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WO2011023091A1 - 一种网络管理电路交换语音回落的方法和系统 - Google Patents

一种网络管理电路交换语音回落的方法和系统 Download PDF

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Publication number
WO2011023091A1
WO2011023091A1 PCT/CN2010/076259 CN2010076259W WO2011023091A1 WO 2011023091 A1 WO2011023091 A1 WO 2011023091A1 CN 2010076259 W CN2010076259 W CN 2010076259W WO 2011023091 A1 WO2011023091 A1 WO 2011023091A1
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WIPO (PCT)
Prior art keywords
network
eps
location update
voice
request
Prior art date
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PCT/CN2010/076259
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English (en)
French (fr)
Inventor
谢宝国
李志军
Original Assignee
中兴通讯股份有限公司
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Publication of WO2011023091A1 publication Critical patent/WO2011023091A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and system for network management circuit switching (CS) voice fallback.
  • CS network management circuit switching
  • the 3GPP (3rd Generation Partnership Project) standardization working group is currently working on PS Core (Packet Switched Core) and UTRAN (Universal Mobile Telecommunication System Radio Access Network).
  • PS Core Packet Switched Core
  • UTRAN Universal Mobile Telecommunication System Radio Access Network
  • the evolution of the communication system radio access network aims to enable the evolved PS Core (referred to as EPC) to provide higher transmission rates, shorter transmission delays, and support E-UTRAN (Evolved UTRAN).
  • GSM EDGE radio access network GSM EDGE radio access network
  • GSM EDGE radio access network GSM EDGE radio access network
  • EDGE is the abbreviation of Enhanced Data Rate for GSM Evolution, ie enhanced data rate GSM Mobility management between LTE, UTRAN, WLAN (Wireless Local Area Network) and other non-3GPP access networks.
  • EPS Evolved Packet System
  • Packet domain system Packet domain system
  • UE User Equipment, User Equipment, or Terminal 101
  • a terminal with the ability to access two types of wireless networks is called a dual mode terminal.
  • the dual mode terminal can be divided into a single wireless channel access and a dual wireless channel access terminal. The former can only access one wireless network at the same time; the latter can access two wireless access networks at the same time.
  • E-UTRAN 102 An evolved radio access network that provides higher uplink and downlink rates, lower transmission delays, and more reliable wireless transmission.
  • S-GW Serving Gateway
  • S-GW Serving Gateway
  • the P-GW (Packet Data Network Gateway, PDN GW or P-GW for short) 104 is responsible for the gateway function of the UE to access the PDN (Packet Data Network).
  • the P-GW and the S-GW may be combined in one physical entity.
  • the MME (Mobility Management Entity) 105 is a control plane entity that temporarily stores user data, and is responsible for managing and storing UE contexts (such as UE/user identity, mobility management state, user security parameters, etc.).
  • UE contexts such as UE/user identity, mobility management state, user security parameters, etc.
  • a temporary identifier is assigned to the user, and the UE is responsible for authenticating the UE when it is camped on the tracking area or the network.
  • the HSS (Home Subscriber Server) 106 which includes an HLR (Home Location Register) function, stores basic data and service data of the user.
  • HLR Home Location Register
  • IMS IP Multimedia Core Network Subsystem
  • EPS Packet Endpoint
  • GPRS General Packet Radio Service
  • WLAN Wireless Local Area Network
  • GERAN/UTRAN 107 Radio access network for traditional GSM/UMTS networks.
  • MSC Mobile Switching Center
  • VLR Visitor Location Register
  • GMSC Global Mobile Switching Center
  • the SGSN (Serving GPRS Support Node) 110 is a control network element of the GPRS network, and is mainly used to record the location information of the UE, and is completed between the UE and the GGSN (Gateway GPRS Supporting Node). Transmission and reception of mobile packet data.
  • the UE When the UE accesses the GSM or UMTS network, the user's basic voice service and the language based The supplementary service of the audio service is provided by the ⁇ 8 domain (or the CS network).
  • the MSC/VLR and the GMSC in FIG. 1 belong to the CS domain network element, and the user can communicate with the local network or other network through the CS domain (such as fixed Users of the telephone network and other mobile networks perform voice call services.
  • the user's IP service is provided through the PS (Packet Switched) domain.
  • the SGSN belongs to the PS domain network element.
  • the user accesses the packet data network through the PS domain.
  • the IP network provided by the operator in FIG. 1 is a packet data network.
  • the interface between the MSC/VLR and the SGSN is called a Gs interface.
  • the Gs interface completes the establishment of a Gs association relationship between the MSC/VLR and the SGSN (the VLR number is saved in the SGSN, and the SGSN number is saved in the VLR), and the MSC/VLR pages the UE of the called user through the PS domain after establishing the Gs association relationship. .
  • the interface between the MSC/VLR and the MME is called an SGs interface.
  • the SGs interface completes the establishment of an SGs association relationship between the MSC/VLR and the MME (the VLR number is stored in the MME and the MME address is stored in the VLR).
  • the basic voice service of the user and the supplementary service based on the voice service are controlled by the IMS.
  • the EPS itself cannot provide and control the voice call service, and can only provide the bearer of the IP data.
  • some operators only deploy EPS networks in key areas covered by UMTS/GSM networks to provide users with high-speed IP data services. There is no (or do not want to) deploy IMS. In this scenario, operations The company hopes to provide CS network services such as voice call service, short message service, location service, and unstructured supplementary service through the UMTS/GSM CS network that has been fully covered.
  • UMTS/GSM CS domain network to implement voice services.
  • the EPS network is first notified, and the EPS network switches the UE to the GSM/UMTS network, so that the UE can perform voice service on the CS network.
  • the IP service currently being carried out by the user on the EPS network is switched to the UMTS/GSM PS domain network. If the ongoing IP service cannot be switched to the UMTS/GSM PS domain, it is suspended or released in the EPS network. This is what is commonly referred to as CS fallback (or CS fallback).
  • the existing circuit domain fallback implementation method is roughly as follows: Introduced between the MME and the MSC/VLR A Gs-like interface, called SGs (as shown in Figure 1). When the UE is powered on to access the EPS network, the MME and the MSC/VLR establish an SGs association relationship through the SGs interface (the VLR number is saved in the MME, and the MME address is saved in the VLR). When the user moves in the network, the latest location information of the user is updated to the MME. If the MME changes, the MME information stored in the VLR is also updated, ensuring that the MME information stored in the VLR is always accurate.
  • the UE accessing the EPS network initiates a service such as a voice call
  • the UE sends a specific message to the E-UTRAN.
  • the E-UTRAN After receiving the message, the E-UTRAN initiates a handover procedure to switch the IP service currently being performed by the user to the UMTS/GSM.
  • the PS network or the EPS network hangs, etc., and then the UE accesses the UMTS/GSM network and initiates a voice call and other services on the CS network.
  • the UE accessing the EPS network is used as the called party of the CS service (receiving services such as voice calls),
  • the MSC/VLR sends a CS paging message to the EPS network through the SGs interface, and the EPS network receives the CS paging request message to perform circuit domain fallback.
  • the UE can only use the CS network to implement the voice service through the CS fallback technology.
  • the prior art in which the UE having CS fallback capability attaches to the EPS network and registers with the CS network is as follows, as shown in FIG.
  • the UE initiated EPS and CS attach process includes the following steps:
  • Step 201 The UE initiates an attach request to the MME by using the E-UTRAN, and carries an "attach type" parameter in the request message.
  • the attach type identifies that the UE requests the joint registration of the EPS and the IMSI (International Mobile Subscriber Identity). And inform the network that the UE can use the CS network.
  • IMSI International Mobile Subscriber Identity
  • Step 202 The MME authenticates the UE, downloads the subscription data of the UE from the HSS, and applies to the S-GW and the P-GW to establish a default bearer.
  • Step 203 The MME allocates a locally configured default LAI (Location Area Identifier), and finds the VLR number according to the allocated LAI, and then initiates a location update request to the MSC/VLR.
  • LAI Location Area Identifier
  • Step 204 The MME sends a location update request to the VLR, where the message includes a new LAI, an IMSI, an IP address of the MME, and a location update type.
  • Step 205 Establish a security association above the SGs port between the VLR and the MME.
  • Step 206 The VLR performs a location update process in the CS domain.
  • Step 207 After the location update of the CS domain is successful, the VLR returns a location update success message to the MME, where the message carries a VLR TMSI (Temporary Mobile Subscriber Identity).
  • VLR TMSI Temporal Mobile Subscriber Identity
  • Step 208 The MME sends an attach success message to the UE.
  • the message carries the relevant parameters of the EPS, and carries the relevant parameters of the CS location update, such as LAI, VLR TMSI, etc., and the UE determines that the joint registration is successful, and the UE can use the CS to fall back. The way to achieve voice services.
  • the TA/LA (Tracking Area and Location Area) update process initiated by the UE includes the following steps:
  • Step 301 The UE finds that the new TA does not belong to the TA list of the original MME, and the UE needs to perform the TA/LA update process and re-establish the SGs security association.
  • Step 302 The UE initiates a TAU request to the target MME, where the request message carries an update type parameter, indicating that this is a TA/LA joint update request.
  • Step 303 The EPS network performs a TAU process, and the target MME downloads the user subscription data of the UE from the HSS, and applies to the S-GW and the P-GW to establish a default bearer, and performs a process of the UE switching from the original MME to the target MME.
  • Step 304 For the MM (Mobility Management) context, there is VLR alliance information, and the VLR alliance information needs to be updated according to the new LA information.
  • the target MME sends a location update request to the VLR, carrying the new LAI, IMSI, MME IP address, and location update type.
  • the location update type indicates that this is a normal location update process.
  • Step 305 the VLR performs a location update process of the CS domain.
  • Step 306 After the CS domain location update succeeds, the VLR returns a location update success message to the MME, where the message carries the VLR TMSL.
  • Step 307 The MME returns a TAU accept message to the UE, and carries the CS location update success.
  • Parameters such as LAI, VLR TMSI and other parameters, indicate that the location update is successful in CS.
  • the IMS session indication will also be sent to the UE.
  • the UE is attached to the EPS to implement the voice service.
  • the UE can perform the EPS/CS joint registration or the TA/LA location update design process to ensure that the UE can use the voice service normally.
  • the UE has two optional attributes, one is "voice centric", that is, the voice center attribute. If the UE is a voice center attribute, it needs to be attached to a wireless network with voice service capability, and the voice service can be performed at any time. The other is "Data centric", that is, the data center attribute. If the UE is a data center attribute, it needs to be attached to an EPS network that does not support voice services, and realize data services at any time, such as the above network, downloading data, and the like.
  • Step 401 the UE selects by user or A UE that subscribes to the "voice centric" attribute needs to implement voice services.
  • the UE initiates an attach request to the MME through the E-UTRAN, and carries an "attach type" parameter in the request message.
  • the attach type identifier UE requests the EPS/IMSI joint registration, and notifies the network UE that the CS network can be used.
  • Step 402 The MME authenticates the UE, downloads the subscription data of the UE from the HSS, and applies to the S-GW and the P-GW to establish a default bearer.
  • Step 403 The MME allocates a locally configured default LAI, and finds the VLR number according to the allocated LAI, and then initiates a location update request to the MSC/VLR.
  • Step 404 The MME sends a location update request to the VLR, where the message includes a new LAI, an IMSI, an IP address of the MME, and a location update type.
  • Step 405 The VLR and the MME establish a security association on the bearer SGs interface, and perform a location update process in the CS domain. If the CS network authentication fails, such as no user data, user subscription restrictions, etc., the CS location update will fail.
  • Step 406 The VLR returns a location update failure message to the MME.
  • Step 407 The MME sends an attach success message to the UE, where the message carries only the relevant parameters of the EPS, and does not carry the relevant parameters of the CS location update, and the UE can determine that the EPS is successfully attached but the CS is not attached. Successfully, the UE cannot attach to the EPS network to implement voice services.
  • Step 408 The UE determines that it is a "voice centric" attribute, and needs to implement a voice service.
  • Step 409 The UE actively initiates a logout request to the EPS network, and cancels the EPS network attached to the CS joint registration failure.
  • Steps 410 - 411 the EPS network releases the resources established by the UE, and notifies the UE that the logout is successful.
  • the UE can attach to the EPS, but cannot initiate a CS call through the IMS or CS domain. Even if the EPS is successfully attached, the UE needs to perform EPS logout and try to register on other RAT (Radio Access Technology) networks. At this time, the EPS/CS has one more registration and cancellation process, which occupies limited network resources;
  • the UE may also continue to try to register with other E-UTRANs, which consumes more network resources, and the UE cannot use the CS service during this period, which seriously affects the user's voice service usage and user experience.
  • Step 501 The UE selects or signs a UE that is a "voice centric" attribute, and needs to implement a voice service and attach to the EPS/CS network.
  • the UE moves to the new TA and the new TA does not belong to the TA list of the original MME, the UE needs to perform the TA/LA update procedure and re-establish the SGs security association.
  • Step 502 The UE initiates a TAU request to the target MME, where the request message carries an update type parameter, indicating that this is a TA/LA joint update request.
  • Step 503 The EPS network performs a TAU process, and the target MME downloads the user subscription data of the UE from the HSS, and applies to the S-GW and the P-GW to establish a default bearer, and the UE switches from the original MME to the target MME.
  • Step 504 For the VLR alliance information in the MM context, the VLR alliance information needs to be updated according to the new LA information.
  • the target MME initiates a location update request to the VLR, carrying the channel LAI, IMSI, the IP address of the MME, and the location update type.
  • the location update type indicates that this is a normal location update process.
  • Step 505 the VLR performs a location update process of the CS domain. If the CS network authentication fails, such as no user data, limited user subscription, etc., the CS location update will fail.
  • Step 506 The VLR returns a location update failure message to the MME.
  • Step 507 The MME sends an attach success message to the UE, where the message carries only the relevant parameters of the EPS, and does not carry the relevant parameters of the CS location update.
  • the UE can determine that the EPS is successfully attached but the CS attachment is unsuccessful, and the UE cannot attach to the EPS network to implement the voice service.
  • Step 508 The UE determines that it is a "voice centric" attribute, and needs to implement a voice service.
  • Step 510 511 the EPS network is released as a resource established by the UE, and is successfully logged out by the UE.
  • Step 512 The UE needs to try to find other wireless networks for attachment and joint registration. If the joint registration is unsuccessful, the processes of steps 501 to 511 are repeated until an available CS network is found.
  • the UE when the UE is set to the "Voice Centric" attribute, if the TA/LA joint update fails and the EPS does not support the IMS session, the UE may update the location to the new EPS wireless network, but may not initiate CS through the IMS or CS domain. call. Even if the EPS location update is successful, the UE needs to perform EPS logout and try to register with other RAT networks. At this time, the EPS/CS has one more registration and cancellation process, which occupies limited network resources;
  • the UE may also continue to try to attach to other E-UTRANs, which consumes more network resources, and the UE cannot use the CS service during this period, which seriously affects the user's voice service usage and user experience. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method and system for network management circuit switched voice fallback, which solves the problem that the UE fails to jointly register or jointly update the location in the EPS network in the prior art.
  • the UE needs to initiate EPS logout, which causes the problem of consuming more network resources.
  • the present invention provides a method for network management circuit switched voice fallback, including:
  • the user equipment (UE) of the voice center attribute initiates a joint registration or joint location update request of the EPS network and the circuit switched (CS) network in an evolved packet domain system (EPS) network, if the EPS network initiates to the CS network
  • the location update fails, and the EPS network does not support IP Multimedia Subsystem (IMS) voice service, and the EPS network determines that the UE is a voice center attribute and rejects the request of the UE.
  • IMS IP Multimedia Subsystem
  • the above methods also include:
  • the EPS network After the UE initiates the joint registration or joint location update request of the EPS network and the CS network in the EPS network, the EPS network first attempts to initiate a location update to the CS network, and if the location update succeeds, the EPS bearer is established.
  • the step of the EPS network determining that the UE is a voice center attribute includes:
  • the EPS network determines that the UE is a voice center attribute according to an attribute parameter in the subscription data of the UE.
  • the above methods also include:
  • the EPS network carries a wireless network address list supporting the voice service in the message rejecting the request of the UE;
  • the UE attempts to attach to other wireless networks supporting voice services according to the received wireless network address list supporting the voice service.
  • the above methods also include:
  • the UE directly initiates CS attach to the 2G or 3G wireless network.
  • the above methods also include:
  • the EPS network carries the reason for the rejection in the message rejecting the request of the UE, and informs the UE that the wireless network does not support the voice service.
  • the present invention also provides a system for network management circuit switched voice fallback, including a UE and an EPS network.
  • the UE is a voice center attribute, and is configured to initiate a request for joint registration or joint location update of the EPS network and the CS network in the EPS network;
  • the EPS network does not support the IMS voice service, and is configured to: after receiving the request for the UE to initiate the joint registration or the joint location update, if the location update initiated by the CS network fails, and the UE is determined to be a voice center attribute, Then the request of the UE is rejected.
  • the EPS network is further configured to: after receiving the request for the joint registration or the joint location update, first attempt to initiate a location update to the CS network, and if the location update is successful, establish an EPS bearer.
  • the EPS network is further configured to: determine that the UE is a voice center according to an attribute parameter that is carried when the UE initiates a joint registration or a joint location update request in the EPS network, or according to an attribute parameter in the subscription data of the UE. Attributes.
  • the EPS network is further configured to: carry a wireless network address list supporting the voice service in the message rejecting the request of the UE;
  • the UE is further configured to: select to access other wireless networks supporting voice services according to the received wireless network address list supporting the voice service.
  • the present invention further provides an evolved packet domain system (EPS), where the EPS does not support the voice protocol of the Internet Protocol multimedia subsystem, and the EPS is set as:
  • EPS evolved packet domain system
  • the request to reject the UE is further set to: After receiving the request for the joint registration or joint location update, First try to initiate a location update to the CS network. If the location update is successful, then establish an EPS bearer.
  • the EPS network is further configured to: determine that the UE is a voice center according to an attribute parameter that is carried when the UE initiates a joint registration or a joint location update request in the EPS network, or according to an attribute parameter in the subscription data of the UE. Attributes.
  • the EPS network is further configured to: carry a list of wireless network addresses supporting the voice service in the message rejecting the request of the UE.
  • the EPS network does not need to establish a new EPS bearer for the UE, and the UE does not need to initiate the EPS logout actively, but can directly try to attach to the wireless supporting the voice service.
  • the internet The valuable resources of the network are greatly saved, and the speed of the UE connecting to the wireless network supporting the voice service is greatly improved, and the user experience of the voice service is improved to a certain extent.
  • FIG. 1 is a schematic diagram of a frame for implementing a voice fallback function
  • FIG. 2 is a flow chart of a joint registration of an existing UE with voice fallback capability on an EPS network/CS network;
  • FIG. 3 is a flow chart of a joint location update of an existing UE with voice fallback capability on an EPS network/CS network;
  • FIG. 4 is a flowchart of a failure of a UE with voice dropback capability to perform joint registration on an EPS network/CS network;
  • FIG. 5 is a flowchart of a failure of a UE with voice dropback capability to perform joint location update on an EPS network/CS network;
  • FIG. 6 is a flowchart of a UE with voice dropback capability for joint registration failure in an EPS network/CS network;
  • FIG. 7 is a flowchart of a UE with voice fallback capability performing joint location update failure in an EPS network/CS network.
  • the UE of the voice center attribute initiates the joint registration or joint location update request of the EPS network and the CS network in the EPS network
  • the EPS network determines that the UE is a voice center attribute and directly rejects the request of the UE.
  • the UE can attempt to attach to other wireless networks supporting voice services in time.
  • the EPS network first attempts to initiate a location update to the CS network, and if the location update succeeds, the EPS bearer is established; If the update fails, the EPS bearer is no longer established.
  • the EPS network does not support the IMS voice service.
  • the UE needs to use the CS network to implement the voice service through the CS network.
  • the EPS network After the UE initiates the joint registration request, if the EPS network fails in the location update of the CS, the EPS network needs to determine whether the UE is a voice center attribute UE, and if it is a voice center attribute, directly rejects the UE attach request, and notifies the UE that the support is not supported. For voice services, the UE attempts to connect to other supporting voice networks.
  • Step 601 The UE sends an attach request to the MME through the E-UTRAN, and carries an "attach type" parameter in the request message.
  • the attach type identifier UE requests the EPS/IMSI joint registration, and notifies the network UE that the CS network can be used.
  • the UE if the UE can support the "voice centric" attribute, or the "voice centric” attribute and the “data centric” attribute, the UE notifies the MME of the configured "voice centric" attribute in the request message.
  • the UE can also configure only one attribute in the subscription data.
  • the above network card only has the "data centric" attribute.
  • Step 602 The MME authenticates the UE, downloads subscription data of the UE from the HSS, and applies for establishing an EPS bearer (default bearer) to the S-GW and the P-GW.
  • the MME may obtain the attribute parameter from the request message, and learn that the UE is a voice center attribute. If the request message is not carried, the MME needs to obtain the attribute parameter from the subscription data of the UE, and determine that the UE is a voice center attribute.
  • the process of applying for establishing an EPS bearer in this step may be placed after the step 606 CS location update response message. If the CS location update fails, the process of applying for an EPS bearer is not performed.
  • Step 603 The MME allocates a locally configured default LAI, and finds the VLR number according to the allocated LAI, and then initiates a location update request to the MSC/VLR.
  • Step 604 The MME sends a location update request to the VLR, where the message includes new LAI, IMSI, IP address of the MME, location update type, and the like.
  • Step 605 The VLR and the MME establish a security association on the bearer SGs port, and the VLR performs a location update process in the CS domain. For some reason, the CS domain location update fails. If there is no user data, limited area, and restricted subscription, the CS location update may fail.
  • Step 606 The VLR returns a location update failure message to the MME.
  • Step 607 After receiving the CS domain location update failure message, the MME determines whether the attribute of the UE is a voice center attribute, and if the UE is a voice center attribute, rejects the UE attach request.
  • Step 608 The MME sends an attach reject message to the UE, rejecting the EPS attach request of the UE.
  • the reason why the rejection can be carried further in the attachment rejection message The existing EPS wireless network does not support the voice service.
  • the attachment reject request message may carry an address list of other wireless networks that support the voice service statically configured on the MME, and send the address list to the UE.
  • the UE may initiate an attach request based on the wireless network address supporting the voice service.
  • Step 609 The UE attempts to initiate an attach request to other wireless networks supporting voice services.
  • the UE may directly initiate CS attachment to the 2G or 3G wireless network.
  • Embodiment 2 Referring to FIG. 7, the EPS network does not support the IMS voice service, and the UE needs to implement the voice service by using the CS network through the CS fallback technology.
  • the EPS network After the UE location changes and initiates the joint location update request, if the EPS network fails in the location update of the CS, the EPS network needs to determine whether the UE is a voice center attribute UE, and if it is a voice center attribute, directly rejects the UE joint location update request. And notifying the UE that the wireless network does not support voice services, and the UE attempts location update to other supporting voice networks.
  • the TA/LA (tracking area/location area) update process initiated by the UE in the second embodiment includes the following steps:
  • Step 701 The UE finds that the new TA is not in the TA list of the original MME, and the UE needs to perform the TA/LA update process and re-establish the SGs security association.
  • Step 702 The UE initiates a TAU request to the target MME, where the request message carries an update type parameter, indicating that this is a TA/LA joint update request.
  • the UE if the UE can support the "voice centric" attribute, or the "voice centric” attribute and the “data centric” attribute, the UE notifies the MME of the configured "voice centric" attribute in the request message.
  • the UE can also configure only one attribute in the subscription data.
  • the above network card only has the "data centric" attribute.
  • Step 703 The EPS network performs a TAU process, and the target MME downloads the subscription data of the UE from the HSS, and applies to the S-GW and the P-GW to establish an EPS bearer (the default bearer), and the UE switches from the original MME to the target MME.
  • EPS bearer the default bearer
  • the target MME may obtain the attribute parameter from the request message, and learn that the UE is a voice center attribute. If the request message is not carried, the target MME needs to obtain the attribute parameter from the subscription data of the UE, and determines that the UE is a voice center attribute.
  • this step applies to establish an EPS bearer and is in the original MME and target.
  • the process of bearer handover between MMEs can be placed after the step 706 CS location update response message. If the CS location update fails, the process of establishing an EPS bearer and bearer handover procedure is not performed.
  • Step 704 For the VLR alliance information in the MM context, the VLR alliance information needs root. Updated according to the new LA information.
  • the target MME initiates a location update request to the VLR, carrying the new LAI, IMSI, the IP address of the MME, and the location update type.
  • the location update type indicates that this is a normal location update process.
  • Step 705 the VLR performs a location update process of the CS domain. For some reason, the CS domain location update fails. If there is no user data, limited area, and restricted subscription, the CS location update may fail.
  • Step 706 The VLR returns a location update failure message to the MME.
  • Step 707 After receiving the CS domain location update failure message, the target MME determines whether the UE attribute is a voice center attribute, and if the UE is a voice center attribute, rejects the TA/LA location update request of the UE.
  • Step 708 The MME sends a location update reject message to the UE, rejecting the TA/LA location update request of the UE.
  • Reasons for further rejection in the location update rejection request The updated EPS wireless network does not support voice services.
  • the location update reject request message may carry the address list of the wireless network that supports the voice service that is statically configured on the MME, and sends the address list to the UE.
  • the UE may initiate a location update request based on the wireless network address supporting the voice service.
  • Step 709 The UE attempts to initiate a location update request to other wireless networks supporting voice services. After the UE performs the logout at the original MME due to the location movement, the UE may directly initiate an attach request to other wireless networks. If the rejection message does not carry the address list of the wireless network, the UE may directly initiate CS attachment to the 2G/3G wireless network.
  • the present invention solves the problem that the UE in the voice center attribute fails to initiate the joint registration/joint location update, optimizes the network resource configuration, and shortens the time when the UE attaches to the wireless network with the voice service capability.
  • the EPS network can determine whether the UE is The voice center attribute, when the joint registration or joint location update fails, if the UE is a voice center attribute, directly rejects the EPS/CS joint registration request or the TA/LA joint location update request initiated by the UE, and informs the UE that the existing wireless network does not support For voice services, the UE can directly initiate service requests to other wireless networks that support voice services.
  • the user realizes the voice service in the EPS network/CS network, enhances the user's voice experience, and improves user satisfaction.
  • the EPS network does not need to establish a new EPS bearer for the UE, and the UE does not need to initiate the EPS logout actively, but can directly try to attach to the wireless supporting the voice service.
  • the internet The valuable resources of the network are greatly saved, and the speed of the UE connecting to the wireless network supporting the voice service is greatly improved, and the user experience of the voice service is improved to a certain extent.

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Description

一种网络管理电路交换语音回落的方法和系统
技术领域
本发明涉及通信领域，尤其涉及一种网络管理电路交换（ Circuit Switched, 简称 CS )语音回落的方法和系统。 背景技术
为了保持第三代移动通信系统在移动通信领域的强有力的竟争力， 必须 提高其网络性能和降低网络建设和运营成本。 因此， 3GPP ( 3rd Generation Partnership Project, 第三代合作伙伴计划）的标准化工作组目前正致力研究对 PS Core( Packet Switched Core,分组交换核心网）和 UTRAN( Universal Mobile Telecommunication System Radio Access Network,全球移动通信系统无线接入 网） 的演进， 目的是使得演进的 PS Core( (简称 EPC )可提供更高的传输速 率，更短的传输延时，并支持 E-UTRAN( Evolved UTRAN,演进的 UTRAN )、 GERAN ( GSM EDGE radio access network, GSM EDGE无线接入网， 其中 GSM是 Global System for Mobile communications的缩写， 即全球移动通讯系 统， EDGE是 Enhanced Data Rate for GSM Evolution的缩写， 即增强型数据速 率 GSM演进技术） 、 UTRAN、 WLAN ( Wireless Local Area Network, 无线 局域网）及其它非 3GPP的接入网络之间的移动性管理。 这个演进的移动通 信系统， 就被称为 EPS ( Evolved Packet System, 演进的分组域系统） ， 其基 本架构如图 1虚线框中所示。 图 1中各实体说明如下：
UE ( User Equipment, 用户设备， 或称为终端） 101 : 具有能接入两种无 线网络能力的终端称为双模终端。 按照同时接入无线网络的能力， 双模终端 又可以分为单无线信道接入和双无线信道接入终端。 前者在同一时间只能接 入一种无线网络； 后者可以同时接入到两种无线接入网络中。
E-UTRAN 102: 演进的无线接入网， 可以提供更高的上下行速率， 更低 的传输延迟和更加可靠的无线传输。
S-GW ( Serving Gateway, 服务网关） 103 , 是一个用户面实体， 负责用户 面数据路由处理。
P-GW( Packet Data Network Gateway,分组数据网网关，简称 PDN GW或 P-GW ) 104, 负责 UE接入 PDN ( Packet Data Network, 分组数据网）的网关 功能。 P-GW和 S-GW可能合设在一个物理实体中。
MME ( Mobility Management Entity, 移动性管理实体） 105, 是一个控制 面实体，临时存储用户数据的服务器， 负责管理和存储 UE上下文（比如 UE/ 用户标识， 移动性管理状态， 用户安全参数等） ， 为用户分配临时标识， 当 UE驻扎在该跟踪区域或者该网络时负责对该 UE进行鉴权。
HSS ( Home Subscriber Server, 归属用户服务器） 106, 包含 HLR ( Home Location Register, 归属位置寄存器）功能， 保存有用户的基本数据和业务数 据。
IP ( Internet Protocol, 互联网协议） 多媒体子系统 ( IP Multimedia Core Network Subsystem, 简称 IMS )是由 3GPP提出的一种基于 IP的网络架构， 其构建了一个开放而灵活的业务环境， 支持多媒体应用， 并为用户提供丰富 的多媒体业务。 IMS是基于 IP的电信网络架构， 与接入技术无关， 除了可以 为 EPS、 GPRS ( General Packet Radio Service, 通用分组无线业务） 、 WLAN ( Wireless Local Area Network, 无线局域网 )等分组接入网络提供业务外， 也可以为 GSM、 UMTS ( Universal Mobile Telecommunications System, 通用 移动通信系统）等移动蜂窝网络提供业务。
GERAN/UTRAN 107： 传统 GSM/UMTS网络的无线接入网。
MSC ( Mobile Switching Center, 移动交换中心） /VLR ( Visitor Location Register, 拜访位置寄存器） 108, 其中， VLR通常位于 MSC上。
GMSC ( Gateway Mobile Switching Center , 关口移动交换中心） 109。
SGSN( Serving GPRS Support Node, GPRS服务支持节点） 110,是 GPRS 网络的控制网元， 主要作用是记录 UE 的位置信息， 并且在 UE和 GGSN ( Gateway GPRS Supporting Node, GPRS网关支持节点）之间完成移动分组 数据的发送和接收。
当 UE在 GSM或 UMTS网络接入时， 用户的基本语音业务以及基于语 音业务的补充业务是通过〇8域（或称为 CS网络 )提供的，图 1中的 MSC/VLR、 GMSC属于 CS域网元， 用户通过 CS域可以与本网内或者其它网络（比如固 定电话网、其它移动网）的用户进行语音呼叫类业务。 用户的 IP业务通过 PS ( Packet Switched, 分组交换）域提供。 图 1中 SGSN属于 PS域网元。 用户 通过 PS域来访问分组数据网， 图 1中运营商提供的 IP网络就是分组数据网。
现有技术中， MSC/VLR和 SGSN之间的接口称为 Gs接口。 Gs接口完成 在 MSC/VLR和 SGSN之间建立 Gs关联关系 （在 SGSN保存 VLR号码， 在 VLR保存 SGSN号码 ) , 和在建立 Gs关联关系后 MSC/VLR通过 PS域寻呼 到被叫用户的 UE。
现有技术中， MSC/VLR和 MME之间的接口称为 SGs接口。 SGs接口完 成在 MSC/VLR和 MME之间建立 SGs关联关系 （在 MME保存 VLR号码 , 在 VLR保存 MME地址） 。
当 UE在 EPS网络接入时， 用户的基本语音业务以及基于语音业务的补 充业务是通过 IMS控制的， EPS本身并不能提供和控制语音呼叫业务， 只能 提供 IP数据的承载。 但是在 EPS网络部署时， 有些运营商只在 UMTS/GSM 网络已经覆盖的重点区域部署 EPS网络，用来为用户提供高速的 IP数据业务， 没有 （或不想）部署 IMS , 此种场景下， 运营商希望通过已经全面覆盖的 UMTS/GSM CS网络来提供语音呼叫业务、 短信业务、 定位业务、 非结构化 的补充业务等 CS 网络业务。 但是对于单无线信道的双模终端而言， 当接入 EPS 网络时用户就无法进行上述的语音呼叫等业务。 为了保证用户能够进行 语音呼叫等业务， 一种最简单也是 3GPP现阶段唯一支持的解决方案就是在 进行语音呼叫等业务时， 让 UE从 EPS网络接入切换为从 UMTS/GSM网络 接入， 在 UMTS/GSM CS域网络来实现语音业务。 当 UE在 EPS网络发起语 音呼叫时， 会先通知 EPS网络， EPS网络将 UE切换到 GSM/UMTS网络， 使 UE能在 CS网络进行语音业务。 用户在 EPS网络当前正在进行的 IP业务切 换到 UMTS/GSM PS域网络，如果正在进行的 IP业务不能切换到 UMTS/GSM PS域， 就在 EPS 网络中挂起或者释放。 这就是通常所说的电路域回落（CS fallback, 或者称为 CS回落） 。
现有的电路域回落实现方法大致如下： 在 MME和 MSC/VLR之间引入 一个类似 Gs的接口， 称为 SGs (如图 1中所示）。 当 UE开机接入 EPS网络 时， MME和 MSC/VLR之间通过 SGs接口建立 SGs关联关系（在 MME中保 存 VLR号码， 在 VLR中保存 MME地址 ) 。 后续当用户在网络中移动时， 用户的最新位置信息会更新到 MME, 如果 MME发生变化， VLR中保存的 MME信息也会更新 , 保证 VLR中保存的 MME信息总是准确的。
在接入 EPS网络的 UE发起语音呼叫等业务时， UE给 E-UTRAN发送一 个特定的消息， E-UTRAN收到该消息后发起切换流程，将用户当前正在进行 的 IP业务切换到 UMTS/GSM PS网络或者在 EPS网络挂起等，然后 UE接入 UMTS/GSM网络并在 CS网络发起语音呼叫等业务的流程。
在接入 EPS网络的 UE作为 CS业务的被叫 （收到语音呼叫等业务） 时，
MSC/VLR通过 SGs接口给 EPS网络发 CS寻呼消息， EPS网络接收到 CS寻 呼请求消息， 进行电路域回落。
若网络不支持 IMS语音业务， UE只能通过 CS回落技术， 釆用 CS网络 实现语音业务。具有 CS回落能力的 UE在 EPS网络进行附着并向 CS网络联 合注册的现有技术如下所述， 见图 2。
UE发起的 EPS和 CS附着流程包含如下步骤：
步骤 201 , UE向通过 E-UTRAN向 MME发起附着请求 , 在请求消息中 携带 "附着类型"参数，附着类型标识 UE请求的是 EPS和 IMSI ( International Mobile Subscriber Identity, 国际移动用户识别码）联合注册， 并通知网络 UE 可以使用 CS网络。
步骤 202, MME对 UE进行认证， 从 HSS下载 UE的签约数据， 并向 S-GW及 P-GW申请建立默认承载。
步骤 203 , MME 分配一个本地配置的默认的 LAI ( Location Area Identifier, 位置区识别码） ， 并根据分配的 LAI找到 VLR 的号码， 然后向 MSC/VLR发起位置更新请求。
步骤 204 , MME发送位置更新请求给 VLR , 消息中包含新的 LAI , IMSI, MME的 IP地址，位置更新类型等信息。
步骤 205 , VLR与 MME之间建立起承载 SGs口之上的安全联盟。 步骤 206 , VLR在 CS域执行位置更新过程。
步骤 207 , CS域位置更新成功后， VLR向 MME返回位置更新成功消息， 消息中携带 VLR TMSI ( Temporary Mobile Subscriber Identity, 临时移动用户 识别码） 。
步骤 208, MME发送附着成功消息给 UE, 消息中除携带 EPS的相关参 数外， 同时携带 CS位置更新相关参数， 如 LAI, VLR TMSI等参数， UE判 断联合注册成功， UE可以釆用 CS回落的方式实现语音业务。
具有 CS回落能力的 UE在 EPS网络进行 TAU ( Tracked Area Update,跟 踪区域更新 )并向 CS网络联合位置更新的现有技术如下所述， 见图 3。
UE发起的 TA/LA (跟踪区域和位置区域） 更新流程包含如下步骤：
步骤 301 , UE发现移动到新的 TA, 新 TA不属于原 MME的 TA列表， UE需要执行 TA/LA更新流程， 并重新建立 SGs安全联盟。
步骤 302 , UE向目标 MME发起 TAU请求， 请求消息中携带更新类型 参数， 指示这是 TA/LA联合更新请求。
步骤 303 , EPS网络执行 TAU过程， 目标 MME从 HSS下载 UE的用户 签约数据， 并向 S-GW及 P-GW申请建立默认承载， 执行 UE从原 MME切 换到目标 MME的过程。
步骤 304,对于 MM ( Mobility Management, 移动管理）上下文中有 VLR 联盟信息 , VLR联盟信息需要根据新的 LA信息更新。 目标 MME向 VLR发 起位置更新请求， 携带新的 LAI, IMSI, MME的 IP地址， 位置更新类型。 位置更新类型指示这是一个正常的位置更新过程。
步骤 305, VLR执行 CS域的位置更新过程。
步骤 306, CS域位置更新成功后， VLR向 MME返回位置更新成功消息， 消息中携带 VLR TMSL
步骤 307 , MME向 UE返回 TAU接受消息， 并携带 CS位置更新成功的 参数， 如 LAI, VLR TMSI等参数， 指示在 CS也位置更新成功。 同时 EPC 网络若支持 IMS会话， 也会将支持 IMS会话指示发给 UE。
如上所述，现有技术中， UE附着到 EPS实现语音业务釆用 UE可以进行 EPS/CS联合注册或 TA/LA位置更新设计的流程，可以保证 UE可正常使用语 音业务。
现有技术中， UE有两种可选的属性， 一个是 "voice centric" 即语音中心 属性， 若 UE是语音中心属性， 就需要附着在具有语音业务能力的无线网络， 随时可进行语音业务。 另一种是 " Data centric" 即数据中心属性， 若 UE是数 据中心属性， 则需要可以附着在不支持语音业务的 EPS网络， 随时实现数据 业务， 如上网、 下载数据等。
对于 UE发起的注册流程， 若 UE无法联合注册成功， UE又是 "voice centric" 属性， 必须要实现语音业务， 现有的解决方法如下所述， 见图 4: 步骤 401 , UE通过用户选择或签约是 "voice centric" 属性的 UE, 需要 实现语音业务。 UE向通过 E-UTRAN向 MME发起附着请求 , 在请求消息中 携带 "附着类型" 参数， 附着类型标识 UE请求的是 EPS/IMSI联合注册， 并 通知网络 UE可以使用 CS网络。
步骤 402, MME对 UE进行认证， 从 HSS下载 UE的签约数据， 并向 S-GW、 P-GW申请建立默认承载。
步骤 403 , MME分配一个本地配置的默认的 LAI, 并根据分配的 LAI 找到 VLR的号码， 然后向 MSC/VLR发起位置更新请求。
步骤 404 , MME发送位置更新请求给 VLR , 消息中包含新的 LAI , IMSI, MME的 IP地址，位置更新类型等信息。
步骤 405, VLR与 MME之间建立起承载 SGs口之上的安全联盟， 并在 CS域执行位置更新过程。 若 CS网络认证失败， 如无用户数据、 用户签约受 限等原因， 会造成 CS位置更新失败。
步骤 406, VLR将位置更新失败消息返回给 MME。
步骤 407, MME发送附着成功消息给 UE,消息中只携带 EPS的相关参 数， 不携带 CS位置更新相关参数， UE可以判断 EPS附着成功但 CS附着不 成功， UE无法附着在 EPS网络实现语音业务。
步骤 408, UE判断是 "voice centric" 属性， 需要实现语音业务。
步骤 409, UE主动向 EPS网络发起注销请求，取消附着在 CS联合注册 失败的 EPS网络。
步骤 410 - 411 , EPS网络释放为 UE建立的资源， 并通知 UE注销成功。 步骤 412, UE需要尝试寻找其它的无线网络进行附着并联合注册， 若联 合注册不成功就重复步骤 401 ~ 411的流程， 直到寻找到可用的 CS网络。
如上所述， 在 UE设置为 "Voice Centric" 属性下， 若 EPS/CS联合注册 失败且 EPS不支持 IMS会话时， UE可以附着到 EPS,但不能通过 IMS或 CS 域发起 CS呼叫。 即使在 EPS附着成功， UE也需要执行 EPS注销， 并尝试在 其它 RAT( Radio Access Technology,无线接入技术）网络注册。此时的 EPS/CS 多了一次注册与注销过程， 占用了有限的网络资源；
UE还可能不断尝试到其它 E-UTRAN进行注册，就会消耗更多网络资源， 并且 UE在此期间并不能使用 CS业务，严重影响了用户的语音业务使用与用 户体验。
对于 UE发起的 TAU/LAU位置更新流程，若 UE无法联合位置更新成功， UE又是 "voice centric"属性， 必须要实现语音业务， 现有的解决方法如下所 述， 见图 5:
步骤 501 , UE通过用户选择或签约是 "voice centric" 属性的 UE, 需要 实现语音业务， 并附着到了 EPS/CS网络。 当 UE移动到新的 TA, 新 TA不 属于原 MME的 TA列表， UE需要执行 TA/LA更新流程， 并重新建立 SGs 安全联盟。
步骤 502, UE向目标 MME发起 TAU请求， 请求消息中携带更新类型 参数， 指示这是 TA/LA联合更新请求。
步骤 503 , EPS网络执行 TAU过程， 目标 MME从 HSS下载 UE的用户 签约数据， 并向 S-GW及 P-GW申请建立默认承载， UE从原 MME切换到目 标 MME。 步骤 504, 对于 MM上下文中有 VLR联盟信息， VLR联盟信息需要根 据新的 LA信息更新。 目标 MME向 VLR发起位置更新请求 , 携带信道 LAI , IMSI, MME的 IP地址， 位置更新类型。 位置更新类型指示这是一个正常的 位置更新过程。
步骤 505, VLR执行 CS域的位置更新过程。 若 CS网络认证失败， 如无 用户数据、 用户签约受限等原因， 会造成 CS位置更新失败。
步骤 506, VLR将位置更新失败消息返回给 MME。
步骤 507, MME发送附着成功消息给 UE,消息中只携带 EPS的相关参 数， 不携带 CS位置更新相关参数， UE可以判断 EPS附着成功但 CS附着不 成功， UE无法附着在 EPS网络实现语音业务。
步骤 508, UE判断是 "voice centric" 属性， 需要实现语音业务； 步骤 509, UE主动向 EPS网络发起注销请求，取消附着在 CS联合注册 失败的 EPS网络；
步骤 510 511 , EPS网络释放为 UE建立的资源， 并通过 UE注销成功。 步骤 512, UE需要尝试寻找其它的无线网络进行附着并联合注册， 若联 合注册不成功就重复步骤 501 ~ 511的流程， 直到寻找到可用的 CS网络。
如上所述， 在 UE设置为 "Voice Centric" 属性下， 若 TA/LA联合更新 失败且 EPS不支持 IMS会话时， UE可以位置更新到新的 EPS无线网络， 但 不能通过 IMS或 CS域发起 CS呼叫。 即使在 EPS位置更新成功， UE也需要 执行 EPS注销， 并尝试在其它 RAT网络注册。 此时的 EPS/CS多了一次注册 与注销过程， 占用了有限的网络资源；
UE还可能不断尝试到其它 E-UTRAN进行附着，就会消耗更多网络资源， 并且 UE在此期间并不能使用 CS业务，严重影响了用户的语音业务使用与用 户体验。 发明内容
本发明要解决的技术问题就是提出一种网络管理电路交换语音回落的方 法和系统，解决现有技术中 UE在 EPS网络中联合注册或联合位置更新失败， EPS网络不支持语音业务时， UE需要主动发起 EPS注销， 造成消耗较多网 络资源的问题。
为了解决上述技术问题， 本发明提供一种网络管理电路交换语音回落的 方法， 包括：
语音中心属性的用户设备 ( UE )在演进的分组域系统（EPS ) 网络中发 起 EPS网络和电路交换（CS ) 网络的联合注册或联合位置更新的请求后， 若 所述 EPS网络向 CS网络发起的位置更新失败，且所述 EPS网络不支持 IP多 媒体子系统（IMS )语音业务， 所述 EPS网络判断所述 UE为语音中心属性， 拒绝所述 UE的请求。
上述方法还包括：
所述 UE在 EPS网络中发起 EPS网络和 CS网络的联合注册或联合位置 更新的请求后， 所述 EPS网络先尝试向 CS网络发起位置更新， 若位置更新 成功， 再建立 EPS承载。
上述方法还可具有以下特点：
所述 EPS网络判断所述 UE为语音中心属性的步骤包括：
所述 EPS网络根据所述 UE在 EPS网络中发起联合注册或联合位置更新 的请求时携带的属性参数， 判断所述 UE为语音中心属性；
或者， 所述 EPS网络根据所述 UE的签约数据中的属性参数， 判断所述 UE为语音中心属性。
上述方法还包括：
所述 EPS网络在拒绝所述 UE的请求的消息中， 携带支持语音业务的无 线网络地址列表；
所述 UE根据接收到的所述支持语音业务的无线网络地址列表， 尝试附 着到其它支持语音业务的无线网络。
上述方法还包括：
若所述 EPS网络拒绝所述 UE的请求的消息中， 未携带支持语音业务的 无线网络地址列表， 则所述 UE直接向 2G或 3G无线网络发起 CS附着。 上述方法还包括：
所述 EPS网络在拒绝所述 UE的请求的消息中携带拒绝的原因， 告知所 述 UE无线网络不支持语音业务。
为了解决上述技术问题， 本发明还提供一种网络管理电路交换语音回落 的系统， 包括 UE和 EPS网络，
所述 UE为语音中心属性，其设置为：在 EPS网络中发起 EPS网络和 CS 网络的联合注册或联合位置更新的请求；
所述 EPS网络不支持 IMS语音业务， 其设置为： 接收到所述 UE发起联 合注册或联合位置更新的请求后， 若向 CS 网络发起的位置更新失败， 且判 断所述 UE为语音中心属性， 则拒绝所述 UE的请求。
上述系统还可具有以下特点：
所述 EPS网络还设置为：接收到所述联合注册或联合位置更新的请求后， 先尝试向 CS网络发起位置更新， 若位置更新成功， 再建立 EPS承载。
上述系统还可具有以下特点：
所述 EPS网络还设置为： 根据所述 UE在 EPS网络中发起联合注册或联 合位置更新的请求时携带的属性参数或者根据所述 UE的签约数据中的属性 参数， 判断所述 UE为语音中心属性。
上述系统还可具有以下特点：
所述 EPS网络还设置为： 在拒绝所述 UE的请求的消息中， 携带支持语 音业务的无线网络地址列表；
所述 UE还设置为： 根据接收到的所述支持语音业务的无线网络地址列 表， 选择接入其它支持语音业务的无线网络。
为了解决上述技术问题， 本发明还提供一种演进的分组域系统（EPS ) , 所述 EPS不支持互联网协议多媒体子系统语音业务， 该 EPS设置为：
接收到 UE发起的联合注册或联合位置更新的请求后，若向 CS网络发起 的位置更新失败， 且判断所述 UE为语音中心属性， 则拒绝所述 UE的请求 所述 EPS网络还设置为：接收到所述联合注册或联合位置更新的请求后， 先尝试向 CS网络发起位置更新， 若位置更新成功， 再建立 EPS承载。
所述 EPS网络还设置为： 根据所述 UE在 EPS网络中发起联合注册或联 合位置更新的请求时携带的属性参数或者根据所述 UE的签约数据中的属性 参数， 判断所述 UE为语音中心属性。
所述 EPS网络还设置为： 在拒绝所述 UE的请求的消息中， 携带支持语 音业务的无线网络地址列表。
通过本发明， 当 UE发起的联合注册或联合位置更新失败后， EPS 网络 不需要再为 UE建立新的 EPS承载， UE也不需要主动发起 EPS注销， 而直 接可以尝试附着到支持语音业务的无线网络。 大大节省了网络的宝贵资源， 也极大提高了 UE连接到支持语音业务的无线网络的速度， 一定程度上提高 了用户进行语音业务的用户体验。 附图说明
图 1为现有实现语音回落功能的框架示意图；
图 2为现有具有语音回落能力的 UE在 EPS网络 /CS网络进行联合注册 的流程图；
图 3为现有具有语音回落能力的 UE在 EPS网络 /CS网络进行联合位置 更新的流程图； ；
图 4为现有具有语音回落能力的 UE在 EPS网络 /CS网络进行联合注册 失败的流程图；
图 5为现有具有语音回落能力的 UE在 EPS网络 /CS网络进行联合位置 更新失败的流程图；
图 6为本发明的具有语音回落能力的 UE在 EPS网络 /CS网络进行联合 注册失败的流程图；
图 7为本发明的具有语音回落能力的 UE在 EPS网络 /CS网络进行联合 位置更新失败的流程图。 具体实施方式 在本发明中， 语音中心属性的 UE在 EPS网络中发起 EPS网络和 CS网 络的联合注册或联合位置更新的请求后， 若所述 EPS网络向 CS网络发起的 位置更新失败，且所述 EPS网络不支持 IMS语音业务，所述 EPS网络判断所 述 UE为语音中心属性， 直接拒绝所述 UE的请求。
这样， 所述 UE可及时尝试附着到其它支持语音业务的无线网络。
优选地， UE在 EPS网络中发起 EPS网络和 CS网络的联合注册或联合 位置更新的请求后， 所述 EPS网络先尝试向 CS网络发起位置更新， 若位置 更新成功， 再建立 EPS承载； 若位置更新失败， 则不再建立 EPS承载。
下面结合附图及具体实施例对本发明进行详细说明。
实施例一
参见图 6, EPS网络不支持 IMS语音业务， UE需要通过 CS回落技术 釆用 CS网络实现语音业务。 当 UE发起联合注册请求后， 若 EPS网络在 CS 进行位置更新时失败， EPS网络需要判断 UE是否是语音中心属性的 UE, 若 是语音中心属性， 就直接拒绝 UE的附着请求， 并通知 UE不支持语音业务， UE向其它支持语音网络尝试连接。
本实施例一中 UE发起的 EPS和 CS附着流程包含如下步骤：
步骤 601 , UE向通过 E-UTRAN向 MME发起附着请求 , 在请求消息中 携带 "附着类型" 参数， 附着类型标识 UE请求的是 EPS/IMSI联合注册， 并 通知网络 UE可以使用 CS网络。
UE发起请求时可携带的属性参数，用于告知 EPS网络该 UE为语音中心 属性；
具体地 ,若 UE可以西己置支持 "voice centric"属'! "生,或者, "voice centric" 属性和 "data centric" 属性， UE在请求消息中将配置的 "voice centric" 属性 告知 MME。
UE也可以在签约数据中只配置一种属性， 如上网卡只有 "data centric" 属性。
步骤 602, MME对 UE进行认证， 从 HSS下载 UE的签约数据， 并向 S-GW及 P-GW申请建立 EPS承载（默认承载 ) 。 MME可从请求消息中获取属性参数， 获知 UE为语音中心属性； 若请求 消息中没有携带， MME需要从 UE 的签约数据中获取属性参数， 判断所述 UE为语音中心属性；
进一步优化网络资源，本步骤申请建立 EPS承载的过程可以放在步骤 606 CS位置更新响应消息后面。 若 CS位置更新失败， 就不执行申请建立 EPS承 载的过程。
步骤 603 , MME分配一个本地配置的默认的 LAI, 并根据分配的 LAI 找到 VLR的号码， 然后向 MSC/VLR发起位置更新请求；
步骤 604 , MME发送位置更新请求给 VLR , 消息中包含新的 LAI , IMSI, MME的 IP地址， 位置更新类型等信息。
步骤 605 , VLR 与 MME之间建立起承载 SGs 口之上的安全联盟， VLR在 CS域执行位置更新过程。 因某种原因 CS域位置更新失败，如无用户 数据、 区域受限、 签约受限等因素， 可造成 CS位置更新失败。
步骤 606 , VLR向 MME返回位置更新失败消息。
步骤 607, MME收到 CS域位置更新失败消息后， 判断 UE的属性是否 是语音中心属性， 若 UE是语音中心属性， 就拒绝 UE的附着请求。
步骤 608, MME发送附着拒绝消息给 UE, 拒绝 UE的 EPS附着请求。 附着拒绝消息中进一步可以携带拒绝的原因： 现有 EPS无线网络不支持 语音业务。
更进一步， 附着拒绝请求消息中可以携带 MME上静态配置的其它支持 语音业务的无线网络的地址列表， 并下发给 UE。 UE可以根据支持语音业务 的无线网络地址发起附着请求。
步骤 609, UE尝试向其它支持语音业务的无线网络发起附着请求。
若拒绝消息中没有携带无线网络的地址列表， UE可直接向 2G或 3G无 线网络发起 CS附着。
实施例二 参见图 7, EPS网络不支持 IMS语音业务， UE需要通过 CS回落技术 釆用 CS网络实现语音业务。 当 UE位置改变并发起联合位置更新请求后， 若 EPS网络在 CS进行位置更新时失败， EPS网络需要判断 UE是否是语音中心 属性的 UE, 若是语音中心属性， 就直接拒绝 UE的联合位置更新请求， 并通 知 UE无线网络不支持语音业务， UE向其它支持语音网络尝试位置更新。
本实施例二中 UE发起的 TA/LA (跟踪区域 /位置区域)更新流程包含如下 步骤：
步骤 701 , UE发现移动到新的 TA, 新 TA不属于原 MME的 TA列表， UE需要执行 TA/LA更新流程， 并重新建立 SGs安全联盟。
步骤 702 , UE向目标 MME发起 TAU请求， 请求消息中携带更新类型 参数， 指示这是 TA/LA联合更新请求。
UE发起请求时可携带的属性参数，用于告知 EPS网络该 UE为语音中心 属性；
具体地 ,若 UE可以西己置支持 "voice centric"属'! "生,或者, "voice centric" 属性和 "data centric" 属性， UE在请求消息中将配置的 "voice centric" 属性 告知 MME。
UE也可以在签约数据中只配置一种属性， 如上网卡只有 "data centric" 属性。
步骤 703 , EPS网络执行 TAU过程， 目标 MME从 HSS下载 UE的签约 数据， 并向 S-GW及 P-GW申请建立 EPS承载（默认承载 ) , UE从原 MME 切换到目标 MME。
目标 MME可从请求消息中获取属性参数， 获知 UE为语音中心属性； 若请求消息中没有携带， 目标 MME需要从 UE的签约数据中获取属性参数， 判断所述 UE为语音中心属性
进一步优化网络资源， 本步骤申请建立 EPS承载并在原 MME与目标
MME之间进行承载切换的过程可以放在步骤 706 CS位置更新响应消息后 面。 若 CS位置更新失败， 就不执行建立 EPS承载及承载切换过程的过程。
步骤 704, 对于 MM上下文中有 VLR联盟信息， VLR联盟信息需要根 据新的 LA信息更新。 目标 MME向 VLR发起位置更新请求，携带新的 LAI , IMSI, MME的 IP地址，位置更新类型。 位置更新类型指示这是一个正常的 位置更新过程。
步骤 705, VLR执行 CS域的位置更新过程。 因某种原因 CS 域位置更 新失败， 如无用户数据、 区域受限、 签约受限等因素， 可造成 CS位置更新 失败。
步骤 706 , VLR向 MME返回位置更新失败消息。
步骤 707, 目标 MME收到 CS域位置更新失败消息后， 判断 UE的属性 是否是语音中心属性， 若 UE是语音中心属性， 就拒绝 UE的 TA/LA位置更 新请求。
步骤 708, MME发送位置更新拒绝消息给 UE, 拒绝 UE的 TA/LA位置 更新请求。 位置更新拒绝请求中进一步可以携带拒绝的原因： 更新的 EPS无线网络 不支持语音业务。
更进一步， 位置更新拒绝请求消息中可以携带 MME上静态配置的其它 支持语音业务的无线网络的地址列表， 并下发给 UE。 UE可以根据支持语音 业务的无线网络地址发起位置更新请求。
步骤 709, UE尝试向其它支持语音业务的无线网络发起位置更新请求。 因位置移动导致 UE在原 MME进行注销后， UE可直接向其它无线网络 发起附着请求。 若拒绝消息中没有携带无线网络的地址列表， UE可直接向 2G/3G无线网络发起 CS附着。
本发明为解决语音中心属性的 UE在发起联合注册 /联合位置更新失败的 问题， 优化网络资源配置， 缩短 UE附着到具有语音业务能力的无线网络的 时间， 本发明中 EPS网络可以判断 UE是否是语音中心属性， 当联合注册或 联合位置更新失败时，若 UE是语音中心属性，就直接拒绝 UE发起的 EPS/CS 联合注册请求或 TA/LA联合位置更新请求， 告知 UE现有无线网络不支持语 音业务， UE可直接向其它支持语音业务的无线网络发起业务请求。 综上所述， 利用本发明， 实现了用户在 EPS网络 /CS网络实现语音业务 的目的， 增强了用户的语音体验， 提高了用户的满意度。
尽管为示例目的， 已经公开了本发明的优选实施例， 本领域的技术人员 将意识到各种改进、 增加和取代也是可能的， 因此， 本发明的范围应当不限 于上述实施例。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性
通过本发明， 当 UE发起的联合注册或联合位置更新失败后， EPS 网络 不需要再为 UE建立新的 EPS承载， UE也不需要主动发起 EPS注销， 而直 接可以尝试附着到支持语音业务的无线网络。 大大节省了网络的宝贵资源， 也极大提高了 UE连接到支持语音业务的无线网络的速度， 一定程度上提高 了用户进行语音业务的用户体验。

Claims

权 利 要 求 书
1、 一种网络管理电路交换语音回落的方法， 包括：
语音中心属性的用户设备 ( UE )在演进的分组域系统（EPS ) 网络中发 起 EPS网络和电路交换（CS ) 网络的联合注册或联合位置更新的请求后， 若 所述 EPS网络向 CS网络发起的位置更新失败， 且所述 EPS网络不支持互联 网协议多媒体子系统语音业务，所述 EPS网络判断所述 UE为语音中心属性， 拒绝所述 UE的请求。
2、 如权利要求 1所述的方法， 该方法还包括：
所述 UE在 EPS网络中发起 EPS网络和 CS网络的联合注册或联合位置 更新的请求后， 所述 EPS网络先尝试向 CS网络发起位置更新， 若位置更新 成功， 再建立 EPS承载。
3、 如权利要求 1所述的方法， 其中，
所述 EPS网络判断所述 UE为语音中心属性的步骤包括：
所述 EPS网络根据所述 UE在 EPS网络中发起联合注册或联合位置更新 的请求时携带的属性参数， 判断所述 UE为语音中心属性；
或者， 所述 EPS网络根据所述 UE的签约数据中的属性参数， 判断所述 UE为语音中心属性。
4、 如权利要求 1所述的方法， 所述方法还包括：
所述 EPS网络在拒绝所述 UE的请求的消息中， 携带支持语音业务的无 线网络地址列表；
所述 UE根据接收到的所述支持语音业务的无线网络地址列表， 尝试附 着到其它支持语音业务的无线网络。
5、 如权利要求 1所述的方法， 所述方法还包括：
若所述 EPS网络拒绝所述 UE的请求的消息中， 未携带支持语音业务的 无线网络地址列表， 所述 UE直接向 2G或 3G无线网络发起 CS附着。
6、 如权利要求 1所述的方法， 上述方法还包括：
所述 EPS网络在拒绝所述 UE的请求的消息中携带拒绝的原因， 告知所 述 UE无线网络不支持语音业务。
7、 一种网络管理电路交换语音回落的系统， 包括用户设备（UE )和演 进的分组域系统（ EPS ) 网络，
所述 UE为语音中心属性，其设置为：在 EPS网络中发起 EPS网络和 CS 网络的联合注册或联合位置更新的请求；
所述 EPS网络不支持互联网协议多媒体子系统语音业务， 其设置为： 接 收到所述 UE发起联合注册或联合位置更新的请求后，若向 CS网络发起的位 置更新失败， 且判断所述 UE为语音中心属性， 则拒绝所述 UE的请求。
8、 如权利要求 7所述的系统， 其中，
所述 EPS网络还设置为：接收到所述联合注册或联合位置更新的请求后， 先尝试向 CS网络发起位置更新， 若位置更新成功， 再建立 EPS承载。
9、 如权利要求 7所述的系统， 其中，
所述 EPS网络还设置为： 根据所述 UE在 EPS网络中发起联合注册或联 合位置更新的请求时携带的属性参数或者根据所述 UE的签约数据中的属性 参数， 判断所述 UE为语音中心属性。
10、 如权利要求 7所述的系统， 其中，
所述 EPS网络还设置为： 在拒绝所述 UE的请求的消息中， 携带支持语 音业务的无线网络地址列表；
所述 UE还设置为： 根据接收到的所述支持语音业务的无线网络地址列 表， 选择接入其它支持语音业务的无线网络。
11、 一种演进的分组域系统（EPS ) , 所述 EPS不支持互联网协议多媒 体子系统语音业务， 该 EPS设置为：
接收到用户设备（UE )发起的联合注册或联合位置更新的请求后， 若向
CS网络发起的位置更新失败， 且判断所述 UE为语音中心属性， 则拒绝所述 UE的请求。
12、如权利要求 11所述的 EPS, 所述 EPS网络还设置为： 接收到所述联 合注册或联合位置更新的请求后， 先尝试向 CS 网络发起位置更新， 若位置 更新成功， 再建立 EPS承载。
13、 如权利要求 11所述的系统， 所述 EPS网络还设置为： 根据所述 UE 在 EPS网络中发起联合注册或联合位置更新的请求时携带的属性参数或者根 据所述 UE的签约数据中的属性参数， 判断所述 UE为语音中心属性。
14、 如权利要求 11所述的系统， 所述 EPS 网络还设置为： 在拒绝所述 UE的请求的消息中， 携带支持语音业务的无线网络地址列表。
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