WO2011134436A1 - 电路交换域到分组交换域的切换方法和设备及通信系统 - Google Patents

电路交换域到分组交换域的切换方法和设备及通信系统 Download PDF

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Publication number
WO2011134436A1
WO2011134436A1 PCT/CN2011/073591 CN2011073591W WO2011134436A1 WO 2011134436 A1 WO2011134436 A1 WO 2011134436A1 CN 2011073591 W CN2011073591 W CN 2011073591W WO 2011134436 A1 WO2011134436 A1 WO 2011134436A1
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WIPO (PCT)
Prior art keywords
sgw
voip
mgw
handover
dedicated bearer
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PCT/CN2011/073591
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English (en)
French (fr)
Inventor
刘海
吴晓波
徐小英
朱文若
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP11774427A priority Critical patent/EP2566242A1/en
Priority to JP2013506484A priority patent/JP5536954B2/ja
Publication of WO2011134436A1 publication Critical patent/WO2011134436A1/zh
Priority to US13/664,302 priority patent/US9078173B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • 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
    • H04W36/0005Control 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

Definitions

  • Circuit switching domain to packet switching domain switching method and device and communication system The present application claims to be filed on April 30, 2010, the application number is 201010168695. 6 , the invention name is "circuit switching domain to packet switching domain switching method and The priority of the Chinese application of the device and the communication system is hereby incorporated by reference in its entirety.
  • the present invention relates to the field of communications technologies, and in particular, to a circuit switching domain to a packet switched domain switching method and device, and a communication system.
  • the third-generation partner project standards organization launched a new generation of evolution network architecture, in which the core network part is the System Architecture Evolution (SAE) network, and the access network part is long-term evolution (LTE, Long).
  • SAE System Architecture Evolution
  • LTE Long-term evolution
  • LTE long-term evolution
  • E-UTRAN Universal Mobile communication system Terrestrial Radio Access Network
  • a network such as SAE/LTE that provides only a PS domain is called a pure PS domain network.
  • mobile communication services can be divided into:
  • CS Circuit Switching
  • the services carried by the packet switching (PS, Packet Switching) domain include data services and session services, and the session services include Voice over Internet Protocol (VoIP) services.
  • VoIP Voice over Internet Protocol
  • voice services can be carried in the CS domain or in the PS domain.
  • users may often need to switch from 2G/3G networks to LTE networks during communication. Therefore, how to maintain the voice continuity of the network handover process is a technical problem that needs to be studied and solved.
  • the embodiments of the present invention provide a circuit switching domain to packet switching domain switching method and device, and a communication system, which are beneficial for maintaining voice continuity when the UE switches from the CS domain to the PS domain.
  • a method for switching a circuit switched domain to a packet switched domain including:
  • the target mobility management entity receives a circuit switched domain CS to a packet switched domain PS handover request message from a corresponding first user equipment UE of the mobile switching center MSC;
  • the VoIP dedicated bearer is used to carry a VoIP session between the first UE and the MGW.
  • a method for switching a circuit switched domain to a packet switched domain including:
  • the target mobility management entity receives a CS to PS handover request message from the corresponding first UE of the MSC, and a PS handover request message from the corresponding first UE of the SGSN;
  • the VoIP dedicated bearer After the first UE handover is completed, triggering establishment of an Internet Protocol Voice VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW, or triggering establishment of a VoIP dedicated bearer corresponding to the first UE between the SGW and the PGW, so that the first UE is used. After switching to the target access network, the VoIP dedicated bearer is used to carry a VoIP session between the first UE and the MGW.
  • a method for switching a circuit switched domain to a packet switched domain includes:
  • the first UE receives a handover command sent by the source access network, where the handover command carries the handover resource information prepared by the target access network for the first UE;
  • a method for switching a circuit switched domain to a packet switched domain including:
  • the target mobility management entity receives the CS to PS handover request message from the corresponding first UE of the MSC, and the CS to PS handover request message carries the GTP-U tunnel prepared by the MGW for the VoIP dedicated bearer of the first UE;
  • the handover request message carries the GTP-U tunnel prepared by the MGW as a VoIP dedicated bearer of the first UE, and indicates that the target access network prepares handover resources for the first UE, and Trimming to establish a VoIP dedicated bearer corresponding to the first UE between the target access network and the MGW;
  • a VoIP dedicated bearer of a UE carries a prepared GTP-U tunnel, so that the first UE, after switching to the target access network, uses the VoIP dedicated bearer to carry a VoIP session between the first UE and the MGW.
  • a mobility management entity including:
  • a first receiving module configured to receive a CS to PS handover request message from a corresponding first UE of the mobile switching center MSC;
  • a first dedicated bearer triggering module configured to trigger establishment of an Internet Protocol voice VoIP dedicated bearer corresponding to the first UE between the serving gateway SGW and the media gateway MGW, or trigger establishment of a VoIP corresponding to the first UE between the SGW and the packet data gateway PGW Dedicated bearer
  • a first sending module configured to send a handover request message to the target access network, indicating the target connection
  • the network is ready to switch resources for the first UE
  • a second sending module configured to send a CS to PS handover response message corresponding to the first UE to the MSC, where the CS to PS handover response message carries the handover resource prepared by the target access network for the first UE, so that After the first UE switches to the target access network, the VoIP dedicated bearer is used to carry a VoIP session between the first UE and the MGW.
  • a mobility management entity including:
  • a third receiving module configured to receive a CS to PS handover request message from a corresponding first UE of the MSC, and a PS handover request message corresponding to the first UE from the SGSN;
  • a third sending module configured to send a handover request message to the target access network, to instruct the target access network to prepare a handover resource corresponding to the PS handover request message from the SGSN for the first UE;
  • a fourth sending module configured to send a CS to PS handover response message corresponding to the first UE to the MSC, and send a PS handover response message corresponding to the first UE to the SGSN, where the CS to PS handover response message carries Decoding resources prepared by the target access network for the first UE;
  • a second dedicated bearer triggering module configured to: after the first UE handover is completed, trigger to establish an inter-network protocol voice VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW, or trigger establishment of a corresponding first UE between the SGW and the PGW
  • the VoIP dedicated bearer is used to enable the first UE to use the VoIP dedicated bearer to carry the VoIP session between the first UE and the MGW after switching to the target access network.
  • a user equipment including:
  • a fourth receiving module configured to receive a handover command that is sent by the source access network, where the handover command carries the handover resource information prepared by the target access network for the user equipment UE;
  • a switching module configured to access the target access network
  • a third triggering module configured to: after the user equipment UE handover is completed, trigger to establish a VoIP dedicated bearer corresponding to the UE between the SGW and the media gateway MGW, or trigger establishment of a VoIP dedicated to the UE between the SGW and the PGW Carry
  • a parameter configuration module configured to configure a VoIP session parameter of the VoIP dedicated bearer, to use the VoIP dedicated bearer to carry a VoIP session between the UE and the MGW.
  • a mobility management entity including:
  • a fifth receiving module configured to receive a CS to PS handover request message from the MSC corresponding to the first UE, where the CS to PS handover request message carries the MGW to prepare for the VoIP dedicated bearer of the first UE.
  • a fourth triggering module configured to send a handover request message to the target access network, where the handover request message carries the GTP-U tunnel prepared by the MGW as a VoIP dedicated bearer of the first UE, indicating that the target access network is the first
  • a UE prepares to switch resources, and triggers establishment of a VoIP dedicated bearer corresponding to the first UE between the target access network and the MGW;
  • a fifth sending module configured to send a CS to PS handover response message corresponding to the first UE to the MSC, where the CS to PS handover response message carries the handover resource prepared by the target access network for the first UE, and
  • the target access network is a GTP-U tunnel prepared by the VoIP dedicated bearer of the first UE, so that after the first UE switches to the target access network, the VoIP dedicated bearer is used to carry the first UE and the VoIP session between MGWs.
  • the embodiment provided by the first aspect of the present invention can implement the UE to switch from the CS domain to the PS domain, and in the CS to PS handover process, the MME triggers establishment of a relationship between the SGW and the MGW or between the SGW and the PGW.
  • the UE's VoIP dedicated bearer should be used to quickly map the voice service in the CS domain to the VoIP session of the target network after the UE switches to the target network, and use the established VoIP dedicated bearer to carry its VoIP data stream, which is beneficial to maintain Voice continuity of UE domain handover.
  • the embodiments provided by the second and third aspects of the present invention may implement that the UE switches from the CS domain to the PS domain, and after the CS to PS handover is completed, the UE or the MME triggers establishment of the SGW and the MGW or the SGW and the PGW corresponding to the UE.
  • the VoIP dedicated bearer can be used to quickly map the voice service in the CS domain to the VoIP session of the target network after the UE switches to the target network, and use the established VoIP dedicated bearer to carry its VoIP data stream, which is beneficial to maintain the UE domain handover. Voice continuity.
  • the embodiment provided by the fourth aspect of the present invention can implement the handover of the UE from the CS domain to the PS domain, and after the CS to PS handover is completed, the MME triggers establishment of a VoIP dedicated bearer corresponding to the UE between the eNB and the MGW, and thus can be switched at the UE.
  • the voice service in the CS domain is quickly mapped to the VoIP session of the target network, and the established VoIP dedicated bearer is used to carry the VoIP data stream, which is beneficial to maintain the voice continuity of the UE domain handover.
  • FIG. 1 is a schematic diagram of a 2G/3G network and a SAE network network according to an embodiment of the present invention
  • FIG. 1 is a schematic flowchart of a CS to PS handover method according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic flowchart of a CS to PS handover method according to Embodiment 2 of the present invention
  • FIG. 3 is a schematic flowchart of a CS to PS handover method according to Embodiment 3 of the present invention.
  • FIG. 4 is a schematic flowchart of a CS to PS switching method according to Embodiment 4 of the present invention.
  • FIG. 5 is a schematic flowchart of a CS to PS handover method according to Embodiment 5 of the present invention.
  • 6-a is a schematic flowchart of a CS to PS handover method according to Embodiment 6 of the present invention.
  • FIG. 6 is a schematic flowchart of another CS to PS handover method according to Embodiment 6 of the present invention
  • FIG. 7 is a schematic flowchart of another CS to PS handover method according to Embodiment 7 of the present invention
  • FIG. 8 is a schematic flowchart of another CS to PS handover method according to Embodiment 8 of the present invention.
  • FIG. 9 is a schematic diagram of a mobility management entity according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of another mobility management entity according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram of another user equipment according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of another mobility management entity according to an embodiment of the present invention. detailed description
  • Embodiments of the present invention provide a circuit switching domain to packet switching domain handover method and device, and a communication system, which are beneficial for maintaining voice continuity when a UE switches from a CS domain to a PS domain.
  • FIG. 1-a a schematic diagram of a 2G/3G and SAE network deployment network as shown in FIG. 1-a is first provided, where the E-UTRAN is mainly composed of an evolved base station (eNB, Evolution-NodeB).
  • the core network part of the evolved network includes the Mobility Management Entity (MME) and the SAE Gateway (SAE Gateway).
  • MME Mobility Management Entity
  • SAE Gateway SAE Gateway
  • the SAE gateway includes a Serving Gateway (SGW, Serving Gateway) and a Packet Data Network Gateway (PGW, PDN Gateway).
  • SGW Serving Gateway
  • PGW Packet Data Network Gateway
  • the MME is a control plane node of the core network part of the evolved network system, and carries the management function of the user equipment (UE, User Equipment) context and the user plane bearer; the SGW mainly bears the transmission function of the service data, and the PGW mainly bears the signaling transmission.
  • the Mobile Switching Center (MSC) is mainly responsible for the bearer control of the voice service.
  • the Media Gateway (MGW, Media Gateway) is mainly responsible for the bearer of the CS voice service, and the service GPRS (General Packet) General Packet Radio Service (SGSN)
  • the Serving GPRS Support Node is mainly responsible for bearer control of data services.
  • the technical solution of the embodiment of the present invention is mainly directed to how a UE switches from a 2G/3G network to a pure PS domain network such as an LTE network/High Speed Packet Access (HSPA) network, and how to maintain a continuous call during the handover process.
  • HSPA network corresponding target mobility management entity is the SGSN
  • the corresponding access network device includes a radio network controller (RNC, Radio Network Controller) 0
  • RNC Radio Network Controller
  • An embodiment of a method for switching a circuit switched domain to a packet switched domain is described in the following, and may include: the target mobility management entity receives the MSC from the MSC. Corresponding to the CS to PS handover request message of the first UE; triggering establishment of a VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW, or triggering establishment of a VoIP dedicated bearer corresponding to the first UE between the SGW and the PGW; The network sends a handover request message, indicating that the target access network prepares handover resources for the first UE, and sends a CS to PS handover response message corresponding to the first UE to the MSC, where the CS to PS handover response message carries the target access network as the first UE.
  • the prepared handover resource is used to enable the first UE to use the VoIP dedicated bearer to carry the VoIP session between the first UE and the MGW after switching to the target access network.
  • the specific process may include:
  • the target mobility management entity receives a CS to PS handover request message from a corresponding first UE of the MSC.
  • the target mobility management entity in this embodiment may be, for example, an MME corresponding to the LTE network, or an SGSN corresponding to the HSPA network, and may also be a network entity responsible for mobility management functions in other types of PS domain networks;
  • the foregoing MSC may be a visited MSC (for example, an MSC that is closer to the target network), or may be a serving MSC of the first UE.
  • the CS-to-PS handover request message of the first UE may carry the address information of the MGW, and may of course carry other related information.
  • the target mobility management entity triggers establishing a VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW, or triggers establishing a VoIP dedicated bearer corresponding to the first UE between the SGW and the PGW;
  • the target mobility management entity may first trigger the establishment of a default bearer corresponding to the first UE between the SGW and the MGW, and then A VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW is triggered to be established.
  • the target mobility management entity may trigger the establishment of a default bearer corresponding to the first UE between the SGW and the MGW in a plurality of manners.
  • the method may include: sending an establishment session message carrying the MGW address information to the SGW, triggering the SGW.
  • a setup session message is sent to the MGW to establish a default bearer corresponding to the first UE between the SGW and the MGW.
  • the method for triggering the establishment of the VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW may include: after the default bearer of the first UE is established between the SGW and the MGW, the MGW is triggered to send a setup bearer message to the SGW to establish the SGW and the SGW.
  • the MGW is corresponding to the VoIP dedicated bearer of the first UE; or, after the default bearer of the first UE is established between the SGW and the MGW, the bearer resource command message is sent to the SGW, and the SGW is triggered to send a bearer resource command message to the MGW, and the trigger is triggered.
  • the MGW initiates a dedicated bearer setup procedure to establish a VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW.
  • the VoIP dedicated bearer corresponding to the first UE is established between the SGW and the MGW, after the first UE switches to the target network (for example, LTE or HSPA), the voice service in the CS network can be mapped to the VoIP session of the target network. And using the VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW to carry the VoIP session between the SGW and the MGW, and the transmission path of the VoIP session data is: the first UE ⁇ ->eNB ⁇ ->SGW ⁇ A> MGW.
  • the target network for example, LTE or HSPA
  • the target mobility management entity may first trigger the establishment of a default bearer corresponding to the first UE between the SGW and the PGW, and then A VoIP dedicated bearer corresponding to the first UE between the SGW and the PGW is triggered to be established. If the default bearer corresponding to the first UE has been established between the SGW and the PGW (for example, the first UE has a PS service in the 2G/3G network), the target mobility management entity may directly trigger the establishment of the corresponding first UE between the SGW and the PGW. VoIP dedicated bearer.
  • the target mobility management entity may trigger the establishment of a default bearer corresponding to the first UE between the SGW and the PGW in a plurality of manners.
  • the method may include: sending a setup session message to the SGW, and triggering the SGW to send a setup session to the PGW. Message to establish the first correspondence between SGW and PGW The default bearer of the UE.
  • the method for triggering the establishment of the VoIP dedicated bearer corresponding to the first UE between the SGW and the PGW may include: after the default bearer corresponding to the first UE is established between the SGW and the PGW, sending a request bearer resource command message to the SGW, triggering the SGW to The PGW sends a bearer resource command message, which in turn triggers the PGW to initiate a dedicated bearer setup process to establish a VoIP dedicated bearer corresponding to the first UE between the SGW and the PGW.
  • the VoIP dedicated bearer setup corresponding to the first UE is established between the SGW and the PGW, after the first UE switches to the target network, the voice service in the CS network can be mapped to the VoIP session of the target network, and the The VoIP dedicated bearer corresponding to the first UE between the SGW and the PGW carries the VoIP session between the SGW and the PGW, and the transmission path of the VoIP data is: the first UE ⁇ >eNB ⁇ >SGW ⁇ ->PGW ⁇ - >MGW, and VoIP session data can be forwarded between the PGW and the MGW in the form of IP packet bearers.
  • the target mobility management entity sends a handover request message to the target access network, instructing the target access network to prepare a handover resource for the first UE.
  • the target access network may correspond to an eNB in an LTE network, or an RNC in the HSPA network, or an access network device corresponding to another PS network.
  • the target access network preparing the handover resources for the first UE may include resources prepared for the default bearer and the dedicated bearer.
  • the target mobility management entity sends a CS to PS handover response message corresponding to the first UE to the MSC, where the CS to PS handover response message carries the handover resource prepared by the target access network for the first UE, so that the MSC indicates the first UE is connected.
  • the target access network is configured to enable the first UE to use the VoIP dedicated bearer to carry the VoIP session between the first UE and the MGW after switching to the target access network.
  • the target MME may further trigger the establishment of the SGW and the triggering of the VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW.
  • the video-specific bearer corresponding to the first UE is configured between the MGWs, or the video-specific bearer corresponding to the first UE between the SGW and the PGW is triggered to be established when the VoIP-specific bearer corresponding to the first UE is triggered between the SGW and the PGW.
  • the video dedicated bearer is used to carry a video session between the first UE and the MGW after accessing the target access network.
  • the establishment of the video dedicated bearer is similar to the establishment of the VoIP dedicated bearer, and the VoIP dedicated bearer and the video dedicated bearer can be established together.
  • the voice part of the video call of the first UE in the source network may be mapped to the target network.
  • only the VoIP dedicated 7-carrier may be established, and the video-specific 7-carrier may not be established.
  • the CS to PS handover response message corresponding to the first UE may be sent to the MSC.
  • the information such as the handover resource prepared by the target access network for the first UE, the address of the first UE, and the like are carried.
  • the MSC may send a handover command to the first UE by using the RNC, and the first UE may be connected to the target access network, where the handover command may carry the target access network.
  • Information such as handover resources prepared by the UE.
  • the target access network e.g., eNB
  • it can configure the VoIP session parameters of the VoIP dedicated bearer, and then the VoIP dedicated bearer can be utilized to receive and transmit the VoIP session data packet.
  • this embodiment can implement that the UE switches from the CS domain to the PS domain, and in the CS to PS handover process, the target mobility management entity triggers the establishment of the UE between the SGW and the MGW or between the SGW and the PGW.
  • the VoIP dedicated bearer can be used to quickly map the voice service in the CS domain to the VoIP session of the target network after the UE switches to the target network, and use the established VoIP dedicated bearer to carry its VoIP data stream, which is beneficial to maintaining the UE domain. Switching voice continuity.
  • the method may include: receiving, by the first UE, a handover command sent by a source access network (for example, an RNC), where The handover command carries the handover resource information prepared by the target access network for the first UE; accesses the target access network; configures a VoIP session parameter on the VoIP dedicated bearer, so as to use the VoIP dedicated bearer to carry the first UE and the MGW. VoIP session.
  • a source access network for example, an RNC
  • the first UE may perform parameter configuration by using a VoIP session parameter delivered by the MME (for example, using NAS signaling, a handover command); or, using a local default VoIP session parameter for parameter configuration.
  • a VoIP session parameter delivered by the MME for example, using NAS signaling, a handover command
  • a local default VoIP session parameter for parameter configuration for example, using a VoIP session parameter delivered by the MME
  • the first UE may also initiate an IMS session domain translation.
  • Embodiment 2
  • the MME triggers the establishment of a VoIP dedicated bearer between the UE-1, the eNB, the SGW, and the MGW, and the MGW, and the MGW forwards the uplink and downlink VoIP data packets of the UE-1.
  • the specific may include:
  • the UE-1 performs a CS voice call.
  • the RNS/BSS initiates a handover process, and sends a CS to PS handover request message corresponding to the UE-1 to the visited MSC.
  • the visiting MSC is a MSC closer to the target network (LTE network), visiting the MSC and
  • the serving MSC of UE-1 may be the same MSC or a different MSC.
  • Visit MSC supports Reverse Single Voice Voice Call Continuity (SRVCC). If the visited MSC is not the current serving MSC of the UE-1, the visited MSC may initiate the CS-to-PS handover of the UE-1 according to different policies. Alternatively, the serving MSC of the UE may also initiate the corresponding UE-1. CS to PS switch.
  • SRVCC Reverse Single Voice Voice Call Continuity
  • the serving MSC needs to support the reverse SRVCC.
  • the service of the UE-1 may include: the visited MSC sends a MAP_SUB_HANDOVER message to the serving MSC of the UE-1; the serving MSC of the UE-1 further initiates a CS to PS handover procedure to the MME.
  • the CS to PS handover corresponding to UE-1 is initiated by the visited MSC (hereinafter referred to as MSC) as an example. It can be understood that if the calling MSC directly initiates the CS to PS handover to the MME, the upgrade of the serving MSC can be avoided, and only the MSC adjacent to the LTE needs to be upgraded, which is advantageous for cost saving.
  • the MSC sends a CS to PS handover request message corresponding to the UE-1 to the MME.
  • the CS to PS handover request message corresponding to the UE-1 sent by the MSC to the MME may carry one or more of the following information: CKCS and IKCS of the CS domain, KSIMSC, address, port of the MGW, and the UE are in the UE.
  • Information such as CodeC used by PS.
  • the CodeC used by the UE-1 in the PS may select a common CodeC in the CodeC of the PS domain supported by the UE-1 and the CodeC supported by the MGW, and the CodeC may be in the Attach process, the Setup process, or the LAU of the UE-1. The process is reported to the MSC.
  • the MME receives a CS to PS handover request message of the corresponding UE-1 from the MSC.
  • the MME sends a create session request message to the SGW, where the address information of the MGW is carried, and the international mobile subscriber identity (IMSI, International Mobile Subscriber) is also carried.
  • IMSI international mobile subscriber identity
  • MSISDN Mobile Station International ISDN Number
  • MSISDN Mobile Station International ISDN Number
  • the Create Session Request message sent by the MME to the SGW carries a specific APN, and the specific APN is associated with the MGW (ie, points to the MGW), and the APN can be configured by the operator.
  • the MME may first initiate a location update procedure to the HSS to determine whether the UE-1 has subscription information on the LTE network, and if yes, The triggering establishes a default bearer between the SGW and the MGW; if not, the handover process can be terminated.
  • the SGW sends a create session request message to the MGW, and instructs the MGW to establish a default bearer corresponding to the UE-1 between the SGW and the SGW.
  • the create session request message sent by the SGW to the MGW may carry a specific APN.
  • the MGW receives the create session request message from the SGW, establishes a default bearer corresponding to the UE-1 between the SGW and the MGW, and sends a create session response message to the SGW.
  • the quality of service (QoS) of the default bearer can be generated on the MGW or based on its configuration, or obtained through interaction with the PCRF entity (the MSC/MGW and PCRF existing interfaces).
  • Another bearer corresponding to the UE-1 between the MGW and the SGW may be further established, for example, a VoIP that can be used to carry the VoIP session of the UE-1 can be created.
  • Dedicated bearer may be further established.
  • the SGW sends a create session response message to the MME, indicating that the default bearer setup of the corresponding UE-1 between the MGW and the SGW is completed.
  • the MGW sends a create bearer request message to the SGW, and indicates to establish a VOIP dedicated bearer corresponding to the UE-1 between the MGW and the SGW.
  • Step 208 and step 206 can be performed at the same time, that is, the MGW can establish a VOIP dedicated bearer corresponding to the UE-1 between the MGW and the SGW while establishing the default bearer of the UE-1.
  • the QoS for establishing a VoIP dedicated bearer may be generated on the MGW or based on its configuration, or obtained by interacting with the PCRF entity.
  • the SGW sends a create 7-stop request message to the MME, and indicates to the MME that the VOIP-specific bearer setup of the UE-1 is completed between the MGW and the SGW, and instructs the MME to trigger the establishment of the VOIP-specific 7-bit corresponding to the UE-1 between the SGW and the eNB. ;
  • the MME may be instructed to complete the establishment of the VOIP dedicated bearer corresponding to the UE-1 between the MGW and the SGW.
  • the MME may also trigger the establishment of a VOIP bearer corresponding to the UE-1 between the MGW and the SGW. For example, the MME sends a bearer resource command message to the SGW, and the SGW sends a bearer resource command message to the MGW, indicating that the MGW and the SGW are established.
  • the MME sends a bearer resource command message to the SGW, and the SGW sends a bearer resource command message to the MGW, indicating that the MGW and the SGW are established.
  • the VOIP bearer of UE-1 corresponds to the VOIP bearer of UE-1;
  • the MGW sends a create bearer request to the SGW, and the SGW sends a create bearer request to the MME, and the MME sends an MME.
  • a create bearer response is sent to the SGW, and the SGW sends a create bearer response to the MGW.
  • the MME initiates a handover request procedure to the eNB, and sends a handover request message corresponding to the UE-1 to the eNB, instructing the eNB to prepare a handover resource for the UE, and instructing the eNB to establish a VOIP dedicated bearer corresponding to the UE-1 between the eNB and the SGW, so as to facilitate Temporarily bear UE- 1 VOIP session in LTE.
  • the MME may generate a NONCE parameter (the parameter may derive an LTE key), and may select the CS key as the root key of the LTE key deduction, and derive LTE.
  • the key may further notify the UE-1 to perform the LTE key derivation by using the CS key.
  • the KSIMSC may be used in the handover command to instruct the UE-1 to perform the LTE key deduction using the CS key, or the LTE key may be directly used. Notify UE-1.
  • the UE-1 may be allowed to access; if the eNB determines that the resource is insufficient, the UE-1 may be denied access. This embodiment is described by taking an example in which the eNB determines that the resources are sufficient.
  • the handover resources prepared by the eNB correspond to default bearers and dedicated bearers established by the SGW and the MGW.
  • the MME sends a CS-1 PS to PS handover response message of the UE-1 to the MSC.
  • steps 201 to 211 describe the CS to PS handover preparation phase of UE-1.
  • the CS to PS handover execution phase of UE-1 is described below.
  • the MSC receives the CS to PS handover response message of the UE from the MME, and sends a CS to PS handover command to the UE by using the RNC, and indicates that the UE-1 accesses the eNB.
  • the handover command may carry the eNB to prepare for the UE-1. Switch resources and so on.
  • the UE receives the handover command, and accesses the eNB.
  • the UE may further send a handover complete message to the eNB.
  • the eNB receives the handover complete message from the UE, and may further send a handover complete message to the MME, to notify the MME that the UE-1 handover is complete.
  • the LTE network and UE-1 can synchronize VoIP session parameters in a variety of ways.
  • One of the following manners may be: one or more of the following parameters are sent by the MME to the UE-1: the IP address of the UE-1, the special APN, the TFT, the bearer identifier, the codec format, the packetization interval, and the RTP payload type. , MGW address, port and other parameters.
  • the IP address, the TFT, the codec format, the packetization interval, the RTP payload type, the MGW address, the port, and the like of the UE-1 may be generated by the MGW, and may be delivered to the MME in steps 206-208, or may also be performed in step 203. Passed to the MME; the special APN and bearer identity may be generated by the MME.
  • the MME may send a non-access stratum (NAS, Non-Access Statun) message to the UE-1, and carry the VoIP session reference in the NAS message.
  • the VoIP session parameter is notified to the UE-1, and the UE-1 obtains the VoIP session parameter by receiving the NAS message, and configures the VOIP dedicated bearer.
  • the MME may also carry the VoIP session in the handover request sent to the eNB.
  • the parameter is encapsulated in the container by the eNB and sent to the RNS/BSS, and the RNS/BSS can carry it to the UE-1 in the handover command, and the UE-1 synchronizes the VoIP session parameters with the LTE network, and configures the VOIP-specific parameter. Hosted.
  • Mode 2 may be: UE-1 and MGW each configure a VoIP dedicated bearer using default VoIP session parameters. For example, UE-1 uses a private address and port to carry the VOIP stream, and the MGW uses another private address and port to carry the VOIP stream. UE-1 generates a TFT based on these addresses and ports.
  • the RTP payload type can also be set according to the default value.
  • the codec format can use AMR (variable multi-rate voice format), and the packing interval and other parameters also use the default value.
  • the reason why the default IP and port can be used is because the MGW can distinguish which UE the VOIP stream is from according to the GTP bearer, instead of according to the IP address and port of the VOIP stream, that is, if multiple UEs Using the same IP address and port, the MGW can also be distinguished according to the GTP bearer.
  • the UE-1 receives the VoIP session parameters sent by the MME, locally create configuration parameters such as an APN, an IP address, a port, and a TFT, and may further respond to the MME.
  • configuration parameters such as an APN, an IP address, a port, and a TFT
  • the UE-1 can receive and send the VOIP data stream. Further, if the UE-1 is not attached to the EPC, the MME may send a location update request message to the HSS to initiate a location update, from the HSS. Obtain relevant subscription data of UE-1; or, an attach process may be performed by UE-1 to complete acquisition of related subscription data.
  • the MME After receiving the handover completion notification from the eNB, the MME sends an update bearer request message to the SGW, where the update bearer request message may carry a user plane address of the eNB.
  • the SGW receives an update bearer request message from the MME, and sends an update bearer request message to the MGW.
  • the MGW and the SGW update the bearer.
  • the transmission path of the VoIP uplink data of UE-1 is UE-1 ->eNB ->SGW ->MGW; the transmission path of VoIP downlink data of UE-1 is MGW ->SGW ->eNB -> UE-1
  • the MME may further trigger the establishment of the SGW and the triggering of the VoIP dedicated bearer corresponding to the UE-1 between the SGW and the MGW.
  • the MGW corresponds to the UE-1 video dedicated bearer, where the video dedicated bearer is used to carry the video session between the UE-1 and the MGW after accessing the target access network.
  • the establishment of a video-specific bearer is similar to the establishment of a VoIP-specific bearer.
  • the UE-1 If the UE-1 has not been registered in the IMS before, the UE-1 initiates an IMS registration with the IMS, and initiates a domain conversion process.
  • the UE-1 After the domain conversion is completed, the UE-1 establishes a new bearer in the LTE network.
  • the transmission path of VoIP uplink data of UE-1 is UE-1 -> eNB -> SGW -> PGW;
  • the VoIP downlink data transmission path of UE-1 is PGW -> SGW -> eNB -> UE-1;
  • the IMS may instruct the MSC/MGW to release the corresponding session of the UE.
  • the MSC/MGW sends a delete bearer request to the SGW, initiates the bearer release, triggers the default bearer corresponding to the UE-1 between the SGW and the MGW established before the release domain conversion, and the VOIP corresponding to the UE-1 between the SGW and the MGW, the SGW, and the eNB.
  • the dedicated bearer of course, the MSC/MGW can also release other sessions of the UE-1 in the CS domain.
  • the MSC may also send a delete message to the MME, and the MME triggers deletion of the default bearer and the VoIP dedicated bearer on the SGW, the MGW, and the ENB.
  • the SGW sends a delete bearer request to the MME, where the MME is configured to trigger the deletion of the VoIP dedicated bearer corresponding to the UE-1 between the SGW and the eNB established before the domain switch is deleted.
  • the MME sends a delete bearer command to the eNB, instructing the eNB to delete the VoIP dedicated bearer corresponding to the UE-1 between the SGW and the eNB established before the domain switch.
  • the eNB receives the delete bearer command from the MME, deletes the corresponding bearer established before the UE-1 domain transition, and performs RRC connection reconfiguration on the eNB and the UE-1.
  • the eNB sends a bearer release response to the MME.
  • steps 214 and 216 may be performed at any time between steps 213 and 218; step 215 may be performed at any time between steps 213 and 218, or after step 203.
  • UE-1 may initiate a PDN connection release procedure to the MME; the MME initiates bearer deletion, and the MGW notifies the MSC to release the peer's session; UE-1 and MME deactivate the bearer.
  • Solution 1 the MG notifies the MGW to release the session, and the MGW acts as the PGW to initiate the bearer release;
  • Solution 2 The MME notifies the MME to release the session, and the MME initiates the release of the bearer.
  • the UE can be switched from the CS domain to the PS domain, and in the CS to PS handover process, the MME triggers establishment of a VoIP dedicated bearer corresponding to the UE between the SGW and the MGW, and thus can be switched at the UE.
  • the voice service in the CS domain is quickly mapped to the VoIP session of the target network, and the established VoIP dedicated bearer is used to carry its VoIP data stream, which is beneficial to maintain the voice continuity of the UE domain handover.
  • the UE further performs IMS domain conversion, which can simplify the bearer mode of the VoIP data while maintaining the voice continuity of the UE domain switching.
  • the MME triggers the establishment of a VoIP dedicated bearer between the UE-1, the eNB, the SGW, and the PGW, and the PGW exchange the uplink and downlink VoIP data packets of the UE-1.
  • the specific may include:
  • the UE performs a CS voice call.
  • the RNS/BSS initiates a handover process, and sends a CS to PS handover request message to the MSC.
  • the visited MSC is an MSC that is closer to the target network (LTE network), and the serving MSC that visits the MSC and the UE-1 may be the same MSC. It may also be a different MSC.
  • Visit MSC to support reverse SRVCC If the visited MSC is not the current serving MSC of the UE-1, the visited MSC may initiate the CS to PS handover of the UE-1 according to different policies. Alternatively, the serving MSC of the UE may also initiate the CS to PS handover of the corresponding UE-1. .
  • the serving MSC needs to support the reverse SRVCC.
  • the service of the UE-1 may include: the visited MSC sends a MAP_SUB_HANDOVER message to the serving MSC of the UE-1; the serving MSC of the UE-1 further initiates a CS to PS handover procedure to the MME.
  • the CS to PS handover corresponding to UE-1 is initiated by the visited MSC (hereinafter referred to as MSC) as an example.
  • the MSC sends a CS-1 PS to PS handover request of the UE-1 to the MME.
  • the CS to PS handover request of the UE sent by the MSC to the MME may be carried.
  • the CodeC used by the UE-1 in the PS may select a common CodeC in the CodeC of the PS domain supported by the UE-1 and the CodeC supported by the MGW, and the CodeC may be in the Attach process, the Setup process, or the LAU of the UE-1. The process is reported to the MSC.
  • the MME receives a CS to PS handover request message from the corresponding UE-1 of the MSC.
  • the MME sends a create session request message to the SGW, which triggers the establishment of a default bearer corresponding to the UE-1 between the SGW and the PGW.
  • a default bearer corresponding to the UE-1 between the SGW and the PGW.
  • the create session request message sent by the MME to the SGW may carry a specific APN, and the APN may be configured by the operator.
  • the MME may first initiate a location update procedure to the HSS to determine whether the UE-1 has subscription information on the LTE network, and if so, trigger the establishment of the SGW.
  • the QoS parameters for establishing the default bearer described above may be generated on the MME or based on its configuration.
  • the SGW sends a create session request to the PGW, and instructs the PGW to establish a default bearer corresponding to the UE-1 between the SGW and the SGW.
  • the create session request message sent by the SGW to the PGW may carry the specific APN.
  • the PGW receives a create session request message from the SGW, establishes a default bearer corresponding to the UE-1 between the SGW and the PGW, and sends a create session response message to the SGW.
  • Another bearer corresponding to the UE-1 between the PGW and the SGW may be further established, for example, a VoIP that can be used to carry the VoIP session of the UE-1 can be created.
  • Dedicated bearer may be further established, for example, a VoIP that can be used to carry the VoIP session of the UE-1 can be created.
  • the SGi interface can be provided between the MGW and the PGW, and the uplink and downlink data of the UE can be forwarded by the IP data packet in the manner between the MGW and the PGW.
  • a VOIP session flow between UE-1 and MGW can be transmitted by establishing a virtual private network (VPN) tunnel between the MGW and the PGW.
  • VPN virtual private network
  • the SGW receives the create session response message from the PGW, and sends a create session response message to the MME, indicating that the default bearer setup of the corresponding UE-1 between the PGW and the SGW is completed.
  • the MME sends a bearer resource command message to the SGW, and triggers the SGW to send the bearer resource to the PGW.
  • the source command message triggers establishment of a VOIP dedicated bearer corresponding to the UE-1 between the PGW and the SGW;
  • the SGW sends a bearer resource command message to the PGW, and establishes a VOIP dedicated bearer corresponding to the UE-1 between the PGW and the SGW.
  • the PGW receives the bearer resource command message from the SGW, and sends a create bearer request message to the SGW, instructing the SGW to establish a VOIP dedicated bearer corresponding to the UE-1 between the PGW and the SGW;
  • the QoS for establishing a default bearer can be generated on the PGW or based on its configuration or through interaction with the PCRF entity.
  • the SGW sends a create bearer request message to the MME, and indicates to the MME that the VOIP dedicated bearer setup of the UE-1 is completed between the MGW and the SGW, and instructs the MME to trigger the establishment of the VOIP-specific 7-load corresponding to the UE-1 between the SGW and the eNB.
  • the MME sends a handover request message corresponding to the UE-1 to the eNB, instructing the eNB to prepare a handover resource for the UE, and instructing the eNB to establish a VOIP dedicated bearer corresponding to the UE-1 between the eNB and the SGW, so as to facilitate the temporary bearer UE-1 in the LTE.
  • VOIP session
  • the MME may generate a NONCE parameter, and may select the CS key as the root key of the LTE key derivation, and derive the LTE key, and may further notify the UE- 1 Using the CS key for LTE key derivation, for example, KSIMSC may be used in the handover command to instruct UE-1 to perform LTE key deduction using the CS key, or directly notify the UE-1 of the LTE key.
  • KSIMSC may be used in the handover command to instruct UE-1 to perform LTE key deduction using the CS key, or directly notify the UE-1 of the LTE key.
  • the UE-1 may be allowed to access; if the eNB determines that the resource is insufficient, the UE-1 may be denied access. This embodiment is described by taking an example in which the eNB determines that the resources are sufficient.
  • the MME sends a CS-to-PS handover response message of the UE-1 to the MSC, where the information about the IP address/port allocated by the PGW to the UE-1, and the handover resource information prepared by the eNB for the UE-1 may be carried.
  • steps 301 ⁇ 313 describe the CS to PS handover preparation phase of the UE, and the following describes the CS to PS handover execution phase of the UE.
  • the MSC receives the CS to PS handover response message of the UE-1 from the MME, and sends a CS to PS handover command to the UE-1 through the RNC, instructing the UE-1 to access the eNB.
  • the handover command carries the handover resource information prepared by the eNB for the UE-1.
  • the UE-1 receives the handover command and accesses the eNB.
  • the UE-1 may further send a handover complete message to the eNB.
  • the eNB receives the handover complete message from the UE-1, and may further send a handover complete message to the MME to notify the MME.
  • UE-1 handover is completed;
  • the LTE network and UE-1 can synchronize VoIP session parameters in a variety of ways.
  • One of the following manners may be: one or more of the following parameters are sent by the MME to the UE-1: the IP address of the UE-1, the special APN, the TFT, the bearer identifier, the codec format, the packetization interval, and the RTP payload type. , MGW address, port and other parameters.
  • the IP address, the TFT, the codec format, the packetization interval, the RTP payload type, the MGW address, and the port of the UE-1 may be generated by the MGW, and may be delivered to the MME in multiple manners, for example, may be delivered in step 303.
  • the MME; the special APN and the bearer identity may be generated by the MME.
  • the MME may send a non-access stratum (NAS, Non-Access Statun) message to the UE-1, and carry the VoIP session parameter in the NAS message.
  • the VoIP session parameter is notified to the UE-1, and the UE-1 learns the VoIP session parameter by receiving the NAS message, and configures the VoIP dedicated bearer.
  • the MME may also carry the VoIP session parameter in the handover request sent to the eNB.
  • the eNB is encapsulated in the container and sent to the RNS/BSS, and the RNS/BSS can carry it to the UE-1 in the handover command.
  • the UE-1 synchronizes the VoIP session parameters with the LTE network and configures the VoIP dedicated bearer.
  • Mode 2 may be: UE-1 and MGW each configure a VoIP dedicated bearer using default VoIP session parameters. For example, UE-1 uses a private address and port to carry the VOIP stream, and the MGW uses another private address and port to carry the VOIP stream. UE-1 generates a TFT based on these addresses and ports.
  • the RTP payload type can also be set according to the default value.
  • the codec format can use AMR (variable multi-rate voice format), and the packing interval and other parameters also use the default value.
  • the UE-1 receives the VoIP session parameters sent by the MME, locally create configuration parameters such as an APN, an IP address, a port, and a TFT, and may further respond to the MME.
  • the UE can receive and send the VOIP data stream;
  • the UE-1 can configure the VoIP dedicated configuration locally using the default parameters.
  • the MME may send a location update request message to the HSS, initiate a location update, and obtain related subscription data of the UE-1 from the HSS; or, may perform an attach by the UE-1. The process to complete the acquisition of relevant contract data.
  • the MME After receiving the handover complete message from the eNB, the MME sends an update bearer request message to the SGW, where the update bearer request message may carry user plane address information of the eNB.
  • the SGW receives an update bearer request message from the MME, and sends an update bearer request message to the PGW.
  • the PGW and the SGW update the bearer.
  • the transmission path of the VoIP uplink data of the UE-1 is UE-1 -> eNB -> SGW -> PGW - >MGW;
  • the transmission path of the VoIP downlink data of the UE-1 is MGW -> PGW -> SGW -> eNB - >UE-1;
  • the PGW and the MGW may also consider establishing a VPN tunnel to ensure that the PGW and the MGW can smoothly forward the uplink and downlink data of the UE-1.
  • the MME may also trigger the establishment of the VoIP dedicated bearer corresponding to the UE-1 between the SGW and the PGW, and further trigger the establishment of the SGW and the PGW.
  • the video dedicated bearer corresponding to the UE-1 wherein the video dedicated bearer is used to carry the video session between the UE-1 and the MGW after accessing the target access network.
  • the establishment of video-specific bearers is similar to the way VoIP-specific bearers are established.
  • the voice part of the UE-1 in the video call of the source network may be mapped to the target network.
  • the VoIP dedicated bearer may be established, but the video dedicated bearer may not be established.
  • the UE-1 If the UE-1 has not been registered in the IMS before, the UE-1 initiates an IMS registration with the IMS, and initiates a domain conversion process.
  • the UE-1 After the domain conversion is completed, the UE-1 establishes a new bearer in the LTE network.
  • the transmission path of VoIP uplink data of UE-1 is UE-1 -> eNB -> SGW -> PGW;
  • the VoIP downlink data transmission path of UE-1 is PGW -> SGW -> eNB -> UE-1;
  • the IMS may further instruct the MSC/MGW to release the corresponding session of the UE-1; and may further instruct the MME to initiate the temporary session release by using the MSC;
  • the MSC/MGW releases the UE-1 session in the CS domain, sends a delete bearer request to the MME, initiates the bearer release, and triggers the release of the VOIP corresponding to the UE-1 between the SGW and the inter-eNB, and between the SGW and the PGW.
  • the MME receives the delete bearer request from the MSC/MGW, sends a delete bearer to the SGW, and sends a delete bearer command to release the corresponding bearer.
  • the MME sends a delete bearer command to the eNB, instructing the eNB to delete the VoIP dedicated bearer corresponding to the UE-1 between the SGW and the eNB established before the domain switch.
  • the eNB receives the delete bearer command from the MME, and deletes the corresponding bearer established before the UE-1 domain transition, and the eNB and the UE-1 perform RRC connection reconfiguration. 326. The eNB sends a bearer release response to the MME.
  • steps 315 and 318 may be performed at any time between steps 313 and 320; step 316 may be performed at any time between steps 314 and 320, or after step 303.
  • the UE can be switched from the CS domain to the PS domain, and in the CS to PS handover process, the MME triggers establishment of a VoIP dedicated bearer corresponding to the UE between the SGW and the PGW, and thus can be switched at the UE.
  • the voice service in the CS domain is quickly mapped to the VoIP session of the target network, and the established VoIP dedicated bearer is used to carry its VoIP data stream, which is beneficial to maintain the voice continuity of the UE domain handover.
  • the UE further performs IMS domain conversion, which can simplify the bearer mode of the VoIP data while maintaining the voice continuity of the UE domain switching.
  • An embodiment of a method for switching a circuit switched domain to a packet switched domain is described in the following, and may include: the target mobility management entity receives the MSC from the MSC. a CS to PS handover request message corresponding to the first UE, and a PS handover request message corresponding to the first UE from the SGSN; sending a handover request message to the target access network, indicating that the target access network prepares for the first UE to correspond to the SGSN a handover resource of the PS handover request message; sending a CS to PS handover response message corresponding to the first UE to the MSC, and transmitting a PS handover response message corresponding to the first UE to the SGSN, where the CS to PS handover response message carries the target access
  • the network is a handover resource prepared by the first UE.
  • the VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW is triggered to be established, or the VoIP dedicated to the first UE between the SGW and the PGW is triggered. Carrying, so that the first UE uses the VoIP dedicated bearer to carry the first UE and the MGW after switching to the target access network. VoIP session.
  • the technical solution of the present embodiment is mainly directed to a scenario in which a first UE has a PS service on a 2G/3G network before the handover. After the first UE handover is completed, the target mobility management entity triggers the establishment of a VoIP dedicated bearer. Referring to FIG. 4, the specific process is performed.
  • Can include:
  • the target mobility management entity receives a CS to PS handover request message from a corresponding first UE of the MSC, and a PS handover request message corresponding to the first UE from the SGSN.
  • the target mobility management entity in this embodiment may be, for example, an MME corresponding to the LTE network, or an SGSN corresponding to the HSPA network, and may be other types of PS domain networks.
  • the network entity responsible for the mobility management function; the foregoing MSC may be a visited MSC (for example, an MSC that is closer to the target network), or may be a serving MSC of the first UE; the SGSN is an SGSN in the 2G/3G network.
  • the CS-to-PS handover request message of the first UE may carry the address information of the MGW, and may of course carry other related information.
  • the target mobility management entity sends a handover request message to the target access network, and instructs the target access network to prepare a handover resource corresponding to the PS handover request message from the SGSN for the first UE.
  • the target access network may correspond to an eNB in an LTE network, or an RNC in the HSPA network, or an access network device corresponding to another PS network.
  • the target access network prepares a handover resource corresponding to the PS handover request message from the SGSN, so as to switch the PS service of the first UE in the 2G/3G network to the target network.
  • the target mobility management entity sends a CS to PS handover response message corresponding to the first UE to the MSC, and sends a PS handover response message corresponding to the first UE to the SGSN, where the CS to PS handover response message carries the target access network.
  • a handover resource prepared for the first UE, so that the MSC and/or the SGSN instruct the UE to access the target access network;
  • the PS handover response message corresponding to the first UE may be sent to the MSC, for example, the handover resource prepared by the target access network for the first UE, the address of the first UE, and the like (the address may be the default). IP address).
  • the MSC and the SGSN may send a handover command to the first UE by using the RNC, and indicate that the first UE accesses the target access network, where the handover command may carry the target access network.
  • Information such as handover resources prepared for the first UE.
  • the target mobility management entity triggers establishment of an Internet Protocol Voice VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW, or triggers establishment of a VoIP dedicated communication between the SGW and the PGW corresponding to the first UE.
  • the bearer is used to enable the first UE to use the VoIP dedicated bearer to carry the VoIP session between the first UE and the MGW after switching to the target access network.
  • the first UE may configure the VoIP session parameters for the VoIP dedicated bearer, and then use the VoIP dedicated bearer to receive and send the VoIP session data packet.
  • the MME may further trigger when the VoIP dedicated bearer corresponding to the first UE is triggered between the establishment of the SGW and the MGW.
  • Establishing a video dedicated bearer corresponding to the first UE between the SGW and the MGW, or triggering establishment of a video dedicated bearer corresponding to the first UE between the SGW and the PGW when triggering the establishment of the VoIP dedicated bearer corresponding to the first UE between the SGW and the PGW The video dedicated bearer is used to carry a video session between the first UE and the MGW after accessing the target access network.
  • the establishment of a video-specific bearer is similar to the establishment of a VoIP-specific bearer.
  • the voice part of the video call of the first UE in the source network may be mapped to the target network.
  • only the VoIP dedicated 7-carrier may be established, and the video-specific 7-carrier may not be established.
  • this embodiment can implement that the UE switches from the CS domain to the PS domain, and after the CS to PS handover is completed, the target mobility management entity triggers establishment of the VoIP corresponding to the UE between the SGW and the MGW or the SGW and the PGW.
  • the dedicated bearer can be used to quickly map the voice service in the CS domain to the VoIP session of the target network after the UE switches to the target network, and use the established VoIP dedicated bearer to carry its VoIP data stream, which is beneficial to maintain the UE domain handover. Voice continuity.
  • the following is another embodiment of the method for switching a circuit switched domain to a packet switched domain according to an embodiment of the present invention, which may include: receiving, by a first UE, a handover command sent by a source access network, the handover command Carrying the handover resource information prepared by the target access network for the first UE; accessing the target access network; after the first UE handover is completed, triggering establishment of the Internet Protocol voice VoIP corresponding to the first UE between the serving gateway SGW and the media gateway MGW Dedicated bearer, or triggering establishment of a VoIP dedicated bearer corresponding to the first UE between the SGW and the packet data gateway PGW; configuring a VoIP session parameter of the VoIP dedicated bearer of the first UE, so as to use the VoIP dedicated bearer to carry the first UE and the MGW Between VoIP sessions.
  • the technical solution of the present embodiment is mainly directed to a scenario in which a first UE has a PS service on a 2G/3G network before the handover. After the first UE handover is completed, the target mobility management entity triggers the establishment of a VoIP dedicated bearer. See FIG. 5, the specific process. Can include:
  • the first UE receives a handover command that is sent by the source access network, where the handover command carries the handover resource information prepared by the target access network for the first UE.
  • the source access network here is, for example, an RNC in 2G/3G; the target access network may correspond to an eNB in an LTE network, or an RNC corresponding to an HSPA network, or an access network device corresponding to another PS network. .
  • the first UE accesses the target access network. 530. After the handover is completed, the first UE triggers establishment of an inter-network protocol voice VoIP dedicated bearer corresponding to the first UE between the serving gateway SGW and the media gateway MGW, or triggers establishment of a VoIP corresponding to the first UE between the SGW and the packet data gateway PGW.
  • Dedicated bearer corresponding to the first UE between the serving gateway SGW and the media gateway MGW, or triggers establishment of a VoIP corresponding to the first UE between the SGW and the packet data gateway PGW.
  • the first UE configures a VoIP session parameter of the VoIP dedicated bearer to use the VoIP dedicated bearer to carry a VoIP session between the first UE and the MGW.
  • the MME may further trigger the establishment of the SGW and the MGW when triggering the establishment of the VoIP dedicated bearer of the first UE between the SGW and the MGW.
  • the video-specific bearer of the first UE or the triggering of the establishment of the VoIP-dedicated bearer corresponding to the first UE between the SGW and the PGW, further triggering the establishment of a video-specific bearer corresponding to the first UE between the SGW and the PGW, where the video The dedicated bearer is used to carry the video session between the first UE and the MGW after accessing the target access network.
  • the way in which video-specific bearers are set up is similar to the way VoIP-specific bearers are built.
  • the voice part of the video call of the first UE in the source network may be mapped to the target network.
  • only the VoIP dedicated 7-carrier may be established, and the video-specific 7-carrier may not be established.
  • the UE can be switched from the CS domain to the PS domain, and after the CS to PS handover is completed, the UE triggers the establishment of the VoIP dedicated bearer corresponding to the UE between the SGW and the MGW or the SGW and the PGW.
  • the voice service in the CS domain is quickly mapped to the VoIP session of the target network, and the established VoIP dedicated bearer is used to carry the VoIP data stream, which is beneficial to maintain the voice continuity of the UE domain handover. .
  • This embodiment is directed to the scenario where the UE also has a PS service in the 2G/3G network.
  • the default bearer and the VoIP dedicated bearer may not be established in the target network (LTE or HSPA), and the VoIP is initiated by the UE or the MME after the handover is completed. Establishment/modification of dedicated bearers.
  • the specifics may include:
  • the UE performs a CS voice call.
  • the RNS/BSS initiates a handover process, sends a CS to PS handover request message to the visited MSC, and sends a PS handover request message to the SGSN.
  • the serving MSCs visiting the MSC and the UE-1 may be the same MSC or different MSCs. Visiting MSC supports reverse SRVCC. If the visited MSC is not the current serving MSC of UE-1, then The visited MSC may initiate the CS-to-PS handover of the UE-1 according to different policies; or the CS-to-PS handover of the corresponding UE-1 may be initiated by the serving MSC of the UE.
  • the serving MSC needs to support the reverse SRVCC.
  • the service of the UE-1 may include: the visited MSC sends a MAP_SUB_HANDOVER message to the serving MSC of the UE-1; the serving MSC of the UE-1 further initiates a CS to PS handover procedure to the MME.
  • the CS to PS handover corresponding to UE-1 is initiated by the visited MSC (hereinafter referred to as MSC) as an example.
  • the MSC sends a CS to PS handover request message corresponding to the UE-1 to the MME.
  • the SGSN sends a PS handover request message corresponding to the UE-1 to the MME.
  • the CS to PS handover request message corresponding to the UE-1 sent by the MSC to the MME may carry one or more of the following information: CKCS and IKCS of the CS domain, KSIMSC, address, port of the MGW, and the UE are in the UE.
  • Information such as CodeC used by PS.
  • the CodeC used by the UE-1 in the PS may select a common CodeC in the CodeC of the PS domain supported by the UE-1 and the CodeC supported by the MGW, and the CodeC may be in the Attach process, the Setup process, or the LAU of the UE-1. The process is reported to the MSC.
  • the MME receives the CS to PS handover request of the UE-1 sent by the MSC, and the PS handover request of the UE-1 sent by the SGSN.
  • the MME initiates a handover request procedure to the eNB, and sends a corresponding handover request message to the eNB, indicating that the eNB is the UE- 1 preparing a handover resource of a handover request message of the UE sent by the SGSN;
  • the MME only instructs the eNB to prepare the switching resource of the handover request message of the UE sent by the SGSN for the UE-1, so as to switch the PS service in the 2G/3G network first.
  • the MME may generate the NONCE parameter, and may select the CS key as the root key of the LTE key derivation, and derive the LTE key, and further notify the UE to utilize
  • the CS key performs LTE key deduction.
  • KSIMSC can be used in the handover command to instruct the UE to perform LTE key deduction using the CS key.
  • the MME may first initiate a location update procedure to the HSS to determine whether the UE-1 is in the LTE network. There is subscription information, if any, then trigger the establishment of the default bearer between the SGW and the MGW; if not, the handover process can be terminated. 605.
  • the MME sends a CS to PS handover response message corresponding to the UE-1 to the MSC, and the MME sends a PS handover response message to the SGSN.
  • the PS handover response message carries the handover resource information prepared by the eNB for the UE-1, and may also carry the address information of the UE-1.
  • the UE-1 has a PS service before the handover, and the SGSN and the SGW/PGW have established a PDN connection.
  • the MME, the SGW, and the MGW do not initiate the establishment of a default bearer and a VoIP dedicated bearer.
  • the CS to PS handover response message may further include an IP address/port allocated by the PGW to the UE-1.
  • steps 601 ⁇ 605 introduce the CS to PS handover preparation phase of UE-1, and the following describes the CS to PS handover execution phase of UE-1.
  • the MSC receives the CS to PS handover response message of the UE-1 from the MME, and sends a CS to PS handover command to the UE-1 through the RNC, instructing the UE-1 to access the eNB.
  • the SGSN receives the PS handover response message of the UE-1 from the MME, and can send a PS handover command to the UE through the RNC, instructing the UE-1 to access the eNB;
  • the RNC may combine the handover commands from the SGSN and the MSC, and send the merged handover command to the UE-1, where the eNB prepares the handover resource information for the UE-1.
  • the UE-1 receives the handover command and accesses the eNB.
  • the UE-1 may further send a handover complete message to the eNB.
  • the eNB receives the handover complete message from the UE-1, and may further send a handover complete message to the MME to the MME. Notifying UE-1 that the handover is completed;
  • the UE-1 or the MME triggers establishment of an eNB and an SGW, and a default bearer and a VoIP dedicated bearer corresponding to the UE-1 between the SGW and the MGW.
  • UE-1 initiates the establishment of a VoIP dedicated bearer or UE-1 initiates a bearer resource modification.
  • the network sends parameters such as MGW address, port, CodeC, or QoS to UE-1 through the handover command (eNB) or NAS signaling (MME).
  • eNB handover command
  • MME NAS signaling
  • UE-1 initiates the establishment of a VoIP dedicated bearer based on the above parameters.
  • UE-1 can also initiate the establishment of a VoIP dedicated bearer with default parameters.
  • the MME initiates the establishment of the VoIP dedicated bearer, after receiving the handover complete message, the MME initiates a bearer resource command procedure to trigger the establishment of the VoIP dedicated bearer. 609.
  • the LTE network and the UE can synchronize configuration parameters in multiple ways.
  • One of the following manners may be: one or more of the following parameters are sent by the MME to the UE-1: the IP address of the UE-1, the special APN, the TFT, the bearer identifier, the codec format, the packetization interval, and the RTP payload type. , MGW address, port and other parameters.
  • the MME may send a non-access stratum (NAS, Non-Access Statun) message to the UE-1, and carry the VoIP session parameter in the NAS message.
  • the VoIP session parameter is notified to the UE-1, and the UE-1 obtains the VoIP session parameter by receiving and parsing the NAS message, and performs configuration; or the MME may also carry the VoIP session parameter in the handover request sent to the eNB; It is sent to the RNS/BSS in the container, and the RNS/BSS can carry it to the UE-1 in the handover command, and the UE-1 synchronizes the VoIP session parameters with the LTE network.
  • NAS non-access stratum
  • Mode 2 may be: UE-1 and MGW each configure a VoIP dedicated bearer using default VoIP session parameters.
  • the address of UE-1 is fixed to use a private address and port to carry the VOIP stream
  • the address of the MGW is fixed to use another private address and port to carry the VOIP stream
  • UE-1 generates a TFT according to these addresses and ports.
  • the RTP payload type can also be set according to the default value.
  • the codec format can use AMR (variable multi-rate voice format), and the packing interval and other parameters also use the default value.
  • the UE-1 receives the VoIP session parameters sent by the MME, locally create configuration parameters such as an APN, an IP address, a port, and a TFT, and may further respond to the MME.
  • configuration parameters such as an APN, an IP address, a port, and a TFT
  • the UE can receive and send the VOIP data stream.
  • the MME does not deliver the VoIP session parameters to the UE-1
  • the UE-1 can use the default parameters for the local VoIP dedicated bearer configuration.
  • the MME may send a location update request message to the HSS, initiate a location update, and obtain related subscription data of the UE-1 from the HSS; or, may perform an attach by the UE-1. The process to complete the acquisition of relevant contract data.
  • the MME After receiving the handover completion notification, the MME sends an update bearer request message to the SGW, where the update bearer request message may carry a user plane address of the eNB.
  • the SGW receives an update bearer request message from the MME, and sends an update bearer request message to the MGW.
  • the MGW and the SGW update the bearer.
  • the transmission path of the VoIP uplink data of UE-1 is UE-1 ->eNB -> SGW - >MGW; the transmission path of VoIP downlink data of UE-1 is MGW -> SGW -> eNB ->UE-1; further, if the call of UE-1 on the source network (2G/3 G) is a video call, then The MME may further trigger the establishment of the corresponding UE-1 video dedicated bearer between the SGW and the MGW when the VoIP dedicated bearer corresponding to the UE-1 is triggered between the SGW and the MGW.
  • the video dedicated bearer is used to carry the UE-1 access.
  • the establishment of a video-specific bearer is similar to the establishment of a VoIP-specific bearer.
  • the voice part of the UE-1 in the video call of the source network may be mapped to the target network.
  • the VoIP dedicated bearer may be established, but the video dedicated bearer may not be established.
  • UE-1 If UE-1 has not been registered in the IMS before, UE-1 initiates IMS registration, and initiates an IMS domain conversion process.
  • the IMS may instruct the MSC/MGW to release the corresponding session of the UE.
  • the UE-1 After the domain conversion is completed, the UE-1 establishes a new bearer in the LTE network.
  • the transmission path of VoIP uplink data of UE-1 is UE-1 -> eNB -> SGW -> PGW;
  • the VoIP downlink data transmission path of UE-1 is PGW -> SGW -> eNB -> UE-1;
  • the MSC/MGW sends a delete bearer request to the SGW, initiates the bearer release, triggers the default bearer corresponding to the UE-1 between the SGW and the MGW established before the release domain transition, and the VOIP corresponding to the UE-1 between the SGW and the MGW, the SGW, and the eNB.
  • the dedicated bearer of course, the MSC/MGW can also release other sessions of the UE-1 in the CS domain.
  • the SGW sends a delete bearer request to the MME, instructing the MME to trigger the deletion of the VoIP dedicated bearer corresponding to the UE-1 between the SGW and the eNB established before the domain transition is deleted.
  • the MME sends a delete bearer command to the eNB, instructing the eNB to delete the VoIP dedicated bearer corresponding to the UE-1 between the SGW and the eNB established before the domain switch.
  • the eNB receives the delete bearer command from the MME, deletes the corresponding bearer established before the UE-1 domain transition, and the eNB and the UE-1 perform RRC connection reconfiguration.
  • the eNB sends a bearer release response to the MME.
  • this embodiment can implement the UE to switch from the CS domain to the PS domain, and after the CS to PS handover is completed, the UE or the MME triggers the establishment of the VoIP dedicated bearer corresponding to the UE between the SGW and the MGW or the SGW and the PGW.
  • the voice service in the CS domain is quickly mapped to the VoIP session of the target network, and the established VoIP dedicated bearer is used to carry the VoIP data stream, which is beneficial to maintain the voice continuity of the UE domain handover. Sex.
  • the UE may further perform IMS domain conversion, which can simplify the bearer mode of the VoIP data while maintaining the voice continuity of the UE domain handover.
  • a target mobility management entity for example, an MME or an SGSN
  • the target mobility management entity receives the mobile a CS to PS handover request message corresponding to the first user equipment UE of the switching center MSC, the CS to PS handover request message carrying the GTP-U tunnel prepared by the MGW for the VoIP dedicated bearer of the first UE (the GTP-U tunnel is configured by the IP address and The TEID identifier is sent to the target access network, where the handover request message carries the GTP-U tunnel prepared by the MGW for the VoIP dedicated bearer of the first UE, indicating that the target access network prepares the handover resource for the first UE, and triggers Establishing a VoIP dedicated bearer corresponding to the first UE between the target access network and the MGW; sending a CS to PS handover response message corresponding to the first UE to the MSC, where
  • Switching resources, and the target access network is a GTP-U tunnel prepared for the VoIP dedicated bearer of the first UE, so that the first UE is switched to the above target After the network, using the dedicated VoIP bearer to bear a VoIP session between the first UE and the aforementioned MGW.
  • the specific process can include:
  • the target mobility management entity receives a circuit switched domain CS to a packet switched domain PS handover request message from a corresponding first user equipment UE of the mobile switching center MSC.
  • the mobility management entity in this embodiment triggers the establishment of a General Packet Radio Service (GTP) tunnel between the eNB and the MGW, and uses it as the VoIP of the first UE.
  • GTP General Packet Radio Service
  • Dedicated bearer The GTP-U tunnel is identified by an IP address and a TEID (F-TEID).
  • the address of the MGW may be carried in the CS to PS handover request message of the first UE, and the MGW is the IP address and TEID of the GTP-U tunnel prepared by the VoIP dedicated bearer of the first UE, and may further carry other related information.
  • the target mobility management entity sends a handover request message to the target access network, where the handover request message carries the GTP-U tunnel prepared by the MGW for the VoIP dedicated bearer of the first UE, and indicates that the target access network prepares handover for the first UE. a resource, and triggering establishment of a VoIP dedicated bearer corresponding to the first UE between the target access network and the MGW;
  • the target mobility management entity sends a handover request message to the target access network, which may carry the IP address and TEID of the GTP-U of the MGW, and trigger the establishment of the VoIP corresponding to the first UE between the target access network and the MGW.
  • the dedicated bearer the target access network stores the IP address and TEID of the GTP-U of the MGW, and the target access network provides the IP address and TEID.
  • the target mobility management entity sends a CS to PS handover response message corresponding to the first UE to the MSC, where the CS to PS handover response message carries the handover resource prepared by the target access network for the first UE, and the target access network is the first
  • the VoIP dedicated bearer of the UE carries the prepared GTP-U tunnel, so that the first UE, after switching to the target access network, uses the VoIP dedicated bearer to carry the VoIP session between the first UE and the MGW.
  • the CS to PS handover response message may further carry the IP address and TEID of the GTP-U of the target access network, and the MSC may further notify the MGW of the IP address and TEID (F-TEID) of the GTP-U of the target access network.
  • the MGW saves the IP address and TEID of the GTP-U of the target access network.
  • the establishment of the VoIP dedicated bearer corresponding to the first UE of the first UE between the MGW and the eNB is completed.
  • the voice service of the first UE in the CS network can be mapped to the VoIP session of the target network, and the VoIP dedicated bearer corresponding to the first UE between the eNB and the MGW is used to carry the VoIP session between the first UE and the MGW.
  • the transmission path of the VoIP session data is: First UE ⁇ ->eNB ⁇ -> MGW.
  • the target access network e.g., eNB
  • it can configure the VoIP session parameters of the VoIP dedicated bearer, and then the VoIP dedicated bearer can be utilized to receive and transmit the VoIP session data packet.
  • the MME may further trigger the establishment of the eNB and the MGW when the VoIP dedicated bearer corresponding to the first UE is triggered between the setup eNB and the MGW.
  • the video dedicated bearer corresponding to the first UE where the video dedicated bearer is used to carry the video session between the first UE and the MGW after accessing the target access network.
  • the establishment of a video-specific bearer is similar to the way VoIP-specific bearers are established.
  • the voice part of the video call of the first UE in the source network may be mapped to the target network.
  • only the VoIP dedicated 7-carrier may be established, and the video-specific 7-carrier may not be established.
  • the UE can be switched from the CS domain to the PS domain, and in the CS to PS handover process, the target mobility management entity triggers establishment between the eNB and the MGW, and thus can be in the UE.
  • the voice service in the CS domain is quickly mapped to the VoIP session of the target network, and the established VoIP dedicated bearer is used to carry its VoIP data stream, which is beneficial to maintain the voice continuity of the UE domain handover.
  • the MME triggers the establishment of a VoIP dedicated bearer between the UE-1, the eNB, and the MGW, and the MGW forwards the uplink and downlink VoIP data packets of the UE-1.
  • the specific may include:
  • UE-1 performs a CS voice call
  • the RNS/BSS initiates a handover procedure, and sends a CS to PS handover request message corresponding to the UE-1 to the visited MSC.
  • the visited MSC is an MSC that is closer to the target network (LTE network), and the serving MSCs that visit the MSC and the UE-1 may be the same MSC or different MSCs.
  • Visit MSC supports reverse single voice call continuity (SRVCC, Single Radio Voice Call Continuity). If the visited MSC is not the current serving MSC of the UE-1, the visited MSC may initiate the CS-to-PS handover of the UE-1 according to different policies. Alternatively, the serving MSC of the UE may also initiate the corresponding UE-1. CS to PS switch.
  • SRVCC Single Radio Voice Call Continuity
  • the serving MSC needs to support the reverse SRVCC.
  • the service of the UE-1 may include: the visited MSC sends a MAP_SUB_HANDOVER message to the serving MSC of the UE-1; the serving MSC of the UE-1 further initiates a CS to PS handover procedure to the MME.
  • the CS to PS handover corresponding to UE-1 is initiated by the visited MSC (hereinafter referred to as MSC) as an example. It can be understood that if the calling MSC directly initiates the CS to PS handover to the MME, the upgrade of the serving MSC can be avoided, and only the MSC adjacent to the LTE needs to be upgraded, which is advantageous for cost saving.
  • the MSC sends a CS to PS handover request message corresponding to the UE-1 to the MME.
  • the CS to PS handover request message corresponding to the UE-1 sent by the MSC to the MME may carry one or more of the following information: CKCS and IKCS, KSIMSC, and MGW of the CS domain.
  • the CodeC used by the UE-1 in the PS may select a common CodeC in the CodeC of the PS domain supported by the UE-1 and the CodeC supported by the MGW, and the CodeC may be in the Attach process, the Setup process, or the LAU of the UE-1. In the process, 4 ⁇ is given to the MGW.
  • the MME receives the CS to PS handover request of the UE-1 sent by the MSC, and the MME initiates a handover request procedure to the eNB, and sends a handover request message corresponding to the UE-1 to the eNB, instructing the eNB to prepare a handover resource for the UE-1, and triggering establishment.
  • a VoIP dedicated bearer between the eNB and the MGW;
  • the CS to PS handover request carries the address of the MGW, the IP address and the TEID of the GTP-U tunnel prepared by the MGW for the VoIP dedicated bearer.
  • the MME may generate a NONCE parameter, and may select the CS key as the root key of the LTE key derivation, derive the LTE key, and further notify the UE.
  • the LTE key deduction is performed by using the CS key.
  • KSIMSC can be used in the handover command to instruct the UE to perform LTE key deduction using the CS key.
  • the MME receives the CS to PS handover request message of the UE-1 from the MSC, and may initiate a location update procedure to the HSS to determine whether the UE-1 has subscription information on the LTE network, and if so, trigger the establishment of the eBN and The VoIP dedicated bearer between the MGWs; if not, the handover procedure can be terminated.
  • the eNB receives the handover request message of the UE-1 from the MME, and further stores information such as the address of the MGW and the GTP-U TEID of the MGW, and feeds back a handover request acknowledgement message to the MME, where the bearer eNB prepares for the UE-1.
  • Information such as the handover resource information, the address of UE-1, the IP address of the GTP-U tunnel prepared by the eNB for the VoIP dedicated bearer, and the TEID.
  • the MME sends a CS-to-PS handover response message corresponding to the UE-1 to the MSC, where the eNB can carry the handover resource information prepared by the eNB for the UE-1, the IP address and the TEID of the GTP-U tunnel prepared by the eNB for the VoIP dedicated bearer. .
  • the MSC notifies the MGW of the IP address and TEID of the GTP-U tunnel prepared by the eNB for the VoIP dedicated bearer, and the MGW further saves the IP address and the TEID of the GTP-U tunnel prepared by the eNB for the VoIP dedicated bearer, and thus, the eNB to the MGW
  • the VoIP dedicated bearer corresponding to UE-1 is established.
  • steps 801 to 806 describe the CS to PS handover preparation phase of UE-1.
  • the following describes the CS to PS handover execution phase of UE-1. 807.
  • the MSC receives the CS to PS handover response message of the UE-1 from the MME, and sends a CS to PS handover command to the UE-1 through the RNC, instructing the UE-1 to access the eNB.
  • the RNC sends a handover command to the UE-1, where the eNB carries the handover resource information prepared by the UE-1.
  • the UE-1 receives the handover command and accesses the eNB.
  • the UE-1 may further send a handover complete message to the eNB.
  • the eNB receives the handover complete message from the UE-1, and may further send a handover complete message to the MME to the MME. Notifying UE-1 that the handover is completed;
  • the LTE network and the UE can synchronize configuration parameters in multiple ways.
  • One of the following manners may be: one or more of the following parameters are sent by the MME to the UE-1: the IP address of the UE-1, the special APN, the TFT, the bearer identifier, the codec format, the packetization interval, and the RTP payload type. , MGW address, port and other parameters.
  • the MME may send a non-access stratum (NAS, Non-Access Statun) message to the UE-1, and carry the VoIP session parameter in the NAS message.
  • the VoIP session parameter is notified to the UE-1, and the UE-1 obtains the VoIP session parameter by receiving and parsing the NAS message, and performs configuration; or the MME may also carry the VoIP session parameter in the handover request sent to the eNB; It is sent to the RNS/BSS in the container, and the RNS/BSS can carry it to the UE-1 in the handover command, and the UE-1 synchronizes the VoIP session parameters with the LTE network.
  • NAS non-access stratum
  • Mode 2 may be: UE-1 and MGW each configure a VoIP dedicated bearer using default VoIP session parameters.
  • UE-1 uses a private address and port to carry a VOIP stream
  • the MGW address uses a private address and port to carry the VOIP stream.
  • UE-1 generates a TFT based on these addresses and ports.
  • the RTP payload type can also be set according to the default value.
  • the codec format can use AMR (variable multi-rate voice format), and the parameters such as the packing interval also use the default value.
  • the UE-1 receives the VoIP session parameters sent by the MME, locally create configuration parameters such as an APN, an IP address, a port, and a TFT, and may further respond to the MME.
  • configuration parameters such as an APN, an IP address, a port, and a TFT
  • the UE can receive and send the VOIP data stream.
  • the MME does not deliver the VoIP session parameters to the UE-1
  • the UE-1 can use the default parameters for the local VoIP dedicated bearer configuration.
  • the MME may send a location update request to the HSS.
  • the message is initiated to obtain the related subscription data of the UE-1 from the HSS.
  • the UE-1 may perform an attach procedure to complete the acquisition of the related subscription data.
  • the transmission path of the VoIP uplink data of the UE-1 is UE-1 ->eNB ->MGW; the transmission path of the VoIP downlink data of the UE-1 is MGW -> eNB -> UE-1;
  • the MME may further trigger the establishment of the corresponding UE-1 video dedicated bearer between the eNB and the MGW, where the video dedicated bearer is used for carrying The video session between the UE-1 and the MGW after accessing the target access network.
  • the establishment of a video-specific bearer is similar to the establishment of a VoIP-specific bearer.
  • the voice part of the UE-1 in the video call of the source network may be mapped to the target network.
  • the VoIP dedicated bearer may be established, but the video dedicated bearer may not be established.
  • UE-1 If UE-1 has not been registered in the IMS before, UE-1 initiates IMS registration, and initiates an IMS domain conversion process.
  • the IMS may instruct the MSC/MGW to release the corresponding session of the UE-1.
  • the UE-1 After the domain conversion is completed, the UE-1 establishes a new bearer in the LTE network.
  • the transmission path of VoIP uplink data of UE-1 is UE-1 -> eNB -> SGW -> PGW;
  • the VoIP downlink data transmission path of UE-1 is PGW -> SGW -> eNB -> UE-1;
  • the MSC/MGW sends a delete bearer request to the MME, and initiates the bearer release, and triggers the release of the VOIP dedicated bearer corresponding to UE-1 between the eNB and the MGW established before the domain transition.
  • the MME sends a bearer release command to the eNB, instructing the eNB to delete the VoIP dedicated bearer corresponding to the UE-1 between the MGW and the eNB established before the domain conversion.
  • the eNB receives a bearer release command from the MME, and deletes a corresponding bearer established before the UE-1 domain transition, and the eNB and the UE-1 perform RRC connection reconfiguration.
  • the eNB sends a bearer release response to the MME.
  • the UE can be switched from the CS domain to the PS domain, and in the CS to PS handover process, the MME triggers the establishment of the eNB and the MGW, and then the UE can be switched to the target network.
  • the voice service in the CS domain is quickly mapped to the VoIP session of the target network, and the established VoIP dedicated bearer is used to carry its VoIP data stream, which is beneficial to maintain the voice continuity of the UE domain handover.
  • the UE may further perform IMS domain conversion, and may maintain the UE domain. Simplify the VoIP data bearer while switching the voice continuity.
  • the embodiments of the present invention further provide corresponding devices and communication systems.
  • a mobility management entity 900 may include: a first receiving module 910, a first dedicated bearer triggering module 920, a first sending module 930, and a second sending module 940.
  • the first receiving module 910 is configured to receive a CS to PS switch request message from a corresponding first UE of the MSC.
  • the first dedicated bearer triggering module 920 is configured to trigger the establishment of an Internet Protocol Voice VoIP dedicated bearer corresponding to the first UE between the serving gateway SGW and the media gateway MGW, or trigger the establishment of the first UE corresponding to the SGW and the packet data gateway PGW.
  • VoIP dedicated bearer
  • the first sending module 930 is configured to send a handover request message to the target access network, and instruct the target access network to prepare a handover resource for the first UE.
  • the second sending module 940 is configured to send a CS to PS handover response message corresponding to the first UE to the MSC, where the CS to PS handover response message carries the handover resource prepared by the target access network for the first UE, so that the first After switching to the target access network, the UE uses the VoIP dedicated bearer to carry the VoIP session between the first UE and the MGW.
  • the CS to packet switched domain PS handover request message received by the first receiving module 910 carries the address information of the MGW;
  • the mobility management entity 900 can also include:
  • a first default bearer triggering module configured to send a setup session message carrying the MGW address information to the SGW, and trigger the SGW to send a setup session message to the MGW, to establish a default bearer corresponding to the first UE between the SGW and the MGW;
  • a second default bearer triggering module configured to send a setup session message to the SGW, to trigger the SGW to send a setup session message to the PGW, to establish a default bearer corresponding to the first UE between the SGW and the PGW;
  • the first dedicated bearer triggering module 920 may include:
  • a first dedicated bearer triggering submodule configured to: after the default bearer of the first UE is established between the SGW and the MGW, trigger the MGW to send a bearer setup message to the SGW, to establish a VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW. ; or,
  • a second dedicated bearer triggering sub-module configured to send a bearer resource command message to the SGW after the default bearer of the first UE is established between the SGW and the MGW, and trigger the SGW to send a bearer resource command message to the MGW to establish the SGW and the MGW.
  • a VoIP dedicated bearer corresponding to the first UE;
  • a third dedicated bearer triggering sub-module configured to send a request bearer resource command message to the SGW after the default bearer of the first UE is established between the SGW and the PGW, and trigger the SGW to send a bearer resource command message to the PGW to establish the SGW and the PGW.
  • a VoIP dedicated bearer corresponding to the first UE.
  • the mobility management entity 700 may further include:
  • a sending module configured to send a VoIP session parameter to the first UE.
  • the sending module may include:
  • a first sending submodule configured to send a VoIP session parameter to the first UE by using non-access stratum signaling
  • a second sending sub-module configured to send the VoIP session parameter to the target access network, so that the target access network encapsulates the VoIP session parameter in a transparent container and returns the source access network (for example, RNC), the source The access network sends the VoIP session parameters to the first UE by using a handover command.
  • the mobility management entity 700 may further include:
  • a key derivation module configured to acquire a CS key, and use the CS key to derive a long-term evolution LTE network key;
  • a key sending module configured to notify the first UE of the LTE network key, or notify the first UE of a parameter used to derive the LTE network key.
  • This parameter can be a CS key.
  • a user equipment 1000 may include:
  • the second receiving module 1010 is configured to receive a handover command that is sent by the source access network, where the handover command carries the handover resource information prepared by the target access network for the user equipment UE.
  • the switching module 1020 is configured to access the target access network.
  • a parameter configuration module 1030 configured to configure a VoIP session parameter of the VoIP dedicated bearer, so as to utilize
  • the VoIP dedicated bearer carries a VoIP session between the UE and the MGW.
  • the parameter configuration module 1030 may be configured to perform parameter configuration by using a VoIP session configuration parameter delivered by the MME, or perform parameter configuration by using a local default VoIP session parameter.
  • a mobility management entity 1100 may include: a third receiving module 1110, configured to receive a CS to PS handover request message from a corresponding first UE of an MSC, and a corresponding one from the SGSN. a PS handover request message of a UE;
  • the third sending module 1120 sends a handover request message to the target access network, and instructs the target access network to prepare a handover resource corresponding to the PS handover request message from the SGSN for the first UE.
  • the fourth sending module 1130 is configured to send a CS to PS handover response message corresponding to the first UE to the MSC, and send a PS handover response message corresponding to the first UE to the SGSN, so that the MSC and/or the SGSN indicate the UE access The above target access network;
  • the second dedicated bearer triggering module 1140 is configured to: after the first UE handover is completed, trigger to establish an inter-network protocol voice VoIP dedicated bearer corresponding to the first UE between the SGW and the MGW, or trigger to establish a corresponding first UE between the SGW and the PGW.
  • the VoIP dedicated bearer is used to enable the first UE to use the VoIP dedicated bearer to carry the VoIP session between the first UE and the MGW after switching to the target access network.
  • a user equipment 1200 according to an embodiment of the present invention includes:
  • the fourth receiving module 1210 is configured to receive a handover command that is sent by the source access network, where the handover command carries the handover resource information prepared by the target access network for the user equipment UE.
  • the switching module 1220 is configured to access the target access network.
  • the third triggering module 1230 is configured to: after the user equipment UE 1200 completes the handover, trigger the establishment of the Internet Protocol Voice VoIP dedicated bearer corresponding to the UE between the serving gateway SGW and the media gateway MGW, or trigger the establishment of the corresponding UE between the SGW and the PGW.
  • VoIP dedicated bearer
  • a parameter configuration module 1240 configured to configure a VoIP session parameter of the foregoing VoIP dedicated bearer, so that The VoIP dedicated bearer is used to carry the VoIP session between the UE and the MGW.
  • a mobility management entity 1300 includes:
  • the fifth receiving module 1310 is configured to receive a CS to PS handover request message from the corresponding first UE of the MSC, where the CS to PS handover request message carries the MGW for the VoIP dedicated bearer of the first UE.
  • the fourth triggering module 1320 is configured to send a handover request message to the target access network, where the handover request message carries the GTP-U tunnel prepared by the MGW as a VoIP dedicated bearer of the first UE, and indicates that the target access network is the first UE. Preparing to switch resources, and triggering establishment of a VoIP dedicated bearer corresponding to the first UE between the target access network and the MGW;
  • the fifth sending module 1330 is configured to send, to the MSC, a CS to PS handover response message corresponding to the first UE, where the CS to PS handover response message carries the handover resource prepared by the target access network for the first UE, and the target connection
  • the GTP-U tunnel is prepared for the VoIP dedicated bearer of the first UE, so that the first UE, after switching to the target access network, uses the VoIP dedicated bearer to carry the VoIP session between the first UE and the MGW.
  • the embodiment of the invention further provides a communication system, which includes:
  • the mobility management entity 900, the user equipment 1000, the mobility management entity 1100, the user equipment 1200, or the mobility management entity 1300 can be completed by a program to instruct related hardware.
  • the program can be stored in a computer readable storage medium.
  • the storage medium can include: Read-only memory, random access memory, disk or optical disk, etc.
  • circuit switching domain to packet switching domain switching method, device and communication system provided by the embodiments of the present invention are described in detail above.
  • specific examples are applied to the principle and implementation of the present invention.
  • the description of the above embodiments is only for helping to understand the method of the present invention and its core ideas; at the same time, for those skilled in the art, according to the idea of the present invention, in the specific embodiments and application scopes

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Abstract

本发明实施例公开了一种电路交换域到分组交换域的切换方法和设备及通信系统,其中的一种CS到PS的切换方法包括:目标移动性管理实体接收来自MSC的对应第一UE的CS到PS切换请求消息;触发建立SGW和MGW之间对应第一UE的VoIP专用承载,或触发建立SGW和PGW之间对应第一UE的VoIP专用承载;向目标接入网发送切换请求消息,指示目标接入网为第一UE准备切换资源;向MSC发送对应第一UE的CS到PS切换响应消息,以使得第一UE在切换到目标接入网后,使用该VoIP专用承载来承载第一UE与MGW之间的VoIP会话。本发明实施例的方案有利于保持UE从CS域切换到PS域时的语音连续性。

Description

电路交换域到分组交换域的切换方法和设备及通信系统 本申请要求于 2010年 4月 30 日提交的, 申请号为 201010168695. 6 , 发 明名称为 "电路交换域到分组交换域的切换方法和设备及通信系统" 的 中国申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信技术领域,具体涉及电路交换域到分组交换域的切换方法 和设备及通信系统。
背景技术
当前, 很多地区已经广泛部署了第二代全球移动通信技术 /第三代全球移 动通信技术(2G/3G, 2ndGeneration/3rd Generation ) 网络, 在某种程度上可看 作一种全面的覆盖。
基于通信发展需要, 第三代合作伙伴项目标准组织推出新一代的演进网 络架构, 其中, 核心网部分为系统架构演进 ( SAE , System Architecture Evolution ) 网络, 接入网部分为长期演进 ( LTE , Long Term Evolution ) 网络 的演进的通用移动通信系统陆地无线接入网( E-UTRAN )。新一代的演进网络 已经覆盖到一些城区及话务热点地区。
为描述方便, 将仅提供 PS域的 SAE/LTE等网络称为纯 PS域网络。 针对不 同的网络承载机制, 可将移动通信的业务分为:
电路交换(CS, Circuit Switching )域承载的业务, 如语音电话, 短消息 和补充业务等;
分组交换(PS, Packet Switching )域承载的业务, 包括数据业务和会话 业务等,会话业务包括网际协议承载的语音( VoIP, Voice over Internet Protocol ) 业务。
在实际应用中, 语音业务可以承载在 CS域, 也可以承载在 PS域。 基于 不同的网络覆盖场景, 用户在通信过程中可能经常会出现需要从 2G/3G网络 切换到 LTE网络的问题, 因此, 如何保持网络切换过程的语音连续性是一个 需要研究解决的技术问题。
发明内容 本发明实施例提供电路交换域到分组交换域的切换方法和设备及通信系 统, 有利于保持 UE从 CS域切换到 PS域时的语音连续性。
根据本发明的第一方面, 提供一种电路交换域到分组交换域的切换方法, 包括:
目标移动性管理实体接收来自移动交换中心 MSC的对应第一用户设备 UE的电路交换域 CS到分组交换域 PS切换请求消息;
触发建立服务网关 SGW和媒体网关 MGW之间对应第一 UE的网际协议语 音 VoIP专用承载, 或者, 触发建立 SGW和分组数据网关 PGW之间对应第一 UE 的 VoIP专用承载;
向目标接入网发送切换请求消息, 指示所述目标接入网为第一 UE准备切 换资源;
向所述 MSC发送对应第一 UE的 CS到 PS切换响应消息, 所述 CS到 PS切换 响应消息携带所述目标接入网为第一 UE准备的切换资源,以使得第一 UE在切 换到所述目标接入网后,使用所述 VoIP专用承载来承载第一 UE与所述 MGW之 间的 VoIP会话。
根据本发明的第二方面, 提供一种电路交换域到分组交换域的切换方法, 包括:
目标移动性管理实体接收来自 MSC的对应第一 UE的 CS到 PS切换请求消 息, 以及来自 SGSN的对应第一 UE的 PS切换请求消息;
向目标接入网发送切换请求消息, 指示所述目标接入网为第一 UE准备对 应来自所述 SGSN的 PS切换请求消息的切换资源;
向所述 MSC发送对应第一 UE的 CS到 PS切换响应消息, 并向所述 SGSN发 送对应第一 UE的 PS切换响应消息,所述 CS到 PS切换响应消息携带所述目标接 入网为第一 UE准备的切换资源;
在第一 UE切换完成后, 触发建立 SGW和 MGW之间对应第一 UE的网际协 议语音 VoIP专用承载, 或者, 触发建立 SGW和 PGW之间对应第一 UE的 VoIP 专用承载, 以使得第一 UE在切换到所述目标接入网后, 使用所述 VoIP专用承 载来承载第一 UE与所述 MGW之间的 VoIP会话。
根据本发明的第三方面, 提供一种电路交换域到分组交换域的切换方法 , 包括:
第一 UE接收源接入网下发的切换命令, 所述切换命令携带目标接入网为 第一 UE准备的切换资源信息;
接入所述目标接入网;
在第一 UE切换完成后, 触发建立 SGW和 MGW之间对应第一 UE的 VoIP专 用承载, 或者触发建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载;
配置所述 VoIP专用承载的 VoIP会话参数, 以便利用所述 VoIP专用承载来 承载第一 UE与所述 MGW之间的 VoIP会话。
根据本发明的第四方面, 提供一种电路交换域到分组交换域的切换方法, 包括:
目标移动性管理实体接收来自 MSC的对应第一 UE的 CS到 PS切换请求消 息, 所述 CS到 PS切换请求消息携带 MGW为第一 UE的 VoIP专用承载准备的 GTP-U隧道;
向目标接入网发送切换请求消息, 所述切换请求消息携带所述 MGW为第 一 UE的 VoIP专用承载准备的 GTP-U隧道,指示所述目标接入网为第一 UE准备 切换资源,并触发建立所述目标接入网和 MGW之间对应第一 UE的 VoIP专用承 载;
向所述 MSC发送对应第一 UE的 CS到 PS切换响应消息, 所述 CS到 PS切换 响应消息携带所述目标接入网为第一 UE准备的切换资源、 以及所述目标接入 网为第一 UE的 VoIP专用承载准备的 GTP-U隧道, 以使得第一 UE在切换到所述 目标接入网后,使用所述 VoIP专用承载来承载第一 UE与所述 MGW之间的 VoIP 会话。
根据本发明的第五方面, 提供一种移动性管理实体, 包括:
第一接收模块,用于接收来自移动交换中心 MSC的对应第一 UE的 CS到 PS 切换请求消息;
第一专用承载触发模块,用于触发建立服务网关 SGW和媒体网关 MGW之 间对应第一 UE的网际协议语音 VoIP专用承载, 或者, 触发建立 SGW和分组数 据网关 PGW之间对应第一 UE的 VoIP专用承载;
第一发送模块, 用于向目标接入网发送切换请求消息, 指示所述目标接 入网为第一 UE准备切换资源;
第二发送模块, 用于向所述 MSC发送对应第一 UE的 CS到 PS切换响应消 息, 所述 CS到 PS切换响应消息携带所述目标接入网为第一 UE准备的切换资 源, 以使得第一 UE在切换到所述目标接入网后, 使用所述 VoIP专用承载来承 载第一 UE与所述 MGW之间的 VoIP会话。
根据本发明的第六方面, 提供一种移动性管理实体, 包括:
第三接收模块, 用于接收来自 MSC的对应第一 UE的 CS到 PS切换请求消 息, 以及来自 SGSN的对应第一 UE的 PS切换请求消息;
第三发送模块, 用于向目标接入网发送切换请求消息, 指示所述目标接 入网为第一 UE准备对应来自所述 SGSN的 PS切换请求消息的切换资源;
第四发送模块, 用于向所述 MSC发送对应第一 UE的 CS到 PS切换响应消 息, 并向所述 SGSN发送对应第一 UE的 PS切换响应消息, 所述 CS到 PS切换响 应消息携带所述目标接入网为第一 UE准备的切换资源;
第二专用承载触发模块, 用于在第一 UE切换完成后, 触发建立 SGW和 MGW之间对应第一 UE的网际协议语音 VoIP专用承载, 或, 触发建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载,以使得第一 UE在切换到所述目标接入 网后, 使用所述 VoIP专用承载来承载第一 UE与所述 MGW之间的 VoIP会话。
根据本发明的第七方面, 提供一种用户设备, 包括:
第四接收模块, 用于接收源接入网下发的切换命令, 所述切换命令携带 目标接入网为所述用户设备 UE准备的切换资源信息;
切换模块, 用于接入所述目标接入网;
第三触发模块, 用于在所述用户设备 UE切换完成后, 触发建立 SGW和媒 体网关 MGW之间对应所述 UE的 VoIP专用承载, 或者触发建立 SGW和 PGW之 间对应所述 UE的 VoIP专用承载;
参数配置模块, 用于配置所述 VoIP专用承载的 VoIP会话参数, 以便利用 所述 VoIP专用承载来承载所述 UE与所述 MGW之间的 VoIP会话。
根据本发明的第八方面, 提供一种移动性管理实体, 包括:
第五接收模块, 用于接收来自 MSC的对应第一 UE的 CS到 PS切换请求消 息, 所述 CS到 PS切换请求消息携带 MGW为第一 UE的 VoIP专用承载准备的 GTP-U隧道;
第四触发模块, 用于向目标接入网发送切换请求消息, 所述切换请求消 息携带所述 MGW为第一 UE的 VoIP专用承载准备的 GTP-U隧道,指示所述目标 接入网为第一 UE准备切换资源,并触发建立所述目标接入网和 MGW之间对应 第一 UE的 VoIP专用承载;
第五发送模块, 用于向所述 MSC发送对应第一 UE的 CS到 PS切换响应消 息, 所述 CS到 PS切换响应消息携带所述目标接入网为第一 UE准备的切换资 源、 以及所述目标接入网为第一 UE的 VoIP专用承载准备的 GTP-U隧道, 以使 得第一 UE在切换到所述目标接入网后,使用所述 VoIP专用承载来承载第一 UE 与所述 MGW之间的 VoIP会话。
由上可以看出, 本发明第一方面提供的实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切换过程中, MME触发建立 SGW和 MGW之间或者 SGW 和 PGW之间对应该 UE的 VoIP专用承载,进而可以在 UE切换到目标网络后,将 其在 CS域的语音业务快速映射为目标网络的 VoIP会话, 利用建立的 VoIP专用 承载来承载其 VoIP数据流, 有利于保持 UE域切换的语音连续性。
本发明第二和第三方面提供的实施例可以实现 UE从 CS域切换到 PS域,并 且在 CS到 PS切换完成后, UE或 MME触发建立 SGW和 MGW或 SGW和 PGW之 间对应该 UE的 VoIP专用承载, 进而可以在 UE切换到目标网络后, 将其在 CS 域的语音业务快速映射为目标网络的 VoIP会话, 利用建立的 VoIP专用承载来 承载其 VoIP数据流, 有利于保持 UE域切换的语音连续性。 本发明第四方面提供的实施例可以实现 UE从 CS域切换到 PS域, 并且 在 CS到 PS切换完成后, MME触发建立 eNB和 MGW之间对应该 UE的 VoIP专用承载, 进而可以在 UE切换到目标网络后,将其在 CS域的语音业务 快速映射为目标网络的 VoIP会话, 利用建立的 VoIP专用承载来承载其 VoIP 数据流, 有利于保持 UE域切换的语音连续性。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中 所需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本 发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动性 的前提下, 还可以根据这些附图获得其他的附图。
图 1-a是本发明实施例提供的 2G/3G网络和 SAE网络布网示意图;
图 1-b是本发明实施例一提供的 CS到 PS切换方法流程示意图;
图 2是本发明实施例二提供的 CS到 PS切换方法流程示意图
图 3是本发明实施例三提供的 CS到 PS切换方法流程示意图;
图 4是本发明实施例四提供的 CS到 PS切换方法流程示意图
图 5是本发明实施例五提供的 CS到 PS切换方法流程示意图;
图 6-a是本发明实施例六提供的 CS到 PS切换方法流程示意图;
图 6-b是本发明实施例六提供的另一 CS到 PS切换方法流程示意图; 图 7是本发明实施例七提供的另一 CS到 PS切换方法流程示意图;
图 8是本发明实施例八提供的另一 CS到 PS切换方法流程示意图;
图 9是本发明实施例提供的一种移动性管理实体示意图;
图 10是本发明实施例提供的一种用户设备示意图;
图 11是本发明实施例提供的另一种移动性管理实体示意图;
图 12是本发明实施例提供的另一种用户设备示意图;
图 13是本发明实施例提供的另一种移动性管理实体示意图。 具体实施方式
本发明实施例提供一种电路交换域到分组交换域的切换方法和设备及通 信系统, 有利于保持 UE从 CS域切换到 PS域时的语音连续性。
以下分别进行详细说明。
为便于理解, 首先提供如图 1-a所示的一种 2G/3G和 SAE网络布网示意 图, 其中, E-UTRAN主要由演进基站(eNB, Evolution-NodeB )组成。 演进 网络的核心网部分包括移动管理实体(MME, Mobility Management Entity ) 和 SAE网关( SAE Gateway )。 SAE网关包括服务网关( SGW, Serving Gateway ) 和分组数据网络网关 (PGW, PDN Gateway )„
其中, MME为演进网络系统的核心网部分的控制平面节点, 担用户设 备( UE , User Equipment )上下文以及用户平面承载的管理功能; SGW主要 承担业务数据的传输功能, PGW主要承担信令的传输功能。 GERAM/UTRAN 为 2G/3G网络的接入网, 移动交换中心 (MSC, Mobile Switching Center )主 要负责语音业务的承载控制, 媒体网关 (MGW, Media Gateway )主要负责 CS语音业务的承载, 而服务 GPRS (通用分组无线服务, General Packet Radio Service ) 支撑节点 ( SGSN, Serving GPRS Support Node )主要负责数据业务 的承载控制。
本发明实施例的技术方案主要针对 UE如何从 2G/3G网络切换到 LTE网 络 /高速分组接入( HSPA, High-Speed Packet Access ) 网络等纯 PS域网络, 以及在切换过程中如何保持通话连续性的问题。 其中, 在 2G/3G网络切换到 HSPA网络的流程中, HSPA网络对应的目标移动管理实体是 SGSN , 对应的 接入网设备包括无线网络控制器(RNC, Radio Network Controller )0 实施例一
下面先以目标移动性管理实体(例如 MME或 SGSN ) 的角度介绍本发明 实施例的一种电路交换域到分组交换域的切换方法的一个实施例, 可包括: 目标移动性管理实体接收来自 MSC的对应第一 UE的 CS到 PS切换请求消息;触 发建立 SGW和 MGW之间对应第一 UE的 VoIP专用承载, 或者触发建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载; 向目标接入网发送切换请求消息, 指 示目标接入网为第一 UE准备切换资源; 向 MSC发送对应第一 UE的 CS到 PS切 换响应消息,该 CS到 PS切换响应消息携带目标接入网为第一 UE准备的切换资 源, 以使得第一 UE在切换到目标接入网后, 使用该 VoIP专用承载来承载第一 UE与 MGW之间的 VoIP会话。
参见图 1-b, 具体流程可以包括:
110、 目标移动性管理实体接收来自 MSC的对应第一 UE的 CS到 PS切换请 求消息;
其中, 本实施例中的目标移动性管理实体例如可以是 LTE网络对应的 MME, 也可以是 HSPA网络对应的 SGSN, 当然也可以是其它类型的 PS域网络 中负责移动性管理功能的网络实体; 上述的 MSC可以是拜访 MSC (例如距离 目标网络较近的 MSC ), 也可以是第一 UE的服务 MSC。
在一种应用场景下, 第一 UE的 CS到 PS切换请求消息中可携带 MGW的地 址信息, 当然还可以携带其它相关信息。 120、 目标移动性管理实体触发建立 SGW和 MGW之间对应第一 UE的 VoIP 专用承载, 或者触发建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载;
在一种应用场景下, 若 SGW和 MGW之间此前还未建立对应第一 UE的默 认承载, 则目标移动性管理实体可先触发建立 SGW和 MGW之间对应第一 UE 的默认承载, 然后再触发建立 SGW和 MGW之间对应第一 UE的 VoIP专用承载。
在实际应用中, 目标移动性管理实体可通过多种方式触发建立 SGW和 MGW之间对应第一 UE的默认承载, 一种方式可以包括: 向 SGW发送携带 MGW地址信息的建立会话消息, 触发 SGW向 MGW发送建立会话消息, 以建 立 SGW和 MGW之间对应第一 UE的默认承载。触发建立 SGW和 MGW之间对应 第一 UE的 VoIP专用承载的方式例如可包括: 在 SGW和 MGW之间对应第一 UE 的默认承载建立后, 触发 MGW向 SGW发送建立承载消息, 以建立 SGW和 MGW之间对应第一 UE的 VoIP专用承载; 或者, 在 SGW和 MGW之间对应第一 UE的默认承载建立后, 向 SGW发送承载资源命令消息,触发 SGW发送承载资 源命令消息给 MGW, 进而触发 MGW发起专用承载建立过程, 以建立 SGW和 MGW之间对应第一 UE的 VoIP专用承载。
其中, 若 SGW和 MGW之间建立了对应第一 UE的 VoIP专用承载, 第一 UE 切换到目标网络(例如 LTE或 HSPA )后, 其在 CS网络的语音业务便可映射为 目标网络的 VoIP会话, 并利用该 SGW和 MGW之间对应第一 UE的 VoIP专用承 载来承载其与 MGW之间的 VoIP会话, 而该 VoIP会话数据的传输路径为: 第一 UE<— >eNB<— >SGW〈一〉 MGW。
在一种应用场景下,若 SGW和 PGW之间此前还未建立对应第一 UE的默认 承载,则目标移动性管理实体可先触发建立 SGW和 PGW之间对应第一 UE的默 认承载, 然后再触发建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载。 若 SGW和 PGW之间已经建立了对应第一 UE的默认承载 (例如第一 UE在 2G/3G 网络有 PS业务), 则目标移动性管理实体可直接触发建立 SGW和 PGW之间对 应第一 UE的 VoIP专用承载。
在实际应用中, 目标移动性管理实体可通过多种方式触发建立 SGW和 PGW之间对应第一 UE的默认承载, 一种方式可以包括: 向 SGW发送建立会话 消息,触发 SGW向 PGW发送建立会话消息, 以建立 SGW和 PGW之间对应第一 UE的默认承载。 而触发建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载的 方式例如可包括:在 SGW和 PGW之间对应第一 UE的默认承载建立后,向 SGW 发送请求承载资源命令消息, 触发 SGW向 PGW发送承载资源命令消息, 进而 触发 PGW发起专用承载建立过程, 以建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载。
其中, 若 SGW和 PGW之间建立了对应第一 UE的 VoIP专用承载建立, 第一 UE切换在到目标网络后, 其在 CS网络的语音业务便可映射为目标网络的 VoIP 会话, 并利用该 SGW和 PGW之间对应第一 UE的 VoIP专用承载来承载其与 MGW之间的 VoIP会话, 而该 VoIP数据的传输路径为: 第一 UE<― >eNB<― >SGW<— >PGW <— >MGW,而 PGW和 MGW之间可通过 IP数据包承载的形式 转发 VoIP会话数据。
130、 目标移动性管理实体向目标接入网发送切换请求消息, 指示目标接 入网为第一 UE准备切换资源;
其中, 此处目标接入网可以对应为 LTE网络中的 eNB, 或者对应 HSPA网 络中的 RNC等, 或对应于其它 PS网络的接入网设备。 目标接入网为第一 UE准 备切换资源可包括为默认承载和专用承载准备的资源。
140、 目标移动性管理实体向 MSC发送对应第一 UE的 CS到 PS切换响应消 息, 该 CS到 PS切换响应消息携带目标接入网为第一 UE准备的切换资源, 以便 MSC指示第一 UE接入目标接入网, 以使得第一 UE在切换到目标接入网后,使 用 VoIP专用承载来承载第一 UE与 MGW之间的 VoIP会话。
进一步的,若第一 UE在源网络( 2G/3 G )的通话为视频通话,则目标 MME 还可以在触发建立 SGW和 MGW之间对应第一 UE的 VoIP专用承载时, 进一步 触发建立 SGW和 MGW之间对应第一 UE的视频专用承载, 或者, 在触发建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载时, 触发建立 SGW和 PGW之间 对应第一 UE的视频专用承载, 其中, 视频专用承载用于承载第一 UE接入目标 接入网后与 MGW之间的视频会话。 视频专用承载的建立方式与 VoIP专用承载 的建立方式类似, VoIP专用承载和视频专用承载可一并建立。
当然, 也可以只将第一 UE在源网络的视频通话中的语音部分映射到目标 网络, 此时则可以只建立 VoIP专用 7 载, 而可不建立视频专用 7 载。
在一种应用场景下,向 MSC发送对应第一 UE的 CS到 PS切换响应消息中可 以携带例如目标接入网为第一 UE准备的切换资源、 第一 UE的地址等信息。
MSC接收到对应第一 UE的 CS到 PS切换响应消息后, 可通过 RNC向第一 UE发送切换命令, 指示第一 UE接入目标接入网, 该切换命令中可以携带目标 接入网为第一 UE准备的切换资源等信息。
当第一 UE接入目标接入网(例如 eNB )后,其可配置 VoIP专用承载的 VoIP 会话参数, 之后便可利用该 VoIP专用承载来接收和发送 VoIP会话数据包。
由上可以看出, 本实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切换过程中, 目标移动性管理实体触发建立 SGW和 MGW之间或者 SGW和 PGW之间对应该 UE的 VoIP专用承载,进而可以在 UE切换到目标网络后,将其 在 CS域的语音业务快速映射为目标网络的 VoIP会话, 利用建立的 VoIP专用承 载来承载其 VoIP数据流, 有利于保持 UE域切换的语音连续性。
下面再以 UE的角度介绍本发明实施例的电路交换域到分组交换域的切换 方法的另一个实施例, 可包括: 第一 UE接收源接入网 (例如 RNC ) 下发的切 换命令, 该切换命令携带目标接入网为第一 UE准备的切换资源信息; 接入目 标接入网; 在 VoIP专用承载上配置 VoIP会话参数, 以便利用该 VoIP专用承载 来承载第一 UE与 MGW之间的 VoIP会话。
其中,第一 UE可以利用 MME(例如利用 NAS信令、切换命令)下发的 VoIP 会话参数进行参数配置; 或者, 利用本地默认的 VoIP会话参数进行参数配置。
进一步的, 第一 UE在切换完成后, 还可发起 IMS会话域转换。 实施例二
为便于理解, 下面以 UE-1从 2G/3G网络切换到 LTE网络的过程为例, 对本 发明实施例的方案进行进一步详细的描述。
本实施例在 UE-1的 CS to PS切换过程中, MME触发建立 UE-1、 eNB、 SGW 和 MGW之间的 VoIP专用承载, 由 MGW转发 UE- 1的上下行 VoIP数据包。
参见图 2, 具体可以包括:
201、 UE-1进行 CS语音通话;
202、 RNS/BSS发起切换过程, 向拜访 MSC发送对应 UE-1的 CS到 PS切换 请求消息;
其中, 拜访 MSC是距离目标网络( LTE网络)较近的 MSC , 拜访 MSC和 UE-1的服务 MSC可能是同一个 MSC, 也可能是不同的 MSC。 拜访 MSC支持反 向单一无线语音呼叫连续性( SRVCC, Single Radio Voice Call Continuity )。 若 拜访 MSC不是 UE-1当前的服务 MSC ( serving MSC ), 则拜访 MSC可根据不同 的策略自行发起 UE-1的 CS到 PS切换; 或者, 也可以由 UE的服务 MSC发起对 应 UE-1的 CS到 PS切换。
其中, 若由 UE-1的服务 MSC进行 CS到 PS切换, 则该服务 MSC需要支持反 向 SRVCC, 在实际应用中, 若拜访 MSC并非 UE-1当前的服务 MSC C, 则 UE-1 的服务 MSC发起对应 UE-1的 CS到 PS切换流程可以包括:拜访 MSC向 UE-1的服 务 MSC发送 MAP— SUB— HANDOVER消息; UE- 1的服务 MSC进一步向 MME发 起 CS到 PS的切换流程。 本实施例中主要以拜访 MSC (以下简称为 MSC )发起 对应 UE-1的 CS到 PS切换为例进行说明。可以理解,若由拜访 MSC直接向 MME 发起 CS到 PS切换, 则可以避免对服务 MSC进行升级, 从而只需要对与 LTE相 邻的 MSC进行升级, 这样有利于节约成本。
203、 MSC向 MME发送对应 UE-1的 CS到 PS切换请求消息;
在一种应用场景下, MSC向 MME发送的对应 UE-1的 CS到 PS切换请求消 息可以携带如下信息的一个或多个: CS域的 CKCS和 IKCS、 KSIMSC、 MGW 的地址、 端口、 UE在 PS使用的 CodeC等信息。
其中, UE-1在 PS使用的 CodeC, 可以在 UE-1支持的 PS域的 CodeC和 MGW 支持的 CodeC中选择一个公共的 CodeC, 而该 CodeC可以在 UE-1的 Attach流程、 Setup过程或 LAU过程中上报给 MSC。
204、 MME接收来自 MSC的对应 UE-1的 CS到 PS切换请求消息; MME向 SGW发送创建会话请求消息, 其中携带 MGW的地址信息,还可携带以及国际 移动用户识别码 ( IMSI, International Mobile Subscriber Identity )或者移动台 国际 ISDN号码( MSISDN, Mobile Station International ISDN Number )等, 触 发建立 SGW和 MGW间对应 UE-1的默认承载。
其中, MME向 SGW发送的创建会话请求消息携带特定的 APN, 该特定的 APN与 MGW相关联(即指向 MGW ), 该 APN可由运营商来配置。
进一步的, MME接收到来自 MSC的 UE-1的 CS到 PS切换请求消息后, 可 先向 HSS发起位置更新流程, 判断 UE-1在 LTE网络是否有签约信息, 若有, 则 再触发建立 SGW和 MGW间的默认承载; 若无, 则可终止切换流程。
205、 SGW向 MGW发送创建会话请求消息, 指示 MGW建立与 SGW之间 对应 UE-1的默认承载;
其中, SGW向 MGW发送的创建会话请求消息可携带特定的 APN。
206、 MGW接收来自 SGW的创建会话请求消息, 建立 SGW与 MGW之间 对应 UE-1的默认承载, 并可向 SGW发送创建会话响应消息。
在一种应用场景下, 建立默认承载的服务质量(QoS, Quality of Service ) 可在 MGW上产生或基于其配置,或者通过和 PCRF实体交互获得 ( MSC/MGW 和 PCRF存在接口)。
在 MGW和 SGW之间的对应 UE-1的默认承载建立后, 便可以进一步建立 MGW和 SGW之间的对应 UE-1的其它承载,例如,可创建用于承载 UE-1的 VoIP 会话的 VoIP专用承载。
207、 SGW向 MME发送创建会话响应消息,指示 MGW和 SGW之间的对应 UE-1的默认承载建立完成;
208、 MGW向 SGW发送创建承载请求消息, 指示建立 MGW和 SGW之间 对应 UE-1的 VOIP专用承载;
其中, 步骤 208与步骤 206可同时执行, 即 MGW可以在建立 UE-1的默认承 载的同时, 指示建立 MGW和 SGW之间对应 UE-1的 VOIP专用承载。
在一种应用场景下, 建立 VoIP专用承载的 QoS可在 MGW上产生或基于其 配置, 或者通过和 PCRF实体交互获得。
209、 SGW向 MME发送创建 7 载请求消息 , 向 MME指示 MGW和 SGW之 间对应 UE-1的 VOIP专用承载建立完成, 并指示 MME触发建立 SGW和 eNB之 间对应 UE-1的 VOIP专用 7 载;
可以理解, 也可以在步骤 207的同时, 向 MME指示 MGW和 SGW之间对应 UE-1的 VOIP专用承载建立完成。
此外 , MME也可通过如下方式触发建立 MGW和 SGW之间对应 UE-1的 VOIP承载, 例如: MME向 SGW发送承载资源命令消息, SGW向 MGW发送承 载资源命令消息, 指示建立 MGW和 SGW之间对应 UE-1的 VOIP承载;
MGW向 SGW发送创建承载请求, SGW向 MME发送创建承载请求, MME 向 SGW发送创建承载响应, SGW向 MGW发送创建承载响应。
210、 MME向 eNB发起切换请求流程, 向 eNB发送对应 UE- 1的切换请求消 息, 指示 eNB为 UE准备切换资源; 并指示 eNB建立 eNB与 SGW之间对应 UE-1 的 VOIP专用承载, 以便于临时承载 UE- 1在 LTE的 VOIP会话。
其中, 若 MME还收到 CS域和 PS域的密钥, MME可产生 NONCE参数(该 参数可派生 LTE密钥), 并可选择 CS密钥作为 LTE密钥推演的根密钥, 推演出 LTE密钥,并可进一步通知 UE-1利用 CS密钥进行 LTE密钥推演,例如可在切换 命令中用 KSIMSC指示 UE-1利用 CS密钥进行 LTE密钥推演,或者也可以直接将 LTE密钥通知 UE-1。
若 eNB确定资源充足, 则可允许 UE-1接入; 若 eNB确定资源不足, 则可拒 绝 UE-1接入。 本实施以 eNB确定资源充足为例进行说明。
eNB准备的切换资源对应 SGW和 MGW建立的默认承载和专用承载。
211、 MME向 MSC发送 UE-1的 CS到 PS切换响应消息。
可以理解, 步骤 201 ~ 211介绍了 UE-1的 CS到 PS切换准备阶段, 下面介绍 UE-1的 CS到 PS切换执行阶段。
212、 MSC接收来自 MME的 UE的 CS到 PS切换响应消息, 并可通过 RNC向 UE发送 CS到 PS切换命令,指示 UE-1接入 eNB;其中,切换命令中可以携带 eNB 为 UE-1准备的切换资源等。
213、 UE接收切换命令, 接入到 eNB; UE可进一步向 eNB发送切换完成消 息; eNB接收来自 UE的切换完成消息, 并向可进一步向 MME发送切换完成消 息, 通知 MME UE-1切换完成;
214、 LTE网络和 UE- 1可通过多种方式来同步 VoIP会话参数。
其中一种方式可以是: 由 MME向 UE-1下发如下参数的一个或多个: UE-1 的 IP地址、 特殊 APN、 TFT、 承载标识、 编解码格式、 打包间隔时间、 RTP净 荷类型、 MGW地址、 端口等参数。
其中, UE-1的 IP地址、 TFT、 编解码格式、 打包间隔时间、 RTP净荷类型、 MGW地址、 端口等可由 MGW来生成, 在 206 - 208步骤中传递给 MME, 或也 可以在 203步骤中传递给 MME; 特殊 APN和承载标识可由 MME生成。
在一种应用场景下, MME可以在 UE-1接入 LTE网络后, 向 UE-1发送非接 入层 ( NAS , Non- Access Statun )消息, 在该 NAS消息中携带上述 VoIP会话参 数, 将上述 VoIP会话参数通知给 UE-1 , UE-1通过接收解析该 NAS消息, 获知 VoIP会话参数, 并配置 VOIP专用承载; 或者, MME也可在向 eNB发送的切换 请求携带上述 VoIP会话参数; 由 eNB封装在 container中发送给 RNS/BSS , 而 RNS/BSS可将其携带在切换命令中通知给 UE-1 , UE-1据此实现和 LTE网络同 步 VoIP会话参数, 并配置 VOIP专用承载。
方式二可以是: UE-1和 MGW各自使用默认的 VoIP会话参数配置 VoIP专用 承载。 例如, UE-1固定使用某个私有地址和端口来承载 VOIP流, MGW固定 使用另一个私有地址和端口来承载 VOIP流, UE-1根据这些地址和端口来生成 TFT。 RTP净荷类型也可以按照默认值设置, 编解码格式可以釆用 AMR (可变 多速率语音格式), 打包间隔等参数也釆用默认值。 其中, 之所以可以使用默 认的 IP和端口,是因为在 MGW上可以根据 GTP承载来区分该 VOIP流是来自哪 个 UE, 而不用根据 VOIP流的 IP地址和端口, 也就是说, 如果多个 UE使用了相 同的 IP地址和端口, MGW也能根据 GTP承载区分开来。
215、若 UE-1接收到 MME下发的 VoIP会话参数, 在本地创建例如 APN、 IP 地址、 端口、 TFT等配置参数, 并可进一步向 MME回复响应。
在本地 VoIP会话参数配置完成后, UE-1便可接收和发送 VOIP数据流; 进一步的, 若 UE-1还没有在 EPC附着, MME可向 HSS发送位置更新请求 消息, 发起位置更新, 从 HSS获取 UE-1的相关签约数据; 或者, 也可由 UE-1 执行一个附着 (attach ) 流程来完成相关签约数据的获取。
216、 MME接收来自 eNB的切换完成通知后, 向 SGW发送更新承载请求 消息, 该更新承载请求消息可携带 eNB的用户面地址;
217、 SGW接收来自 MME的更新承载请求消息, 并向 MGW发送更新承载 请求消息; MGW和 SGW更新承载;
此时, UE- 1的 VoIP上行数据的传送路径为 UE- 1 - >eNB - >SGW - >MGW; UE-1的 VoIP下行数据的传送路径为 MGW - >SGW - >eNB - > UE-1; 进一步的, 若 UE- 1在源网络( 2G/3 G ) 的通话为视频通话, 则 MME还可 在触发建立 SGW和 MGW之间对应 UE-1的 VoIP专用承载时, 进一步触发建立 SGW和 MGW之间对应 UE-1视频专用承载,其中,视频专用承载用于承载 UE-1 接入目标接入网后与 MGW之间的视频会话。 视频专用承载的建立方式于 VoIP 专用承载的建立方式类似。 当然, 也可以只将 UE-1在源网络的视频通话中的语音部分映射到目标网 络, 此时则可以只建立 VoIP专用 7 载, 而可不视频专用 7 载。
218、 若 UE-1此前没有在 IMS注册过, 则 UE-1向 IMS发起 IMS注册, 发起 域转换流程;
其中, 在域转换完成后, UE-1在 LTE网络建立新的承载;
UE-1的 VoIP上行数据的传送路径为 UE-1 - >eNB - >SGW - >PGW;
UE-1的 VoIP下行数据传送路径为 PGW - >SGW - >eNB - > UE-1;
219、 在完成域转换过程后, IMS可指示 MSC/MGW释放 UE的相应会话;
220、 MSC/MGW向 SGW发送删除承载请求, 发起承载释放, 触发释放域 转换前建立的 SGW和 MGW间对应 UE-1的默认承载、以及 SGW和 MGW、 SGW 和 eNB间对应 UE- 1的 VOIP的专用承载, 当然, MSC/MGW还可释放 UE- 1在 CS 域的其它会话。 此外, 也可以由 MSC向 MME发送删除消息, MME触发删除 SGW、 MGW和 ENB上的默认承载和 VoIP专用承载。
221、 SGW向 MME发送删除承载请求, 指示 MME触发删除域转换前建立 的 SGW和 eNB之间对应 UE- 1的 VoIP专用承载;
222、 MME向 eNB发送删除承载命令,指示 eNB删除域转换前建立的 SGW 和 eNB之间对应 UE-1的 VoIP专用承载;
223、 eNB接收来自 MME的删除承载命令,删除在 UE- 1域转换前建立的相 应承载 , eNB和 UE-1进行 RRC连接重配置;
224、 eNB向 MME发送承载释放响应。
可以理解, 步骤 214和 216可以在步骤 213和 218之间的任意时刻执行; 步 骤 215步可在步骤 213和 218之间的任意时刻执行、 或在步骤 203之后执行。
此外, 在反向 SRVCC切换过程中, 若通话中的一方挂机, 则可进行相应 7?载的释放。
参见图 2-b、 例如若 UE- 1挂机 , UE- 1可以向 MME发起 PDN连接释放过程; MME发起承载删除, MGW通知 MSC释放对端的会话; UE-1和 MME去激活承 载。
参见图 2-C、 例如若 UE-1的对端挂机, 可有 2种处理方案:
方案 1、 由 MSC通知 MGW释放会话, MGW作为 PGW发起承载释放; 方案 2、 由 MSC通知 MME释放会话, 由 MME发起承载释放。
由上可以看出, 本实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切换过程中, MME触发建立 SGW和 MGW之间对应该 UE的 VoIP专用承载, 进而可以在 UE切换到目标网络后, 将其在 CS域的语音业务快速映射为目标网 络的 VoIP会话, 利用建立的 VoIP专用承载来承载其 VoIP数据流, 有利于保持 UE域切换的语音连续性。
进一步的, 在切换完成后, UE进一步进行 IMS域转换, 可在保持 UE域切 换的语音连续性的同时, 简化 VoIP数据的承载方式。
实施例三
为便于理解, 下面仍以 UE-1从 2G/3G网络切换到 LTE网络的过程为例, 对 本发明实施例的方案进行进一步详细的描述。本实施例在 UE-1的 CS to PS切换 过程中 , MME触发建立 UE-1、 eNB、 SGW和 PGW之间的 VoIP专用承载,由 PGW 和 MGW交互 UE- 1的上下行 VoIP数据包。
参见图 3 , 具体可以包括:
301、 UE进行 CS语音通话;
302、 RNS/BSS发起切换过程, 向 MSC发送 CS到 PS切换请求消息; 其中, 拜访 MSC是距离目标网络( LTE网络)较近的 MSC , 拜访 MSC和 UE-1的服务 MSC可能是同一个 MSC, 也可能是不同的 MSC。 拜访 MSC支持反 向 SRVCC。 若拜访 MSC不是 UE-1当前的服务 MSC, 则拜访 MSC可根据不同的 策略自行发起 UE-1的 CS到 PS切换; 或者, 也可以由 UE的服务 MSC发起对应 UE-1的 CS到 PS切换。
其中, 若由 UE-1的服务 MSC进行 CS到 PS切换, 则该服务 MSC需要支持反 向 SRVCC, 在实际应用中, 若拜访 MSC并非 UE-1当前的服务 MSC C, 则 UE-1 的服务 MSC发起对应 UE-1的 CS到 PS切换流程可以包括:拜访 MSC向 UE-1的服 务 MSC发送 MAP— SUB— HANDOVER消息; UE- 1的服务 MSC进一步向 MME发 起 CS到 PS的切换流程。 本实施例中主要以拜访 MSC (以下简称为 MSC )发起 对应 UE-1的 CS到 PS切换为例进行说明。
303、 MSC向 MME发送 UE-1的 CS到 PS切换请求;
在一种应用场景下, MSC向 MME发送的 UE的 CS到 PS切换请求可以携带 如下信息的一个或多个: CS域的 CKCS和 IKCS、 KSIMSC、 MGW的地址、 端 口、 UE在 PS使用的 CodeC等信息。
其中, UE-1在 PS使用的 CodeC, 可以在 UE-1支持的 PS域的 CodeC和 MGW 支持的 CodeC中选择一个公共的 CodeC, 而该 CodeC可以在 UE-1的 Attach流程、 Setup过程或 LAU过程中上报给 MSC。
304、 MME接收来自 MSC的对应 UE-1的 CS到 PS切换请求消息;
MME向 SGW发送创建会话请求消息, 触发建立 SGW和 PGW间对应 UE-1 的默认承载。 当然, 若此前已有默认承载, 也可以不建立新的默认承载。
其中, MME向 SGW发送的创建会话请求消息可携带特定的 APN, 该 APN 可由运营商来配置。
进一步的, MME接收到来自 MSC的 UE-1的 CS到 PS切换请求消息后, 可 先向 HSS发起位置更新流程, 判断 UE-1在 LTE网络是否有签约信息, 若有, 则 再触发建立 SGW和 PGW间的默认承载; 若无, 则可终止切换流程。
在一种应用场景下, 建立上述默认承载的 QoS参数可在 MME上产生或基 于其配置。
305、 SGW向 PGW发送创建会话请求, 指示 PGW建立与 SGW之间对应 UE-1的默认承载;
其中, SGW向 PGW发送的创建会话请求消息可携带上述特定的 APN。
306、 PGW接收来自 SGW的创建会话请求消息, 建立 SGW与 PGW之间对 应 UE-1的默认承载, 并可向 SGW发送创建会话响应消息;
在 PGW和 SGW之间的对应 UE- 1的默认承载建立后, 便可以进一步建立 PGW和 SGW之间的对应 UE-1的其它承载, 例如, 可创建用于承载 UE-1的 VoIP 会话的 VoIP专用承载。
MGW和 PGW之间可提供 SGi接口, MGW和 PGW之间则可以通过 IP数据 包发送的方式来转发 UE的上下行数据。 例如可以通过在 MGW和 PGW之间建 立虚拟专用网络(VPN, Virtual Private Network ) 隧道等方式来传输 UE-1与 MGW之间的 VOIP会话流。
307、 SGW接收来自 PGW的创建会话响应消息, 向 MME发送创建会话响 应消息, 指示 PGW和 SGW之间的对应 UE-1的默认承载建立完成;
308、 MME向 SGW发送承载资源命令消息, 触发 SGW向 PGW发送承载资 源命令消息, 触发建立 PGW和 SGW之间对应 UE-1的 VOIP专用承载;
309、 SGW向 PGW发送承载资源命令消息, 建立 PGW和 SGW之间对应 UE-1的 VOIP专用承载;
310、 PGW接收来自 SGW的承载资源命令消息, 向 SGW发送创建承载请 求消息, 指示 SGW建立 PGW和 SGW之间对应 UE-1的 VOIP专用承载;
在一种应用场景下, 建立默认承载的 QoS可以在 PGW上产生或基于其配 置、 或者通过和 PCRF实体交互后获得。
311、 SGW向 MME发送创建承载请求消息 , 向 MME指示 MGW和 SGW之 间对应 UE-1的 VOIP专用承载建立完成, 并指示 MME触发建立 SGW和 eNB之 间对应 UE-1的 VOIP专用 7 载;
312、 MME向 eNB发送对应 UE-1的切换请求消息, 指示 eNB为 UE准备切 换资源; 并指示 eNB建立 eNB与 SGW之间对应 UE-1的 VOIP专用承载, 以便于 临时承载 UE- 1在 LTE的 VOIP会话。
其中, 若 MME还收到 CS域和 PS域的密钥, MME可产生 NONCE参数, 并 可选择 CS密钥作为 LTE密钥推演的根密钥, 推演出 LTE密钥, 并可进一步通知 UE- 1利用 CS密钥进行 LTE密钥推演, 例如可在切换命令中用 KSIMSC指示 UE-1利用 CS密钥进行 LTE密钥推演, 或直接将 LTE密钥通知给 UE-1。
若 eNB确定资源充足, 则可允许 UE-1接入; 若 eNB确定资源不足, 则可拒 绝 UE-1接入。 本实施以 eNB确定资源充足为例进行说明。
313、 MME向 MSC发送 UE-1的 CS到 PS的切换响应消息, 其中可携带 PGW 为 UE-1分配的 IP地址 /端口等信息, 以及 eNB为 UE-1准备的切换资源信息。
可以理解, 步骤 301 ~ 313介绍了 UE的 CS到 PS切换准备阶段, 下面接收介 绍 UE的 CS到 PS切换执行阶段。 B. 切换执行阶段的步骤说明:
314、 MSC接收来自 MME的 UE-1的 CS到 PS切换响应消息, 并可通过 RNC 向 UE-1发送 CS到 PS切换命令, 指示 UE-1接入 eNB;
其中, 切换命令携带 eNB为 UE-1准备的切换资源信息。
315、 UE-1接收切换命令, 接入到 eNB; UE-1可进一步向 eNB发送切换完 成消息; eNB接收来自 UE- 1的切换完成消息, 并向可进一步向 MME发送切换 完成消息 , 通知 MME UE-1切换完成;
316、 LTE网络和 UE- 1可通过多种方式来同步 VoIP会话参数。 其中一种方式可以是: 由 MME向 UE-1下发如下参数的一个或多个: UE-1 的 IP地址、 特殊 APN、 TFT、 承载标识、 编解码格式、 打包间隔时间、 RTP净 荷类型、 MGW地址、 端口等参数。
其中, UE-1的 IP地址、 TFT、 编解码格式、 打包间隔时间、 RTP净荷类型、 MGW地址、 端口等可由 MGW来生成, 可通过多种方式传递给 MME, 例如可 以在 303步骤中传递给 MME; 特殊 APN和承载标识可由 MME生成。
在一种应用场景下, MME可以在 UE-1接入 LTE网络后, 向 UE-1发送非接 入层( NAS , Non- Access Statun )消息, 在该 NAS消息中携带上述 VoIP会话参 数, 将上述 VoIP会话参数通知给 UE-1 , UE-1通过接收解析该 NAS消息, 获知 VoIP会话参数, 并配置 VoIP专用承载; 或者, MME也可在向 eNB发送的切换 请求携带上述 VoIP会话参数; 由 eNB封装在 container中发送给 RNS/BSS , 而 RNS/BSS可将其携带在切换命令中通知给 UE-1 , UE-1据此实现和 LTE网络同 步 VoIP会话参数, 配置 VoIP专用承载。
方式二可以是: UE-1和 MGW各自使用默认的 VoIP会话参数配置 VoIP专用 承载。 例如, UE-1固定使用某个私有地址和端口来承载 VOIP流, MGW固定 使用另一个私有地址和端口来承载 VOIP流, UE-1根据这些地址和端口来生成 TFT。 RTP净荷类型也可以按照默认值设置, 编解码格式可以釆用 AMR (可变 多速率语音格式), 打包间隔等参数也釆用默认值。
317、若 UE-1接收到 MME下发的 VoIP会话参数, 在本地创建例如 APN、 IP 地址、 端口、 TFT等配置参数, 并可进一步向 MME回复响应。
在本地 VoIP参数配置完成后, UE便可接收和发送 VOIP数据流;
此外, 若 MME不向 UE-1下发 VoIP会话参数, UE-1可以使用默认参数进行 本地配置 VoIP专用 载配置。
进一步的, 若 UE-1还没有在 EPC附着, MME可向 HSS发送位置更新请求 消息, 发起位置更新, 从 HSS获取 UE-1的相关签约数据; 或者, 也可由 UE-1 执行一个附着 (attach ) 流程来完成相关签约数据的获取。
318、 MME接收来自 eNB的切换完成消息后, 向 SGW发送更新承载请求 消息, 该更新承载请求消息可携带 eNB的用户面地址信息;
319、 SGW接收来自 MME的更新承载请求消息, 并向 PGW发送更新承载 请求消息; PGW和 SGW更新承载; 此时, UE-1的 VoIP上行数据的传送路径为 UE-1 - >eNB - >SGW - > PGW - >MGW; UE-1的 VoIP下行数据的传送路径为 MGW - >PGW - >SGW - >eNB - > UE-1 ;
进一步的, PGW和 MGW还可考虑建立一个 VPN通道, 以保证 PGW和 MGW能交顺利的转发 UE-1的上下行数据。
进一步的, 若 UE- 1在源网络( 2G/3 G ) 的通话为视频通话, 则 MME还可 触发建立 SGW和 PGW之间对应 UE-1的 VoIP专用承载时,进一步触发建立 SGW 和 PGW之间对应 UE-1的视频专用承载, 其中, 视频专用承载用于承载 UE-1接 入目标接入网后与 MGW之间的视频会话。 视频专用承载的建立方式于 VoIP专 用承载的建立方式类似。
当然, 也可以只将 UE-1在源网络的视频通话中的语音部分映射到目标网 络, 此时则可以只建立 VoIP专用承载, 而可不建立视频专用承载。
320、 若 UE-1此前没有在 IMS注册过, 则 UE-1向 IMS发起 IMS注册, 发起 域转换流程;
其中, 在域转换完成后, UE-1在 LTE网络建立新的承载;
UE-1的 VoIP上行数据的传送路径为 UE-1 - >eNB - >SGW - >PGW;
UE-1的 VoIP下行数据传送路径为 PGW - >SGW - >eNB - > UE-1;
321、 在域转换完成后, IMS可进一步指示 MSC/MGW释放 UE-1的相应会 话; 并可以进一步通过 MSC指示 MME发起临时会话释放;
322、 MSC/MGW释放 UE-1在 CS域的会话, 向 MME发送删除承载请求, 发起承载释放, 触发释放域转换前建立的 SGW和 eNB间、 SGW和 PGW之间对 应 UE- 1的 VOIP的专用承载等。
323、 MME接收来自 MSC/MGW的删除承载请求, 向 SGW发送删除承载 发送删除承载命令, 释放相应承载。
324、 MME向 eNB发送删除承载命令,指示 eNB删除域转换前建立的 SGW 和 eNB之间对应 UE-1的 VoIP专用承载;
325、 eNB接收来自 MME的删除承载命令,删除在 UE- 1域转换前建立的相 应承载, eNB和 UE-1进行 RRC连接重配置; 326、 eNB向 MME发送承载释放响应。
可以理解, 步骤 315和 318可以在步骤 313和 320之间的任意时刻执行; 步 骤 316步可在步骤 314和 320之间的任意时刻执行、 或在步骤 303之后执行。
由上可以看出, 本实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切换过程中, MME触发建立 SGW和 PGW之间对应该 UE的 VoIP专用承载, 进而可以在 UE切换到目标网络后, 将其在 CS域的语音业务快速映射为目标网 络的 VoIP会话, 利用建立的 VoIP专用承载来承载其 VoIP数据流, 有利于保持 UE域切换的语音连续性。
进一步的, 在切换完成后, UE进一步进行 IMS域转换, 可在保持 UE域切 换的语音连续性的同时, 简化 VoIP数据的承载方式。
实施例四
下面以目标移动性管理实体(例如 MME或 SGSN ) 的角度介绍本发明实 施例的一种电路交换域到分组交换域的切换方法的一个实施例, 可包括: 目 标移动性管理实体接收来自 MSC的对应第一 UE的 CS到 PS切换请求消息,以及 来自 SGSN的对应第一 UE的 PS切换请求消息; 向目标接入网发送切换请求消 息, 指示目标接入网为第一 UE准备对应来自 SGSN的 PS切换请求消息的切换 资源; 向该 MSC发送对应第一 UE的 CS到 PS切换响应消息, 并向该 SGSN发送 对应第一 UE的 PS切换响应消息,该 CS到 PS切换响应消息携带目标接入网为第 一 UE准备的切换资源; 在第一 UE切换完成后, 触发建立 SGW和 MGW之间对 应第一 UE的 VoIP专用承载, 或者, 触发建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载, 以使得第一 UE在切换到目标接入网后, 使用该 VoIP专用承载 来承载第一 UE与 MGW之间的 VoIP会话。
本实施例的技术方案主要针对切换之前第一 UE在 2G/3G网络存在 PS业务 的场景, 在第一 UE切换完成后, 由目标移动性管理实体触发建立 VoIP专用承 载, 参见图 4, 具体流程可以包括:
410、 目标移动性管理实体接收来自 MSC的对应第一 UE的 CS到 PS切换请 求消息, 以及来自 SGSN的对应第一 UE的 PS切换请求消息;
其中, 本实施例中的目标移动性管理实体例如可以是 LTE网络对应的 MME, 也可以是 HSPA网络对应的 SGSN, 当然也可以是其它类型的 PS域网络 中负责移动性管理功能的网络实体; 上述的 MSC可以是拜访 MSC (例如距离 目标网络较近的 MSC ), 也可以是第一 UE的服务 MSC; SGSN为 2G/3G网络中 的 SGSN。
在一种应用场景下, 第一 UE的 CS到 PS切换请求消息中可携带 MGW的地 址信息, 当然还可以携带其它相关信息。
420、 目标移动性管理实体向目标接入网发送切换请求消息, 指示该目标 接入网为第一 UE准备对应来自 SGSN的 PS切换请求消息的切换资源;
其中, 此处目标接入网可以对应为 LTE网络中的 eNB, 或者对应 HSPA网 络中的 RNC等, 或对应于其它 PS网络的接入网设备。
目标接入网准备对应来自 SGSN的 PS切换请求消息的切换资源,以便于将 第一 UE在 2G/3G网络中的 PS业务切换到目标网络。
430、 目标移动性管理实体向该 MSC发送对应第一 UE的 CS到 PS切换响应 消息, 并向该 SGSN发送对应第一 UE的 PS切换响应消息, 该 CS到 PS切换响应 消息携带目标接入网为第一 UE准备的切换资源, 以便 MSC和 /或 SGSN指示 UE 接入该目标接入网;
在一种应用场景下, 向 MSC发送对应第一 UE的 PS切换响应消息中可以携 带例如目标接入网为第一 UE准备的切换资源、 第一 UE的地址等信息(该地址 可以为默认的 IP地址)。
MSC和 SGSN接收到对应第一 UE的 CS到 PS切换响应消息后, 可通过 RNC 向第一 UE发送切换命令, 指示第一 UE接入目标接入网, 该切换命令中可以携 带目标接入网为第一 UE准备的切换资源等信息。
440、 目标移动性管理实体在第一 UE切换完成后, 触发建立 SGW和 MGW 之间对应第一 UE的网际协议语音 VoIP专用承载, 或者, 触发建立 SGW和 PGW 之间对应第一 UE的 VoIP专用承载, 以使得第一 UE在切换到目标接入网后, 使 用该 VoIP专用承载来承载第一 UE与 MGW之间的 VoIP会话。
第一 UE可对 VoIP专用承载进行 VoIP会话参数配置, 之后便可利用该 VoIP 专用承载来接收和发送 VoIP会话数据包。
进一步的, 若第一 UE在源网络(2G/3G ) 的通话为视频通话, 则 MME还 可在触发建立 SGW和 MGW之间对应第一 UE的 VoIP专用承载时, 进一步触发 建立 SGW和 MGW之间对应第一 UE的视频专用承载, 或者, 在触发建立 SGW 和 PGW之间对应第一 UE的 VoIP专用承载时 , 触发建立 SGW和 PGW之间对应 第一 UE的视频专用承载, 其中, 视频专用承载用于承载第一 UE接入目标接入 网后与 MGW之间的视频会话。 视频专用承载的建立方式于 VoIP专用承载的建 立方式类似。
当然, 也可以只将第一 UE在源网络的视频通话中的语音部分映射到目标 网络, 此时则可以只建立 VoIP专用 7 载, 而可不建立视频专用 7 载。
由上可以看出, 本实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切换完成后, 目标移动性管理实体触发建立 SGW和 MGW或 SGW和 PGW之 间对应该 UE的 VoIP专用承载, 进而可以在 UE切换到目标网络后, 将其在 CS 域的语音业务快速映射为目标网络的 VoIP会话, 利用建立的 VoIP专用承载来 承载其 VoIP数据流, 有利于保持 UE域切换的语音连续性。 实施例五
下面以用户设备的角度介绍本发明实施例的一种电路交换域到分组交换 域的切换方法的另一实施例, 可以包括: 第一 UE接收源接入网下发的切换命 令, 该切换命令携带目标接入网为第一 UE准备的切换资源信息; 接入目标接 入网; 在第一 UE切换完成后, 触发建立服务网关 SGW和媒体网关 MGW之间 对应第一 UE的网际协议语音 VoIP专用承载, 或者触发建立 SGW和分组数据网 关 PGW之间对应第一 UE的 VoIP专用承载;配置第一 UE的 VoIP专用承载的 VoIP 会话参数, 以便利用该 VoIP专用承载来承载第一 UE与 MGW之间的 VoIP会话。
本实施例的技术方案主要针对切换之前第一 UE在 2G/3G网络存在 PS业务 的场景, 在第一 UE切换完成后, 由目标移动性管理实体触发建立 VoIP专用承 载, 参见图 5, 具体流程可以包括:
510、第一 UE接收源接入网下发的切换命令,该切换命令携带目标接入网 为第一 UE准备的切换资源信息;
其中, 此处的源接入网例如为 2G/3G中 RNC; 目标接入网可对应为 LTE网 络中的 eNB, 或者对应 HSPA网络中的 RNC等, 或对应于其它 PS网络的接入网 设备。
520、 第一 UE接入目标接入网; 530、 第一 UE在切换完成后, 触发建立服务网关 SGW和媒体网关 MGW之 间对应第一 UE的网际协议语音 VoIP专用承载, 或者触发建立 SGW和分组数据 网关 PGW之间对应第一 UE的 VoIP专用承载;
540、第一 UE配置该 VoIP专用承载的 VoIP会话参数, 以便利用该 VoIP专用 承载来承载第一 UE与 MGW之间的 VoIP会话。
进一步的, 若第一 UE在源网络(2G/3G ) 的通话为视频通话, 则 MME还 可在触发建立 SGW和 MGW之间对应第一 UE的 VoIP专用承载时, 进一步触发 建立 SGW和 MGW之间对应第一 UE的视频专用承载, 或者, 在触发建立 SGW 和 PGW之间对应第一 UE的 VoIP专用承载时, 进一步触发建立 SGW和 PGW之 间对应第一 UE的视频专用承载, 其中, 视频专用承载用于承载第一 UE接入目 标接入网后与 MGW之间的视频会话。 视频专用承载的建立方式于 VoIP专用承 载的建立方式类似。
当然, 也可以只将第一 UE在源网络的视频通话中的语音部分映射到目标 网络, 此时则可以只建立 VoIP专用 7 载, 而可不建立视频专用 7 载。
由上可以看出, 本实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切换完成后, 由 UE触发建立 SGW和 MGW或 SGW和 PGW之间对应该 UE的 VoIP专用承载, 进而可以在 UE切换到目标网络后, 将其在 CS域的语音业务快 速映射为目标网络的 VoIP会话, 利用建立的 VoIP专用承载来承载其 VoIP数据 流, 有利于保持 UE域切换的语音连续性。
实施例六
本实施针对 UE在 2G/3G网络也存在 PS业务的场景, 在 CS到 PS切换过程中 可不在目标网络(LTE或 HSPA )建立默认承载和 VoIP专用承载, 在切换完成 后由 UE或 MME发起 VoIP专用承载的建立 /修改。
参见图 6-a, 具体可以包括:
601、 UE进行 CS语音通话;
602、 RNS/BSS发起切换过程, 向拜访 MSC发送 CS到 PS切换请求消息, 并向 SGSN发送 PS切换请求消息;
其中, 拜访 MSC和 UE-1的服务 MSC可能是同一个 MSC, 也可能是不同的 MSC。 拜访 MSC支持反向 SRVCC。 若拜访 MSC不是 UE-1当前的服务 MSC, 则 拜访 MSC可根据不同的策略自行发起 UE-1的 CS到 PS切换;或者,也可以由 UE 的服务 MSC发起对应 UE-1的 CS到 PS切换。
其中, 若由 UE-1的服务 MSC进行 CS到 PS切换, 则该服务 MSC需要支持反 向 SRVCC, 在实际应用中, 若拜访 MSC并非 UE-1当前的服务 MSC C, 则 UE-1 的服务 MSC发起对应 UE-1的 CS到 PS切换流程可以包括:拜访 MSC向 UE-1的服 务 MSC发送 MAP— SUB— HANDOVER消息; UE- 1的服务 MSC进一步向 MME发 起 CS到 PS的切换流程。 本实施例中主要以拜访 MSC (以下简称为 MSC )发起 对应 UE-1的 CS到 PS切换为例进行说明。
603、 MSC向 MME发送对应 UE-1的 CS到 PS切换请求消息; SGSN向 MME 发送对应 UE- 1的 PS切换请求消息;
在一种应用场景下, MSC向 MME发送的对应 UE-1的 CS到 PS切换请求消 息可以携带如下信息的一个或多个: CS域的 CKCS和 IKCS、 KSIMSC、 MGW 的地址、 端口、 UE在 PS使用的 CodeC等信息。
其中, UE-1在 PS使用的 CodeC, 可以在 UE-1支持的 PS域的 CodeC和 MGW 支持的 CodeC中选择一个公共的 CodeC, 而该 CodeC可以在 UE-1的 Attach流程、 Setup过程或 LAU过程中上报给 MSC。
604、 MME接收 MSC发送的 UE-1的 CS到 PS切换请求,和 SGSN发送的 UE-1 的 PS切换请求; MME向 eNB发起切换请求流程, 向 eNB发送对应切换请求消 息, 指示 eNB为 UE-1准备 SGSN发送的 UE的切换请求消息的切换资源;
此处, MME只指示 eNB为 UE-1准备 SGSN发送的 UE的切换请求消息的切 换资源, 以便先切换 2G/3G网络中的 PS业务。
其中, 若 MME还收到 CS域和 PS域的密钥, MME可产生 NONCE参数, 并 可选择 CS密钥作为 LTE密钥推演的根密钥, 推演出 LTE密钥, 并可进一步通知 UE利用 CS密钥进行 LTE密钥推演, 例如可在切换命令中用 KSIMSC指示 UE利 用 CS密钥进行 LTE密钥推演。
进一步的, MME接收到来自 MSC的 UE-1的 CS到 PS切换请求消息, 以及 SGSN发送的 UE-1的 PS切换请求后,可先向 HSS发起位置更新流程, 判断 UE-1 在 LTE网络是否有签约信息, 若有, 则再触发建立 SGW和 MGW之间的默认承 载; 若无, 则可终止切换流程。 605、 MME向 MSC发送对应 UE-1的 CS到 PS切换响应消息, MME向 SGSN 发送 PS切换响应消息。
其中, PS切换响应消息携带 eNB为 UE-1准备的切换资源信息, 还可以携 带 UE-1的地址信息。
UE-1在切换前存在 PS业务, SGSN和 SGW/PGW已经建立 PDN连接, 在切 换准备过程中 MME和 SGW、 MGW不发起默认承载和 VoIP专用承载的建立。
进一步的, 若后续需要建立 UE-1、 SGW和 PGW之间的 VoIP专用承载, 则 该 CS到 PS切换响应消息还可包含 PGW为 UE-1分配的 IP地址 /端口。
可以理解, 步骤 601 ~ 605介绍了 UE-1的 CS到 PS切换准备阶段, 下面介绍 UE-1的 CS到 PS切换执行阶段。
606、 MSC接收来自 MME的 UE-1的 CS到 PS切换响应消息, 并可通过 RNC 向 UE-1发送 CS到 PS切换命令, 指示 UE-1接入 eNB;
SGSN接收来自 MME的 UE-1的 PS切换响应消息, 并可通过 RNC向 UE发送 PS切换命令, 指示 UE-1接入 eNB;
在一种应用场景下, RNC可将来自 SGSN和 MSC的切换命令进行合并, 并 向 UE-1发送合并的切换命令, 其中 eNB为 UE-1准备的切换资源信息。
607、 UE-1接收切换命令, 接入到 eNB; UE-1可进一步向 eNB发送切换完 成消息; eNB接收来自 UE- 1的切换完成消息, 并向可进一步向 MME发送切换 完成消息, 向 MME通知 UE- 1切换完成;
608、 UE-1或 MME触发建立 eNB和 SGW、以及 SGW和 MGW之间对应 UE-1 的默认承载和 VoIP专用承载。
其中, 建立 VoIP专用承载的过程可参考实施例二中的相关描述。
其中, 例如若由 UE-1发起 VoIP专用承载的建立或由 UE-1发起承载资源修 改。 网络通过切换命令 ( eNB )或 NAS信令 ( MME ) 向 UE-1下发 MGW地址、 端口、 CodeC或 QoS等参数。
UE-1根据上述参数发起 VoIP专用承载的建立。 UE - 1也可用默认参数发 起 VoIP专用承载的建立。
若由 MME发起 VoIP专用承载的建立, MME收到切换完成消息后,发起承 载资源命令流程, 以触发建立 VoIP专用承载。 609、 LTE网络和 UE可以通过多种方式来同步配置参数。
其中一种方式可以是: 由 MME向 UE-1下发如下参数的一个或多个: UE-1 的 IP地址、 特殊 APN、 TFT、 承载标识、 编解码格式、 打包间隔时间、 RTP净 荷类型、 MGW地址、 端口等参数。
在一种应用场景下, MME可以在 UE-1接入 LTE网络后, 向 UE-1发送非接 入层( NAS , Non- Access Statun )消息, 在该 NAS消息中携带上述 VoIP会话参 数, 将上述 VoIP会话参数通知给 UE-1 , UE-1通过接收解析该 NAS消息, 获知 VoIP会话参数, 并进行配置; 或者, MME也可在向 eNB发送的切换请求携带 上述 VoIP会话参数; 由 eNB封装在 container中发送给 RNS/BSS, 而 RNS/BSS可 将其携带在切换命令中通知给 UE-1 , UE-1据此实现和 LTE网络同步 VoIP会话 参数。
方式二可以是: UE-1和 MGW各自使用默认的 VoIP会话参数配置 VoIP专用 承载。例如, UE-1的地址固定使用某个私有地址和端口来承载 VOIP流, MGW 的地址固定使用另一个私有地址和端口来承载 VOIP流, UE-1根据这些地址和 端口来生成 TFT。 RTP净荷类型也可以按照默认值设置, 编解码格式可以釆用 AMR (可变多速率语音格式), 打包间隔等参数也釆用默认值。
610、若 UE-1接收到 MME下发的 VoIP会话参数, 在本地创建例如 APN、 IP 地址、 端口、 TFT等配置参数, 并可进一步向 MME回复响应。
在本地 VoIP会话参数配置完成后, UE便可接收和发送 VOIP数据流; 此外, 若 MME不向 UE-1下发 VoIP会话参数, UE-1可以使用默认参数进行 本地 VoIP专用承载配置。
进一步的, 若 UE-1还没有在 EPC附着, MME可向 HSS发送位置更新请求 消息, 发起位置更新, 从 HSS获取 UE-1的相关签约数据; 或者, 也可由 UE-1 执行一个附着 (attach ) 流程来完成相关签约数据的获取。
611、 MME接收到切换完成通知后, 向 SGW发送更新承载请求消息, 该 更新承载请求消息可携带 eNB的用户面地址;
612、 SGW接收来自 MME的更新承载请求消息, 并向 MGW发送更新承载 请求消息; MGW和 SGW更新承载;
此时, UE- 1的 VoIP上行数据的传送路径为 UE- 1 - >eNB - >SGW - >MGW; UE-1的 VoIP下行数据的传送路径为 MGW - >SGW - >eNB - > UE-1; 进一步的, 若 UE- 1在源网络( 2G/3 G ) 的通话为视频通话, 则 MME还可 在触发建立 SGW和 MGW之间对应 UE-1的 VoIP专用承载时, 进一步触发建立 SGW和 MGW之间对应 UE-1视频专用承载,其中,视频专用承载用于承载 UE-1 接入目标接入网后与 MGW之间的视频会话。 视频专用承载的建立方式于 VoIP 专用承载的建立方式类似。
当然, 也可以只将 UE-1在源网络的视频通话中的语音部分映射到目标网 络, 此时则可以只建立 VoIP专用承载, 而可不建立视频专用承载。
613、 若 UE-1此前没有在 IMS注册过, 则 UE-1发起 IMS注册, 发起 IMS域 转换流程;
614、 在完成 IMS域转换过程后, IMS可指示 MSC/MGW释放 UE的相应会 话;
其中, 在域转换完成后, UE-1在 LTE网络建立新的承载;
UE-1的 VoIP上行数据的传送路径为 UE-1 - >eNB - >SGW - >PGW;
UE-1的 VoIP下行数据传送路径为 PGW - >SGW - >eNB - > UE-1;
615、 MSC/MGW向 SGW发送删除承载请求, 发起承载释放, 触发释放域 转换前建立的 SGW和 MGW间对应 UE-1的默认承载、以及 SGW和 MGW、 SGW 和 eNB间对应 UE- 1的 VOIP的专用承载, 当然, MSC/MGW还可释放 UE- 1在 CS 域的其它会话。
616、 SGW向 MME发送删除承载请求, 指示 MME触发删除域转换前建立 的 SGW和 eNB之间对应 UE- 1的 VoIP专用承载;
617、 MME向 eNB发送删除承载命令,指示 eNB删除域转换前建立的 SGW 和 eNB之间对应 UE-1的 VoIP专用承载;
618、 eNB接收来自 MME的删除承载命令,删除在 UE- 1域转换前建立的相 应承载 , eNB和 UE-1进行 RRC连接重配置;
619、 eNB向 MME发送承载释放响应。
此外,参见图 6-b,与实施例三的方案类似的,也可以选择在 UE接入到 LTE 后, 由 UE或 MME发起建立 eNB和 SGW, 以及 SGW和 PGW之间的 VoIP专用承 载的建立 /修改, 此处不再赘述。 由上可以看出, 本实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切换完成后, UE或 MME触发建立 SGW和 MGW或 SGW和 PGW之间对应该 UE的 VoIP专用承载,进而可以在 UE切换到目标网络后,将其在 CS域的语音业 务快速映射为目标网络的 VoIP会话, 利用建立的 VoIP专用承载来承载其 VoIP 数据流, 有利于保持 UE域切换的语音连续性。
进一步的, 在切换完成后, UE可进一步进行 IMS域转换, 可在保持 UE域 切换的语音连续性的同时, 简化 VoIP数据的承载方式。
实施例七
下面以目标移动性管理实体(例如 MME或 SGSN ) 的角度介绍本发明实 施例的一种电路交换域到分组交换域的切换方法的另一个实施例, 可包括: 目标移动性管理实体接收来自移动交换中心 MSC的对应第一用户设备 UE的 CS到 PS切换请求消息, 该 CS到 PS切换请求消息携带 MGW为第一 UE的 VoIP专 用承载准备的 GTP-U隧道( GTP-U隧道由 IP地址和 TEID标识); 向目标接入网 发送切换请求消息,该切换请求消息携带 MGW为第一 UE的 VoIP专用承载准备 的 GTP-U隧道, 指示目标接入网为第一 UE准备切换资源, 并触发建立目标接 入网和 MGW之间对应第一 UE的 VoIP专用承载; 向 MSC发送对应第一 UE的 CS 到 PS切换响应消息, CS到 PS切换响应消息携带目标接入网为第一 UE准备的 切换资源、 以及目标接入网为第一 UE的 VoIP专用承载准备的 GTP-U隧道, 以 使得第一 UE在切换到上述目标接入网后, 使用上述 VoIP专用承载来承载第一 UE与上述 MGW之间的 VoIP会话。
参见图 7, 具体流程可以包括:
710、 目标移动性管理实体接收来自移动交换中心 MSC的对应第一用户设 备 UE的电路交换域 CS到分组交换域 PS切换请求消息;
在一种应用场景下, 本实施例中移动性管理实体触发建立 eNB和 MGW之 间通用无线分组业务传输协议( GTP, GPRS ( General Packet Radio Service ) Tunnelling Protocol ) 隧道, 将其作为第一 UE的 VoIP专用承载。 其中, GTP-U 隧道由 IP地址和 TEID ( F-TEID )进行标识。
其中, 第一 UE的 CS到 PS切换请求消息中可携带 MGW的地址信息, MGW 为第一 UE的 VoIP专用承载准备的 GTP-U隧道的 IP地址和 TEID, 当然还可以携 带其它相关信息。 720、 目标移动性管理实体向目标接入网发送切换请求消息, 该切换请求 消息携带上述 MGW为第一 UE的 VoIP专用承载准备的 GTP-U隧道,指示目标接 入网为第一 UE准备切换资源, 并触发建立目标接入网和 MGW之间对应第一 UE的 VoIP专用承载;
在一种应用场景下, 目标移动性管理实体向目标接入网发送切换请求消 息可以携带 MGW的 GTP-U的 IP地址和 TEID, 触发建立目标接入网和 MGW之 间对应第一 UE的 VoIP专用承载, 目标接入网保存 MGW的 GTP-U的 IP地址和 TEID , 目标接入网提供 IP地址和 TEID。
730、 目标移动性管理实体向 MSC发送对应第一 UE的 CS到 PS切换响应消 息, CS到 PS切换响应消息携带目标接入网为第一 UE准备的切换资源, 以及上 述目标接入网为第一 UE的 VoIP专用承载准备的 GTP-U隧道, 以使得第一 UE在 切换到该目标接入网后, 使用该 VoIP专用承载来承载第一 UE与 MGW之间的 VoIP会话。
其中, CS到 PS切换响应消息还可以携带目标接入网的 GTP-U的 IP地址和 TEID, MSC可进一步将目标接入网的 GTP-U的 IP地址和 TEID ( F-TEID )通知 给 MGW, MGW保存目标接入网的 GTP-U的 IP地址和 TEID。 此时, MGW和 eNB之间对应第一 UE的第一 UE的 VoIP专用承载建立完成。 第一 UE在 CS网络 的语音业务便可映射为目标网络的 VoIP会话, 并利用该 eNB和 MGW之间对应 第一 UE的 VoIP专用承载来承载第一 UE与 MGW之间的 VoIP会话, 而该 VoIP会 话数据的传输路径为: 第一 UE<—>eNB<—> MGW。
当第一 UE接入目标接入网(例如 eNB )后,其可配置 VoIP专用承载的 VoIP 会话参数, 之后便可利用该 VoIP专用承载来接收和发送 VoIP会话数据包。
进一步的, 若第一 UE在源网络(2G/3G ) 的通话为视频通话, 则 MME还 可以进一步在触发建立 eNB和 MGW之间对应第一 UE的 VoIP专用承载时,触发 建立 eNB和 MGW之间对应第一 UE的视频专用承载, 其中, 视频专用承载用于 承载第一 UE接入目标接入网后与 MGW之间的视频会话。视频专用承载的建立 方式于 VoIP专用承载的建立方式类似。
当然, 也可以只将第一 UE在源网络的视频通话中的语音部分映射到目标 网络, 此时则可以只建立 VoIP专用 7 载, 而可不建立视频专用 7 载。
由上可见, 本实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切 换过程中, 目标移动性管理实体触发建立 eNB和 MGW之间, 进而可以在 UE 切换到目标网络后,将其在 CS域的语音业务快速映射为目标网络的 VoIP会话, 利用建立的 VoIP专用承载来承载其 VoIP数据流, 有利于保持 UE域切换的语音 连续性。
实施例八
为便于理解, 下面以 UE-1从 2G/3G网络切换到 LTE网络的过程为例, 对本 发明实施例的方案进行进一步详细的描述。
本实施例在 UE-1的 CS to PS切换过程中, MME触发建立 UE-1、 eNB和 MGW之间的 VoIP专用承载, 由 MGW转发 UE- 1的上下行 VoIP数据包。
参见图 8, 具体可以包括:
801、 UE-1进行 CS语音通话;
802、 RNS/BSS发起切换过程, 向拜访 MSC发送对应 UE-1的 CS到 PS切换 请求消息;
其中, 拜访 MSC是距离目标网络( LTE网络)较近的 MSC , 拜访 MSC和 UE-1的服务 MSC可能是同一个 MSC, 也可能是不同的 MSC。 拜访 MSC支持反 向单一无线语音呼叫连续性( SRVCC, Single Radio Voice Call Continuity )。 若 拜访 MSC不是 UE-1当前的服务 MSC ( serving MSC ), 则拜访 MSC可根据不同 的策略自行发起 UE-1的 CS到 PS切换; 或者, 也可以由 UE的服务 MSC发起对 应 UE-1的 CS到 PS切换。
其中, 若由 UE-1的服务 MSC进行 CS到 PS切换, 则该服务 MSC需要支持反 向 SRVCC, 在实际应用中, 若拜访 MSC并非 UE-1当前的服务 MSC C, 则 UE-1 的服务 MSC发起对应 UE-1的 CS到 PS切换流程可以包括:拜访 MSC向 UE-1的服 务 MSC发送 MAP— SUB— HANDOVER消息; UE- 1的服务 MSC进一步向 MME发 起 CS到 PS的切换流程。 本实施例中主要以拜访 MSC (以下简称为 MSC )发起 对应 UE-1的 CS到 PS切换为例进行说明。可以理解,若由拜访 MSC直接向 MME 发起 CS到 PS切换, 则可以避免对服务 MSC进行升级, 从而只需要对与 LTE相 邻的 MSC进行升级, 这样有利于节约成本。
803、 MSC向 MME发送对应 UE-1的 CS到 PS切换请求消息;
在一种应用场景下, MSC向 MME发送的对应 UE-1的 CS到 PS切换请求消 息可以携带如下信息的一个或多个: CS域的 CKCS和 IKCS、 KSIMSC、 MGW 的地址、端口、 UE在 PS使用的 CodeC,以及 MGW为 VoIP专用承载准备的 GTP-U 隧道的 IP地址和 TEID信息。
其中, UE-1在 PS使用的 CodeC, 可以在 UE-1支持的 PS域的 CodeC和 MGW 支持的 CodeC中选择一个公共的 CodeC, 而该 CodeC可以在 UE-1的 Attach流程、 Setup过程或 LAU过程中上 4艮给 MGW。
804、 MME接收 MSC发送的 UE-1的 CS到 PS切换请求, MME向 eNB发起切 换请求流程, 向 eNB发送对应 UE-1的切换请求消息, 指示 eNB为 UE-1准备切 换资源, 并触发建立 eNB和 MGW之间的 VoIP专用承载;
其中, CS到 PS切换请求携带 MGW的地址、 MGW为 VoIP专用承载准备的 GTP-U隧道的 IP地址和 TEID等信息。
进一步的,若 MME还收到 CS域和 PS域的密钥, MME可产生 NONCE参数, 并可选择 CS密钥作为 LTE密钥推演的根密钥, 推演出 LTE密钥, 并可进一步通 知 UE利用 CS密钥进行 LTE密钥推演, 例如可在切换命令中用 KSIMSC指示 UE 利用 CS密钥进行 LTE密钥推演。
进一步的, MME接收到来自 MSC的 UE-1的 CS到 PS切换请求消息, 可先 向 HSS发起位置更新流程, 判断 UE-1在 LTE网络是否有签约信息, 若有, 则再 触发建立 eBN和 MGW之间的 VoIP专用承载; 若无, 则可终止切换流程。
805、 eNB接收来自 MME的 UE-1的切换请求消息 , 进一步保存 MGW的地 址、 MGW的 GTP-U TEID等信息, 并向 MME反馈切换请求确认消息, 该消息 中可携带 eNB为 UE-1准备的切换资源信息、 UE-1的地址、 eNB为 VoIP专用承 载准备的 GTP-U隧道的 IP地址和 TEID等信息。
806、 MME向 MSC发送对应 UE-1的 CS到 PS切换响应消息,其中可携带 eNB 为 UE-1准备的切换资源信息、 eNB为 VoIP专用承载准备的 GTP-U隧道的 IP地址 和 TEID等信息。
MSC将 eNB为 VoIP专用承载准备的 GTP-U隧道的 IP地址和 TEID等信息通 知给 MGW, MGW进一步保存 eNB为 VoIP专用承载准备的 GTP-U隧道的 IP地址 和 TEID等, 至此, eNB到 MGW对应 UE-1的 VoIP专用承载建立完成。
可以理解, 步骤 801 ~ 806介绍了 UE-1的 CS到 PS切换准备阶段, 下面介绍 UE-1的 CS到 PS切换执行阶段。 807、 MSC接收来自 MME的 UE-1的 CS到 PS切换响应消息, 并可通过 RNC 向 UE-1发送 CS到 PS切换命令, 指示 UE-1接入 eNB;
在一种应用场景下, RNC向 UE-1发送切换命令, 其中携带 eNB为 UE-1准 备的切换资源信息。
808、 UE-1接收切换命令, 接入到 eNB; UE-1可进一步向 eNB发送切换完 成消息; eNB接收来自 UE- 1的切换完成消息, 并向可进一步向 MME发送切换 完成消息, 向 MME通知 UE- 1切换完成;
809、 LTE网络和 UE可以通过多种方式来同步配置参数。
其中一种方式可以是: 由 MME向 UE-1下发如下参数的一个或多个: UE-1 的 IP地址、 特殊 APN、 TFT、 承载标识、 编解码格式、 打包间隔时间、 RTP净 荷类型、 MGW地址、 端口等参数。
在一种应用场景下, MME可以在 UE-1接入 LTE网络后, 向 UE-1发送非接 入层( NAS , Non- Access Statun )消息, 在该 NAS消息中携带上述 VoIP会话参 数, 将上述 VoIP会话参数通知给 UE-1 , UE-1通过接收解析该 NAS消息, 获知 VoIP会话参数, 并进行配置; 或者, MME也可在向 eNB发送的切换请求携带 上述 VoIP会话参数; 由 eNB封装在 container中发送给 RNS/BSS, 而 RNS/BSS可 将其携带在切换命令中通知给 UE-1 , UE-1据此实现和 LTE网络同步 VoIP会话 参数。
方式二可以是: UE-1和 MGW各自使用默认的 VoIP会话参数配置 VoIP专用 承载。 例如, UE-1固定使用某个私有地址和端口来承载 VOIP流, MGW的地 址固定使用另一个私有地址和端口来承载 VOIP流, UE-1根据这些地址和端口 来生成 TFT。 RTP净荷类型也可以按照默认值设置, 编解码格式可以釆用 AMR (可变多速率语音格式 ), 打包间隔等参数也釆用默认值。
810、若 UE-1接收到 MME下发的 VoIP会话参数, 在本地创建例如 APN、 IP 地址、 端口、 TFT等配置参数, 并可进一步向 MME回复响应。
在本地 VoIP会话参数配置完成后, UE便可接收和发送 VOIP数据流; 此外, 若 MME不向 UE-1下发 VoIP会话参数, UE-1可以使用默认参数进行 本地 VoIP专用承载配置。
进一步的, 若 UE-1还没有在 EPC附着, MME可向 HSS发送位置更新请求 消息, 发起位置更新, 从 HSS获取 UE-1的相关签约数据; 或者, 也可由 UE-1 执行一个附着 (attach ) 流程来完成相关签约数据的获取。
此时, UE-1的 VoIP上行数据的传送路径为 UE-1 - >eNB - >MGW; UE-1 的 VoIP下行数据的传送路径为 MGW - >eNB - > UE-1;
进一步的, 若 UE- 1在源网络( 2G/3 G ) 的通话为视频通话, 则 MME还可 以进一步触发建立 eNB和 MGW之间对应 UE-1视频专用承载, 其中, 视频专用 承载用于承载 UE-1接入目标接入网后与 MGW之间的视频会话。视频专用承载 的建立方式于 VoIP专用承载的建立方式类似。
当然, 也可以只将 UE-1在源网络的视频通话中的语音部分映射到目标网 络, 此时则可以只建立 VoIP专用承载, 而可不建立视频专用承载。
811、 若 UE-1此前没有在 IMS注册过, 则 UE-1发起 IMS注册, 发起 IMS域 转换流程;
812、 在完成 IMS域转换过程后, IMS可指示 MSC/MGW释放 UE-1的相应 会话;
其中, 在域转换完成后, UE-1在 LTE网络建立新的承载;
UE-1的 VoIP上行数据的传送路径为 UE-1 - >eNB - >SGW - >PGW;
UE-1的 VoIP下行数据传送路径为 PGW - >SGW - >eNB - > UE-1;
813、 MSC/MGW向 MME发送删除承载请求, 发起承载释放, 触发释放域 转换前建立的 eNB和 MGW间对应 UE-1的 VOIP专用承载;
814、 MME向 eNB发送承载释放命令,指示 eNB删除域转换前建立的 MGW 和 eNB之间对应 UE-1的 VoIP专用承载;
815、 eNB接收来自 MME的承载释放命令,删除在 UE- 1域转换前建立的相 应承载 , eNB和 UE-1进行 RRC连接重配置;
816、 eNB向 MME发送承载释放响应。
由上可以看出, 本实施例可以实现 UE从 CS域切换到 PS域, 并且在 CS到 PS切换过程中 , MME触发建立 eNB和 MGW之间 , 进而可以在 UE切换到目标 网络后, 将其在 CS域的语音业务快速映射为目标网络的 VoIP会话, 利用建立 的 VoIP专用承载来承载其 VoIP数据流, 有利于保持 UE域切换的语音连续性。
进一步的, 在切换完成后, UE可进一步进行 IMS域转换, 可在保持 UE域 切换的语音连续性的同时, 简化 VoIP数据的承载方式。 为便于更好的实施本发明实施例的技术方案, 本发明实施例还提供相应 的装置和通信系统。
参见图 9, 本发明实施例的一种移动性管理实体 900, 可包括: 第一接收 模块 910、 第一专用承载触发模块 920、 第一发送模块 930和第二发送模块 940。
其中, 第一接收模块 910, 用于接收来自 MSC的对应第一 UE的 CS到 PS切 换请求消息;
第一专用承载触发模块 920 , 用于触发建立服务网关 SGW和媒体网关 MGW之间对应第一 UE的网际协议语音 VoIP专用承载, 或者, 触发建立 SGW 和分组数据网关 PGW之间对应第一 UE的 VoIP专用承载;
第一发送模块 930, 用于向目标接入网发送切换请求消息, 指示该目标接 入网为第一 UE准备切换资源;
第二发送模块 940, 用于向上述 MSC发送对应第一 UE的 CS到 PS切换响应 消息,上述 CS到 PS切换响应消息携带上述目标接入网为第一 UE准备的切换资 源, 以使得第一 UE在切换到上述目标接入网后, 使用上述 VoIP专用承载来承 载第一 UE与上述 MGW之间的 VoIP会话。
在一种应用场景下,第一接收模块 910接收的 CS到分组交换域 PS切换请求 消息携带有 MGW的地址信息;
移动性管理实体 900还可包括:
第一默认承载触发模块,用于向 SGW发送携带 MGW地址信息的建立会话 消息, 触发 SGW向 MGW发送建立会话消息, 以建立 SGW和 MGW之间对应第 一 UE的默认承载;
或者,
第二默认承载触发模块, 用于向上述 SGW发送建立会话消息, 触发上述 SGW向 PGW发送建立会话消息, 以建立上述 SGW和上述 PGW之间对应第一 UE的默认承载;
第一专用承载触发模块 920, 可以包括:
第一专用承载触发子模块, 用于在 SGW和 MGW之间对应第一 UE的默认 承载建立后, 触发 MGW向 SGW发送建立承载消息, 以建立 SGW和 MGW之间 对应第一 UE的 VoIP专用承载; 或者,
第二专用承载触发子模块, 用于在 SGW和 MGW之间对应第一 UE的默认 承载建立后, 向 SGW发送承载资源命令消息, 触发 SGW发送承载资源命令消 息给 MGW, 以建立 SGW和 MGW之间对应第一 UE的 VoIP专用承载;
或者,
第三专用承载触发子模块,用于在 SGW和 PGW之间对应第一 UE的默认承 载建立后, 向 SGW发送请求承载资源命令消息, 触发 SGW向 PGW发送承载资 源命令消息, 以建立 SGW和 PGW之间对应第一 UE的 VoIP专用承载。
在一种应用场景下, 移动性管理实体 700还可包括:
下发模块, 用于向第一 UE下发 VoIP会话参数。
在一种应用场景下, 下发模块, 可以包括:
第一下发子模块, 用于通过非接入层信令向第一 UE下发 VoIP会话参数; 或者,
第二下发子模块, 用于将 VoIP会话参数下发给上述目标接入网, 以便上 述目标接入网将该 VoIP会话参数封装在透明容器中返回给源接入网 (例如 RNC ) , 源接入网通过切换命令将 VoIP会话参数下发给第一 UE。
在一种应用场景下,若 PS域网络为长期演进 LTE网络,移动性管理实体 700 还可包括:
密钥推演模块, 用于获取 CS密钥, 利用上述 CS密钥推演出长期演进 LTE 网络密钥;
密钥下发模块, 用于将 LTE网络密钥通知给第一 UE, 或将用于派生 LTE 网络密钥的参数通知给第一 UE。 该参数可以为 CS密钥。
可以理解, 本实施例的移动性管理实体 900各个功能模块的功能可根据上 述相应方法实施例中的方法具体实现, 其具体实施方式可参照上述方法实施 例的中相关描述, 此处不再赘述。 参见图 10, 本发明实施例的一种用户设备 1000, 可以包括:
第二接收模块 1010 , 用于接收源接入网下发的切换命令, 上述切换命令 携带目标接入网为上述用户设备 UE准备的切换资源信息;
切换模块 1020, 用于接入上述目标接入网;
参数配置模块 1030 , 用于配置 VoIP专用承载的 VoIP会话参数, 以便利用 该 VoIP专用承载来承载上述 UE与 MGW之间的 VoIP会话。
在一种应用场景下, 参数配置模块 1030具体可以用于, 利用 MME下发的 VoIP会话配置参数进行参数配置; 或者, 利用本地默认的 VoIP会话参数进行 参数配置。
可以理解, 本实施例的用户设备 1000各个功能模块的功能可根据上述相 应方法实施例中的方法具体实现, 其具体实施方式可参照上述方法实施例的 中相关描述, 此处不再赘述。 参见图 11 , 本发明实施例的一种移动性管理实体 1100, 可以包括: 第三接收模块 1110 ,用于接收来自 MSC的对应第一 UE的 CS到 PS切换请求 消息, 以及来自 SGSN的对应第一 UE的 PS切换请求消息;
第三发送模块 1120, 向目标接入网发送切换请求消息, 指示上述目标接 入网为第一 UE准备对应来自 SGSN的 PS切换请求消息的切换资源;
第四发送模块 1130,用于向上述 MSC发送对应第一 UE的 CS到 PS切换响应 消息, 并向上述 SGSN发送对应第一 UE的 PS切换响应消息, 以便上述 MSC和 / 或 SGSN指示 UE接入上述目标接入网;
第二专用承载触发模块 1140, 用于在第一 UE切换完成后, 触发建立 SGW 和 MGW之间对应第一 UE的网际协议语音 VoIP专用承载, 或, 触发建立 SGW 和 PGW之间对应第一 UE的 VoIP专用承载,以使得第一 UE在切换到目标接入网 后, 使用该 VoIP专用承载来承载第一 UE与 MGW之间的 VoIP会话。
可以理解, 本实施例的移动性管理实体 1100各个功能模块的功能可根据 上述相应方法实施例中的方法具体实现, 其具体实施方式可参照上述方法实 施例的中相关描述, 此处不再赘述。 参见图 12, 本发明实施例的一种用户设备 1200, 包括:
第四接收模块 1210 , 用于接收源接入网下发的切换命令, 上述切换命令 携带目标接入网为上述用户设备 UE准备的切换资源信息;
切换模块 1220, 用于接入上述目标接入网;
第三触发模块 1230, 用于在用户设备 UE 1200切换完成后, 触发建立服务 网关 SGW和媒体网关 MGW之间对应上述 UE的网际协议语音 VoIP专用承载, 或者触发建立 SGW和 PGW之间对应上述 UE的 VoIP专用承载;
参数配置模块 1240 , 用于配置上述 VoIP专用承载的 VoIP会话参数, 以便 利用上述 VoIP专用承载来承载上述 UE与上述 MGW之间的 VoIP会话。
可以理解, 本实施例的用户设备 1200各个功能模块的功能可根据上述相 应方法实施例中的方法具体实现, 其具体实施方式可参照上述方法实施例的 中相关描述, 此处不再赘述。 参见图 13 , 本发明实施例的一种移动性管理实体 1300, 包括:
第五接收模块 1310,用于接收来自 MSC的对应第一 UE的 CS到 PS切换请求 消息, 上述 CS到 PS切换请求消息携带 MGW为第一 UE的 VoIP专用承载准备的
GTP-U隧道;
第四触发模块 1320 , 用于向目标接入网发送切换请求消息, 上述切换请 求消息携带上述 MGW为第一 UE的 VoIP专用承载准备的 GTP-U隧道,指示上述 目标接入网为第一 UE准备切换资源,并触发建立上述目标接入网和 MGW之间 对应第一 UE的 VoIP专用承载;
第五发送模块 1330,用于向上述 MSC发送对应第一 UE的 CS到 PS切换响应 消息,上述 CS到 PS切换响应消息携带上述目标接入网为第一 UE准备的切换资 源、 以及上述目标接入网为第一 UE的 VoIP专用承载准备的 GTP-U隧道, 以使 得第一 UE在切换到上述目标接入网后,使用上述 VoIP专用承载来承载第一 UE 与上述 MGW之间的 VoIP会话。
可以理解, 本实施例移动性管理实体 1300各个功能模块的功能可根据上 述相应方法实施例中的方法具体实现, 其具体实施方式可参照上述方法实施 例的中相关描述, 此处不再赘述。
本发明实施例还提供一种通信系统, 其特征在于, 包括:
移动性管理实体 900、用户设备 1000、移动性管理实体 1100、用户设备 1200 或移动性管理实体 1300。 本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步 骤是可以通过程序来指令相关的硬件来完成, 该程序可以存储于一计算机可 读存储介质中, 存储介质可以包括: 只读存储器、 随机存储器、 磁盘或光盘 等。
以上对本发明实施例所提供的电路交换域到分组交换域的切换方法和设 备及通信系统进行了详细介绍, 本文中应用了具体个例对本发明的原理及实 施方式进行了阐述, 以上实施例的说明只是用于帮助理解本发明的方法及其 核心思想; 同时, 对于本领域的一般技术人员, 依据本发明的思想, 在具体 实施方式及应用范围上均会有改变之处, 综上, 本说明书内容不应理解为对 本发明的限制。

Claims

权 利 要求 书
1、 一种电路交换域到分组交换域的切换方法, 其特征在于, 包括: 目标移动性管理实体接收来自移动交换中心 MSC的对应用户设备 UE的 电路交换域 CS到分组交换域 PS切换请求消息;
所述目标移动性管理实体根据所述 CS到 PS切换请求消息触发建立服务网 关 SGW和媒体网关 MGW之间对应所述 UE的网际协议语音 VoIP专用承载, 或 者, 触发建立所述 SGW和分组数据网关 PGW之间对应所述 UE的 VoIP专用承 载;
所述目标移动性管理实体向目标接入网发送切换请求消息以指示所述目 标接入网为所述 UE准备切换资源; 应消息,所述 CS到 PS切换响应消息携带所述目标接入网为所述 UE准备的切换 资源, 以使得所述 UE利用所述切换资源切换到所述目标接入网,
所述 VoIP专用承载用于所述 UE切换到所述目标接入网后承载所述 UE与 所述 MGW之间的 VoIP会话。
2、 根据权利要求 1所述的方法, 其特征在于, 如果触发建立的是所述服 务网关 SGW和媒体网关 MGW之间对应所述 UE的网际协议语音 VoIP专用承 载,则所述 CS到分组交换域 PS切换请求消息携带有所述 MGW的地址信息,且 所述方法还包括:
所述目标移动性管理实体向所述 SGW发送携带所述 MGW地址信息的建 立会话消息, 以触发所述 SGW向所述 MGW发送建立会话消息, 以建立所述 SGW和 MGW之间对应所述 UE的默认承载,
所述根据所述 CS到 PS切换请求消息触发建立所述 SGW和 MGW之间对应 所述 UE的 VoIP专用承载, 包括:
在所述 SGW和所述 MGW之间对应所述 UE的默认承载建立后, 所述目标 移动性管理实体根据所述 CS到 PS切换请求消息触发所述 MGW向所述 SGW发 送建立承载消息, 以建立所述 SGW和所述 MGW之间对应 UE的 VoIP专用承载, 或者,
在所述 SGW和所述 MGW之间对应所述 UE的默认承载建立后, 所述目标 移动性管理实体根据所述 CS到 PS切换请求消息向所述 SGW发送承载资源命 令消息以触发所述 SGW发送承载资源命令消息给所述 MGW, 以建立所述 SGW和所述 MGW之间对应 UE的 VoIP专用承载。
3、 根据权利要求 1所述的方法, 其特征在于,
所述方法还包括:
所述目标移动性管理实体向所述 SGW发送建立会话消息以触发所述 SGW向所述 PGW发送建立会话消息,以建立所述 SGW和所述 PGW之间对应所 述 UE的默认承载;
所述根据所述 CS到 PS切换请求消息触发建立 SGW和 PGW之间对应所述 UE的 VoIP专用承载, 包括:
在所述 SGW和所述 PGW之间对应 UE的默认承载建立后,所述目标移动性 管理实体根据所述 CS到 PS切换请求消息向所述 SGW发送请求承载资源命令 消息以触发所述 SGW向所述 PGW发送承载资源命令消息,以建立所述 SGW和 所述 PGW之间对应所述 UE的 VoIP专用承载。
4、 根据权利要求 1至 3任一项权利要求所述的方法, 其特征在于, 所述方 法还包括:
在触发建立 SGW和 MGW之间对应所述 UE的 VoIP专用承载时, 所述目标 移动性管理实体触发建立所述 SGW和所述 MGW之间对应所述 UE的视频专用 承载, 或者, 在触发建立 SGW和 PGW之间对应 UE的 VoIP专用承载时, 触发建 立所述 SGW和所述 PGW之间对应 UE的视频专用承载,
所述视频专用承载用于承载所述 UE与所述 MGW之间的视频会话。
5、 根据权利要求 1至 4任一项权利要求所述的方法, 其特征在于, 所述方法还包括:
所述目标移动性管理实体通过非接入层信令向所述 UE下发 VoIP会话参 数;
或者, 所述目标接入网将所述 VoIP会话参数封装在透明容器中返回给源接入网, 所 述源接入网通过切换命令将所述 VoIP会话参数下发给所述 UE。
6、 根据权利要求 1至 5任一项权利要求所述的方法, 其特征在于, 若 PS域 网络为长期演进 LTE网络;
所述方法还包括:
所述目标移动性管理实体获取 CS密钥, 利用所述 CS密钥推演出长期演进 LTE网络密钥;
所述目标移动性管理实体将所述 LTE网络密钥通知给所述 UE, 或将用于 推演所述 LTE网络密钥的 CS密钥通知给所述 UE。
7、 根据权利要求 1至 6任一项权利要求所述的方法, 其特征在于, 所述方 法还包括:
所述 UE在切换到所述目标接入网后, 利用所述目标移动性管理实体下发 的 VoIP会话参数或利用所述 UE默认的 VoIP会话参数, 配置所述 VoIP专用承载 的 VoIP会话参数, 以便利用所述 VoIP专用承载来承载所述 UE与 MGW之间的 VoIP会话。
8、 根据权利要求 1至 7任一项权利要求所述的方法, 其特征在于, 所述方 法还包括:
所述 UE在切换到所述目标接入网后, 发起网际协议多媒体系统 IMS会话 域转换, 以将所述 VoIP会话转换到 IMS域。
9、 一种电路交换域到分组交换域的切换方法, 其特征在于, 包括: 目标移动性管理实体接收来自移动交换中心 MSC的对应用户设备 UE的 CS到 PS切换请求消息, 以及来自源网络 SGSN的对应所述 UE的 PS切换请求消 息;
目标移动性管理实体向目标接入网发送切换请求消息, 指示所述目标接 入网为所述 UE准备对应所述来自所述 SGSN的 PS切换请求消息的切换资源; 息, 并向所述 SGSN发送对应所述 UE的 PS切换响应消息, 所述 CS到 PS切换响 应消息携带所述切换资源;
在 UE利用所述切换资源切换到所述目标接入网后, 目标移动性管理实体 触发建立 SGW和 MGW之间对应 UE的网际协议语音 VoIP专用承载 , 或者, 触 发建立 SGW和 PGW之间对应 UE的 VoIP专用承载, 以使得所述 UE在切换到所 述目标接入网后, 使用所述 VoIP专用承载来承载所述 UE与所述 MGW之间的 VoIP会话。
10、 一种电路交换域到分组交换域的切换方法, 其特征在于, 包括: 用户设备 UE接收源接入网下发的切换命令, 所述切换命令携带目标接入 网为所述 UE准备的切换资源信息;
所述 UE接入所述目标接入网;
在所述 UE接入所述目标接入网后 , 所述 UE触发建立 SGW和 MGW之间对 应 UE的 VoIP专用承载, 或者触发建立 SGW和 PGW之间对应 UE的 VoIP专用承 载;
所述 UE配置所述 VoIP专用承载的 VoIP会话参数, 以便利用所述 VoIP专用 承载来承载 UE与所述 MGW之间的 VoIP会话。
11、 一种电路交换域到分组交换域的切换方法, 其特征在于, 包括: 目标移动性管理实体接收来自 MSC的对应 UE的 CS到 PS切换请求消息,所 述 CS到 PS切换请求消息携带 MGW为所述 UE的 VoIP专用承载准备的 GTP-U隧 道;
所述目标移动性管理实体向目标接入网发送切换请求消息, 所述切换请 求消息携带所述 MGW为 UE的 VoIP专用承载准备的 GTP-U隧道,以指示所述目 标接入网为所述 UE准备切换资源, 并触发所述目标接入网建立所述目标接入 网和 MGW之间对应所述 UE的 VoIP专用承载; 应消息,所述 CS到 PS切换响应消息携带所述目标接入网为所述 UE准备的切换 资源以及所述目标接入网为 UE的 VoIP专用承载准备的 GTP-U隧道, 以使得所 述 UE在利用所述切换资源切换到所述目标接入网后, 使用所述 VoIP专用承载 来承载所述 UE与所述 MGW之间的 VoIP会话。
12、 一种移动性管理实体, 其特征在于, 包括:
第一接收模块,用于接收来自移动交换中心 MSC的对应所述 UE的 CS到 PS 切换请求消息;
第一专用承载触发模块, 用于根据所述 CS到 PS切换请求消息触发建立所 述服务网关 SGW和媒体网关 MGW之间对应所述 UE的网际协议语音 VoIP专用 承载, 或者, 触发建立所述 SGW和分组数据网关 PGW之间对应所述 UE的 VoIP 专用承载;
第一发送模块, 用于向目标接入网发送切换请求消息以指示所述目标接 入网为所述 UE准备切换资源;
第二发送模块, 用于向所述 MSC发送对应所述 UE的 CS到 PS切换响应消 息, 所述 CS到 PS切换响应消息携带所述目标接入网为所述 UE准备的切换资 源, 以使得 UE利用所述切换资源切换到所述目标接入网; 其中, 所述 VoIP专 用承载用于在所述 UE切换到所述目标接入网后承载所述 UE与所述 MGW之间 的 VoIP会话。
13、 根据权利要求 12所述的移动性管理实体, 其特征在于, 所述第一接 收模块接收的 CS到 PS切换请求消息携带有 MGW的地址信息;
所述移动性管理实体还包括:
第一默认承载触发模块,用于向所述 SGW发送携带所述 MGW地址信息的 建立会话消息, 触发所述 SGW向所述 MGW发送建立会话消息, 以建立 SGW 和 MGW之间对应所述 UE的默认 7 载;
所述第一专用承载触发模块, 包括:
第一专用承载触发子模块, 用于在所述 SGW和所述 MGW之间对应 UE的 默认承载建立后,触发所述 MGW向所述 SGW发送建立承载消息, 以建立所述 SGW和所述 MGW之间对应所述 UE的 VoIP专用承载;
或者,
第二专用承载触发子模块, 用于在所述 SGW和所述 MGW之间对应 UE的 默认承载建立后, 向所述 SGW发送承载资源命令消息, 触发所述 SGW发送承 载资源命令消息给所述 MGW,以建立所述 SGW和所述 MGW之间对应所述 UE 的 VoIP专用承载;
14、 根据权利要求 12所述的移动性管理实体, 其特征在于,
所述移动性管理实体还包括:
第二默认承载触发模块, 用于向所述 SGW发送建立会话消息, 触发所述 SGW向 PGW发送建立会话消息, 以建立所述 SGW和所述 PGW之间对应所述 UE的默认承载; 所述第一专用承载触发模块, 包括:
第三专用承载触发子模块,用于在所述 SGW和所述 PGW之间对应所述 UE 的默认承载建立后, 向所述 SGW发送请求承载资源命令消息, 触发所述 SGW 向所述 PGW发送承载资源命令消息, 以建立所述 SGW和所述 PGW之间对应所 述 UE的 VoIP专用承载。
15、 一种移动性管理实体, 其特征在于, 包括:
第三接收模块, 用于接收来自 MSC的对应 UE的 CS到 PS切换请求消息, 以 及来自源网络的 SGSN的对应 UE的 PS切换请求消息;
第三发送模块, 用于向目标接入网发送切换请求消息, 指示所述目标接 入网为 UE准备对应来自所述 SGSN的 PS切换请求消息的切换资源;
第四发送模块, 用于向所述 MSC发送对应 UE的 CS到 PS切换响应消息, 并 向所述 SGSN发送对应 UE的 PS切换响应消息, 所述 CS到 PS切换响应消息携带 所述切换资源;
第二专用承载触发模块, 用于在 UE利用所述切换资源切换到所述目标接 入网后, 触发建立 SGW和 MGW之间对应 UE的网际协议语音 VoIP专用承载 , 或, 触发建立 SGW和 PGW之间对应 UE的 VoIP专用承载, 以使得 UE在切换到 所述目标接入网后,使用所述 VoIP专用承载来承载 UE与所述 MGW之间的 VoIP 会话。
16、 一种用户设备, 其特征在于, 包括:
第四接收模块, 用于接收源接入网下发的切换命令, 所述切换命令携带 目标接入网为所述用户设备 UE准备的切换资源信息;
切换模块, 用于接入所述目标接入网;
第三触发模块, 用于在所述用户设备 UE接入所述目标接入网后, 触发建 立 SGW和媒体网关 MGW之间对应所述 UE的 VoIP专用承载, 或者触发建立 SGW和 PGW之间对应所述 UE的 VoIP专用承载;
参数配置模块, 用于配置所述 VoIP专用承载的 VoIP会话参数, 以便利用 所述 VoIP专用承载来承载所述 UE与所述 MGW之间的 VoIP会话。
17、 一种移动性管理实体, 其特征在于, 包括:
第五接收模块, 用于接收来自 MSC的对应 UE的 CS到 PS切换请求消息, 所 述 CS到 PS切换请求消息携带 MGW为所述 UE的 VoIP专用承载准备的 GTP-U隧 道;
第四触发模块, 用于向目标接入网发送切换请求消息, 所述切换请求消 息携带所述 MGW为所述 UE的 VoIP专用承载准备的 GTP-U隧道,以指示所述目 标接入网为 UE准备切换资源, 并触发所述目标接入网建立所述目标接入网和 MGW之间对应 UE的 VoIP专用承载;
第五发送模块, 用于向所述 MSC发送对应所述 UE的 CS到 PS切换响应消 息,所述 CS到 PS切换响应消息携带所述目标接入网为所述 UE准备的切换资源 以及所述目标接入网为 UE的 VoIP专用承载准备的 GTP-U隧道, 以使得所述 UE 在利用所述切换资源切换到所述目标接入网后, 使用所述 VoIP专用承载来承 载所述 UE与所述 MGW之间的 VoIP会话。
18、 一种通信系统, 其特征在于, 包括:
如权利要求 12至 17任一项所述的装置。
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