WO2010003374A1 - 一种关联关系更新的实现方法及相应终端 - Google Patents

一种关联关系更新的实现方法及相应终端 Download PDF

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Publication number
WO2010003374A1
WO2010003374A1 PCT/CN2009/072679 CN2009072679W WO2010003374A1 WO 2010003374 A1 WO2010003374 A1 WO 2010003374A1 CN 2009072679 W CN2009072679 W CN 2009072679W WO 2010003374 A1 WO2010003374 A1 WO 2010003374A1
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WO
WIPO (PCT)
Prior art keywords
update
terminal
eps network
network
vlr
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Application number
PCT/CN2009/072679
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English (en)
French (fr)
Inventor
胡英
朱进国
宗在峰
Original Assignee
中兴通讯股份有限公司
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
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP09793849.2A priority Critical patent/EP2291014B1/en
Priority to ES09793849.2T priority patent/ES2439010T3/es
Priority to US13/002,759 priority patent/US8718653B2/en
Publication of WO2010003374A1 publication Critical patent/WO2010003374A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W60/00Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/005Multiple registrations, e.g. multihoming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08Mobility data transfer
    • H04W8/12Mobility data transfer between location registers or mobility servers

Definitions

  • the present invention relates to the field of communications, and in particular, to an implementation method of association update and a corresponding terminal.
  • FIG. 1 is a block diagram of the above system, in which only some of the entities associated with the present invention are shown. The entities in Figure 1 are described as follows:
  • MS Mobile Station
  • UE User Equipment
  • the MS/UE uses the UE representative, also called the terminal.
  • a terminal having the capability to access two types of wireless networks is called a dual mode terminal, and a terminal having the capability of accessing multiple wireless networks is called a multimode terminal.
  • the UE is a dual-mode terminal or multi-mode capable of accessing Global System for Mobile Communication (GSM)/Universal Mobile Telecommunication System (UMTS) and EPS networks. terminal.
  • GSM Global System for Mobile Communication
  • UMTS Universal Mobile Telecommunication System
  • E-UTRAN 102 an evolved radio access network, can provide higher uplink and downlink rates, lower transmission delays, and more reliable wireless transmission.
  • the network element contained in E-UTRAN is an evolved node (Evolved NodeB, referred to as eNodeB), provides radio resources for terminal access.
  • eNodeB evolved NodeB
  • the service gateway is a user plane entity responsible for user plane data routing processing.
  • the packet data network gateway is responsible for the gateway function of the UE accessing the Packet Data Network (PDN).
  • the P-GW and the S-GW may be located in the same physical entity, as shown in Figure 1, or may be located in different physical entities.
  • a Mobility Management Entity (MME) 104 is a control plane entity that temporarily stores user data and is responsible for managing and storing UE contexts (eg, UE/user identity, mobility management state, user security parameters, etc.). ), assigning a temporary identifier to the user, and is responsible for authenticating the user when the UE is camped on the tracking area or the network.
  • UE contexts eg, UE/user identity, mobility management state, user security parameters, etc.
  • IP Multimedia Subsystem is an IP-based network architecture proposed by 3GPP. It builds an open and flexible business environment, supports multimedia applications, and Users provide rich multimedia services.
  • IMS is an IP-based telecommunications network architecture. It has nothing to do with access technology.
  • EPS Packet Radio Service
  • GPRS General Packet Radio Service
  • wireless LAN it can also be GSM.
  • Mobile cellular networks such as UMTS provide services.
  • GERAN/UTRAN 105 is a wireless access network for traditional GSM/UMTS networks.
  • the Mobile Switching Center (MSC)/Visitor Location Register (VLR) 106 is a logically separated unit. When the network is actually deployed, the two are usually combined into one physical node.
  • the MSC/VLR may also be a new functional entity MSC Server after the 3GPP R4 (Release 4) phase, which is uniformly represented by the MSC/VLR in the present invention.
  • the GPRS Service Support Node (SGSN) 108 is a control network element of the GPRS network. The main function is to record the location information of the UE, and is in the UE and the GPRS Supporting Node (GGSN). The transmission and reception of mobile packet data is completed.
  • SGSN GPRS Service Support Node
  • GGSN GPRS Supporting Node
  • the MSC/VLR and GMSC in FIG. 1 belong to The CS domain network element allows users to make voice calls and other services with users in the local network or other networks (for example, fixed telephone networks and other mobile networks) through the CS domain.
  • the user's IP service is provided through a Packet Switching (PS) domain.
  • PS Packet Switching
  • the SGSN belongs to the PS domain network element.
  • the user accesses the packet data network through the PS domain.
  • the carrier IP network in FIG. 1 is a packet data network.
  • the UE can perform CS and PS update attachment separately, and access to the CS and PS domains respectively.
  • the UE sends a Location Area Update (LAU) and a Routing Area Update (RAU) request message to the GERAN/UTRAN (GERAN or UTRAN), respectively, when the UE performs the CS and PS update attachment.
  • LAU Location Area Update
  • RAU Routing Area Update
  • the GERAN/UTRAN receives the LAU request message, and sends the LAU request message to the MSC/VLR through the A/IU-CS interface.
  • the MSC/VLR receives the LAU request message and performs the update process of the CS domain.
  • the GERAN/UTRAN receives the RAU request message, and sends the RAU request message to the SGSN through the Gb/IU-PS interface.
  • the SGSN receives the RAU request message and performs the update process of the PS domain.
  • the manner in which the CS domain and the PS domain are updated separately requires occupying radio resources and performing signaling exchange.
  • a Gs interface is introduced between the MSC/VLR and the SGSN.
  • the Gs interface completes the establishment of the Gs association relationship between the MSC/VLR and the SGSN (ie, the VLR number is saved in the SGSN, and the SGSN number is saved in the VLR).
  • the MSC/VLR pages the UE of the called user through the PS domain. .
  • the Gs association is established through the joint routing area/location area update.
  • the joint routing area/location area update means that when the UE that is attached to the GSM/UMTS network CS and PS domain simultaneously performs the routing area update in the PS domain, the UE carries an identifier in the routing area update message, and the SGSN performs the routing area update. If it is judged that the network supports the Gs interface, the SGSN sends a location update message to the MSC/VLR to trigger the CS location update process, so that a CS location area update process is included in the PS domain routing area update process, and the joint routing area/location area update is included.
  • a Gs association relationship is established between the end of the SGSN and the VLR.
  • the MSC/VLR When the MSC/VLR receives the location area update request message from the A/IU-CS interface, the Gs association information will be deleted, and the location area information of the CS domain is saved in the MSC/VLR.
  • the MSC/VLR implements paging of the CS service through the SGSN. For example, the user to which the UE belongs is called as the called user by the user of the network or other network.
  • the MSC/VLR sends a CS paging request message to the SGSN through the Gs interface.
  • the SGSN After receiving the CS paging request message, the SGSN initiates a CS paging procedure to deliver the CS service page to the UE.
  • the UE receives the paging message of the CS service, accesses from the CS domain of the GSM/UMTS network, and sends a CS paging response message to the MSC/VLR through the GERAN/UTRAN.
  • the call setup process After receiving the CS paging response message, the call setup process begins between the MSC/VLR and the UE. After the call is established, the user to which the UE belongs can start talking with the user who initiated the call.
  • the UE supports the joint routing area/location area update is optional. According to the UE's ability to support both the CS domain and the PS domain, the UE is classified into three types: A, B, and C. Only Class A and Class B terminals support joint routing area/location area updates. Whether the SGSN and the MSC/VLR support the Gs interface is also optional. Some MSC/VLR and SGSN products do not support the Gs interface. Therefore, in some GSM/UMTS networks, there are both CS domain and PS domain, but no Gs interface is deployed. In this case, the UE performs update attachment in the CS domain and the PS domain respectively, and the CS service paging is performed through the A/IU-CS interface.
  • the MSC/VLR performs the terminating call, it is judged that if the UE is performing the CS service on the A/IU-CS interface, the MSC/VLR does not need to page the UE and directly exists through the A/IU-CS interface.
  • the signaling connection interacts with the UE. Otherwise, it indicates that there is no signaling connection between the MSC/VLR and the UE, and the MSC/VLR needs to page the UE.
  • the MSC/VLR performs paging of the CS service through the Gs interface; in the absence of the Gs association, the MSC/VLR performs paging of the CS service through the A/IU-CS interface.
  • the basic voice service of the user and the supplementary service based on the voice service are controlled by the IMS.
  • the EPS system 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 that have been covered by the GSM/UMTS network to provide users with high-speed IP data services and no IMS deployment.
  • the voice call service is expected. And it can only be provided through the CS domain of the GSM/UMTS network that has been fully covered.
  • the UE accesses the EPS network, because it is a single access, the UE is not in the GSM/UMTS network and cannot receive through the GSM/UMTS network.
  • the CS service pages and initiates the CS service, so that the user cannot perform CS services such as voice calls and short messages.
  • 3GPP established the CS Fallback (CSFB) topic to study solutions.
  • the existing CSFB solution is: Introducing an SGs interface between the MME and the MSC/VLR, and the SGs are extended based on the Gs interface.
  • the UE accesses the EPS network, the UE performs CSFB attachment or Joint Tracking Area Update (TAU) and LAU, and establishes an SGs association relationship between the MME and the MSC/VLR (save the MSC/VLR number or address in the MME) Information, the MME number or address information is stored in the MSC/VLR). Subsequently, when the UE moves in the EPS network, the latest location information of the UE is updated to the MME.
  • TAU Joint Tracking Area Update
  • the MSC/VLR receives the location area update request message from the A/IU-CS interface, the SGs association information will be deleted, and the location area information of the CS domain is saved in the MSC/VLR.
  • a CS service such as a voice termination call
  • the MSC/VLR receives the call, and sends a CS paging message to the MME through the SGs interface, and after receiving the CS paging message, the MME receives the CS paging message.
  • the CS page is sent to the UE through the E-UTRAN, and the paging circuit domain fallback is started after paging to the UE.
  • the circuit domain is backward.
  • the UE accesses from the GSM/UMTS CS domain, and sends a CS paging response message to the MSC/VLR. After receiving the response message, the MSC/VLR starts the call setup and the call process.
  • the MSC/VLR can always pass the SGs, Gs or A/IU-CS information stored in the VLR when performing CS services. Paging to the UE.
  • the MSC/VLR and the MME support the SGs interface to support the CSFB function, while the SGSN and the MSC/VLR do not support the Gs interface and/or the terminal does not support the joint routing area and the location area update, and the ISR is activated.
  • the MSC/VLR cannot page the UE in the scenario shown in FIG. 2 when performing the CS service.
  • the ISR is a mechanism for limiting the signaling that the UE brings in idle mode because of cell reselection between radio access technologies.
  • the UE When the UE is in the idle mode in the dual coverage area of the GSM/UMTS network and the EPS network, the UE may be in the event that the mobile or wireless signal strength changes or the like. Frequent handover between GSM/UMTS and EPS access modes, because of the need to continuously perform routing area update (the process of UE updating location in GSM/UMTS network PS domain) and tracking area update (the process of UE updating location in EPS network) Bring a lot of signaling interactions.
  • routing area update the process of UE updating location in GSM/UMTS network PS domain
  • tracking area update the process of UE updating location in EPS network
  • the main idea of the ISR solution in the 3GPP is that when both the UE and the network support the ISR function, both the SGSN and the MME save the user context information, and the UE also stores the information in the UE.
  • the registration information of the two networks so that the subsequent UE does not perform the TAU and RAU procedures when switching between networks, that is, when the UE moves between the GSM/UMTS and EPS networks, if the routing area of the UE (Location information of the PS domain UE of the GSM/UMTS network) and the tracking area list (location information of the EPS network UE) have been registered, and the UE does not initiate the routing area update and the tracking area update, so that the UE does not establish a connection with the network.
  • the network does not know whether the UE is currently in the EPS network or the GSM/UMTS network.
  • ISR activation is the registration information and ISR activation flag of the two networks stored in the EPS and GSM/UMTS PS in the case where both the UE and the network support the ISR function.
  • the MME and the SGSN simultaneously store the user information and the ISR activation flag. .
  • the ISR is not activated, that is, only one access registration information of the EPS or GSM/UMTS PS is recorded in the UE, and only the MME or the SGSN retains the user information.
  • FIG. 2 is a schematic diagram of a problem existing in the MSC/VLR for paging a CS service.
  • the SGs interface is supported between the MSC/VLR and the MME.
  • the Gs interface is not supported between the SGSN and the MSC/VLR.
  • the UE and the network support the ISR, and the UE activates the ISR.
  • the UE accesses the EPS network and performs CSFB attachment or association.
  • the CSFB attaching is that the UE carries the CSFB indication information in the attach request message sent to the EPS.
  • the MME After receiving the attach request message, the MME performs an attach procedure of the EPS network, and the MME sends a location update request message to the MSC/VLR to complete the UE in the CS domain. Update process.
  • the MME generates a tracking area list according to the current Tracking Area Identity (TAI) information of the user, and brings the tracking area list to the UE in the attach accept message.
  • TAI Tracking Area Identity
  • the UE After the CSFB attach process is completed, the UE is already registered in the EPS network and the GSM/UMTS CS domain, the MME information is saved in the VLR, the MSC/VLR information is saved in the MME, and the SGs association is established between the MSC/VLR and the MME.
  • the joint TAU/LAU process is similar to the above process, here Not #zhang detailed instructions.
  • the UE performs cell reselection from the GSM/UMTS network because of signal quality and the like, because the Gs interface is not supported.
  • the joint update cannot be performed, and the UE performs RAU and LAU respectively.
  • the SGSN receives the RAU message from the Gb/IU-PS interface
  • the MSC/VLR receives the LAU message from the A/IU-CS interface.
  • the SGSN, the MME, and the UE both support the ISR function, and the ISR is activated.
  • the MME continues to save data such as the user context.
  • the SGSN carries the ISR activation information to the UE in the routing area update accept message, and the UE receives the message to identify itself. Both the EPS network and the GSM/UMTS network PS domain are registered. When the routing area update is completed, the ISR is activated, and the UE is already registered in the GSM/UMTS network PS domain and EPS network. When the MSC/VLR receives the LAU message from the A/IU-CS interface, the SGs association is deleted, and only the location information carried by the location update is saved in the MSC/VLR.
  • the UE does not initiate the TAU process as long as the tracking area currently in the UE is within the range of the registered tracking area list, so that there is no SGs association information in the MSC/VLR. . If the user to which the UE belongs has a call and the user is the called user, and the MSC/VLR needs to page the UE, since there is no SGs association information in the MSC/VLR, the MSC/VLR will only pass the A/IU-CS interface.
  • the GSM/UMTS network pages the UE without initiating CS paging in the EPS network through the SGs interface.
  • the technical problem to be solved by the present invention is to provide an implementation method for updating an association relationship, so that the association relationship in the MSC/VLR can be updated in time, so that the MSC/VLR can always page to the UE during the terminating call.
  • the present invention provides an implementation method for updating an association relationship, including:
  • the terminal passes the global mobile communication system or the universal mobile communication system radio access network GERAN/
  • the UTRAN interacts with the mobile switching center/visit location register MSC/VLR for location update
  • the terminal sets the EPS.
  • the network needs to carry out the joint update flag information;
  • the terminal moves to the tracking area that has been registered in the EPS network, it is determined whether the flag information of the EPS network that needs to be jointly updated is set, and if yes, the terminal initiates a joint tracking area and location to the mobility management entity MME.
  • the MSC/VLR receives the location update request sent by the MME, the MSC/VLR updates the association relationship information stored therein, and reestablishes the association relationship with the MME.
  • the terminal sets the flag information that the EPS network needs to perform joint update when the location update request message is sent or when the location update accept message is received.
  • the terminal When the terminal sets the flag information of the EPS network to be jointly updated, it is implemented by setting one or more newly added flags; or by setting the internal update status of the terminal to be updated in the EPS network, the terminal is in the A joint update is initiated when moving back to the EPS network for updates.
  • the terminal, the GSM/UMTS, and the EPS network support the idle signaling mode, that is, the ISR function, and the ISR is activated;
  • the Gs interface is not supported between the MSC/VLR and the GPRS service support node SGSN, and/or the terminal does not support joint routing area and location area update.
  • the terminal Before the terminal performs the location update, after the EPS network completes the circuit domain fallback attachment or the joint tracking area and the location area update, the terminal is set to be registered and updated in the EPS network, and saves the tracking area list information generated by the MME. ;
  • the location update is performed by interacting with the MSC/VLR through GERAN/UTRAN.
  • the foregoing implementation method may also have the following features:
  • the terminal Before the terminal performs the location update, the terminal completes the circuit domain fallback attachment or the joint tracking area and the location area update in the EPS network;
  • the GERAN/UTRAN interacts with the MSC/VLR to perform the Location update.
  • the terminal moves to the EPS network, it is determined whether the flag information of the EPS network that needs to be jointly updated is set, and if yes, the terminal initiates a joint tracking area and a location area update to the mobility management entity MME; otherwise, The terminal then determines whether it is necessary to initiate a joint tracking area and a location area update according to other conditions set; or
  • the terminal moves to the EPS network, it is first determined whether the current tracking area is registered. If it is already registered, it is determined whether the flag information of the EPS network needs to be jointly updated, and if yes, the terminal moves to the mobility.
  • the management entity MME initiates a joint tracking area and a location area update.
  • the terminal that can be updated by the present invention includes a location update module, a joint update module, a circuit domain fallback module, and an idle mode signaling ISR module, and the ISR module is activated, wherein the terminal further includes an association update control.
  • the relationship update control module further includes a flag setting determining unit, a flag information setting unit, and an update initiating determining unit, wherein: the flag setting determining unit is configured to perform, by the location update module, a global mobile communication system or a universal mobile
  • the communication system radio access network that is, GERAN/UTRAN
  • the mobile switching center/visit location register that is, the MSC/VLR
  • the network of the system that is, the EPS network
  • the flag information setting unit is notified;
  • the flag information setting unit is configured to, after receiving the notification of the flag setting determining unit, Need to set up EPS network Flag information for joint update;
  • the update initiation determining unit is configured to determine, when the terminal moves to a tracking area that is currently registered by the EPS network, whether to set flag information that the EPS network needs to perform joint update, and if yes, notify the
  • the joint update module initiates a joint tracking area to the mobility management entity, ie, the MME And location area updates.
  • the above terminal may also have the following features:
  • the flag information setting unit sets the flag information that the EPS network needs to perform joint update, which is implemented by setting one or more newly added flags, or by setting the internal update status of the terminal to be updated in the EPS network.
  • the above terminal may also have the following features:
  • the update initiation determining unit is configured to: when the terminal moves to the EPS network, determine whether the flag information of the EPS network that needs to be jointly updated is set, and if yes, the terminal initiates to the mobility management entity MME The joint tracking area and the location area are updated, otherwise, according to other conditions set, it is judged whether it is necessary to initiate the joint tracking area and the location area update; or
  • the update initiation determining unit is configured to determine whether the current tracking area is registered when the terminal moves to the EPS network, and if it is already registered, determine whether the flag information of the EPS network needs to be jointly updated is set. If yes, the terminal initiates a joint tracking area and a location area update to the mobility management entity MME.
  • the present invention updates the association relationship (or re-establishes the association relationship) by setting the flag information that the EPS needs to perform joint update when the location is updated.
  • the method of the invention not only solves the problem that the MSC/VLR may not page the UE when paging is introduced after the ISR function is introduced, but also realizes that the UE recovers from the GSM/UMTS network after completing the CS service, from the GSM/UMTS.
  • the network returns to the EPS network, it can accurately determine the need to update the association relationship, ensuring that the MSC/VLR can correctly perform circuit domain paging and paging to the UE under various conditions, and the implementation method is simple, which is beneficial to the CSFB function and the EPS network.
  • 1 is a schematic diagram of a network architecture of an application of the present invention
  • 2 is a schematic diagram of a scenario in which MSC/VLR paging is problematic when the SGs interface is supported in the case of network ISR activation and the Gs interface is not supported in the prior art
  • FIG. 3 is a schematic flow chart of an embodiment of the present invention.
  • FIG. 4 is another flow chart of applying the embodiment of the present invention to the network deployment scenario shown in FIG. 2.
  • a method for determining that a UE needs to initiate a joint TAU and a LAU is provided, which is used to initiate a joint update process when a UE moves from a GSM/UMTS network to an EPS network, to update association information, thereby achieving mobility.
  • the switching center/visit location register MSC/VLR can always correctly perform the purpose of circuit domain service paging for the user equipment.
  • FIG. 3 is a flowchart of an implementation method for updating an association relationship of an SGs in this embodiment. As shown in Figure 3, the process includes:
  • the terminal may set the flag information that the EPS network needs to perform joint update when sending the location update request message or receiving the location update accept message;
  • the method for setting the EPS network to perform the joint tracking area and the location area update may be: (1) setting the internal update status of the UE to be in the EPS The network needs to be updated, and the UE initiates a joint update when moving back to the EPS network for updating; (2) adding one or more flags (for example, one flag indicates that the ISR deactivation needs to be jointly updated, and the other flag indicates the reason, etc.) ), used to identify that the UE moves from the GSM/UMTS network to the EPS network requires joint update.
  • the terminal moves to the registered tracking area of the EPS network, it is determined whether the flag information of the EPS network needs to be jointly updated, and if yes, the terminal initiates a joint tracking area and a location area update to the MME, and the MSC/VLR receives the After the location update request message sent by the MME, the association relationship information saved therein is updated, and the association relationship with the MME is reestablished.
  • the terminal moves to the EPS network, it is determined whether the flag information of the EPS network needs to be jointly updated, and if yes, the terminal initiates a joint tracking area and a location area update to the MME, otherwise, According to other conditions that are set, such as whether the tracking area is registered, it is determined whether the joint tracking area and the location area update need to be initiated. If a joint update needs to be initiated, the terminal initiates a joint tracking area and a location area update to the MME. Otherwise, the joint tracking area is not initiated. Location area update; or
  • the terminal moves to the EPS network, it is first determined whether the current tracking area is registered. If it is already registered, it is determined whether the flag information of the EPS network needs to be jointly updated. If yes, the terminal initiates a joint tracking area and a location area update to the MME.
  • the terminal that can implement the association update in this embodiment includes a location update module, a joint update module, a circuit domain fallback module, and an idle mode signaling ISR module, and the ISR module is activated, and further includes an association update.
  • a control module, the association update control module further comprising a flag setting determining unit, a flag information setting unit, and an update initiating determining unit: the flag setting determining unit, configured to, in the location update module, a global mobile communication system or a universal mobile communication
  • the system radio access network that is, the GERAN/UTRAN and the mobile switching center/visit location register, that is, the MSC/VLR
  • the joint update module and the circuit domain fallback module obtain information to determine whether the terminal is in an evolved group.
  • the network of the domain system that is, the EPS network, is subjected to joint update or circuit domain fallback attachment, and if so, the flag information setting unit is notified.
  • the flag information setting unit is configured to: after receiving the notification of the flag setting determining unit, set flag information that the EPS network needs to perform joint update; specifically, by setting one or more newly added flags. Implementation, or by setting the internal update status of the terminal to be required to be updated in the EPS network.
  • the update initiation determining unit is configured to: when the terminal moves to the tracking area that has been registered in the EPS network, determine whether the flag information of the EPS network that needs to be jointly updated is set, and if yes, enable the terminal A joint tracking area and a location area update are initiated to the mobility management entity, the MME.
  • the update initiation judging unit For the specific judgment method used by the update initiation judging unit, refer to the description of 304 in the method flow description. Bright.
  • the UE first performs CSFB attach or joint TAU and LAU in the EPS network.
  • the UE sets the EPS network to be registered and updated, and saves the tracking area list information generated by the MME. I know that the joint update is successful.
  • the MSC/VLR performs CS paging through the SGs interface according to the SGs association information when paging is required;
  • the UE moves from the EPS network to the GSM/UMTS network.
  • the UE sends a LAU request message to the MSC/VLR or receives a LAU accept message from the MSC/VLR, setting the mobile to the EPS network needs to be combined.
  • Updated logo information When the UE is in the GSM/UMTS network, the MSC/VLR can page to the UE through the A/IU-CS interface when paging is required;
  • the UE determines that the joint TAU and the LAU need to be performed according to the flag information that needs to be jointly updated, and the UE sends a joint update request to the MME, and the MME sends a location update request to the MSC/VLR.
  • the MSC/VLR establishes an SGs association after receiving a location update request from the MME;
  • the MSC/VLR can send the paging to the UE through the SGs interface according to the SGs association.
  • FIG. 4 is another flow of the network deployment scenario shown in Figure 2. Different from the flow shown in Figure 2, the UE accesses the GSM/UMTS network first, and the ISR function is activated when the EPS network is accessed.
  • the process of the present invention under the flow shown in Figure 4 is as follows:
  • the UE In the first step shown in FIG. 4, the UE first performs RAU and LAU respectively in the GSM/UMTS network. After the process ends, the UE sets the CS domain and the PS domain of the GSM/UMTS network to be separately registered; when the UE is in GSM /UMTS network, the MSC/VLR can page to the UE through the A/IU-CS interface when paging is required;
  • the UE moves from the GSM/UMTS network to the EPS network to perform joint TAU and LAU.
  • the UE settings are registered in the EPS network, and are saved.
  • the tracking area list information generated by the MME the UE knows that the joint update is successful, and because the terminal and the network support the ISR function, the ISR is activated, and the registration information of the UE in the PS domain of the GSM/UMTS network continues to be maintained.
  • the MSC/VLR performs CS paging through the SGs interface according to the SGs association information when paging is required;
  • the UE moves again from the EPS network to the GSM/UMTS network, and the UE may perform the LAU procedure.
  • the UE performs the LAU procedure
  • the UE when transmitting the LAU request message to the MSC/VLR or receiving the LAU accept message from the MSC/VLR, the UE sets the flag information for the joint update to be moved to the EPS network.
  • the process of setting the flag information of the joint update of the EPS network is not performed. In this case, since the LAU process is not performed, the association information in the MSC/VLR is not deleted, and subsequently there is no problem when the UE accesses the EPS network and the MSC/VLR performs CS paging;
  • the UE needs to perform joint update flag information according to the EPS network, and determines whether the joint TAU and LAU need to be performed.
  • the UE sends a joint update request to the MME, and the MSC/VLR establishes an SGs association after receiving the location update request from the MME.
  • the MSC/VLR needs to perform the CS service paging, the MSC/VLR associates with the SGs.
  • the CS page is sent to the UE through the SGs interface.
  • the problem that the MSC/VLR performs the CS service paging in the network scenario shown in FIG. 2 can be solved by using the present invention.
  • the present invention can also be applied to another scenario of CSFB.
  • the UE After performing CSFB attachment or combining TAU and LAU, the UE receives CS paging from the MSC/VLR and falls back to the CS domain of the GSM/UMTS network.
  • the MSC/VLR receives the LAU request from the GERAN/UTRAN through the A/IU-CS interface.
  • the MSC/VLR deletes the SGs association.
  • the UE may also not need to perform a location update process or the location update is done by performing a joint RAU/LAU.
  • the UE When the UE ends the CS service in the GSM/UMTS network and returns to the EPS network, if the UE performs location update during the fallback process, and the location update is not the joint routing area and the location area update In the case of the joint TAU and LAU procedures, the SGs association needs to be updated, otherwise the joint TAU and LAU procedures are not necessary. There is no method in the prior art for the UE to know the need to perform joint TAU and LAU information.
  • the flag information of the EPS network in which the EPS network needs to be jointly updated is set. If the UE does not perform the LAU procedure, the process of setting the flag information of the joint update of the EPS network is not performed;
  • the UE determines whether a joint update process is required according to the flag information therein. If necessary, the UE initiates a joint TAU and LAU, and the MSC/VLR receives a location update request message from the MME, and establishes an association relationship with the MME.
  • the MSC/VLR when the MSC/VLR needs to perform the CS service paging, the MSC/VLR sends the paging to the UE through the SGs interface according to the SGs association information.
  • the method of the present invention not only solves the problem that the MSC/VLR may not page the UE when paging is introduced after the ISR function is introduced, but also realizes that the UE falls back to the UMTS/GSM network to complete the CS service.
  • the MSC/VLR After returning from the GSM/UMTS network to the EPS network, it can accurately determine whether the relationship needs to be updated (or re-established), ensuring that the MSC/VLR can correctly perform circuit domain paging and paging to the UE under various circumstances.
  • the implementation method is simple, which is beneficial to the CSFB function and the application of the EPS network.
  • the present invention updates the association relationship (or re-establishes the association relationship) by setting the flag information that the EPS needs to perform joint update when the location is updated.
  • the method of the present invention not only solves the problem that the MSC/VLR may not page the UE when paging is introduced after the ISR function is introduced, but also realizes that the UE recovers from the GSM/UMTS network after completing the CS service, from the GSM/UMTS.
  • the network returns to the EPS network, it can accurately determine the need to update the association relationship, ensuring that the MSC/VLR can correctly perform circuit domain paging and paging to the UE under various conditions, and the implementation method is simple, which is beneficial to the CSFB function and the EPS network.

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Description

一种关联关系更新的实现方法及相应终端
技术领域
本发明涉及通信领域, 并且特别地, 涉及一种关联关系更新的实现方法 和相应终端。
背景技术
目前, 第三代合作伙伴计戈' J ( 3rd Generation Partnership Project, 简称 3GPP ) 的标准化工作组正致力于研究分组交换核心网 ( Packet Switched Core Network, 简称 PS-CN )和通用移动通信系统无线接入网 (Universal Mobile Telecommunication System Terrestrial Radio Access Network, 简称 UTRAN )的 演进, 目的在于使得演进的 PS-CN可以提供更高的传输速率、 更短的传输延 时、 并支持演进的 UTRAN ( Evolved UTRAN, 简称 E-UTRAN ) 、 全球移动 通讯系统增强型数据速率全球移动通讯系统演进技术无线接入网 ( Global System for Mobile communications Enhanced Data Rate for GSM Evolution radio access network, 简称 GERAN ) 、 UTRAN、 无线局 i或网 ( Wireless Local Area Network, 简称 WLAN )及其它非 3GPP的接入网络之间的移动性管理。 演进 的移动通信系统被称为演进的分组域系统(Evolved Packet System,简称 EPS )。 图 1 为上述系统的构架图, 其中, 只示出了与本发明有关的部分实体。 图 1 中各实体说明如下:
移动台( Mobile Station, 简称 MS) /用户设备 ( User Equipment, 简称 UE ) 101, 在后续的说明中, MS/UE统一使用 UE代表, 也称为终端。 具有能接入 两种无线网络能力的终端称为双模终端, 具有能接入多种无线网络能力的终 端称为多模终端。 在后续的说明中, UE 是能够接入到全球移动通讯系统 ( Global System for Mobile Communication, 简称 GSM ) /通用移动通信系统 (Universal Mobile Telecommunication System, 简称 UMTS)和 EPS网络的双模 终端或者多模终端。
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。 E-UTRAN 中包含的网元是演进的节点 (Evolved NodeB, 简称 eNodeB), 为终端的接入提供无线资源。
服务网关( Serving Gateway, 简称 S-GW)和分组数据网网关( Packet Data Network Gateway, 简称 PDN GW或 P-GW ) 103 , 服务网关是一个用户面实 体, 负责用户面数据路由处理。 分组数据网网关负责 UE接入分组数据网 ( Packet Data Network , 简称 PDN )的网关功能。 P-GW和 S-GW可以设在同 一个物理实体中, 如图 1所示, 也可以设在不同的物理实体中。
移动性管理实体(Mobility Management Entity, 简称 MME ) 104, 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(例 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用户进行鉴权。
互联网协议 ( Internet Protocol, 简称 IP ) 多媒体子系统 ( IP Multimedia 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、 通用分组无线业务( General Packet Radio Service, 简称 GPRS )、 无线局域网 等分组接入网络提供业务外, 也可以为 GSM、 UMTS等移动蜂窝网络提供业 务。
GERAN/UTRAN 105 , 是传统 GSM/UMTS网络的无线接入网。
移动交换中心 (Mobile Switching Center, 简称 MSC ) /拜访位置寄存器 ( Visitor Location Register, 简称 VLR ) 106, 是两个逻辑分开的单元, 在实 际布网的时候通常将两者合设为一个物理节点。 该 MSC/VLR也可以是在 3GPP R4 ( Release 4 ) 阶段后的新功能实体 MSC Server, 在本发明中统一用 MSC/VLR代表。
关口移动交换中心( Gateway Mobile Switching Center, 简称 GMSC ) 107。 GPRS服务支持节点 (Serving GPRS Support Node, 简称 SGSN) 108, 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 GPRS网关 支持节点( Gateway GPRS Supporting Node, 简称 GGSN )之间完成移动分组 数据的发送和接收。 当 UE在 GSM/UMTS网络接入时, 用户的基本语音业务、短消息业务以 及基于语音业务的补充业务通过电路交换( Circuit Switching, 简称 CS )域提 供, 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(例如, 固定电话网、 其它移动网) 的用户进行语音呼叫 等业务。 用户的 IP业务通过分组交换( Packet Switching, 简称 PS )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 IP网络就是分组数据网。
在 GSM/UMTS网络, UE可以分别进行 CS和 PS更新附着, 分别接入到 CS和 PS域。当 UE分别进行 CS和 PS更新附着时, UE分别给 GERAN/UTRAN ( GERAN或 UTRAN )发送位置区更新 ( Location Area Update , 简称 LAU ) 和路由区更新( Routing Area Update , 简称 RAU )请求消息。 GERAN/UTRAN 接收到 LAU请求消息,通过 A/IU-CS接口将 LAU请求消息发送给 MSC/VLR , MSC/VLR 接收到 LAU 请求消息, 进行 CS 域的更新附着过程。 GERAN/UTRAN接收到 RAU请求消息 , 通过 Gb/IU-PS接口将 RAU请求消 息发送给 SGSN, SGSN接收到 RAU请求消息, 进行 PS域的更新附着过程。 CS域和 PS域分别进行更新的方式需要分别占用无线资源和进行信令交换。
为了节省移动性管理信令开销和无线资源占用, 在 GPRS中, MSC/VLR 和 SGSN之间引入 Gs接口。 Gs接口完成在 MSC/VLR和 SGSN之间建立 Gs 关联关系 (即, 在 SGSN保存 VLR号码, 在 VLR保存 SGSN号码) , 在建 立 Gs关联关系后 MSC/VLR通过 PS域寻呼被叫用户的 UE。
Gs 关联关系是通过联合路由区 /位置区更新建立的。 联合路由区 /位置区 更新,就是支持同时附着到 GSM/UMTS网络 CS和 PS域的 UE在 PS域进行 路由区更新时, UE在路由区更新消息中携带一个标识, SGSN在进行路由区 更新时, 如果判断网络支持 Gs接口, SGSN就向 MSC/VLR发送位置更新消 息触发 CS位置更新过程, 这样就在 PS域路由区更新过程中包含了一个 CS 位置区更新过程, 联合路由区 /位置区更新结束 SGSN和 VLR之间就建立了 Gs关联关系。
当 MSC/VLR从 A/IU-CS接口上接收到位置区更新请求消息时, Gs关联 关系信息将被删除, MSC/VLR中保存 CS域的位置区信息。 当 UE在 GSM/UMTS网络 CS域和 PS域已经附着并且建立 Gs关联关系 后, MSC/VLR通过 SGSN实现 CS业务的寻呼。 例如, UE所属的用户作为 被叫用户被本网络或者其它网络的用户呼叫,在进行终呼时, MSC/VLR通过 Gs接口给 SGSN发送 CS寻呼请求消息。 SGSN接收到 CS寻呼请求消息后发 起 CS寻呼过程,将 CS业务寻呼传递到 UE。 UE接收到 CS业务的寻呼消息, 从 GSM/UMTS网络 CS域接入, 通过 GERAN/UTRAN给 MSC/VLR发送一 个 CS寻呼响应消息。 接收到 CS寻呼响应消息后, MSC/VLR和 UE之间就 开始进行呼叫建立过程。呼叫建立完成后, UE所属的用户就可以开始与发起 呼叫的用户进行通话。
需要说明的是, UE是否支持联合路由区 /位置区更新是可选的, 根据 UE 同时支持 CS域和 PS域工作能力的不同将 UE分为 A、 B、 C三类终端, 只有 A类和 B类终端支持联合路由区 /位置区更新。 SGSN和 MSC/VLR是否支持 Gs接口也是可选的, 有些 MSC/VLR和 SGSN产品不支持 Gs接口, 所以在 有些 GSM/UMTS网络中同时有 CS域和 PS域,但是没有部署 Gs接口,这种 情况下 UE在 CS域和 PS域分别进行更新附着, CS业务寻呼通过 A /IU-CS 接口进行。
在 GSM/UMTS网络中, MSC/VLR进行终呼时,判断 UE如果在 A/IU-CS 接口正在进行 CS业务, MSC/VLR不需要寻呼 UE, 直接通过 A/IU-CS接口 已经存在的信令连接与 UE进行交互。 否则, 说明 MSC/VLR和 UE之间不存 在信令连接, MSC/VLR需要寻呼 UE。 在存在 Gs关联的情况下, MSC/VLR 通过 Gs接口进行 CS业务的寻呼; 在不存在 Gs关联的情况下, MSC/VLR通 过 A/IU-CS接口进行 CS业务的寻呼。
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系统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 GSM/UMTS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, 不部署 IMS, 此种场景下, 希望语音呼叫业务能够并且只能通 过已经全面覆盖的 GSM/UMTS网络的 CS域来提供,当 UE接入 EPS网络时, 因为是单接入, UE不在 GSM/UMTS网络, 无法通过 GSM/UMTS网络接收 CS业务寻呼和发起 CS业务, 这样用户就无法进行语音呼叫、 短消息等 CS 业务。为了在这种网络部署场景下实现 CS业务, 3GPP成立了电路域回落( CS Fallback, 简称 CSFB )课题来研究解决方案。
现有的 CSFB解决方案为: 在 MME和 MSC/VLR之间引入 SGs接口, SGs基于 Gs接口扩展。 当 UE接入 EPS网络时, UE进行 CSFB附着或者联 合跟踪区更新( Tracking Area Update,简称 TAU )和 LAU, MME和 MSC/VLR 之间建立 SGs关联关系 (在 MME中保存 MSC/VLR号码或者地址信息, 在 MSC/VLR中保存 MME号码或者地址信息)。 后续, 当 UE在 EPS网络中移 动时, UE的最新位置信息会更新到 MME,如果位置区或者 MME发生变化, MSC/VLR中保存的信息也会及时更新。 当 MSC/VLR从 A/IU-CS接口上接收到位置区更新请求消息时, SGs关 联关系信息将被删除, MSC/VLR中保存 CS域的位置区信息。 在进行 CS业务如语音终呼时, 如果被叫用户的 UE是在 EPS网络接入, MSC/VLR接收到呼叫, 通过 SGs接口向 MME发出 CS寻呼消息, MME接 收到 CS寻呼消息后,通过 E-UTRAN将 CS寻呼发送到 UE,寻呼到 UE后就 开始进行呼叫电路域回落。 电路域回落后 UE从 GSM/UMTS CS域接入, 给 MSC/VLR发送 CS寻呼应答消息, MSC/VLR接收到应答消息后开始呼叫建 立和通话过程。
在没有引入空闲模式下节约信令( Idle-mode Signaling Reduction , 简称 ISR )的情况下, 当进行 CS业务时, MSC/VLR总是可以通过 VLR中保存的 SGs、 Gs或者 A/IU-CS信息寻呼到 UE。 引入 ISR后, 在 MSC/VLR和 MME 支持 SGs接口以支持 CSFB功能,而 SGSN和 MSC/VLR之间不支持 Gs接口 和 /或终端不支持联合路由区和位置区更新,且激活 ISR的情况下, UE在 EPS 网络接入时,按照现有技术 MSC/VLR在进行 CS业务时在图 2所示的场景下 无法寻呼到 UE。 下面结合图 2来介绍 ISR相关概念和说明存在的问题。
ISR是一种用来限制 UE在空闲模式因为进行无线接入技术之间小区重 选而带来的信令的机制。 当 UE在 GSM/UMTS网络和 EPS网络双覆盖区域 处于空闲模式时, 因为移动或者无线信号强度发生变化等原因 UE可能会在 GSM/UMTS和 EPS接入方式之间频繁切换,从而因为需要不断进行路由区更 新 (UE在 GSM/UMTS网络 PS域更新位置的过程)和跟踪区更新 (UE在 EPS 网络更新位置的过程) 而带来大量信令交互。 为了减少上述信令交互过 程给网络带来的信令负荷, 3GPP中 ISR解决方案的主要思想就是当 UE和网 络都支持 ISR功能时, SGSN和 MME都保存用户上下文信息, UE中也保存 在这两个网络的注册信息,这样,后续 UE在网络之间切换时就不再进行 TAU 和 RAU过程,也就是说,后续当 UE在 GSM/UMTS和 EPS网络之间移动时, 如果 UE的路由区( GSM/UMTS网络 PS域 UE的位置信息)和跟踪区列表( EPS 网络 UE的位置信息)已经注册过, UE就不会发起路由区更新和跟踪区更新, 从而在 UE没有建立与网络的连接时, 网络不知道 UE当前处于 EPS网络还 是 GSM/UMTS网络。
ISR激活就是在 UE和网络都支持 ISR功能的情况下, UE中保存在 EPS 和 GSM/UMTS PS两个网络的注册信息和 ISR激活标志, MME和 SGSN同 时保存用户的信息和 ISR激活标志的情况。 ISR没有激活,就是在 UE中只记 录在 EPS或者 GSM/UMTS PS的一个接入注册信息, 只有 MME或者 SGSN 中保留用户信息的情况。
图 2为 MSC/VLR进行 CS业务寻呼时存在的问题的示意图。在图 2所示 网络部署场景下, 在 MSC/VLR和 MME之间支持 SGs接口, SGSN和 MSC/VLR之间不支持 Gs接口, UE和网络支持 ISR, 且 UE激活了 ISR。
在图 2所示第一步中, UE在 EPS网络接入, 进行 CSFB附着或者联合
TAU和 LAU过程。 CSFB附着是 UE在发给 EPS的附着请求消息中携带 CSFB 指示信息, MME接收到附着请求消息后, 进行 EPS网络的附着流程, 同时 MME给 MSC/VLR发送位置更新请求消息来完成 UE在 CS域的更新过程。 在该过程中, MME根据用户当前的跟踪区标识( Tracking Area Identity, 简称 TAI )等信息生成跟踪区列表并在附着接受消息中将跟踪区列表带给 UE, UE 接收到附着接受消息后, 保存跟踪区列表和设置 UE在 EPS网络中已经更新 的标志。 在 CSFB附着过程完成后, UE在 EPS网络和 GSM/UMTS CS域已 经注册, VLR中保存 MME信息 , MME中保存 MSC/VLR信息 , MSC/VLR 与 MME之间建立 SGs关联。 联合 TAU/LAU过程和上述过程类似, 在此就 不#丈详细说明。
在图 2所示第二步中, 当 UE从 EPS网络移动到 GSM/UMTS网络覆盖 范围时, 因为信号质量等原因, UE进行小区重选从 GSM/UMTS网络接入, 因为不支持 Gs接口, 不能进行联合更新, UE分别进行 RAU和 LAU。 如图 2所示, SGSN从 Gb/IU-PS接口上接收到 RAU消息, MSC/VLR从 A/IU-CS 接口上接收到 LAU消息。 当进行 RAU时, 因为 SGSN、 MME和 UE都支持 ISR功能, ISR激活, MME继续保存用户上下文等数据, SGSN在路由区更 新接受消息中携带 ISR激活信息给 UE, UE接收到该消息标识自己在 EPS网 络和 GSM/UMTS网络 PS域都是注册的。 当路由区更新完成后, ISR激活, UE在 GSM/UMTS网络 PS域和 EPS网络都已经注册。当 MSC/VLR从 A/IU-CS 接口上接收到 LAU消息, 会将 SGs关联删除, MSC/VLR中只保存本次位置 更新所携带的位置信息。
后续, 当 UE从 GSM/UMTS网络移动到 EPS网络时, 只要 UE当前所在 的跟踪区在已经注册的跟踪区列表范围内, UE就不会发起 TAU过程, 这样 MSC/VLR中没有 SGs关联关系信息。如果此时 UE所属的用户有一个呼叫并 且该用户是被叫用户, MSC/VLR需要寻呼 UE时,因为 MSC/VLR中没有 SGs 关联信息, MSC/VLR只会通过 A/IU-CS接口在 GSM/UMTS网络寻呼 UE , 而不会通过 SGs接口在 EPS网络中发起 CS寻呼, 但是, 因为 UE此时只在 EPS网络接入, 在 GSM/UMTS网络 CS域无法被寻呼到, 所以 MSC/VLR无 法寻呼到 UE, 也就是说, UE所属的用户在这种情况下无法接收到 CS呼叫。 目前尚未有解决上述问题的技术方案。 发明内容
本发明要解决的技术问题是提供一种关联关系更新的实现方法, 使得 MSC/VLR中的关联关系能够及时更新, 从而在终呼时, MSC/VLR总是可以 寻呼到 UE。
为了解决上述技术问题, 本发明提供了一种关联关系更新的实现方法, 包括:
终端通过全球移动通信系统或通用移动通信系统无线接入网 GERAN/ UTRAN与移动交换中心 /拜访位置寄存器 MSC/VLR交互进行位置更新时, 如所述终端已在演进的分组域系统的网络即 EPS网络进行过联合更新或电路 域回落附着, 则所述终端设置 EPS网络需要进行联合更新的标志信息;
所述终端移动到所述 EPS网络已注册的跟踪区时, 判断是否设置有所述 EPS 网络需要进行联合更新的标志信息, 如有, 所述终端向移动性管理实体 MME发起联合跟踪区和位置区更新, 所述 MSC/VLR接收到所述 MME发送 的位置更新请求后, 更新其中保存的关联关系信息, 重建与所述 MME之间 的关联关系。
进一步地, 上述实现方法还可具有以下特点:
所述终端是在发送位置更新请求消息时或者接收到位置更新接受消息时 设置所述 EPS网络需要进行联合更新的标志信息。
进一步地, 上述实现方法还可具有以下特点:
所述终端设置 EPS网络需要进行联合更新的标志信息时, 通过设置一个 或者多个新增的标志来实现; 或者通过设置所述终端内部更新状态为在 EPS 网络需要进行更新, 由所述终端在移回 EPS网络进行更新时发起联合更新。
进一步地, 上述实现方法还可具有以下特点:
所述终端、 GSM/UMTS和 EPS 网络均支持空闲模式下节约信令即 ISR 功能, ISR激活;
所述 MSC/VLR和所述 MME之间支持 SGs接口;
所述 MSC/VLR和所述 GPRS服务支持节点 SGSN之间不支持 Gs接口, 和 /或所述终端不支持联合路由区和位置区更新。
进一步地, 上述实现方法还可具有以下特点:
在所述终端进行所述位置更新之前, 所述终端在 EPS网络完成电路域回 落附着或者联合跟踪区和位置区更新后, 设置在 EPS网络已经注册和更新, 且保存 MME生成的跟踪区列表信息;
当所述终端从所述 EPS 网络移动到 GSM/UMTS 网络后, 通过 GERAN/UTRAN与所述 MSC/VLR交互进行所述位置更新。 进一步地, 上述实现方法还可具有以下特点:
在所述终端进行所述位置更新之前, 所述终端在 EPS网络完成电路域回 落附着或者联合跟踪区和位置区更新;
之后,所述终端从 MSC/VLR接收到电路域业务寻呼,回落到 GSM/UMTS 网络电路域进行业务且需要进行位置更新时,通过所述 GERAN/UTRAN与所 述 MSC/VLR交互进行所述位置更新。
进一步地, 上述实现方法还可具有以下特点:
所述终端移动到所述 EPS网络时,判断是否设置有所述 EPS网络需要进 行联合更新的标志信息, 如有, 所述终端向移动性管理实体 MME发起联合 跟踪区和位置区更新, 否则, 终端再根据设定的其它条件判断是否需要发起 联合跟踪区和位置区更新; 或者
所述终端移动到所述 EPS网络时, 先判断当前跟踪区是否已注册, 如果 已注册, 再判断是否设置有所述 EPS网络需要进行联合更新的标志信息, 如 有, 所述终端向移动性管理实体 MME发起联合跟踪区和位置区更新。
本发明提供的可实现关联关系更新的终端包括位置更新模块、 联合更新 模块、电路域回落模块和空闲模式下节约信令 ISR模块且该 ISR模块已激活, 其中所述终端还包括关联关系更新控制模块, 该关联关系更新控制模块进一 步包括标志设置判断单元、 标志信息设置单元和更新发起判断单元, 其中: 所述标志设置判断单元, 用于在所述位置更新模块通过全球移动通信系 统或通用移动通信系统无线接入网即 GERAN/UTRAN与移动交换中心 /拜访 位置寄存器即 MSC/VLR交互进行位置更新时, 从所述联合更新模块和电路 域回落模块获取信息判断终端是否已在演进的分组域系统的网络即 EPS网络 进行过联合更新或者电路域回落附着, 如是, 通知所述标志信息设置单元; 所述标志信息设置单元, 用于在收到所述标志设置判断单元的所述通知 后, 设置 EPS网络需要进行联合更新的标志信息;
所述更新发起判断单元, 用于在所述终端移动到所述 EPS网络当前已注 册的跟踪区时,判断是否设置有所述 EPS网络需要进行联合更新的标志信息, 如有, 则通知所述联合更新模块向移动性管理实体即 MME发起联合跟踪区 和位置区更新。
进一步地, 上述终端还可具有以下特点:
所述标志信息设置单元设置 EPS网络需要进行联合更新的标志信息, 是 通过设置一个或者多个新增的标志来实现, 或者通过设置所述终端内部更新 状态为在 EPS网络需要进行更新来实现。
进一步地, 上述终端还可具有以下特点:
所述更新发起判断单元, 用于在所述终端移动到所述 EPS网络时, 判断 是否设置有所述 EPS网络需要进行联合更新的标志信息, 如有, 所述终端向 移动性管理实体 MME发起联合跟踪区和位置区更新, 否则, 再根据设定的 其它条件判断是否需要发起联合跟踪区和位置区更新; 或者
所述更新发起判断单元, 用于所述终端移动到所述 EPS网络时, 先判断 当前跟踪区是否已注册, 如果已注册, 再判断是否设置有所述 EPS网络需要 进行联合更新的标志信息, 如有, 所述终端向移动性管理实体 MME发起联 合跟踪区和位置区更新。
本发明通过 UE在位置更新时设置 EPS需要进行联合更新的标志信息来 更新关联关系 (或者说重建关联关系) 。 利用本发明的方法, 不仅解决了引 入 ISR功能后, MSC/VLR进行寻呼时可能寻呼不到 UE的问题, 而且实现了 UE在回落到 GSM/UMTS网络完成 CS业务后, 从 GSM/UMTS网络返回到 EPS网络时能够准确判断需要更新关联关系,保证了在各种情况下 MSC/VLR 都能够正确地进行电路域寻呼和寻呼到 UE, 实现方法简单, 有利于 CSFB功 能以及 EPS网络的应用。 附图概述
此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中:
图 1是本发明应用的网络构架示意图; 图 2是现有技术中在网络 ISR激活的情况下支持 SGs接口且不支持 Gs 接口时 MSC/VLR寻呼存在问题的场景示意图;
图 3是根据本发明实施例的流程示意图;
图 4是本发明实施例应用到图 2所示网络部署场景下的另一个流程图。
本发明的较佳实施方式
下面结合附图对本发明的具体实施方式进行详细说明。
在本发明实施例中, 提供了一种 UE判断需要发起联合 TAU和 LAU的 方法, 用于当 UE从 GSM/UMTS网络移动到 EPS网络时发起联合更新过程, 来更新关联关系信息, 从而达到移动交换中心 /拜访位置寄存器 MSC/VLR总 是可以正确地对用户设备进行电路域业务寻呼的目的。
图 3是本实施例更新 SGs关联关系的实现方法的流程图。 如图 3所示, 该流程包括:
302: 终端通过 GERAN/UTRAN与 MSC/VLR交互进行位置更新时, 如 该终端已在 EPS网络进行过联合更新或电路域回落附着, 则设置 EPS网络需 要进行联合更新的标志信息;
在 302实施时, 终端可以在发送位置更新请求消息时或者接收到位置更 新接受消息时设置 EPS网络需要进行联合更新的标志信息;
在 302实施时, 终端实现设置 EPS网络需要进行联合跟踪区和位置区更 新(文中也简写为 "需要进行联合更新" )的标志信息的方法可以为: (一) 设置 UE内部更新状态为在 EPS网络需要进行更新, UE在移回 EPS网络进 行更新时发起联合更新; (二)新增一个或者多个标志 (比如, 一个标志表 示 ISR去激活需要进行联合更新, 另一个标志表示原因等实现方法) , 用来 标识 UE从 GSM/UMTS网络移动到 EPS网络需要进行联合更新。
304: 终端移动到 EPS网络已注册的跟踪区时,判断是否设置有所述 EPS 网络需要进行联合更新的标志信息, 如有, 终端向 MME发起联合跟踪区和 位置区更新, MSC/VLR接收到 MME发送的位置更新请求消息后, 更新其中 保存的关联关系信息, 重建与 MME之间的关联关系。 在具体实现上, 有以下两种选择: 终端移动到 EPS网络时,判断是否设置有 EPS网络需要进行联合更新的 标志信息, 如有, 终端向 MME发起联合跟踪区和位置区更新, 否则, 再根 据设定的其它条件如跟踪区是否注册判断是否需要发起联合跟踪区和位置区 更新, 如果需要发起联合更新, 则终端向 MME发起联合跟踪区和位置区更 新, 否则, 不发起联合跟踪区和位置区更新; 或者
终端移动到 EPS网络时, 先判断当前跟踪区是否已注册, 如果已注册, 再判断是否设置有 EPS 网络需要进行联合更新的标志信息, 如有, 终端向 MME发起联合跟踪区和位置区更新。
相应地, 本实施例可以实现关联关系更新的终端除包括位置更新模块、 联合更新模块、 电路域回落模块和空闲模式下节约信令 ISR模块且该 ISR模 块已激活, 此外还包括一关联关系更新控制模块, 该关联关系更新控制模块 进一步包括标志设置判断单元、 标志信息设置单元和更新发起判断单元: 所述标志设置判断单元, 用于在所述位置更新模块通过全球移动通信系 统或通用移动通信系统无线接入网即 GERAN/UTRAN与移动交换中心 /拜访 位置寄存器即 MSC/VLR交互进行位置更新时, 从所述联合更新模块和电路 域回落模块获取信息判断所述终端是否已在演进的分组域系统的网络即 EPS 网络进行过联合更新或者电路域回落附着, 如是, 通知所述标志信息设置单 元。
所述标志信息设置单元, 用于在收到所述标志设置判断单元的所述通知 后, 设置 EPS网络需要进行联合更新的标志信息; 具体地, 可以通过设置一 个或者多个新增的标志来实现, 或者通过设置所述终端内部更新状态为在 EPS网络需要进行更新来实现。
所述更新发起判断单元, 用于在所述终端移动到所述 EPS网络已注册的 跟踪区时, 判断是否设置有所述 EPS网络需要进行联合更新的标志信息, 如 有, 则使所述终端向移动性管理实体即 MME发起联合跟踪区和位置区更新。 该更新发起判断单元釆用的具体判断方法可参见方法流程描述中 304 的说 明。
下面, 结合图 2和图 4来详细说明本发明具体应用时的处理流程。
本发明应用到图 2所示场景下的处理流程如下:
在图 2所示第一步, UE首先在 EPS网络进行 CSFB附着或者联合 TAU 和 LAU, 在该过程结束时, UE设置在 EPS网络已经注册和更新, 并且保存 MME生成的跟踪区列表信息, UE知道联合更新成功。 当 UE在 EPS网络接 入时, MSC/VLR在需要进行寻呼时, 根据 SGs关联信息通过 SGs接口进行 CS寻呼;
在图 2所示第二步, UE从 EPS网络移动到 GSM/UMTS网络, UE在发 送 LAU请求消息给 MSC/VLR或者从 MSC/VLR接收到 LAU接受消息时, 设置移动到 EPS 网络需要进行联合更新的标志信息。 当 UE在 GSM/UMTS 网络, MSC/VLR在需要进行寻呼时, 通过 A/IU-CS接口可以寻呼到 UE;
后续当 UE从 GSM/UMTS网络移动到 EPS网络, UE根据其中设置的需 要联合更新的标志信息, 判断需要进行联合 TAU和 LAU, UE给 MME发送 联合更新请求, MME给 MSC/VLR发送位置更新请求。 MSC/VLR从 MME 接收到位置更新请求后建立 SGs关联;
后续当 UE在 EPS 网络接入, MSC/VLR需要进行 CS 业务寻呼时, MSC/VLR即可根据 SGs关联通过 SGs接口将寻呼发送到 UE。
图 4是图 2所示网络部署场景下的另一个流程。 和图 2所示流程不同的 是, UE先在 GSM/UMTS网络接入, 在 EPS网络接入时 ISR功能激活。 本发 明在图 4所示流程下的处理如下:
在图 4所示第一步,UE首先在 GSM/UMTS网络分别进行 RAU和 LAU, 在该过程结束后,UE设置在 GSM/UMTS网络的 CS域和 PS域已经分别进行 注册;当 UE在 GSM/UMTS网络, MSC/VLR在需要进行寻呼时,通过 A/IU-CS 接口可以寻呼到 UE;
在图 4所示第二步, UE从 GSM/UMTS网络移动到 EPS网络, 进行联合 TAU和 LAU, 在该过程结束时, UE设置在 EPS 网络已经注册, 并且保存 MME生成的跟踪区列表信息, UE知道联合更新成功, 并且因为终端和网络 支持 ISR功能, ISR激活, UE在 GSM/UMTS网络 PS域的注册信息继续保持。 当 UE在 EPS网络接入时, MSC/VLR在需要进行寻呼时, 根据 SGs关联信 息通过 SGs接口进行 CS寻呼;
在图 4所示第三步, UE从 EPS网络再次移动到 GSM/UMTS网络, UE 可能进行 LAU过程。当 UE进行 LAU过程,在发送 LAU请求消息给 MSC/VLR 或者从 MSC/VLR接收到 LAU接受消息时, UE设置移动到 EPS网络需要进 行联合更新的标志信息。如果 UE没有进行 LAU过程,则不进行上述设置 EPS 网络需要进行联合更新的标志信息的过程。在这种情况下,因为没有进行 LAU 过程, MSC/VLR中的关联关系信息不会被删除,后续当 UE在 EPS网络接入, MSC/VLR进行 CS寻呼时不会有问题;
后续,当 UE从 GSM/UMTS网络移动到 EPS网络, UE根据其中的 EPS 网络需要进行联合更新的标志信息, 判断是否需要进行联合 TAU和 LAU。 在需要进行联合更新的情况下, UE给 MME发送联合更新请求, MSC/VLR 从 MME接收到位置更新请求后建立 SGs关联; 当 MSC/VLR需要进行 CS 业务寻呼时, MSC/VLR根据 SGs关联通过 SGs接口将 CS寻呼发送到 UE。
如上面图 2和图 4流程所述, 使用本发明可以解决图 2所示网络场景下 MSC/VLR进行 CS业务寻呼所面临的问题。
此外, 本发明也可以应用到 CSFB另外一种场景下, 现有技术中, UE在 进行 CSFB附着或者联合 TAU和 LAU后, 从 MSC/VLR接收到 CS寻呼, 回 落到 GSM/UMTS网络 CS域进行呼叫、 补充业务等时, 在 UE中当前保存的 位置区和网络的位置区信息不同或者 MSC发生变化等情况下,需要进行位置 更新。 在网络或者终端不支持联合 RAU和 LAU的情况下, MSC/VLR会从 GERAN/UTRAN通过 A/IU-CS接口接收到 LAU请求。 在从 A/IU-CS接口接 收到 LAU请求进行位置更新过程中, MSC/VLR会删除 SGs关联关系。在 CS 回落过程中, UE也可能不需要进行位置更新过程或者位置更新是通过进行联 合 RAU/LAU完成。
当 UE在 GSM/UMTS网络结束 CS业务, 返回 EPS网络时, 如果 UE在 回落过程中进行过位置更新, 并且该位置更新不是联合路由区和位置区更新 的情况下, 需要进行联合 TAU和 LAU过程来更新 SGs关联, 否则没有必要 进行联合 TAU和 LAU过程。现有技术中没有 UE如何获知需要进行联合 TAU 和 LAU信息的方法。
将本发明应用到上述场景下, 在 CS回落过程中, UE在给 MSC/VLR发 送位置更新请求或者从 MSC/VLR接收到位置更新接受消息时, 设置其中的 EPS网络需要进行联合更新的标志信息。 如果 UE没有进行 LAU过程, 则不 进行上述设置 EPS网络需要进行联合更新的标志信息的过程;
当 UE从 GSM/UMTS网络结束 CS业务, 返回 EPS网络时, UE根据其 中的标志信息判断是否需要进行联合更新过程。在需要的情况下, UE发起联 合 TAU和 LAU, MSC/VLR从 MME接收到位置更新请求消息, 将新建与 MME之间的关联关系。
后续当 MSC/VLR需要进行 CS业务寻呼时, MSC/VLR根据 SGs关联信 息通过 SGs接口将寻呼发送到 UE。
综上所述, 利用本发明的方法, 不仅解决了引入 ISR功能后, MSC/VLR 进行寻呼时可能寻呼不到 UE 的问题, 而且实现了 UE 在 CS 回落到 UMTS/GSM网络完成 CS业务后, 从 GSM/UMTS网络返回到 EPS网络时能 够准确判断是否需要更新 (或者说重建) 关联关系, 保证了在各种情况下 MSC/VLR都能够正确地进行电路域寻呼和寻呼到 UE, 并且减少了不必要的 更新过程, 该实现方法简单, 有利于 CSFB功能以及 EPS网络的应用。
以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。
当然, 本发明还可有其它多种实施例, 本领域的技术人员可以根据本发 明作出各种相应的改变和变形, 但这些相应的改变和变形都应属于本发明所 附的权利要求的保护范围, 且不背离本发明精神及其实质。 工业实用性
本发明通过 UE在位置更新时设置 EPS需要进行联合更新的标志信息来 更新关联关系 (或者说重建关联关系) 。 利用本发明的方法, 不仅解决了引 入 ISR功能后, MSC/VLR进行寻呼时可能寻呼不到 UE的问题, 而且实现了 UE在回落到 GSM/ UMTS网络完成 CS业务后, 从 GSM/ UMTS网络返回到 EPS网络时能够准确判断需要更新关联关系,保证了在各种情况下 MSC/VLR 都能够正确地进行电路域寻呼和寻呼到 UE, 实现方法简单, 有利于 CSFB功 能以及 EPS网络的应用。

Claims

权 利 要 求 书
1、 一种关联关系更新的实现方法, 包括:
终端通过全球移动通信系统或通用移动通信系统无线接入网 GERAN/ UTRAN与移动交换中心 /拜访位置寄存器 MSC/VLR交互进行位置更新时, 如所述终端已在演进的分组域系统的网络即 EPS网络进行过联合更新或电路 域回落附着, 则所述终端设置 EPS网络需要进行联合更新的标志信息;
所述终端移动到所述 EPS网络已注册的跟踪区时, 判断是否设置有所述 EPS 网络需要进行联合更新的标志信息, 如有, 所述终端向移动性管理实体 MME发起联合跟踪区和位置区更新, 所述 MSC/VLR接收到所述 MME发送 的位置更新请求后, 更新其中保存的关联关系信息, 重建与所述 MME之间 的关联关系。
2、 如权利要求 1所述的实现方法, 其中:
所述终端是在发送位置更新请求消息时或者接收到位置更新接受消息时 设置所述 EPS网络需要进行联合更新的标志信息。
3、 如权利要求 1所述的实现方法, 其中:
所述终端设置 EPS网络需要进行联合更新的标志信息时, 通过设置一个 或者多个新增的标志来实现; 或者通过设置所述终端内部更新状态为在 EPS 网络需要进行更新, 由所述终端在移回 EPS网络进行更新时发起联合更新。
4、 如权利要求 1或 2或 3所述的实现方法, 其中:
所述终端、 GSM/ UMTS和 EPS网络均支持空闲模式下节约信令即 ISR 功能, ISR激活;
所述 MSC/VLR和所述 MME之间支持 SGs接口;
所述 MSC/VLR和所述 GPRS服务支持节点 SGSN之间不支持 Gs接口, 和 /或所述终端不支持联合路由区和位置区更新。
5、 如权利要求 4所述的实现方法, 其中: 在所述终端进行所述位置更新之前, 所述终端在 EPS网络完成电路域回 落附着或者联合跟踪区和位置区更新后, 设置在 EPS网络已经注册和更新, 且保存 MME生成的跟踪区列表信息;
当所述终端从所述 EPS 网络移动到 GSM/UMTS 网络后, 通过 GERAN/UTRAN与所述 MSC/VLR交互进行所述位置更新。
6、 如权利要求 4所述的实现方法, 其中:
在所述终端进行所述位置更新之前, 所述终端在 EPS网络完成电路域回 落附着或者联合跟踪区和位置区更新;
之后,所述终端从 MSC/VLR接收到电路域业务寻呼,回落到 GSM/UMTS 网络电路域进行业务且需要进行位置更新时,通过所述 GERAN/UTRAN与所 述 MSC/VLR交互进行所述位置更新。
7、 如权利要求 4所述的实现方法, 其中:
所述终端移动到所述 EPS网络时,判断是否设置有所述 EPS网络需要进 行联合更新的标志信息, 如有, 所述终端向移动性管理实体 MME发起联合 跟踪区和位置区更新, 否则, 终端再根据设定的其它条件判断是否需要发起 联合跟踪区和位置区更新; 或者
所述终端移动到所述 EPS网络时, 先判断当前跟踪区是否已注册, 如果 已注册, 再判断是否设置有所述 EPS网络需要进行联合更新的标志信息, 如 有, 所述终端向移动性管理实体 MME发起联合跟踪区和位置区更新。
8、 一种可实现关联关系更新的终端, 包括位置更新模块、 联合更新模块、 电路域回落模块和空闲模式下节约信令 ISR模块, 且该 ISR模块已激活, 其 中所述终端还包括关联关系更新控制模块, 该关联关系更新控制模块进一步 包括标志设置判断单元、 标志信息设置单元和更新发起判断单元, 其中: 所述标志设置判断单元用于在所述位置更新模块通过全球移动通信系统 或通用移动通信系统无线接入网即 GERAN/UTRAN与移动交换中心 /拜访位 置寄存器即 MSC/VLR交互进行位置更新时, 从所述联合更新模块和电路域 回落模块获取信息, 以判断所述终端是否已在演进的分组域系统的网络即 EPS 网络进行过联合更新或者电路域回落附着, 如是, 通知所述标志信息设 置单元;
所述标志信息设置单元用于在收到所述标志设置判断单元的所述通知 后, 设置 EPS网络需要进行联合更新的标志信息;
所述更新发起判断单元用于在所述终端移动到所述 EPS网络时, 根据所 述终端是否设置有所述 EPS网络需要进行联合更新的标志信息判断是否需要 进行联合更新, 从而使所述终端在需要联合更新的情况下向移动性管理实体 即 MME发起联合跟踪区和位置区更新。
9、 如权利要求 8所述的终端, 其中:
所述标志信息设置单元设置 EPS网络需要进行联合更新的标志信息, 是 通过设置一个或者多个新增的标志来实现, 或者通过设置所述终端内部更新 状态为在 EPS网络需要进行更新来实现。
10、 如权利要求 8或 9所述的终端, 其中:
所述更新发起判断单元在所述终端移动到所述 EPS网络时, 判断是否设 置有所述 EPS网络需要进行联合更新的标志信息, 如有, 则使所述终端向移 动性管理实体 MME发起联合跟踪区和位置区更新; 或者所述更新发起判断 单元在所述终端移动到所述 EPS网络时, 先判断当前跟踪区是否已注册, 如 果已注册, 再判断是否设置有所述 EPS网络需要进行联合更新的标志信息, 如有, 则使所述终端向移动性管理实体 MME发起联合跟踪区和位置区更新。
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