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WO2008125067A1 - Procédé et dispositif permettant d'assurer la continuité de données vocales au cours d'une session - Google Patents

Procédé et dispositif permettant d'assurer la continuité de données vocales au cours d'une session Download PDF

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Publication number
WO2008125067A1
WO2008125067A1 PCT/CN2008/070746 CN2008070746W WO2008125067A1 WO 2008125067 A1 WO2008125067 A1 WO 2008125067A1 CN 2008070746 W CN2008070746 W CN 2008070746W WO 2008125067 A1 WO2008125067 A1 WO 2008125067A1
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WIPO (PCT)
Prior art keywords
network
session
domain
bearer
voice
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2008/070746
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English (en)
Chinese (zh)
Inventor
Xiaobo Wu
Patrice Hede
Jian Zhang
Yungui Wang
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN2007101027622A external-priority patent/CN101291453B/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2008125067A1 publication Critical patent/WO2008125067A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for implementing voice continuity of a session. Background of the invention
  • SAE/LTE System Architecture Evolution/Long Term Evolution
  • SAE/LTE networks have covered some urban areas and traffic hotspots, resulting in SAE in current communication networks.
  • /LTE network and 2G/3G (2rd Generation/3rd Generation, second generation mobile communication technology/third generation mobile communication technology) network coexist.
  • the user who initiates the call may cross the two networks during a call.
  • the switch between the SAE/LTE network and the 2G/3G network is required.
  • the SAE/LTE network can only carry voice transmissions on the PS (Packet Service) domain.
  • the BIS IP Multimedia Subsystem
  • the voice service is generally referred to as VoIP in the SAE/LTE network.
  • VoIP Voice over IP, voice over IP
  • 2G/3G networks due to lack of support for VoIP voice services, voice services are generally carried in CS TDM (Circuit System Time Division Multiplexing, circuit domain). Time division multiplexing).
  • 2G/3G networks can be seen as a comprehensive coverage to some extent, due to the differences in deployment between SAE/LTE networks and 2G/3G networks, plus in different networks, mobile communications.
  • the service bearer mechanism is different.
  • the UE User Equipment
  • the B1S voice service is interrupted, the continuity of the voice service of the user may be affected.
  • the SRV Single Radio Voice Call Continuity between IMS and CS
  • the technical solution solves the problem of carrying the bearer in SAE/LTE.
  • the premise of the SRV technical solution is that the terminal cannot receive and transmit data simultaneously in the SAE/LTE network and the 2G/3G network or other 3GPP networks.
  • the SRV scheme is based on inter-MSC handover (inter-MSC handover), MME (Mobility) in SAE/LTE networks.
  • the Management Entity Mobility Management Entity is emulated as an MSC (Mobile Switch Center).
  • MSC Mobile Switch Center
  • E interface between the MME and the MSC to simulate the handover between MSCs, thus the SAE/LTE network.
  • FIG. 1 is a schematic diagram of a UE in an SAE/LTE network.
  • the UE obtains an IP connection through the SAE/LTE network and registers with the B1S network.
  • the UE has a top S voice call.
  • the top S signaling and the VoIP voice service are both Hosted in the SAE/LTE PS domain.
  • the VoIP voice service bearer can be transferred to the 2G/3G CS domain through the switching from the PS domain to the CS (Circuit Service) domain, and the Serving/PDN SAE Gateway (Service/Packet Data Network System Evolution Network Gateway) acts as the endpoint of SIP (Session Initiation Protocol) signaling and data.
  • P-CSCF Proxy-Call Session Control Function
  • the proxy call session controller must perform SIP registration (ie, register with the MS) as a UE proxy.
  • the Serving/PDN SAE Gateway After switching from the SAE/LTE network to the 2G/3G CS domain, the Serving/PDN SAE Gateway also needs to have the ISUP (ISDN User Part) signaling capability to convert the SIP signaling into the corresponding content;
  • the 2G/3G network needs to be upgraded to switch back from the 2G/3G network.
  • SAE/LTE network As shown in FIG. 2, it is a schematic diagram of switching an existing UE from a SAE/LTE network to a 2G/3G network.
  • the GSM (Global System for Mobile Communications) network in the 2G network is used as an example to illustrate the handover process between the SAE/LET network and the GSM network.
  • FIG. 3 shows the flow chart of switching from the SAE/LTE network to the GSM network.
  • the specific steps are as follows: 3-1.
  • the session may require a VCCXVoice Call Continuity) switch;
  • the top S voice session is performed between the UE and the Serving/PDN SAE Gateway/MGW, and the VoIP voice service data is transmitted on the RTP (Real Time Transport Protocol) stream;
  • RTP Real Time Transport Protocol
  • the related neighboring GSM cell is sent to the UE through the "neighbor cell list", and then the UE reports the measurement report to the eNodeB;
  • the eNodeB determines, according to the received UE measurement report, which GSM CS domain is switched from the SAE/LTE network, and the eNodeB sends a request message for switching from the SAE/LTE network to the GSM CS domain to ⁇ E;
  • the MME After receiving the handover message, the MME initiates a basic inter-MSC handover (inter-MSC handover); Since the MME is to emulate an anchor MSC, so MSC-S / MGW (Mobile Switch Center-Server / Media Gateway, a mobile switching center server / media gateway) does not know the MME is initiated inter-MSC handover 0 in the establishment of MSC- When the S/MGW and the Serving/PDN SAE Gateway inter-office link, the Serving/PDN SAE Gateway is treated as the MGW accordingly;
  • the MME sends an encryption key request to the MSC-S/MGW (top SI: International Mobile Subscriber)
  • the MSC-S/MGW returns a response to the MME, and the response message includes an encryption key or an "unknown portion"; 3-7. After the encryption key is determined, the MME carries the encryption key in the preparation handover request message. Sent to MSC-S;
  • GSM BSC Base Station Controller
  • MSC-S Mobile Switching Center Server
  • the MME regards the Serving/PDN SAE Gateway as an MGW, and establishes a link between the Serving/PDN SAE Gateway and the MSC-S/MGW.
  • the MME sends a handover command to the eNodeB, and the eNodeB forwards the message to the UE.
  • the handover command instructs the UE to switch from the PS domain to the CS domain and uses the correct encryption key;
  • the UE accesses the target cell, and the UE sends a handover complete message by using the MSC-S.
  • the MSC-S forwards the handover complete message to the MME.
  • the called MSC sends an "ANSWER" message to the calling MSC, at which time the link between the calling party and the called party is connected;
  • the MME notifies the Serving/PDN SAE Gateway to activate the user plane and notify the PCRF;
  • the MME notifies the eNodeB to release the original SAE/LTE network radio resources
  • the MME will notify the Serving/PDN SAE Gateway, and steps 3-17 to 3-21 will not be executed;
  • the Serving/PDN SAE Gateway sends a link update message to the PCRF.
  • the Serving/PDN SAE Gateway notifies the PCRF top S voice session to be terminated in the Serving/PDN SAE Gateway, and the Serving/PDN SAE Gateway informs the PCRF of the IP address and port sent by the UE related SIP signaling;
  • the PCRF notifies the P-CSCF of the link update message
  • the PCRF returns a link update response to the Serving/PDN SAE Gateway.
  • the P-CSCF sends a re-invite (command to establish a session in the initial session protocol) message to the S_CSCF, notifies the Serving/PDN SAE Gateway to assign an IP address and port, and provides the assigned IP address and port to the subsequent VoIP voice.
  • a re-invite command to establish a session in the initial session protocol
  • the process of the UE switching from the SAE/LTE network to the GSM network can be completed through the foregoing steps, and the voice session is switched from the SAE/LTE network to the GSM CS domain through the handover from the PS domain to the CS domain to ensure the continuity of the voice service of the user.
  • the IMS network needs to be upgraded and modified, thus affecting the scope of application of the SRV technical solution.
  • the SRV technical solution can also be adopted to ensure the continuity of the voice service of the user. As shown in Figure 4, the following steps are taken for the existing subsequent handover from GSM to SAE/LTE network:
  • BSC Base Stat Analyzer
  • the MSC-S/MGW forwards the preparation for the subsequent handover request to the MME.
  • the MME parses the stored PS domain key, and sends a handover request to the eNodeB;
  • the eNodeB performs corresponding handover preparation, and sends a handover request response to the MME;
  • the MME notifies the Serving/PDN SAE Gateway to prepare the user plane;
  • the Serving/PDN SAE Gateway returns a preparation user plane response to the MME;
  • the Serving/PDN SAE Gateway sends a handover command to the BSC, and the BSC forwards the handover command to the UE; 4-8, the UE sends a handover complete message to the eNodeB, and the eNodeB forwards the handover complete message to the MME;
  • the MME instructs the Serving/PDN SAE Gateway to use the PS domain to transmit uplink user data and notify the PCRF.
  • the UE returns to the SAE/LTE network
  • the Serving/PDN SAE Gateway sends a bearer message required by the network to the UE, so that the SAE/LTE network establishes an IP bearer.
  • the UE sends a re-invite message to the P-CSCF, and the P-CSCF contacts the S_CSCF. At this point, the user plane data is re-terminated at the UE.
  • the user can complete the GSM network after upgrading the GSM network base station and the MSC.
  • the CS domain to the PS domain is switched, so as to ensure the continuity of the user voice service in the process of switching from the GSM network to the SAE/LTE network.
  • the prior art has the following problems: 1) After switching from the SAE/LTE network to the GSM CS domain, the Serving/PDN SAE Gateway is used as the termination point of SIP signaling and data, and the nis network needs to be modified and upgraded accordingly;
  • the MS network needs to be modified and upgraded accordingly.
  • IP-based services in the B1S network cannot be used normally because IP data cannot be transmitted normally.
  • Embodiments of the present invention provide a method and apparatus for implementing voice continuity of a session at a bearer level.
  • An embodiment of the present invention provides a method for implementing voice continuity of a session, including:
  • the session is a session that needs to maintain voice continuity.
  • the signaling bearer of the session is transferred to the packet service PS domain of the target network;
  • An embodiment of the present invention provides a method for implementing voice continuity of a session, including:
  • the session is a session that needs to maintain voice continuity, and receives a measurement report sent by the terminal;
  • An embodiment of the present invention provides a base station, including:
  • the determining module 1 is configured to determine whether the session needs to be switched
  • the processing module 1 is configured to: when the determining module determines that the session needs to be switched from the source network to the target network, transfer the signaling bearer of the session to the target network PS domain, and the voice data of the session The bearer is transferred to the target network CS domain.
  • An embodiment of the present invention provides an apparatus for implementing voice continuity of a session, including:
  • the determining module 2 is configured to determine whether the session needs to be switched
  • the processing module 2 is configured to: when the determining module 2 determines that the session needs to be switched from a source network to a target network And transferring the voice data bearer of the session to a PS domain of the target network or a CS domain of the target network, and transferring the signaling bearer of the session to a PS domain or a remote user agent of the target network.
  • the embodiment of the present invention keeps the entire process of voice continuity transparent to the service network, and ensures the continuity of the voice service of the session and the normal use of other services of the service network without upgrading and modifying the service network;
  • the handover from the target network to the source network may be used to trigger the subsequent voice data and the nis signaling to be switched back to the source network.
  • the PS handover process may also trigger the restart of other data services. Established, and, there is no need to upgrade the target network.
  • FIG. 1 is a schematic diagram of a UE in a SAE/LTE network
  • FIG. 2 is a schematic diagram of an existing handover from a SAE/LTE network to a 2G/3G network;
  • FIG. 3 is a schematic diagram of a process of switching from a SAE/LTE network to a 2G/3G network;
  • FIG. 4 is a schematic diagram of a current process of switching from a 2G/3G network to a SAE/LTE network;
  • FIG. 5 is a schematic diagram of switching from a SAE/LTE network to a 2G/3G network according to an embodiment of the present invention
  • FIG. 6 is a flowchart of switching a top S voice service from a SAE/LTE network to a 2G/3G network according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of switching an IMS voice service from an SAE/LTE network to a 2G/3G network according to an embodiment of the present invention
  • Schematic diagram of the subsequent process
  • FIG. 8 is a schematic diagram of a process of switching a B1S voice service from a 2G/3G network to an SAE/LTE network according to an embodiment of the present invention
  • FIG. 9 is a flowchart of subsequently switching a top S voice service from a 2G/3G network to an SAE/LTE network according to an embodiment of the present invention
  • FIG. 10 is a schematic diagram of a UE initiating a top S voice call on a SAE/HSPA network according to an embodiment of the present invention
  • FIG. 11 is a schematic diagram of switching from a SAE/HSPA network to a 2G/3G network according to an embodiment of the present invention
  • FIG. 12 is a flowchart (refer to SRV MGW) for switching an IMS voice service from a SAE/LTE network to a 2G/3G network according to an embodiment of the present invention
  • FIG. 13 is a flowchart of switching an IMS voice service from a SAE/LTE network to a 2G/3G network according to an embodiment of the present invention (introduced into SRV MGW and Xia);
  • FIG. 14 is a flowchart of a subsequent process of switching an MS voice service from a SAE/LTE network to a 2G/3G network according to an embodiment of the present invention (introducing SRV MGW and RUA).
  • the embodiment of the present invention is to maintain the network one (the network one can support VoIP voice services, such as LTE network or HSPA (High-Speed Packet Access) network) and network 2 (network 2 may not support VoIP voice services, for example A method of voice continuity between 2G/3G networks).
  • the network can serve as the source network, and the network 2 can serve as the target network.
  • the network 2 can serve as the source network, and the network 1 can serve as the source network.
  • Target network the network one can support VoIP voice services, such as LTE network or HSPA (High-Speed Packet Access) network
  • the network 2 can serve as the target network.
  • the network 2 can serve as the source network
  • the network 1 can serve as the source network.
  • Target network the network 1 can serve as the source network.
  • the core network determines, according to the SRV capability of the UE, that the session is an SRV session, and notifies the UE to perform corresponding measurement;
  • the measurement report if it is judged that the target network PS domain cannot carry the voice data, the signaling bearer is transferred to the PS domain of the target network, and the voice data signaling bearer is transferred to the target network CS domain, so that the SRV is implemented at the bearer level.
  • the handover process is performed, and the PCC architecture is used to process the subsequent signaling after the handover.
  • the signaling bearer is transferred to the PS domain of the target network through the PS handover, and the core network allocates a B1RN number (IP Multimedia Routing Number) and sends it to the UE together with the PS handover command.
  • the UE establishes a CS domain bearer of the target network from the UE to the core network according to the top RN number, and the core network associates the CS domain bearer with the corresponding PS domain bearer according to the top RN number.
  • the signaling bearer and voice bearer of the session are switched to the packet domain of the target network.
  • the target network does not support the packet domain
  • the signaling bearer of the session is switched to the RUA
  • the voice bearer of the session is switched to the circuit domain of the target network
  • the PCC architecture is used to process the subsequent letter from the source network to the target network circuit domain. Therefore, the entire process of voice continuity is transparent to the service network, and the continuity of the voice service of the session and the normal use of other services of the service network are ensured without upgrading and modifying the service network.
  • the PS to PS switch can be used to trigger the entire process of switching voice data and nis signaling back to the source network. At the same time, this process can also trigger the re-establishment process of other data services.
  • the embodiments of the present invention are applicable to handover between a SAE/LTE network and a 2G/3G network, and are also applicable to handover between a SAE/HSPA network and a 2G/3G network, and are also applicable to a network of an IP access network supporting VoIP. Switching between networks of IP access networks that do not support VoIP.
  • the bearer of the BIS signaling is switched to the packet domain of the target network, and the B1S voice bearer is switched to the circuit domain of the target network, and the PCC (Policy and Charging) is utilized.
  • Control, policy control and charging control) architecture to handle subsequent signaling from the source network to the target network circuit domain, so that the entire process of SRV handover is transparent to the B1S network, thereby simplifying the handover process without the need for the MS network. Based on the upgrade and transformation, the continuity of the user's MS network voice service and the MS are guaranteed.
  • the PS switch from the target network to the source network may be used to trigger subsequent voice data and nis signaling to switch back to the source network, and at the same time, the PS The handover process can also trigger the re-establishment of other data services, and there is no need to upgrade the target network.
  • the target network packet domain supports VoIP
  • the signaling bearer and voice bearer of the session are switched to the packet domain of the target network.
  • the signaling bearer of the session is switched to the RUA (Remote User Agent), and the voice bearer of the session is switched to the circuit domain of the target network, and the source is processed by the PCC architecture.
  • the network switches to the subsequent signaling of the target network circuit domain, so that the entire process of voice continuity is transparent to the service network, and the continuity of the voice service of the session and the service network are ensured without upgrading and modifying the service network.
  • the SRV handover between the network supporting the VoIP IP access network and the 2G/3G network is taken as an example.
  • the UE attaches or bears the establishment process the UE reports the SRV capability to the core network, or the SRV capability of the UE can be statically configured in the HSS.
  • the UE When both the UE and the network support the process of initiating bearer setup from the network side, the UE initiates a top S voice session in the network and triggers the establishment of a voice dedicated bearer.
  • the core network determines that the voice session is an SRV session according to the SRV capability of the UE.
  • the radio side may need to send a measurement control message to the UE, and the measurement control message may include: supporting a PS domain and a CS domain neighbor cell list, supporting only a PS domain neighbor cell list, and only supporting a CS domain neighbor cell list;
  • the measurement report is sent to the wireless side, and the top S signaling bearer and the top S voice bearer can be switched by the following three methods:
  • Method 1 Determine whether the target network can support VoIP voice services.
  • the target network can carry the VoIP voice service
  • the top S signaling bearer and the top S voice data bearer are all transferred to the target network PS domain
  • the top S signaling bearer is transferred to the target network PS domain, and the top S voice data bearer is transferred to the target network CS domain;
  • Method 2 Pre-configure the transfer mode of the nis signaling bearer and the nis voice data bearer in the source network.
  • the source network is statically configured to: Directly transferring the nis signaling bearer to the target network PS domain, and transferring the nis voice data bearer to the target network cs domain; or
  • the top S voice data bearer is directly transferred to the target network CS domain, and the top S signaling data bearer is transferred to the RUA.
  • Method 3 The source network preferentially uses the nis signaling bearer and the nis voice bearer to be transferred from the source network to the target network.
  • the PS domain determines whether the target network can support the VoIP voice service. If the feedback result is that the target network cannot bear the VoIP voice service, the nis signaling bearer is transferred to the target network PS domain, and the nis voice data bearer is transferred. Go to the target network cs domain.
  • the target network to source network PS handover may be used to trigger subsequent handover of the voice data and the nis signaling back to the source network, and the PS handover process may also trigger other data services. Re-established.
  • the technical solution of implementing the SRV on the bearer level may be adopted, that is, the bearer of the NIS signaling is switched to the PS domain of the target network.
  • nis voice data bearer to the target network cs domain, or switching both the nis signaling bearer and the nis voice data bearer to the target network PS domain, or only switching the nis voice data bearer to the target network cs domain
  • the data is transferred to the RUA, and the corresponding top S voice service PS domain bearer and the CS domain bearer are associated through the core network, and then the PCC architecture can be used to process the subsequent signaling of the source network to the target network, so that the entire SRV switchover is performed.
  • the process is transparent to the nis network, which simplifies the handover process.
  • the continuity of the user's top S network voice data and the normal use of other services of the top S network are ensured;
  • the PS switch from the target network to the source network can be used to trigger the subsequent voice data and the nis signaling to switch back to the source network. Meanwhile, the PS handover process can also trigger other data services. Re-established, and there is no need to upgrade the target network.
  • the SRV switching between the SAE/LTE network and the 2G/3G network is taken as an example.
  • the UE When the UE is attached to the SAE/LTE network, the UE reports the SRV capability to the EPC (Evolved Packet Core). At the same time, the 2G/3G neighbor cell PS/CS capability information and the VoIP voice service capability message are configured on the eNodeB;
  • EPC Evolved Packet Core
  • the EPC determines that the session is an SRV session according to the SRV capability of the UE, and notifies the eNodeB;
  • the eNodeB may need to send a corresponding measurement control message to the UE, and the measurement control message may include: supporting PS/CS 2G/3G neighbor cell list, only supports 2G/3G PS neighbor cell list and only supports 2G/3G CS neighbor cell list;
  • the UE performs measurements and sends a measurement report to the eNodeB.
  • both IMS signaling and VoIP voice services are carried in the SAE/LTE PS domain.
  • the eNodeB can make the following judgment according to the measurement report and the VoIP voice service capability of the target network: if the 2G/3G network can carry the VoIP voice service, transfer the bearer of the B1S voice data and the IMS signaling to the 2G/3G PS domain;
  • the top S signaling bearer is transferred to the 2G/3G PS domain, and the top S voice data bearer is transferred to the 2G/3G CS domain;
  • the top S voice data bearer is transferred to the 2G/3G CS domain, and the IMS signaling data bearer is transferred to the RUA.
  • the structure of switching from the SAE/LTE network to the 2G/3G network described in this embodiment is as shown in FIG. 5.
  • the eNodeB determines whether the 2G/3G PS domain cannot carry the voice data service according to the measurement report and whether the 2G/3G network has the capability of carrying the VoIP voice service, and the eNodeB notifies.
  • Core network The nis signaling bearer is transferred to the target network PS domain through PS handover, and the nis voice bearer is transferred to the target network CS domain through PS to cs handover.
  • the core network After receiving the handover notification, the core network simulates a DTM handover (Dual Transfer Mode Handover) process, and sends a corresponding handover request to the 2G/3G PS domain and the CS domain respectively, and switches the B1S voice data. To the 2G/3G CS domain, the top S signaling bearer is switched to the 2G/3G PS domain.
  • DTM handover Direct Transfer Mode Handover
  • the MME regards the Serving/PDN SAE Gateway as the MGW and establishes Serving/PDN with its organization.
  • the link between the SAE Gateway and the MSC-S/MGW From the perspective of the peer UE, the IP address and port of the top S user plane and the signaling control plane have not changed.
  • the flow chart of the process of switching the B1S voice service from the SAE/LTE network to the 2G/3G network in this embodiment is as follows:
  • the UE When the UE is attached to the SAE/LTE network, the UE reports the SRV capability to the EPC, or the SRV capability of the UE can be statically configured in the HSS.
  • the UE initiates a B1S session in the SAE/LTE network and triggers establishment of a dedicated bearer;
  • the 6-KEPC may determine that the session may need to be handed over from the SEA/LTE network to the 2G/3G domain, and the MME may notify the eNodeB that the session may require SRV handover; the eNodeB may need to send a corresponding measurement control message to the UE.
  • the measurement control message includes: supporting the PS/CS 2G/3G neighbor cell list, supporting only the 2G/3G PS neighbor cell list, and only supporting the 2G/3G CS neighbor cell list, and the UE performs measurement; 6-2.
  • the UE sends a measurement report to the eNodeB.
  • the eNodeB determines the switching mode of the MS voice data and the MS signaling bearer according to the measurement report of the UE and the VoIP voice service capability of the target network:
  • the eNodeB determines that the 2G/3G PS domain can carry the MS voice data, the eNodeB sends a PS domain to PS domain handover request to the EPC, and switches the MS voice data and the MS signaling bearer to the 2G/3G PS domain. If the eNodeB determines that the 2G/3G PS domain cannot bear the MS voice data, the eNodeB sends a PS domain to the CS domain handover request to the EPC, instructing the EPC to initiate a similar DTM handover procedure to switch the bearer of the MS signaling to the 2G/3G PS domain, and Switching the B1S voice data bearer to the 2G/3G CS domain; and retaining the context information of the associated dedicated bearer in the EPC;
  • the eNodeB determines that the target network does not support the PS, the eNodeB sends a PS domain to the CS domain handover request to the EPC, instructing the EPC to switch the B1S voice data bearer to the 2G/3G CS domain, and switch the B1S signaling data bearer to the RUA, and The context information of the associated dedicated bearer is retained in the EPC;
  • the eNodeB determines that the target network cannot bear the MS voice data, the eNodeB sends a PS to CS handover request to the EPC, instructing the EPC to initiate a DTM Handover process, and switching the bearer of the MS signaling to the 2G/3G PS domain. Switching the B1S voice data bearer to the 2G/3G CS domain; and, the context information of the associated dedicated bearer is retained in the EPC;
  • the MME After the MME receives the PS to CS handover message, the MME sends a preparation handover request message to the SGSN, and switches the IMS signaling bearer to the target network PS domain.
  • the MME After receiving the PS to CS handover message, the MME starts a basic inter-MSC handover procedure, and switches the B1S voice data to the 2G/3G CS domain. Since the MME is emulated as an anchor MSC, the MSC-S/MGW does not know that it is an inter-MSC handover initiated by E. When establishing an inter-office link, the Serving/PDN SAE Gateway is treated as an MGW accordingly;
  • IMSI International Mobile Subscriber Identifier (International Mobile Subscriber Identifier);
  • MSC-S/MGW returns an encryption key or an "unknown part" message to the MME;
  • the MME sends the message to the MSC-S in the preparation handover request message; 6-8, the SGSN returns a preparation handover request response message to the MME;
  • the MME regards the Serving/PDN SAE Gateway as an MGW, and establishes a link between the Serving/PDN SAE Gateway and the MSC-S/MGW;
  • the IP address and port of the MS user plane and the signaling control plane do not change.
  • the data is forwarded to the MSC-S/MGW.
  • the MSC-S /MGW forwards the data to the UE;
  • the data is forwarded to the Serving/PDN SAE Gateway, and then the Serving/PDN SAE Gateway forwards the data to the peer UE;
  • the MME sends a preparation user plane message to the Serving/PDN SAE Gateway.
  • the Serving/PDN SAE Gateway associates the corresponding top S voice data PS bearer with the CS bearer. After the processing is completed, the Serving/PDN SAE Gateway returns to the user.
  • the face preparation message is sent to the MME;
  • the top S voice data bearer has been switched to the 2G/3G CS domain through the PS to CS handover, but in order to ensure the normal use of the top S service, the top S signaling bearer should also be performed through the PS to PS handover. Switch to the GSM PS domain.
  • FIG. 7 is a schematic diagram of a subsequent process for switching a B1S voice service from a SAE/LTE network to a 2G/3G network according to the following steps:
  • UE accesses the target 2G/3G network, and the UE sends a CS handover complete message to the BSC/RNC (Base Station Controller/Radio Network, Base Station Controller/Radio Network Controller).
  • BSC/RNC Base Station Controller/Radio Network, Base Station Controller/Radio Network Controller
  • the UE stops the SAE/LTE network wireless signal and turns to the wireless signal of the target network;
  • BSC/RNC sends a handover complete message to MME through MSC-S
  • MME Notification Serving/PDN SAE Gateway activates the user plane, and Serving/PDN SAE Gateway returns ISUP Answer to hide;
  • ISUP ANSWER indicates that if the called MS (Mobile Subscriber, mobile subscriber) picks up the phone, the called party
  • the MSC sends an "ANSWER" message to the calling MSC, at which point the link between the calling party and the called party is connected;
  • the BSC/RNC sends a PS handover complete message to the MME through the SGSN, and the normal 2G/3G network to the SAE/LTE network PS handover process;
  • MME releases SAE/LTE network radio resources.
  • the UE switches from the SAE/LTE network to the 2G/3G network, the MS signaling is carried in the target network PS domain, and the top S signaling control channel is maintained, and the PCC architecture is used to process the subsequent signaling after the handover.
  • the B1S voice data is transmitted on the hybrid bearer, that is, the SAE/LTE PS domain bearer is from the Serving SAE Gateway to the PDN SAE Gateway, and the GSM CS domain bearer is carried between the Serving SAE Gateway and the UE.
  • the SAE/LTE PS domain bearer established according to the SAE/LTE network QoS (Quality of Service) parameter from the Serving SAE Gateway to the PDN SAE Gateway;
  • the EPC associates the PS domain bearer with the CS domain bearer.
  • the entire handover process is transparent to the BIS network, the peer UE, and the destination network. Therefore, the real-time voice service and the non-real-time service can operate normally.
  • the P-CSCF receives the BYE message, and the P-CSCF notifies the PCRF to release the bearer.
  • the PCRF notifies the SAE/LTE network to release the bearer, and the MME notifies the 2G/3G CS domain to release the corresponding CS bearer.
  • the entire handover process remains transparent to the B1S network, so the B1S network does not need to be upgraded and modified.
  • the PCC architecture is used to process the subsequent signaling from the SAE/LTE network to the 2G/3G network, simplifying the entire handover process and ensuring continuity of other services of the B1S network. Sex, and the top S network does not need to be modified and upgraded.
  • the 2G/3G network to the SAE/LTE PS handover process can be used to trigger the entire top S voice and signaling. Switch back to the SAE/LTE network process. At the same time, this process can also trigger the reactivation process of other data services on the SAE/LTE network.
  • the flow of the subsequent top S voice service from the 2G/3G network to the SAE/LTE network is shown in the following steps.
  • the specific steps are as follows:
  • BSC/RNC sends PS handover request message to SGSN;
  • the SGSN sends a preparation for a subsequent handover request message to the New MME.
  • the New MME sends a handover request message to the eNodeB, and the eNodeB sends a handover request response message to the New MME;
  • New MME informs Serving/PDN SAE Gateway to update the context. Notification message trigger
  • the Serving/PDN SAE Gateway establishes a radio side bearer for the top S voice service.
  • the notification message may also trigger a reactivation process of other data services of the SAE/LTE network;
  • the flow chart of the subsequent handover of the MS voice service from the 2G/3G network to the SAE/LTE network is as follows:
  • the UE stops the wireless signal of the destination network PS domain and the CS domain, starts to connect to the SAE/LTE network wireless signal, and the UE sends a handover complete message to the network, and connects the UE to the SAE/LTE network.
  • the UE may release CS resources at 8-16; 8-21 to 8-23, releasing the PS domain and the CS domain resource of the destination network, and notifying the PCRF RAT (Radio Access Technology) type change;
  • PCRF RAT Radio Access Technology
  • the 2G/3G network when it is required to switch from the 2G/3G network to the SAE/LTE network, the 2G/3G network can be used to switch to the SAE/LTE network PS, and the subsequent handover from the 2G/3G network to the SAE/LTE network can be triggered. It is not necessary to upgrade the GSM network, but to switch from the 2G/3G network back to the SAE/LTE network on the basis of ensuring the continuity of the voice service.
  • the technical solution of implementing the SRV on the bearer level may be adopted, that is, the bearer of the B1S signaling is switched to the target.
  • the nis voice data bearer is switched to the target network cs domain, or both the nis signaling bearer and the nis voice data bearer are switched to the target network PS domain, or only the nis voice data bearer is switched to the target network cs domain,
  • the nis signaling data is transferred to the RUA and the corresponding top S voice service PS domain bearer and the CS domain bearer are associated through the core network, and the subsequent PCC architecture can be used to process subsequent signaling from the SAE/LTE network to the 2G/3G network.
  • the entire process of SRV handover is transparent to the nis network, thereby simplifying the handover process, ensuring the continuity of the user's top S network voice service and other services of the top S network without upgrading and modifying the nis network. Normal use;
  • the SAE/LTE network PS handover triggers the entire process of switching the top S voice and signaling back to the SAE/LTE network, thereby eliminating the need to upgrade the 2G/3G network.
  • the SRV switching between the SAE/LTE network and the 2G/3G network is also taken as an example.
  • the eNodeB is directly configured to preferentially adopt the analog DTM handover procedure, and the top S signaling bearer is transferred to the 2G/3G PS domain through the PS handover, and the PS is transmitted through the PS.
  • the handover to CS transfers the top S voice bearer to the 2G/3G CS domain.
  • the UE may report the SRV capability to the core network or the SRV capability of the UE may be statically configured in the HSS; when the UE initiates a top S voice session in the network and triggers the establishment of the dedicated bearer, the core network according to the UE
  • the SRV capability determines that the session is an SRV session and sends a message to the eNodeB.
  • the eNodeB can be configured to preferentially use the analog DTM handover, transfer the top S signaling bearer to the 2G/3G PS domain through PS handover, and transfer the top S voice bearer to 2G through PS to CS handover.
  • the eNodeB may need to send a corresponding measurement control message to the UE.
  • the measurement control message includes: a list of neighboring cells supporting the PS/CS at the same time, and the UE sends a measurement report to the wireless side after performing corresponding measurement.
  • the eNodeB instructs the EPC to initiate the DTM Handover process, which switches the top S signaling bearer to the 2G/3G PS domain, and the top S
  • the voice data bearer is switched to the 2G/3G CS domain, and the context information of the associated dedicated bearer is retained in the core network.
  • the PCC architecture can be used to process the subsequent call. Signaling.
  • the PS switch from the 2G/3G network to the SAE/LTE network can be used to trigger the subsequent MS service to switch from the 2G/3G network back to SAE/LTE.
  • the technical solution provided by this embodiment can be used to implement the SRV technical solution at the bearer level when the switch between the network that establishes the IP access network and the 2G/3G network needs to be switched, that is, the pre-configuration by the eNodeB.
  • the NIS signaling bearer is directly switched to the target network PS domain, and the nis voice bearer is switched to the target network cs domain, and the PCC architecture can be used to process the subsequent signaling after the handover, so that the entire process of the SRV handover is maintained for the nis network. Transparent, which simplifies the switching process.
  • the continuity of the user's top S network voice data and the normal use of other services of the B1S network are guaranteed. Meanwhile, when the subsequent needs are from 2G/ When the 3G network switches to the SAE/LTE network, the 2G/3G to SAE/LTE PS handover can be used to trigger the entire process of switching the top S voice and signaling back to the SAE/LTE network, thereby eliminating the need to upgrade the 2G/3G network. .
  • the SRV switching between the SAE/LTE network and the 2G/3G network is taken as an example.
  • the top RN number allocated by the core network is used to establish a corresponding CS bearer.
  • the UE When the UE attaches to the SAE/LTE network, the UE reports the SRV capability, or the SRV capability of the UE can be statically configured in the HSS.
  • the EPC determines that the session is an SRV session according to the SRV capability of the UE.
  • the eNodeB can carry the VoIP voice service according to the measurement report and the 2G/3G network. If the 2G/3G PS domain that the judgment is determined cannot carry the voice data service, the ijeNodeB notifies.
  • Core network Transfer the B1S signaling bearer to the 2G/3G PS domain.
  • the core network transfers the MS signaling bearer to the 2G/3G PS domain through the handover of the SAE/LTE network to the 2G/3G PS domain, and the MME and the Serving/PDN SAE Gateway allocate a top RN and switch commands in the PS. Bring to the UE.
  • the UE performs normal PS handover according to the PS handover command, and switches the MS signaling data of the UE to the 2G/3G PS domain, and the UE establishes from the UE to the Serving/PDN SAE Gateway through the MME according to the top RN number.
  • the 2G/3G CS bearers, and the Serving/PDN SAE Gateway associates the corresponding CS domain bearers with the PS domain bearers.
  • the subsequent steps of switching from the 2G/3G network to the SAE/LTE network are the same as those in the first embodiment.
  • the technical solution of implementing the SRV at the bearer level may be adopted, that is, the B1S signaling is carried by the PS handover.
  • Transfer to the 2G/3G PS domain, and the core network allocates a top RN number, establishes a 2G/3G CS bearer according to the top RN number, and the core network associates the corresponding CS domain bearer with the PS domain bearer, so that the entire SRV switch
  • the process is transparent to the B1S network, which simplifies the handover process.
  • the continuity of the user's top S network voice service and the normal use of other services of the top S network are ensured.
  • the PS switch from the 2G/3G network to the SAE/LTE network can be used to trigger the entire process of switching the top S voice and signaling back to the SAE/LTE network. This eliminates the need to upgrade 2G/3G networks.
  • the SRV switching between the SAE/LTE network and the 2G/3G network is taken as an example.
  • the SAE/LTE network preferentially transfers both the BIS signaling bearer and the BIS voice data bearer to the 2G/3G PS domain, and judges 2G according to the feedback of the 2G/3G network. Whether the /3G network can support VoIP voice services;
  • the B1S signaling bearer is transferred to the 2G/3G.
  • the PS domain transfers the top S voice data bearer to the 2G/3G CS domain.
  • the UE When the UE attaches to the SAE/LTE network, the UE reports the SRV capability, or the SRV capability of the UE can be statically configured in the HSS.
  • the EPC determines that the session is an SRV session according to the SRV capability of the UE.
  • the network priority uses the top S signaling bearer and the top S voice bearer to be transferred to the 2G/3G PS domain, and the BPeNodeB initiates the slave
  • the SAE/LTE to 2G/3G PS handover transfers both the top S signaling bearer and the top S voice bearer to the 2G/3G PS domain.
  • the top S signaling bearer and the VoIP voice service bearer are both in the SAE/LTE PS domain.
  • the eNodeB initiates an analog DTM handover, and transfers the top S signaling bearer to the 2G/3G PS domain through PS handover, and transfers the top S voice bearer to the 2G/3G CS domain through PS to CS handover.
  • the eNodeB may need to send a corresponding measurement control message to the UE.
  • the measurement control message includes a list of neighboring cells supporting both the PS domain and the CS. After the UE performs corresponding measurement, the UE sends a measurement report to the wireless side.
  • the eNodeB instructs the EPC to initiate the DTM Handover process to switch the top S signaling bearer to the 2G/3G PS domain, switch the top S voice data bearer to the 2G/3G CS domain, and keep the context information of the associated dedicated bearer in the core network. in.
  • the PS handover triggers subsequent handover from the 2G/3G network back to the SAE/LTE network from the MS service.
  • the technical solution of implementing the SRV at the bearer level may be adopted, that is, the nis signaling bearer and the nis voice data are used.
  • the bearer is transferred to the 2G/3G PS domain. If the 2G/3G network response cannot carry the VoIP voice service, the top S signaling bearer is transferred to the 2G/3G PS domain, and the top S voice data bearer is transferred to the 2G/3G CS domain.
  • the entire process of SRV handover is transparent to the top S network, which simplifies the handover process. On the basis of the upgrade and modification of the top S network, the continuity of the B1S network voice service and other services of the top S network are ensured. Normal use;
  • the PS handover from the 2G/3G network to the SAE/LTE network can be utilized to trigger the entire process of switching BIS voice and signaling back to the SAE/LTE network, thereby eliminating the need for Upgrade the 2G/3G network.
  • the SRV switching between the SAE/HSPA network and the 2G/3G network is taken as an example.
  • LTE Long Term Evolution
  • SAE System Architecture Evolution
  • HSPA High Speed Packet Access
  • SAE core network gpSAE/HSPA
  • HSPA technology is a natural upgrade of WCDMA (Wideband Code Division Multiple Access). Its main advantage is that it can increase the uplink and downlink data transmission rate, which is beneficial for operators to carry out mobile broadband data services.
  • WCDMA Wideband Code Division Multiple Access
  • FIG. 10 is a schematic diagram of a UE initiating a call on a SAE/HSPA network according to the embodiment.
  • HSPA uses the SAE core network (gp SAE/HSPA)
  • the UE is attached to the SAE/HSPA network, and the UE reports the SRV and the _Init capability (Network initiation, network initiation bearer establishment capability) to the EPC.
  • gp SAE/HSPA SAE core network
  • SRV and the _Init capability Network initiation, network initiation bearer establishment capability
  • the EPC determines the session as the SRV session according to the SRV capability of the UE and the corresponding RAT type, and sends a message to notify Evolved HSPA Access o.
  • the Evolved HSPA Access may need to send a corresponding measurement control message to the UE. After the UE performs the corresponding measurement, it sends a measurement report to Evolved HSPA Access.
  • the 2G/3G neighbor cell PS domain and CS domain capability information and the VoIP voice service capability message can be configured on the Evolved HSPA Access.
  • Evolved HSPA Access makes the following judgments:
  • the bearer of the top S voice data and the top S signaling is transferred to the 2G/3G PS domain;
  • the top S signaling bearer is transferred to the 2G/3G PS domain, and the top S voice data bearer is transferred to the 2G/3G CS domain;
  • the top S voice data bearer is transferred to the 2G/3G CS domain, and the IMS signaling data bearer is transferred to the RUA.
  • the eNodeB When the UE switches from the SAE/HSPA network to the 2G/3G network, according to the measurement report and the ability of the 2G/3G network to support the VoIP voice service, if it is determined that the 2G/3G PS domain cannot carry the voice data service, the eNodeB notifies the core network: The top S signaling bearer is transferred to the target network PS domain, and the B1S voice bearer is transferred to the target network CS domain.
  • the core network After receiving the notification, the core network simulates a DTM handover process, and sends corresponding handover requests to the 2G/3G PS domain and the CS domain respectively, and switches the top S voice data to the 2G/3G CS domain, and the top S signaling.
  • the bearer is switched to the 2G/3G PS domain.
  • both the IMS signaling bearer and the VoIP voice bearer are in the SAE/HSPA network, and the corresponding PS bearers are respectively used.
  • FIG. 11 it is a schematic diagram of switching from SAE/HSPA to 2G/3G network in this embodiment.
  • the 2G/3G PS domain can be switched to the SAE/HSPA network to trigger subsequent handover from the 2G/3G network to the SAE/HSPA network.
  • the technical solution of implementing the SRV on the bearer level may be adopted, that is, the wireless side according to the measurement report and 2G/ The ability of the 3G network to support the VoIP voice service. If it is determined that the 2G/3G PS domain cannot carry the voice data service, the top S signaling bearer is transferred to the PS domain of the target network, and the B1S voice bearer is transferred to the target network CS domain.
  • the entire process of SRV switching is transparent to the nis network, which simplifies the handover process. On the basis of no need to upgrade and modify the nis network, the continuity of the user's top S network voice service and the normal use of other services of the top S network are guaranteed. ;
  • the PS switch from the 2G/3G network to the SAE/HSPA network can be used to trigger the entire process of switching the top S voice and signaling back to the SAE/HSPA network. This eliminates the need to upgrade 2G/3G networks.
  • Example 7 In the present embodiment, as in the sixth embodiment, the SRV switching between the SAE/HSPA network and the 2G/3G network is taken as an example.
  • the Evolved HSPA Access determines how to switch according to the measurement report of the UE and whether the target network supports the VoIP capability.
  • the SAE/HSPA network preferentially uses the B1S signaling bearer and the IMS voice bearer. All of them are transferred to the 2G/3G PS domain.
  • the B1S signaling is performed.
  • the bearer is transferred to the 2G/3G PS domain, and the top S voice data bearer is transferred to the 2G/3G CS domain.
  • the UE When the UE attaches or bears the HSPA network, the UE reports the SRV and _Init capabilities.
  • the core network determines that the session is an SRV session according to the SRV capability of the UE.
  • the SAE/HSPA network preferentially transfers both the B1S signaling bearer and the B1S voice bearer to the 2G/3G PS domain, that is, the eNodeB initiates the handover from the SAE/HSPA network to the 2G/3G PS, and transfers both the B1S signaling bearer and the B1S voice bearer. Go to the 2G/3G PS domain. At this time, the top S signaling bearer and the VoIP voice service bearer are both in the SAE/HSPA PS domain.
  • the Evolved HSPA Access initiates the analog DTM handover, and the top S signaling bearer is transferred to the 2G/3G PS domain through the PS handover, and the PS to CS handover is performed. Transfer the B1S voice bearer to the 2G/3G CS domain.
  • the eNodeB may need to send a corresponding measurement control message to the UE.
  • the measurement control message includes: a list of neighboring cells supporting the PS/CS at the same time, and the UE performs corresponding measurement and sends a measurement report to the wireless side.
  • Evolved HSPA Access instructs the EPC to initiate the DTM Handover procedure, switching the top S signaling bearer to the 2G/3G PS domain, switching the top S voice data bearer to the 2G/3G CS domain, and the context information of the associated dedicated bearer remains in the core.
  • the net In the net;
  • the PS switch from the 2G/3G network to the SAE/HSPA network can be used to trigger the subsequent B1S service to switch from the 2G/3G network back to the SAE/HSPA network.
  • the technical solution of the present embodiment provides that when a handover between the SAE/HSPA network and the 2G/3G network is required, the technical solution of implementing the SRV at the bearer level may be adopted, so that the entire process of the SRV handover is performed on the B1S network.
  • the SRV switching between the SAE/HSPA network and the 2G/3G network is taken as an example.
  • HSPA uses SAE as the core network, and in this embodiment, HSPA uses SGSN and Serving/PDN.
  • the SAE Gateway core network either uses the SGSN and GGSN core networks.
  • the SGSN acts as the MME and the Serving/PDN SAE Gateway in the second embodiment.
  • the UE When the UE attaches to the SAE/HSPA network, the UE reports the SRV and NW_Init capabilities to the core network.
  • the core network determines that the voice session is an SRV session according to the SRV capability of the UE and the corresponding RAT type. And sending a message to notify Evolved HSPA Access, the Evolved HSPA Access may send a corresponding measurement control message to the UE, the UE performs corresponding measurement and sends a measurement report to the Evolved HSPA Access; configured on the Evolved HSPA Access 2G/3G neighbor cell PS/CS capability information and VoIP capability message.
  • the Evolved HSPA Access makes the following judgments based on the measurement report and the target network supporting VoIP voice service capabilities:
  • the bearer of the B1S voice data and the IMS signaling is transferred to the 2G/3G PS domain;
  • the B1S signaling bearer is transferred to the 2G/3G PS domain, and the top S voice data bearer is transferred to the 2G/3G CS domain;
  • the top S voice data bearer is transferred to the 2G/3G CS domain.
  • the ijeNodeB notifies the core network: The B1S signaling bearer is transferred to the 2G/3G PS domain, and the B1S voice bearer is transferred to the 2G/3G CS domain.
  • the core network After receiving the notification, the core network simulates a DTM handover process, and sends a corresponding handover request to the 2G/3G PS domain and the CS domain respectively, and switches the B1S voice data to the 2G/3G CS domain, and the The B1S signaling bearer is switched to the 2G/3G PS domain.
  • the SGSN is treated as an MSC-S/MGW, and the organization establishes a link between the SGSN and the MSC-S/MGW.
  • the peer UE and the top S network are transparent to the entire handover process. That is, from the perspective of the peer UE, the IP address and port of the top S user plane and the signaling control plane do not change, and the PCC architecture can be used to process the subsequent handover. Signaling.
  • the switch from the 2G/3G PS domain to the SAE/HSPA network is used to trigger subsequent handover from the 2G/3G CS domain back to the SAE/HSPA network.
  • the BSC/RNC sends a PS handover request message to the SGSN, where the request message includes a context of a primary PDP (Packet Data Protocol) carrying the MS signaling and a context of a secondary PDP carrying the voice, and the SGSN sends a corresponding handover request message.
  • Request a switch to Evolved HSPA Access, and Evolved HSPA Access establishes the corresponding radio resource.
  • the technical solution of implementing the SRV at the bearer level may be adopted, that is, the bearer of the B1S signaling is switched to the target.
  • the packet domain of the network, and the IMS voice bearer is switched to the circuit domain of the target network, and the PCC architecture is used to process the subsequent signaling from the SAE/HSPA network to the 2G/3G CS domain, so that the entire process of SRV handover to the B1S network Keeping transparent, which simplifies the switching process.
  • the continuity of the user's top S network voice service and the normal use of other services of the B1S network are guaranteed. Meanwhile, when the subsequent needs are from 2G
  • the switch from the 2G/3G PS domain to the SAE/HSPA network can be used to trigger the subsequent handover from the 2G/3G CS domain to the SAE/HSPA network, thereby eliminating the need for the 2G/3G network. upgrade.
  • the SRV switching between the SAE/LTE network and the 2G/3G network is also taken as an example.
  • the nis voice bearer is transferred to the switch by PS to cs to
  • SRV MGW Single Radio VCC MGW, voice continuity media gateway between single receiver top S and CS
  • the Gateway transfers the BIS voice data to the SRV MGW, and the SRV MGW is responsible for converting the voice codec of the BIS voice data, and associating the PS bearer of the SAE/LTE with the CS bearer.
  • the interface between the SRV MGW and the MME is the Mc interface and the S1-MME, and the interface between the SRV MGW and the Serving SAE Gateway is the S1-U interface.
  • the UE When the UE is attached to the SAE/LTE network, the UE reports the SRV capability to the EPC. At the same time, the 2G/3G neighbor cell PS/CS capability information and the VoIP voice service capability message are configured on the eNodeB;
  • the EPC determines that the session is an SRV session according to the SRV capability of the UE, and notifies the eNodeB;
  • the eNodeB may need to send a corresponding measurement control message to the UE.
  • the measurement control message may include: supporting a PS/CS 2G/3G neighbor cell list, supporting only a 2G/3G PS neighbor cell list, and supporting only a 2G/3G CS neighbor cell list;
  • the UE performs measurements and sends a measurement report to the eNodeB.
  • the top S signaling and the VoIP voice service are both carried in the SAE/LTE PS domain.
  • the eNodeB can make the following judgments based on the measurement report and the VoIP voice service capability of the target network: If the 2G/3G network can carry the VoIP voice service, transfer the bearer of the B1S voice data and the IMS signaling to the 2G/3G PS domain;
  • the top S signaling bearer is transferred to the 2G/3G PS domain, and the top S voice data bearer is transferred to the 2G/3G CS domain;
  • the top S voice data bearer is transferred to the 2G/3G CS domain, and the IMS signaling data bearer is transferred to the RUA.
  • the technical solution provided by this embodiment can be used to implement the SRV technical solution at the bearer level when the switch between the network that establishes the IP access network and the 2G/3G network needs to be switched, that is, the pre-configuration by the eNodeB.
  • the NIS signaling bearer is directly switched to the target network PS domain, and the nis voice bearer is switched to the target network cs domain, and the PCC architecture can be used to process the subsequent signaling after the handover, so that the entire process of the SRV handover is maintained for the nis network. Transparent, which simplifies the switching process.
  • the continuity of the user's top S network voice data and the normal use of other services of the B1S network are guaranteed. Meanwhile, when the subsequent needs are from 2G/ 3G network switches to
  • the switch from 2G/3G to SAE/LTE PS can be used to trigger the switching of the entire top S voice and signaling back.
  • the SAE/LTE network process eliminates the need to upgrade 2G/3G networks.
  • step 12-11 the MME notifies the SRV MGW to prepare the corresponding CS resource, and establishes an inter-office bearer.
  • the MME notifies the Serving/PDN SAE Gateway to transfer the top S voice data to the SRV MGW.
  • the SRV MGW is responsible for processing the top S voice bearer, and associates the PS bearer of the SAE/LTE with the CS bearer, and the SRV MGW is responsible for the conversion of the voice codec of the top S voice data.
  • the technical solution of implementing the SRV on the bearer level may be adopted, that is, the bearer of the B1S signaling is switched to the target.
  • the nis voice data bearer is switched to the target network cs domain, or both the nis signaling bearer and the nis voice data bearer are switched to the target network PS domain, or only the nis voice data bearer is switched to the target network cs domain,
  • the nis signaling data is transferred to the RUA, and the corresponding top S voice service PS domain bearer and the CS domain bearer are associated through the core network, and the subsequent PCC architecture can be used to process the follow-up letter from the SAE/LTE network to the 2G/3G network.
  • the entire process of SRV handover is transparent to the nis network, thereby simplifying the handover process, and ensuring the continuity of the user's top s network voice service and other services of the top s network without upgrading and modifying the nis network.
  • Normal use when switching from the 2G/3G network back to the SAE/LTE network, the PS switch from the 2G/3G network to the SAE/LTE network can be used to trigger the entire top S voice and signaling switch back to SAE/ LTE network process, thus eliminating the need Upgrade the 2G/3G network.
  • the SRV switching between the SAE/HSPA network and the 2G/3G network is taken as an example.
  • the Evolved HSPA Access determines how to switch according to the measurement report of the UE and whether the target network supports the VoIP voice service capability.
  • the SAE/HSPA network preferentially uses the B1S signaling bearer and the B1S voice.
  • the bearer is transferred to the 2G/3G PS domain, and according to the feedback of the 2G/3G network, it is judged whether the 2G/3G network can support the VoIP voice service. If the feedback result is that the 2G/3G network cannot carry the VoIP voice service, the top S is The signaling bearer is transferred to the 2G/3G PS domain, and the top S voice data bearer is transferred to the 2G/3G CS domain.
  • the UE When the UE attaches or bears the SAE/HSPA network, the UE reports the SRV and the _Init capability.
  • the core network determines that the session is an SRV session according to the SRV capability of the UE.
  • the SAE/HSPA network preferentially transfers both the top S signaling bearer and the top S voice bearer to the 2G/3G PS domain, that is, the eNodeB initiates a handover from SAE/HSPA to 2G/3G PS, and the IMS signaling bearer
  • the top S voice bearers are all transferred to the 2G/3G PS domain.
  • the top S signaling bearer and the VoIP voice bearer are both in the SAE/HSPA PS domain.
  • Access initiates an analog DTM handover, and transfers the top S signaling bearer to the 2G/3G PS domain through PS handover, and transfers the top S voice bearer to the 2G/3G CS domain through PS to CS handover.
  • the eNodeB may need to send a corresponding measurement control message to the UE.
  • the measurement control message includes: a list of neighboring cells supporting PS/CS at the same time, and the UE performs corresponding measurement and sends a measurement report to the wireless side.
  • the Evolved HSPA Access instructs the EPC to initiate a DTM Handover procedure, switching the top S signaling bearer to a 2G/3G PS domain, switching the IMS voice data bearer to a 2G/3G CS domain, and, related dedicated bearer Context information is kept in the core network;
  • the PCC architecture is used to process the subsequent signaling after the handover.
  • the PS switch from 2G/3G to SAE/HSPA can be used to trigger subsequent switching from the MS service to the SAE/HSPA from the 2G/3G network.
  • the technical solution of implementing the SRV at the bearer level may be adopted, that is, the bearer of the B1S signaling is switched to the target.
  • the packet domain of the network, and the IMS voice bearer is switched to the circuit domain of the target network, and the PCC architecture is used to process the
  • the SAE/HSPA network switches to the subsequent signaling of the 2G/3G CS domain, so that the entire process of SRV handover is transparent to the BIS network, which simplifies the handover process and ensures users without upgrading and modifying the top S network.
  • the SRV switching between the SAE/LTE network and the 2G/3G network is taken as an example.
  • a new network element SRV MGW is added to process the top S voice bearer, that is, the Serving/PDN SAE Gateway will be the top S.
  • the voice data is transferred to the SRV MGW, and the SRV MGW is responsible for converting the voice codec of the B1S voice data, and associating the PS bearer of the SAE/LTE with the CS bearer. Transfer IMS signaling to the RUA.
  • the interface between the SRV MGW and the MME is the Mc interface and the S1-MME, and the interface between the SRV MGW and the Serving SAE Gateway is the Sl-U interface.
  • the UE When the UE is attached to the SAE/LTE network, the UE reports the SRV capability to the EPC. At the same time, the 2G/3G neighbor cell PS/CS capability information and the VoIP voice service capability message are configured on the eNodeB;
  • the EPC determines that the session is an SRV session according to the SRV capability of the UE, and notifies the eNodeB;
  • the eNodeB may need to send a corresponding measurement control message to the UE.
  • the measurement control message may include: supporting a PS/CS 2G/3G neighbor cell list, supporting only a 2G/3G PS neighbor cell list, and supporting only a 2G/3G CS neighbor cell list;
  • the UE performs measurements and sends a measurement report to the eNodeB.
  • the top S signaling and the VoIP voice service are carried in
  • the eNodeB can make the following judgment according to the measurement report and the VoIP voice service capability of the target network: if the 2G/3G network can carry the VoIP voice service, transfer the bearer of the B1S voice data and the IMS signaling to the 2G/3G PS domain;
  • the top S signaling bearer is transferred to the 2G/3G PS domain, and the top S voice data bearer is transferred to the 2G/3G CS domain;
  • the top S voice data bearer is transferred to the 2G/3G CS domain, and the IMS signaling data bearer is transferred to the RUA.
  • a flow chart of switching an IMS voice service from an SAE/LTE network to a 2G/3G network is as follows:
  • the eNodeB can determine that the target 2G/3G PS domain cannot support the packet domain service according to the measurement report and whether the 2G/3G network has the capability of carrying the VoIP voice service.
  • the core network is notified:
  • the signaling bearer of the nis session is transferred to the RUA, and the nis voice bearer is transferred to the target network CS domain by the handover of ps to cs.
  • the core network After receiving the handover notification, the core network sends a corresponding handover request to the cs domain, and switches the nis voice data to
  • the 2G/3G CS domain transfers the signaling bearer of the IMS session to the RUA.
  • the signaling data of the top S session is transferred to the RUA, and the RUA proxy functions of the UE in the top S domain to keep the UE in the top S network registration and session state; Serving/PDN SAE Gateway will top S
  • the voice data is forwarded to the SRV MGW, and the top S signaling data is forwarded to the RAU.
  • the SRV MGW organization establishes a link between the SRV MGW and the MSC-S/MGW. From the perspective of the peer UE, the IP address and port of the top S user plane and the signaling control plane have not changed.
  • the technical solution of implementing the SRV on the bearer level may be adopted, that is, the bearer of the B1S signaling is switched to the target.
  • the nis voice data bearer is switched to the target network cs domain, or both the nis signaling bearer and the nis voice data bearer are switched to the target network PS domain, or only the nis voice data bearer is switched to the target network cs domain,
  • the nis signaling data is transferred to the RUA, and the corresponding top S voice service PS domain bearer and the CS domain bearer are associated through the core network, and the subsequent PCC architecture can be used to process the follow-up letter from the SAE/LTE network to the 2G/3G network.
  • the entire process of SRV handover is transparent to the nis network, thereby simplifying the handover process, and ensuring the continuity of the user's top S network voice service and other services of the top S network without upgrading and modifying the nis network. Normal use.
  • a base station may be used in the embodiment of the present invention, including:
  • the determining module 1 is configured to determine whether the session needs to be switched. Specifically, the determining may be performed according to the measurement report sent by the received terminal.
  • the processing module 1 is configured to transfer the signaling bearer of the session to the target network PS domain when the session needs to be switched from the source network to the target network; and transfer the voice data bearer of the session to the target network CS domain.
  • the PS domain to PS domain handover may be used to transfer the signaling bearer of the session to the target network PS domain.
  • the PS domain to CS domain handover may be used to transfer the voice data bearer of the session to the CS domain of the target network; or, in the process of transferring the signaling bearer of the session to the target network PS domain, the source network Assigning a routing number; establishing a CS domain bearer to the target network according to the routing number; and associating the PS domain bearer with the CS domain bearer according to the routing number.
  • the processing module 1 in the embodiment of the present invention may further switch the signaling bearer of the session from the target network to the source network by using PS domain to PS domain handover; establish a voice data bearer of the session in the source network; or In from In the case that the target network is switched back to the source network, the voice data bearer and the signaling bearer of the session are switched back to the source network by using PS domain to PS domain handover.
  • the base station may further include:
  • the receiving module 1 is configured to receive a measurement report sent by the terminal. In this way, the determining module 1 is configured to determine, according to the measurement report received by the receiving module, whether the session needs to be switched.
  • the terminal when the network is attached or the bearer is established, the terminal may report the capability of maintaining the continuity of the voice, or pre-statically configuring the terminal to maintain the continuity of the voice in the network; The ability to maintain voice continuity, the network side determines that the session initiated by the terminal is a session that needs to maintain the continuity of the voice.
  • the apparatus for implementing the voice continuity of the session is further provided in the embodiment of the present invention, including:
  • the determining module 2 is configured to determine whether the session needs to be switched
  • the processing module 2 is configured to: when the session needs to be switched from the source network to the target network, to switch the session from the source network to the target network, where the method includes: when the determining module 2 determines that the session needs to be switched from the source network to the target network, And transferring the voice data bearer of the session to a PS domain of the target network or a CS domain of the target network, and transferring the signaling bearer of the session to a PS domain or a remote user agent of the target network.
  • the receiving module 2 is configured to receive a measurement report sent by the terminal. In this way, the determining module 2 is configured to determine, according to the measurement report received by the receiving module 2, whether the session needs to be switched.
  • the determining module 3 is further configured to determine whether the target network can carry the VoIP voice service. If it is determined that the target network can carry VoIP voice services,
  • the processing module 2 transfers the signaling bearer of the session and the voice data bearer of the session to the target network PS domain; if it is determined that the target network cannot carry the VoIP voice service,
  • Processing module 2 transferring the voice data bearer of the session to the target network CS domain;
  • the processing module 2 transfers the voice data bearer of the session to the target network CS domain, and transfers the signaling bearer of the session to the remote user agent.
  • the processing module 2 in the embodiment of the present invention may also be processed according to the configuration in the network side, for example: may be configured on the network side: transfer the signaling bearer of the session to the target network PS domain, and the session Transmitting the voice data bearer to the target network CS domain; or transferring the signaling bearer of the session and the voice data bearer of the session to the target network PS domain; or transferring the voice data bearer of the session to the The target network CS domain, Transfer the signaling bearer of the session to a remote user agent.
  • the session in the embodiment of the present invention may be a nis session, such that the processing module 2 may transfer the signaling data of the nis session to a remote user agent; and transfer the voice data bearer of the nis session to the target network cs area.
  • the wireless side makes session signaling and session voice data according to the measurement report of the UE and the capability of the VoIP voice service of the target network.
  • the switching mode ensures that the entire switching process is transparent to the network on the basis of ensuring the continuity of the voice service of the user, thereby eliminating the need to upgrade the network.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif qui permettent d'assurer la continuité de données vocales au cours d'une session. Le procédé est mis en œuvre comme suit: lorsqu'un transfert est nécessaire entre un réseau de départ et un réseau de destination, le programme technologique assurant la continuité des données vocales au niveau de la voie porteuse est adopté; si le domaine de transmission des paquets du réseau de destination ne prend pas en charge le VoIP, la voie porteuse de signalisation de la session est commutée vers le domaine de transmission des paquets du réseau de destination, la voie porteuse de données vocales de la session est commutée vers le domaine de circuit du réseau de destination, et la signalisation consécutive, qui est transférée du réseau de départ au domaine de circuit du réseau de destination, est traitée au moyen d'une architecture PCC; la continuité des données vocales est transparente pour le réseau de desserte pendant toute la durée de la procédure. Le procédé de l'invention garantit à la fois la continuité du service vocal de la session et l'utilisation normale des autres services dans le réseau de desserte, sans nécessité de faire évoluer le réseau de desserte ou de le reconstruire. Lorsqu'il est nécessaire d'effectuer le transfert du réseau de destination au réseau de départ, par l'utilisation d'un transfert PS, le procédé de l'invention permet de déclencher le transfert par commutation des données vocales et signalisation de la session suivante au réseau de départ.
PCT/CN2008/070746 2007-04-17 2008-04-17 Procédé et dispositif permettant d'assurer la continuité de données vocales au cours d'une session Ceased WO2008125067A1 (fr)

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CN2007101027622A CN101291453B (zh) 2007-04-17 2007-04-24 一种实现会话的语音连续性的方法及装置
CN200710102762.2 2007-04-24

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