS (Packet Switching, 分组交换) 业务而不支持 CS (Circuit Switching, 电路交换)业务, 当 UE驻留在 LTE网络中需要进行 CS业务时, UE需要进行语音回落到 2G或 3G网络的小区中, 并在 2G或 3G网络中进行 CS业务。
现有的语音回落的方法中, UE先注册并驻留在 LTE网络的小区中, 如果 UE检测出需 要回落到 2G网络或 3G网络中进行 CS业务时, UE向网络侧请求回落到 2G网络或 3G网 络中, 并按照网络侧的要求测量 2G网络或 3G网络小区以及读取系统消息, 然后发送每个 小区的测量报告。 网络侧根据测量报告选择一个小区后发送指示给 UE, 然后 UE才回落到 网络侧选择的小区中进行 CS业务。 可见, 现有技术中的 UE需要较长的时间才能完成语音 回落过程。 发明内容
为了减少语音回落的时间, 本发明提供了一种语音回落的方法及设备。
本发明的一方面提供一种语音回落的方法, 所述方法包括:
如果驻留在第二无线接入网的小区中的用户设备 UE存储有第一无线接入网的小区的 上下文信息, 且确定需要回落到第一无线接入网, 则所述 UE根据所述第一无线接入网的小 区的上下文信息, 重定向到所述第一无线接入网的小区中; 其中, 所述第二无线接入网的 版本高于所述第一无线接入网的版本。 本发明的另一方面提供一种语音回落的方法, 所述方法包括:
用户设备 UE驻留的第二无线接入网设备接收所述 UE发送的回落指示和所述 UE的标 识, 所述回落指示用于请求语音回落到第一无线接入网的小区中;
所述第二无线接入网设备根据所述 UE的标识确定所述 UE已注册到所述第一无线接入 网的小区中;
所述第二无线接入网设备发送电路交换 CS优先回落指示给所述 UE, 所述 CS优先回 落指示用于触发所述 UE语音回落到所述第一无线接入网的小区中。
本发明的另一方面提供一种设备, 所述设备包括:
所述处理器用于所述设备驻留在第二无线接入网的小区中时, 确定所述设备需要回落 到第一无线接入网, 并根据所述存储器存储的第一无线接入网的小区的上下文信息, 重定 向到所述第一无线接入网的小区中; 其中, 所述第二无线接入网的版本高于所述第一无线 接入网的版本。
本发明的另一方面提供一种设备, 所述设备包括:
接收器, 用于接收用户设备 UE发送的回落指示和所述 UE的标识, 所述回落指示用于 请求语音回落到第一无线接入网的小区中,所述 UE驻留在所述设备控制的第二无线接入网 内;
处理器,用于根据所述 UE的标识确定所述 UE已注册到所述第一无线接入网的小区中; 发送器, 用于发送电路交换 CS优先回落指示给所述 UE, 所述 CS优先回落指示用于 触发所述 UE语音回落到所述第一无线接入网的小区中。
上述技术方案中, UE驻留在第二无线接入网的小区中且存储有第一无线接入网的小区 的上下文信息,当 UE在第二无线接入网的小区中确定出需要回落到第一无线接入网的小区 时, 根据第一无线接入网的小区的上下文信息重定向到第一无线接入网的小区中, 从而在 回落到第一无线接入网的过程中不需要测量小区以及读取小区的系统消息, 减少语音回落 的时间, 提高语音回落的效率。 附图说明
图 1是本发明的一个实施例提供的一种语音回落的方法流程图;
图 2是本发明的另一个实施例提供的第一种语音回落的方法流程图;
图 3是本发明的另一个实施例提供的悬挂 UE正在进行的 PS业务的流程图; 图 4是本发明的另一个实施例提供的恢复悬挂的 PS业务的流程图;
图 5是本发明的另一个实施例提供的第二种语音回落的方法流程图; 图 6是本发明的另 个实施例提供的第 种语音回落的方法流程图;
图 7是本发明的另 个实施例提供的第 种设备示意图;
图 8是本发明的另 个实施例提供的第 种设备示意图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本发明实施方式作 进一步地详细描述。 本发明的一个实施例提供了一种语音回落的方法, 包括: 如果驻留在第二无线接入网 的小区中的 UE存储有第一无线接入网的小区的上下文信息,且确定需要回落到第一无线接 入网,则 UE根据第一无线接入网的小区的上下文信息,重定向到第一无线接入网的小区中; 其中, 第二无线接入网的版本高于第一无线接入网的版本。 例如, 如图 1 所示, 该实施例 中,先判断驻留在第二无线接入网的小区中的 UE是否存储有第一无线接入网的小区的上下 文信息, 以及判断是否需要回落到第一无线接入网 (如步骤 101 )。 如果是, 再根据第一无 线接入网的小区的上下文信息, 重定向到第一无线接入网的小区中 (如步骤 102)。 其中, 步骤 101 中的两个判断动作可以同时进行, 也可以一先一后进行, 例如: 在上述第一判断 结果为是时再做上述第二个判断, 在上述第二个判断结果为是时再执行步骤 102; 或者, 在 上述第二判断结果为是时再做上述第一个判断, 在第一个判断结果为是时再执行步骤 102。
进一步地, 该方法还包括:
UE注册到第一无线接入网的小区时, 存储第一无线接入网的小区的上下文信息。 可选的, 如果 UE为 CS优先的 UE, 该方法还包括:
UE注册到第一无线接入网的小区之后, 驻留在第一无线接入网的小区中;
UE进行 PS业务时, 注册到第二无线接入网的小区中, 并驻留在第二无线接入网的小 区中; 或者,
可选的, 如果 UE为非 CS优先的 UE, 则该方法还包括:
UE在注册到第一无线接入网的小区时, 还注册到第二无线接入网的小区, 并驻留在第 二无线接入网的小区中。
可选的, UE确定需要回落到第一无线接入网之前, 该方法还包括:
UE发送双收单发能力信息给第二无线接入网设备, 该双收单发能力信息用于指示 UE 已注册到第一无线接入网的小区和第二无线接入网的小区。
可选的, UE确定需要回落到第一无线接入网之后, 该方法还包括: UE发送回落指示和 UE的标识给第二无线接入网设备, 该回落指示用于请求语音回落 到第一无线接入网的小区中;
UE接收第二无线接入网设备发送的 CS优先回落指示, CS优先回落指示用于触发 UE 优先语音回落到第一无线接入网的小区中。
可选的, UE确定需要回落到第一无线接入网时, UE正在第二无线接入网的小区中进 行 PS业务, 则 UE重定向到所述第一无线接入网的小区中之后, 该方法还包括:
UE请求第二无线接入网设备悬挂 PS业务。
可选的, 该方法还包括:
UE在第一无线接入网的小区中的 CS业务完成后, 请求第二无线接入网设备恢复所述 悬挂的 PS业务。
在本发明实施例中, UE驻留在第二无线接入网的小区中且存储有第一无线接入网的小 区的上下文信息,当 UE在第二无线接入网的小区中确定出需要回落到第一无线接入网的小 区时, 根据第一无线接入网的小区的上下文信息重定向到第一无线接入网的小区中, 从而 在回落到第一无线接入网的过程中不需要测量小区以及读取小区的系统消息, 减少语音回 落的时间, 提高语音回落的效率。 本发明的另一个实施例提供了一种语音回落的方法。 其中, UE在 LTE网络中进行 PS 业务时, 如果有 CS业务需要进行,则 UE需要回落到 2G网络或 3G网络进行 CS业务; UE 从 LTE网络回落到 2G网络的流程可以与 UE从 LTE网络回落到 3G网络的流程相同,而在 本实施例中, 仅以 UE回落到 2G网络为例进行说明, 参见图 2, 该方法包括:
步骤 201 : UE开机启动后通过初始附着流程注册到 2G网络的小区, 并存储该 2G网络 的小区的上下文信息;
其中, 小区的上下文信息包括小区的标识和系统消息; UE在进行初始附着流程时, UE 会测量 2G网络的小区并读取小区的系统消息, 发送测量报告给网络侧, 网络侧再根据该测 量报告选择一个小区并通知 UE, UE注册到网络侧选择的小区中, 同时 UE还存储网络侧 选择的小区的标识和系统消息等。
其中, UE在进行初始附着流程时, UE还完成自身到 MSC ( Mobile Services Switching Centre, 移动交换中心) 的注册和 MSC到 HSS ( Home Subscriber Server, 用户归属服务 器) 的注册, 使得当 UE完成初始附着流程后, MSC存储有 UE的标识和位置信息等, 以 及 HSS存储 UE注册的 MSC的标识、 UE的地址信息和标识等。
需要说明的是, UE可以分为 CS优先的 UE和非 CS优先的 UE, CS优先的 UE为偏向 于通过 CS域来发起业务的 UE, 非 CS优先的 UE为偏向于通过 PS域来发起业务的 UE。 本实施例中, 对于 CS优先的 UE, 优先通过初始附着流程注册到 2G网络的小区中, 并驻 留在 2G网络的小区中, 直到 UE需要进行 PS业务访问的时候, 才向 LTE网络发起初始附 着流程; 而对于非 CS优先的 UE, 先通过初始附着流程注册到 2G网络的小区中, 然后再 立刻执行步骤 202以注册到 LTE网络的小区中。
步骤 202: UE扫描并选择 LTE网络,通过初始附着流程注册到 LTE网络的小区中并存 储该 LTE网络的小区的上下文信息;
其中, UE 扫描并选择 LTE网络, 通过执行初始附着流程来注册到选择的 LTE网络的 小区中, 且 UE在执行初始附着流程的过程中, UE会测量 LTE网络的小区并读取小区的系 统消息, 发送测量报告给网络侧, 网络侧再根据该测量报告选择一个小区并通知 UE, UE 注册到网络侧选择的小区中, 同时 UE还存储网络侧选择的小区的标识和系统消息等。
其中, UE在进行初始流程时, UE还完成自身到 MME (Mobility Management Entity, 移动管理实体) 的注册以及 MME到 HSS的注册, 使得当 UE注册到网络侧选择的小区后, MME存储有 UE的标识和位置信息等, HSS会保存 UE注册的 MME的标识、 UE的地址信 息和标识等。
步骤 203: UE注册到 LTE网络的小区和 2G网络的小区后, 立即发送双收单发能力信 息给 eNB (Envolved NodeB, 演进的基站);
其中, 在本实施例中, 设置 UE具有双收单发能力, 即 UE可以附着在两种接入网中并 可以同时接收来自两种接入网发送的数据,但 UE只可以在一种接入网中发送数据,所以在 本实施例中, UE可以附着在 LTE网络的小区和 2G网络的小区中。
步骤 204: eNB接收 UE发送的双收单发能力信息, 存储 UE的标识和 UE已注册到的 2G网络的小区的对应关系;
进一步地, UE还可以存储 UE的标识和 UE已注册到 LTE网络的小区的对应关系。 例如, 当 UE在进行初始附着到 LTE网络的小区的流程的过程中, UE与该 LTE网络的 小区所在的 eNB建立连接, 且 eNB会获取 UE的标识; 其中, UE注册到 LTE网络和 2G 网络后且在 UE释放与 eNB之间的连接之前, UE可以通过与 eNB之间的连接发送双收单 发能力信息给 eNB; eBN接收 UE发送的双收单发能力信息后,根据接收 UE发送双收单发 能力信息的连接确定出 UE的标识,并存储 UE的标识和接收的双收单发能力信息的对应关 系。
又如, 如果 UE注册到 LTE网络和 2G网络以及 UE释放掉与 eNB之间的连接后, UE 发送双收单发能力信息给 eNB,此时 UE还需要发送 UE自身的标识给 eNB; eNB接收到双 收单发能力信息和 UE的标识, 存储 UE的标识和双收单发能力信息的对应关系。
其中, 对于非 CS优先的 UE, 当注册在 LTE网络的小区中, 就驻留在 LTE网络的小区 中, 如果非 CS优先的 UE需要进行 PS业务时, 非 CS优先的 UE可以直接在驻留的 LTE 网络的小区中进行 PS业务。
其中, 对于 CS优先的 UE当注册在 2G网络的小区中, 就驻留在 2G网络的小区中, 只有需要进行 PS业务时, UE才通过初始附着流程注册到 LTE网络的小区中, 并在 LTE网 络的小区中进行 PS业务。
进一步地, 在本实施例中, 对于非 CS优先的 UE可以当开机启动后先通过初始附着流 程注册到 LTE网络的小区中,然后再选择 2G网络并通过初始附着流程注册到 2G网络的小 区中, 当完成注册到 2G网络的小区后再重新接入到已注册的 LTE网络的小区中,并在 LTE 网络的小区中驻留。
其中, UE驻留在 LTE网络的小区中, 如果 UE需要进行 PS业务, 则 UE通过与网络 侧的连接来进行 PS业务。
其中, UE驻留在 LTE网络中可能有如下的一种或多个原因导致 UE需要回落到 2G网 络的小区中进行 CS业务, 包括:
( 1 )、 UE发生位置区域切换, 此时 UE需要从 LTE网络的小区中回落到 2G网络的小 区, 并在 2G网络的小区中进行位置区域更新。
进一步地, 当 UE进行完位置区域更新后, UE将已存储的 2G网络的小区的上下文信 息更新为 UE进行完位置区域更新后所在小区的上下文信息。
(2)、 UE的 2G网络的注册周期超期, 此时 UE需要从 LTE网络的小区中回落到 2G 网络的小区中, 并在 2G网络的小区中重新进行注册。
其中, UE自身内有 2G网络的注册周期, 当 UE驻留在 LTE网络的小区中, UE为了 保持与 2G网络的连接, UE会启动自身内的 2G网络的注册周期并每当 2G网络的注册周期 超期时 UE就需要请求回落到 2G网络的小区中重新开始注册。
(3 )、UE通过 CS域主动呼叫其他用户,此时 UE需要从 LTE网络的小区中回落到 2G 网络的小区中, 并在 2G网络的小区中通过 CS域发起呼叫流程;
(4)、 UE作为被叫与主叫通过 CS域进行语音会话, 此时 UE需要从 LTE网络的小区 中回落到 2G网络的小区中, 并在 2G网络的小区中通过 CS域与主叫进行语音会话。
其中, 主叫要与 UE通过 CS域进行语音会话时, 首先寻呼 UE, 当 UE接收到寻呼后, 才检测出有主叫需要与自身进行语音会话; 其中, 主叫寻呼 UE时, 首先将寻呼发送到 UE 归属的 MSC, 由于 MSC中已存储 UE的标识和位置信息,所以当 MSC接收主叫发送给 UE 的寻呼时, MSC可以根据该寻呼中携带 UE的标识, 从已存储 UE的标识和位置信息中获 取 UE的位置信息, 并根据 UE的位置信息将该寻呼直接发送给 UE, 而不需要将该寻呼先 发送给 MME, 再由 MME发送给 UE, 所在在本实施例中, MME与 MSC之间不需要有接 口连接, 从而节省了运营商的成本。
步骤 205 : UE当在 LTE网络的小区中检测出需要回落到 2G网络的小区时, 发送扩展 业务请求消息给 MME, 且该扩展业务请求消息至少携带 CS回落指示和 UE的标识;
其中, CS回落指示用于请求语音回落到 2G网络的小区中。
步骤 206: MME接收携带 CS回落指示和 UE的标识的扩展业务请求消息, 发送 UE上 下文修改请求消息给 eNB, 该 UE上下文修改请求消息携带 CS回落指示和 UE的标识; 具体地, MME接收 UE发送的扩展业务请求消息,根据该扩展业务请求消息携带的 CS 回落指示和 UE的标识确定出该 UE需要进行语音回落, 发送携带 CS回落指示和 UE的标 识的 UE上下文修改请求消息给 eNB。
步骤 207: eNB接收 UE上下文修改请求消息,并返回 UE上下文修改响应消息给 MME; 步骤 208 : eBN根据 UE上下文修改请求消息携带的 CS回落指示和 UE的标识, 确定 出 UE需要进行语音回落, 执行步骤 209;
步骤 209: eNB根据已存储 UE的标识和 UE已注册到 2G网络的小区的对应关系以及 UE的标识, 确定 UE是否已附着在 2G网络的小区中;
具体地, eNB根据 UE的标识, 查找 UE的标识和 UE已注册到 2G网络的小区的对应 关系, 如果查找出对应的 2G网络的小区, 则确定出 UE已附着在 2G网络的小区中。
步骤 210: eNB如果确定出 UE已附着在 2G网络的小区中, 则发送携带 CS优先回落 指示的 RRC连接释放消息, 该 CS优先回落指示用于触发 UE优先进行语音回落;
步骤 211 : UE接收 RRC连接释放消息, 根据该 RRC连接释放消息携带的 CS优先回 落指示的触发, 执行步骤 212;
进一步地,如果 UE在 LTE网络中通过与网络侧的连接进行 PS业务时检测出需要回落 到 2G网络, 则 UE接收 RRC连接释放消息后还释放与网络侧的连接。
步骤 212: UE根据存储的 2G网络的小区的上下文信息, 重定向到已注册的 2G网络的 小区中, 并在 2G网络的小区中进行相应地 CS业务;
其中, 在本实施例中, 由于 UE在开机启动后就注册在 2G网络的小区中并存储 2G网 络的小区的上下文信息, 包括小区的标识和系统消息, 所以 UE当接收 RRC连接释放消息 后, 直接根据存储的小区的标识和系统消息, 重定向到已注册的 2G网络的小区中, 而不再 需要测量小区和读取小区的系统消息, 从而减少 UE进行语音回落的时间, 并提高语音回落 的效率。
其中, 当 UE重定向到 2G网络的小区后, 在该 2G网络的小区中 UE与网络侧建立连 接, 并通过该连接进行 CS业务, 包括:
( 1 )、 如果 UE需要在 2G网络中进行位置区更新, 则 UE在已注册的 2G网络的小区 中发起位置更新流程;
( 2 )、 如果 UE需要在 2G网络中进行周期性注册, 则 UE在已注册的 2G网络的小区 中发起重新注册流程;
( 3 ): 如果 UE需要通过 CS域, 则 UE作为主叫在已注册的 2G网络的小区中通过 CS 域发起呼叫流程;
( 4): 如果 UE需要通过 CS域与主叫进行语音会话, 则 UE作为被叫在已注册的 2G 网络的小区中通过 CS域开始进行语音会话的流程。
进一步地,如果 UE在 LTE网络中通过与网络侧的连接进行 PS业务时检测出需要回落 到 2G网络, 则 UE还可以执行步骤 213。
步骤 213 : UE发送 PS业务悬挂请求消息给 SGSN( Serving GPRS ( General Packet Radio Service, 通用分组无线服务) Support Node, 服务 GPRS支撑节点), 且该 PS业务悬挂请 求消息携带 UE的标识; 本步骤为可选步骤。
步骤 214: SGSN接收该 PS业务悬挂请求消息, 根据该 PS业务悬挂请求消息携带 UE 的标识, 使 MME悬挂 UE正在进行的 PS业务, 以及触发 HSS将 MME的状态设置为悬挂 状态; 本步骤为可选步骤。
其中, 参见图 3, SGSN可以按如下的 (A) - (E ) 的流程使 MME悬挂 UE正在进行的
PS业务, 以及触发 HSS将 MME的状态设置为悬挂状态, 包括:
(A) : SGSN接收该 PS业务悬挂请求消息后, 发送悬挂触发命令消息给 MME, 且该 悬挂触发命令消息携带该 PS业务悬挂请求消息携带 UE的标识;
( B ) : MME接收该悬挂触发命令消息, 根据该悬挂触发命令消息携带 UE的标识, 将 UE正在进行的 PS业务悬挂起来;
其中, UE在进行 PS业务时, MME内会存储有 UE的标识与其对应的 PS业务, 因此, MME可以根据 UE的标识获取 UE正在进行的 PS业务。
( C ) : MME发送设置状态请求消息给 HSS,且该设置状态请求消息至少携带悬挂指示、 UE的标识和 MME的标识;
( D ) : HSS接收该设置状态请求消息, 根据该设置状态请求消息携带的悬挂指示, 设 置 MME的状态为悬挂状态, 并保存 UE的标识、 MME的标识和设置的悬挂状态的对应关 系;
( E ) : HSS返回设置状态请求响应消息给 MME。
其中, 需要说明的是: 如果 UE从 LTE网络回落到 3G网络, 则 eNB在发送 RRC连接 释放消息给 UE时, 同时发送携带 UE的标识的 PS业务悬挂请求消息给 MME, MME接收 到该 PS业务悬挂请求消息,根据该 PS业务悬挂请求消息携带 UE的标识,悬挂 UE正在进 行的 PS业务, 并发送设置状态请求消息给 HSS ; 另外, UE接收到 eNB发送的 RRC连接 释放消息后直接重定向到已注册的 3G网络的小区中,而不需要发送 PS业务悬挂请求消息。
其中, 当 SMS-GMSC ( Short Message Service Gateway MSC, 短信服务门道 MSC ) 接 收其他用户通过 PS域发送给 UE的短信时, SMS-GMSC发送携带 UE的标识的查询请求消 息给 HSS, 该查询请求消息用于向 HSS请求 UE归属的 MME地址, HSS接收到该查询请 求消息时, 根据该查询请求消息携带 UE的标识以及自身存储的 UE的标识、 MME的标识 和悬挂状态的对应关系, 检测出 UE归属的 MME的状态为悬挂状态, 且 HSS不返回 UE 归属的 MME的地址给 SMS-GMSC , 如此 SMS-GMSC就不会将该短信发送给 UE, 从而不 会对 UE正在进行 CS业务的产生影响。
其中, 如果 UE在已附着的 2G网络的小区中执行完相应地 CS业务的流程后且 MME 悬挂 UE的 PS业务, 则 UE可以重新接入到 LTE网络的小区中, 并继续进行悬挂的 PS业 务, 即 UE可以执行如下的步骤 215。
步骤 215 : 当进行完 CS业务时, UE根据存储的 LTE网络的上下文信息, 重新接入到 LTE 网络的小区中, 发送携带自身标识的 NAS (Non Access Stratum, 非接入层) 消息给 MME; 本步骤为可选步骤。
步骤 216: MME接收该 NAS消息后, 根据该 NAS消息携带的 UE的标识恢复悬挂的 PS业务并使 HSS取消为自身设置的悬挂状态; 本步骤为可选步骤。
其中,参见图 4, MME通知 HSS取消为自身设置的悬挂状态可以分为如下的(a) - ( c ) 的步骤, 包括:
(a): MME接收 UE发送的 NAS消息, 根据该 NAS消息携带的 UE的标识, 恢复悬 挂的 PS业务;
其中, MME根据该 NAS消息携带 UE的标识, 获取对应的 PS业务, 恢复获取的 PS 业务。
(b ) : MME发送取消状态请求消息给 HSS, 且该取消状态请求消息携带恢复指示、 UE 的标识和 MME的标识;
( c ) : HSS接收该取消状态请求消息, 删除 UE的标识、 MME的标识和悬挂状态的对 应关系, 并发送取消状态响应消息给 MME;
( d) : HSS发送的取消状态响应消息给 MME。
步骤 217: UE在接入的 LTE网络的小区中继续进行恢复的 PS业务。 本步骤为可选步 骤。
其中, 本实施例提供的方法也适用于 UE从 3G网络的小区回落到 2G网络的小区, 具 体回落的过程不再详细说明。
在本发明实施例中, UE即注册在 LTE网络小区中, 又注册在 2G网络的小区中, 并存 储 LTE网络的小区的上下文信息和 2G网络的小区的上下文信息, 当 UE在 LTE网络的小 区中检测出需要回落到 2G网络进行 CS业务时, UE根据 2G网络的小区的上下文信息直接 重定向到已注册的 2G网络的小区中, 从而在回落到 2G网络过程中不需要对 2G网络的小 区进行测量以及读取 2G网络的小区的系统消息, 从而减少语音回落的时间, 并提高语音回 落的效率; 另外, 由于 UE已注册在 2G网络中, 因此 MSC中已存储 UE的标识和位置信 息, 所以当 MSC接收其他用户呼叫 UE时, MSC可以根据存储的 UE的标识和位置信息, 将该呼叫直接发送给 UE, 而不需要将该呼叫先发送给 MME再由 MME发送给 UE, 因此 MME与 MSC之间不需要有接口连接, 从而减少运营成本。 本发明的另一个实施例提供了一种语音回落的方法。 其中, UE在 LTE网络中进行 PS 业务时, 如果有 CS业务需要进行,则 UE需要回落到 2G网络或 3G网络进行 CS业务; UE 从 LTE网络回落到 2G网络的流程与 UE从 LTE网络回落到 3G网络的流程基本相同,而在 本实施例中, 以 UE回落到 2G网络为例进行说明, 参见图 5, 该方法包括:
步骤 301-304: 分别与实施例 2的步骤 201-204相同, 在此不再详细说明;
步骤 305 : 如果 UE在 LTE网络的小区中检测出因为 UE发生位置区域切换或 2G网络 的注册周期超期而需要回落到 2G网络时, 则发送扩展业务请求消息给 MME, 且该扩展业 务请求消息携带会话维护指示和 UE的标识;
其中, UE发生位置区域切换时需要通过位置更新流程来切换到其他小区中来维护与 2G 网络之间的会话; UE的 2G网络的注册周期超期时需要通过重新注册流程来维护与 2G网 络之间的会话, 而位置更新流程和重新注册流程所需要的时间都较短, 因此 UE通过会话维 护指示通知网络侧此次回落到 2G网络是为了维护与 2G网络之间的会话, 占用的时间较短 且不需要切换正在进行的 PS业务。
步骤 306: MME接收该扩展业务请求消息, 发送 UE上下文修改请求消息给 eNB, 且 该 UE上下文修改请求消息携带该扩展业务请求消息携带的会话维护指示和 UE的标识; 其中, MME接收该扩展业务请求消息后根据该扩展业务请求消息携带的会话维护指示 和 UE的标识, 确定出 UE因维护与 2G网络之间的会话而需要回落到 2G网络, 然后再发 送 UE的上下文修改请求消息给 eNB。
步骤 307: eNB接收该 UE上下文修改请求消息, 并返回 UE上下文修改响应消息给 MME;
步骤 308 : eNB根据 UE上下文修改请求消息携带的会话维护指示和 UE的标识, 确定 出 UE需要进行会话维护而进行语音回落, 执行步骤 309;
步骤 309: eNB根据已存储的标识和 UE已注册到 2G网络的小区的对应关系以及 UE 的标识, 确定 UE是否已附着在 2G网络的小区中;
具体地, eNB根据 UE的标识, 查找 UE的标识和 UE已注册到 2G网络的小区的对应 关系, 如果查找出对应的 2G 网络的小区, 则判断出 UE具有双收单发的能力, 并确定出 UE已附着在 2G网络的小区中。
步骤 310: eNB如果确定出 UE已附着在 2G网络的小区中, 则发送携带 CS优先回落 指示的 RRC连接释放消息, 该 CS优先回落指示用于触发 UE优先进行语音回落;
步骤 311-317: 分别与实施例 2的步骤 211-217相同, 在此不再详细说明。
其中, 本实施例提供的方法也适用于 UE从 3G网络的小区回落到 2G网络的小区, 具 体回落的过程不再详细说明。
在本发明实施例中, UE 即注册在 LTE 网络小区中, 又注册在 2G 网络的小区中, 当 UE在 LTE网络的小区进行 PS业务的过程中检测出需要回落到 2G网络进行会话维护时, UE接收 eNB发送的 RRC连接释放消息后 UE就直接重定向到已附着的 2G网络的小区中, 且在回落到 2G网络过程中不需要测量 2G网络的小区和读取 2G网络的小区的系统消息, 从而减少语音回落的时间, 并提高语音回落的效率; 另外, 由于 UE已附着在 2G网络中, 因此 MSC中已存储 UE的标识和位置信息, 所以当 MSC接收其他用户呼叫 UE时, MSC 可以根据存储的 UE的标识和位置信息将该呼叫直接发送给 UE, 而不需要将该呼叫先发送 给 MME再由 MME发送给 UE, 因此 MME与 MSC之间不需要有接口连接, 从而减少运营 成本。 如图 6所示, 本发明的另一个实施例提供了一种语音回落的方法, 包括:
步骤 401 : UE驻留的第二无线接入网设备接收 UE发送的回落指示和 UE的标识, 该 回落指示用于请求语音回落到第一无线接入网的小区中;
步骤 402: 第二无线接入网设备根据已存储的 UE的标识和双收单发能力信息的对应关 系以及 UE的标识确定 UE已注册到第一无线接入网的小区中;
步骤 403 : 第二无线接入网设备发送 CS优先回落指示给 UE, 该 CS优先回落指示用于 触发 UE语音回落到第一无线接入网的小区中。
可选的, 该方法还包括:
第二无线接入网设备存储 UE的标识和 UE已注册到的第一无线接入网的小区的对应关 系; 和 /或,
第二无线接入网设备存储 UE的标识和 UE已注册到的第二无线接入网的小区的对应关 系。
可选的, 该方法还包括:
第二无线接入网设备接收所述 UE发送的双收单发能力信息,所述双收单发能力信息用 于指示所述 UE已注册到所述第一无线接入网的小区和 /或第二无线接入网的小区。
可选的, 该方法还包括:
第二无线接入网设备悬挂所述 UE正在进行的分组交换 PS业务。
可选的, 该方法还包括:
获知所述 UE请求恢复所述悬挂的 PS业务时, 恢复所述悬挂的 PS业务。
在本发明实施例中, 网络侧确定出 UE已注册到第一无线入网的小区后发送 CS优先回 落指示给 UE, 触发 UE优先回落到第一无线接入网的小区中, 且网络侧不要求 UE测量小 区和读取小区的系统消息,从而 UE在回落到第一无线接入网的过程中不需要测量小区以及 读取小区的系统消息, 减少语音回落的时间, 提高语音回落的效率。 如图 7所示,本发明的另一个实施例提供了一种设备,包括:处理器 501和存储器 502; 处理器 501 用于该设备驻留在第二无线接入网的小区中时, 确定该设备需要回落到第 一无线接入网, 并根据存储器 502存储的第一无线接入网的小区的上下文信息, 重定向到 第一无线接入网的小区中; 其中, 第二无线接入网的版本高于第一无线接入网的版本。
进一步地, 处理器 401, 用于该设备注册到第一无线接入网的小区时, 将第一无线接入 网的小区的上下文信息存储在存储器 502中。
进一步地, 该设备还包括收发器;
收发器用于发送双收单发能力信息给第二无线接入网设备; 和 /或, 用于发送回落指示 和该设备的标识给第二无线接入网设备, 以及接收第二无线接入网设备发送的 CS优先回落 指示;
其中, 该双收单发能力信息用于指示该设备已注册到第一无线接入网的小区和第二无 线接入网的小区; 该回落指示用于请求语音回落到第一无线接入网的小区中; 该 CS优先回 落指示用于触发该设备优先语音回落到第一无线接入网的小区中。
其中, 该收发器还用于在处理器 501 确定该设备需要回落到第一无线接入网时, 向第 二无线接入网设备请求悬挂正在进行的 PS业务。
该收发器还用于该设备在第一无线接入网的小区中的 CS业务完成后, 向第二无线接入 网设备请求恢复悬挂的 PS业务。
本实施例提供的设备可以为用户设备 UE。 此外, 该设备还可用于实现上述实施例提供 的方法中 UE执行的动作, 此处不再赘述。
在本发明实施例中, UE驻留在第二无线接入网的小区中且存储有第一无线接入网的小 区的上下文信息,当 UE在第二无线接入网的小区中确定出需要回落到第一无线接入网的小 区时, 根据第一无线接入网的小区的上下文信息重定向到第一无线接入网的小区中, 从而 在回落到第一无线接入网的过程中不需要测量小区以及读取小区的系统消息, 减少语音回 落的时间, 提高语音回落的效率。 如图 8所示, 本发明的另一个设备, 包括:
接收器 601, 用于接收 UE发送的回落指示和该 UE的标识, 该回落指示用于请求语音 回落到第一无线接入网的小区中, 该 UE驻留在所述设备控制的第二无线接入网内;
处理器 602, 用于根据该 UE的标识确定该 UE已注册到第一无线接入网的小区中; 发送器 603, 用于发送 CS优先回落指示给该 UE, 该 CS优先回落指示用于触发 UE语 音回落到第一无线接入网的小区中。
进一步地, 该设备还包括存储器;
存储器,用于存储该 UE的标识和该 UE已注册到的所述第一无线接入网的小区的对应 关系, 和 /或, 该 UE的标识和该 UE已注册到的第二无线接入网的小区的对应关系。
进一步地, 处理器 602还用于悬挂该 UE正在进行的 PS业务, 和 /或, 恢复该 UE的悬 挂的 PS业务。
本实施例提供的设备可以为网络侧设备, 例如 eNB。 此外, 该设备还可用于实现上述 实施例提供的方法中 eNB执行的动作, 此处不再赘述。
在本发明实施例中, 网络侧确定出 UE已注册到第一无线入网的小区后发送 CS优先回 落指示给 UE, 触发 UE优先回落到第一无线接入网的小区中, 且网络侧不要求 UE测量小 区和读取小区的系统消息,从而 UE在回落到第一无线接入网的过程中不需要测量小区以及 读取小区的系统消息, 减少语音回落的时间, 提高语音回落的效率。 本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完 成, 也可以通过程序来指令相关的硬件完成, 所述的程序可以存储于一种计算机可读存储 介质中, 上述提到的存储介质可以是只读存储器, 磁盘或光盘等。 以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发明的原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1、 一种语音回落的方法, 其特征在于, 所述方法包括:
如果驻留在第二无线接入网的小区中的用户设备 UE存储有第一无线接入网的小区的上 下文信息, 且确定需要回落到第一无线接入网, 则所述 UE根据所述第一无线接入网的小区 的上下文信息, 重定向到所述第一无线接入网的小区中; 其中, 所述第二无线接入网的版本 高于所述第一无线接入网的版本。
2、 如权利要求 1所述的方法, 其特征在于, 所述方法还包括:
所述 UE注册到所述第一无线接入网的小区时, 存储所述第一无线接入网的小区的上下 文信息。
3、 如权利要求 2所述的方法, 其特征在于,
如果所述 UE为电路交换 CS优先的 UE, 所述方法还包括:
所述 UE注册到所述第一无线接入网的小区之后, 驻留在所述第一无线接入网的小区中; 所述 UE进行分组交换 PS业务时, 注册到第二无线接入网的小区中, 并驻留在所述第二 无线接入网的小区中; 或者,
如果所述 UE为非 CS优先的 UE, 则所述方法还包括:
所述 UE在注册到第一无线接入网的小区时, 还注册到所述第二无线接入网的小区, 并 驻留在所述第二无线接入网的小区中。
4、 如权利要求 1-3任一项权利要求所述的方法, 其特征在于, 所述 UE确定需要回落到 第一无线接入网之前, 所述方法还包括:
所述 UE发送双收单发能力信息给第二无线接入网设备, 所述双收单发能力信息用于指 示所述 UE已注册到所述第一无线接入网的小区和第二无线接入网的小区。
5、 如权利要求 1-4任一项权利要求所述的方法, 其特征在于, 所述 UE确定需要回落到 第一无线接入网之后, 所述方法还包括:
所述 UE发送回落指示和所述 UE的标识给第二无线接入网设备, 所述回落指示用于请 求语音回落到所述第一无线接入网的小区中; 所述 UE接收所述第二无线接入网设备发送的 CS优先回落指示时, 所述 CS优先回落指 示用于触发所述 UE优先语音回落到所述第一无线接入网的小区中。
6、 如权利要求 1-5任一项权利要求所述的方法, 其特征在于, 所述 UE确定需要回落到 第一无线接入网时, 所述 UE正在所述第二无线接入网的小区中进行 PS业务, 则所述 UE重 定向到所述第一无线接入网的小区中之后, 所述方法还包括:
所述 UE请求所述第二无线接入网设备悬挂所述 PS业务。
7、 如权利要求 6所述的方法, 其特征在于, 所述方法还包括:
所述 UE在所述第一无线接入网的小区中的 CS业务完成后,请求所述网络侧恢复所述悬 挂的 PS业务。
8、 一种语音回落的方法, 其特征在于, 所述方法包括:
用户设备 UE驻留的第二无线接入网设备接收所述 UE发送的回落指示和所述 UE的标 识, 所述回落指示用于请求语音回落到第一无线接入网的小区中;
所述第二无线接入网设备根据所述 UE的标识确定所述 UE已注册到所述第一无线接入 网的小区中;
所述第二无线接入网设备发送电路交换 CS优先回落指示给所述 UE, 所述 CS优先回落 指示用于触发所述 UE语音回落到所述第一无线接入网的小区中。
9、 如权利要求 8所述的方法, 其特征在于, 还包括:
所述第二无线接入网设备存储所述 UE的标识和所述 UE已注册到的所述第一无线接入 网的小区的对应关系; 和 /或,
所述第二无线接入网设备存储所述 UE的标识和所述 UE已注册到的所述第二无线接入 网的小区的对应关系。
10、 如权利要求 9所述的方法, 其特征在于, 还包括:
所述第二无线接入网设备接收所述 UE发送的双收单发能力信息, 所述双收单发能力信 息用于指示所述 UE已注册到所述第一无线接入网的小区和 /或第二无线接入网的小区。
11、 如权利要求 8或 9或 10所述的方法, 其特征在于, 还包括:
所述第二无线接入网设备悬挂所述 UE正在进行的分组交换 PS业务。
12、 如权利要求 11所述的方法, 其特征在于, 还包括:
获知所述 UE请求恢复所述悬挂的 PS业务时, 恢复所述悬挂的 PS业务。
13、 一种设备, 其特征在于, 所述设备包括处理器和存储器;
所述处理器用于所述设备驻留在第二无线接入网的小区中时, 确定所述设备需要回落到 第一无线接入网, 并根据所述存储器存储的第一无线接入网的小区的上下文信息, 重定向到 所述第一无线接入网的小区中; 其中, 所述第二无线接入网的版本高于所述第一无线接入网 的版本。
14、 如权利要求 13所述的设备, 其特征在于,
所述处理器还用于所述设备注册到所述第一无线接入网的小区时, 将所述第一无线接入 网的小区的上下文信息存储在所述存储器中。
15、 如权利要求 13或 14所述的设备, 其特征在于, 所述设备还包括收发器; 所述收发器用于发送双收单发能力信息给所述第二无线接入网设备; 和 /或, 用于发送回 落指示和所述设备的标识给所述第二无线接入网设备, 以及接收所述第二无线接入网设备发 送的 CS优先回落指示;
其中, 所述双收单发能力信息用于指示所述设备已注册到所述第一无线接入网的小区和 第二无线接入网的小区; 所述回落指示用于请求语音回落到所述第一无线接入网的小区中; 所述 CS优先回落指示用于触发所述设备优先语音回落到所述第一无线接入网的小区中。
16、 如权利要求 13-15任一项权利要求所述的设备, 其特征在于, 所述收发器还用于在 所述处理器确定所述设备需要回落到第一无线接入网时, 向所述第二无线接入网设备请求悬 挂正在进行的 PS业务。
17、 如权利要求 16所述的设备, 其特征在于, 所述收发器还用于所述设备在所述第一无 线接入网的小区中的 CS业务完成后, 向所述第二无线接入网设备请求恢复所述悬挂的 PS业 务。
18、 一种设备, 其特征在于, 所述设备包括:
接收器, 用于接收用户设备 UE发送的回落指示和所述 UE的标识, 所述回落指示用于 请求语音回落到第一无线接入网的小区中, 所述 UE驻留在所述设备控制的第二无线接入网 内;
处理器, 用于根据所述 UE的标识确定所述 UE已注册到所述第一无线接入网的小区中; 发送器, 用于发送电路交换 CS优先回落指示给所述 UE, 所述 CS优先回落指示用于触 发所述 UE语音回落到所述第一无线接入网的小区中。
19、 如权利要求 18所述的设备, 其特征在于, 所述设备还包括存储器;
所述存储器, 用于存储所述 UE的标识和所述 UE已注册到的所述第一无线接入网的小 区的对应关系, 和 /或, 所述 UE的标识和所述 UE已注册到的所述第二无线接入网的小区的 对应关系。
20、 如权利要求 18或 19所述的设备, 其特征在于,
所述处理器还用于悬挂所述 UE正在进行的 PS业务, 和 /或, 恢复所述 UE的悬挂的 PS 业务。
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