WO2012113153A1 - Packet data network (pdn) connection establishment method and equipment - Google Patents

Packet data network (pdn) connection establishment method and equipment Download PDF

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Publication number
WO2012113153A1
WO2012113153A1 PCT/CN2011/071304 CN2011071304W WO2012113153A1 WO 2012113153 A1 WO2012113153 A1 WO 2012113153A1 CN 2011071304 W CN2011071304 W CN 2011071304W WO 2012113153 A1 WO2012113153 A1 WO 2012113153A1
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WO
WIPO (PCT)
Prior art keywords
gateway
packet data
data network
information
pdn connection
Prior art date
Application number
PCT/CN2011/071304
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French (fr)
Chinese (zh)
Inventor
于益俊
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2011/071304 priority Critical patent/WO2012113153A1/en
Priority to CN201180000800.8A priority patent/CN102972084B/en
Publication of WO2012113153A1 publication Critical patent/WO2012113153A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a packet data network PDN connection establishing method and device. Background technique
  • the Evolved Packet System consists of an access system and an Evolved Packet Core Network (EPC). Access systems are generally classified into an Evolved Universal Territorial Radio Access Network (E-UTRAN) (also commonly referred to as a 3GPP access network) and a non-3GPP access network.
  • E-UTRAN Evolved Universal Territorial Radio Access Network
  • non-3GPP (non-3GPP) access network refers to an unconventional 3GPP access network technology, for example, accessing an EPC through a WiFi wireless network, and accessing an EPC through a Code Division Multiple Access (CDMA) wireless network. And access to EPC through the Worldwide Interoperability for Microwave Access (WiMax) wireless network.
  • WiMax Worldwide Interoperability for Microwave Access
  • the PDN connection is an access.
  • a data channel between a gateway network element (eg, eNodeB, ePDG, etc.), a Serving Gateway (S-GW), and a packet data network gateway (PDN Gateway; P-GW).
  • a gateway network element eg, eNodeB, ePDG, etc.
  • S-GW Serving Gateway
  • PDN Gateway Packet Data Network Gateway
  • the P-GW information is stored in a Home Subscriber Server (HSS), and when the UE moves between the E-UTRAN and the non-3GPP access network, the handover target is switched.
  • the side access gateway network element or Mobility Management Entity (MME) can obtain P-GW information from the HSS to build The PDN connection to the P-GW is established, that is, the PDN connection before the handover is resumed on the target side.
  • MME Mobility Management Entity
  • the P-GW information cannot be saved in the home subscriber server during the PDN connection establishment process (for example, the HSS dropped the packet due to congestion at the time), resulting in the HSS.
  • the P-GW information is obsolete, so that the target side access gateway network element or the MME obtains the P-GW information from the HSS in the handover process, which is outdated P-GW information.
  • the target side access gateway The network element or the mobility management entity establishes a PDN connection to the obsolete P-GW according to the obtained P-GW information, so that the PDN connection before the handover cannot be restored on the target side, resulting in service interruption.
  • the embodiments of the present invention provide a method and a device for establishing a PDN connection in a packet data network, so as to solve the problem that the HSS saves outdated P-GW information due to congestion or abnormality in the prior art, so that the target side access during the handover process is implemented.
  • the problem that the gateway network element or the MME obtains outdated P-GW information from the HSS, causing the PDN connection to fail to be established on the target side, causes service interruption.
  • An embodiment of the present invention provides a PDN connection establishment method for a packet data network, including: a first gateway receiving a PDN connection establishment request, where the first gateway is a gateway corresponding to the first packet data network gateway information stored in the home user server;
  • the first gateway acquires second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information is established before the handover process.
  • the second gateway of the PDN connection corresponds.
  • the embodiment of the invention further provides a packet data network gateway, including:
  • a receiving module configured to receive a packet data network PDN connection establishment request, where the packet data network gateway is a gateway corresponding to the first packet data network gateway information stored in the home user server, and a connection establishment module, configured to acquire the second packet data network
  • the gateway information is such that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information corresponds to the second gateway that established the PDN connection before the handover procedure.
  • the method and device for establishing a PDN connection in a packet data network after the first gateway corresponding to the P-GW1 information stored in the home user server obtains the PDN connection establishment request, establishes a connection according to the pre-stored P-GW2 information.
  • the normal execution of the handover process between the 3GPP access network and the non-3GPP access network is ensured, and the service is guaranteed to be normal.
  • FIG. 1 is a flow chart of a first embodiment of a method for establishing a PDN connection of a packet data network according to the present invention
  • FIG. 2 is a flowchart of a PDN connection establishment process in a 3GPP network
  • FIG. 3 is a flow chart of a second embodiment of a method for establishing a PDN connection of a packet data network according to the present invention.
  • FIG. 4 is a flow chart of a third embodiment of a method for establishing a PDN connection of a packet data network according to the present invention.
  • FIG. 5 is a flowchart of a PDN connection establishment process in a non-3GPP network
  • FIG. 6 is a flow chart of a fourth embodiment of a method for establishing a PDN connection of a packet data network according to the present invention.
  • FIG. 7 is a flow chart of a fifth embodiment of a method for establishing a PDN connection of a packet data network according to the present invention.
  • FIG. 8 is a schematic structural diagram of a first embodiment of a packet data network gateway according to the present invention
  • FIG. 9 is a schematic structural diagram of a second embodiment of a packet data network gateway according to the present invention. detailed description
  • FIG. 1 is a flow chart of a first embodiment of a PDN connection establishment method for a packet data network according to the present invention. As shown in FIG. 1, the method includes:
  • the first gateway is configured to receive a PDN connection establishment request, where the first gateway is a gateway corresponding to the first packet data network gateway information stored in the home user server;
  • the first gateway acquires the second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information and the PDN are established before the handover process.
  • the connected second gateway corresponds.
  • the handover process involved in the embodiment of the present invention may be a process in which the UE switches from the 3GPP access network to the non-3GPP access network, and may also be a process in which the UE switches from the non-3GPP access network to the 3GPP access network.
  • the default PDN connection establishment process is performed, or the PDN connection establishment process is separately initiated after being attached to the access network, in the PDN connection establishment process.
  • the mobility management entity MME in the 3GPP access network or the packet data network gateway P-GW in the non-3GPP access network sends a notification request to the Home Location Register (HLR) /HSS, requesting the HLR/HSS to record the The PDN is connected to the corresponding P-GW information.
  • HLR Home Location Register
  • HLR Home Location Register
  • the gateway PG W information cannot return a notification response message to the mobility management entity MME or the P-GW, or the HLR/HSS sends a reject message to the mobility management entity or the packet data network gateway PG W, thereby enabling the mobility management entity or the packet data network.
  • Gateway The P-GW cannot successfully send the P-GW information to the HLR/HSS. In this case, the HLR/HSS stores the obsolete P-GW information (for example, the P-GW information successfully saved in the previous PDN connection establishment process).
  • the P-GW information includes a P-GW identity, which may be a P-GW address or a Fully Qualified Domain Name (FQDN) of the P-GW, and includes information related to the PDN connection.
  • the information such as the access point name (APN) may also include the identification information of the user equipment (User Equipment; UE), for example, an International Mobile Subscriber Identity (IMSI) or an international mobile device identifier. (International Mobile Equipment Identity, IM ⁇ ), etc.
  • IMSI International Mobile Subscriber Identity
  • IM ⁇ International Mobile Equipment Identity
  • the first gateway and the second gateway are both a packet data network gateway P-GW, and the first gateway is
  • the gateway pointed to by the obsolete P-GW information stored in the HLR/HSS, and the second gateway is the gateway that has established the PDN connection when the UE attaches to the 3GPP access network or the non-3GPP access network before the handover process, that is, The mobile management entity or the PDN-connected packet data network gateway (second gateway) should be sent to the gateway pointed to by the correct P-GW information in the HLR/HSS.
  • the access gateway network element in the non-3GPP access network (for example, an evolved Packet Data Gateway (ePDG)) Obtaining the stored P-GW information from the HLR/HSS, and initiating a proxy binding update message to the first gateway according to the first gateway pointed to by the P-GW information. That is, in this case, the first gateway in S101 receives the proxy binding update message (ie, the packet data network PDN connection setup request) sent by the access gateway network element, because the first gateway is not the UE attached to the 3GPP access network. The actual gateway of the PDN connection is established.
  • the proxy binding update message ie, the packet data network PDN connection setup request
  • the first gateway needs to obtain the second packet data network gateway information to establish a PDN connection between the access gateway network element and the second gateway.
  • the first gateway may directly initiate a proxy binding update message to the second gateway to establish a PDN connection between the access gateway network element and the second gateway; or the first gateway may also use the second packet data.
  • the network gateway information is sent to the access gateway network element, so that the access gateway network element initiates a proxy binding update message to the second gateway. If the UE switches from the non-3GPP access network to the 3GPP access network, the mobility management entity MME in the 3GPP access network acquires the stored P-GW information from the HLR/HSS, and according to the
  • the first gateway pointed to by the P-GW information initiates a session establishment request to the first gateway. That is, in this case, the first gateway in S101 receives the setup session request sent by the mobility management entity (ie, the packet data network PDN connection setup request), because the first gateway is not the UE attached to the non-3GPP access network to establish the PDN. The actual gateway connected, therefore, the first gateway needs to acquire the second packet data network gateway information to establish a PDN connection between the mobility management entity and the second gateway.
  • the mobility management entity ie, the packet data network PDN connection setup request
  • the first gateway may directly initiate a setup session request to the second gateway to establish a PDN connection of the mobility management entity to the second gateway; or the first gateway may also send the second packet data network gateway information to the mobile A management entity or a Serving Gateway (S-GW), so that the mobility management entity or the Serving Gateway (S-GW) initiates a session establishment request to the second gateway.
  • S-GW Serving Gateway
  • the second packet data network gateway information may be saved on the first gateway or stored in a Policy and Charging Rules Function (PCRF) network element.
  • the first gateway may obtain the second packet data network gateway information locally, or acquire the second packet data network gateway information by interacting with the PCRF.
  • PCRF Policy and Charging Rules Function
  • the access gateway network is established according to the pre-stored P-GW2 information.
  • the PDN connection of the second gateway corresponding to the P-GW2 information by the UE or the mobility management entity or the serving gateway. Ensure that the UE performs normal handover procedures between 3GPP and non-3GPP to ensure normal services.
  • the second packet data network gateway information mentioned in the previous embodiment may be stored on the first gateway, or on the PCRF.
  • the following provides a method for saving the second packet data network gateway information in the 3GPP network PDN connection establishment process.
  • the specific scenario may be a default PDN connection establishment performed by the UE during the attach process, or a separate PDN connection establishment process.
  • the first gateway is identified by P-GW1, and correspondingly, the P-GW1 information stored in the HLR/HSS is obsolete;
  • the second gateway is identified by P-GW2, and correspondingly, the second packet data network gateway information is P-GW2 information.
  • the method includes:
  • the MME sends a notification request (Notify Request) to the HLR/HSS.
  • the MME cannot carry the P-GW2 information in the notification request and send it to the HLR/HSS. That is, the P-GW1 information that has been obsolete is stored in the HLR/HSS.
  • the P-GW2 information includes the P-GW2 identifier, and may be information such as the P-GW2 address or the FQDN of the P-GW2, and may also include information such as the APN related to the PDN connection, and may further include the identifier information of the UE. For example: International Mobile Subscriber Identity (IMSI) or International Mobile Equipment Identity (IM ⁇ ).
  • IMSI International Mobile Subscriber Identity
  • IM ⁇ International Mobile Equipment Identity
  • the P-GW2 information is saved to the PCRF, and specifically includes S202-S205:
  • the MME sends a modify bearer request message to the P-GW2 by using the S-GW, where the modify bearer request message carries the indication information for saving the P-GW information.
  • the S-GW sends the modified bearer carrying the indication information of "save P-GW information" to the P-GW2.
  • Request Message Modify Bearer Request ) ;
  • the S-GW sends a Proxy Binding Update (PBU) carrying the indication information of "save P-GW information" to the P-GW2.
  • PBU Proxy Binding Update
  • the P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
  • P-GW2 will P-GW2 information according to the received indication information of "save P-GW information" (example For example, the P-GW2 identifier or the P-GW2 address, and/or the access point name (APN), and/or the identification information of the UE (IMSI or IM ⁇ , etc.) are included in the session modification request message and sent to the PCRF. Save it.
  • the P-GW2 identifier or the P-GW2 address, and/or the access point name (APN), and/or the identification information of the UE (IMSI or IM ⁇ , etc.) are included in the session modification request message and sent to the PCRF. Save it.
  • the PCRF sends an IP-CAN Session Modify Ack message to the P-GW2.
  • the P-GW2 sends a Create Session Response message or a Proxy Binding Ack (PBA) to the S-GW, and the S-GW sends a Create Session Response message to the MME.
  • PBA Proxy Binding Ack
  • Another feasible implementation manner along with S202 to S205 is: saving the P-GW2 information to the P-GW1, specifically including S206 and S207:
  • the MME sends a notification request message to the P-GW1 through the S-GW, where the notification request message carries P-GW2 information (for example: P-GW2 identifier or P-GW2 address, and/or access point name
  • API identification information
  • IMSI identification information
  • IM ⁇ identification information
  • the S-GW sends the foregoing notification request message carrying the P-G W2 information to the P-GW1;
  • the S-GW sends a PBU carrying the P-GW2 information to the P-GW1.
  • the P-GW1 After receiving the above notification request message, the P-GW1 saves the P-GW2 information on the P-GW1.
  • the P-GW1 sends a notification response message or a PBA to the S-GW, and the S-GW sends a notification response message to the MME.
  • the second packet data network gateway information (ie, P-GW2 information) may be stored in the PCRF or stored in the first gateway P-GW1 in the 3GPP network PDN connection establishment process, therefore, in the slave 3GPP access network
  • the first gateway P-GW1 can acquire the pre-stored second packet data network locally from the P-GW1 or from the PCRF.
  • the gateway information is established, thereby establishing a PDN connection between the access gateway network element and the second gateway.
  • FIG. 3 is a flowchart of a second embodiment of a PDN connection establishment method for a packet data network according to the present invention. As shown in FIG. 3, this embodiment provides a process for a UE to switch from a 3GPP access network to a non-3GPP access network. The UE performs a scenario of a handover attach process. The method includes: S301: A UE initiates an authentication authentication process to a non-3GPP access network.
  • the non-3GPP access gateway network element that interacts with the UE may be a network entity such as an ePDG or an MAG.
  • the non-3GPP access gateway network element performs an authentication and authentication process to the HSS/AAA server.
  • the Accounting Server provides the non-3GPP access gateway network element with the PDN connection related information of the U E stored before the handover process, that is, the P-GW1 information.
  • the P-GW1 information may include a P-GW identifier or a P-GW address, and may also include an APN.
  • the P-GW1 information may further include information such as identity information (such as IMSI, IM ⁇ , etc.) of the UE.
  • the UE sends an attach request message (this step is an optional step).
  • the non-3GPP access gateway network element sends a PBU message (that is, a packet data network PDN connection establishment request) to the P-GW1, where the PBU message carries a “handover attachment” indication.
  • a PBU message that is, a packet data network PDN connection establishment request
  • S307 is directly executed; if P-GW1 does not have the information of P-GW2 locally, S305 and S306 are executed first, and then S307 is executed.
  • the P-GW1 sends a session establishment request message to the PCRF (IP-CAN Session Create).
  • the session establishment request message carries the indication information, where the indication information is used to indicate that the P-GW2 information is obtained;
  • the P-GW1 After receiving the proxy binding update message, the P-GW1 sends a session establishment request message to the PCRF according to the "handover attachment" indication, where the message carries the UE identity (IMSI), the current access network type (RAT Type) of the UE, and the The PDN is connected to the corresponding access point name (APN). In addition, the message further includes indication information for indicating that the P-GW2 information is obtained. 5306.
  • the PCRF determines, according to the received session establishment request message, that the P-GW1 needs to obtain the P-GW2 information, and sends a session establishment response message (IP-CAN Session Create Ack) to the P-GW1, where the session establishment response message carries the P- GW2 information.
  • IP-CAN Session Create Ack IP-CAN Session Create Ack
  • the first gateway P-GW1 After acquiring the P-GW2 information sent by the PCRF, the first gateway P-GW1 triggers the access gateway network element to establish a PDN connection with the second gateway.
  • the method provided in this embodiment is that the P-GW1 sends the P-GW2 information to the access gateway network element, and the access gateway network element initiates a PDN connection establishment request to the P-GW2, S307 and S308.
  • the P-GW1 sends a PBA message to the non-3GPP access gateway network element, where the PBA message carries the P-GW2 information.
  • the non-3GPP access gateway network element sends a proxy binding update PBU message (ie, a PDN connection establishment request message) to the P-GW2 according to the received P-GW2 information.
  • the PBU message carries a "switching attachment" indication.
  • the PBU message may also carry the indication information of "update P-GW information".
  • the P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
  • PCRF sends a session modification response to P-GW2 (IP-CAN Session Modify
  • Ack A message carrying a Policy and Charging Control (PCC) rule.
  • the P-GW2 sends a PBA message to the non-3GPP access gateway network element.
  • the non-3GPP access gateway network element sends an attach accept message to the UE.
  • the P-GW2 sends a notification request (Notify Request) message to the HSS/AAA according to the indication information of the "update P-GW information" received in S308 or according to its own policy, and the notification request message carries the P-G W2 information.
  • Notify Request a notification request (Notify Request) message to the HSS/AAA according to the indication information of the "update P-GW information" received in S308 or according to its own policy, and the notification request message carries the P-G W2 information.
  • the HSS/AAA saves the P-GW2 information, and sends a notification response message (Notify Response) to the P-GW2.
  • S313 There is no sequence relationship between S313 and S312, and S313 can also be executed after S31 1.
  • 4 is a flowchart of a third embodiment of a method for establishing a PDN connection of a packet data network according to the present invention
  • the embodiment also provides a process for the UE to perform a handover attach process in the process of the UE switching from the 3GPP access network to the non-3GPP access network.
  • the scenario is different from the previous embodiment in that, in the previous embodiment, after the P-GW1 acquires the PG W2 information sent by the PCRF or obtains the PG W2 information according to the locally stored information, the P-GW 1 sends the P-GW2 information to the connection.
  • the access gateway network element initiates a PDN connection establishment request to the P-GW2.
  • the P-GW1 after acquiring the P-GW2 information sent by the PCRF, the P-GW1 directly initiates a PDN connection establishment request to the P-GW2. , that is, execute S407.
  • the method includes:
  • the P-GW1 forwards the PBU message to the P-GW2, where the message includes the address information of the non-3GPP access gateway network element and the "handover attachment" indication.
  • the above message may also carry the indication information of "update P-GW information".
  • the P-GW2 sends a session modification request to the PCRF.
  • the PCRF sends a session modification response to the P-GW2 (IP-CAN Session Modify).
  • the message carries the PCC rule.
  • the P-GW2 sends a PBA message to the non-3GPP access gateway network element.
  • the non-3GPP access gateway network element sends an attach accept message to the U E.
  • the P-GW2 sends a notification request (Notify Request) message to the HSS/AAA according to the indication information of the “update P-GW information” or the self-policy, and the notification request message carries
  • the HSS/AAA saves the P-GW2 information and sends a notification response message (Notify Response) to the P-GW2.
  • 2 to 4 illustrate a method of storing second packet data network gateway information during a 3GPP network PDN connection establishment process, and a PDN connection establishment procedure for handover from a 3GPP access network to a non-3GPP access network.
  • a method of saving the second packet data network gateway information during the non-3GPP network PDN connection establishment process, and a PDN connection establishment procedure for switching from the non-3GPP access network to the 3GPP access network will be described below.
  • a method for saving the second packet data network gateway information in the non-3GPP network PDN connection establishment process where the specific scenario may be the default PDN connection establishment performed by the UE during the attach process, or a separate PDN connection establishment. process.
  • the first gateway is identified by P-GW1, correspondingly, the HLR/HSS stores the obsolete P-GW1 information; the second gateway is identified by P-GW2, and correspondingly, the second group
  • the data network gateway information is the P-GW2 information.
  • the method includes:
  • S501 and P-GW2 send a notification request (Notify Request) to the HSS/AAA.
  • the S501 execution fails. For example: P - GW2 does not receive the "Notification Response" message, or receives the rejection message, so that P-GW2 cannot carry the P-GW2 information in the notification request message and send it to the HSS/AAA.
  • the P-GW2 information is saved to the PCRF, and specifically includes S502 and S503:
  • the P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
  • the P-GW2 carries the P-GW2 information in the session modification request message and sends it to the PCRF for storage.
  • the PCRF sends an IP-CAN Session Modify Ack message to the P-GW2.
  • Another feasible implementation manner along with S502-S503 is: saving the P-GW2 information to the P-GW1, specifically including S504 to S507:
  • the P-GW2 sends a notification request message to the non-3GPP access gateway network element, where the notification is requested.
  • the message carries the indication information of "update P-GW information".
  • the non-3GPP access gateway network element sends a notification request message to the P-GW1, where the notification request message carries P-GW2 information, where the P-GW2 information includes a P-GW2 identifier or a P-GW2 address, and may also include
  • the PDN is connected to the corresponding APN and the identification information of the user (for example, IMSI or IM ⁇ , etc.).
  • the P-GW1 After receiving the above message, the P-GW1 saves the P-GW2 information of the APN of the user (IMSI or IM ⁇ ).
  • the P-GW1 sends a notification response message to the non-3GPP access gateway network element.
  • the non-3GPP access gateway network element sends a notification response message to the P-GW2.
  • the second packet data network gateway information is the P-GW2 information in the non-3GPP network PDN connection establishment process
  • the information may be stored on the PCRF or stored locally in the first gateway P-GW1, and therefore, in the non-3GPP
  • the first gateway P-GW1 can obtain the pre-stored second packet data network gateway information locally from the P-GW1 or from the PCRF, thereby establishing a serving gateway (S-GW). Or a PDN connection from the mobility management entity to the second gateway.
  • FIG. 6 is a flowchart of a fourth embodiment of a PDN connection establishment method for a packet data network according to the present invention. As shown in FIG. 6, the embodiment provides a process for a UE to switch from a non-3GPP access network to a 3GPP access network. The UE performs a scenario of a handover attach process. The method includes:
  • the UE sends an attach request message ( Attach Request) to the MME, and the attach type is “Handover Attach”.
  • the MME sends an update location request message (Update Location Request) to the HLR/HSS.
  • Update Location Request Update Location Request
  • the HLR/HSS sends an update location response message to the MME (Update Location
  • the update location response message carries the PDN connection related to the UE stored before the handover procedure Information, ie P-GW1 information.
  • the P-GW1 information includes a P-GW identifier or a P-GW address, and may further include an APN, and may further include information such as identifier information (such as IMSI or IM ⁇ ) of the UE.
  • the MME selects the S-GW and the P-GW1 according to the "Handover Attachment" indication and the P-GW1 information provided by the HLR/HSS, and sends a Create Session Request message to the S-GW, where the message carries the "Handover Attachment". "Instructions.
  • the S-GW sends the above-mentioned session request message (Create Session Request) carrying the "handover attachment" indication to the P-GW1;
  • the S-GW sends a PBU message carrying the "Switch Attach" indication to the P-GW1.
  • the P-GW1 sends a session establishment request message (IP-CAN Session Create Request) to the PCRF, where the session establishment request message carries the indication information, where the indication information is used to indicate that the P-GW2 information is obtained.
  • IP-CAN Session Create Request IP-CAN Session Create Request
  • the PCRF determines, according to the received session establishment request message, that the P-GW1 needs to obtain the P-GW2 information, and sends a session establishment response message (IP-CAN Session Create Ack) to the P-GW1, where the session establishment response message carries the P- GW2 information.
  • a session establishment response message IP-CAN Session Create Ack
  • the trigger service gateway (S-GW) or the mobile management entity establishes a PDN connection with the second gateway.
  • the manner provided in this embodiment is that the P-GW1 sends the P-GW2 information to the serving gateway (S-GW) or the mobility management entity, and the serving gateway (S-GW) or the mobility management entity initiates the PDN connection establishment to the P-GW2. Request, S607 and S608.
  • the P-GW1 sends a Create Session Response message or a Create Session Reject message to the S-GW, or a PBA, where the message carries the P-G W2 information.
  • the S-GW may directly execute S608, establish a PDN connection to the P-GW2, or move to the P-GW2.
  • the mobile management entity forwards a setup session response message carrying the PG W2 information or establishes a session rejection message, and the mobility management entity selects a new service gateway S-GW according to the received P-GW2 information (the new service gateway may also be the same as the above).
  • the service gateway that forwards the message is the same network element, and sends a setup session request message to the new serving gateway S-GW to establish a PDN connection to the P-GW2, where the setup session request message carries a "handover attachment" indication and P-GW2 information.
  • S608 The S-GW sends a Create Session Request message to the P-GW2 according to the P-GW2 information received from the P-GW1 or the MME in S607.
  • the message carries the "switch attachment" indication.
  • the S-GW sends the above-mentioned session request message (Create Session Request) carrying the "handover attachment" indication to the P-GW2;
  • the S-GW sends a Proxy Binding Update (PBU) carrying the "Switch Attach" indication to the P-GW2.
  • PBU Proxy Binding Update
  • the P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
  • PCRF sends a session modification response to P-GW2 (IP-CAN Session Modify
  • the message carries the PCC rule.
  • S61 1 and P-GW2 send a session establishment response message to the S-GW (Create Session
  • the S-GW sends a setup session response message to the MME (Create
  • the message can carry P-GW2 information.
  • the MME sends an attach accept message to the UE.
  • the MME sends a notification request (Notify Request) message to the HLR/HSS according to the P-GW2 information received in S607 or S611, where the message carries the P-GW2 information.
  • Notify Request a notification request (Notify Request) message to the HLR/HSS according to the P-GW2 information received in S607 or S611, where the message carries the P-GW2 information.
  • the HLR/HSS records the P-GW2 information, and sends a notification response message (Notify Response) to the MME.
  • FIG. 7 is a flowchart of a fifth embodiment of a method for establishing a PDN connection of a packet data network according to the present invention
  • this embodiment also provides a process for the UE to perform a handover attach process in the process of the UE switching from the non-3GPP access network to the 3GPP access network.
  • the scenario is different from the previous embodiment in that, in the previous embodiment, after the P-GW1 acquires the P-GW2 information sent by the PCRF or obtains the P-GW2 information saved by itself, the P-GW1 sends the P-GW2 information to the serving gateway.
  • the P2W2 initiates a PDN connection establishment request by the serving gateway or the mobility management entity; in this embodiment, after the P-GW1 obtains the P-GW2 information sent by the PCRF or obtains the P-GW2 information saved by itself, The PDN connection establishment request is directly initiated to the P-GW2, that is, S707 is performed.
  • the method includes:
  • S701 ⁇ S706 is the same as the process of S601 ⁇ S606, and can be referred to the previous embodiment, and will not be described again.
  • the P-GW1 forwards a Create Session Request message or a PBU message to the P-GW2, where the message includes an address information of the S-GW and a “Handover Attachment” indication.
  • the P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
  • the PCRF sends an IP-CAN Session Modify Ack message to the P-GW2, where the message carries the PCC rule.
  • the P-GW2 sends a Create Session Response message or a PBA message to the S-GW, where the message carries the P-GW2 information, and the S-GW forwards the Create Session Response message to the MME.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (Random Access Memory, RAM) and so on.
  • FIG. 8 is a schematic structural diagram of a first embodiment of a packet data network gateway according to the present invention.
  • the packet data network gateway includes: a receiving module 11 and a connection establishing module 12; wherein: a receiving module 1 1 is configured to: Receiving a packet data network PDN connection establishment request, where the packet data network gateway is a gateway corresponding to the first packet data network gateway information stored in the home subscriber server;
  • the connection establishing module 12 is configured to obtain second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information and the handover process Corresponding to the second gateway that previously established the PDN connection.
  • FIG. 9 is a schematic structural diagram of a second embodiment of a packet data network gateway according to the present invention, as shown in FIG.
  • the packet data network gateway includes: a receiving module 11 and a connection establishing module 12;
  • the packet data network gateway may further include:
  • a storage module 13 configured to store second packet data network gateway information
  • the second packet data network gateway information stored in the storage module 13 is obtained from the notification request message sent by the access gateway network element or the mobility management entity via the serving gateway.
  • the second packet data network gateway information may also be stored in a policy and charging rule function network element PCRF, where the PCRF is obtained from a session modification request sent by the second gateway.
  • PCRF policy and charging rule function network element
  • connection establishing module 12 may include:
  • the sending unit 121 is configured to send a session request message to the PCRF, where the session request message carries indication information, where the indication information is used to indicate that the second packet data network gateway information is obtained, and the receiving unit 122 is configured to receive the The session response message returned by the PCRF, where the session response message carries the second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity.
  • connection establishing module 12 may be specifically configured to: send to the second gateway
  • PDN connection establishment request Or sending the second packet data network gateway information to the access gateway network element or the serving gateway or the mobility management entity, so that the access gateway network element or the serving gateway or the mobility management entity is to the second The gateway sends the PDN connection setup request.
  • the packet data network gateway information includes a packet data network gateway identifier, and the packet data network gateway identifier includes: a packet data network gateway address or a full-name domain name FQDN information of the packet data network gateway, and may further include connecting to the packet data network gateway.
  • the associated access point name APN may also include identification information of the user equipment, such as IMSI or IMEI.
  • the packet data network gateway provided by the embodiment of the present invention corresponds to the PDN connection establishment method of the packet data network provided by the embodiment of the present invention.
  • the specific implementation process can be referred to the method embodiment. Narration.
  • the packet data network gateway provided in this embodiment, after the first gateway corresponding to the P-GW1 information stored in the home subscriber server obtains the PDN connection establishment request, establishes an access gateway network element or service according to the pre-stored P-GW2 information.
  • the PDN connection of the gateway or mobility management entity to the corresponding second gateway. Ensure that the UE performs the normal execution of the handover process between 3GPP and non-3GPP to ensure that the service is normal.

Abstract

The embodiments of the present invention provide a Packet Data Network (PDN) connection establishment method and equipment. The method includes: the first gateway receives a PDN connection establishment request, wherein the first gateway is the gateway corresponding to the first PDN gateway information stored in a Home Subscriber Server (HSS); the first gateway acquires the second PDN gateway information so that the second gateway establishes a PDN connection with an access gateway network element, a mobility management entity, or a service gateway, wherein the second PDN gateway information corresponds to the second gateway which establishes a PDN connection before the handover process. The PDN connection establishment method and equipment provided by the embodiments of the present invention ensure the normal implementation of the UE handover procedure between a 3GPP access network and a non-3GPP access network, and ensure the normal operation of the service.

Description

分组数据网络 PDN连接建立方法和设备  Packet data network PDN connection establishment method and device
技术领域 Technical field
本发明涉及通信技术领域，特别涉及一种分组数据网络 PDN连接建立方 法和设备。 背景技术  The present invention relates to the field of communications technologies, and in particular, to a packet data network PDN connection establishing method and device. Background technique
演进分组***（ Evolved Packet System; EPS )由接入***和演进分组 核心网 （ Evolved Packet Core Network; EPC )组成。 接入***通常分为演 进通用陆地无线接入网 ( Evolved Universal Territorial Radio Access Network; E-UTRAN ) (一般也称为 3GPP接入网络）和非 3GPP接入网络。 所述非 3GPP ( non-3GPP )接入网络是指非传统的 3GPP接入网络技术， 例如通过 WiFi无线网络接入 EPC, 通过码多分址（Code Division Multiple Access; CDMA )无线网络接入 EPC,以及通过全球微波互联接入（ Worldwide Interoperability for Microwave Access; WiMax )无线网络接入 EPC等。 无 论通过 E-UTRAN 或者非 3GPP接入网络接入到 EPC 的用户设备 ( User Equipment; UE ) , 都需要建立 EPS网络中的分组数据网络（ Packet Data Network; PDN )连接，该 PDN连接为接入网关网元（例如： eNodeB, ePDG 等） 、 服务网关（ Serving Gateway; S-GW )以及分组数据网络网关（ PDN Gateway; P-GW )之间的数据通道。  The Evolved Packet System (EPS) consists of an access system and an Evolved Packet Core Network (EPC). Access systems are generally classified into an Evolved Universal Territorial Radio Access Network (E-UTRAN) (also commonly referred to as a 3GPP access network) and a non-3GPP access network. The non-3GPP (non-3GPP) access network refers to an unconventional 3GPP access network technology, for example, accessing an EPC through a WiFi wireless network, and accessing an EPC through a Code Division Multiple Access (CDMA) wireless network. And access to EPC through the Worldwide Interoperability for Microwave Access (WiMax) wireless network. Whether the user equipment (User Equipment; UE) accessing the EPC through the E-UTRAN or the non-3GPP access network needs to establish a Packet Data Network (PDN) connection in the EPS network, the PDN connection is an access. A data channel between a gateway network element (eg, eNodeB, ePDG, etc.), a Serving Gateway (S-GW), and a packet data network gateway (PDN Gateway; P-GW).
当 UE在 E-UTRAN和非 3GPP接入网络之间移动时， 为了保证业务不 中断， 需要保持 P-GW不变的条件下， 在新的接入网络中恢复 PDN连接。  When the UE moves between the E-UTRAN and the non-3GPP access network, in order to ensure uninterrupted service, it is necessary to maintain the P-GW unchanged, and restore the PDN connection in the new access network.
现有技术在 PDN连接建立过程中， 将 P-GW信息保存在归属用户服务 器 ( Home Subscriber Server; HSS ) 中， 当 UE在 E-UTRAN和非 3GPP 接入网络之间移动发生切换时， 切换目标侧接入网关网元或者移动管理实体 ( Mobility Management Entity; MME )能够从 HSS中获取 P-GW信息以建 立到该 P-GW的 PDN连接， 即在目标侧恢复切换前的 PDN连接。 然而， 由于 HSS可能发生拥塞或者出现异常情况而导致在 PDN连接建立 过程中， 无法将 P-GW信息保存在归属用户服务器中 （例如当时 HSS因为拥 塞而丟弃了该数据包） ， 导致 HSS中保存的是过时的 P-GW信息， 从而在切 换过程中使目标侧接入网关网元或者 MME从 HSS获取 P-GW信息是过时的 P-GW信息， 在这种情况下目标侧接入网关网元或者移动管理实体根据获取 的 P-GW信息， 建立到该过时的 P-GW的 PDN连接， 从而无法在目标侧恢复切 换前的 PDN连接， 导致业务中断。 发明内容 In the PDN connection establishment process, the P-GW information is stored in a Home Subscriber Server (HSS), and when the UE moves between the E-UTRAN and the non-3GPP access network, the handover target is switched. The side access gateway network element or Mobility Management Entity (MME) can obtain P-GW information from the HSS to build The PDN connection to the P-GW is established, that is, the PDN connection before the handover is resumed on the target side. However, due to congestion or abnormal conditions of the HSS, the P-GW information cannot be saved in the home subscriber server during the PDN connection establishment process (for example, the HSS dropped the packet due to congestion at the time), resulting in the HSS. The P-GW information is obsolete, so that the target side access gateway network element or the MME obtains the P-GW information from the HSS in the handover process, which is outdated P-GW information. In this case, the target side access gateway The network element or the mobility management entity establishes a PDN connection to the obsolete P-GW according to the obtained P-GW information, so that the PDN connection before the handover cannot be restored on the target side, resulting in service interruption. Summary of the invention
本发明实施例提供了一种分组数据网络 PDN连接建立的方法和设备，以 解决现有技术中 HSS因为拥塞或异常等原因保存了过时的 P-GW信息， 从 而使切换过程中目标侧接入网关网元或者 MME从 HSS获取过时的 P-GW信 息而导致 PDN连接在目标侧建立失败， 导致业务中断的问题。  The embodiments of the present invention provide a method and a device for establishing a PDN connection in a packet data network, so as to solve the problem that the HSS saves outdated P-GW information due to congestion or abnormality in the prior art, so that the target side access during the handover process is implemented. The problem that the gateway network element or the MME obtains outdated P-GW information from the HSS, causing the PDN connection to fail to be established on the target side, causes service interruption.
本发明实施例提供一种分组数据网络 PDN连接建立方法， 包括： 第一网关接收 PDN连接建立请求，所述第一网关为归属用户服务器中存 储的第一分组数据网络网关信息对应的网关；  An embodiment of the present invention provides a PDN connection establishment method for a packet data network, including: a first gateway receiving a PDN connection establishment request, where the first gateway is a gateway corresponding to the first packet data network gateway information stored in the home user server;
所述第一网关获取第二分组数据网络网关信息， 以使第二网关与接入网 关网元或移动管理实体或服务网关建立 PDN连接，所述第二分组数据网络网 关信息与切换过程之前建立 PDN连接的所述第二网关相对应。  The first gateway acquires second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information is established before the handover process. The second gateway of the PDN connection corresponds.
本发明实施例还提供一种分组数据网络网关， 包括：  The embodiment of the invention further provides a packet data network gateway, including:
接收模块， 用于接收分组数据网络 PDN连接建立请求， 所述分组数据网 络网关为归属用户服务器中存储的第一分组数据网络网关信息对应的网关； 连接建立模块， 用于获取第二分组数据网络网关信息， 以使第二网关与 接入网关网元或移动管理实体或服务网关建立 PDN连接，所述第二分组数据 网络网关信息与切换过程之前建立 PDN连接的所述第二网关相对应。 本发明实施例提供的分组数据网络 PDN 连接建立方法和设备， 当归属 用户服务器中存储的 P-GW1信息对应的第一网关获取到 PDN连接建立请求 后， 根据预先存储的 P-GW2信息建立接入网关网元或移动管理实体或服务 网关到 P-GW2信息对应的第二网关的 PDN连接。保证 UE在 3GPP接入网 络和非 3GPP接入网络之间切换流程的正常执行， 保证业务正常进行。 附图说明 a receiving module, configured to receive a packet data network PDN connection establishment request, where the packet data network gateway is a gateway corresponding to the first packet data network gateway information stored in the home user server, and a connection establishment module, configured to acquire the second packet data network The gateway information is such that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information corresponds to the second gateway that established the PDN connection before the handover procedure. The method and device for establishing a PDN connection in a packet data network according to an embodiment of the present invention, after the first gateway corresponding to the P-GW1 information stored in the home user server obtains the PDN connection establishment request, establishes a connection according to the pre-stored P-GW2 information. The PDN connection of the gateway gateway or the mobility management entity or the serving gateway to the second gateway corresponding to the P-GW2 information. The normal execution of the handover process between the 3GPP access network and the non-3GPP access network is ensured, and the service is guaranteed to be normal. DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作一简单地介绍， 显而易见地， 下 面描述中的附图是本发明的一些实施例， 对于本领域普通技术人员来讲， 在 不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。  In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.
图 1 为本发明提供的分组数据网络 PDN连接建立方法第一实施例的流程 图；  1 is a flow chart of a first embodiment of a method for establishing a PDN connection of a packet data network according to the present invention;
图 2为 3GPP网络中 PDN连接建立过程流程图；  2 is a flowchart of a PDN connection establishment process in a 3GPP network;
图 3为本发明提供的分组数据网络 PDN连接建立方法第二实施例的流程 图；  3 is a flow chart of a second embodiment of a method for establishing a PDN connection of a packet data network according to the present invention;
图 4为本发明提供的分组数据网络 PDN连接建立方法第三实施例的流程 图；  4 is a flow chart of a third embodiment of a method for establishing a PDN connection of a packet data network according to the present invention;
图 5为 non-3GPP网络中 PDN连接建立过程流程图；  5 is a flowchart of a PDN connection establishment process in a non-3GPP network;
图 6为本发明提供的分组数据网络 PDN连接建立方法第四实施例的流程 图；  6 is a flow chart of a fourth embodiment of a method for establishing a PDN connection of a packet data network according to the present invention;
图 7为本发明提供的分组数据网络 PDN连接建立方法第五实施例的流程 图；  7 is a flow chart of a fifth embodiment of a method for establishing a PDN connection of a packet data network according to the present invention;
图 8为本发明提供的分组数据网络网关第一实施例的结构示意图； 图 9为本发明提供的分组数据网络网关第二实施例的结构示意图。 具体实施方式 FIG. 8 is a schematic structural diagram of a first embodiment of a packet data network gateway according to the present invention; FIG. 9 is a schematic structural diagram of a second embodiment of a packet data network gateway according to the present invention. detailed description
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于 本发明中的实施例， 本领域普通技术人员在没有作出创造性劳动前提下所获 得的所有其他实施例， 都属于本发明保护的范围。  The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
图 1为本发明提供的分组数据网络 PDN连接建立方法第一实施例的流程 图， 如图 1所示， 该方法包括：  1 is a flow chart of a first embodiment of a PDN connection establishment method for a packet data network according to the present invention. As shown in FIG. 1, the method includes:
5101、 第一网关接收 PDN连接建立请求， 其中， 第一网关为归属用户 服务器中存储的第一分组数据网络网关信息对应的网关；  The first gateway is configured to receive a PDN connection establishment request, where the first gateway is a gateway corresponding to the first packet data network gateway information stored in the home user server;
5102、 第一网关获取第二分组数据网络网关信息， 以使第二网关与接入 网关网元或移动管理实体或服务网关建立 PDN连接， 该第二分组数据网络网 关信息与切换过程之前建立 PDN连接的第二网关相对应。  The first gateway acquires the second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information and the PDN are established before the handover process. The connected second gateway corresponds.
本发明实施例中涉及的切换过程可以是 UE从 3GPP接入网络切换至 non-3GPP接入网络的过程，还可以是 UE从 non-3GPP接入网络切换至 3GPP 接入网络的过程。  The handover process involved in the embodiment of the present invention may be a process in which the UE switches from the 3GPP access network to the non-3GPP access network, and may also be a process in which the UE switches from the non-3GPP access network to the 3GPP access network.
当 UE附着 3GPP接入网络或者 non-3GPP接入网络的过程中时， 会执行 缺省 PDN连接建立过程， 或者在附着到接入网络之后单独发起 PDN连接建立 流程， 在上述 PDN连接建立流程中， 3GPP接入网络中的移动管理实体 MME 或者非 3GPP接入网络中的分组数据网络网关 P-GW会向归属位置寄存器 ( Home Location Register; HLR ) /HSS发送通知请求， 要求 HLR/HSS记录 该 PDN连接对应的 P-GW信息，此时，如果出现网络异常情况，例如： HLR/HSS 发生拥塞的情况， 将导致 HLR/HSS无法处理上述通知请求， 而不会记录 PDN 连接对应的分组数据网络网关 P-G W信息， 也无法向移动管理实体 M M E或者 P-GW返回通知响应消息， 或者是 HLR/HSS向移动管理实体或者分组数据网 络网关 P-G W发送拒绝消息， 从而使移动管理实体或者分组数据网络网关 P-GW无法将 P-GW信息成功发送至 HLR/HSS中。 这种情况下， HLR/HSS中 保存的为已过时的 P-GW信息 （例如前一次 PDN连接建立过程成功保存的 P-GW信息） 。 When the UE is attached to the 3GPP access network or the non-3GPP access network, the default PDN connection establishment process is performed, or the PDN connection establishment process is separately initiated after being attached to the access network, in the PDN connection establishment process. The mobility management entity MME in the 3GPP access network or the packet data network gateway P-GW in the non-3GPP access network sends a notification request to the Home Location Register (HLR) /HSS, requesting the HLR/HSS to record the The PDN is connected to the corresponding P-GW information. In this case, if a network abnormality occurs, for example, the HLR/HSS is congested, the HLR/HSS cannot process the notification request, and the packet data network corresponding to the PDN connection is not recorded. The gateway PG W information cannot return a notification response message to the mobility management entity MME or the P-GW, or the HLR/HSS sends a reject message to the mobility management entity or the packet data network gateway PG W, thereby enabling the mobility management entity or the packet data network. Gateway The P-GW cannot successfully send the P-GW information to the HLR/HSS. In this case, the HLR/HSS stores the obsolete P-GW information (for example, the P-GW information successfully saved in the previous PDN connection establishment process).
其中， P-GW信息包括 P-GW标识（P-GW Identity ) , 具体可以是 P-GW 地址或者 P-GW的全称域名 ( Fully Qualified Domain Name; FQDN )等信息， 以及包括与该 PDN连接相关的接入点名称（Access Point Name; APN )等 信息， 还可以包括用户设备（User Equipment; UE )的标识信息， 例如： 国 际移动用户识别码 ( International Mobile Subscriber Identity, IMSI )或国际 移动设备标识 ( International Mobile Equipment Identity, IM曰）等。  The P-GW information includes a P-GW identity, which may be a P-GW address or a Fully Qualified Domain Name (FQDN) of the P-GW, and includes information related to the PDN connection. The information such as the access point name (APN) may also include the identification information of the user equipment (User Equipment; UE), for example, an International Mobile Subscriber Identity (IMSI) or an international mobile device identifier. (International Mobile Equipment Identity, IM曰), etc.
第一网关和第二网关均为分组数据网络网关 P-GW , 第一网关为 The first gateway and the second gateway are both a packet data network gateway P-GW, and the first gateway is
HLR/HSS中保存的已过时的 P-GW信息所指向的网关， 而第二网关为切换过 程之前， UE附着在 3GPP接入网络或者 non-3GPP接入网络时已建立 PDN连 接的网关， 即移动管理实体或者 PDN连接的分组数据网络网关 （第二网关） 本应发送给 HLR/HSS中的正确的 P-GW信息所指向的网关。 The gateway pointed to by the obsolete P-GW information stored in the HLR/HSS, and the second gateway is the gateway that has established the PDN connection when the UE attaches to the 3GPP access network or the non-3GPP access network before the handover process, that is, The mobile management entity or the PDN-connected packet data network gateway (second gateway) should be sent to the gateway pointed to by the correct P-GW information in the HLR/HSS.
具体的， 如果 UE从 3GPP接入网络切换至 non-3GPP接入网络， 则 non-3GPP接入网络中的接入网关网元（例如，演进的分组数据网关（ evolved Packet Data Gateway, ePDG ) ) , 从 HLR/HSS中获取存储的 P-GW信息， 并根据所述 P-GW信息所指向的第一网关， 向第一网关发起代理绑定更新消 息。 即， 这种情况下， S101中第一网关接收接入网关网元发送的代理绑定更 新消息（即分组数据网络 PDN连接建立请求）， 由于第一网关并非是 UE附着 在 3GPP接入网络中建立 PDN连接的实际网关， 因此， 第一网关需要获取第 二分组数据网络网关信息，以在接入网关网元与第二网关之间建立 PDN连接。 相应的， S103中， 第一网关可以直接向第二网关发起代理绑定更新消息来建 立接入网关网元到第二网关之间的 PDN连接； 或者， 第一网关也可以将第二 分组数据网络网关信息发送给接入网关网元， 以使接入网关网元向第二网关 发起代理绑定更新消息。 如果 UE从 non-3GPP接入网络切换至 3GPP接入网络， 则 3GPP接入网络 中的移动管理实体 MME, 从 HLR/HSS中获取存储的 P-GW信息， 并根据所述Specifically, if the UE switches from the 3GPP access network to the non-3GPP access network, the access gateway network element in the non-3GPP access network (for example, an evolved Packet Data Gateway (ePDG)) Obtaining the stored P-GW information from the HLR/HSS, and initiating a proxy binding update message to the first gateway according to the first gateway pointed to by the P-GW information. That is, in this case, the first gateway in S101 receives the proxy binding update message (ie, the packet data network PDN connection setup request) sent by the access gateway network element, because the first gateway is not the UE attached to the 3GPP access network. The actual gateway of the PDN connection is established. Therefore, the first gateway needs to obtain the second packet data network gateway information to establish a PDN connection between the access gateway network element and the second gateway. Correspondingly, in S103, the first gateway may directly initiate a proxy binding update message to the second gateway to establish a PDN connection between the access gateway network element and the second gateway; or the first gateway may also use the second packet data. The network gateway information is sent to the access gateway network element, so that the access gateway network element initiates a proxy binding update message to the second gateway. If the UE switches from the non-3GPP access network to the 3GPP access network, the mobility management entity MME in the 3GPP access network acquires the stored P-GW information from the HLR/HSS, and according to the
P-GW信息所指向的第一网关， 向第一网关发起建立会话请求。 即， 这种情 况下， S101中第一网关接收移动管理实体发送的建立会话请求（即分组数据 网络 PDN连接建立请求） ， 由于第一网关并非是 UE附着在 non-3GPP接入网 络中建立 PDN连接的实际网关， 因此， 第一网关需要获取第二分组数据网络 网关信息， 以建立移动管理实体到第二网关之间的 PDN连接。 相应的， S103 中， 第一网关可以直接向第二网关发起建立会话请求来建立移动管理实体到 第二网关的 PDN连接； 或者， 第一网关也可以将第二分组数据网络网关信息 发送给移动管理实体或者服务网关（Serving Gateway, S-GW ) , 以使移动 管理实体或者服务网关（ Serving Gateway, S-GW )向第二网关发起建立会 话请求。 The first gateway pointed to by the P-GW information initiates a session establishment request to the first gateway. That is, in this case, the first gateway in S101 receives the setup session request sent by the mobility management entity (ie, the packet data network PDN connection setup request), because the first gateway is not the UE attached to the non-3GPP access network to establish the PDN. The actual gateway connected, therefore, the first gateway needs to acquire the second packet data network gateway information to establish a PDN connection between the mobility management entity and the second gateway. Correspondingly, in S103, the first gateway may directly initiate a setup session request to the second gateway to establish a PDN connection of the mobility management entity to the second gateway; or the first gateway may also send the second packet data network gateway information to the mobile A management entity or a Serving Gateway (S-GW), so that the mobility management entity or the Serving Gateway (S-GW) initiates a session establishment request to the second gateway.
上述过程中， 第二分组数据网络网关信息可以保存在第一网关上， 或者 保存在策略与计费规则功能（ Policy and Charging Rules Function; PCRF ) 网元上。 则相应的， 第一网关可以在本地获取第二分组数据网络网关信息， 或者通过与 PCRF交互来获取第二分组数据网络网关信息。  In the foregoing process, the second packet data network gateway information may be saved on the first gateway or stored in a Policy and Charging Rules Function (PCRF) network element. Correspondingly, the first gateway may obtain the second packet data network gateway information locally, or acquire the second packet data network gateway information by interacting with the PCRF.
分组数据网络 PDN连接建立方法第一实施例中， 当归属用户服务器中存 储的 P-GW1信息对应的第一网关获取到 PDN连接建立请求后，根据预先存储 的 P-GW2信息建立接入网关网元或移动管理实体或服务网关到 P-GW2信息 对应的第二网关的 PDN连接。 保证 UE在 3GPP和非 3GPP之间切换流程的正 常执行， 保证业务正常进行。  In the first embodiment, after the first gateway corresponding to the P-GW1 information stored in the home subscriber server obtains the PDN connection establishment request, the access gateway network is established according to the pre-stored P-GW2 information. The PDN connection of the second gateway corresponding to the P-GW2 information by the UE or the mobility management entity or the serving gateway. Ensure that the UE performs normal handover procedures between 3GPP and non-3GPP to ensure normal services.
上一实施例中提及第二分组数据网络网关信息可以保存在第一网关上， 或者 PCRF上， 以下提供了在 3GPP网络 PDN连接建立过程中， 保存第二分组 数据网络网关信息的一种方法， 具体场景可以是 UE在附着过程中执行的缺省 PDN连接建立， 或者是单独的 PDN连接建立过程。 如图 2所示， 其中， 第一 网关以 P-GW1标识， 相应的， HLR/HSS中保存的为已过时的 P-GW1信息； 第二网关以 P-GW2标识， 相应的， 第二分组数据网络网关信息即为 P-GW2 信息。 The second packet data network gateway information mentioned in the previous embodiment may be stored on the first gateway, or on the PCRF. The following provides a method for saving the second packet data network gateway information in the 3GPP network PDN connection establishment process. The specific scenario may be a default PDN connection establishment performed by the UE during the attach process, or a separate PDN connection establishment process. As shown in FIG. 2, the first gateway is identified by P-GW1, and correspondingly, the P-GW1 information stored in the HLR/HSS is obsolete; The second gateway is identified by P-GW2, and correspondingly, the second packet data network gateway information is P-GW2 information.
该方法包括：  The method includes:
5201、 MME向 HLR/HSS发送通知请求（ Notify Request ) ；  5201. The MME sends a notification request (Notify Request) to the HLR/HSS.
由于在 UE附着过程中执行的缺省 PDN连接建立过程中，或者 PDN连接建 立流程中，如果出现网络异常情况，例如： HLR/HSS发生拥塞的情况，则 S201 将执行失败， MME无法接收 HLR/HSS返回的通知响应消息， 或者是 MME接 收到拒绝消息， 这种情况下， MME无法将 P-GW2信息携带在通知请求中发送 给 HLR/HSS。 即， HLR/HSS中保存的为已过时的 P-GW1信息。  In the default PDN connection establishment process performed during the UE attach procedure, or in the PDN connection establishment process, if a network abnormality occurs, for example, the HLR/HSS congestion occurs, S201 will fail to execute, and the MME cannot receive the HLR/ The notification response message returned by the HSS, or the MME receives the rejection message. In this case, the MME cannot carry the P-GW2 information in the notification request and send it to the HLR/HSS. That is, the P-GW1 information that has been obsolete is stored in the HLR/HSS.
其中 , P-GW2信息包括 P-GW2标识，具体可以是 P-GW2地址或者 P-GW2 的 FQDN等信息， 还可以包括与该 PDN连接相关的 APN等信息， 此外， 还可 以包括 UE的标识信息， 例如： 国际移动用户识别码（IMSI )或国际移动设备 标识（IM曰）等。  The P-GW2 information includes the P-GW2 identifier, and may be information such as the P-GW2 address or the FQDN of the P-GW2, and may also include information such as the APN related to the PDN connection, and may further include the identifier information of the UE. For example: International Mobile Subscriber Identity (IMSI) or International Mobile Equipment Identity (IM曰).
则一种可行的实施方式为： 将 P-GW2信息保存至 PCRF上， 具体包括 S202-S205:  A feasible implementation manner is as follows: The P-GW2 information is saved to the PCRF, and specifically includes S202-S205:
5202、 MME通过 S-GW向 P-GW2发送修改承载请求消息（ Modify Bearer Request ) ， 该修改承载请求消息中携带保存 P-GW信息的指示信息；  5202. The MME sends a modify bearer request message to the P-GW2 by using the S-GW, where the modify bearer request message carries the indication information for saving the P-GW information.
在 S202中， 如果 S-GW和 P-GW之间采用 GPRS隧道协议 （ GPRS Tunnelling Protocol; GTP ) , 则 S-GW向 P-GW2发送上述携带 "保存 P-GW 信息" 的指示信息的修改承载请求消息 （ Modify Bearer Request ) ；  In S202, if the GPRS Tunneling Protocol (GTP) is used between the S-GW and the P-GW, the S-GW sends the modified bearer carrying the indication information of "save P-GW information" to the P-GW2. Request Message ( Modify Bearer Request ) ;
如果 S-GW和 P-GW之间采用 PMIP协议时， 则 S-GW向 P-GW2发送携带 "保存 P-GW信息"的指示信息的代理绑定更新消息（ Proxy Binding Update; PBU ) 。  If the PMIP protocol is adopted between the S-GW and the P-GW, the S-GW sends a Proxy Binding Update (PBU) carrying the indication information of "save P-GW information" to the P-GW2.
5203、 P-GW2向 PCRF发送会话修改请求 （IP-CAN Session Modify Request ) 消息。  5203. The P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
P-GW2根据收到的 "保存 P-GW信息" 的指示信息， 将 P-GW2信息（例 如： P-GW2标识或者 P-GW2地址， 和 /或接入点名称（APN ) , 和 /或 UE的标 识信息 （IMSI或 IM曰等） 等信息） 包括在会话修改请求消息中发送给 PCRF 进行保存。 P-GW2 will P-GW2 information according to the received indication information of "save P-GW information" (example For example, the P-GW2 identifier or the P-GW2 address, and/or the access point name (APN), and/or the identification information of the UE (IMSI or IM曰, etc.) are included in the session modification request message and sent to the PCRF. Save it.
S204、 PCRF向 P-GW2发送会话修改响应 （IP-CAN Session Modify Ack ) 消息。  S204. The PCRF sends an IP-CAN Session Modify Ack message to the P-GW2.
S205、 P-GW2向 S-GW发送建立会话响应消息 （ Create Session Response )或者代理绑定确认消息（ Proxy Binding Ack, PBA ) , S-GW向 MME发送建立会话响应消息 ( Create Session Response ) 。  S205. The P-GW2 sends a Create Session Response message or a Proxy Binding Ack (PBA) to the S-GW, and the S-GW sends a Create Session Response message to the MME.
与 S202至 S205并列的另一种可行的实施方式为： 将 P-GW2信息保存至 P-GW1上， 具体包括 S206和 S207:  Another feasible implementation manner along with S202 to S205 is: saving the P-GW2 information to the P-GW1, specifically including S206 and S207:
5206、 MME通过 S-GW向 P-GW1发送通知请求消息，该通知请求消息中 携带 P-GW2信息 （例如： P-GW2标识或者 P-GW2地址， 和 /或接入点名称 S206: The MME sends a notification request message to the P-GW1 through the S-GW, where the notification request message carries P-GW2 information (for example: P-GW2 identifier or P-GW2 address, and/or access point name
( APN ) , 和 /或 UE的标识信息 （IMSI或 IM曰等）等信息） 。 (APN), and/or information such as identification information (IMSI or IM曰, etc.) of the UE).
S206中， 如果 S-GW和 P-GW之间采用 GTP协议， 则 S-GW向 P-GW1发 送上述携带 P-G W2信息的通知请求消息；  In S206, if the GTP protocol is adopted between the S-GW and the P-GW, the S-GW sends the foregoing notification request message carrying the P-G W2 information to the P-GW1;
如果 S-GW和 P-GW之间采用 PMIP协议时 , S-GW向 P-GW1发送携带 P-GW2信息的 PBU。  If the PMIP protocol is adopted between the S-GW and the P-GW, the S-GW sends a PBU carrying the P-GW2 information to the P-GW1.
P-GW1收到上述通知请求消息后， 将 P-GW2信息保存在 P-GW1上。 After receiving the above notification request message, the P-GW1 saves the P-GW2 information on the P-GW1.
5207、 P-GW1向 S-GW发送通知响应消息或者 PBA, S-GW向 MME发送 通知响应消息。 5207. The P-GW1 sends a notification response message or a PBA to the S-GW, and the S-GW sends a notification response message to the MME.
以上仅为在 3GPP接入网络 PDN连接建立过程中， 保存第二分组数据网 络网关信息的一种较佳的实施方式，但并不以此作为对本发明实施例的限制。 由于在 3GPP网络 PDN连接建立过程中， 第二分组数据网络网关信息 （即 P-GW2信息）可以保存在 PCRF上， 或者是保存在第一网关 P-GW1本地， 因 此， 在从 3GPP接入网络切换到 non-3GPP接入网络的过程中， 第一网关 P-GW1能够从 P-GW1本地， 或者从 PCRF上获取预先存储的第二分组数据网 络网关信息 , 从而建立接入网关网元到第二网关之间的 PDN连接。 图 3为本发明提供的分组数据网络 PDN连接建立方法第二实施例的流程 图， 如图 3所示， 本实施例提供了 UE从 3GPP接入网络切换到 non-3GPP接入 网络过程中， UE执行切换附着（handover attach )流程的场景。该方法包括： S301、 UE向 non-3GPP接入网络发起鉴权认证处理。 The foregoing is only a preferred embodiment for storing the second packet data network gateway information in the process of establishing a PDN connection in the 3GPP access network, but is not limited thereto. Since the second packet data network gateway information (ie, P-GW2 information) may be stored in the PCRF or stored in the first gateway P-GW1 in the 3GPP network PDN connection establishment process, therefore, in the slave 3GPP access network In the process of switching to the non-3GPP access network, the first gateway P-GW1 can acquire the pre-stored second packet data network locally from the P-GW1 or from the PCRF. The gateway information is established, thereby establishing a PDN connection between the access gateway network element and the second gateway. FIG. 3 is a flowchart of a second embodiment of a PDN connection establishment method for a packet data network according to the present invention. As shown in FIG. 3, this embodiment provides a process for a UE to switch from a 3GPP access network to a non-3GPP access network. The UE performs a scenario of a handover attach process. The method includes: S301: A UE initiates an authentication authentication process to a non-3GPP access network.
其中，与 UE交互的 non-3GPP接入网关网元，具体可以是 ePDG或者 MAG 等网络实体。  The non-3GPP access gateway network element that interacts with the UE may be a network entity such as an ePDG or an MAG.
S302、 non-3GPP接入网关网元执行到 HSS/AAA Server的鉴权认证流 程。  S302. The non-3GPP access gateway network element performs an authentication and authentication process to the HSS/AAA server.
HSS/认证、 授权和计费月良务器（Authentication, Authorization and HSS/Authentication, Authorization and Accounting (Authentication, Authorization and
Accounting Server; AAA Server)向 non-3GPP接入网关网元提供在切换过程 之前存储的 U E的 PDN连接相关信息， 即 P-GW1信息。 The Accounting Server; AAA Server) provides the non-3GPP access gateway network element with the PDN connection related information of the U E stored before the handover process, that is, the P-GW1 information.
其中， P-GW1信息可以包括 P-GW标识或者 P-GW地址， 还可以包括 APN , 此外， 还可以包括 UE的标识信息 （如 IMSI , IM曰等）等信息。  The P-GW1 information may include a P-GW identifier or a P-GW address, and may also include an APN. In addition, the P-GW1 information may further include information such as identity information (such as IMSI, IM曰, etc.) of the UE.
S303、 UE发送附着请求消息 （该步骤为可选步骤） 。  S303. The UE sends an attach request message (this step is an optional step).
S304、 non-3GPP接入网关网元向 P-GW1发送 PBU消息（即分组数据网 络 PDN连接建立请求） ， 该 PBU消息中携带 "切换附着" 指示。  S304: The non-3GPP access gateway network element sends a PBU message (that is, a packet data network PDN connection establishment request) to the P-GW1, where the PBU message carries a “handover attachment” indication.
如果 P-GW1本地已保存 P-GW2的信息， 直接执行 S307; 如果 P-GW1本 地不存在 P-GW2的信息， 则首先执行 S305和 S306, 再执行 S307。  If P-GW1 has locally saved the information of P-GW2, S307 is directly executed; if P-GW1 does not have the information of P-GW2 locally, S305 and S306 are executed first, and then S307 is executed.
S305、 P-GW1向 PCRF发送会话建立请求消息（ IP-CAN Session Create S305. The P-GW1 sends a session establishment request message to the PCRF (IP-CAN Session Create).
Request ) , 该会话建立请求消息中携带指示信息， 所述指示信息用于指示 获取 P-GW2信息； The session establishment request message carries the indication information, where the indication information is used to indicate that the P-GW2 information is obtained;
P-GW1收到代理绑定更新消息后， 根据 "切换附着" 指示， 向 PCRF发 送会话建立请求消息， 该消息中携带 UE标识（IMSI ) 、 UE当前的接入网类 型 （RAT Type ) 、 该 PDN连接对应的接入点名称（APN ) , 此外， 该消息中 还包括指示信息， 用以指示获取 P-GW2信息。 5306、 PCRF根据收到的会话建立请求消息判断 P-GW1需要获取 P-GW2 信息， 则向 P-GW1发送会话建立响应消息 （IP-CAN Session Create Ack ) , 该会话建立响应消息中携带 P-GW2信息。 After receiving the proxy binding update message, the P-GW1 sends a session establishment request message to the PCRF according to the "handover attachment" indication, where the message carries the UE identity (IMSI), the current access network type (RAT Type) of the UE, and the The PDN is connected to the corresponding access point name (APN). In addition, the message further includes indication information for indicating that the P-GW2 information is obtained. 5306. The PCRF determines, according to the received session establishment request message, that the P-GW1 needs to obtain the P-GW2 information, and sends a session establishment response message (IP-CAN Session Create Ack) to the P-GW1, where the session establishment response message carries the P- GW2 information.
第一网关 P-GW1获取 PCRF发送的 P-GW2信息后， 触发接入网关网元与 第二网关建立 PDN连接。本实施例中提供的方式为 P-GW1将 P-GW2信息发送 给接入网关网元， 由接入网关网元向 P-GW2发起 PDN连接建立请求， S307 和 S308。  After acquiring the P-GW2 information sent by the PCRF, the first gateway P-GW1 triggers the access gateway network element to establish a PDN connection with the second gateway. The method provided in this embodiment is that the P-GW1 sends the P-GW2 information to the access gateway network element, and the access gateway network element initiates a PDN connection establishment request to the P-GW2, S307 and S308.
5307、 P-GW1向 non-3GPP接入网关网元发送 PBA消息， 该 PBA消息中 携带 P-GW2信息。  5307. The P-GW1 sends a PBA message to the non-3GPP access gateway network element, where the PBA message carries the P-GW2 information.
S308、 non-3GPP接入网关网元根据接收的 P-GW2信息， 向 P-GW2发送 代理绑定更新 PBU消息 (即 PDN连接建立请求消息 )。该 PBU消息中携带 "切 换附着" 指示。 该 PBU消息中还可以携带 "更新 P-GW信息" 的指示信息。  S308. The non-3GPP access gateway network element sends a proxy binding update PBU message (ie, a PDN connection establishment request message) to the P-GW2 according to the received P-GW2 information. The PBU message carries a "switching attachment" indication. The PBU message may also carry the indication information of "update P-GW information".
S309、 P-GW2向 PCRF发送会话修改请求 （IP-CAN Session Modify Request ) 消息。  S309. The P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
S310、 PCRF向 P-GW2发送会话修改响应 （IP-CAN Session Modify S310, PCRF sends a session modification response to P-GW2 (IP-CAN Session Modify
Ack )消息，消息中携带策略与计费控制（ Policy and Charging Control; PCC ) 规则。 Ack) A message carrying a Policy and Charging Control (PCC) rule.
S31 1、 P-GW2向 non-3GPP接入网关网元发送 PBA消息。  S31 1. The P-GW2 sends a PBA message to the non-3GPP access gateway network element.
S312、 non-3GPP接入网关网元向 UE发送附着接受消息。  S312. The non-3GPP access gateway network element sends an attach accept message to the UE.
S313、 P-GW2根据 S308中收到的 "更新 P-GW信息"的指示信息或者根 据自身策略， 向 HSS/AAA发送通知请求（Notify Request ) 消息， 该通知请 求消息中携带 P-G W2信息。  S313. The P-GW2 sends a notification request (Notify Request) message to the HSS/AAA according to the indication information of the "update P-GW information" received in S308 or according to its own policy, and the notification request message carries the P-G W2 information.
S314、 HSS/AAA保存 P-GW2信息， 并向 P-GW2发送通知响应消息 ( Notify Response ) 。  S314. The HSS/AAA saves the P-GW2 information, and sends a notification response message (Notify Response) to the P-GW2.
其中， S313和 S312之间没有先后关系， S313也可以在 S31 1之后执行。 图 4为本发明提供的分组数据网络 PDN连接建立方法第三实施例的流程 图， 如图 4所示， 与前一实施例相同的是， 本实施例也提供了 UE从 3GPP接入 网络切换到 non-3GPP接入网络过程中， UE执行切换附着（ handover attach ) 流程的场景， 与前一实施例的区别在于， 前一实施例中 P-GW1获取 PCRF发 送的 P-G W2信息或者根据本地存储的信息获取 P-G W2信息后， P-GW 1将 P-GW2信息发送给接入网关网元，由接入网关网元向 P-GW2发起 PDN连接建 立请求； 而本实施例中， P-GW1获取 PCRF发送的 P-GW2信息后， 直接向 P-GW2发起 PDN连接建立请求， 即执行 S407。 该方法包括： There is no sequence relationship between S313 and S312, and S313 can also be executed after S31 1. 4 is a flowchart of a third embodiment of a method for establishing a PDN connection of a packet data network according to the present invention As shown in FIG. 4, the same as the previous embodiment, the embodiment also provides a process for the UE to perform a handover attach process in the process of the UE switching from the 3GPP access network to the non-3GPP access network. The scenario is different from the previous embodiment in that, in the previous embodiment, after the P-GW1 acquires the PG W2 information sent by the PCRF or obtains the PG W2 information according to the locally stored information, the P-GW 1 sends the P-GW2 information to the connection. In the gateway network element, the access gateway network element initiates a PDN connection establishment request to the P-GW2. In this embodiment, after acquiring the P-GW2 information sent by the PCRF, the P-GW1 directly initiates a PDN connection establishment request to the P-GW2. , that is, execute S407. The method includes:
S401~S406的过程和 S301~S306的过程相同， 可参见前一实施例， 不再 赘述。  The process of S401~S406 is the same as the process of S301~S306, and can be referred to the previous embodiment, and will not be described again.
S407、 P-GW1向 P-GW2转发 PBU消息，该消息中包括 non-3GPP接入网 关网元的地址信息和 "切换附着" 指示。  S407. The P-GW1 forwards the PBU message to the P-GW2, where the message includes the address information of the non-3GPP access gateway network element and the "handover attachment" indication.
上述消息中还可以携带 "更新 P-GW信息" 的指示信息。  The above message may also carry the indication information of "update P-GW information".
S408、 P-GW2向 PCRF发送会话修改请求 （IP-CAN Session Modify S408. The P-GW2 sends a session modification request to the PCRF. (IP-CAN Session Modify
Request ) 消息。 Request ) Message.
S409、 PCRF向 P-GW2发送会话修改响应 （IP-CAN Session Modify S409. The PCRF sends a session modification response to the P-GW2 (IP-CAN Session Modify).
Ack ) 消息， 消息中携带 PCC规则。 Ack) message, the message carries the PCC rule.
S410、 P-GW2向 non-3GPP接入网关网元发送 PBA消息。  S410. The P-GW2 sends a PBA message to the non-3GPP access gateway network element.
S41 1、 non-3GPP接入网关网元向 U E发送附着接受消息。  S41 1. The non-3GPP access gateway network element sends an attach accept message to the U E.
5412、 P-GW2根据 "更新 P-GW信息" 的指示信息或者自身策略， 向 HSS/AAA发送通知请求 （ Notify Request ) 消息， 该通知请求消息中携带 5412. The P-GW2 sends a notification request (Notify Request) message to the HSS/AAA according to the indication information of the “update P-GW information” or the self-policy, and the notification request message carries
P-GW2信息。 P-GW2 information.
5413、 HSS/AAA保存 P-GW2信息， 并向 P-GW2发送通知响应消息 ( Notify Response ) 。  5413. The HSS/AAA saves the P-GW2 information and sends a notification response message (Notify Response) to the P-GW2.
图 2-图 4描述了在 3GPP网络 PDN连接建立过程中， 保存第二分组数据网 络网关信息的一种方法， 以及从 3GPP接入网络切换至 non-3GPP接入网络的 PDN连接建立过程。 以下将描述在 non-3GPP网络 PDN连接建立过程中， 保存第二分组数据 网络网关信息的一种方法， 以及从 non-3GPP接入网络切换至 3GPP接入网络 的 PDN连接建立过程。 2 to 4 illustrate a method of storing second packet data network gateway information during a 3GPP network PDN connection establishment process, and a PDN connection establishment procedure for handover from a 3GPP access network to a non-3GPP access network. A method of saving the second packet data network gateway information during the non-3GPP network PDN connection establishment process, and a PDN connection establishment procedure for switching from the non-3GPP access network to the 3GPP access network will be described below.
其中， 在 non-3GPP网络 PDN连接建立过程中， 保存第二分组数据网络 网关信息的一种方法，具体场景可以是 UE在附着过程中执行的缺省 PDN连接 建立，或者是单独的 PDN连接建立过程。如图 5所示，其中，第一网关以 P-GW1 标识， 相应的， HLR/HSS中保存的是已过时的 P-GW1信息； 第二网关以 P-GW2标识， 相应的， 第二分组数据网络网关信息即为 P-GW2信息。  A method for saving the second packet data network gateway information in the non-3GPP network PDN connection establishment process, where the specific scenario may be the default PDN connection establishment performed by the UE during the attach process, or a separate PDN connection establishment. process. As shown in FIG. 5, wherein the first gateway is identified by P-GW1, correspondingly, the HLR/HSS stores the obsolete P-GW1 information; the second gateway is identified by P-GW2, and correspondingly, the second group The data network gateway information is the P-GW2 information.
该方法包括：  The method includes:
S501、 P-GW2向 HSS/AAA发送通知请求（ Notify Request ) 。  S501 and P-GW2 send a notification request (Notify Request) to the HSS/AAA.
由于在 UE附着过程中执行的缺省 PDN连接建立过程中，或者 PDN连接建 立流程中， 如果出现网络异常情况， 例如： HSS/AAA发生拥塞的情况下， 则 将导致 S501执行失败， 例如： P-GW2没有收到 "通知响应" 消息， 或者收到 了拒绝消息，从而使 P-GW2无法将 P-GW2信息携带在通知请求消息中发送给 HSS/AAA。  If the network abnormality occurs during the default PDN connection establishment process or the PDN connection establishment process, for example, if the HSS/AAA is congested, the S501 execution fails. For example: P - GW2 does not receive the "Notification Response" message, or receives the rejection message, so that P-GW2 cannot carry the P-GW2 information in the notification request message and send it to the HSS/AAA.
一种可行的实施方式为： 将 P-GW2信息保存至 PCRF上， 具体包括 S502 和 S503:  A feasible implementation manner is as follows: The P-GW2 information is saved to the PCRF, and specifically includes S502 and S503:
5502、 P-GW2向 PCRF发送会话修改请求 （IP-CAN Session Modify Request ) 消息。  5502. The P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
P-GW2将 P-GW2信息携带在会话修改请求消息中发送给 PCRF进行保 存。  The P-GW2 carries the P-GW2 information in the session modification request message and sends it to the PCRF for storage.
5503、 PCRF向 P-GW2发送会话修改响应 （IP-CAN Session Modify Ack ) 消息。  5503. The PCRF sends an IP-CAN Session Modify Ack message to the P-GW2.
与 S502-S503并列的另一种可行的实施方式为： 将 P-GW2信息保存至 P-GW1上， 具体包括 S504至 S507:  Another feasible implementation manner along with S502-S503 is: saving the P-GW2 information to the P-GW1, specifically including S504 to S507:
5504、 P-GW2向 non-3GPP接入网关网元发送通知请求消息， 该通知请 求消息中携带 "更新 P-GW信息" 的指示信息。 5504. The P-GW2 sends a notification request message to the non-3GPP access gateway network element, where the notification is requested. The message carries the indication information of "update P-GW information".
5505、 non-3GPP接入网关网元向 P-GW1发送通知请求消息， 该通知请 求消息中携带 P-GW2信息，所述 P-GW2信息包括 P-GW2标识或 P-GW2地址， 还可以包括该 PDN连接对应的 APN以及该用户的标识信息（例如 IMSI或 IM曰 等） 。  5505. The non-3GPP access gateway network element sends a notification request message to the P-GW1, where the notification request message carries P-GW2 information, where the P-GW2 information includes a P-GW2 identifier or a P-GW2 address, and may also include The PDN is connected to the corresponding APN and the identification information of the user (for example, IMSI or IM曰, etc.).
P-GW1收到上述消息后，保存该用户（IMSI或 IM曰）所述 APN的 P-GW2 信息。  After receiving the above message, the P-GW1 saves the P-GW2 information of the APN of the user (IMSI or IM曰).
5506、 P-GW1向 non-3GPP接入网关网元发送通知响应消息。  5506. The P-GW1 sends a notification response message to the non-3GPP access gateway network element.
5507、 non-3GPP接入网关网元向 P-GW2发送通知响应消息。  5507. The non-3GPP access gateway network element sends a notification response message to the P-GW2.
以上仅为在 non-3GPP接入网络 PDN连接建立过程中， 保存第二分组数 据网络网关信息的一种较佳的实施方式， 但并不以此作为对本发明实施例的 限制。 由于在 non-3GPP网络 PDN连接建立过程中， 第二分组数据网络网关 信息即为 P-GW2信息可以保存在 PCRF上， 或者是保存在第一网关 P-GW1本 地， 因此， 在从 non-3GPP接入网络切换到 3GPP接入网络的过程中， 第一网 关 P-GW1能够从 P-GW1本地， 或者从 PCRF上获取预先存储的第二分组数据 网络网关信息， 从而建立服务网关 （S-GW )或移动管理实体到第二网关的 PDN连接。  The above is only a preferred embodiment for storing the information of the second packet data network gateway in the process of establishing the PDN connection of the non-3GPP access network, but it is not intended to limit the embodiment of the present invention. Since the second packet data network gateway information is the P-GW2 information in the non-3GPP network PDN connection establishment process, the information may be stored on the PCRF or stored locally in the first gateway P-GW1, and therefore, in the non-3GPP During the process of the access network switching to the 3GPP access network, the first gateway P-GW1 can obtain the pre-stored second packet data network gateway information locally from the P-GW1 or from the PCRF, thereby establishing a serving gateway (S-GW). Or a PDN connection from the mobility management entity to the second gateway.
图 6为本发明提供的分组数据网络 PDN连接建立方法第四实施例的流程 图， 如图 6所示， 本实施例提供了 UE从 non-3GPP接入网络切换到 3GPP接入 网络过程中， UE执行切换附着（ handover attach )流程的场景。该方法包括： FIG. 6 is a flowchart of a fourth embodiment of a PDN connection establishment method for a packet data network according to the present invention. As shown in FIG. 6, the embodiment provides a process for a UE to switch from a non-3GPP access network to a 3GPP access network. The UE performs a scenario of a handover attach process. The method includes:
5601、 UE向 MME发送附着请求消息 ( Attach Request ) , 附着类型为 "切换附着 （Handover Attach ) " 。 5601. The UE sends an attach request message ( Attach Request) to the MME, and the attach type is “Handover Attach”.
5602、 MME向 HLR/HSS发送更新位置请求消息 （ Update Location Request ) 。  5602. The MME sends an update location request message (Update Location Request) to the HLR/HSS.
S603、 HLR/HSS向 MME发送更新位置响应消息 （ Update Location S603, the HLR/HSS sends an update location response message to the MME (Update Location
Ack ) , 该更新位置响应消息中携带切换过程之前存储的 UE的 PDN连接相关 信息， 即 P-GW1信息。 其中， P-GW1信息包括 P-GW标识或者 P-GW地址， 还可以包括 APN, 此外还可以包括 UE的标识信息 （如 IMSI或 IM曰）等信息。 Ack), the update location response message carries the PDN connection related to the UE stored before the handover procedure Information, ie P-GW1 information. The P-GW1 information includes a P-GW identifier or a P-GW address, and may further include an APN, and may further include information such as identifier information (such as IMSI or IM曰) of the UE.
5604、 MME根据 "切换附着" 指示， 以及 HLR/HSS提供的 P-GW1信息 选择 S-GW和 P-GW1 , 向 S-GW发送建立会话请求消息 （Create Session Request ) , 消息中携带 "切换附着" 指示。  5604. The MME selects the S-GW and the P-GW1 according to the "Handover Attachment" indication and the P-GW1 information provided by the HLR/HSS, and sends a Create Session Request message to the S-GW, where the message carries the "Handover Attachment". "Instructions.
如果 S-GW和 P-GW之间采用 GTP协议，则 S-GW向 P-GW1发送上述携带 "切换附着" 指示的会话请求消息 （ Create Session Request ) ；  If the GTP protocol is adopted between the S-GW and the P-GW, the S-GW sends the above-mentioned session request message (Create Session Request) carrying the "handover attachment" indication to the P-GW1;
如果 S-GW和 P-GW之间采用 PMIP协议，则 S-GW向 P-GW1发送携带 "切 换附着" 指示的 PBU消息。  If the PMIP protocol is adopted between the S-GW and the P-GW, the S-GW sends a PBU message carrying the "Switch Attach" indication to the P-GW1.
如果 P-GW1本地已保存 P-GW2的信息， 则可以直接执行 S607; 如果 If P-GW1 has saved the information of P-GW2 locally, you can directly execute S607;
P-GW1本地不存在 P-GW2信息， 则首先执行 S605和 S606, 再执行 S607。 If P-GW1 does not exist locally in P-GW1, S605 and S606 are executed first, and then S607 is executed.
5605、 P-GW1向 PCRF发送会话建立请求消息（ IP-CAN Session Create Request ) , 该会话建立请求消息中携带指示信息， 所述指示信息用于指示 获取 P-GW2信息；  5605. The P-GW1 sends a session establishment request message (IP-CAN Session Create Request) to the PCRF, where the session establishment request message carries the indication information, where the indication information is used to indicate that the P-GW2 information is obtained.
S606、 PCRF根据收到的会话建立请求消息判断 P-GW1需要获取 P-GW2 信息， 则向 P-GW1发送会话建立响应消息 （IP-CAN Session Create Ack ) , 该会话建立响应消息中携带 P-GW2信息。  S606. The PCRF determines, according to the received session establishment request message, that the P-GW1 needs to obtain the P-GW2 information, and sends a session establishment response message (IP-CAN Session Create Ack) to the P-GW1, where the session establishment response message carries the P- GW2 information.
P-GW1获取 PCRF发送的 P-GW2信息后， 触发服务网关 （ S-GW )或移 动管理实体与第二网关建立 PDN连接。 本实施例中提供的方式为 P-GW1将 P-GW2信息发送给服务网关 （S-GW ) 或者移动管理实体， 由服务网关 ( S-GW ) 或者移动管理实体向 P-GW2发起 PDN连接建立请求， S607和 S608。  After the P-GW1 obtains the P-GW2 information sent by the PCRF, the trigger service gateway (S-GW) or the mobile management entity establishes a PDN connection with the second gateway. The manner provided in this embodiment is that the P-GW1 sends the P-GW2 information to the serving gateway (S-GW) or the mobility management entity, and the serving gateway (S-GW) or the mobility management entity initiates the PDN connection establishment to the P-GW2. Request, S607 and S608.
S607、 P-GW1向 S-GW发送建立会话响应消息 （ Create Session Response )或者建立会话拒绝消息（ Create Session Reject ) ； 或者 PBA, 该消息中携带 P-G W2信息。  S607. The P-GW1 sends a Create Session Response message or a Create Session Reject message to the S-GW, or a PBA, where the message carries the P-G W2 information.
所述 S-GW可以直接执行 S608, 建立到 P-GW2的 PDN连接； 也可以向移 动管理实体转发携带 P-G W2信息的建立会话响应消息或者建立会话拒绝消 息， 所述移动管理实体根据收到的 P-GW2信息选择新的服务网关 S-GW (该 新的服务网关也可能和上述转发消息的服务网关为同一网元） ， 并向该新的 服务网关 S-GW发送建立会话请求消息， 以建立到 P-GW2的 PDN连接， 该建 立会话请求消息中携带 "切换附着" 指示和 P-GW2信息。 The S-GW may directly execute S608, establish a PDN connection to the P-GW2, or move to the P-GW2. The mobile management entity forwards a setup session response message carrying the PG W2 information or establishes a session rejection message, and the mobility management entity selects a new service gateway S-GW according to the received P-GW2 information (the new service gateway may also be the same as the above The service gateway that forwards the message is the same network element, and sends a setup session request message to the new serving gateway S-GW to establish a PDN connection to the P-GW2, where the setup session request message carries a "handover attachment" indication and P-GW2 information.
5608、 S-GW根据 S607中从 P-GW1或者 MME接收到的 P-GW2信息， 向 P-GW2发送建立会话请求消息 （ Create Session Request ) 消息。 该消息中 携带 "切换附着" 指示。  S608: The S-GW sends a Create Session Request message to the P-GW2 according to the P-GW2 information received from the P-GW1 or the MME in S607. The message carries the "switch attachment" indication.
如果 S-GW和 P-GW之间采用 GTP协议，则 S-GW向 P-GW2发送上述携带 "切换附着" 指示的会话请求消息 ( Create Session Request ) ；  If the GTP protocol is adopted between the S-GW and the P-GW, the S-GW sends the above-mentioned session request message (Create Session Request) carrying the "handover attachment" indication to the P-GW2;
如果 S-GW和 P-GW之间采用 PMIP协议，则 S-GW向 P-GW2发送携带 "切 换附着" 指示的代理绑定更新消息 （Proxy Binding Update, PBU ) 。  If the PMIP protocol is adopted between the S-GW and the P-GW, the S-GW sends a Proxy Binding Update (PBU) carrying the "Switch Attach" indication to the P-GW2.
5609、 P-GW2向 PCRF发送会话修改请求 （IP-CAN Session Modify Request ) 消息。  5609. The P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
S610、 PCRF向 P-GW2发送会话修改响应 （IP-CAN Session Modify S610, PCRF sends a session modification response to P-GW2 (IP-CAN Session Modify
Ack ) 消息， 消息中携带 PCC规则。 Ack) message, the message carries the PCC rule.
S61 1 、 P-GW2向 S-GW发送建立会话响应消息 （ Create Session S61 1 and P-GW2 send a session establishment response message to the S-GW (Create Session
Response )或者 PBA消息， S-GW向 MME发送建立会话响应消息 （CreateResponse ) or PBA message, the S-GW sends a setup session response message to the MME (Create
Session Response ) , 该消息中可以携带 P-GW2信息。 Session Response ) , the message can carry P-GW2 information.
S612、 MME向 UE发送附着接受消息。  S612. The MME sends an attach accept message to the UE.
5613、 MME根据 S607或者 S611中接收到的 P-GW2信息， 向 HLR/HSS 发送通知请求（Notify Request ) 消息， 消息中携带 P-GW2信息。  5613. The MME sends a notification request (Notify Request) message to the HLR/HSS according to the P-GW2 information received in S607 or S611, where the message carries the P-GW2 information.
5614、 HLR/HSS记录 P-GW2信息， 向 MME发送通知响应消息 （ Notify Response ) 。  5614. The HLR/HSS records the P-GW2 information, and sends a notification response message (Notify Response) to the MME.
其中， S612和 613之间没有先后关系， 也可以并行执行。  There is no order relationship between S612 and 613, and it can also be executed in parallel.
图 7为本发明提供的分组数据网络 PDN连接建立方法第五实施例的流程 图， 如图 7所示， 与前一实施例相同的是， 本实施例也提供了 UE从 non-3GPP 接入网络切换到 3GPP接入网络过程中， UE执行切换附着（ handover attach ) 流程的场景， 与前一实施例的区别在于， 前一实施例中 P-GW1获取 PCRF发 送的 P-GW2信息或者获取自身保存的 P-GW2信息后， P-GW1将 P-GW2信息 发送给服务网关或者移动管理实体， 由服务网关或者移动管理实体向 P-GW2 发起 PDN连接建立请求； 而本实施例中， P-GW1获取 PCRF发送的 P-GW2信 息或者获取自身保存的 P-GW2信息后， 直接向 P-GW2发起 PDN连接建立请 求， 即执行 S707。 该方法包括： FIG. 7 is a flowchart of a fifth embodiment of a method for establishing a PDN connection of a packet data network according to the present invention As shown in FIG. 7, the same as the previous embodiment, this embodiment also provides a process for the UE to perform a handover attach process in the process of the UE switching from the non-3GPP access network to the 3GPP access network. The scenario is different from the previous embodiment in that, in the previous embodiment, after the P-GW1 acquires the P-GW2 information sent by the PCRF or obtains the P-GW2 information saved by itself, the P-GW1 sends the P-GW2 information to the serving gateway. Or the mobile management entity, the P2W2 initiates a PDN connection establishment request by the serving gateway or the mobility management entity; in this embodiment, after the P-GW1 obtains the P-GW2 information sent by the PCRF or obtains the P-GW2 information saved by itself, The PDN connection establishment request is directly initiated to the P-GW2, that is, S707 is performed. The method includes:
S701~S706的过程和 S601~S606的过程相同， 可参见前一实施例， 不再 赘述。  The process of S701~S706 is the same as the process of S601~S606, and can be referred to the previous embodiment, and will not be described again.
5707、 P-GW1向 P-GW2转发建立会话请求消息 （ Create Session Request )消息或者 PBU消息，该消息中包括 S-GW的地址信息、 "切换附着" 指示。  5707. The P-GW1 forwards a Create Session Request message or a PBU message to the P-GW2, where the message includes an address information of the S-GW and a “Handover Attachment” indication.
5708、 P-GW2向 PCRF发送会话修改请求 （IP-CAN Session Modify Request ) 消息。  5708. The P-GW2 sends an IP-CAN Session Modify Request message to the PCRF.
5709、 PCRF向 P-GW2发送会话修改响应 （IP-CAN Session Modify Ack ) 消息， 消息中携带 PCC规则。  5709. The PCRF sends an IP-CAN Session Modify Ack message to the P-GW2, where the message carries the PCC rule.
5710、 P-GW2向 S-GW发送建立会话响应消息 （ Create Session Response )或者 PBA消息， 该消息中携带 P-GW2信息， S-GW向 MME转发 该建立会话响应消息 （ Create Session Response ) 。  5710. The P-GW2 sends a Create Session Response message or a PBA message to the S-GW, where the message carries the P-GW2 information, and the S-GW forwards the Create Session Response message to the MME.
S71 1 ~S713的过程和 S612~S614的过程相同， 不再赘述。  The process of S71 1 ~ S713 is the same as the process of S612~S614, and will not be described again.
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流 程， 是可以通过计算机程序来指令相关的硬件来完成， 所述的程序可存储于 一计算机可读取存储介质中， 该程序在执行时， 可包括如上述各方法的实施 例的流程。 其中， 所述的存储介质可为磁碟、 光盘、 只读存储记忆体 ( Read-Only Memory, ROM )或随机存者 i己忆体（ Random Access Memory, RAM )等。 A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (Random Access Memory, RAM) and so on.
图 8为本发明提供的分组数据网络网关第一实施例的结构示意图， 如图 8所示， 该分组数据网络网关包括： 接收模块 11和连接建立模块 12; 其中： 接收模块 1 1 , 用于接收分组数据网络 PDN连接建立请求， 所述分组数 据网络网关为归属用户服务器中存储的第一分组数据网络网关信息对应的网 关；  FIG. 8 is a schematic structural diagram of a first embodiment of a packet data network gateway according to the present invention. As shown in FIG. 8, the packet data network gateway includes: a receiving module 11 and a connection establishing module 12; wherein: a receiving module 1 1 is configured to: Receiving a packet data network PDN connection establishment request, where the packet data network gateway is a gateway corresponding to the first packet data network gateway information stored in the home subscriber server;
连接建立模块 12, 用于获取第二分组数据网络网关信息， 以使第二网关 与接入网关网元或移动管理实体或服务网关建立 PDN连接，所述第二分组数 据网络网关信息与切换过程之前建立 PDN连接的第二网关相对应。  The connection establishing module 12 is configured to obtain second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information and the handover process Corresponding to the second gateway that previously established the PDN connection.
图 9为本发明提供的分组数据网络网关第二实施例的结构示意图， 如图 FIG. 9 is a schematic structural diagram of a second embodiment of a packet data network gateway according to the present invention, as shown in FIG.
9所示， 该分组数据网络网关包括： 接收模块 11和连接建立模块 12; As shown in Figure 9, the packet data network gateway includes: a receiving module 11 and a connection establishing module 12;
作为一种较佳的实施例， 该分组数据网络网关还可以包括：  As a preferred embodiment, the packet data network gateway may further include:
存储模块 13, 用于存储第二分组数据网络网关信息；  a storage module 13, configured to store second packet data network gateway information;
存储模块 13 中存储的第二分组数据网络网关信息从所述接入网关网元 或移动管理实体经由服务网关发送的通知请求消息中获取。  The second packet data network gateway information stored in the storage module 13 is obtained from the notification request message sent by the access gateway network element or the mobility management entity via the serving gateway.
作为另一种较佳的实施例， 所述第二分组数据网络网关信息还可以存储 在策略与计费规则功能网元 PCRF上，所述 PCRF从所述第二网关发送的会 话修改请求中获取所述第二分组数据网络网关信息。  As another preferred embodiment, the second packet data network gateway information may also be stored in a policy and charging rule function network element PCRF, where the PCRF is obtained from a session modification request sent by the second gateway. The second packet data network gateway information.
则相应的， 所述连接建立模块 12可以包括：  Correspondingly, the connection establishing module 12 may include:
发送单元 121 , 用于向所述 PCRF发送会话请求消息， 所述会话请求消 息中携带指示信息 ,所述指示信息用于指示获取第二分组数据网络网关信息； 接收单元 122, 用于接收所述 PCRF返回的会话响应消息， 所述会话响 应消息中携带所述第二分组数据网络网关信息， 以使所述第二网关与接入网 关网元或移动管理实体建立 PDN连接。  The sending unit 121 is configured to send a session request message to the PCRF, where the session request message carries indication information, where the indication information is used to indicate that the second packet data network gateway information is obtained, and the receiving unit 122 is configured to receive the The session response message returned by the PCRF, where the session response message carries the second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity.
进一步的， 所述连接建立模块 12 可以具体用于： 向所述第二网关发送 Further, the connection establishing module 12 may be specifically configured to: send to the second gateway
PDN连接建立请求； 或者， 将所述第二分组数据网络网关信息发送至所述接入网关网元或服 务网关或移动管理实体， 以使所述接入网关网元或服务网关或移动管理实体 向所述第二网关发送所述 PDN连接建立请求。 PDN connection establishment request; Or sending the second packet data network gateway information to the access gateway network element or the serving gateway or the mobility management entity, so that the access gateway network element or the serving gateway or the mobility management entity is to the second The gateway sends the PDN connection setup request.
其中， 所述分组数据网络网关信息包括分组数据网络网关标识， 所述分 组数据网络网关标识包括： 分组数据网络网关地址或者分组数据网络网关的 全称域名 FQDN信息， 还可以包括与分组数据网络网关连接相关的接入点名 称 APN , 此外还可以包括用户设备的标识信息， 例如 IMSI或者 IMEI等。  The packet data network gateway information includes a packet data network gateway identifier, and the packet data network gateway identifier includes: a packet data network gateway address or a full-name domain name FQDN information of the packet data network gateway, and may further include connecting to the packet data network gateway. The associated access point name APN may also include identification information of the user equipment, such as IMSI or IMEI.
本发明实施例提供的分组数据网络网关， 与本发明实施例提供的分组数 据网络 PDN连接建立方法相对应， 为执行该方法的功能设备，其具体执行过 程可参见方法实施例， 在此不再赘述。  The packet data network gateway provided by the embodiment of the present invention corresponds to the PDN connection establishment method of the packet data network provided by the embodiment of the present invention. For the function device of the method, the specific implementation process can be referred to the method embodiment. Narration.
本实施例提供的分组数据网络网关， 当归属用户服务器中存储的 P-GW1 信息对应的第一网关获取到 PDN连接建立请求后， 根据预先存储的 P-GW2 信息建立接入网关网元或服务网关或移动管理实体到对应的第二网关的 PDN连接。保证 UE在 3GPP和非 3GPP之间切换流程的正常执行，保证业 务正常进行。  The packet data network gateway provided in this embodiment, after the first gateway corresponding to the P-GW1 information stored in the home subscriber server obtains the PDN connection establishment request, establishes an access gateway network element or service according to the pre-stored P-GW2 information. The PDN connection of the gateway or mobility management entity to the corresponding second gateway. Ensure that the UE performs the normal execution of the handover process between 3GPP and non-3GPP to ensure that the service is normal.
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。  It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

权 利 要 求 Rights request
1、 一种分组数据网络 PDN连接建立方法， 其特征在于， 包括： 第一网关接收 PDN连接建立请求，所述第一网关为归属用户服务器中存 储的第一分组数据网络网关信息对应的网关；  A packet data network PDN connection establishing method, comprising: receiving, by a first gateway, a PDN connection establishment request, wherein the first gateway is a gateway corresponding to the first packet data network gateway information stored in the home subscriber server;
所述第一网关获取第二分组数据网络网关信息， 以使第二网关与接入网 关网元或移动管理实体或服务网关建立 PDN连接，所述第二分组数据网络网 关信息与切换过程之前建立 PDN连接的所述第二网关相对应。  The first gateway acquires second packet data network gateway information, so that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information is established before the handover process. The second gateway of the PDN connection corresponds.
2、 根据权利要求 1所述的方法， 其特征在于， 所述 PDN连接建立请求 为代理绑定更新消息或建立会话请求。  2. The method according to claim 1, wherein the PDN connection establishment request is a proxy binding update message or a session establishment request.
3、根据权利要求 1或 2所述的方法， 其特征在于， 所述第二分组数据网 络网关信息存储在所述第一网关上。  The method according to claim 1 or 2, wherein the second packet data network gateway information is stored on the first gateway.
4、 根据权利要求 3所述的方法， 其特征在于， 所述第一网关从接入网关 网元或移动管理实体经由服务网关发送的通知请求消息中获取所述第二分组 数据网络网关信息。  The method according to claim 3, wherein the first gateway acquires the second packet data network gateway information from a notification request message sent by the access gateway network element or the mobility management entity via the serving gateway.
5、 根据权利要求 4所述的方法， 其特征在于， 所述接入网关网元或移动 管理实体根据收到的保存分组数据网络网关信息的指示信息或者自身策 略， 将所述第二分组数据网络网关信息包括在所述通知请求消息中发送给第 一网关。  The method according to claim 4, wherein the access gateway network element or the mobility management entity sets the second packet data according to the received indication information of the saved packet data network gateway information or its own policy. The network gateway information is sent to the first gateway in the notification request message.
6、根据权利要求 1或 2所述的方法， 其特征在于， 所述第二分组数据网 络网关信息存储在策略与计费规则功能网元 PCRF上。  The method according to claim 1 or 2, wherein the second packet data network gateway information is stored on a policy and charging rule function network element PCRF.
7、 根据权利要求 6所述的方法， 其特征在于， 所述第一网关获取第二分 组数据网络网关信息， 具体为：  The method according to claim 6, wherein the first gateway acquires the second packet data network gateway information, specifically:
所述第一网关向所述 PCRF发送会话请求消息， 所述会话请求消息中携 带指示信息， 所述指示信息用于指示获取第二分组数据网络网关信息；  The first gateway sends a session request message to the PCRF, where the session request message carries indication information, where the indication information is used to indicate that the second packet data network gateway information is obtained;
所述第一网关接收所述 PCRF返回的会话响应消息， 所述会话响应消息 中携带所述第二分组数据网络网关信息。 The first gateway receives the session response message returned by the PCRF, where the session response message carries the second packet data network gateway information.
8、 根据权利要求 6所述的方法， 其特征在于， 所述 PCRF从所述第二 网关发送的会话修改请求中获取所述第二分组数据网络网关信息。 The method according to claim 6, wherein the PCRF acquires the second packet data network gateway information from a session modification request sent by the second gateway.
9、 根据权利要求 8所述的方法， 其特征在于， 所述第二网关根据收到的 保存分组数据网络网关信息的指示信息或者自身策略， 将所述第二分组数 据网络网关信息包括在会话修改请求消息中发送给 PCRF。  The method according to claim 8, wherein the second gateway includes the second packet data network gateway information in the session according to the received indication information of the saved packet data network gateway information or the self-policy. The modification request message is sent to the PCRF.
10、 根据权利要求 1所述的方法， 其特征在于， 所述第二网关与接入网 关网元或移动管理实体或服务网关建立 PDN连接之前， 还包括：  The method according to claim 1, wherein before the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the service gateway, the method further includes:
所述第一网关向所述第二网关发送 PDN连接建立请求；  The first gateway sends a PDN connection establishment request to the second gateway;
或者， 所述第一网关将所述第二分组数据网络网关信息发送至接入网关 网元或移动管理实体或服务网关。  Or the first gateway sends the second packet data network gateway information to an access gateway network element or a mobility management entity or a serving gateway.
11、 根据权利要求 10 所述的方法， 其特征在于， 所述第二网关与接入 网关网元或移动管理实体或服务网关建立 PDN连接， 还包括：  The method according to claim 10, wherein the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the service gateway, and further includes:
所述第一网关向所述第二网关发送更新分组数据网络网关信息的指示信 息， 或者所述第一网关通过所述接入网关向所述第二网关发送所述更新分组 数据网络网关信息的指示信息；  The first gateway sends, to the second gateway, indication information for updating packet data network gateway information, or the first gateway sends the update packet data network gateway information to the second gateway by using the access gateway. Indication information;
所述第二网关根据所述更新分组数据网络网关信息的指示信息或者根据 自身策略， 将所述第二分组数据网络网关信息包括在通知请求消息中发送给 归属用户服务器或者认证、 授权和计费服务器， 以使所述归属用户服务器或 者认证、 授权和计费服务器存储所述第二分组数据网络网关信息。  The second gateway sends the second packet data network gateway information to the home subscriber server or the authentication, authorization, and charging according to the indication information of the updated packet data network gateway information or according to its own policy. And a server, so that the home subscriber server or the authentication, authorization, and accounting server stores the second packet data network gateway information.
12、 根据权利要求 10 所述的方法， 其特征在于， 所述第二网关与接入 网关网元或移动管理实体或服务网关建立 PDN连接， 还包括：  The method according to claim 10, wherein the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the service gateway, and further includes:
所述移动管理实体将获取的第二分组数据网络网关信息包括在通知请求 消息中发送给归属用户服务器或者认证、 授权和计费服务器， 以使所述归属 用户服务器或者认证、 授权和计费服务器存储所述第二分组数据网络网关信 息。  The mobility management entity includes the obtained second packet data network gateway information in the notification request message and sent to the home subscriber server or the authentication, authorization, and accounting server, so that the home subscriber server or the authentication, authorization, and accounting server And storing the second packet data network gateway information.
13、 根据权利要求 12 所述的方法， 其特征在于， 所述移动管理实体从 接收到的建立会话响应消息或者建立会话拒绝消息中获取所述第二分组数据 网络网关信息。 13. The method according to claim 12, wherein the mobility management entity is And acquiring the second packet data network gateway information in the received session establishment response message or the establishment session rejection message.
14、 根据权利要求 1或 2所述的方法， 其特征在于， 所述分组数据网络 网关信息包括分组数据网络网关标识， 所述分组数据网络网关标识包括： 分 组数据网络网关地址或者分组数据网络网关的全称域名 FQDN信息；  The method according to claim 1 or 2, wherein the packet data network gateway information comprises a packet data network gateway identifier, and the packet data network gateway identifier comprises: a packet data network gateway address or a packet data network gateway Full name domain name FQDN information;
和 /或与分组数据网络网关连接相关的接入点名称 APN;  And/or the access point name associated with the packet data network gateway connection APN;
和 /或用户设备标识信息。  And / or user device identification information.
15、 一种分组数据网络网关， 其特征在于， 包括：  15. A packet data network gateway, comprising:
接收模块， 用于接收分组数据网络 PDN连接建立请求， 所述分组数据网 络网关为归属用户服务器中存储的第一分组数据网络网关信息对应的网关； 连接建立模块， 用于获取第二分组数据网络网关信息， 以使第二网关与 接入网关网元或移动管理实体或服务网关建立 PDN连接，所述第二分组数据 网络网关信息与切换过程之前建立 PDN连接的所述第二网关相对应。  a receiving module, configured to receive a packet data network PDN connection establishment request, where the packet data network gateway is a gateway corresponding to the first packet data network gateway information stored in the home user server, and a connection establishment module, configured to acquire the second packet data network The gateway information is such that the second gateway establishes a PDN connection with the access gateway network element or the mobility management entity or the serving gateway, and the second packet data network gateway information corresponds to the second gateway that established the PDN connection before the handover procedure.
16、 根据权利要求 15所述的分组数据网络网关， 其特征在于， 还包括： 存储模块 , 用于存储所述第二分组数据网络网关信息。  The packet data network gateway according to claim 15, further comprising: a storage module, configured to store the second packet data network gateway information.
17、 根据权利要求 16 所述的分组数据网络网关， 其特征在于， 所述存 储模块存储的所述第二分组数据网络网关信息从所述接入网关网元或移动管 理实体经由服务网关发送的通知请求消息中获取。  The packet data network gateway according to claim 16, wherein the second packet data network gateway information stored by the storage module is sent from the access gateway network element or a mobility management entity via a serving gateway. Obtained in the notification request message.
18、 根据权利要求 15 所述的分组数据网络网关， 其特征在于， 所述第 二分组数据网络网关信息存储在策略与计费规则功能网元 PCRF上。  18. The packet data network gateway according to claim 15, wherein the second packet data network gateway information is stored on a policy and charging rule function network element PCRF.
19、 根据权利要求 18 所述的分组数据网络网关， 其特征在于， 所述连 接建立模块包括：  The packet data network gateway according to claim 18, wherein the connection establishment module comprises:
发送单元， 用于向所述 PCRF发送会话请求消息， 所述会话请求消息中 携带指示信息 , 所述指示信息用于指示获取第二分组数据网络网关信息； 接收单元， 用于接收所述 PCRF返回的会话响应消息， 所述会话响应消 息中携带所述第二分组数据网络网关信息， 以使所述第二网关与接入网关网 元或移动管理实体或服务网关建立 PDN连接。 a sending unit, configured to send a session request message to the PCRF, where the session request message carries indication information, where the indication information is used to indicate that the second packet data network gateway information is obtained, and the receiving unit is configured to receive the PCRF return Session response message, the session response message carrying the second packet data network gateway information, so that the second gateway and the access gateway network A meta or mobility management entity or service gateway establishes a PDN connection.
20、根据权利要求 15-19任一项所述的分组数据网络网关，其特征在于， 所述连接建立模块具体用于： 向所述第二网关发送 PDN连接建立请求；  The packet data network gateway according to any one of claims 15 to 19, wherein the connection establishing module is specifically configured to: send a PDN connection establishment request to the second gateway;
或者， 将所述第二分组数据网络网关信息发送至所述接入网关网元或移 动管理实体或服务网关， 以使所述接入网关网元或移动管理实体或服务网关 向所述第二网关发送所述 PDN连接建立请求。  Or sending the second packet data network gateway information to the access gateway network element or the mobility management entity or the serving gateway, so that the access gateway network element or the mobility management entity or the service gateway is to the second The gateway sends the PDN connection setup request.
21、 根据权利要求 15-19任一项所述的方法， 其特征在于， 所述分组数 据网络网关信息包括分组数据网络网关标识， 所述分组数据网络网关标识包 括： 分组数据网络网关地址或者分组数据网络网关的全称域名 FQDN信息； 和 /或与分组数据网络网关连接相关的接入点名称 APN;  The method according to any one of claims 15 to 19, wherein the packet data network gateway information comprises a packet data network gateway identifier, and the packet data network gateway identifier comprises: a packet data network gateway address or a packet The full name domain name FQDN information of the data network gateway; and/or the access point name APN associated with the packet data network gateway connection;
和 /或用户设备标识信息。  And / or user device identification information.
PCT/CN2011/071304 2011-02-25 2011-02-25 Packet data network (pdn) connection establishment method and equipment WO2012113153A1 (en)

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