[go: up one dir, main page]

WO2014121760A1 - Procédé et dispositif pour sélectionner un appareil de réseau durant une commutation - Google Patents

Procédé et dispositif pour sélectionner un appareil de réseau durant une commutation Download PDF

Info

Publication number
WO2014121760A1
WO2014121760A1 PCT/CN2014/071906 CN2014071906W WO2014121760A1 WO 2014121760 A1 WO2014121760 A1 WO 2014121760A1 CN 2014071906 W CN2014071906 W CN 2014071906W WO 2014121760 A1 WO2014121760 A1 WO 2014121760A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
access
access network
user equipment
packet data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/071906
Other languages
English (en)
Chinese (zh)
Inventor
段小嫣
高晨亮
金辉
衣强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Device Co Ltd
Original Assignee
Huawei Device Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Device Co Ltd filed Critical Huawei Device Co Ltd
Publication of WO2014121760A1 publication Critical patent/WO2014121760A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing 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
    • H04W8/08—Mobility data transfer
    • H04W8/082—Mobility data transfer for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • a third-generation mobile communication network is implemented according to a standard organization of the 3GPP (3rd Generation Partnership Project), which can be called a mobile communication network or a 3GPP network, and is currently the most widely used application.
  • Wide area mobile communication network The WLAN (Wireless Local Access Network) is widely deployed and used as a local communication network with convenient access, high speed and relatively low price. Users can use the UE (User Equipment) to access the 3GPP network or WLAN network for data services, such as accessing the Internet, downloading text/audio/video data, and so on.
  • the UE can also access the 3GPP core network through the WLAN to facilitate access to the Internet through the 3GPP core network, thereby implementing interworking between the 3GPP network and the WLAN, facilitating the 3GPP network to offload data payloads to the WLAN, and perform unified charging and QoS (Quality of Service). , quality of service) control, etc.
  • QoS Quality of Service
  • the 3GPP standard specifies that the UE passes TWAN (Trusted Wireless Access).
  • EPC evolved packet core network
  • EPC evolved Packet Core, Evolved Packet Core
  • TWAN is based on 3GPP HSS (Home Subscriber Server) , the home subscription server) /AAA Server (Authentication, Authorization and Accounting Server) obtained the subscription data for the UE to select the default APN (Access Point Name).
  • the default APN is marked as "default" in the subscription data corresponding to the UE. (default) APN; when the UE registers with the network or requests to establish a packet data connection, if the UE does not provide the APN, the network side uses the default APN.
  • the UE uses when accessing through the TWAN
  • the default APN may be different from the default APN used by the UE when accessing the 3GPP, so that the PDN GW (Packet Data Network Gateway) used by the UE during TWAN access may be the PDN used by the UE when the 3GPP is accessed. GW is different; 2)
  • the PDN GW used by the UE during the TWAN access may also be the PDN used by the UE when the 3GPP accesses GW is different.
  • the non-3GPP access network by the trusted WLAN access network, and is used by the PDN GW and the 3GPP access network used by the non-3GPP access network after the UE switches to the 3GPP EPC through the non-3GPP access network.
  • the PDN GW is different. Then, the IP address used by the UE will be inconsistent before and after the handover, thereby causing the IP data stream transmission of the UE to be interrupted. Summary of the invention
  • An object of the present invention is to provide a method and apparatus for selecting a network device in a handover process, which aims to solve the problem that the IP data stream transmission is interrupted when the UE switches from the non-3GPP access network to the 3GPP access network.
  • an embodiment of the present invention provides a method for selecting a network device in a handover process, where the method includes:
  • the identifier of the first packet data network gateway that is used by the first access point name where the first network device is a network device that manages the user equipment by the network side, and the management is: subscription management, One or more of authentication management and location management; Selecting the first access point name as the access point name used by the session of the user equipment after switching to the first access network, and selecting the group indicated by the identifier of the first packet data network gateway.
  • the data network gateway switches to the packet data network gateway used after the first access network as the session of the user equipment.
  • the acquiring, by the first network device, the first access point that is used when the user equipment accesses a core network by using the second access network includes:
  • the first request message is a location update request or an authentication request or a gateway update request
  • the first response message is a location Updating the response or the authentication response or the gateway update response
  • the first network device being a home subscription server or an authentication server.
  • the method further includes:
  • the first request message carries the first indication information, so that the first network device determines, according to the first indication information, that the access network used by the user equipment is changed by the second access network.
  • the step of sending the first response message is performed, where the first indication information indicates that the access network used by the session before the handover is the second access network or the indication
  • the access network used by the session is switched by the second access network to the first access network; and/or the first network device determines the type of radio access technology of the user equipment by using the
  • the second access network is changed to the first access network, and the access network used by the user equipment is determined to be
  • the step of transmitting the first response message after the second access network becomes the first access network.
  • the identifier of the first packet data network gateway is specifically acquired by the first network device from a second network device, where the second network device is An authentication server used by the user equipment to access the core network through the second access network.
  • the packet data network gateway used after accessing the network is specifically:
  • the packet data network gateway indicated by the identifier is used as a packet data network gateway used after the session of the user equipment is switched to the first access network, and the second indication information indicates that the session is used before the handover.
  • the access network is the second access network or the access network indicating the use of the session is switched by the second access network to the first access network, the handover request message and/or the A response message carries the second indication information.
  • the acquiring, by using the first access network, the user equipment accessing the core network by using the second access network is specifically:
  • the first possible implementation of the first aspect, or the first possible implementation of the first aspect, or the second possible implementation of the first aspect, or the third possible implementation of the first aspect The fourth possible implementation manner of the first aspect, or the fifth possible implementation manner of the first aspect, in combination with the sixth possible implementation manner of the first aspect, in the seventh possible implementation manner
  • the switching request message carries the first access point name, so that the first request message carries the first access point name, so that the first network device is configured according to the first
  • the request message acquires an identifier of the first packet data network gateway corresponding to the first access point name.
  • the access network sent by the receiving user equipment is used to switch the access network used by the session from the second access network to the first access network.
  • the method further includes: before the step of acquiring the identifier of the first packet data network gateway corresponding to the first access point name, after the step of the handover request message, the method further includes:
  • the second packet data network gateway After receiving the message that the second packet data network gateway sends a session failure or a handover failure, performing the obtaining, by the first network device, the first packet data corresponding to the first access point name. The step of identifying the network gateway.
  • the first response message is specifically configured by the first network device Send:
  • the point name is the same, but the identifier of the first packet data network gateway is different from the identifier of the second packet data network gateway used by the user equipment when accessing the core network by using the first access network, and the second group is different.
  • the identity of the data network gateway corresponds to the second access point name.
  • the embodiment of the present invention further provides a method for selecting a network device in a handover process, where the method includes:
  • the first request message is that the third network device receives the indication sent by the user equipment to switch the access network used by the session from the second access network to the first After the handover request message of the access network is sent, the first request message is used for And obtaining, by the user equipment, an identifier of a first packet data network gateway used by the user equipment to access the core network by using the second access network, where the third network device is a network device that selects a packet data network gateway;
  • the packet data network gateway used after the session is switched to the first access network, where the first access point name is used by the user equipment when accessing the core network through the second access network.
  • the first access point name is obtained by the third network device from the handover request message or the first response message, and the identifier of the first packet data network gateway is the first The access point name corresponds.
  • the first request message is a location update request or an authentication request or a gateway update request
  • the first response message is a location update response or an authentication response or a gateway.
  • the third network device is a network device that selects a packet data network gateway.
  • the method before the step of sending the first response message to the third network device, the method further includes: determining The access network used by the user equipment is changed from the second access network to the first access network, specifically:
  • the access network is the second access network or the access network indicating that the session is used is switched from the second access network to the first access network, and the first request message carries the first An indication message; or,
  • the first access network determines that the access network used by the user equipment is changed from the second access network to the first access network.
  • the identifier of the first packet data network gateway is specifically obtained from the second network device, where the second network device is an authentication server used by the user equipment to access the core network through the second access network.
  • the identifier of the first packet data network gateway that is included in the first response message includes: the first response message carrying the first access point name and the first packet data network gateway logo.
  • the method further includes: carrying the first access point name in the handover request message, to carry the first request message The first access point name, according to the first access point name carried in the first request message, carrying at least the identifier of the first packet data network gateway in the first response message, where The identifier of the first packet data network gateway corresponds to the first access point name.
  • the fourth possible implementation manner, or the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner, before the step of sending the first response message to the third network device, also includes:
  • the access point name is different from the second access point name used by the user equipment when accessing the core network by using the first access network
  • the point name is the same, but the identifier of the first packet data network gateway is different from the identifier of the second packet data network gateway used by the user equipment when accessing the core network by using the first access network, and the second group is different.
  • the identity of the data network gateway corresponds to the second access point name.
  • the embodiment of the present invention further provides a device for selecting a network device in a handover process, where the device includes:
  • a handover request message receiving unit configured to receive a handover request message sent by the user equipment, indicating that the access network used by the session of the user equipment is switched from the second access network to the first access network; Obtaining a first access point name used when the user equipment accesses the core network by using the second access network;
  • a second acquiring unit configured to acquire, by the first network device, a first packet data network gateway corresponding to the first access point name used by the user equipment when accessing the core network by using the second access network
  • the first network device is a network device that manages the user equipment by the network side, where the management is: one or more of subscription management, authentication management, and location management; and a selecting unit, configured to select
  • the first access point name obtained by the acquiring unit is used as the access point name used after the session of the user equipment is switched to the first access network, and the first packet data network acquired by the acquiring unit is selected.
  • the packet data network gateway indicated by the identifier of the gateway is switched to the packet data network gateway used after the first access network as the session of the user equipment.
  • the second acquiring unit includes:
  • a first request message sending subunit configured to send a first request message to the first network device, where the first request message is used to request that the user equipment be connected by using the second access network
  • the identifier of the first packet data network gateway used when entering the core network
  • a first response message receiving subunit configured to receive, after the first request message sending subunit sends the first request message, a first response message sent by the first network device, where the first response message carries at least The identifier of the first packet data network gateway, where the identifier of the first packet data network gateway corresponds to the first access point name.
  • the first request message is a location update request or an authentication request or a gateway update request
  • the first response message is a location Updating the response or the authentication response or the gateway update response
  • the first network device being a home subscription server or an authentication server.
  • the first request message carries the first indication information
  • the first network device determines, according to the first indication information, that the access network used by the user equipment is changed from the second access network to the first access network, and then performing the sending the first response.
  • the first indication information indicating that the access network used by the session before the handover is the second access network or the access network indicating that the session is used is switched from the second access network to The first access network.
  • the identifier of the first packet data network gateway acquired by the second acquiring unit is specifically acquired by the first network device from the second network device, where the second network device is the user equipment The authentication server used when the access network accesses the core network.
  • the selecting unit is specifically configured to:
  • the first access point name as a location of the user equipment Determining, by the session, the access point name used after the first access network is switched, selecting the packet data network gateway indicated by the identifier of the first packet data network gateway as the session of the user equipment, switching to the a packet data network gateway used after the first access network, where the second indication information indicates that the access network used by the session before the handover is the second access network or indicates that the session is used for access
  • the network is switched by the second access network to the first access network, and the handover request message and/or the first response message carries the second indication information.
  • the first acquiring unit is specifically configured to obtain the foregoing information from the handover request message An access point name, where the handover request message carries a first access point name used by the user equipment to access the core network through the second access network; or, specifically, from the first network device Obtaining a first access point name used by the user equipment when accessing the core network by using the second access network.
  • the handover request message is carried in the seventh possible implementation manner
  • the first access point name so that the first request message carries the first access point name
  • the first network device acquires the first request message according to the first request message.
  • the identifier of the first packet data network gateway corresponding to the access point name.
  • the device before the receiving unit receives, the device further includes:
  • a session request message sending unit configured to: after the switching request message receiving unit receives the switching request message, before the second obtaining unit acquires the identifier of the first packet data network gateway, according to the user Selecting, by the device, the second access point name signed in the first access network and the identifier of the second packet data network gateway corresponding to the second access point name in the first access network to select the second group a data network gateway, sending a setup session request message to the second packet data network gateway;
  • An execution unit configured to receive, by the second packet data network gateway, a message indicating that a session failure or a handover failure is established, notify the second obtaining unit to acquire, by the first network device, the user equipment by using the second connection
  • the identifier of the first packet data network gateway corresponding to the first access point name used when accessing the core network.
  • the embodiment of the present invention further provides a device for selecting a network device in a handover process, where the device includes:
  • a first request message receiving unit configured to receive a first request message sent by the third network device, where the first request message is an access network that is sent by the third network device to receive the indication sent by the user equipment After the second access network is switched to the handover request message of the first access network, the first request message is used to request to acquire the first used by the user equipment to access the core network through the second access network.
  • An identifier of a packet data network gateway where the third network device is a network device that selects a packet data network gateway;
  • a first response message sending unit configured to send a first response message to the third network device, where the first response message carries at least the identifier of the first packet data network gateway, so that the third network device Selecting a first access point name as the access point name used by the session of the user equipment after switching to the first access network, and selecting packet data indicated by the identifier of the first packet data network gateway
  • the network gateway is used as the packet data network gateway used by the user equipment to switch to the first access network, where the first access point name is An access point name used by the user equipment when accessing the core network by using the second access network, where the first access point name is used by the third network device from the handover request message or the first Obtained in the response message, the identifier of the first packet data network gateway corresponds to the first access point name.
  • the first request message is a location update request or an authentication request or a gateway update request
  • the first response message is a location update response or an authentication response or a gateway.
  • the third network device is a network device that selects a packet data network gateway.
  • the apparatus further includes:
  • a determining unit configured to determine, before the first response message sending unit sends the first response message, that an access network used by the user equipment is changed from the second access network to the first access network .
  • the determining unit is specifically configured to:
  • the first response message sending unit Before the first response message sending unit sends the first response message, determining, according to the first indication information, that the access network used by the user equipment is changed from the second access network to the first access a network, where the first indication information indicates that an access network used by the session before handover is the second access network or an access network indicating that the session is used is switched from the second access network to The first access message, the first request message carries the first indication information; or
  • the first response message sending unit sends the first response message, determining that the type of the radio access technology of the user equipment is changed from the second access network to the first access network, The access network used by the user equipment is changed from the second access network to the first access network.
  • the identifier of the first packet data network gateway that is carried in the first response message is specifically acquired by the second network device, where the second network device is the user equipment An authentication server used when the second access network accesses the core network.
  • the identifier that the at least the first packet data network gateway carries in the first response message includes: the first response message carrying the first An access point name and an identification of the first packet data network gateway.
  • the switching request message carries the first access point name, so that the The first request message carries the first access point name, and carries at least the first packet data in the first response message according to the first access point name carried in the first request message.
  • An identifier of the network gateway where the identifier of the first packet data network gateway corresponds to the first access point name.
  • the device further includes a determining unit , specifically for:
  • the first response message sending unit Before the first response message sending unit sends the first response message, determining, by the user equipment, the first access point name used by the user equipment to access the core network by using the second access network, and the user The second access point name used by the device when accessing the core network by using the first access network is different; or Before the first response message sending unit sends the first response message, determining, by using the first access point name used by the user equipment to access the core network by using the second access network, and the user equipment The second access point name used by the first access network to access the core network is the same, but the identifier of the first packet data network gateway and the user equipment access the core network through the first access network. The identifier of the second packet data network gateway used at the time is different, and the identifier of the second packet data network gateway corresponds to the second access point name.
  • the UE when the UE switches between the access networks, the UE does not establish a connection between the UE and the new access network by assigning a new APN and a PDN GW, but obtains access through a new acquisition process.
  • the network device such as the PDN GW, used in the original access network, so that the IP address does not change after the UE switches to another access network, and the problem of interruption of the IP data stream transmission of the UE is avoided.
  • FIG. 1 is a schematic flow chart of a method for selecting a network device in a handover process according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a specific method for obtaining an identifier of a packet data network gateway according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a method for selecting a network device in another handover process according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a method for selecting a network device in another handover process according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a specific process of a method for selecting a network device in a handover process according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of another specific process of a method for selecting a network device in a handover process according to an embodiment of the present invention.
  • FIG. 7 is still another example of a method for selecting a network device in a handover process according to an embodiment of the present invention. Specific process diagram;
  • FIG. 8 is a schematic diagram of still another specific process of a method for selecting a network device in a handover process according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a device for selecting a network device in a handover process according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a specific structure of the second acquiring unit in FIG. 9;
  • FIG. 11 is a schematic structural diagram of an apparatus for selecting a network device in another switching process according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a device for selecting a network device in another handover process according to an embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of a network device according to an embodiment of the present invention
  • FIG. 14 is a schematic structural diagram of another network device according to an embodiment of the present invention.
  • FIG. 1 is a schematic flowchart of a method for selecting a network device in a handover process according to an embodiment of the present invention.
  • the method in the embodiment of the present invention may be applied to user equipment UE performing access switching between different access networks.
  • the selection of the network device including the packet data network gateway PDN GW, may be performed by a device having a network device selection function, such as an MME (Mobility Management Entity), which is specifically described in the embodiment of the present invention.
  • Methods include:
  • S101 Receive a handover request message that is sent by the user equipment to switch the access network used by the session of the user equipment from the second access network to the first access network.
  • the user equipment UE may be when receiving the network switching instruction of the user, or when detecting the overlay Generating and transmitting the indication when the cover signal is better than the second access network of the first access network
  • the access network used by the session of the UE is switched by the second access network to the handover request message of the first access network, where the handover request message is specifically a message for requesting network handover, for example, if the UE needs to connect from the non-3GPP
  • the handover request message may be an attach request message (attach request) sent by the UE to the corresponding MME.
  • S102 Obtain a first access point name used by the user equipment to access the core network by using the second access network, and obtain, by the first network device, the user equipment to access by using the second access network.
  • the first network device is a network device that manages the user equipment on the network side, such as a home subscription server HSS or an authentication server, and the management is: one of subscription management, authentication management, and location management. A variety.
  • the first network device acquires and stores the APN used by the UE and the corresponding PDN GW.
  • the first access point name may be directly obtained from the handover request message, that is, the UE may carry the user equipment through the second access network in the handover request message.
  • the first APN used when accessing the core network; that is, the first access point name may be directly reported by the user equipment.
  • the first packet data network gateway may obtain the corresponding first PDN according to the first APN to the first network device after determining the first APN of the UE. GW's logo.
  • the first network device such as an HSS, may also be obtained according to the identifier of the user equipment UE.
  • the identifier of the first PDN GW may be a first PDN GW address, or a PDN GW FQDN (Fully Qualified Domain Name).
  • S103 The first access point name is selected as the access point name used by the user equipment after the session is switched to the first access network, and the identifier of the first packet data network gateway is selected.
  • the packet data network gateway switches to the packet data network gateway used after the first access network as the session of the user equipment.
  • the UE continues to access the first access network through the APN and the PDN GW used in the second access network, thereby implementing access to the core network for various types of data access, interaction, and the like.
  • the S103 may include: selecting, according to the second indication information, the first access point name as an access point name used by the session of the user equipment after the session is switched to the first access network. And selecting, by the packet data network gateway indicated by the identifier of the first packet data network gateway, the packet data network gateway used after the session of the user equipment is switched to the first access network, the second indication
  • the information indicates that the access network used by the session before the handover is the second access network or the access network indicating that the session is used is switched from the second access network to the first access network,
  • the handover request message and/or the first response message carries the second indication information.
  • the second indication information carried in the first response message returned by the request message initiates a session establishment process.
  • the network device used when accessing the core network through the original access network before the handover is selected in the handover process is implemented by the process of the embodiment of the present invention. Specifically, During the handover process, the packet data network gateway used when accessing the core network through the original access network is selected, so that the IP address does not change after the UE switches to another access network, and the IP data flow of the UE is avoided. The problem of transmission interruption.
  • the method for obtaining an identifier of a packet data network gateway according to an embodiment of the present invention includes: S1001: Send a first request message to the first network device, where the first request message is used to request to acquire a first packet data network gateway used by the user equipment to access the core network by using the second access network. Identification
  • S1002 Receive a first response message sent by the first network device, where the first response message carries at least the identifier of the first packet data network gateway, and the identifier of the first packet data network gateway and the first An access point name corresponds.
  • the first request message may include the identifier and/or user information of the UE and/or the first APN (directly reported by the UE) used by the UE to access the second access network, etc., to facilitate the first network such as the HSS.
  • the device can search for the identifier of the PDN GW used by the UE when accessing the second access network, and return the identifier of the first PDN GW that is the discovered PDN GW identifier.
  • the UE may carry the first access point name in the handover request message, so that the first request message carries the first access point name, so that the first network device, such as the HSS, is configured according to the
  • the first request message acquires an identifier of the first packet data network gateway corresponding to the first access point name.
  • the identifier of the first packet data network gateway may be specifically acquired by the first network device from the second network device, where the second network device is accessed by the user equipment by using the second access network.
  • the authentication server used by the core network may also obtain the second network device, such as an AAA Server for authentication, authorization, and accounting, according to the identifier of the corresponding UE when receiving the first request message.
  • the UE accesses the PDN GW identifier used by the second access network, so that the first network device can return the identifier of the corresponding first PDN GW according to the first request message.
  • the first request message may be a location update request or an authentication request or a gateway update request
  • the first response message may be a location update response or an authentication response or a gateway update response corresponding to the first request message.
  • the first network device may be a home subscription server or an authentication server.
  • the first request message may be used to determine whether the access network used by the UE is switched. If yes, the identifier of the first PDN GW is obtained, and the first response message that carries the identifier of the first PDN GW is returned. This is achieved by the following steps:
  • the first request message carries the first indication information, so that the first network device determines, according to the first indication information, that the access network used by the user equipment is changed by the second access network.
  • the step of sending the first response message is performed, where the first indication information indicates that the access network used by the session before the handover is the second access network or the indication
  • the access network used by the session is switched by the second access network to the first access network; and/or the first network device determines the type of radio access technology of the user equipment by using the
  • the second access network is changed to the first access network, and determining that the access network used by the user equipment is changed from the second access network to the first access network, and the sending the first response is performed.
  • the first request message may be a location update request or an authentication request or a gateway update request, where the first request message may carry the first indication information, indicating that the access network used by the session before the handover is the second connection Entering the network or indicating that the access network used by the session is switched by the second access network to the first access network; after receiving the first request message, the first network device is configured according to the first request The first indication information carried in the message, and/or determining the type of the radio access technology of the user equipment by the second access network according to the type of the radio access technology of the user equipment stored by the first network device For the first access network.
  • the first response message is specifically sent by the first device in the following situation:
  • the point name is the same, but the identifier of the first packet data network gateway is different from the identifier of the second packet data network gateway used by the user equipment when accessing the core network by using the first access network, and the second group is different.
  • the identity of the data network gateway corresponds to the second access point name.
  • the method for obtaining the identifier of the packet data network gateway in the embodiment of the present invention may be corresponding to the acquiring, by the second network access, the user equipment from the first network device in S102 in FIG.
  • the present invention has the following advantages:
  • the handover procedure disclosed in the embodiment of the present invention can ensure that the UE continues to use the PDN GW used by the original access network to access the core network before switching, so that the IP address does not change after switching to the new access network.
  • the problem of interruption of the IP data stream transmission of the UE is avoided.
  • FIG. 3 it is a schematic flowchart of a method for selecting a network device in another handover process according to an embodiment of the present invention.
  • the method in this embodiment specifically includes:
  • S201 Receive a handover request message that is sent by the user equipment to switch the access network used by the session of the user equipment from the second access network to the first access network.
  • S202 According to the second access point name that is subscribed by the user equipment in the first access network, and the second packet data network gateway corresponding to the second access point name in the first access network.
  • the identifier selects the second packet data network gateway, and sends a setup session request message to the second packet data network gateway.
  • the handover request message when receiving the handover request message, first try to obtain the second access point name of the user equipment directly from the subscription data, and directly obtain the second packet data network gateway corresponding to the second access point name. At this time, if the obtained second access point name is the same as the first access point name when the user equipment accesses the core network through the second access network, the identifier of the corresponding second PDN GW that may be obtained is also The first PDN GW corresponding to an APN is the same, and a session establishment request may also be initiated to establish a session and ensure that the IP transmission is not interrupted.
  • the corresponding second PDN GW cannot identify the handover request message.
  • the switching instruction causes the session establishment to fail, and then S203 described below is executed.
  • S203 Receive a message sent by the second packet data network gateway indicating that the establishment session fails or the handover fails.
  • the following S204 needs to be performed to initiate the acquisition of the first APN and the first PDN GW used by the UE to access the second access network.
  • S204 Acquire a first access point name used by the user equipment to access the core network by using the second access network, and obtain, by the first network device, the user equipment accessing the core by using the second access network.
  • the identifier of the first packet data network gateway corresponding to the first access point name used by the network, the first network device is a network device that manages the user equipment by the network side, and the management is: signing One or more of management, authentication management, and location management.
  • the first access point name is selected as the access point name used by the session of the user equipment after the session is switched to the first access network, and the identifier of the first packet data network gateway is selected.
  • the packet data network gateway switches to the packet data network gateway used after the first access network as the session of the user equipment.
  • the embodiment of the present invention is that the access network sent by the receiving user equipment indicates that the access network used by the session is switched from the second access network to the first interface.
  • the step of the network switching request message the step of acquiring the identifiers of the first packet data network gateway corresponding to the first access point name from the first network device is newly added, and the steps of S202 and S203 are newly added.
  • the S201 and the S101 are performed in the same manner, and the S204 and S205 are corresponding to the foregoing S102 and S103, and the specific implementation process is not described herein.
  • the present invention has the following advantages:
  • the handover procedure disclosed in the embodiment of the present invention can ensure that the UE is handed over to the new access network. After that, the PDN GW used when accessing the core network through the original access network before the handover is continued, so that the IP address does not change, and the problem that the IP data stream transmission of the UE is interrupted is avoided.
  • FIG. 4 it is a schematic flowchart of a method for selecting a network device in a handover process according to an embodiment of the present invention.
  • the method in the embodiment of the present invention is applied to user equipment UE accessing between different access networks.
  • the selection of the network device including the packet data network gateway PDN GW may specifically be performed by, for example, an HSS, such as a device that performs one or more management including subscription management, authentication management, and location management on the user equipment.
  • the method of the embodiment of the present invention includes:
  • the first request message sent by the third network device is received, where the first request message is that the third network device receives the indication sent by the user equipment to switch the access network used by the session from the second access network to And sending, by the first access network, a handover request message, where the first request message is used to request to obtain an identifier of the first packet data network gateway used by the user equipment to access the core network by using the second access network.
  • the third network device is a network device that selects a packet data network gateway.
  • the third network device may be a network device such as an MME.
  • the user equipment UE may generate and send a corresponding indication to the user equipment when receiving the network switching instruction of the user, or when detecting that the coverage signal is better than the second access network of the first access network.
  • the access network used by the session is switched by the second access network to the handover request message of the first access network, where the handover request message is specifically used to request a message for performing network handover, for example, if the UE needs to switch from the non-3GPP access network.
  • the UE sends an attach request message (attach request) to the corresponding MME.
  • the first request message is a location update request or an authentication request or a gateway update request
  • the first response message may be a location update response or an authentication response or a gateway update response
  • the first response message is A network device is a home subscription server or an authentication server.
  • S302 Send a first response message to the third network device, where the first response message carries at least the identifier of the first packet data network gateway, so that the third network device selects
  • the first access point name is used as the access point name used by the session of the user equipment after switching to the first access network, and the packet data network indicated by the identifier of the first packet data network gateway is selected.
  • the gateway is used as the packet data network gateway used by the user equipment after the session is switched to the first access network, where the first access point name is the user equipment through the second access network.
  • the identifier of the gateway corresponds to the first access point name.
  • the identifier of the first packet data network gateway in the first response message may be information according to the identifier of the UE, the user information, or the first APN (directly reported by the UE) used by the UE to access the second access network.
  • the identifier of the PDN GW used by the UE to access the second access network is searched and carried in the first response message and returned to the third network device.
  • the identifier of the first packet data network gateway that is carried in the first response message may be specifically obtained from the second network device, where the second network device is the second device
  • the authentication server used when accessing the core network may also obtain the first request message, according to the identifier of the corresponding UE, to the second network device, such as the AAA Server, for performing authentication, authorization, and accounting.
  • the UE accesses the PDN GW identifier used by the first access network, so that the first network device can return the identifier of the corresponding PDN GW according to the first request message.
  • the method further includes: determining that the access network used by the user equipment is changed from the second access network to the first access network, specifically :
  • the access network is the second access network or the access network indicating that the session is used is switched from the second access network to the first access network, and the first request message carries the first An indication letter Interest; or,
  • Determining that the type of radio access technology of the user equipment is changed by the second access network to the first access network determining that an access network used by the user equipment is changed by the second access network The first access network.
  • the corresponding first packet data network gateway is obtained, or information such as the first APN is further acquired. And transmitting, in the first response message, the first PND GW and the first APN to the third network device.
  • the method for obtaining the first PND GW and the first APN may be: carrying the first access point name in the handover request message, so that the first request message carries the first The access point name, according to the first access point name carried in the first request message, carrying at least the identifier of the first packet data network gateway in the first response message, the first packet The identity of the data network gateway corresponds to the first access point name.
  • the first response message is specifically sent by the first device in the following situation:
  • the point name is the same, but the identifier of the first packet data network gateway is different from the identifier of the second packet data network gateway used by the user equipment when accessing the core network by using the first access network, and the second group is different.
  • the identity of the data network gateway corresponds to the second access point name.
  • the present invention has the following advantages:
  • the handover procedure disclosed in the embodiment of the present invention can ensure that the UE continues to use the PDN GW used when accessing the core network through the original access network before switching, after the handover to the new access network, thereby The IP address does not change, and the problem of interruption of the IP data stream transmission of the UE is avoided.
  • FIG. 5 is a schematic diagram of a specific process of a method for selecting a network device in a handover process according to an embodiment of the present invention.
  • the method of the embodiment of the present invention is applied to handover of a UE from a non-3GPP TWAN to a 3GPP access network, where the MME is a third network device, and the HSS is a first network device, and the TWAN is a second access network, 3GPP.
  • the E-UTRAN of the access network is the first access network.
  • the method specifically includes:
  • the UE is connected to the trusted wireless access network TWAN.
  • the UE may establish a PMIPv6 (Proxy Mobile IPv6) or a GTP (GPRS Tunnel Protocol) tunnel through the S2a interface between the PDN GW and the TWAN serving the UE to implement the UE and the TWAN.
  • PMIPv6 Proxy Mobile IPv6
  • GTP GPRS Tunnel Protocol
  • the UE detects an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) and decides to switch the current session from the TWAN to the E-UTRAN. Specifically, the user may set the UE to access the core network preferentially through the E-UTRAN in advance. Therefore, when the UE detects the coverage signal corresponding to the E-UTRAN, the process of switching the current session TWAN to the E-UTRAN is initiated. Of course, the UE may initiate a process of switching the current session TWAN to the E-UTRAN when the UE detects that the current E-UTRAN signal coverage is good.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • the UE initiates an attach request Attach Request to the MME, where the handover indication Handover indication may be carried to indicate that the access network used by the session of the user equipment is switched from the second access network TWAN to the first access network E-UTRAN .
  • the receiving the request message sent by the user equipment may be an attach request sent by the UE to the MME in the embodiment of the present invention, and may also be another access network used to indicate the session of the user equipment. Switching from the second access network, such as TWAN, to the first access network, such as E-UTRAN request.
  • the MME sends a signaling to the HSS to authenticate the UE, that is, the authentication operation includes determining whether the UE is a subscription user, and performing the following S5 after the authentication is passed.
  • the MME sends an update location request Update Location Request to the HSS.
  • the request message includes a RAT (Radio Access Technology) type, an MME identity, and the like that the UE currently accesses the network, to update the location information of the UE.
  • the radio access technology type RAT of the current access network is E-UTRAN.
  • the update location request is further used to request the subscription data corresponding to the UE, and specifically includes information such as the subscribed APN and the PDN GW identifier corresponding to the APN.
  • the first request message sent to the first network device may be the update location request sent by the MME to the HSS in the embodiment of the present invention, and may be used to request the HSS to acquire the UE.
  • the first indication information that is carried in the first request message may be specifically the RAT type of the UE currently accessing the network carried in the update location request message.
  • the HSS determines that the access network of the UE is changed from the TWAN to the E-UTRAN according to the pre-handover access network information of the locally stored UE, and the RAT in the update location request is E-UTRAN, and may further determine that the UE passes
  • the APN used by the TWAN access is different from the APN accessed by the E-UTRAN.
  • the APN used by the UE through the WLAN access may be a default APN or other APN (ie, a non-default APN).
  • the HSS replies to the MME with an update location acknowledgment message Update Location ACK, where the message may include the access point name APN used by the UE when accessing the core network through the TWAN, and the PDN GW used by the UE corresponding to the APN when accessing the core network through the TWAN. Identification, access network information and other information before switching. Specifically, the UE included in the message is used by the TWAN access network.
  • the access point name APN may be one or more, including at least a default APN used by the UE to access the network through the TWAN; thus, the message includes an identifier of the PDN GW corresponding to each APN.
  • the PDN GW identifier may be a PDN GW address, or a PDN GW FQDN.
  • the identifier of the PDN GW is used as a PDN GW address.
  • the PDN GW address may be an IP address of the PDN GW.
  • the information of the access network before the handover may include information such as the type of the previous radio access technology.
  • the received first response message sent by the first network device may be an update location confirmation message sent by the HSS in the embodiment of the present invention, and may also be other response messages for responding to the request of S5.
  • the information such as the access point name APN used by the UE to access the core network through the TWAN, and the identifier of the PDN GW used by the UE corresponding to the APN to access the core network through the TWAN may be carried.
  • the second indication information carried in the first response message may be the pre-switching access network information carried in the first response message.
  • the MME does not provide the APN in the attach request, and the MME selects the information of the access network in the update location confirmation message, for example, the information of the previous radio access technology type is TWAN, and selects the UE in the TWAN access in the update location confirmation message.
  • the PDN GW indicated by the identifier of the PDN GW used by the default APN used by the network and its corresponding UE when accessing the core network through the TWAN is used as the APN and PDN GW used after the current session of the UE is switched to the E-UTRAN.
  • S9 to S21 are the session establishment procedures initiated after the MME obtains the first APN and its corresponding first PDN GW identifier.
  • the MME sends a setup session request to the S-GW (Serving Gateway).
  • the request message includes the APN selected in step S8 and the address, handover indication, and other information of the corresponding PDN GW.
  • S10 The S-GW sends a setup session request to the PDN GW according to the PDN GW address in the step S9, where the message includes a handover indication and other information.
  • Sl l If PCC (Policy and Charging Control) is used in the network, the PDN GW initiates IP to the PCRF (Policy and Charging Rules Function) based on the handover indication.
  • PCC Policy and Charging Control
  • PCRF Policy and Charging Rules Function
  • the CAN (Internet Protocol-Connectivity Access Network) session 4 tampering process is performed to obtain the QoS policy and charging rules of the session after the UE switches to the new access network E-UTRAN.
  • the PDN GW sends a setup session response to the S-GW.
  • the PDN GW allocates the same IP address (that is, used by the TWAN access network) to the UE before the handover (including IPv4).
  • the address, or IPv6 prefix is carried in the setup session response message.
  • the S-GW sends a setup session response to the MME, where the IP address of the UE is carried.
  • S 14 The UE establishes a radio access bearer through the E-UTRAN.
  • S15 The MME sends a modify bearer request Modify Bearer Request to the S-GW, where the handover indication is carried.
  • the S-GW sends a modify bearer request to the PDN GW, so that the PDN GW transfers the packet data from the TWAN access system to the E-UTRAN, and immediately starts sending packet data to the S-GW.
  • the PDN GW sends a modify bearer response Modify Bearer Response to the S-GW.
  • the S-GW sends a modify bearer response to the MME.
  • S19 The UE starts transmitting and receiving data through the E-UTRAN.
  • the PDN GW initiates a resource release process to the TWAN access network to release the corresponding bearer resource of the TWAN access.
  • FIG. 6 is another schematic flowchart of another method for selecting a network device in a handover process according to an embodiment of the present invention.
  • the method of the embodiment of the present invention is applied to handover of a UE from a non-3GPP TWAN to a 3GPP access network, where the MME is a third network device, and the HSS is a first network device, and the TWAN is a second access network, 3GPP.
  • the E-UTRAN of the access network is the first access network.
  • the method specifically includes:
  • the UE is connected to the trusted wireless access network TWAN.
  • the UE may establish a PMIPv6 (Proxy Mobile IPv6) or a GTP (GPRS Tunnel Protocol) tunnel through the S2a interface between the PDN GW and the TWAN serving the UE to implement the UE and the TWAN.
  • PMIPv6 Proxy Mobile IPv6
  • GTP GPRS Tunnel Protocol
  • the UE detects the E-UTRAN and decides to switch the current session from the TWAN to the E-UTRAN. Specifically, the user may set the UE to access the core network preferentially through the E-UTRAN in advance. Therefore, when the UE detects the coverage signal corresponding to the E-UTRAN, the process of switching the current session TWAN to the E-UTRAN is initiated. Of course, when the UE detects that the current E-UTRAN signal coverage is good, the UE initiates a process of switching the current session TWAN to the E-UTRAN.
  • the UE initiates an attach request to the MME, and the message may carry a handover indication Handover indication, an access network information before handover, and other information.
  • the receiving the request message sent by the user equipment may be an attach request sent by the UE to the MME in the embodiment of the present invention, and may also be another access network used to indicate the session of the user equipment.
  • the second indication information carried by the handover request message may be in the attach request message.
  • the handover indication and/or the information about the access network before the handover may be used as the other access network for indicating the use of the session before the handover, or the connection to the session.
  • the access network is switched by the second access network to the information of the first access network.
  • the MME sends a signaling to the HSS to authenticate the UE, that is, the authentication operation includes determining whether the UE is a subscription user, and performing the following S5 after the authentication is passed.
  • the MME sends an update location request Update Location Request to the HSS, where the message includes the RAT type of the current access network, the MME identity, and the like, to update the location information of the UE.
  • the RAT type of the current access network is E-UTRAN.
  • the update location request is further used to request subscription data corresponding to the UE, and specifically includes information such as the signed APN and the PDN GW identifier corresponding to the APN.
  • the MME does not provide the APN in the attach request.
  • the MME carries an indication, such as a handover indication or an indication of handover from the WLAN, in the update location request according to the handover indication and the previous radio access technology type information in the attach request.
  • an indication such as a handover indication or an indication of handover from the WLAN, in the update location request according to the handover indication and the previous radio access technology type information in the attach request.
  • the HSS In order for the HSS to return the APN used by the UE to access the network through the WLAN according to this indication.
  • the first request message sent to the first network device may be the update location request sent by the MME to the HSS in the embodiment of the present invention, and may be used to request the HSS to acquire the UE.
  • the first indication information that is carried in the first request message may be a handover indication carried in the update location request message or an indication of handover from the WLAN, so that the HSS returns the UE to access the network through the WLAN according to the indication.
  • the APN used.
  • the HSS determines that the access network of the UE is changed from the WLAN to the E-UTRAN, and the APN used by the UE through the WLAN access is different from the APN accessed by the 3GPP. Specifically, the UE passes the specific: the HSS may determine, according to the pre-handover access network information of the locally stored UE, the RAT in the update location request is E-UTRAN, and determine that the access network of the UE is changed from WLAN to E-UTRAN; and/or, according to the indication carried in the update location request, such as the handover indication or the indication of handover from the WLAN, according to S5, determining that the access network of the UE is changed from WLAN to E-UTRAN.
  • the HSS replies to the MME with an update location confirmation message Update Location ACK.
  • the update location confirmation message carries the APN used by the UE to access the core network through the TWAN, and the PDN GW identifier used by the UE corresponding to the APN to access the core network through the TWAN.
  • the access point name APN used by the UE in the update location confirmation message to access the network through the TWAN may be one or more, where at least the default APN used by the UE to access the network through the TWAN is included;
  • the PDN GW identifier may be a PDN GW address or a PDN GW FQDN.
  • the identifier of the PDN GW is a PDN GW address.
  • the received first response message sent by the first network device may be an update location confirmation message sent by the HSS in the embodiment of the present invention, and may also be other response messages for responding to the request of S5.
  • the information such as the access point name APN used by the UE to access the core network through the TWAN, and the identifier of the PDN GW used by the UE corresponding to the APN to access the core network through the TWAN may be carried.
  • the MME selects the default APN used by the UE in the update location confirmation message to access the network through the trusted WLAN, according to the handover indication in the attach request and/or the access network information before the handover.
  • the PDN GW indicated by the identifier of the PDN GW used by the UE and the corresponding UE to access the core network through the TWAN is used as the APN and the PDN GW used after the current session of the UE is switched to the E-UTRAN.
  • S9 to S21 are the session establishment procedures initiated after the MME obtains the first APN and its corresponding first PDN GW identifier.
  • S9 The MME sends a setup session request Create Session Request to the S-GW, where the message includes the APN determined in S8 and the address of the corresponding PDN GW, the handover indication, and other information. Interest.
  • S10 The S-GW sends a setup session request to the PDN GW according to the PDN GW address in S9, where the message includes a handover indication and other information.
  • PCC Policy and Charging Control
  • PCRF Policy and Charging Rules Function
  • the PDN GW sends a setup session response to the S-GW.
  • the PDN GW allocates the same IP address (that is, used by the TWAN access network) to the UE before the handover (including IPv4).
  • the address, or IPv6 prefix is carried in the setup session response message.
  • S13 The S-GW sends a setup session response to the MME, where the IP address of the UE is carried.
  • S15 The MME sends a modify bearer request Modify Bearer Request to the S-GW, where the handover indication is carried.
  • the S-GW sends a modify bearer request to the PDN GW, so that the PDN GW transfers the packet data from the TWAN access system to the E-UTRAN, and immediately starts sending packet data to the S-GW.
  • the PDN GW sends a modify bearer response Modify Bearer Response to the S-GW.
  • the S-GW sends a modify bearer response to the MME.
  • S19 The UE starts transmitting and receiving data through the E-UTRAN.
  • the PDN GW initiates a resource release process to the TWAN access network to release the TWAN connection. Enter the corresponding bearer resource.
  • the embodiment of the present invention discloses a process for a complete UE to switch from the second access network to the first access network, and implements the same PDN GW for the UE before and after the access network handover, thereby ensuring that the UE can use the same IP address. Conduct a session to avoid data transfer interruptions.
  • FIG. 7 is another schematic flowchart of a method for selecting a network device in a handover process according to an embodiment of the present invention.
  • the method in this embodiment includes the UE switching from the TWAN of the non-3GPP network to the E-UPRAN of the 3GPP network, where the MME is the third network device, and the HSS is the first network device, and wherein the 3GPP AAA is The server is the second network device, the TWAN is the second access network, and the E-UTRAN of the 3GPP access network is the first access network.
  • the method specifically includes:
  • the UE is connected to the trusted wireless access network TWAN.
  • the UE may establish a PMIPv6 (Proxy Mobile IPv6) or a GTP (GPRS Tunnel Protocol) tunnel through the S2a interface between the PDN GW and the TWAN serving the UE to implement the UE and the TWAN.
  • PMIPv6 Proxy Mobile IPv6
  • GTP GPRS Tunnel Protocol
  • the UE detects the E-UTRAN and decides to switch the current session from the TWAN to the E-UTRAN. Specifically, the user may set the UE to access the core network preferentially through the E-UTRAN in advance. Therefore, when the UE detects the coverage signal corresponding to the E-UTRAN, the process of switching the current session TWAN to the E-UTRAN is initiated. Of course, when the UE detects that the current E-UTRAN signal coverage is good, the UE initiates a process of switching the current session TWAN to the E-UTRAN.
  • the UE initiates an attach (ie, registration) request to the MME, and the message may carry the handover indication, and may also carry the APN, and is used to indicate that the UE requests to establish (or switch) a PDN connection corresponding to the APN, and the APN may be the default.
  • APN or other APN ie non-default APN.
  • the receiving the request message sent by the user equipment may be the attach request sent by the UE to the MME according to the embodiment of the present invention, and may be used for indicating the use.
  • the access network used by the session of the user equipment is switched by the second access network, such as the TWAN, to the request message of the first access network, such as E-UTRAN.
  • the second indication information carried in the handover request message may specifically be the handover indication carried in the attach request, and may be another access network used to indicate the use of the session before the handover as the second An access network or information indicating that an access network used by the session is switched from the second access network to the first access network.
  • the MME sends a signaling to the HSS to authenticate the UE, that is, the authentication operation includes determining whether the UE is a subscription user, and performing the following S5 after the authentication is passed.
  • the MME sends an update location request Update Location Request to the HSS, where the message includes the RAT of the current access network, the MME identity, and the like, to update the location information of the UE.
  • the update location request message may also carry a handover indication and an APN provided by the UE in the attach request message.
  • the update location request is further used to request the subscription data corresponding to the UE, and specifically includes information such as the subscribed APN and the PDN GW identifier corresponding to the APN.
  • the first request message sent to the first network device may be the update location request sent by the MME to the HSS in the embodiment of the present invention, and may be used to request the HSS to acquire the UE.
  • the first indication message that is carried in the first request message may be the handover indication carried in the first request message and/or the RAT type of the UE currently accessing the network.
  • the HSS determines that the access network of the UE is changed from the WLAN to the E-UTRAN, and further, it may be determined that the APN used by the UE through the WLAN access is different from the APN accessed by the 3GPP, or the UE accesses the core network through the WLAN and passes the 3GPP.
  • the APN used by the access network to access the core network is the same but the PDN GW corresponding to the APN may be different.
  • the UE connects to the default APN or other APN through the WLAN (ie, non-default)
  • the HSS can be based on the locally stored UE's pre-switching access network information, and updated.
  • the RAT in the location request is the E-UTRAN, and the access network of the UE is determined to be changed from the WLAN to the E-UTRAN.
  • the access network carried in the update location request may further be determined to change the access network of the UE from the WLAN to the E-UTRAN.
  • the HSS sends an update packet data network gateway identifier trigger message to the 3GPP AAA Server.
  • the Update PDN GW Identity Trigger is used to trigger the 3GPP AAA Server to update the identifier of the packet data network gateway used by the UE to access the core network through the TWAN.
  • the packet data network gateway identifier trigger message carries the user identifier; the APN that is used by the locally stored UE to access the network through the WLAN, or the APN provided by the MME in the update location request message.
  • the user identifier in the update packet data network gateway identifier trigger message is an IMSI (International Mobile Subscriber Identification Number).
  • the 3GPP AAA Server sends an Update Packet Data Network Gateway Identity Request message Update PDN GW Identity Request to the HSS, where the APN carrying the UE when the TWAN access network accesses the core network and its corresponding PDN GW identifier are carried; or according to the update packet
  • the data network gateway identifies the APN in the trigger message, and carries the PDN GW identifier corresponding to the APN when the UE accesses the core network through the TWAN.
  • the HSS sends an update packet data network gateway identity confirmation message Update PDN GW Identity ACK to the 3GPP AAA Server.
  • the HSS replies to the MME with an update location confirmation message Update Location ACK.
  • the update location confirmation message includes the PDN GW identifier received by the HSS in step 8, and may also include an APN used by the UE to access the core network through the TWAN, where at least one APN corresponds to the PDN GW identifier received by the HSS in step S8.
  • the APN corresponding to the PDN GW identifier received by the HSS in step S8 may be the default APN used when the UE accesses the core network through the TWAN access network, or the same APN as the APN provided by the UE in the attach request. (If the UE provides an APN in the attach request).
  • the received first response message sent by the first network device may be an update location confirmation message sent by the HSS in the embodiment of the present invention, and may also be other response messages for responding to the request of S5.
  • the information such as the access point name APN used by the UE to access the core network through the TWAN, and the identifier of the PDN GW used by the UE corresponding to the APN to access the core network through the TWAN may be carried.
  • the MME selects, according to the APN and the handover indication provided by the UE in the attach request, the PDN GW indicated by the identifier of the PDN GW used by the UE corresponding to the APN in the update location confirmation message to access the core network through the TWAN.
  • the PDN GW used by the UE after the current session is handed over to the E-UTRAN. If the UE does not provide the APN in the attach request, the MME selects the default APN used by the UE in the update location confirmation message to access the core network through the TWAN, and the PDN GW identifier corresponding to the default APN received by the HSS in step S8.
  • the APN and PDN GW used by the UE after the current session is switched to the E-UTRAN.
  • the MME may select the APN in the E-UTRAN access network according to the operator policy. Corresponding PDN GW.
  • the PDN connection of the APN switched to the 3GPP by the WLAN will use different PDN GWs, the IP address will change, and the IP service cannot be seamlessly switched; but other benefits can be brought about, for example, avoiding the same APN using two Or additional bandwidth usage caused by multiple PDN GWs.
  • S12 to S24 are the session establishment procedures initiated after the MME obtains the first APN and its corresponding first PDN GW identifier.
  • S12 The MME sends a setup session request Create Session Request to the S-GW, where the message includes the APN and PDN GW addresses determined in the Sl, the handover indication, and other information.
  • the S-GW sends a setup session request to the PDN GW according to the PDN GW address in the establishment session request, where the message includes a handover indication and other information.
  • the PDN GW sends a session establishment response Create Session Response to the S-GW.
  • the PDN GW allocates the same IP address (including the IPv4 address or the IPv6 prefix) that the UE uses before the handover (that is, the T4), and carries the session response message.
  • S16 The S-GW sends a setup session response to the MME, where the IP address of the UE is carried.
  • the MME sends a modify bearer request Modify Bearer Request to the S-GW, where the handover indication is carried.
  • the S-GW sends a modify bearer request to the PDN GW, so that the PDN GW transfers the packet data from the TWAN access system to the E-UTRAN, and immediately starts sending packet data to the S-GW.
  • the PDN GW sends a modify bearer response Modify Bearer Response to the S-GW.
  • the S-GW sends a ⁇ ' ⁇ to the MME to change the response.
  • S22 The UE starts to send and receive data through the E-UTRAN.
  • the PDN GW initiates a resource release process to the TWAN access network to release the corresponding bearer resource of the TWAN access.
  • the MME selects a PDN GW different from the PDN GW that the WLAN accesses before the handover, for example, S11
  • the UE has established the PDN connection of the same APN in the 3GPP access network before the handover, and uses different
  • the handover request indication will not be carried in the establishment session request message.
  • Subsequent session establishment steps with existing EPS (Evolved Packet) System, Evolved Packet (Communication) System) The subsequent steps in the attach procedure for the MME to send a setup session request to the S-GW and not including the handover indication.
  • the embodiment of the present invention discloses a process for a complete UE to switch from the second access network to the first access network, and selects the same PDN GW for the UE before and after the access network handover, thereby ensuring that the UE can use the same IP.
  • the address is in session to avoid a data transmission interruption.
  • FIG. 8 is a schematic diagram of still another specific process of the method for selecting a network device in a handover process according to an embodiment of the present invention.
  • the method of this embodiment includes the UE switching from the TWAN of the non-3GPP network to the E-UPRAN of the 3GPP network, where the MME is the third network device, and the HSS is the first network device, and the 3GPP AAA Server is The second network device, the TWAN is the second access network, and the E-UTRAN of the 3GPP access network is the first access network.
  • the method specifically includes:
  • the UE is connected to the trusted wireless access network TWAN.
  • the UE may establish a PMIPv6 (Proxy Mobile IPv6) or a GTP (GPRS Tunnel Protocol) tunnel through the S2a interface between the PDN GW and the TWAN serving the UE to implement the UE and the TWAN.
  • PMIPv6 Proxy Mobile IPv6
  • GTP GPRS Tunnel Protocol
  • the UE detects the E-UTRAN and decides to switch the current session from the TWAN to the E-UTRAN. Specifically, the user may set the UE to access the core network preferentially through the E-UTRAN in advance. Therefore, when the UE detects the coverage signal corresponding to the E-UTRAN, the process of switching the current session TWAN to the E-UTRAN is initiated. Of course, when the UE detects that the current E-UTRAN signal coverage is good, the UE initiates a process of switching the current session TWAN to the E-UTRAN.
  • the UE sends an attach request to the MME, and the message may carry the handover indication, and the message may also carry the APN, and the message may be used to indicate that the UE requests to establish (or switch) the handover request message sent by the receiving user equipment.
  • the embodiment of the invention An attach request sent by the UE to the MME.
  • other access networks for indicating the use of the session of the user equipment may be switched from a second access network, such as a TWAN, to a first access network, such as an E-UTRAN. Request message.
  • the second indication information may be the handover indication carried in the attach request, and may be another access network for indicating the use of the session before the handover as the second access network or indication.
  • the access network used by the session is switched by the second access network into information of the first access network.
  • the MME sends a signaling to the HSS to authenticate the UE, that is, the authentication operation includes determining whether the UE is a subscription user, and performing the following S5 after the authentication is passed.
  • the MME sends an update location request Update Location Request to the HSS, where the message includes the RAT, the MME identity, and the like of the current access network, to update the location information of the UE.
  • the HSS returns information such as subscription data to the MME. It should be noted that this step is the same as the process in which the existing MME updates the UE location and acquires the subscription data to the HSS.
  • the MME selects the PDN GW-2 according to the subscription data and the attach request of the UE, and sends a setup session request to the S-GW, where the handover indication and the address of the PDN GW-2 are carried.
  • the S-GW sends a setup session request to the PDN GW-2, where the handover indication is carried. That is, the MME selects the second packet data according to the second access point name subscribed by the user equipment in the E-UTRAN and the identifier of the second packet data network gateway corresponding to the second access point name in the E-UTRAN. And the network gateway sends a setup session request message to the second packet data network gateway.
  • the message sent by the second packet data network gateway indicating that the session establishment failure or the handover failure is performed may be specifically that the PDN GW-2 in the embodiment of the present invention sends a session establishment session to the S-GW.
  • the complex message can of course also be a message carrying the reason for the rejection or failure, indicating that the handover cannot be performed or the session is failed.
  • S9 The S-GW forwards the session reply to the MME.
  • the MME sends a gateway update request to the HSS to request a new PDN GW.
  • the gateway update request may carry an indication, such as "handover cannot be performed” or "request new PDN GW” indication, and may also carry other information, such as: user identity (ie, IMSI), APN, PDN GW-2 identity, and the like.
  • the gateway update request may be a notification request Notify Request, or another message for requesting to update the packet data network gateway to implement handover.
  • the first request message sent to the first network device may be the gateway update request sent by the MME to the HSS in the embodiment of the present invention, and may be used to request the HSS to acquire the UE.
  • the first indication information carried in the first request message may be an indication of "switching cannot be performed” or "requesting a new PDN GW" in the first request message.
  • the HSS may determine that the access network of the UE is changed from the WLAN to the E-UTRAN according to the pre-handover access network information of the locally stored UE, and/or the gateway update request, and may further determine that the UE accesses through the WLAN.
  • the used APN is different from the APN accessed by the 3GPP, or the UE accessing the core network through the WLAN is the same as the APN used by the 3GPP access network to access the core network, but the PDN GW corresponding to the APN may be different.
  • the APN used by the UE through the WLAN access may be a default APN or other APN (ie, a non-default APN).
  • the PDN GW Identity Trigger which carries the user identifier (ie, IMSI), may also carry the locally stored APN used by the UE to access the network through the WLAN, or the APN provided by the MME in the notification request message in step S8.
  • the 3GPP AAA Server sends an Update PDN GW Identity Request message Update PDN GW Identity Request to the HSS, where the APN and the corresponding PDN GW identifier of the UE when the UE accesses the core network by the TWAN access network are carried, or the PDN GW identifier is updated according to the update
  • the APN in the trigger message carries the PDN GW identifier corresponding to the APN when the UE accesses the core network through the TWAN. That is, the identifier of the first APN and the corresponding first PDN GW.
  • the HSS replies to the MME with a gateway update response, where the message carries the PDN GW identifier received by the HSS at S13, and may also carry the APN used by the UE to access the core network through the TWAN, where at least one APN and the HSS are received in step S13.
  • the PDN GW logo corresponds.
  • the APN corresponding to the PDN GW identifier received by the HSS in step S13 may be a default APN used when the UE accesses the core network through the TWAN access network, or an APN that is the same as the APN provided by the UE in the attach request. (If the UE provides an APN in the attach request).
  • the gateway update response may be a notification response Notify Answer, or other message for providing a new packet data network gateway identifier to implement the handover.
  • the received first response message sent by the first network device may be a notification response of the HSS reply in the embodiment of the present invention, and may also be another response message for responding to the request of S10, where
  • the information such as the access point name APN used by the UE to access the core network through the TWAN, and the identifier of the PDN GW used by the UE corresponding to the APN to access the core network through the TWAN may be carried.
  • S16 to S28 are the session establishment procedures initiated after the MME obtains the first APN and its corresponding first PDN GW identifier.
  • the MME selects the PDN GW-1 according to the PDN GW identifier in the notification response, and sends a setup session request to the S-GW, where the APN, the handover indication, and the address of the PDN GW-1 are carried.
  • the S-GW sends a setup session request to the PDN GW-1, where the handover indication is carried.
  • PCC Policy and Charging Control
  • Charging Control Policy and Charging Control
  • the PDN GW-1 initiates an IP-CAN (Internet Protocol-Connectivity Access Network) session to the PCRF (Policy and Charging Rules Function) 4 tampering process to obtain the QoS policy and charging rules of the session after the UE switches to the new access network E-UTRAN.
  • IP-CAN Internet Protocol-Connectivity Access Network
  • PCRF Policy and Charging Rules Function
  • the PDN GW-1 sends a session establishment response to the S-GW, Create Session Response.
  • the PDN GW-1 allocates the same IP address (including the IPv4 address or the IPv6 prefix) that the UE is used before the handover (that is, used in the TWAN access network), and carries the session response message. in.
  • S20 The S-GW sends a setup session response to the MME, where the IP address of the UE is carried.
  • S22 The MME sends a modify bearer request Modify Bearer Request to the S-GW, where the handover indication is carried.
  • the S-GW sends a modify bearer request to the PDN GW, so that the PDN GW-1 transfers the packet data from the TWAN access system to the E-UTRAN, and immediately starts sending packet data to the S-GW.
  • the PDN GW sends a modify bearer response Modify Bearer Response to the S-GW.
  • the S-GW sends a modify bearer response to the MME.
  • S26 The UE starts transmitting and receiving data through the E-UTRAN.
  • the PDN GW initiates a resource release process to the TWAN access network to release the corresponding bearer resource of the TWAN access.
  • the embodiment of the present invention discloses a process for a complete UE to switch from the second access network to the first access network, and implements the same PDN GW for the UE before and after the access network handover, thereby ensuring that the UE can use the same IP address. Conduct a session to avoid data transfer interruptions.
  • the device for selecting a network device in the handover process of the embodiment of the present invention is described in detail below. Said.
  • FIG. 9 is a schematic structural diagram of an apparatus for selecting a network device in a handover process according to an embodiment of the present invention.
  • the device of the embodiment of the present invention may be disposed in a device having a network device selection function, such as an MME, where the device includes:
  • the handover request message receiving unit 11 is configured to receive, by the user equipment, a handover request message indicating that the access network used by the session of the user equipment is switched from the second access network to the first access network;
  • the first obtaining unit 12 is configured to acquire a first access point name used by the user equipment to access the core network through the second access network;
  • the second obtaining unit 13 is configured to acquire, from the first network device, a first packet data network gateway corresponding to the first access point name used by the user equipment to access the core network by using the second access network.
  • the first network device is a network device that manages the user equipment by the network side, where the management is: one or more of subscription management, authentication management, and location management; Selecting the first access point name acquired by the acquiring unit as the access point name used after the session of the user equipment is switched to the first access network, and selecting the first group acquired by the acquiring unit
  • the packet data network gateway indicated by the identifier of the data network gateway is used as a packet data network gateway used after the session of the user equipment is switched to the first access network.
  • the user equipment UE may generate and send a corresponding indication to the user equipment when receiving the network switching instruction of the user, or when detecting that the coverage signal is better than the second access network of the first access network.
  • the access network used by the session is switched by the second access network to a handover request message of the first access network, where the handover request message is specifically used to request a message for performing network handover, and the handover request message receiving unit 11 receives the message.
  • the request message is switched, the device selection operation is performed.
  • the first network device is a network device that manages the user equipment on the network side, such as a home subscription server HSS or an authentication server, and the management is: one of subscription management, authentication management, and location management. A variety.
  • a network device allocates and manages an APN allocated to the UE and a used PDN GW.
  • the first access point name obtained by the first acquiring unit 12 may be directly obtained from the handover request message, that is, the UE may carry the user equipment through the second in the handover request message.
  • the name of the first access point used by the access network to access the core network; that is, the name of the first access point may be directly reported by the user equipment.
  • the first access point name may be obtained from the first network device, and the first access point name used by the user equipment when accessing the core network by using the second access network may be The information such as the identifier of the device UE is obtained after requesting the search in the first network device such as the HSS.
  • the second obtaining unit 13 obtains the identifier of the first packet data network gateway, that is, the first PDN GW, and after obtaining the first APN of the UE, the second acquiring unit 13 obtains the corresponding number according to the APN to the first network device.
  • the identity of a PDN GW may also be obtained from a first network device, such as an HSS, where the identifier of the first PDN GW may be a first PDN GW address, or a PDN GW FQDN (Fully Qualified) Domain Name, full name domain name, etc.
  • the UE accesses the first access network through the APN and the PDN GW used in the second access network, thereby implementing access to the core network for various types of data access, interaction, and the like.
  • the selecting unit 14 may be configured to: select, according to the second indication information, the first access point name as the connection used by the user equipment after the session is switched to the first access network. a point data name, the packet data network gateway indicated by the identifier of the first packet data network gateway is selected as a packet data network gateway used by the user equipment to switch to the first access network, where
  • the second indication information indicates that an access network used by the session before handover is the second access network or an access network indicating that the session is used is switched from the second access network to the first
  • the access network, the handover request message and/or the first response message carries the second indication information.
  • the second acquiring unit 13 in FIG. 9 may specifically include: a first request message sending sub-unit 131, configured to send a first request message to the first network device, where the first request message is used to request that the user equipment access the core network through the second access network The identifier of the first packet data network gateway used at the time;
  • the first response message receiving sub-unit 132 is configured to receive, after the first request message sending sub-unit sends the first request message, the first response message sent by the first network device, where the first response message is at least And carrying the identifier of the first packet data network gateway, where the identifier of the first packet data network gateway corresponds to the first access point name.
  • the first request message is a location update request or an authentication request or a gateway update request
  • the first response message is a location update response or an authentication response or a gateway update response
  • the first network device is a home subscription server. Or authentication server.
  • the first request message sent by the first request message sending sub-unit 131 may include the identifier or user information of the UE or the first APN (directly reported by the UE) used by the UE to access the second access network, etc., so that The first network device, such as the HSS, can search for the PDN GW identifier used by the UE when accessing the second access network, and return the found PDN GW identifier in the locally stored PDN GW identifier.
  • the first request message sent by the first request message sending sub-unit 131 carries the first indication information, so that the first network device determines, according to the first indication information, the connection used by the user equipment. Step of performing the sending of the first response message after the second access network is changed to the first access network, where the first indication information indicates that the access network used by the session before the handover is Said second access network or an access network indicating the use of said session is switched from said second access network to said first access network.
  • the identifier of the first packet data network gateway acquired by the second acquiring unit 13 is specifically acquired by the first network device from the second network device, where the second network device is the user equipment The authentication server used when the access network accesses the core network.
  • the identifier of the first packet data network gateway is specifically obtained by the first network device from a second network device, where the second network device is accessed by the user equipment by using the second access network
  • the authentication server used by the core network may also obtain the first network request from the second network device, such as the AAA Server, for authentication, authorization, and accounting, according to the identifier of the corresponding UE when receiving the first request message.
  • the UE accesses the PDN GW identifier used by the first access network, so that the first network device can return the identifier of the corresponding PDN GW according to the first request message.
  • the first acquiring unit 12 is specifically configured to acquire the first access point name from the handover request message, where the handover request message carries the user equipment to access the core through the second access network.
  • the first access point name used by the network when the network device accesses the core network through the second access network is obtained from the first network device.
  • the handover request message may further carry the first access point name, so that the first request message carries the first access point name, so that the first network device is configured according to the first The first request message acquires an identifier of the first packet data network gateway corresponding to the first access point name.
  • the embodiment of the present invention discloses a process for a complete UE to switch from the second access network to the first access network.
  • the UE selects the same before and after the access network handover through a new interaction mode.
  • a PDN GW so that the UE can use the same IP address for the session to avoid the occurrence of data transmission interruption.
  • FIG. 11 is a schematic structural diagram of a device for selecting a network device in another handover process according to an embodiment of the present invention.
  • the device in the embodiment of the present invention may be disposed in a device having a network device selection function, such as an MME, including the foregoing handover request message receiving unit 11, the first obtaining unit 12, the second obtaining unit 13, and the selecting unit 14, and further The device further includes:
  • a session establishment message sending unit 15 configured to: after the switching request message receiving unit receives the switching request message, before the second obtaining unit acquires the identifier of the first packet data network gateway, according to the User equipment signing the second in the first access network
  • the access point name and the identifier of the second packet data network gateway corresponding to the second access point name in the first access network select a second packet data network gateway, and send the second packet data network gateway to the second packet data network gateway Establish a session request message;
  • the executing unit 16 is configured to: after receiving the message that the second packet data network gateway sends a session failure or a handover failure, notify the second acquiring unit 13 to acquire the user equipment from the first network device by using the The identifier of the first packet data network gateway corresponding to the first access point name used by the access network to access the core network.
  • the execution unit 16 first directly obtains the PDN GW by using the setup session request message sending unit 15 described above. In the case that the session connection is unsuccessful according to the identifier of the PDN GW, the first obtaining unit 12 and the second obtaining unit 13 perform corresponding operations.
  • the UE initiates the connection establishment process of the UE to the access network by assigning a new APN and a PDN GW. After the connection establishment is unsuccessful, the UE is disclosed by the embodiment of the present invention.
  • the process of obtaining the network device such as the PDN GW used in the original access network ensures that the IP address does not change after the UE switches to another access network, thereby avoiding the problem that the IP data stream transmission of the UE is interrupted.
  • FIG. 12 it is a schematic structural diagram of a device for selecting a network device in another handover process according to an embodiment of the present invention.
  • the device in the embodiment of the present invention may be configured in a network device that manages the user equipment, such as a home subscription server, an HSS, or an authentication server.
  • the device includes:
  • the first request message receiving unit 21 is configured to receive a first request message sent by the third network device, where the first request message is an access network that is sent by the third network device to receive the indication sent by the user equipment. Switching from the second access network to the handover request message of the first access network The first request message is used to request the identifier of the first packet data network gateway used by the user equipment to access the core network through the second access network, where the third network device is a selected group Network device of the data network gateway;
  • the first response message sending unit 22 is configured to send a first response message to the third network device, where the first response message carries at least the identifier of the first packet data network gateway, so that the third network
  • the device selects the first access point name as the access point name used by the session of the user equipment after switching to the first access network, and selects the group indicated by the identifier of the first packet data network gateway.
  • the data network gateway is used as the packet data network gateway used by the user equipment to switch to the first access network, where the first access point name is the user equipment through the second connection
  • the identity of the data network gateway corresponds to the first access point name.
  • the third network device may be a network device such as an MME.
  • the user equipment UE may generate and send a corresponding indication to the user equipment when receiving the network switching instruction of the user, or when detecting that the coverage signal is better than the second access network of the first access network.
  • the access network used by the session is switched by the second access network to the handover request message of the first access network, where the handover request message is specifically used to request a message for performing network handover, for example, if the UE needs to switch from the non-3GPP access network.
  • the UE sends an attach request message (attach request) to the corresponding MME.
  • the first request message in the first request message receiving unit 21 is a location update request or an authentication request or a gateway update request
  • the first response message may be a location update response or an authentication corresponding to the first request message.
  • the first network device is a home subscription server or an authentication server.
  • the identifier of the first packet data network gateway in the first response message may be based on the identifier of the UE, the user information, or the first APN used by the UE to access the second access network.
  • the identifier of the PDN GW used by the UE to access the second access network is searched and carried in the first response message and returned to the third network device. .
  • the identifier of the first packet data network gateway that is carried in the first response message may be specifically obtained from the second network device, where the second network device is the second device
  • the authentication server used when accessing the core network may also obtain the first request message, according to the identifier of the corresponding UE, to the second network device, such as the AAA Server, for performing authentication, authorization, and accounting.
  • the UE accesses the PDN GW identifier used by the first access network, so that the first network device can return the identifier of the corresponding PDN GW according to the first request message.
  • the device further includes:
  • a determining unit 23 configured to determine, before the first response message sending unit 22 sends the first response message, that an access network used by the user equipment is changed from the second access network to the first interface Network access.
  • the determining unit 23 is specifically configured to: before the first response message sending unit 22 sends the first response message, determine, according to the first indication information, at least the access network used by the user equipment by the second connection The access network becomes the first access network, where the first indication information indicates that the access network used by the session before the handover is the second access network or an access network indicating that the session is used.
  • the first request message carries the first indication information; or, the first response message sending unit 22 sends the first response Before the message, determining that the type of the radio access technology of the user equipment is changed by the second access network to the first access network, determining that the access network used by the user equipment is used by the second access The network becomes the first access network.
  • the identifier of the first packet data network gateway that is carried in the first response message may be obtained by the second network device, where the second network device is the second The authentication server used by the access network to access the core network.
  • the identifier of the first packet data network gateway that is included in the first response message includes: the first ringtone
  • the first access point name and the identifier of the first packet data network gateway are carried in the message.
  • the handover request message may further carry the first access point name, so that the first request message carries the first access point name, and is carried according to the first request message.
  • the first access point name carries at least the identifier of the first packet data network gateway in the first response message, and the identifier of the first packet data network gateway is related to the name of the first access point correspond.
  • the determining unit 23 of the device is further configured to:
  • the first response message sending unit 22 sends the first response message, determining, by using the first access point name used by the user equipment to access the core network by using the second access network, The second access point name used by the user equipment when accessing the core network through the first access network is different; or
  • the first response message sending unit 22 sends the first response message, determine the first access point name used by the user equipment to access the core network through the second access network, and the user equipment
  • the second access point name used by the first access network to access the core network is the same, but the identifier of the first packet data network gateway and the user equipment access the core through the first access network
  • the identifier of the second packet data network gateway used by the network is different, and the identifier of the second packet data network gateway corresponds to the second access point name.
  • the network device such as the PDN GW used in the original access network can be obtained through the process disclosed in the embodiment of the present invention, and the IP address does not change after the UE switches to another access network. The problem of interruption of the IP data stream transmission of the UE is avoided.
  • a computer storage medium storing a program, the program being executed comprising an embodiment of the method corresponding to any of the above Figures 1 to 8.
  • FIG. 13 is a schematic structural diagram of a network device according to an embodiment of the present invention.
  • the network device in the embodiment of the present invention may be a device having a network device selection function, such as an MME.
  • the network The device includes: a transmitter 100, a receiver 200, and a processor 300, wherein the processor 300 performs the following steps:
  • the data network gateway switches to the packet data network gateway used after the first access network as the session of the user equipment.
  • the processor 300 performs, by acquiring, by the first network device, a first packet data network corresponding to the first access point name used by the user equipment to access the core network through the second access network.
  • the steps of identifying the gateway include:
  • the receiver 200 is configured to receive the first response message sent by the first network device, where the first response message carries at least the identifier of the first packet data network gateway, and the identifier of the first packet data network gateway Corresponding to the first access point name.
  • the processor 300 controls the transmitter 100 to send a first request message to the first network device as a location update request or an authentication request or a gateway update request, where the first response message is a location update response or a reference.
  • the right response or the gateway update response, the first network device is a home subscription server or an authentication server. Further, the processor 300 further performs the following steps:
  • the first request message carries the first indication information, so that the first network device determines, according to the first indication information, that the access network used by the user equipment is changed by the second access network.
  • the step of sending the first response message is performed, where the first indication information indicates that the access network used by the session before the handover is the second access network or the indication
  • the access network used by the session is switched by the second access network to the first access network; and/or the first network device determines the type of radio access technology of the user equipment by using the
  • the second access network is changed to the first access network, and determining that the access network used by the user equipment is changed from the second access network to the first access network, and the sending the first response is performed.
  • the identifier of the first packet data network gateway acquired by the processor 300 is specifically acquired by the first network device from the second network device, and the second network device is the second The authentication server used by the access network to access the core network.
  • the processor 300 performs the selecting the first access point name as the access point name used by the session of the user equipment after switching to the first access network, and selecting the first
  • the step of the packet data network gateway indicated by the identifier of the packet data network gateway as the packet data network gateway used after the session of the user equipment is switched to the first access network is specifically:
  • the packet data network gateway indicated by the identifier is used as a packet data network gateway used after the session of the user equipment is switched to the first access network, and the second indication information indicates that the session is used before the handover.
  • the access network is the second access network or the access network indicating the use of the session is switched by the second access network to the first access network, the handover request message and/or the A response message carries the second indication information.
  • the processor 300 performs the acquiring the user equipment by using the second
  • the name of the first access point used when the access network accesses the core network is specifically:
  • the processor 300 controls the switch request message received by the receiver 200 to carry the first access point name, so that the first request message carries the first access point name, and further So that the first network device acquires an identifier of the first packet data network gateway corresponding to the first access point name according to the first request message.
  • the processor 300 performs the step of transmitting, by the receiving user equipment, a handover request message indicating that the access network used by the session is switched from the second access network to the first access network, from the first Before the step of acquiring, by the network device, the identifier of the first packet data network gateway corresponding to the first access point name, performing the following steps:
  • the identifier of the second packet data network gateway corresponding to the second access point name in the first access network according to the second access point name that is subscribed by the user equipment in the first access network Selecting a second packet data network gateway, and sending a setup session request message to the second packet data network gateway;
  • the second packet data network gateway After receiving the message that the second packet data network gateway sends a session failure or a handover failure, performing the obtaining, by the first network device, the first packet data corresponding to the first access point name. The step of identifying the network gateway.
  • the processor 300 controls the first response message received by the receiver 200 to be specifically sent by the first network device in the following situation:
  • Determining, by the user equipment, the first access point name used when the user equipment accesses the core network by using the second access network, and the second used by the user equipment when accessing the core network by using the first access network Access point name is different; or, Determining, by the user equipment, the first access point name used when accessing the core network by using the second access network, and the second access used by the user equipment when accessing the core network by using the first access network
  • the point name is the same, but the identifier of the first packet data network gateway is different from the identifier of the second packet data network gateway used by the user equipment when accessing the core network by using the first access network, and the second group is different.
  • the identity of the data network gateway corresponds to the second access point name.
  • the device having the network device selection function on the network side such as the MME, selects the same gateway device as the PDN GW before the handover, so as to ensure that the UE is switched from the old access network to the new access network.
  • FIG. 14 is a schematic structural diagram of another network device according to an embodiment of the present invention.
  • the network device in the embodiment of the present invention may be a device that manages the user equipment on the network side, such as an HSS.
  • the network device of the embodiment of the present invention includes: a transmitter 400, a receiver 500, and a processor 600, where the processor 600 performs the following Steps:
  • the first request message is used to request to acquire the first packet data used by the user equipment to access the core network through the second access network.
  • the access point name is used as the access point name used by the user equipment after the session is switched to the first access network, and the packet data network gateway indicated by the identifier of the first packet data network gateway is selected as The session of the user equipment is switched to the first a packet data network gateway used after accessing the network, where the first access point name is an access point name used by the user equipment to access the core network through the second access network, the first The access point name is obtained by the third network device from the handover request message or the first response message, and the identifier of the first packet data network gateway corresponds to the first access point name.
  • the processor 600 controls the first request message received by the receiver 500 to be a location update request or an authentication request or a gateway update request, where the first response message is a location update response or an authentication response or a gateway.
  • the third network device is a network device that selects a packet data network gateway.
  • the processor 600 further includes the following steps:
  • Determining that the access network used by the user equipment is changed from the second access network to the first access network specifically: determining, according to at least the first indication information, that the access network used by the user equipment is The second access network becomes the first access network, where the first indication information indicates that the access network used by the session before the handover is the second access network or indicates that the session is used.
  • the access network is switched by the second access network to the first access network, and the first request message carries the first indication information; or, by determining the type of the radio access technology of the user equipment, The second access network is changed to the first access network, and the access network used by the user equipment is determined to be changed from the second access network to the first access network.
  • the processor 600 controls that the identifier of the first packet data network gateway carried in the first response message sent by the transmitter 400 is specifically acquired from a second network device, where the second network
  • the device is an authentication server used when the user equipment accesses the core network through the second access network.
  • the processor 600 is configured to control the identifier of the first packet data network gateway in the first response message sent by the transmitter 400, where: the first response message carries the first interface The entry name and the identity of the first packet data network gateway.
  • the processor 600 further performs the following steps: Carrying the first access point name in the handover request message, so that the first request message carries the first access point name, according to the first carried in the first request message. And an identifier of the first packet data network gateway, where the identifier of the first packet data network gateway corresponds to the first access point name.
  • the processor 600 controls the transmitter 400 to perform the following steps before the step of sending the first response message to the third network device:
  • the point name is the same, but the identifier of the first packet data network gateway is different from the identifier of the second packet data network gateway used by the user equipment when accessing the core network by using the first access network, and the second group is different.
  • the identity of the data network gateway corresponds to the second access point name.
  • the device that performs the subscription management and/or the authentication management and/or the location management on the network device provides the device with the network device selection function on the network side, such as the MME, to provide the UE before the handover.
  • the APN and the identifier of the gateway device such as the PDN GW, so that the device with the network device selection function on the network side, such as the MME, selects the same gateway device as the PDN GW for the UE before the handover, and ensures that the UE switches from the old access network to the new one.
  • the session can continue to be used with the same IP address to avoid data transmission interruption.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory. RAM) and so on.

Landscapes

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

Abstract

Des modes de réalisation de la présente invention portent sur un procédé et un appareil pour sélectionner un dispositif de réseau durant une commutation. Le procédé consiste à : recevoir un message de requête de commutation qui est envoyé par un équipement utilisateur (UE) et utilisé pour indiquer de commuter un réseau d'accès utilisé par une session de l'équipement utilisateur d'un second réseau d'accès à un premier réseau d'accès ; acquérir un premier nom de point d'accès utilisé lorsque l'équipement utilisateur accède à un réseau d'infrastructure par l'intermédiaire du second réseau d'accès et un identificateur d'une première passerelle de réseau de données par paquets correspondant au premier nom de point d'accès ; et sélectionner le premier nom de point d'accès à titre de nom de point d'accès utilisé après que la session de l'équipement utilisateur a été commutée vers le premier réseau d'accès, et sélectionner une passerelle de réseau de données par paquets indiquée par l'identificateur de la première passerelle de réseau de données par paquets à titre de passerelle de réseau de données par paquets utilisée après que la session de l'équipement utilisateur a été commutée vers le premier réseau d'accès. Par adoption de la présente invention, lorsqu'un UE est commuté entre des réseaux d'accès, l'adresse IP ne changera pas, ce qui permet d'éviter efficacement le problème d'interruption de transmission de flux de données IP de l'UE.
PCT/CN2014/071906 2013-02-08 2014-02-08 Procédé et dispositif pour sélectionner un appareil de réseau durant une commutation Ceased WO2014121760A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310050277.0A CN103987092B (zh) 2013-02-08 2013-02-08 切换过程中选择网络设备的方法和装置
CN201310050277.0 2013-02-08

Publications (1)

Publication Number Publication Date
WO2014121760A1 true WO2014121760A1 (fr) 2014-08-14

Family

ID=51278890

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/071906 Ceased WO2014121760A1 (fr) 2013-02-08 2014-02-08 Procédé et dispositif pour sélectionner un appareil de réseau durant une commutation

Country Status (2)

Country Link
CN (1) CN103987092B (fr)
WO (1) WO2014121760A1 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105682251B (zh) * 2014-11-19 2019-11-19 中兴通讯股份有限公司 网络连接方法及装置
ES2751653T3 (es) * 2015-05-12 2020-04-01 Ericsson Telefon Ab L M Método y nodos para gestionar acceso a servicios de EPC a través de una red no de 3GPP
EP3324677B1 (fr) * 2015-08-07 2021-07-28 Huawei Technologies Co., Ltd. Changement d'accès réseau pour un terminal d'un accès par un terminal relais à un accès direct
EP3386240B1 (fr) * 2015-12-31 2021-08-11 Huawei Technologies Co., Ltd. Procédé de basculement dans un réseau maître-esclave, dispositif maître, dispositif esclave, et système
CN107135524A (zh) * 2016-02-26 2017-09-05 中兴通讯股份有限公司 一种分组数据网关、跨分组数据网关的切换方法和系统
US11089519B2 (en) * 2016-04-13 2021-08-10 Qualcomm Incorporated Migration of local gateway function in cellular networks
JP2019125822A (ja) * 2016-05-17 2019-07-25 シャープ株式会社 端末装置、ＳＭＥ（Ｓｅｓｓｉｏｎ Ｍａｎａｇｅｍｅｎｔ Ｅｎｔｉｔｙ）、および通信制御方法
CN107404736B (zh) * 2016-05-18 2019-12-10 电信科学技术研究院 一种切换方法、设备及网络架构
JP2019149588A (ja) * 2016-07-04 2019-09-05 シャープ株式会社 端末装置、制御装置、ゲートウェイ、及び通信制御方法
WO2018040232A1 (fr) * 2016-08-29 2018-03-08 华为技术有限公司 Procédé et dispositif de commutation
CN107889175A (zh) * 2016-09-30 2018-04-06 中兴通讯股份有限公司 网络切换方法、装置及系统，网络接入方法及装置
US20180103413A1 (en) * 2016-10-10 2018-04-12 GM Global Technology Operations LLC Dynamic assignment of regional network settings
CN108632953A (zh) * 2017-02-10 2018-10-09 中兴通讯股份有限公司 一种实现多接入管理的方法及装置
CN108632892B (zh) * 2017-03-24 2022-02-25 华为技术有限公司 无线通信方法、终端、接入网设备和网络系统
CN109150808B (zh) * 2017-06-19 2021-11-09 华为技术有限公司 通信方法、装置和系统
CN110366214B (zh) * 2018-04-09 2021-06-15 华为技术有限公司 一种语音业务的网络切换方法及装置
CN110366270B (zh) 2018-04-10 2021-08-13 华为技术有限公司 通信方法及装置
CN110839261B (zh) * 2018-08-15 2021-10-26 华为技术有限公司 数据传输的方法和装置
CN112654071B (zh) * 2020-12-31 2023-10-24 广州技象科技有限公司 基于物联网的下行数据传输方法、装置、设备及存储介质
CN112398954B (zh) * 2021-01-18 2021-05-04 广州技象科技有限公司 一种基于窄带物联网的连接管理方法及装置
CN114363882A (zh) * 2021-12-31 2022-04-15 展讯半导体(成都)有限公司 数据卡切换方法及装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101188553A (zh) * 2007-06-22 2008-05-28 中兴通讯股份有限公司 通知归属用户服务器保存分组数据网网关地址信息的方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101668280B (zh) * 2008-09-01 2012-07-04 华为技术有限公司 网络切换方法和管理设备、终端及归属位置服务器

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101188553A (zh) * 2007-06-22 2008-05-28 中兴通讯股份有限公司 通知归属用户服务器保存分组数据网网关地址信息的方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
3GPP: "Architecture enhancements for non-3GPP accesses (Release 10)", 3GPP TS 23.402, March 2012 (2012-03-01) *
3GPP: "General Packet Radio Service (GPRS), enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN), access (Release 10)", 3GPP TS 23.401, March 2012 (2012-03-01) *

Also Published As

Publication number Publication date
CN103987092B (zh) 2018-09-21
CN103987092A (zh) 2014-08-13

Similar Documents

Publication Publication Date Title
WO2014121760A1 (fr) Procédé et dispositif pour sélectionner un appareil de réseau durant une commutation
JP5044020B2 (ja) Ｌｔｅシステムにおいて、ユーザ静的ｉｐアドレスのアドレッシングをサポートする方法、システムおよび装置
US9019890B2 (en) Method for selecting a policy and charging rules function server on a non-roaming scene
CN101330753B (zh) 一种资源创建方法、资源删除方法及网络设备
US9686231B2 (en) Method for acquiring information and network equipment
US9717019B2 (en) Data flow control method, and related device and communications system
EP2533570B1 (fr) Équipement utilisateur, noeud d'accès et procédés correspondants pour le maintien des connexions réseau pdn multiples pendant un transfert inter-technologie en mode inactif
US9560048B2 (en) Method for updating identity information about packet gateway, AAA server and packet gateway
CN101730172B (zh) 基于接入网选择的切换方法与装置
CN102047722B (zh) 使用资源准备的从非3gpp接入到3gpp接入的rat间切换
US8873510B2 (en) Gateway selection method, apparatus and system during heterogeneous network handover
WO2009006848A1 (fr) Procédé de commutation de réseau d'accès, dispositif de gestion d'ancrage, et dispositif d'accès mobile
WO2008119296A1 (fr) Procédé et dispositif permettant de réaliser la négociation du protocole de gestion de la mobilité
WO2010108420A1 (fr) Procédé, système de réseau, et entité à fonction d'interfonctionnement permettant de traiter la commutation d'un service de communication
WO2019225326A1 (fr) Dispositif utilisateur, dispositif de commande et procédé de commande de communication
WO2009062392A1 (fr) Procédé de transfert de système, système de communication et entité pcrf
WO2009046598A1 (fr) Procédé pour établir une porteuse dédiée pour un terminal utilisateur
US9516681B2 (en) Method, device and system for accessing core network by means of non-3GPP access
CN101483899B (zh) 一种切换过程中发起源网络承载释放的方法、系统及网络锚点
WO2013097614A1 (fr) Procédé et système d'attribution d'adresse ip à un ue, et tnan et ue
CN103905570B (zh) 多栈承载的ip地址删除处理、删除方法及装置
WO2011054244A1 (fr) Procédé, dispositif et système de mise à jour d'informations de passerelle d'un réseau de données de paquet

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14749351

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14749351

Country of ref document: EP

Kind code of ref document: A1