WO2011023091A1 - Procédé et système de gestion du repli vers une transmission vocale à commutation de circuits dans un réseau - Google Patents

Procédé et système de gestion du repli vers une transmission vocale à commutation de circuits dans un réseau 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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Prior art keywords
network
eps
location update
voice
request
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PCT/CN2010/076259
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English (en)
Chinese (zh)
Inventor
谢宝国
李志军
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中兴通讯股份有限公司
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Publication of WO2011023091A1 publication Critical patent/WO2011023091A1/fr

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

Abstract

Procédé et système de gestion du repli vers une transmission vocale à commutation de circuits (Circuit Switched, CS) dans un réseau. Le procédé comporte les étapes suivantes : après qu’un équipement d’utilisateur (UE) présentant un attribut centré sur la voix a lancé une demande d’enregistrement ou de mise à jour de position, dans un contexte d’entreprise, d’un réseau de type système évolué par paquets (Evolved Packet System, EPS) et d’un réseau CS au sein du réseau EPS, si la mise à jour de position amorcée du réseau EPS vers le réseau CS échoue, et si le réseau EPS ne prend pas en charge le service vocal du sous-système de réseau central multimédia sous protocole Internet (IMS), le réseau EPS juge que l’UE présente l’attribut centré sur la voix, et rejette la demande de l’UE. Le procédé économise des ressources réseau et améliore la vitesse à laquelle l’UE se connecte au réseau sans fil prenant en charge le service vocal.
PCT/CN2010/076259 2009-08-28 2010-08-23 Procédé et système de gestion du repli vers une transmission vocale à commutation de circuits dans un réseau WO2011023091A1 (fr)

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CN200910168102.3 2009-08-28
CN2009101681023A CN101998357A (zh) 2009-08-28 2009-08-28 一种网络管理电路交换语音回落的方法和系统

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WO2011023091A1 true WO2011023091A1 (fr) 2011-03-03

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EP2819441B1 (fr) 2012-02-22 2020-11-25 LG Electronics Inc. Procédé et dispositif de prise en charge de service vocal dans un système de communication sans fil
EP3509387B1 (fr) * 2012-03-08 2021-07-28 Samsung Electronics Co., Ltd. Procédé de commande de services dans un système de communication sans fil
KR20130111157A (ko) 2012-03-29 2013-10-10 삼성전자주식회사 무선 통신 시스템의 혼잡 관리를 위한 방법 및 장치
KR102024815B1 (ko) 2012-03-19 2019-09-24 삼성전자 주식회사 로밍 시스템에서 메시지 송수신 방법 및 장치
KR20150014834A (ko) * 2013-07-30 2015-02-09 삼성전자주식회사 특정 서비스를 지속적으로 제공하는 방법 및 장치
CN107113864B (zh) * 2014-12-30 2020-02-14 华为技术有限公司 一种联合注册方法和装置
CN105873148B (zh) * 2015-01-21 2019-10-29 中国移动通信集团广东有限公司 一种网络切换的方法及装置
CN116506939A (zh) * 2020-09-21 2023-07-28 深圳市锐尔觅移动通信有限公司 网络注册方法、网络注册装置、存储介质与终端设备
CN114143870A (zh) * 2021-11-24 2022-03-04 惠州Tcl移动通信有限公司 一种5g独立组网终端注册方法、系统、终端及存储介质

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