WO2011137716A1 - 单信道语音连续性实现方法及系统 - Google Patents

单信道语音连续性实现方法及系统 Download PDF

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Publication number
WO2011137716A1
WO2011137716A1 PCT/CN2011/072893 CN2011072893W WO2011137716A1 WO 2011137716 A1 WO2011137716 A1 WO 2011137716A1 CN 2011072893 W CN2011072893 W CN 2011072893W WO 2011137716 A1 WO2011137716 A1 WO 2011137716A1
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Prior art keywords
emsc
network
mme
domain network
handover
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PCT/CN2011/072893
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English (en)
French (fr)
Inventor
陶全军
谢振华
卢飞
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中兴通讯股份有限公司
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Publication of WO2011137716A1 publication Critical patent/WO2011137716A1/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]
    • H04W36/00226Control 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] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface

Definitions

  • FIG. 1 is an architecture diagram of an evolved packet domain system (Evolved Packet System, EPS for short), including: Evolved Universal Mobile Telecommunication System Radio Access Network (E-UTRAN or E-UTRAN) EUTRAN), Mobility Management Entity (MME), Serving Gateway (S-GW); Packet Data Network Gateway (PDN GW or P-GW) The GPRS Supporting Node (SGSN), the Policy and Charging Rule Function (PCRF), and the Home Subscriber Server (HSS) .
  • E-UTRAN or E-UTRAN EUTRAN
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • PDN GW or P-GW Packet Data Network Gateway
  • the GPRS Supporting Node (SGSN), the Policy and Charging Rule Function (PCRF), and the Home Subscriber Server (HSS) Among them, the P-GW and the S-GW may be combined in one physical entity.
  • SGSN GPRS Supporting Node
  • PCRF Policy and Charging Rule Function
  • HSS Home Subscriber Server
  • the GSM EDGE radio access network GERAN
  • CS 3G/2G Circuit Switch
  • E-UTRAN is mainly used for Packet Switch (referred to as PS) domain network access
  • PS Packet Switch
  • Source MSC Source Mobile Switch Center
  • eMSC enhanced mobile switch center
  • the NE can be deployed as the same network element as the Source MSC. .
  • IP Multimedia Core Network Subsystem is a related network element in the IMS service system.
  • the control layer and the service layer are separated, and the control layer does not provide specific services.
  • the service layer provides the necessary functions of triggering, routing, and accounting.
  • the service triggering and control functions in the control layer are implemented by the Call Session Control Function (CSCF).
  • Call session control functions are divided into: Proxy call session control function (Proxy-CSCF, referred to as P-CSCF), query call session control function (Interrogating-CSCF, referred to as I-CSCF for short) and service call session control function (Serving-CSCF, S-CSCF for short).
  • the service layer is composed of a series of application servers (Application Servers, AS for short), which can provide specific service services.
  • the AS can be an independent entity or exist in the S-CSCF.
  • 3 is a flow chart of the related art in which single channel voice service continuity is switched from a CS domain to a PS domain (which may be referred to as reverse handover), and describes that the SR UE first establishes a session with the remote end in the circuit switched domain network, signaling and The service is anchored in the IMS network, and the SR UE subsequently has single-channel voice continuity.
  • the SR UE accesses from the Long-Term Evolution (LTE) network, re-establishes the connection with the remote media, and maintains the continuous session.
  • LTE Long-Term Evolution
  • the method includes the following steps: 301.
  • the GERAN/UTRAN network decides to initiate handover to the E-UTRAN according to the wireless measurement 4 of the SR UE.
  • the GERAN/UTRAN sends a handover request message (HO Required) to the source MSC, where the message carries a target cell identifier that points to the target E-UTRAN network.
  • HO Required handover request message
  • the source MSC sends a handover preparation message (Prepare HO Request) to the eMSC according to the target cell identifier in the message, and notifies the target network to perform handover.
  • a handover preparation message Prepare HO Request
  • the eMSC determines that the SR UE does not have network resources in the target E-UTRAN network, and determines whether the network resource is available.
  • the eMSC can query the target network MME or query the device.
  • the eMSC returns a handover preparation response message (Preparation HO Response) to the source MSC, where the message carries a Networl Access Indicator (NAI), and the indication is used to notify the SR UE to access the newly created network resource on the E-UTRAN network.
  • Preparation HO Response a handover preparation response message
  • NAI Networl Access Indicator
  • the Source MSC returns a handover response message (HO Response) to the source GERAN/UTRAN network, where the message carries a network access indication.
  • HO Response handover response message
  • the source GERAN/UTRAN sends a handover command (HO Command) to notify the SR UE to perform handover.
  • the message carries a network access indication, indicating that the UE accesses the E-UTRAN network, and the new network resource completes the handover;
  • the SR UE receives the handover command, switches to the E-UTRAN network according to the network access indication, and initiates a Tracking Area Update (TAU). Since the SR UE switches to the E-UTRAN network, from this point on, the user plane connection between the SR UE and the GERAN/UTRAN is broken, and the voice between the SR UE and the remote end is temporarily unable to communicate;
  • TAU Tracking Area Update
  • the SR UE establishes a required load on the E-UTRAN network, and the establishment process is a standard PS bearer establishment process, which is not described in detail herein;
  • the SR UE registers with the home IMS network of the user;
  • the registration is successful, and the SR UE sends a session invitation message (INVITE) to the home IMS network, and the message carries a session transfer indication statically configured in the UE (Session Transfer)
  • STI Service Continuity
  • the IMS network element updates the remote process, so that the original IP media connection is directly connected to the Source MSC and is directly connected to the SR UE.
  • SC Service Continuity
  • some EPS NEs and other network devices may be used. This step is a standard SC process and is not detailed here;
  • the IMS network element After the remote update succeeds, the IMS network element returns a success message (200 OK) to the SR UE. After receiving the 200 Ok message, the SR UE resumes voice communication with the remote end, and completes the SR UE to switch voice continuity between CS and PS.
  • the GERAN/UTRAN also needs to notify the SGSN to perform handover, and the SGSN receives the notification, and will send a PS to PS handover to the MME.
  • a primary object of the present invention is to provide a method and system for implementing single channel voice continuity to solve at least one of the above problems. According to an aspect of the present invention, a method for implementing single channel voice continuity is provided, including:
  • the UTRAN or the GERAN informs the eMSC to prepare to switch the UE from the CS domain network to the PS domain network; the eMSC determines that the UE has both the CS voice service and the PS data service, and notifies the MME UE of the PS domain network that both the CS voice service and the PS data service exist; Notifying the network of the PS domain network after receiving the CS to PS handover request message and the PS to PS handover request message of the UE
  • the MME prepares the network resource for the UE; the MME notifies the UE to switch to the PS domain network through the CS domain network; after the UE switches to the PS domain network, the network resource prepared by the PS domain network for the UE transmits the media data between the UE and the remote end.
  • the UTRAN or the GERAN notifies the eMSC to prepare to switch the UE from the CS domain network to the PS domain network.
  • the UTRAN or the GERAN determines whether the UE has both the CS voice service and the PS data service, and sends a notification to the eMSC to notify the UE to be configured by the CS domain network.
  • the notification carries the service indication information indicating whether the UE has both the CS voice service and the PS data service
  • the eMSC determines that the UE has both the CS voice service and the PS data service, and the eMSC parses the service from the notification.
  • the indication information determines, according to the indication of the service indication information, that the UE has both the CS voice service and the PS data service.
  • the method further includes: the serving GPRS support node SGSN of the CS domain network sends a notification message to the eMSC, the notification message is used to notify the eMSC UE whether to initiate the PS data service; and the eMSC determines that the UE has both the CS voice service and the PS data service: eMSC
  • the parsing notification message is that the UE is initiating the PS data service, and determines that the UE has both the CS voice service and the PS data service.
  • the sending, by the SGSN, the notification message to the eMSC includes: when the UE initiates or ends at the SGSN.
  • the SGSN sends a notification message to the eMSC.
  • the eMSC notifies the MME that the CS voice service and the PS data service exist at the same time.
  • the eMSC sends a CS to PS handover request message to the MME.
  • the CS to PS handover request message carries the PS service indicating that the UE has both the CS voice service and the PS data service. Instructions.
  • the MME notifying the UE to switch to the PS i or the network through the CS i or the network includes: the MME sends a CS to PS handover response message to the eMSC; the eMSC sends a handover preparation response message to the UTRAN or the GERAN; the UTRAN or the GERAN receives the handover preparation response message And after the handover response message of the PS to PS handover request message, the UE sends a handover command to the UE to notify the UE to switch to the PS domain network.
  • the PS to PS handover request message carries the context information of the UE, and the context information includes the default information of the UE.
  • the notification that the PS i or the network element of the network prepares the network resource for the UE includes: Step 1: The MME acquires the UE. User information, the service gateway entity S-GW of the PS domain network is selected according to the user information; Step 2, the MME sends a create session request message to the S-GW, requesting to create a default bearer of the UE; Step 3, S-GW is The default bearer allocates a bearer resource, and returns a create session request response message to the MME, where the create session request response message carries the IP address of the UE. The MME sends a handover request message to the evolved UTRAN to notify the evolved UTRAN to allocate the default air interface resource.
  • Step 5 Receive the handover response message returned by the evolved UTRAN, where the handover response message carries Access parameters for air interface resources.
  • the MME obtains the user information of the UE, including the following: The MME obtains the user information of the locally saved UE; the MME parses the user information of the UE from the PS to the PS handover request message; and the MME sends the UE to the home network server according to the identifier of the UE. Obtain user information of the UE.
  • the CS to the PS handover response message, the handover preparation response message, and the handover command carry the access parameter of the air interface resource.
  • the method further includes: the UE accessing the PS according to the access parameter of the air interface resource. Domain network.
  • the handover response message and the CS to PS handover response message carry the UE assignment
  • the eMSC Before the eMSC sends the handover preparation response message to the UTRAN/GERAN, the eMSC allocates an IP address and a port number of the eMSC for the media connection. The UE or the eMSC establishes the UE and the eMSC by using the default bearer according to the IP address of the peer end. Media connection between the media data transmitted between the UE and the remote end by the network resource allocated for the UE includes: transmitting media data between the UE and the remote end through the media connection. The eMSC is connected to the UTRAN or the GERAN by the source MSC.
  • a single channel voice continuity implementation system including:
  • the UTRAN or GERAN configured to notify the eMSC to prepare to handover the UE from the CS domain network to the PS domain network; the eMSC is configured to determine whether the UE has both the CS voice service and the PS data service, and if so, notify the MME of the PS domain network The UE has both the CS voice service and the PS data service; the MME is configured to receive the CS to PS handover request message of the UE and the UE after receiving the notification that the eMSC indicates that the UE has both the CS voice service and the PS data service.
  • the network element of the PS domain network is notified to prepare network resources for the UE, so that after the UE switches to the PS domain network, the network resource prepared by the PS domain network for the UE is transmitted between the UE and the remote end.
  • the media data, and the MME is further configured to notify the UE to switch to the PS domain network through the CS domain network.
  • the UTRAN/GERAN sends a notification to the eMSC when it is ready to initiate the CS domain to the PS domain handover of the single channel UE. After receiving the notification, the eMSC determines whether the UE has both the CS voice service and the PS data service.
  • the MME of the target network is notified, and after receiving the notification of the eMSC, the MME of the target network receives the CS to PS (CS to PS) handover request message and the PS to PS (PS to PS) handover request of the UE.
  • the UE prepares network resources, which can reduce the voice interruption time during the handover process and further improve the user experience.
  • FIG. 1 is a schematic diagram of an EPS system architecture in the related art
  • FIG. 2 is a single-mode service continuity architecture diagram in the related art
  • FIG. 3 is a related art single-mode voice service continuity switching packet switching from a circuit switched domain
  • FIG. 4 is a schematic structural diagram of a single channel voice continuity implementation system according to Embodiment 1 of the present invention
  • FIG. 5 is a schematic structural diagram of another single channel voice continuity implementation system according to Embodiment 1 of the present invention
  • 6 is a flowchart of a method for implementing single-channel voice continuity according to Embodiment 1 of the present invention
  • FIG. 7 is a signaling flowchart according to Embodiment 2 of the present invention
  • FIG. 8 is a signaling flowchart according to Embodiment 3 of the present invention.
  • FIG. 4 is a schematic structural diagram of a system for implementing a single-channel voice continuity according to Embodiment 1 of the present invention, including: MME 30 of UTRAN/GERAN 10, eMSC 20, and a target network (ie, a PS domain network).
  • MME 30 of UTRAN/GERAN 10 UTRAN/GERAN 10
  • eMSC 20 eMSC 20
  • target network ie, a PS domain network
  • the UTRAN/GERAN 10 is configured to notify the eMSC 20 to prepare to switch the UE from the CS domain network to the PS domain network (ie, the target network); the eMSC 20 is configured to determine whether the UE has both the CS voice service and the PS data service, if And notifying the MME 30 that the UE has both the CS voice service and the PS data service; the MME 30 is configured to receive the CS to the UE after receiving the notification that the eMSC 20 indicates that the UE has both the CS voice service and the PS data service.
  • the network element of the PS domain network is notified to prepare network resources for the UE, so that after the UE switches to the PS domain network, the network resource prepared by the PS domain network is prepared.
  • the media data between the UE and the remote end, and the MME 30 is further configured to notify the UE to switch to the PS domain network through the CS domain network (ie, the source network).
  • the handover of the SR UE from the CS domain to the PS domain is performed in the related art, if the SR UE currently has PS i or service, the CS to PS handover of the SR UE and the PS to PS handover are independent of each other, thereby The handover of the CS domain service and the PS domain service of the SR UE is not synchronized.
  • the MSCRAN/GERAN 10 when the UTRAN/GERAN 10 is ready to initiate the handover of the CS domain to the PS domain of the single channel UE, the MSCRAN/GERAN 10 sends a notification to the eMSC 20, and after receiving the notification, the eMSC 20 determines whether the UE exists at the same time.
  • the CS voice service and the PS data service if yes, notify the MME 30 of the target network that the MME 30 of the target network receives the CS to PS handover request message and the PS to PS handover request of the UE after receiving the notification of the eMSC.
  • the network element of the target network is notified to prepare network resources for the UE, and then the UE is notified to switch to the target network, so that the CS voice service and the PS data service of the UE can be synchronously switched, and, since the target network is before the UE switches to the target network, Network resources are prepared for the UE, so that the voice interruption time during the handover process can be reduced.
  • the source MSC does not have the enhanced capability
  • the UTRAN/GERAN 10 communicates with the eMSC 20 through the source MSC. Therefore, the system further includes the source MSC, and FIG. 5 is another single channel of the embodiment.
  • the system architecture of the voice continuity is implemented.
  • the system further includes: a source MSC 40, which is accessed by the E-UTRAN, and a network element such as an S-GW/P-GW and a PCRF in the target network (ie, the PS i or the network). .
  • the UTRAN/GERAN 10 may also determine whether the UE has both the CS voice service and the PS data service, and notify the eMSC 20 to prepare the UE.
  • the result of the determination is notified to the eMSC 20.
  • the eMSC 20 can determine whether the UE has both the CS voice service and the PS data service according to the judgment result.
  • the eMSC 20 may also determine, according to the notification of the SGSN, whether the UE has both the CS voice service and the PS data service.
  • the SGSN may notify the UE to register the registered eMSC 20 when the SGSN is registered. Whether the current UE is initiating a data service, the eMSC 20 can determine whether the UE has both the CS voice service and the PS data service according to the notification of the SGSN.
  • Step 4 STU 4: Step 4: Step S602: Step S602, UTRAN/GERAN notifies the eMSC to prepare to UE
  • the source MSC is an enhanced MSC (ie, eMSC)
  • the UTRAN/GERAN decides to initiate an inter-network access handover according to the radio measurement report reported by the UE, and sends a handover request message notification to the eMSC.
  • the eMSC prepares to switch the UE to the PS domain network; if the source MSC is a non-enhanced MSC, the UTRAN/GERAN decides to initiate an inter-network access handover according to the radio measurement report reported by the UE, and sends a handover request message to the source MSC, and the source MSC switches.
  • the target cell information to be carried is requested, and a handover preparation message is sent to the eMSC to notify the eMSC to prepare to handover the UE to the PS domain network.
  • Step S604 the eMSC determines that the UE has both the CS voice service and the PS data service, and notifies the MME of the PS domain network that the UE has both the CS voice service and the PS data service; for example, when the UTRAN/GERAN is ready to switch the UE to the PS i or the network.
  • the UTRAN/GERAN may determine whether the UE has both the CS voice service and the PS data service.
  • the UE may notify the eMSC of the determination result.
  • the UTRAN/GERAN may be used to indicate whether the UE is The service indication identifier of the CS voice service and the PS data service is carried in the foregoing handover request message and sent to the eMSC.
  • the eMSC can determine whether the UE has both the CS voice service and the PS data service according to the indication of the service indication identifier.
  • the SGSN may send a notification to the eMSC that the UE jointly registers when registering with the SGSN, and the eMSC may determine, according to the notification, whether the UE has both the CS voice service and the PS data service.
  • the eMSC may notify the MME whether the CS voice service and the PS data service exist at the same time by carrying the service indication identifier in the CS to PS handover request message sent to the MME.
  • the UE may occupy one bit to indicate, if the bit If the value of the bit is 1, it indicates that the UE has both the CS voice service and the PS data service.
  • the eMSC can send a dedicated notification message to the MME, and the notification message is used to indicate whether the MME has the CS voice service and the UE simultaneously. PS data service.
  • Step S606 After receiving the CS to PS handover request message to the UE and the PS to PS handover request message of the UE, the MME notifies the network element of the PS domain network to prepare network resources for the UE; because the UE has both CS voice service and PS data
  • the MME receives the CS to PS handover request message of the UE and the PS to PS handover request message of the UE, the MME notifies the network element of the PS domain network to prepare network resources for the UE. If the eMSC notifies the UE that there is no PS data service, the MME notifies the network element of the PS domain network to prepare the network resource for the UE after receiving the CS to PS handover request.
  • the MME may notify the network element of the PS domain network to prepare network resources for the UE according to the following steps: Step 1: The MME acquires user information of the UE, and selects a PS domain network according to the user information.
  • the S-GW can obtain the user information of the UE according to the following manners: (1) The MME obtains the locally saved user information of the UE; (2) The MME parses the user information of the UE from the PS to PS handover request message. That is, the user information of the UE is parsed from the context information of the UE; (3) The MME acquires the user information of the UE from the home network server of the UE according to the identifier of the UE. Step 2: The MME sends a create session request message to the S-GW, requesting to create a default bearer of the UE.
  • the POS-to-PS handover request message received by the MME carries the context information of the UE, where the context information includes An identifier of the default bearer of the UE;
  • Step 3 The S-GW allocates a bearer resource to the default bearer, and returns a create session request response message to the MME, where the create session request response message carries the UE.
  • the MME sends a handover request message to the evolved UTRAN, and notifies the evolved UTRAN to allocate the air interface resource of the default bearer;
  • Step 5 The MME receives a handover response message returned by the evolved UTRAN, where the handover response message carries an access parameter of the air interface resource.
  • the MME informs the UE to switch to the PS domain network through the CS domain network.
  • the MME may send a CS to PS handover response message to the eMSC, where the message may carry the access parameter of the air interface resource allocated by the target network, and the eMSC receives the
  • the handover preparation response message may be returned to the source MSC or the direct UTRAN/GERAN, where the handover preparation response message carries the access parameter of the air interface resource, and finally the UTRAN/GERAN sends a handover command message to the UE, where the handover command is sent.
  • the message carries the access parameter of the air interface resource, and notifies the UE to switch to the target network.
  • Step S610 After the UE switches to the PS domain network, the foregoing network resource prepared by the PS domain network for the UE transmits media data between the UE and the remote end. For example, a temporary media connection may be established between the UE and the eMSC. After the UE switches to the PS domain network, the media data between the UE and the remote end may be transmitted through the media connection before the IMS remote media update succeeds. For example, the media connection may be initiated by the UE or may be initiated by the eMSC. This can reduce the interruption of the call between the UE and the remote end.
  • step 307 is performed, which is different from the process shown in FIG. 3 in that the implementation is In the example, since the target network has established a default load for the UE, step 309 is not required to be performed. Thereby, the communication interruption time between the UE and the remote end can be reduced.
  • the eMSC notifies the MME whether the UE has both the PS data service and the CS voice service when the MME of the target network is ready to switch the UE to the PS i or the network, and if so, After receiving the CS to PS handover request message and the PS to CS handover request message of the UE, the MME requests the network element of the target network to allocate network resources to the UE, and notifies the UE to switch to the PS domain after the network resource allocation succeeds. Thereby, the CS voice service of the UE and the PS data service can be synchronously switched.
  • the second embodiment describes the process of switching to the PS domain network when the SR UE simultaneously generates the circuit domain voice service and the PS domain data service in the GERAN/UTRAN network.
  • Figure 7 is the letter of the embodiment In the flowchart, the GERAN/UTRAN determines to initiate the access network handover according to the measurement report reported by the SR UE, and sends a handover request message to the source MSC, which mainly includes the following steps:
  • the GERAN/UTRAN determines to initiate an inter-network access handover according to the radio measurement report reported by the SR UE. 702.
  • the GERAN/UTRAN senses that the SU UE simultaneously initiates the CS voice service and the PS data service in the network, and sends a handover request message to the source MSC.
  • the target address location cell in the message is the target PS domain network cell, and the message further carries a PS service indication identifier, where the PS service indication identifier is used to indicate that the UE initiates the CS voice service and the PS data service simultaneously on the source network. ;
  • the GERAN/UTRAN sends a handover request message to the SGSN at the same time. 704.
  • the source MSC selects the eMSC according to the target cell information, and sends a handover preparation message to the eMSC, where the message carries the source cell and the target cell information, and the PS service. Instructing the identifier and the user identity (eg, IMSI), if the source MSC determines that the SGSN address of the UE currently camped in the device, the SGSN address is also carried in the message;
  • the eMSC receives the handover preparation message, and selects the MME according to the target cell, and sends a CS to PS handover request message to the MME, where the message carries the source cell and the target cell information,
  • the PS service indication identifier and the user identity e.g., IMSI
  • the received handover preparation message carries the SGSN address
  • the SGSN sends a PS to PS handover request message to the MME, where the message carries the context information of the UE, where the context information includes the identifier of the default bearer of the UE.
  • the MME determines whether the received PS to PS handover request message carries the PS service indication identifier, and if yes, the MME selects the S-GW/ after receiving the PS to PS handover request message of step 4
  • the P-GW requesting the S-GW/P-GW to create a default 7-load indicated by the identifier in the context information in step 706;
  • the target EUTRAN is selected according to the target cell information, and a handover request message is sent to the target EUTRAN, and the EUTRAN is notified to allocate the air interface resource, and the message carries
  • the default S-GW user plane created by 707-708 is connected to the connection address of EUTRAN.
  • EUTRAN After the allocation of the air interface resource is completed, the media connection between the EUTRAN and the S-GW is established, and the handover response message is returned to the MME, where the message carries the allocated air interface resource access parameter;
  • the MME returns a CS to PS handover response message to the eMSC, where the message carries the EUTRAN air interface resource access parameter and the IP address of the UE; 711. At the same time, the MME returns a PS to PS handover response message to the SGSN, where the message carries
  • the SGSN returns a handover response message to the GERAN/UTRAN;
  • the eMSC After receiving the CS to PS handover response message, the eMSC allocates a user plane IP address and a port number for the media connection between the eMSC and the SR UE, and generates a voice flow flow template according to the received UE IP address.
  • the template is used to indicate that the UE and the eMSC establish a media connection between the SR UE and the eMSC, and receive/send the voice media through the voice TFT.
  • the voice TFT includes the IP address and port number of the UE side and the eMSC side, and the UE side The port sets the default value specified by the network;
  • the eMSC returns a handover preparation response message to the Source MSC, where the message carries the TFT generated by step 713, the user establishes the handover number of the CS bearer, and the EUTRAN air interface access parameter;
  • the source MSC receives the handover preparation response message, and establishes a CS between the Source MSC and the eMSC according to the handover number.
  • the source MSC returns a handover response message to the GERAN/UTRAN, where the message carries the EUTRAN open access parameter and the TFT; 717.
  • the GERAN/UTRAN receives the handover response message from the SGSN and the source MSC, and notifies the SR by switching the command message.
  • the UE performs handover, and the message carries the EUTRAN air interface access parameter and the TFT;
  • the SR UE switches to the EUTRAN network according to the EUTRAN air interface access parameter
  • the SR UE sends a handover complete message to the EUTRAN network; 720.
  • the EUTRAN receives the handover complete message, and notifies the MME by using a handover notification message;
  • the MME returns a handover complete message to the eMSC, and the eMSC notifies the Source MSC; 722.
  • the Source MSC receives the handover complete message of the target network, whether the GERAN/UTRAN network resource and the air interface resource;
  • the MME notifies the P-GW to update the previously created default bearer to the new S-GW through the S-GW; 727.
  • the eMSC and the SR UE establish a media connection between the two; the media connection between the two comprises two parts .
  • the first part is connected between the eMSC and the P-GW as an IP data bearer.
  • the connection complies with the SGi port standard protocol.
  • the other part is the P-GW and the SR UE see the media connection.
  • the connection is an EPS bearer and complies with the EPS network related protocol.
  • the IP data bearer between the eMSC and the P-GW does not need to be established separately. Only the destination IP and the source IP can be transmitted to each other during the transmission.
  • the eMSC and the SR UE establish the direct media connection between the two, and need to establish the SR UE and the P-GW.
  • the media connection can be created by the UE or eMSC using the default bearer reserved during the handover preparation process.
  • the eMSC 4 receives the circuit domain voice data packet of the Source MSC and converts it into an IP voice data packet, and sends it to the SR UE according to the TFT connection between the two.
  • the IP voice data packet from the SR UE is converted to a circuit domain voice packet and forwarded to the Source MSC.
  • the SR UE receives and sends an IP voice data packet according to the voice TFT;
  • the SR UE performs IMS registration with the IMS of the user home; 730. After the registration is completed, the SR UE sends a session invitation message to the IMS network element to notify the IMS to perform remote update, and the message carries SR UE media IP address and newly assigned port number and session transfer identification (Session Transfer Identification)## After the IMS receives the session invitation message, the remote media connection is updated;
  • a completion message is returned, where the message carries the IP address and port number of the remote media, and the remote voice data packet is sent to the source UE to the SR UE, and the UE receives the completion message.
  • the termination is sent to the eMSC, and the packet is sent to the remote media IP and port.
  • FIG. 8 is a signaling flow of the embodiment, which mainly includes the following steps:
  • the SR UE registers in the PS domain, and is registered by the SGSN to the MSC through joint registration; the 802.SR UE initiates a data service request;
  • the SGSN informs the MSC that the current SR UE initiates the data service by using a notification message
  • the SR UE performs data interaction with the remote IP network
  • the SR UE initiates a release data service request
  • the SGSN informs the MSC that the current SR UE has cancelled the data service by using a notification message; 807.
  • the PS network releases the PS connection of the UE.
  • the MSC can be notified by the jointly registered SGSN: whether the SR UE is initiating the PS data service, so that the MSC can determine whether the SR UE has both the CS voice service and the PS data service.
  • the UTRAN/GERAN when the UTRAN/GERAN is ready to initiate the handover of the CS domain to the PS domain of the single channel UE, the UTRAN/GERAN sends a notification to the eMSC, and after receiving the notification, the eMSC determines the Whether the UE has both the CS voice service and the PS data service, and if so, notifies the MME of the target network that the MME of the target network receives the CS to PS (CS to PS) handover request of the UE after receiving the notification of the eMSC.
  • the network element of the target network is notified to prepare the network resource for the UE, and then the UE is notified to switch to the target network, so that the CS voice service and the PS data service of the UE can be switched synchronously.
  • the target network prepares network resources for the UE before the UE switches to the target network, the voice interruption time during the handover process can be reduced, and the user body risk is further improved.
  • the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

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Description

单信道语音连续性实现方法及系统 技术领域 本发明涉及通信领域, 具体而言, 涉及一种单信道语音连续性实现方法 及系统。 背景技术 图 1为演进的分组域系统( Evolved Packet System, 简称为 EPS )的架构 图, 包括: 演进的全球移动通信系统无线接入网 ( Evolved Universal Mobile Telecommunication System Radio Access Network , 简称 E-UTRAN 或 EUTRAN ), 移动管理实体( Mobility Management Entity, 简称为 MME ), 务网关实体 ( Serving Gateway, 简称为 S-GW ); 分组数据网网关( Packet Data Network Gateway,简称为 PDN GW或 P-GW ),月艮务 GPRS支持节点( Serving GPRS Supporting Node, 简称为 SGSN )、 计费和策略控制实体 (Policy and Charging Rule Function,简称为 PCRF )以及归属网络月艮务器( Home Subscriber Server, 简称为 HSS )。 其中, P-GW和 S-GW可能合设在一个物理实体中。 图 2为相关技术中单信道语音连续性( Single Radio Voice Call Continuity, 简称为 SRVCC )系统架构图。 其中, UTRAN/GSM EDGE无线接入网( GSM EDGE radio access network, 简称为 GERAN ) 主要用于为 3G/2G电路交换 ( Circuit Switch, 简称为 CS ) i或网络接入; E-UTRAN 主要用于分组交换 ( Packet Switch , 简称为 PS ) 域网络接入; 源移动交换中心 ( Source Mobile Switch Center, 简称为 Source MSC )主要用于用户在源电路交换网络用户面 和信令交换功能; 增强移动交换中心 ( enhanced Mobile Switch Center, 简称 为 eMSC ), 用于帮助单信道 ( Single Radio, 简称为 SR ) UE完成 CS域和 PS域间语音连续性, 该网元可以与 Source MSC部署为同一个网元。
IP多媒体子系统 ( IP Multimedia Core Network Subsystem, 简称为 IMS ) 网元是 IMS业务体系中的相关网元, 在 IMS业务体系中, 控制层和业务层 是分离的, 控制层不提供具体业务, 只向业务层提供必要的触发、 路由、 计 费等功能, 控制层中业务触发和控制功能是呼叫会话控制功能 (Call Session Control Function, 简称为 CSCF ) 完成的。 呼叫会话控制功能分为: 代理呼 叫会话控制功能 (Proxy-CSCF, 简称为 P-CSCF )、 查询呼叫会话控制功能 ( Interrogating-CSCF , 简称为 I-CSCF ) 和服务呼叫会话控制功能 ( Serving-CSCF, 简称为 S-CSCF ) 三种类型。 而业务层是由一系列应用月艮 务器 (Application Server, 简称为 AS ) 组成, 能提供具体业务服务, AS可 以是独立的实体, 也可以存在于 S-CSCF中。 图 3是相关技术中单信道语音业务连续性从 CS域切换到 PS域(可以称 为反向切换)的流程图,描述了 SR UE先在电路交换域网络与远端建立会话, 信令和业务锚定在 IMS网络, SR UE后续发生单信道语音连续性, SR UE从 长期演进(Long-Term Evolution, 简称为 LTE ) 网络接入, 重新建立与远端 媒体连接, 保持会话连续的过程, 包括如下步骤: 301、 GERAN/UTRAN网络才艮据 SR UE上 4艮的无线测量 4艮告, 决定发起 向 E-UTRAN切换;
302、 GERAN/UTRAN向 Source MSC发送切换请求消息( HO Required ), 消息中携带指向目标 E-UTRAN网络的目标小区标识;
303、 Source MSC根据消息中目标小区标识向 eMSC发送切换准备消息 ( Prepare HO Request ), 通知目标网络进行切换;
304、 eMSC判断 SR UE在目标 E-UTRAN网络中不存在网络资源, 判 断是否具备网络资源, eMSC可以向目标网络 MME查询, 或者在设备内部 查询;
305、 eMSC 向 Source MSC 返回切换准备响应消息 ( Prepare HO Response ), 消息中携带网络接入指示 ( Networl Access Indicator, NAI ), 通 过该指示通知 SR UE在 E-UTRAN网络接入新建网络资源, 以完成切换;
306、 Source MSC 向源 GERAN/UTRAN 网络返回切换应答消息 ( HO Response ) , 消息中携带网络接入指示;
307、 源 GERAN/UTRAN发送切换命令 ( HO Command )通知 SR UE进 行切换。 消息中携带网络接入指示, 指示 UE接入到 E-UTRAN网络, 并新 建网络资源完成切换;
308、 SR UE收到切换命令,根据网络接入指示,切换到 E-UTRAN网络, 并发起标准艮踪区域更新流程 ( Tracking Area Update , 简称为 TAU ); 由于 SR UE 切换到 E-UTRAN 网络, 因此, 从此时开始, SR UE 与 GERAN/UTRAN之间用户面连接发生断裂, SR UE与远端间的语音暂时无 法通讯;
309、 SR UE在 E-UTRAN网络建立所需 载, 建立过程是标准 PS 载 建立过程, 这里不作详细描述;
310、 承载建立完毕后, SR UE向用户归属地 IMS网络进行注册;
311、 注册成功, SR UE 向用户归属地 IMS 网络发送会话邀请消息 ( INVITE ), 消息携带静态配置在 UE内部的会话转移指示( Session Transfer
Indication, 简称为 STI ), 指示 IMS 网元本次会话用于业务连续性 (Service Continuity, 简称为 SC )。 IMS 网元通过更新远端流程, 使原先 IP媒体连接 由远端连接到 Source MSC更新到与 SR UE直接相连,中间可能途径一些 EPS 网元和其他网络设备。 该步骤是标准的 SC流程, 这里不详述;
312、 远端更新成功后, IMS网元向 SR UE返回成功消息 (200 OK )。 SR UE收到 200 Ok消息后, 恢复与远端之间的语音通讯, 完成 SR UE在 CS 和 PS之间切换语音连续性。 发明人发现, 在上述单信道语音业务连续性实现方法中, 如果 SR UE当 前还有 PS域业务, 则 GERAN/UTRAN还需要通知 SGSN进行切换, SGSN 接收到通知, 将向 MME发送 PS to PS切换请求, MME在接收到该切换请 求后, 执行 PS到 PS的切换, 由于 SR UE的 CS到 PS的切换和 PS到 PS的 切换相互独立, 从而将导致 SR UE的 CS域业务和 PS域业务的切换不同步, 降低了用户的体验。 发明内容 本发明的主要目的在于提供一种单信道语音连续性实现方法及系统, 以 至少解决上述问题之一。 才艮据本发明的一个方面,提供了一种单信道语音连续性实现方法, 包括:
UTRAN或 GERAN通知 eMSC准备将 UE由 CS域网络切换到 PS域网络; eMSC确定该 UE同时存在 CS语音业务和 PS数据业务, 通知 PS域网络的 MME UE同时存在 CS语音业务和 PS数据业务; MME在接收到该 UE的 CS到 PS切换请求消息以及 PS到 PS切换请求消息后, 通知 PS域网络的网 元为该 UE准备网络资源; MME通过 CS域网络通知 UE切换到 PS域网络; UE切换到 PS域网络后, 通过 PS域网络为 UE准备的网络资源传输 UE与 远端之间的媒体数据。 其中, UTRAN或 GERAN通知 eMSC准备将 UE由 CS域网络切换到 PS域网络包括: UTRAN或 GERAN判断 UE是否同时存在 CS语音业务和 PS数据业务, 向 eMSC发送通知, 通知准备将 UE由 CS域网络切换到 PS 域网络, 其中, 通知中携带有指示 UE是否同时存在 CS语音业务和 PS数据 业务的业务指示信息; eMSC确定 UE同时存在 CS语音业务和 PS数据业务 包括: eMSC从通知中解析出业务指示信息, 根据业务指示信息的指示, 确 定 UE同时存在 CS语音业务和 PS数据业务。 其中, 该方法还包括: CS域网络的服务 GPRS支持节点 SGSN向 eMSC 发送通知消息,通知消息用于通知 eMSCUE是否正发起 PS数据业务; eMSC 确定 UE同时存在 CS语音业务和 PS数据业务包括: eMSC解析通知消息获 知 UE正发起 PS数据业务, 确定 UE同时存在 CS语音业务和 PS数据业务。 其中, SGSN向 eMSC发送通知消息包括: 当 UE在 SGSN发起或结束
PS数据业务时, SGSN向 eMSC发送通知消息。 其中, eMSC通知 MMEUE同时存在 CS语音业务和 PS数据业务包括: eMSC向 MME发送 CS到 PS切换请求消息, CS到 PS切换请求消息中携带 有指示 UE同时存在 CS语音业务和 PS数据业务的 PS业务指示。 其中, MME通过 CS i或网络通知 UE切换到 PS i或网络包括: MME向 eMSC发送 CS到 PS切换应答消息; eMSC向 UTRAN或 GERAN发送切换 准备应答消息; UTRAN或 GERAN在接收到切换准备应答消息以及 PS 到 PS切换请求消息的切换应答消息之后, 向 UE发送切换命令, 通知 UE切换 到 PS域网络。 其中, PS到 PS切换请求消息中携带有 UE的上下文信息, 上下文信息 中包含 UE的缺省 载的信息; ΜΜΕ通知 PS i或网络的网元为 UE准备网络 资源包括: 步骤 1 , MME获取 UE的用户信息, 才艮据用户信息选择 PS域网 络的服务网关实体 S-GW; 步骤 2 , MME向 S-GW发送创建会话请求消息, 请求创建 UE的缺省承载;步骤 3 , S-GW为缺省承载分配承载资源,向 MME 返回创建会话请求应答消息, 该创建会话请求应答消息中携带有 UE的 IP地 址;步 4聚 4, MME向演进的 UTRAN发送切换请求消息,通知演进的 UTRAN 分配缺省 载的空口资源; 步骤 5 , ΜΜΕ接收演进的 UTRAN返回的切换应 答消息, 其中, 切换应答消息中携带有空口资源的接入参数。 其中, MME获取 UE的用户信息包括以下之一: MME获取本地保存的 UE的用户信息; MME从 PS到 PS切换请求消息中解析出 UE的用户信息; MME根据 UE的标识向 UE的归属网络服务器获取 UE的用户信息。 其中, CS到 PS切换应答消息、 切换准备应答消息和切换命令中携带有 空口资源的接入参数; 在向 UE发送切换命令之后, 方法还包括: UE根据空 口资源的接入参数接入到 PS域网络。 其中, 切换应答消息以及 CS to PS切换应答消息中携带有为 UE分配的
IP地址。 其中, eMSC向 UTRAN/GERAN发送切换准备应答消息之前, 还包括: eMSC分配 eMSC的用于媒体连接的 IP地址和端口号; UE或 eMSC根据对 端的 IP地址, 釆用缺省承载建立 UE与 eMSC之间的媒体连接; 通过为 UE 分配的网络资源传输 UE与远端之间的媒体数据包括:通过媒体连接传输 UE 与远端之间的媒体数据。 其中, eMSC通过源 MSC与的 UTRAN或 GERAN相连; 在建立 UE与 eMSC之间的媒体连接时, 还包括: eMSC 建立与远端的媒体连接, 或者, eMSC建立与源 MSC间电路 i或 载。 才艮据本发明的另一方面,提供了一种单信道语音连续性实现系统, 包括:
UTRAN或 GERAN, 设置为通知 eMSC准备将 UE由 CS域网络切换到 PS 域网络; eMSC, 设置为判断该 UE是否同时存在 CS语音业务和 PS数据业 务, 如果是, 则通知 PS域网络的 MME该 UE同时存在 CS语音业务和 PS 数据业务; MME, 设置为在接收到 eMSC指示 UE同时存在 CS语音业务和 PS数据业务的通知后, 在接收到该 UE的 CS到 PS切换请求消息以及该 UE 的 PS到 PS切换请求消息后, 通知 PS域网络的网元为该 UE准备网络资源, 以使 UE切换到 PS域网络后, 通过 PS域网络为该 UE准备的网络资源传输 UE与远端之间的媒体数据, 并且, MME还用于通过 CS域网络通知 UE切 换到 PS域网络。 通过本发明, UTRAN/GERAN在准备发起单信道 UE的 CS域到 PS域 的切换时, 向 eMSC发送通知, eMSC在接收到通知后, 判断该 UE是否同 时存在 CS语音业务和 PS数据业务, 如果是, 则通知目标网络的 MME, 目 标网络的 MME在接收到 eMSC的通知后, 在接收到该 UE的 CS到 PS ( CS to PS ) 切换请求消息及 PS到 PS ( PS to PS ) 切换请求后, 才通知目标网络 的网元为 UE准备网络资源, 然后通知 UE切换到目标网络, 从而使得 UE 的 CS语音业务和 PS数据业务可以同步切换, 并且, 由于目标网络在 UE切 换到目标网络之前为 UE准备了网络资源, 从而可以减少切换过程中语音中 断时间, 进一步提高用户体验。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中: 图 1为相关技术中 EPS系统架构示意图; 图 2为相关技术中的单模业务连续性架构图; 图 3为相关技术中单模语音业务连续性从电路交换域切换分组交换域的 流程图; 图 4 为 居本发明实施例一的单信道语音连续性实现系统的结构示意 图; 图 5为本发明实施例一的另一种单信道语音连续性实现系统的架构示意 图; 图 6为 居本发明实施例一的单信道语音连续性实现方法的流程图; 图 7为根据本发明实施例二的信令流程图; 图 8为根据本发明实施例三的信令流程图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是, 在 不冲突的情况下, 本申请中的实施例及实施例中的特征可以相互组合。 实施例一 图 4 为 居本发明实施例一的单信道语音连续性实现系统的结构示意 图, 包括: UTRAN/GERAN 10、 eMSC 20和目标网络 (即 PS域网络) 的 MME 30。 其中, UTRAN/GERAN 10, 设置为通知 eMSC 20准备将 UE由 CS域网络切换到 PS域网络(即目标网络); eMSC 20 , 设置为判断 UE是否 同时存在 CS语音业务和 PS数据业务, 如果是, 则通知 MME 30该 UE同时 存在 CS语音业务和 PS数据业务; MME 30设置为在接收到 eMSC 20指示 UE同时存在 CS语音业务和 PS数据业务的通知后, 在接收到该 UE的 CS 到 PS切换请求消息以及该 UE的 PS到 PS切换请求消息后,通知 PS域网络 的网元为该 UE准备网络资源, 以使 UE切换到 PS域网络后, 通过 PS域网 络为其准备的网络资源传输 UE与远端之间的媒体数据, 并且, MME 30还 设置为通过 CS域网络 (即源网络) 通知 UE切换到 PS域网络。 由于相关技术中在执行 SR UE从 CS域到 PS域的切换时, 如果 SR UE 当前还有 PS i或业务, SR UE的 CS到 PS的切换和 PS到 PS的切换是 目互独 立, 从而将导致 SR UE的 CS域业务和 PS域业务的切换不同步。 而本实施 例提供的上述系统中, UTRAN/GERAN 10在准备发起单信道 UE的 CS域到 PS域的切换时, 向 eMSC 20发送通知, eMSC 20在接收到通知后, 判断该 UE是否同时存在 CS语音业务和 PS数据业务, 如果是, 则通知目标网络的 MME 30, 目标网络的 MME 30在接收到 eMSC的通知后, 在接收到该 UE 的 CS to PS切换请求消息及 PS to PS切换请求后, 才通知目标网络的网元为 UE准备网络资源, 然后通知 UE切换到目标网络, 从而使得 UE的 CS语音 业务和 PS数据业务可以同步切换, 并且, 由于目标网络在 UE切换到目标网 络之前为 UE准备了网络资源, 从而可以减少切换过程中语音中断时间。 在本发明优选实施例中源 MSC不具有增强能力, UTRAN/GERAN 10与 eMSC 20之间通过源 MSC进行通信, 因此, 上述系统还包括源 MSC, 图 5 为本实施例的另一种单信道语音连续性实现系统架构示意图,该系统还包括: 源 MSC 40, 由 E-UTRAN接入目标网络, 目标网络(即 PS i或网络 ) 中还包 括 S-GW/P-GW和 PCRF等网元。 本实施例中 UTRAN/GERAN 10在通知 eMSC 20准备将 UE切换到 PS 域网络时, UTRAN/GERAN 10还可以判断该 UE是否同时存在 CS语音业务 和 PS数据业务, 并在通知 eMSC 20准备将 UE切换到 PS域网络时, 将判断 结果通知给 eMSC 20 , eMSC 20根据该判断结果可以判断 UE是否同时存在 CS语音业务和 PS数据业务。 或者, eMSC 20也可以根据 SGSN的通知判断 UE是否同时存在 CS语音业务和 PS数据业务, 例如, 当 UE在 SGSN发起 或结束数据业务的时候, SGSN 可以通知 UE 登记到 SGSN 时联合注册的 eMSC 20当前 UE是否正在发起数据业务, eMSC 20根据 SGSN的通知可以 确定 UE是否同时存在 CS语音业务和 PS数据业务。 图 6为 居本发明实施例一的单信道语音连续性实现方法的流程图, 主 要包括以下步 4聚 (步 4聚 S602 -步 4聚 S610 ): 步骤 S602, UTRAN/GERAN通知 eMSC准备将 UE由 CS域网络切换到 PS域网络; 例如, 源 MSC为增强型的 MSC (即 eMSC ), 则 UTRAN/GERAN根据 UE上报的无线测量报告, 决定发起网络间接入切换, 向 eMSC发送切换请 求消息通知 eMSC准备切换该 UE到 PS域网络;源 MSC为非增强型的 MSC, 则 UTRAN/GERAN根据 UE上报的无线测量报告, 决定发起网络间接入切 换, 向源 MSC发送切换请求消息, 源 MSC 居切换请求携带的目标小区信 息, 向 eMSC发送切换准备消息通知 eMSC准备切换该 UE到 PS域网络。 步骤 S604, eMSC确定该 UE同时存在 CS语音业务和 PS数据业务, 通 知 PS域网络的 MME该 UE同时存在 CS语音业务和 PS数据业务; 例如, UTRAN/GERAN在准备切换 UE至 PS i或网络时, UTRAN/GERAN 可以判断该 UE是否同时存在 CS语音业务和 PS数据业务,在通知 eMSC准 备切换 UE到 PS域网络时,将判断结果通知给 eMSC,例如, UTRAN/GERAN 可以将用于指示 UE是否同时存在 CS语音业务和 PS数据业务的业务指示标 识携带在上述的切换请求消息中发送给 eMSC, eMSC才艮据该业务指示标识 的指示, 可以确定 UE是否同时存在 CS语音业务和 PS数据业务; 或者, UE在 SGSN发起或结束 PS数据业务时, SGSN可以向该 UE在 登记到 SGSN时联合注册的 eMSC发送通知, eMSC根据该通知可以确定 UE 是否同时存在 CS语音业务和 PS数据业务。 例如, eMSC可以通过在向 MME发送的 CS to PS切换请求消息中携带 业务指示标识来通知 MME该 UE是否同时存在 CS语音业务和 PS数据业务, 例如, 可以占用一个比特位来指示, 如果该比特位的取值为 1 , 则指示 UE 同时存在 CS语音业务和 PS数据业务; 或者, eMSC也可以向 MME发送一 个专用的通知消息, 通过该通知消息来指示 MME该 UE是否同时存在 CS 语音业务和 PS数据业务。 步骤 S606, MME在接) 到 UE的 CS到 PS切换请求消息以及 UE的 PS 到 PS切换请求消息后, 通知 PS域网络的网元为 UE准备网络资源; 由于 UE同时存在 CS语音业务和 PS数据业务, 因此, MME在接收到 该 UE的 CS到 PS切换请求消息以及 UE的 PS到 PS切换请求消息后, 才通 知 PS域网络的网元为 UE准备网络资源。 如果 eMSC通知 UE并不存在 PS 数据业务, 则 MME在接收到 CS to PS切换请求后即通知 PS域网络的网元 为 UE准备网络资源。 例如, MME可以按照以下步骤通知 PS域网络的网元 为 UE准备网络资源: 步骤 1 , MME获取 UE 的用户信息, 根据用户信息选择 PS 域网络的
S-GW; 其中, MME可以按照以下方式获取 UE的用户信息: ( 1 ) MME获取本 地保存的该 UE的用户信息; ( 2 ) MME从 PS到 PS切换请求消息中解析出 该 UE的用户信息, 即从 UE的上下文信息中解析出该 UE的用户信息; (3 ) MME根据 UE的标识向 UE的归属网络服务器获取该 UE的用户信息。 步骤 2 , MME向 S-GW发送创建会话请求消息, 请求创建 UE的缺省承 载; 其中, MME接收到的 PS到 PS切换请求消息中携带有所述 UE的上下 文信息, 该上下文信息中包含有该 UE的缺省承载的标识; 步骤 3 , 所述 S-GW为所述缺省承载分配承载资源, 向所述 MME返回 创建会话请求应答消息,该创建会话请求应答消息中携带有所述 UE的 IP地 址; 步骤 4, 所述 MME向演进的 UTRAN发送切换请求消息, 通知所述演 进的 UTRAN分配所述缺省承载的空口资源; 步骤 5 , 所述 MME接收所述演进的 UTRAN返回的切换应答消息, 其 中, 所述切换应答消息中携带有所述空口资源的接入参数。 步骤 S608, MME通过 CS域网络通知 UE切换到 PS域网络; 例如, MME可以向 eMSC发送 CS to PS切换应答消息消息, 该消息中 可以携带目标网络分配的空口资源的接入参数, eMSC在接收到该消息后, 可以向源 MSC或直接 UTRAN/GERAN返回切换准备应答消息,该切换准备 应答消息中携带上述空口资源的接入参数, 最终由 UTRAN/GERAN 向 UE 发送切换命令消息, 该切换命令消息中携带上述空口资源的接入参数, 通知 UE切换到目标网络, UE接收到切换命令消息后, 根据上述空口资源的接入 参数接入到目标网络。 步骤 S610 , UE切换到 PS域网络后, 通过 PS域网络为 UE准备的上述 网络资源传输 UE与远端之间的媒体数据。 例如, 可以在 UE与 eMSC之间建立一段临时的媒体连接, 在 UE切换 到 PS域网络之后, 在 IMS远端媒体更新成功前, 可以通过该媒体连接传输 UE与远端之间的媒体数据。 例如, 可以由 UE主动发起建立该媒体连接, 也 可以由 eMSC主动发起。 这样可以减少 UE与远端之间的通话中断的时间。 或者, 也可以不在 UE与 eMSC之间建立临时的媒体连接, 而是按照图 3所示的流程执行, 执行步骤 307之后的步骤, 与图 3所示的流程的不同之 处在于, 在本实施例中, 由于目标网络已经为 UE建立缺省 载, 因此, 不 需要再执行步骤 309。 从而可以减少 UE与远端的通讯中断的时间。 通过本实施例的上述单信道语音连续性实现方法, eMSC在通知目标网 络的 MME准备切换 UE到 PS i或网络时,通知 MME该 UE是否同时存在 PS 数据业务和 CS语音业务, 如果是, 则 MME在接收到该 UE的 CS to PS切 换请求消息和 PS to CS切换请求消息之后, 才请求目标网络的网元为 UE分 配网络资源, 并在网络资源分配成功后再通知 UE切换到 PS域,从而可以保 证 UE的 CS语音业务和 PS数据业务的同步切换。 实施例二 本实施例所描述的为 SR UE在 GERAN/UTRAN网络同时发生电路域语 音业务和 PS域数据业务时, 切换到 PS域网络的流程。 图 7为本实施例的信 令流程图, GERAN/UTRAN根据 SR UE上报的测量报告, 决定发起接入网 络切换, 向源 MSC发送切换请求消息, 主要包括以下步骤:
701. GERAN/UTRAN根据 SR UE上报的无线测量报告, 决定发起网络 间接入切换; 702. GERAN/UTRAN感知 SU UE在该网络同时发起 CS语音业务和 PS 数据业务, 向源 MSC发送切换请求消息, 该消息中目标地址位置小区为目 标 PS域网络小区, 并且, 该消息中还携带有 PS业务指示标识, 该 PS业务 指示标识用于指示该 UE在源网络同时发起了 CS语音业务和 PS数据业务;
703. GERAN/UTRAN同时向 SGSN发送切换请求消息; 704. 源 MSC接收到切换请求消息后, 根据目标小区信息选择 eMSC, 向 eMSC发送切换准备消息, 消息中携带源小区和目标小区信息、 PS业务指 示标识以及用户身份标识 (例如 IMSI ), 如果源 MSC判断该设备中有 UE当 前驻留的 SGSN地址, 则将 SGSN地址也携带在该消息中;
705. eMSC 接收到切换准备消息, 根据目标小区, 选择 MME, 向该 MME发送 CS to PS切换请求消息, 该消息中携带源小区和目标小区信息、
PS业务指示标识以及用户身份标识 (例如, IMSI ), 如果接收到的切换准备 消息中携带有 SGSN地址, 则也将该 SGSN地址携带在 CS to PS切换请求消 息中。 其中, 如果源 MSC和 eMSC如果为同一个实体, 则不需要传输上述源 MSC和 eMSC之间的消息;
706. SGSN向 MME发送 PS to PS切换请求消息, 该消息中携带有 UE 的上下文信息, 该上下文信息中包含有 UE的缺省承载的标识;
707-708. MME判断接收到的 CS to PS切换请求消息中是否携带有 PS 业务指示标识, 如果是, 则 MME在接收到步 4聚 706的 PS to PS切换请求消 息后, 选择 S-GW/P-GW, 请求 S-GW/P-GW创建步骤 706 中的上下文信息 中的标识所指示的缺省 7 载;
709. MME缺省创建完毕后, 才艮据目标小区信息选择目标 EUTRAN, 向 目标 EUTRAN发送切换请求消息, 通知 EUTRAN分配空口资源, 消息携带
707-708创建的缺省 载 S-GW用户面连接 EUTRAN的连接地址。 EUTRAN 分配空口资源完成后, 建立 EUTRAN与 S-GW间媒体连接, 向 MME返回 切换应答消息, 消息中携带所分配的空口资源接入参数;
710. MME向 eMSC返回 CS to PS切换应答消息,消息中携带 EUTRAN 空口资源接入参数和 UE的 IP地址; 711. 同时, MME向 SGSN返回 PS to PS切换应答消息, 该消息中携带
E-UTRAN分配的空口资源的接入参数;
712. SGSN向 GERAN/UTRAN返回切换应答消息;
713. eMSC接收到 CS to PS切换应答消息后,分配用于 eMSC与 SR UE 间媒体连接的用户面 IP地址和端口号,并根据收到 UE IP地址生成语音业务 流模板 ( Traffic Flow Template, 简称为 TFT ), 该模板用于指示 UE和 eMSC 建立 SR UE与 eMSC间媒体连接, 并通过该语音 TFT接收 /发送语音媒体; 其中, 语音 TFT包含 UE侧和 eMSC侧 IP地址以及端口号, UE侧端口 设置网络规定的缺省值;
714. eMSC返回切换准备应答消息给 Source MSC, 消息中携带 713步 骤生成的 TFT ,用户建立 CS承载的切换号码,以及 EUTRAN空口接入参数;
715. 源 MSC收到切换准备应答消息, 根据切换号码建立 Source MSC 与 eMSC间 CS 载;
716. 源 MSC 向 GERAN/UTRAN 返回切换应答消息, 消息中携带 EUTRAN空 Π接入参数和 TFT; 717. GERAN/UTRAN同时收到来自 SGSN和源 MSC的切换应答消息, 通过切换命令消息, 通知 SR UE进行切换, 消息中携带 EUTRAN空口接入 参数和 TFT;
718. SR UE才艮据 EUTRAN空口接入参数切换到 EUTRAN网络;
719. SR UE向 EUTRAN网络发送切换完成消息; 720. EUTRAN收到切换完成消息, 通过切换通知消息通知 MME;
721. MME向 eMSC返回切换完成消息, eMSC通知 Source MSC; 722. Source MSC收到目标网络的切换完成消息, 是否 GERAN/UTRAN 网络资源和空口资源;
723-726. MME通过 S-GW通知 P-GW将之前创建的缺省 载更新到新 的 S-GW; 727. eMSC和 SR UE建立两者媒体连接; 两者之间的媒体连接包含两部分。 第一部分由 eMSC与 P-GW之间连接 为 IP数据承载, 该连接遵从 SGi口标准协议; 另一部分为 P-GW与 SR UE 见媒体连接, 该连接为 EPS承载, 遵从 EPS网络相关协议。 eMSC与 P-GW 之间 IP数据承载不需要单独建立, 传输过程中仅需要目的 IP和源 IP就能相 互传递, eMSC 和 SR UE 建立两者直接媒体连接关键需要建立 SR UE 和 P-GW之间的 EPS承载连接。 例如, 可以通过 UE或 eMSC釆用切换准备过 程时预留的缺省承载创建该媒体连接。 eMSC和 SR UE建立两者媒体连接建立完毕后, eMSC 4巴收到 Source MSC的电路域语音数据包转换为 IP语音数据包, 根据 TFT通过两者之间的 媒体连接发送给 SR UE, 同时收到来自 SR UE的 IP语音数据包, 转换为电 路域语音包转发给 Source MSC。
728. SR UE根据语音 TFT接收和发送 IP语音数据包;
729. 如果 SR UE尚未在 IMS进行注册, SR UE向该用户归属地 IMS 进行 IMS注册; 730. 注册完毕后, SR UE向 IMS网元发送会话邀请消息, 通知 IMS进 行远端更新, 消息中携带 SR UE媒体 IP地址和新分配的端口号以及会话转 移标识 ( Session Transfer Identification )„ IMS收到会话邀请消息后, 更新远 端媒体连接;
731. 远端更新成功后, 返回完成消息, 消息中携带远端媒体的 IP地址 和端口号, 远端语音数据包, 由原来发给 Source MSC改为发给 SR UE, 同 时 UE收到完成消息后, 终止发向 eMSC, 改为发向远端媒体 IP和端口;
732. 释放 SR UE和 eMSC之间媒体连接, 释放 eMSC侧的 IP地址和端 α。 通过本实施例, eMSC在通知 UE切换到目标网络中之前, 先通知目标 网络为 UE准备网络资源, 建立 UE的缺省承载, 并在建立缺省承载的过程 中为 UE分配 IP地址, 从而进一步减少了切换过程中语音中断的时间。 实施例三 本实施例对 SGSG通知 MSC当前 UE是否正发起 PS数据业务的流程进 行说明。 图 8为本实施例的信令流程, 主要包括如下步骤:
801. SR UE在 PS域进行注册, 并通过联合注册由 SGSN注册到 MSC 上; 802. SR UE发起数据业务请求;
803. SGSN通过通知消息, 告知 MSC当前 SR UE发起数据业务;
804. SR UE与远端 IP网络进行数据交互;
805. SR UE发起释放数据业务请求;
806. SGSN通过通知消息通知 MSC当前 SR UE已经取消数据业务; 807. PS网络释放 UE的 PS连接。 通过本实施例, 可以通过联合注册的 SGSN通知 MSC: SR UE是否正 发起 PS数据业务,从而使得 MSC可以判断 SR UE是否同时存在 CS语音业 务和 PS数据业务。 从以上的描述中, 可以看出, 在本发明实施例中, UTRAN/GERAN在准 备发起单信道 UE的 CS域到 PS域的切换时, 向 eMSC发送通知, eMSC在 接收到通知后, 判断该 UE是否同时存在 CS语音业务和 PS数据业务, 如果 是, 则通知目标网络的 MME, 目标网络的 MME在接收到 eMSC的通知后, 在接收到该 UE的 CS到 PS ( CS to PS )切换请求消息及 PS到 PS ( PS to PS ) 切换请求后, 才通知目标网络的网元为 UE准备网络资源, 然后通知 UE切 换到目标网络, 从而使得 UE的 CS语音业务和 PS数据业务可以同步切换, 并且, 由于目标网络在 UE切换到目标网络之前为 UE准备了网络资源, 从 而可以减少切换过程中语音中断时间, 进一步提高用户体 -险。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 并 且在某些情况下, 可以以不同于此处的顺序执行所示出或描述的步骤, 或者 将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软件 结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的 ^"神和 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. 一种单信道语音连续性实现方法,用于用户设备 UE从电路交换 CS域 网络切换到分组交换 PS域网络的过程, 所述方法包括:
全球移动通信系统无线接入网 UTRAN或 GSM EDGE无线接入网 GERAN通知增强移动交换中心 eMSC准备将 UE由 CS域网络切换到 PS域网络;
所述 eMSC确定所述 UE同时存在 CS语音业务和 PS数据业务, 通知所述 PS域网络的移动性管理实体 MME所述 UE同时存在 CS语 音业务和 PS数据业务;
所述 MME在接收到所述 UE的 CS到 PS切换请求消息以及所述 UE的 PS到 PS切换请求消息后, 通知所述 PS域网络的网元为所述 UE准备网络资源;
所述 MME通过所述 CS域网络通知所述 UE切换到所述 PS域网 络;
所述 UE切换到所述 PS域网络后,通过所述 PS域网络为所述 UE 准备的所述网络资源传输所述 UE与远端之间的媒体数据。
2. 根据权利要求 1所述的方法, 其中,
所述 UTRAN或 GERAN通知 eMSC准备将 UE由 CS域网络切换 到 PS域网络包括: 所述 UTRAN或 GERAN判断所述 UE是否同时存 在 CS语音业务和 PS数据业务, 向所述 eMSC发送通知, 通知准备将 UE由 CS域网络切换到 PS域网络, 其中, 所述通知中携带有指示所 述 UE是否同时存在 CS语音业务和 PS数据业务的业务指示信息; 所述 eMSC确定所述 UE同时存在 CS语音业务和 PS数据业务包 括: 所述 eMSC从所述通知中解析出所述业务指示信息, 才艮据所述业 务指示信息的指示, 确定所述 UE同时存在 CS语音业务和 PS数据业 务。
3. 根据权利要求 1 所述的方法, 其中, 还包括: 所述 CS域网络的服务 GPRS支持节点 SGSN向所述 eMSC发送通知消息, 所述通知消息用 于通知所述 eMSC所述 UE是否正发起 PS数据业务; 所述 eMSC确定所述 UE同时存在 CS语音业务和 PS数据业务包 括: 所述 eMSC解析所述通知消息获知所述 UE正发起 PS数据业务, 确定所述 UE同时存在 CS语音业务和 PS数据业务。
4. 根据权利要求 3所述的方法, 其中, 所述 SGSN向所述 eMSC发送通 知消息包括: 当所述 UE在所述 SGSN发起或结束 PS数据业务时, 所 述 SGSN向所述 eMSC发送所述通知消息。
5. 根据权利要求 1至 4中任一项所述的方法, 其中, 所述 eMSC通知所 述 MME所述 UE 同时存在 CS语音业务和 PS数据业务包括: 所述 eMSC向所述 MME发送所述 CS到 PS切换请求消息, 所述 CS到 PS 切换请求消息中携带有指示所述 UE同时存在 CS语音业务和 PS数据 业务的 PS业务指示。
6. 根据权利要求 1所述的方法, 其中, 所述 MME通过所述 CS域网络通 知所述 UE切换到所述 PS域网络包括:
所述 MME向所述 eMSC发送 CS到 PS切换应答消息; 所述 eMSC向所述 UTRAN或 GERAN发送切换准备应答消息; 所述 UTRAN或 GERAN在接收到所述切换准备应答消息以及所 述 PS到 PS切换请求消息的切换应答消息之后, 向所述 UE发送切换 命令, 通知所述 UE切换到所述 PS域网络。
7. 根据权利要求 6所述的方法, 其中, 所述 PS到 PS切换请求消息中携 带有所述 UE的上下文信息 ,所述上下文信息中包含所述 UE的缺省 7 载的信息; 所述 MME通知所述 PS域网络的网元为所述 UE准备网络 资源包括:
步骤 1 , 所述 MME获取所述 UE的用户信息, 居所述用户信息 选择所述 PS域网络的服务网关实体 S-GW;
步骤 2, 所述 MME向所述 S-GW发送创建会话请求消息, 请求 创建所述 UE的缺省承载;
步骤 3 , 所述 S-GW为所述缺省承载分配承载资源, 向所述 MME 返回创建会话请求应答消息, 该创建会话请求应答消息中携带有所述 UE的 IP地址; 步骤 4, 所述 MME向演进的 UTRAN发送切换请求消息, 通知所 述演进的 UTRAN分配所述缺省 载的空口资源;
步骤 5 ,所述 MME接收所述演进的 UTRAN返回的切换应答消息, 其中, 所述切换应答消息中携带有所述空口资源的接入参数。
8. 根据权利要求 7所述的方法, 其中, 所述 MME获取所述 UE的用户 信息包括以下之一:
所述 MME获取本地保存的所述 UE的用户信息;
所述 MME从所述 PS到 PS切换请求消息中解析出所述 UE的用 户信息;
所述 MME根据所述 UE的标识向所述 UE的归属网络服务器获取 所述 UE的用户信息。
9. 根据权利要求 6所述的方法, 其中, 所述 CS到 PS切换应答消息、 所 述切换准备应答消息和所述切换命令中携带有所述空口资源的接入参 数; 在向所述 UE发送切换命令之后, 所述方法还包括: 所述 UE根据 所述空口资源的接入参数接入到所述 PS域网络。
10. 根据权利要求 7 所述的方法, 其中, 所述切换应答消息以及所述 CS 到 PS切换应答消息中携带有为所述 UE分配的所述 IP地址。
11. 根据权利要求 10 所述的方法, 其中 , 所述 eMSC 向所述 UTRAN/GERAN发送切换准备应答消息之前, 还包括:
所述 eMSC分配所述 eMSC的用于所述媒体连接的 IP地址和端口 号;
所述 UE或所述 eMSC根据对端的 IP地址, 釆用所述缺省承载建 立所述 UE与所述 eMSC之间的媒体连接;
通过为所述 UE分配的网络资源传输所述 UE与远端之间的媒体数 据包括: 通过所述媒体连接传输所述 UE与远端之间的媒体数据。
12. 根据权利要求 11所述的方法, 其中, 所述 eMSC通过源 MSC与所述 的 UTRAN或 GERAN相连; 在建立所述 UE与所述 eMSC之间的媒 体连接时, 还包括: 所述 eMSC建立与所述远端的媒体连接, 或者, 所述 eMSC建立与所述源 MSC间电路域 载。
3. —种单信道语音连续性实现系统, 包括:
UTRAN或 GERAN, 设置为通知 eMSC准备将 UE由 CS域网络 切换到 PS域网络;
所述 eMSC, 设置为判断所述 UE是否同时存在 CS语音业务和 PS数据业务, 如果是, 则通知所述 PS域网络的 MME所述 UE同时 存在 CS语音业务和 PS数据业务;
所述 MME, 设置为在接收到所述 eMSC指示所述 UE 同时存在 CS语音业务和 PS数据业务的通知后, 在接收到所述 UE的 CS到 PS 切换请求消息以及所述 UE的 PS到 PS切换请求消息后,通知所述 PS 域网络的网元为所述 UE准备网络资源, 以使 UE切换到所述 PS域网 络后, 通过所述 PS 域网络为所述 UE 准备的所述网络资源传输所述 UE与远端之间的媒体数据, 并且, 所述 MME还用于通过所述 CS域 网络通知所述 UE切换到所述 PS域网络。
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