WO2016086611A1 - 获取PGW FQDN的方法、Home PGW及系统 - Google Patents

获取PGW FQDN的方法、Home PGW及系统 Download PDF

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Publication number
WO2016086611A1
WO2016086611A1 PCT/CN2015/079098 CN2015079098W WO2016086611A1 WO 2016086611 A1 WO2016086611 A1 WO 2016086611A1 CN 2015079098 W CN2015079098 W CN 2015079098W WO 2016086611 A1 WO2016086611 A1 WO 2016086611A1
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WIPO (PCT)
Prior art keywords
pgw
home
visited
fqdn
mme
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PCT/CN2015/079098
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English (en)
French (fr)
Inventor
涂小勇
叶敏雅
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中兴通讯股份有限公司
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Publication of WO2016086611A1 publication Critical patent/WO2016086611A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00695—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using split of the control plane or user plane

Definitions

  • This document relates to the field of communication technology, and particularly relates to a method for obtaining a PGW FQDN (Fully Qualified Domain Name) when a roaming user uses a proxy data network gateway (PGW) to return to a local access, and a Home PGW. And system.
  • PGW FQDN Frully Qualified Domain Name
  • PGW proxy data network gateway
  • SAE System Architecture Evolution
  • E-RAN Evolved RAN, Evolved Radio Access Network
  • the network element included in the E-RAN is an eNodeB (Evolved NodeB), which provides radio resources for terminal access.
  • eNodeB Evolved NodeB
  • HSS Home Subscriber Server
  • HSS Home Subscriber Server
  • MME Mobility Management Entity: A control plane function entity that temporarily stores user data. It is responsible for managing and storing UE (User Equipment) contexts (such as UE/user ID, mobility management status, and user security). The parameter, etc., allocates a temporary identifier to the user, and is responsible for authenticating the user when the UE is camped in the tracking area; processing all non-access stratum messages between the MME and the UE; triggering paging at the SAE.
  • UE User Equipment
  • the SGW (Serving GW) is a user plane entity responsible for user plane data routing processing and terminating downlink data of the UE in idle state. Manage and store the SAE bearer context of the UE, such as IP bearer service parameters and network internal routing information.
  • the SGW is an anchor point of the internal user plane of the 3GPP system, and one user can only have one Serving GW at a time;
  • PGW Packet Data Network Gateway
  • PDN Packet Data Network gateway
  • the function entity generates Qos (Quality of Service) rules for controlling user data transmission based on service information, user subscription information, and operator configuration information. And billing rules.
  • Qos Quality of Service
  • the functional entity can also control the establishment and release of bearers in the access network.
  • SGSN Server GPRS Support Node, GPRS (General Packet Radio Service) Supporting Node
  • a server that temporarily stores user data, responsible for managing and storing UE related information, such as UE/user identity, mobility management. Status, user security parameters, etc., assign temporary identifiers to users, complete user security functions, complete user mobility management functions and session management functions, and process all non-access stratum messages between SGSN and UE.
  • UTRAN UMTS Terrestrial Radio Access Network
  • 3G third generation mobile communication network
  • GSM EDGE Radio Access Network A GPRS/EDGE radio access network that provides radio resources for terminal access.
  • next-generation mobile network can support users' roaming services between mobile networks in different regions and countries, and also support users to access services in different access modes, including 3GPP. Incoming and non-3GPP access.
  • the proxy PGW Proxy PGW
  • the proxy PGW can be used to implement roaming user access to the home location and perform data services.
  • the UE roams from the Public Land Mobile-Communication Network (HPLMN) to the visited site (Rosited PLMN)
  • the MME Visited MME
  • the Visited MME sends a create session request to the proxy PGW, and then the proxy PGW forwards the PGW (Home PGW) that creates the session request to the UE's home location, and then the subsequent PS (Packet Switch) is performed by the Visited MME and the Home PGW. )business.
  • PGW Packet Switch
  • the Visited MME does not obtain the FQDN of the Home PGW, and subsequently informs the HSS that the PGW FQDN of the HSS is the FQDN of the Proxy PGW, that is, the UE is not actually accessed. PGW. Then if the UE switches to non-3GPP, because the PGW is the mobility anchor of the 3GPP and the non-3GPP access system, under the non-3GPP access, the PWS FQDN that the UE actually accesses cannot be obtained from the HSS, so the handover will fail, resulting in serious Affect users' experience of the business.
  • the Visited MME does not obtain the PGW that the UE actually accesses. After the subsequent UE returns to the HPLMN, the Home MME cannot select the SGW that has the closest relationship with the PGW topology that the UE actually accesses, thereby wasting network resources.
  • the embodiment of the present invention provides a method for acquiring a PGW FQDN, a Home PGW, and a system, which can overcome the FQDN information of the PGW (Home PGW) that is actually accessed when the Proxy PGW is used in the related art, resulting in a relationship between the 3GPP and the non-3GPP.
  • the problem of mutual cut failure is a problem of mutual cut failure.
  • An embodiment of the present invention provides a method for obtaining a PGW FQDN, including:
  • the Home PGW receives the Create Session Request message from the Visited MME forwarded by the proxy PGW;
  • a create session response message is returned to the Visited MME or the Visited SGSN through the Visited SGW; the Create Session Response message carries the FQDN of the Home PGW.
  • the data service includes at least one of the following: the UE requests the Visited MME to initiate the PDN connection establishment process; the UE initiates the attach procedure under the Long Term Evolution LTE; the UE activates the process for the first time under GERAN or UTRAN; and the UE returns to the HPLMN process .
  • An embodiment of the present invention further provides a Home PGW for acquiring a PGW FQDN, including:
  • a receiving module configured to: when the UE accesses the home location through the proxy PGW and performs data service, the receiving proxy PGW forwards the create session request message from the Visited MME;
  • the sending module is configured to return a create session response message to the Visited MME or the Visited SGSN through the Visited SGW; the create session response message carries the FQDN of the Home PGW.
  • the embodiment of the invention further provides a method for obtaining a fully qualified domain name FQDN of a packet data network gateway PGW, including:
  • the home PGW moves to the roaming mobile management entity Visited MME or the roaming place.
  • the serving general packet radio service GPRS support node Visited SGSN returns a create session response message; the create session response message carries the FQDN of the Home PGW;
  • the Visited MME or Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message.
  • the method before the home PGW receives the create session request message, the method further includes:
  • the Visited MME or the Visited SGSN sends a create session request message to the proxy PGW through the Visited SGW, and the proxy PGW requests the create session The message is forwarded to the Home PGW.
  • the method further includes:
  • the Visited MME or the Visited SGSN sends a request message to the home subscriber server HSS, and notifies the HSS of the FQDN association relationship between the access point name APN and the PGW that the UE actually accesses;
  • the FQDN of the PGW is the FQDN of the Home PGW carried by the Home PGW in the Create Session Response message.
  • the method further includes:
  • the HSS When the UE moves to non-3GPP, the HSS provides the APN and PGW FQDN information of the activated PDN connection to the non-3GPP system, and the APN and PGW FQDN are the APN and PGW FQDN notified to the HSS by the Visited MME or the Visited SGSN. .
  • the data service includes at least one of the following: the UE requests the Visited MME to initiate a PDN connection setup procedure; the UE initiates the attach procedure under LTE; the UE activates the procedure for the first time under GERAN or UTRAN; and the UE returns to the HPLMN procedure.
  • the method further includes:
  • the Visited MME When the UE returns to the HPLMN, when the Visited MME sends a message to the Home MME, it carries the FQDN of the Home PGW;
  • the Home MME selects the Home SGW closest to the Home PGW topology according to the FQDN of the Home PGW.
  • the embodiment of the present invention further provides a system for acquiring a PGW FQDN, including: a Visited MME or a Visited SGSN, and a Home PGW; wherein:
  • the Home PGW is configured to: when the user equipment UE accesses the home location and performs data service from the roaming place through the proxy PGW, after receiving the create session request message, return a create session response message to the Visited MME or the Visited SGSN.
  • the create session response message carries the FQDN of the Home PGW;
  • the Visited MME or Visited SGSN is set to save the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or the Visited SGSN is further configured to: when the UE accesses the home location through the proxy PGW and performs data service, send a create session request message to the proxy PGW by using the Visited SGW, by the proxy The PGW forwards the create session request message to the Home PGW of the UE;
  • the Home PGW is further configured to, after receiving the Create Session Request message, return a Create Session Response message to the Visited MME or the Visited SGSN through the Visited SGW.
  • the system further includes an HSS;
  • the Visited MME or the Visited SGSN is further configured to: when the UE supports the handover to the non-3GPP access, send a request message to the HSS, and notify the HSS of the FQDN association relationship between the APN and the PGW that the UE actually accesses; the PGW The FQDN is the FQDN of the Home PGW carried by the Home PGW in the Create Session Response message.
  • the HSS is configured to provide the non-3GPP system with the APN and PGW FQDN information of the activated PDN connection when the UE moves to the non-3GPP, where the APN and the PGW FQDN are notified by the Visited MME or the Visited SGSN. APS and PGW FQDN for HSS.
  • the data service includes at least one of the following: the UE requests initiation from the Visited MME PDN connection establishment process; UE initiates attach procedure under LTE; UE activates process for the first time under GERAN or UTRAN; UE returns to HPLMN process.
  • the system further includes: a Home MME;
  • the Visited MME is further configured to: when the UE returns to the HPLMN, send a message to the Home MME, carrying the FQDN of the Home PGW;
  • the Home MME is configured to select a Home SGW that is closest to the Home PGW topology according to the FQDN of the Home PGW.
  • the method for acquiring the PGW FQDN, the home PGW, and the system which are provided by the embodiment of the present invention, overcome the problem that the MME cannot obtain the FQDN information of the PGW (Home PGW) actually accessed when the Proxy PGW is used in the related art, in the roaming user
  • the FQDN of the Home PGW that the UE actually accesses is obtained, so that when the proxy PGW is used, the handover between the 3GPP and the non-3GPP can also be supported, thereby improving the user experience.
  • the Home MME can also select the SGW that has the closest PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • FIG. 1 is a schematic diagram of a SAE architecture in the related art
  • FIG. 2 is a schematic diagram of a process of implementing a roaming user access attribution by using a Proxy PGW technology in the related art
  • FIG. 3a is a schematic flowchart of an embodiment of a method for obtaining a PGW FQDN
  • FIG. 3b is a schematic flowchart of another embodiment of a method for obtaining a PGW FQDN
  • FIG. 4 is a schematic flow chart of an embodiment of a PDN connection establishment process requested by a UE when a proxy Proxy PGW is used;
  • FIG. 5 is a schematic flowchart of an embodiment of a process of attaching a UE to a LTE (Long Term Evolution) process when a Proxy PGW is used;
  • LTE Long Term Evolution
  • Figure 6 is a first activation process of the UE under GERAN/UTRAN when using the Proxy PGW. Schematic diagram of an embodiment
  • FIG. 7 is a schematic flow chart of an embodiment of a UE returning to the HPLMN process when the Proxy PGW is used;
  • FIG. 8 is a schematic flow chart of another embodiment of a method for obtaining a PGW FQDN
  • FIG. 9 is a schematic diagram of a functional module of an embodiment of a Home PGW that acquires a PGW FQDN.
  • This paper relates to the field of packet domain evolution domain in mobile communication system, and relates to a method and system for acquiring the FQDN of the Home PGW that the UE actually accesses when the roaming user uses the proxy PGW to return to the terrestrial access, so that the 3GPP can also be supported when using the proxy PGW. Switching between non-3GPP.
  • the solution of the embodiment of the present invention is mainly: when the UE accesses the home location through the proxy PGW and performs the data service, the Visited MME sends a create session request message to the proxy PGW through the Visited SGW, where the proxy PGW The Create Session Request message is forwarded to the Home PGW of the UE. After receiving the Create Session Request message, the Home PGW returns a Create Session Response message to the Visited MME or the Visited SGSN through the Visited SGW. The Create Session Response message carries the Home PGW. FQDN; The Visited MME or Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message. Therefore, when the proxy PGW is used, the MME can obtain the FQDN information of the PGW (Home PGW) actually accessed, and support the handover between the 3GPP and the non-3GPP to improve the user experience.
  • FIG. 2 is a schematic flowchart of a method for implementing a roaming user to access a home location and performing a PS service by using a proxy PGW technology in the related art. As shown in FIG. 2, the method includes the following steps:
  • Step 201 The roaming user initiates a PDN connection establishment to the MME (Visited MME) of the roaming place;
  • Step 202 The Visited MME initiates a DNS (Domain Name System) resolution process, and parses the control plane address of the Proxy PGW.
  • DNS Domain Name System
  • Step 203 The DNS server returns a control plane address and a FQDN (Fully Qualified Domain Name) of the Proxy PGW to the Visited MME.
  • FQDN Frully Qualified Domain Name
  • Step 204 The Visited MME sends a Create Session Request message to the Visited SGW, carrying the control plane address of the Proxy PGW.
  • Step 205 The Visited SGW sends a create session request message to the Proxy PGW.
  • Step 206 After receiving the Create Session Request message, the Proxy PGW parses the packet to obtain the user identification information, and the Proxy PGW translates the PGW (Home PGW) address of the user's subscription destination according to the information.
  • the user identification information may be an Mobile Station Integrated Services Digital Network (IMSISDN) or an International Mobile Subscriber Identification Number (IMSI).
  • IMSISDN Mobile Station Integrated Services Digital Network
  • IMSI International Mobile Subscriber Identification Number
  • Step 207 The Proxy PGW modifies the destination IP address of the IP packet in the session request message to the address of the Home PGW corresponding to the MSISDN or the IMSI, and sends the modified create session request message to the Home PGW.
  • Step 208 After receiving the Create Session Request message, the Home PGW directly returns a Create Session Response to the Visited SGW, carrying the IP address of the Home PGW, but does not carry the FQDN of the Home PGW;
  • Step 209 The Visited SGW returns a Create Session Response to the Visited MME, carrying the IP address of the Home PGW, but does not carry the FQDN of the Home PGW;
  • Step 210 The Visited MME sends a bearer setup request message to the eNodeB, where the message carries an active default EPS bearer context request message to the UE.
  • Step 211 The eNodeB sends an RRC connection reconfiguration message to the UE, where the message carries an activation default EPS bearer context request message to the UE.
  • Step 212 The UE returns an RRC connection reconfiguration complete message to the eNodeB.
  • Step 213 The eNodeB returns a bearer setup response message to the Visited MME.
  • Step 214 The UE sends an activation default EPS bearer context accept message to the Visited MME.
  • Step 215 The Visited MME sends a modify bearer request message to the Visited SGW.
  • Step 216 the Visited SGW returns to modify the bearer response to the Visited MME;
  • Step 217 if the user supports handover to non-3GPP access, Visited MME to HSS Sending a notification request, notifying the HSS of the APN (Access Point Name) and the PGW FQDN association relationship, and the PGW FQDN is the FQDN of the Proxy PGW queried according to the DNS;
  • APN Access Point Name
  • PGW FQDN is the FQDN of the Proxy PGW queried according to the DNS
  • the PGW information of the PDN connection is activated to the HSS.
  • Step 218 The HSS stores the association relationship between the APN and the PGW FQDN, and returns a notification response message to the Visited MME.
  • the Visited MME does not obtain the FQDN of the Home PGW, and the PGW FQDN of the subsequent notification is the FQDN of the Proxy PGW, that is, the PGW that is not actually accessed by the UE. Then if the UE switches to non-3GPP, because the PGW is the mobility anchor of the 3GPP and the non-3GPP access system, the PGW FQDN that the UE actually accesses cannot be obtained from the HSS under the non-3GPP access, so the handover will fail, causing serious impact. User experience with the business.
  • the Visited MME does not obtain the PGW that the UE actually accesses. After the subsequent UE returns to the HPLMN, the Home MME cannot select the SGW that is closest to the PGW topology that the UE actually accesses.
  • the solution of the embodiment of the present invention can overcome the problem that the MME cannot obtain the FQDN information of the PGW (Home PGW) actually accessed when the Proxy PGW is used in the related art, which causes the mutual handover failure between the non-3GPP and the UE to return.
  • the Home MME can also select the SGW that has the closest relationship to the PGW topology that the UE actually accesses, saving network resources.
  • an embodiment of the present invention provides a method for acquiring a PGW FQDN.
  • Step S302 After receiving the Create Session Request message, the Home PGW returns a Create Session Response message to the Visited MME or the Visited SGSN, where the Create Session Response message carries the FQDN of the Home PGW.
  • the system operating environment involves the UE, the Visited MME, the Proxy PGW, the Home PGW, the Visited SGW, the Visited SGSN, the HSS, the Home MME, and the like.
  • the solution of the embodiment of the present invention is applicable to a scenario in which a Proxy PGW is adopted.
  • the Visited MME sends a Create Session Request message to the Proxy PGW via the Visited SGW, and the Proxy PGW forwards the Create Session Request message to the Home PGW of the UE.
  • the data service includes, but is not limited to, at least one of the following: the UE requests the Visited MME to initiate a PDN connection setup procedure; the UE initiates the attach procedure under LTE; the UE activates the procedure for the first time under GERAN or UTRAN; and the UE returns to the HPLMN procedure.
  • the Home PGW After receiving the Create Session Request message, the Home PGW directly returns a Create Session Response message to the Visited SGW, and carries the FQDN of the Home PGW in the Session Response message.
  • the Visited SGW returns a Create Session Response message to the Visited MME or Visited SGSN, carrying the FQDN of the Home PGW.
  • Step S303 the Visited MME or the Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or the Visited SGSN sends a request message to the HSS, and notifies the HSS of the FQDN association relationship between the APN and the PGW that the user actually accesses;
  • the FQDN of the PGW is the FQDN of the Home PGW carried by the Home PGW in the Create Session Response message.
  • the HSS when the UE moves to the non-3GPP, the HSS provides the non-3GPP system with the APN and PGW FQDN information of the activated PDN connection, and the APN and the PGW FQDN are notified to the HSS by the Visited MME or the Visited SGSN. APN and PGW FQDN.
  • the Visited MME carries the FQDN of the Home PGW when sending the message to the Home MME; the Home MME selects the Home SGW closest to the Home PGW topology according to the FQDN of the Home PGW. Therefore, after the UE returns to the HPLMN, the Home MME cannot select the SGW problem that is closest to the PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • the foregoing solution overcomes the problem that the MME cannot obtain the FQDN information of the PGW (Home PGW) actually accessed when the Proxy PGW is used in the related art, and obtains the true UE when the roaming user uses the proxy PGW to return to the local access.
  • the FQDN of the accessed Home PGW Therefore, when the proxy PGW is used, the handover between the 3GPP and the non-3GPP can also be supported, and the user experience is improved.
  • the Home MME can also select the SGW that has the closest PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • another embodiment of the present invention provides a method for acquiring a PGW FQDN, including:
  • Step S301 when the UE accesses the home location through the proxy PGW and performs the data service, the Visited MME or the Visited SGSN sends a create session request message to the proxy PGW through the Visited SGW, where the proxy PGW requests the create session. Transmitting a message to the Home PGW of the UE;
  • the system operating environment involves the UE, the Visited MME, the Proxy PGW, the Home PGW, the Visited SGW, the Visited SGSN, the HSS, the Home MME, and the like.
  • the solution of the embodiment of the present invention is applicable to a scenario in which a Proxy PGW is adopted.
  • the Visited MME sends a create session request message to the proxy PGW through the Visited SGW, and the proxy PGW forwards the create session request message to the The Home PGW of the UE.
  • the data service includes, but is not limited to, at least one of the following: the UE requests the Visited MME to initiate a PDN connection setup procedure; the UE initiates the attach procedure under LTE; the UE activates the procedure for the first time under GERAN or UTRAN; and the UE returns to the HPLMN procedure.
  • Step S302 the Home PGW returns a Create Session Response message to the Visited MME or the Visited SGSN through the Visited SGW after receiving the Create Session Request message; the Create Session Response message carries the FQDN of the Home PGW;
  • the Home PGW After receiving the Create Session Request message, the Home PGW directly returns a Create Session Response message to the Visited SGW, and carries the FQDN of the Home PGW in the Session Response message.
  • the Visited SGW returns a Create Session Response message to the Visited MME or Visited SGSN, carrying the FQDN of the Home PGW.
  • Step S303 the Visited MME or the Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or the Visited SGSN sends a request message to the HSS, and notifies the HSS of the FQDN association relationship between the APN and the PGW that the user actually accesses;
  • the FQDN of the PGW is the FQDN of the Home PGW carried by the Home PGW in the Create Session Response message.
  • the HSS when the UE moves to the non-3GPP, the HSS provides the non-3GPP system with the APN and PGW FQDN information of the activated PDN connection, and the APN and the PGW FQDN are notified to the HSS by the Visited MME or the Visited SGSN. APN and PGW FQDN.
  • the Visited MME carries the FQDN of the Home PGW when sending the message to the Home MME; the Home MME selects the Home SGW closest to the Home PGW topology according to the FQDN of the Home PGW. Therefore, after the UE returns to the HPLMN, the Home MME cannot select the SGW problem that is closest to the PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • the foregoing solution overcomes the problem that the MME cannot obtain the FQDN information of the PGW (Home PGW) actually accessed when the Proxy PGW is used in the related art, and obtains the true UE when the roaming user uses the proxy PGW to return to the local access.
  • the FQDN of the Home PGW that is accessed, so that when the proxy PGW is used, the handover between the 3GPP and the non-3GPP can also be supported, thereby improving the user experience.
  • the Home MME can also select the SGW that has the closest PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • the following describes the process of requesting the originating PDN connection establishment process by the UE to the Visited MME, the UE attaching process under LTE, the first activation process of the UE under GERAN/UTRAN, and the data service processing process when the UE returns to the HPLMN process:
  • FIG. 4 it is an embodiment in a process of establishing a PDN connection requested by a UE when a Proxy PGW is used, including the following steps:
  • Step 401 The roaming user initiates a PDN connection establishment to the MME (Visited MME) of the roaming place;
  • Step 402 The Visited MME initiates resolution of a Domain Name System (DNS) Flow, parsing the control plane address of the Proxy PGW;
  • DNS Domain Name System
  • Step 403 The DNS server returns the control plane address and the FQDN of the Proxy PGW to the Visited MME.
  • Step 404 The Visited MME sends a Create Session Request message to the Visited SGW, and carries the control plane address of the Proxy PGW.
  • Step 405 The Visited SGW sends a create session request message to the Proxy PGW.
  • Step 406 After receiving the Create Session Request message, the Proxy PGW parses the packet to obtain the user identification information, and the Proxy PGW translates the PGW (Home PGW) address of the user's subscription destination according to the information.
  • the user identification information may be an Mobile Station Integrated Services Digital Network (IMSISDN) or an International Mobile Subscriber Identification Number (IMSI).
  • IMSISDN Mobile Station Integrated Services Digital Network
  • IMSI International Mobile Subscriber Identification Number
  • Step 407 The Proxy PGW modifies the destination IP address of the IP packet in the session request message to the address of the Home PGW corresponding to the MSISDN or IMSI, and sends the modified create session request message to the Home PGW.
  • Step 408 After receiving the Create Session Request message, the Home PGW directly returns a Create Session Response to the Visited SGW, carrying the IP address of the Home PGW, and also carrying the FQDN of the Home PGW;
  • Step 409 the Visited SGW returns a Create Session Response to the Visited MME, carrying the IP address of the Home PGW, and also carrying the FQDN of the Home PGW;
  • Step 410 The Visited MME saves the FQDN of the Home PGW.
  • Step 411 The Visited MME sends a bearer setup request message to the eNodeB, where the message carries an active default EPS bearer context request message to the UE.
  • Step 412 The eNodeB sends an RRC connection reconfiguration message to the UE, where the message carries an activation default EPS bearer context request message to the UE.
  • Step 413 The UE returns an RRC connection reconfiguration complete message to the eNodeB.
  • Step 414 the eNodeB returns a bearer setup response message to the Visited MME.
  • Step 415 The UE sends an activation default EPS bearer context accept message to the Visited MME.
  • Step 416 The Visited MME sends a modify bearer request message to the Visited SGW.
  • Step 417 the Visited SGW returns to modify the bearer response to the Visited MME
  • Step 418 If the user supports the handover to the non-3GPP access, the Visited MME sends a notification request to the HSS, and notifies the HSS of the APN and the PGW FQDN association relationship, and the PGW FQDN is the FQDN of the Proxy PGW queried according to the DNS;
  • the PGW information of the PDN connection is activated to the HSS.
  • the HSS stores the association relationship between the APN and the PGW FQDN, and returns a notification response message to the Visited MME.
  • an embodiment of a UE in a boot process during LTE is implemented in a Proxy PGW, including:
  • Step 501 The roaming user initiates attaching to the MME (Visited MME) of the roaming place;
  • Step 502 The Visited MME completes the authentication and security function for the UE.
  • Step 503 The Visited MME sends a location update message to the HSS to obtain user subscription information.
  • Step 504 the HSS returns a location update confirmation message to the Visited MME.
  • Step 505 The Visited MME initiates a DNS (Domain Name System) resolution process, and parses the control plane address of the Proxy PGW.
  • DNS Domain Name System
  • Step 506 the DNS server returns the control plane address and the FQDN of the Proxy PGW to the Visited MME.
  • Step 507 The Visited MME sends a Create Session Request message to the Visited SGW, carrying the control plane address of the Proxy PGW.
  • Step 508 The Visited SGW sends a create session request message to the Proxy PGW.
  • Step 509 After receiving the create session request message, the Proxy PGW parses the packet to obtain the user identifier information, and the Proxy PGW translates the PGW (Home PGW) address of the user's subscription destination according to the information.
  • the user identification information may be an Mobile Station Integrated Services Digital Network (IMSISDN) or an International Mobile Subscriber Identification Number (IMSI).
  • IMSISDN Mobile Station Integrated Services Digital Network
  • IMSI International Mobile Subscriber Identification Number
  • Step 510 The Proxy PGW modifies the destination IP address of the IP packet in the session request message to the address of the Home PGW corresponding to the MSISDN or the IMSI, and sends the modified create session request message to the Home PGW.
  • Step 511 After receiving the Create Session Request message, the Home PGW directly returns a Create Session Response to the Visited SGW, carrying the IP address of the Home PGW, and also carrying the FQDN of the Home PGW;
  • Step 512 the Visited SGW returns a Create Session Response to the Visited MME, carrying the IP address of the Home PGW, and also carrying the FQDN of the Home PGW;
  • Step 513 the Visited MME saves the FQDN of the Home PGW
  • Step 514 The Visited MME sends an initial context setup request message to the eNodeB, where the message carries an attach accept and activate default EPS bearer context request message to the UE.
  • Step 515 The eNodeB sends an RRC connection reconfiguration message to the UE, where the message carries an attach accept and activate a default EPS bearer context request message to the UE.
  • Step 516 The UE returns an RRC connection reconfiguration complete message to the eNodeB.
  • Step 517 the eNodeB returns an initial context setup response message to the Visited MME.
  • Step 518 The UE sends an Attach Complete and Activate Default EPS Bearer Context Accept message to the Visited MME.
  • Step 519 The Visited MME sends a modify bearer request message to the Visited SGW.
  • Step 520 the Visited SGW returns to modify the bearer response to the Visited MME;
  • Step 521 If the user supports the handover to the non-3GPP access, the Visited MME sends a notification request to the HSS, and notifies the HSS of the APN and the PGW FQDN association relationship, and the PGW FQDN is the FQDN of the Proxy PGW queried according to the DNS;
  • the PGW information of the PDN connection is activated to the HSS.
  • Step 522 The HSS stores the APN and PGW FQDN association relationship, and returns a notification response message to the Visited MME.
  • the embodiment is the first time that the UE is activated in the GERAN/UTRAN when the Proxy PGW is used, including:
  • Step 601 The roaming user initiates an activation PDP context request to the SGSN (Visited SGSN) of the roaming place;
  • Step 602 The Visited SGSN initiates a DNS (Domain Name System) parsing process, and parses the control plane address of the Proxy PGW.
  • DNS Domain Name System
  • Step 603 the DNS server returns the control plane address and the FQDN of the Proxy PGW to the Visited SGSN.
  • Step 604 The Visited SGSN determines to use the S4 interface to send a create session request message to the Visited SGW, and carries the control plane address of the Proxy PGW.
  • Step 605 The Visited SGW sends a create session request message to the Proxy PGW.
  • Step 606 After receiving the session creation request message, the Proxy PGW parses the message to obtain the user identification information, and the Proxy PGW translates the PGW (Home PGW) address of the user's subscription destination according to the information.
  • the user identification information may be an Mobile Station Integrated Services Digital Network (IMSISDN) or an International Mobile Subscriber Identification Number (IMSI).
  • IMSISDN Mobile Station Integrated Services Digital Network
  • IMSI International Mobile Subscriber Identification Number
  • Step 607 The Proxy PGW modifies the destination IP address of the IP packet in the session request message to the address of the Home PGW corresponding to the MSISDN or the IMSI, and sends the modified create session request message to the Home PGW.
  • Step 608 after receiving the Create Session Request message, the Home PGW directly returns a Create Session Response to the Visited SGW, carrying the IP address of the Home PGW, and also carrying the FQDN of the Home PGW;
  • Step 609 the Visited SGW returns a create session response to the Visited SGSN, carrying the IP address of the Home PGW, and also carrying the FQDN of the Home PGW;
  • Step 610 the Visited SGSN saves the FQDN of the Home PGW.
  • Step 611 if it is UTRAN access, the Visited SGSN sends an RAB Assignment Request message to the UTRAN;
  • Step 612 the UTRAN sends an RRC connection reconfiguration message to the UE.
  • Step 613 The UE returns an RRC connection reconfiguration complete message to the UTRAN.
  • Step 614 the UTRAN returns a RAB Assignment Response message to the Visited SGSN.
  • Step 615 If the PDP uses a single tunnel, the Visited SGSN sends a modify bearer request message to the Visited SGW.
  • Step 616 the Visited SGW returns a modified bearer response to the Visited SGSN
  • Step 617 If the user supports the handover to the non-3GPP access, the Visited SGSN sends a notification request to the HSS, and notifies the HSS of the APN and the PGW FQDN association relationship, and the PGW FQDN is the FQDN of the Proxy PGW queried according to the DNS;
  • the PGW information of the PDN connection is activated to the HSS.
  • Step 618 The HSS stores an association between the APN and the PGW FQDN, and returns a notification response message to the Visited SGSN.
  • Step 619 The Visited SGSN sends an activation PDP context accept message to the UE.
  • an embodiment in which the UE returns to the HPLMN process when the Proxy PGW is used includes:
  • Step 701 The roaming user completes attaching to the MME (Visited MME) of the roaming place through the Proxy PGW.
  • Step 702 The user initiates a tracking area update request message to the home MME (Home MME).
  • Step 703 The Home MME sends a context request message to the Visited MME.
  • Step 704 the Visited MME returns a context response message to the Home MME, carrying the FQDN of the Home PGW;
  • Step 705 The Home MME completes the authentication and security function for the UE.
  • Step 706 the Home MME returns a context confirmation message to the Visited MME.
  • Step 707 The Home MME initiates a DNS (Domain Name System) parsing process, and parses the control plane address of the Home SGW.
  • DNS Domain Name System
  • Step 708 the DNS server returns the control plane address and FQDN of the Home SGW to the Home MME.
  • Step 709 The Home MME selects a Home SGW that is closest to the Home PGW topology according to the FQDN of the Home PGW.
  • step 710 the tracking area update process is continued.
  • the solution of the foregoing embodiment overcomes the problem that the MME cannot obtain the FQDN information of the PGW (Home PGW) actually accessed when the Proxy PGW is used in the related art, and the roaming user uses the proxy PGW to return to the local access.
  • the FQDN of the Home PGW that the UE actually accesses is obtained, so that when the proxy PGW is used, the handover between the 3GPP and the non-3GPP can also be supported, thereby improving the user experience.
  • the Home MME can also select the SGW that has the closest PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • the embodiment of the present invention further provides a system for acquiring a PGW FQDN, including: a Sited MME, a proxy PGW, a Home PGW, a Visited SGW, a Visited SGSN, an HSS, a Home MME, and the like;
  • the Visited MME is configured to send a create session request message to the proxy PGW through the Visited SGW when the UE accesses the home location through the proxy PGW and performs data service, and the proxy PGW sends the create session request message by the proxy PGW. Forwarding to the Home PGW of the UE;
  • the Home PGW configured to return a Create Session Response message to the Visited MME or the Visited SGSN through the Visited SGW after receiving the Create Session Request message; the Create Session Response message carries the FQDN of the Home PGW;
  • the Visited MME or Visited SGSN is set to save the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or the Visited SGSN is also set to support the non-3GPP in the UE.
  • a request message is sent to the HSS, and the FQDN association relationship between the APN and the Home PGW is notified to the HSS.
  • the HSS is configured to provide the UE with PGW information of the activated PDN connection when the UE moves to non-3GPP.
  • the Visited MME is further configured to: when the UE returns to the HPLMN, send a message to the Home MME, carrying the FQDN of the Home PGW;
  • the Home MME is configured to select a Home SGW that is closest to the Home PGW topology according to the FQDN of the Home PGW.
  • the solution of the embodiment of the present invention is applicable to a scenario in which a Proxy PGW is adopted.
  • the Visited MME sends a create session request message to the proxy PGW through the Visited SGW, and the proxy PGW forwards the create session request message to the The Home PGW of the UE.
  • the data service includes at least one of the following: the UE requests the Visited MME to initiate a PDN connection establishment process; the UE initiates an attach procedure under LTE; the UE activates the process for the first time under GERAN or UTRAN; and the UE returns to the HPLMN process.
  • the Home PGW After receiving the Create Session Request message, the Home PGW directly returns a Create Session Response message to the Visited SGW, and carries the FQDN of the Home PGW in the Session Response message.
  • the Visited SGW returns a Create Session Response message to the Visited MME or Visited SGSN, carrying the FQDN of the Home PGW.
  • the Visited MME or Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or the Visited SGSN sends a request message to the HSS, and notifies the HSS of the FQDN association relationship between the APN and the Home PGW.
  • the UE when the UE moves to the non-3GPP, the UE acquires the PGW information of the activated PDN connection from the HSS.
  • the Visited MME carries the FQDN of the Home PGW when sending the message to the Home MME; the Home MME is based on the Home PGW.
  • the FQDN selects the Home SGW closest to the Home PGW topology. Therefore, after the UE returns to the HPLMN, the Home MME cannot select the SGW problem that is closest to the PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • This embodiment overcomes the problem that the MME cannot obtain the FQDN information of the PGW (Home PGW) actually accessed when the Proxy PGW is used in the related art, and obtains the true UE when the roaming user uses the proxy PGW to return to the local access.
  • the Home MME can also select the SGW that has the closest PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • the UE requests the originating PDN connection establishment procedure from the UE, the UE initiates the PDN connection setup process, the UE performs the first activation process in the GERAN/UTRAN, and the UE returns to the HPLMN process, refer to the foregoing embodiment. , will not repeat them here.
  • another embodiment of the present invention provides a method for acquiring a PGW FQDN, including:
  • Step S801 when the UE accesses the home location through the proxy PGW and performs data service, the Home PGW receives the create session request message from the Visited MME forwarded by the proxy PGW.
  • Step S802 returning a Create Session Response message to the Visited MME or the Visited SGSN by using the Visited SGW; the Create Session Response message carries the FQDN of the Home PGW.
  • the solution of the embodiment of the present invention is applicable to a scenario in which a Proxy PGW is adopted.
  • the Visited MME sends a create session request message to the proxy PGW through the Visited SGW, and the proxy PGW forwards the create session request message to the The Home PGW of the UE.
  • the data service includes at least one of the following: the UE requests the Visited MME to initiate a PDN connection establishment process; the UE initiates an attach procedure under LTE; the UE activates the process for the first time under GERAN or UTRAN; and the UE returns to the HPLMN process.
  • the Home PGW After receiving the Create Session Request message, the Home PGW directly returns a Create Session Response message to the Visited SGW, and carries the FQDN of the Home PGW in the Session Response message.
  • the Visited SGW returns a Create Session Response message to the Visited MME or Visited SGSN, carrying the FQDN of the Home PGW.
  • the Visited MME or Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or the Visited SGSN sends a request message to the HSS, and notifies the HSS of the FQDN association relationship between the APN and the Home PGW.
  • the UE when the UE moves to the non-3GPP, the UE acquires the PGW information of the activated PDN connection from the HSS.
  • the Visited MME carries the FQDN of the Home PGW when sending the message to the Home MME; the Home MME selects the Home SGW closest to the Home PGW topology according to the FQDN of the Home PGW. Therefore, after the UE returns to the HPLMN, the Home MME cannot select the SGW problem that is closest to the PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • the foregoing solution overcomes the problem that the MME cannot obtain the FQDN information of the PGW (Home PGW) actually accessed when the Proxy PGW is used in the related art, and obtains the true UE when the roaming user uses the proxy PGW to return to the local access.
  • the FQDN of the Home PGW that is accessed, so that when the proxy PGW is used, the handover between the 3GPP and the non-3GPP can also be supported, thereby improving the user experience.
  • the Home MME can also select the SGW that has the closest PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • the UE requests the originating PDN connection establishment procedure from the UE, the UE initiates the PDN connection setup process, the UE performs the first activation process in the GERAN/UTRAN, and the UE returns to the HPLMN process, refer to the foregoing embodiment. , will not repeat them here.
  • an embodiment of the present invention provides a Home PGW for acquiring a PGW FQDN, including: a receiving module 901 and a sending module 902, where:
  • the receiving module 901 is configured to: when the UE accesses the home location through the proxy PGW and performs data service, the receiving proxy PGW forwards the create session request from the Visited MME. interest;
  • the sending module 902 is configured to: after the receiving module receives the create session request message, return a create session response message to the Visited MME or the Visited SGSN through the Visited SGW; the create session response message carries the FQDN of the Home PGW .
  • the solution of the embodiment of the present invention is applicable to a scenario in which a Proxy PGW is adopted.
  • the Visited MME sends a create session request message to the proxy PGW through the Visited SGW, and the proxy PGW forwards the create session request message to the The Home PGW of the UE.
  • the data service includes at least one of the following: the UE requests the Visited MME to initiate a PDN connection establishment process; the UE initiates an attach procedure under LTE; the UE activates the process for the first time under GERAN or UTRAN; and the UE returns to the HPLMN process.
  • the Home PGW After receiving the Create Session Request message, the Home PGW directly returns a Create Session Response message to the Visited SGW, and carries the FQDN of the Home PGW in the Session Response message.
  • the Visited SGW returns a Create Session Response message to the Visited MME or Visited SGSN, carrying the FQDN of the Home PGW.
  • the Visited MME or Visited SGSN saves the FQDN of the Home PGW in the Create Session Response message.
  • the Visited MME or the Visited SGSN sends a request message to the HSS, and notifies the HSS of the FQDN association relationship between the APN and the Home PGW.
  • the UE when the UE moves to the non-3GPP, the UE acquires the PGW information of the activated PDN connection from the HSS.
  • the Visited MME carries the FQDN of the Home PGW when sending the message to the Home MME; the Home MME selects the Home SGW closest to the Home PGW topology according to the FQDN of the Home PGW. Therefore, after the UE returns to the HPLMN, the Home MME cannot select the SGW problem that is closest to the PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • This embodiment overcomes the related art in the related art when the MME is not used when using the Proxy PGW.
  • Switching between 3GPP and non-3GPP improves user experience.
  • the Home MME can also select the SGW that has the closest PGW topology relationship that the UE actually accesses, thereby saving network resources.
  • the UE requests the originating PDN connection establishment procedure from the UE, the UE initiates the PDN connection setup process, the UE performs the first activation process in the GERAN/UTRAN, and the UE returns to the HPLMN process, refer to the foregoing embodiment. , will not repeat them here.
  • the FQDN of the Home PGW that the UE actually accesses is obtained, so that when the proxy PGW is used, the handover between the 3GPP and the non-3GPP is supported, and the user experience is improved.

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Abstract

本发明实施例涉及一种获取PGW FQDN的方法、Home PGW及系统，其方法包括：当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，Home PGW在接收到创建会话请求消息后，向Visited MME或Visited SGSN返回携带有Home PGW的FQDN的创建会话响应消息；Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。

Description

获取PGW FQDN的方法、Home PGW及系统 技术领域
本文涉及通讯技术领域，尤其涉及漫游用户使用代理PGW(Packet Data Network Gateway，分组数据网网关)回归属地接入时的一种获取PGW FQDN(Fully Qualified Domain Name，完全限定域名)的方法、Home PGW及系统。
背景技术
目前，3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)对下一代移动无线网络的项目称为SAE(System Architecture Evolution，系统架构演进)。SAE的架构如图1所示，其中包含了如下网元：
E-RAN(Evolved RAN，演进的无线接入网)，可以提供更高的上下行速率，更低的传输延迟和更加可靠的无线传输。E-RAN中包含的网元是eNodeB(Evolved NodeB,演进型基站)，为终端的接入提供无线资源。
HSS(Home Subscriber Server，归属用户服务器)，永久存储用户签约数据。
MME(Mobility Management Entity，移动管理实体)：控制面功能实体，临时存储用户数据的服务器，负责管理和存储UE(User Equipment，用户设备)上下文(比如UE/用户标识、移动性管理状态、用户安全参数等)，为用户分配临时标识，当UE驻扎在该跟踪区域时，负责对该用户进行鉴权；处理MME和UE之间的所有非接入层消息；触发在SAE的寻呼。
SGW(Serving GW，服务网关)，该网关是一个用户面实体，负责用户面数据路由处理，终结处于空闲状态的UE的下行数据。管理和存储UE的SAE承载(bearer)上下文，比如IP承载业务参数和网络内部路由信息等。SGW是3GPP系统内部用户面的锚点，一个用户在一个时刻只能有一个Serving GW；
PGW(Packet Data Network Gateway，分组数据网网关)，负责UE接入PDN(Packet Data Network，分组数据网络)的网关，分配用户IP地址，同 时是3GPP和非3GPP接入系统的移动性锚点。用户在同一时刻能够接入多个PDN GW。
PCRF(Policy and Charging Rule Functionality，策略和计费规则功能实体)，该功能实体主要根据业务信息和用户签约信息以及运营商的配置信息产生控制用户数据传递的Qos(Quality of Service，服务质量)规则以及计费规则。该功能实体也可以控制接入网中承载的建立和释放。
SGSN(Serving GPRS Support Node，正在服务的GPRS(General Packet Radio Service，通用分组无线服务)支持节点)：临时存储用户数据的服务器，负责管理和存储UE相关信息，如UE/用户标识、移动性管理状态、用户安全参数等，为用户分配临时标识，完成用户安全功能，完成用户移动性管理功能和会话管理功能，处理SGSN和UE之间的所有非接入层消息。
UTRAN(UMTS Terrestrial Radio Access Network，统一的陆地无线接入网络)：第三代移动通讯网络(3G)的无线接入网络，为终端的接入提供无线资源。
GERAN(GSM EDGE Radio Access Network，GSM/EDGE无线接入网)：GPRS/EDGE的无线接入网络，为终端的接入提供无线资源。
下一代移动网络作为一种广泛使用的移动通信技术，该系统能支持用户在不同的地区和国家的移动网络之间的漫游业务，也能支持用户在不同接入方式下访问业务，包括3GPP接入和非3GPP接入。
相关技术中，可以利用代理PGW(Proxy PGW)技术实现漫游用户接入到归属地，并进行数据业务。具体地，UE从归属公众陆地移动通信网络(HPLMN，Public Land Mobile-communication Network)漫游到拜访地(漫游地)PLMN(Visited PLMN)后，附着到Visited PLMN的MME(Visited MME)上，由所述Visited MME发送创建会话请求给代理PGW，然后由代理PGW转发创建会话请求到UE归属地的PGW(Home PGW)，之后，由所述Visited MME和Home PGW进行后续的PS(Packet Switch，分组交换)业务。
但是，按目前技术，Visited MME没有获取到Home PGW的FQDN，后续通知HSS的PGW FQDN为Proxy PGW的FQDN，即不是UE真实接入的 PGW。之后如果UE切换到非3GPP，因为PGW是3GPP和非3GPP接入系统的移动性锚点，在非3GPP接入下，从HSS无法获取UE真实接入的PGW FQDN，因此切换会失败，导致严重影响用户对业务的体验。
另外，Visited MME没有获取到UE真实接入的PGW，后续UE回到HPLMN后，Home MME也无法选择和UE真实接入的PGW拓扑关系最近的SGW，从而浪费了网络资源。
发明内容
本发明实施例提供一种获取PGW FQDN的方法、Home PGW及系统，能够克服相关技术中在使用Proxy PGW时无法获取实际接入的PGW(Home PGW)的FQDN信息，导致3GPP和非3GPP间的互切失败的问题。
本发明实施例提出一种获取PGW FQDN的方法，包括：
当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，Home PGW接收代理PGW转发的来自Visited MME的创建会话请求消息；
通过Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN。
可选地，所述数据业务包括以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在长期演进LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
本发明实施例还提出一种获取PGW FQDN的Home PGW，包括：
接收模块，设置为当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，接收代理PGW转发的来自Visited MME的创建会话请求消息；
发送模块，设置为通过Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN。
本发明实施例还提出一种获取分组数据网网关PGW完全限定域名FQDN的方法，包括：
当用户设备UE通过代理PGW从漫游地接入到归属地并进行数据业务时，所述归属地Home PGW在收到所述创建会话请求消息后，向漫游地移动管理实体Visited MME或漫游地正在服务的通用分组无线服务GPRS支持节点Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN；
所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
可选地，所述Home PGW在收到所述创建会话请求消息之前，所述方法还包括：
当备UE通过代理PGW从漫游地接入到归属地并进行数据业务时，所述Visited MME或者Visited SGSN通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述Home PGW。
可选地，该方法还包括：
如果UE支持到非3GPP接入的切换，Visited MME或Visited SGSN则向归属用户服务器HSS发送请求消息，将接入点名APN和所述UE真实接入的PGW的FQDN关联关系通知给HSS；所述PGW的FQDN为Home PGW在创建会话响应消息中携带的Home PGW的FQDN。
可选地，该方法还包括：
当所述UE移动到非3GPP时，所述HSS向非3GPP系统提供已激活PDN连接的APN和PGW FQDN信息，所述APN和PGW FQDN是由Visited MME或Visited SGSN通知给HSS的APN和PGW FQDN。
可选地，所述数据业务包括以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
可选地，该方法还包括：
当所述UE回到HPLMN时，所述Visited MME向Home MME发送消息时，携带Home PGW的FQDN；
所述Home MME根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。
本发明实施例还提出一种获取PGW FQDN的系统，包括：Visited MME或Visited SGSN，以及Home PGW；其中：
所述Home PGW，设置为当用户设备UE通过代理PGW从漫游地接入到归属地并进行数据业务时，在收到所述创建会话请求消息后，向Visited MME或Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN；
所述Visited MME或Visited SGSN，设置为保存创建会话响应消息中Home PGW的FQDN。
可选地，所述Visited MME或Visited SGSN，还设置为当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW；
所述Home PGW，还设置为在收到所述创建会话请求消息后，通过所述Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息。
可选地，该系统还包括HSS；
Visited MME或Visited SGSN，还设置为在UE支持到非3GPP接入的切换时，向HSS发送请求消息，将APN和所述UE真实接入的PGW的FQDN关联关系通知给HSS；所述PGW的FQDN为Home PGW在创建会话响应消息中携带的Home PGW的FQDN。
可选地，所述HSS，设置为当所述UE移动到非3GPP时，向非3GPP系统提供已激活PDN连接的APN和PGW FQDN信息，所述APN和PGW FQDN是由Visited MME或Visited SGSN通知给HSS的APN和PGW FQDN。
可选地，所述数据业务包括以下至少之一：UE向Visited MME请求发起 PDN连接建立过程；UE在LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
可选地，该系统还包括：Home MME；
所述Visited MME，还设置为当所述UE回到HPLMN时，向Home MME发送消息时，携带Home PGW的FQDN；
所述Home MME，设置为根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。
本发明实施例提出的一种获取PGW FQDN的方法、Home PGW及系统，克服了相关技术中在使用Proxy PGW时MME无法获取实际接入的PGW(Home PGW)的FQDN信息的问题，在漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN，从而在使用代理PGW时，也能支持3GPP和非3GPP间的切换，提高用户业务感受。并且，在UE回到HPLMN后，Home MME也可以选择和UE真实接入的PGW拓扑关系最近的SGW，节省了网络资源。
附图概述
图1是相关技术中SAE架构示意图；
图2是相关技术中使用Proxy PGW技术实现漫游用户接入归属地的流程示意图；
图3a是获取PGW FQDN的方法一实施例的流程示意图；
图3b是获取PGW FQDN的方法另一实施例的流程示意图；
图4是采用代理Proxy PGW时UE请求的PDN连接建立过程的一个实施例流程示意图；
图5是采用Proxy PGW时UE在LTE(Long Term Evolution，长期演进)下开机附着过程的一个实施例流程示意图；
图6是采用Proxy PGW时UE在GERAN/UTRAN下首次激活过程的一 个实施例流程示意图；
图7是采用Proxy PGW时UE又回到HPLMN过程的一个实施例流程示意图；
图8是获取PGW FQDN的方法另一实施例的流程示意图；
图9是获取PGW FQDN的Home PGW一实施例功能模块示意图。
本发明的实施方式
本文涉及移动通讯系统中分组域演进域领域，涉及漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN的方法和系统，从而在使用代理PGW时，也能支持3GPP和非3GPP间的切换。
本发明实施例的解决方案主要是：当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，Visited MME通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW；Home PGW收到创建会话请求消息后，通过Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息；创建会话响应消息携带有所述Home PGW的FQDN；Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。由此实现在使用代理PGW时MME能够获取实际接入的PGW(Home PGW)的FQDN信息，支持3GPP和非3GPP间的切换，提高用户业务感受。
如图2所示，图2为相关技术中典型的利用代理PGW技术实现漫游用户接入归属地，并进行PS业务的方法流程示意图，如图2所示，该方法包括以下步骤：
步骤201，漫游用户向漫游地的MME(Visited MME)发起PDN连接建立；
步骤202，Visited MME发起域名系统(DNS，Domain Name System)解析流程，解析Proxy PGW的控制面地址；
步骤203，DNS服务器向Visited MME返回Proxy PGW的控制面地址和FQDN(Fully Qualified Domain Name，完全限定域名)；
步骤204，Visited MME向Visited SGW发送创建会话请求消息，携带Proxy PGW的控制面地址；
步骤205，Visited SGW向Proxy PGW发送创建会话请求消息；
步骤206，Proxy PGW收到创建会话请求消息后，对报文进行解析，得到用户标识信息，Proxy PGW根据此信息翻译出用户签约归属地的PGW(Home PGW)地址；
这里，所述用户标识信息可以是移动用户国际号码(MSISDN，Mobile Station Integrated Services Digital Network)或国际移动用户识别码(IMSI，International Mobile Subscriber Identification Number)。
步骤207，Proxy PGW将创建会话请求消息中的IP包的目的IP地址，修改为MSISDN或IMSI对应的Home PGW的地址，把修改后的创建会话请求消息发送给Home PGW；
步骤208，Home PGW收到创建会话请求消息后，直接向Visited SGW返回创建会话响应，携带Home PGW的IP地址，但不会携带Home PGW的FQDN；
步骤209，Visited SGW返回创建会话响应给Visited MME，携带Home PGW的IP地址，但不会携带Home PGW的FQDN；
步骤210，Visited MME给eNodeB发送承载建立请求消息，该消息中携带给UE的激活默认EPS承载上下文请求消息；
步骤211，eNodeB给UE发送RRC连接重新配置消息，该消息中携带给UE的激活默认EPS承载上下文请求消息；
步骤212，UE给eNodeB返回RRC连接重新配置完成消息；
步骤213，eNodeB给Visited MME返回承载建立响应消息；
步骤214，UE给Visited MME发送激活默认EPS承载上下文接受消息；
步骤215，Visited MME向Visited SGW发送修改承载请求消息；
步骤216，Visited SGW返回修改承载响应给Visited MME；
步骤217，如果该用户支持到非3GPP接入的切换，Visited MME向HSS 发送通知请求，把APN(Access Point Name，接入点名)和PGW FQDN关联关系通知给HSS，PGW FQDN为根据DNS查询到的Proxy PGW的FQDN；
这里，后续UE移动到非3GPP时，向HSS要已激活PDN连接的PGW信息。
步骤218，HSS存储APN和PGW FQDN关联关系，给Visited MME回通知响应消息。
由上述过程可知，相关技术方案中，Visited MME没有获取到Home PGW的FQDN，后续通知HSS的PGW FQDN为Proxy PGW的FQDN，即不是UE真实接入的PGW。之后如果UE切换到非3GPP，因为PGW是3GPP和非3GPP接入系统的移动性锚点，在非3GPP接入下从HSS无法获取UE真实接入的PGW FQDN，因此切换会失败，导致严重影响用户对业务的体验。
另外，Visited MME没有获取到UE真实接入的PGW，后续UE回到HPLMN后，Home MME也无法选择和UE真实接入的PGW拓扑关系最近的SGW。
本发明实施例方案，可以克服相关技术中在使用Proxy PGW时MME无法获取实际接入的PGW(Home PGW)的FQDN信息，导致和非3GPP间的互切失败的问题，并且，在UE回到HPLMN后，Home MME也可以选择和UE真实接入的PGW拓扑关系最近的SGW，节省了网络资源。
如图3a所示，本发明一实施例提出一种获取PGW FQDN的方法，
步骤S302，Home PGW收到创建会话请求消息后，向Visited MME或Visited SGSN返回创建会话响应消息，所述创建会话响应消息携带有所述Home PGW的FQDN；
本实施例方案系统运行环境涉及UE、Visited MME、Proxy PGW、Home PGW、Visited SGW、Visited SGSN、HSS、Home MME等。
本发明实施例方案适用于采用Proxy PGW的场景。
首先，漫游UE通过代理PGW从漫游地接入到归属地并进行数据业务时， Visited MME通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW。
其中，所述数据业务包括但不限于以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
Home PGW在收到创建会话请求消息后，直接向Visited SGW返回创建会话响应消息，并在该会话响应消息中携带Home PGW的FQDN。
Visited SGW返回创建会话响应消息给Visited MME或Visited SGSN，携带Home PGW的FQDN。
步骤S303，所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
可选地，后续处理过程中，如果UE支持到非3GPP接入的切换，Visited MME或Visited SGSN则向HSS发送请求消息，将APN和用户真实接入的PGW的FQDN关联关系通知给HSS；所述PGW的FQDN为Home PGW在创建会话响应消息中携带的Home PGW的FQDN。
可选地，该方案中，后续当UE移动到非3GPP时，HSS向非3GPP系统提供已激活PDN连接的APN和PGW FQDN信息，所述APN和PGW FQDN是由Visited MME或Visited SGSN通知给HSS的APN和PGW FQDN。
可选地，后续当所述UE回到HPLMN时，所述Visited MME向Home MME发送消息时，携带Home PGW的FQDN；Home MME根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。从而解决了UE回到HPLMN后，Home MME无法选择和UE真实接入的PGW拓扑关系最近的SGW问题，节省了网络资源。
本实施例通过上述方案，克服了相关技术中在使用Proxy PGW时MME无法获取实际接入的PGW(Home PGW)的FQDN信息的问题，在漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN， 从而在使用代理PGW时，也能支持3GPP和非3GPP间的切换，提高用户业务感受。并且，在UE回到HPLMN后，Home MME也可以选择和UE真实接入的PGW拓扑关系最近的SGW，节省了网络资源。
如图3b所示，本发明另一实施例提出一种获取PGW FQDN的方法，包括：
步骤S301，当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，Visited MME或者Visited SGSN通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW；
本实施例方案系统运行环境涉及UE、Visited MME、Proxy PGW、Home PGW、Visited SGW、Visited SGSN、HSS、Home MME等。
本发明实施例方案适用于采用Proxy PGW的场景。
首先，漫游UE通过代理PGW从漫游地接入到归属地并进行数据业务时，Visited MME通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW。
其中，所述数据业务包括但不限于以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
步骤S302，所述Home PGW收到所述创建会话请求消息后，通过所述Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN；
Home PGW收到创建会话请求消息后，直接向Visited SGW返回创建会话响应消息，并在该会话响应消息中携带Home PGW的FQDN。
Visited SGW返回创建会话响应消息给Visited MME或Visited SGSN，携带Home PGW的FQDN。
步骤S303，所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
可选地，后续处理过程中，如果UE支持到非3GPP接入的切换，Visited MME或Visited SGSN则向HSS发送请求消息，将APN和用户真实接入的PGW的FQDN关联关系通知给HSS；所述PGW的FQDN为Home PGW在创建会话响应消息中携带的Home PGW的FQDN。
可选地，该方案中，后续当UE移动到非3GPP时，HSS向非3GPP系统提供已激活PDN连接的APN和PGW FQDN信息，所述APN和PGW FQDN是由Visited MME或Visited SGSN通知给HSS的APN和PGW FQDN。
可选地，后续当所述UE回到HPLMN时，所述Visited MME向Home MME发送消息时，携带Home PGW的FQDN；Home MME根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。从而解决了UE回到HPLMN后，Home MME无法选择和UE真实接入的PGW拓扑关系最近的SGW问题，节省了网络资源。
本实施例通过上述方案，克服了相关技术中在使用Proxy PGW时MME无法获取实际接入的PGW(Home PGW)的FQDN信息的问题，在漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN，从而在使用代理PGW时，也能支持3GPP和非3GPP间的切换，提高用户业务感受。并且，在UE回到HPLMN后，Home MME也可以选择和UE真实接入的PGW拓扑关系最近的SGW，节省了网络资源。
以下分别描述UE向Visited MME请求发起PDN连接建立过程、UE在LTE下开机附着过程、UE在GERAN/UTRAN下首次激活过程、UE回到HPLMN过程中数据业务处理流程：
如图4所示，是采用Proxy PGW时UE请求的PDN连接建立过程中的实施例，包括以下步骤：
步骤401，漫游用户向漫游地的MME(Visited MME)发起PDN连接建立；
步骤402，Visited MME发起域名系统(DNS，Domain Name System)解析 流程，解析Proxy PGW的控制面地址；
步骤403，DNS服务器向Visited MME返回Proxy PGW的控制面地址和FQDN；
步骤404，Visited MME向Visited SGW发送创建会话请求消息，携带Proxy PGW的控制面地址；
步骤405，Visited SGW向Proxy PGW发送创建会话请求消息；
步骤406，Proxy PGW收到创建会话请求消息后，对报文进行解析，得到用户标识信息，Proxy PGW根据此信息翻译出用户签约归属地的PGW(Home PGW)地址；
这里，所述用户标识信息可以是移动用户国际号码(MSISDN，Mobile Station Integrated Services Digital Network)或国际移动用户识别码(IMSI，International Mobile Subscriber Identification Number)。
步骤407，Proxy PGW将创建会话请求消息中的IP包的目的IP地址，修改为MSISDN或IMSI对应的Home PGW的地址，把修改后的创建会话请求消息发送给Home PGW；
步骤408，Home PGW收到创建会话请求消息后，直接向Visited SGW返回创建会话响应，携带Home PGW的IP地址，同时也携带Home PGW的FQDN；
步骤409，Visited SGW返回创建会话响应给Visited MME，携带Home PGW的IP地址，同时也携带Home PGW的FQDN；
步骤410，Visited MME保存Home PGW的FQDN；
步骤411，Visited MME给eNodeB发送承载建立请求消息，该消息中携带给UE的激活默认EPS承载上下文请求消息；
步骤412，eNodeB给UE发送RRC连接重新配置消息，该消息中携带给UE的激活默认EPS承载上下文请求消息；
步骤413，UE给eNodeB返回RRC连接重新配置完成消息；
步骤414，eNodeB给Visited MME返回承载建立响应消息；
步骤415，UE给Visited MME发送激活默认EPS承载上下文接受消息；
步骤416，Visited MME向Visited SGW发送修改承载请求消息；
步骤417，Visited SGW返回修改承载响应给Visited MME；
步骤418，如果该用户支持到非3GPP接入的切换，Visited MME向HSS发送通知请求，把APN和PGW FQDN关联关系通知给HSS，PGW FQDN为根据DNS查询到的Proxy PGW的FQDN；
这里，后续UE移动到非3GPP时，向HSS要已激活PDN连接的PGW信息。
步骤419，HSS存储APN和PGW FQDN关联关系，给Visited MME回通知响应消息。
如图5所示，是采用Proxy PGW时UE在LTE(Long Term Evolution，长期演进)下开机附着过程中的实施例，包括：
步骤501，漫游用户向漫游地的MME(Visited MME)发起附着；
步骤502，Visited MME完成对UE的鉴权和安全功能；
步骤503，Visited MME向HSS发送位置更新消息，获取用户签约信息；
步骤504，HSS向Visited MME返回位置更新确认消息；
步骤505，Visited MME发起域名系统(DNS，Domain Name System)解析流程，解析Proxy PGW的控制面地址；
步骤506，DNS服务器向Visited MME返回Proxy PGW的控制面地址和FQDN；
步骤507，Visited MME向Visited SGW发送创建会话请求消息，携带Proxy PGW的控制面地址；
步骤508，Visited SGW向Proxy PGW发送创建会话请求消息；
步骤509，Proxy PGW收到创建会话请求消息后，对报文进行解析，得到用户标识信息，Proxy PGW根据此信息翻译出用户签约归属地的PGW(Home PGW)地址；
这里，所述用户标识信息可以是移动用户国际号码(MSISDN，Mobile Station Integrated Services Digital Network)或国际移动用户识别码(IMSI，International Mobile Subscriber Identification Number)。
步骤510，Proxy PGW将创建会话请求消息中的IP包的目的IP地址，修改为MSISDN或IMSI对应的Home PGW的地址，把修改后的创建会话请求消息发送给Home PGW；
步骤511，Home PGW收到创建会话请求消息后，直接向Visited SGW返回创建会话响应，携带Home PGW的IP地址，同时也携带Home PGW的FQDN；
步骤512，Visited SGW返回创建会话响应给Visited MME，携带Home PGW的IP地址，同时也携带Home PGW的FQDN；
步骤513，Visited MME保存Home PGW的FQDN；
步骤514，Visited MME给eNodeB发送初始上下文建立请求消息，该消息中携带给UE的附着接受和激活默认EPS承载上下文请求消息；
步骤515，eNodeB给UE发送RRC连接重新配置消息，该消息中携带给UE的附着接受和激活默认EPS承载上下文请求消息；
步骤516，UE给eNodeB返回RRC连接重新配置完成消息；
步骤517，eNodeB给Visited MME返回初始上下文建立响应消息；
步骤518，UE给Visited MME发送附着完成和激活默认EPS承载上下文接受消息；
步骤519，Visited MME向Visited SGW发送修改承载请求消息；
步骤520，Visited SGW返回修改承载响应给Visited MME；
步骤521，如果该用户支持到非3GPP接入的切换，Visited MME向HSS发送通知请求，把APN和PGW FQDN关联关系通知给HSS，PGW FQDN为根据DNS查询到的Proxy PGW的FQDN；
这里，后续UE移动到非3GPP时，向HSS要已激活PDN连接的PGW信息。
步骤522，HSS存储APN和PGW FQDN关联关系，给Visited MME回通知响应消息。
如图6所示，是采用Proxy PGW时UE在GERAN/UTRAN下首次激活过程中的实施例，包括：
步骤601，漫游用户向漫游地的SGSN(Visited SGSN)发起激活PDP上下文请求；
步骤602，Visited SGSN发起域名系统(DNS，Domain Name System)解析流程，解析Proxy PGW的控制面地址；
步骤603，DNS服务器向Visited SGSN返回Proxy PGW的控制面地址和FQDN；
步骤604，Visited SGSN确定使用S4接口，向Visited SGW发送创建会话请求消息，携带Proxy PGW的控制面地址；
步骤605，Visited SGW向Proxy PGW发送创建会话请求消息；
步骤606，Proxy PGW收到创建会话请求消息后，对报文进行解析，得到用户标识信息，Proxy PGW根据此信息翻译出用户签约归属地的PGW(Home PGW)地址；
这里，所述用户标识信息可以是移动用户国际号码(MSISDN，Mobile Station Integrated Services Digital Network)或国际移动用户识别码(IMSI，International Mobile Subscriber Identification Number)。
步骤607，Proxy PGW将创建会话请求消息中的IP包的目的IP地址，修改为MSISDN或IMSI对应的Home PGW的地址，把修改后的创建会话请求消息发送给Home PGW；
步骤608，Home PGW收到创建会话请求消息后，直接向Visited SGW返回创建会话响应，携带Home PGW的IP地址，同时也携带Home PGW的FQDN；
步骤609，Visited SGW返回创建会话响应给Visited SGSN，携带Home PGW的IP地址，同时也携带Home PGW的FQDN；
步骤610，Visited SGSN保存Home PGW的FQDN；
步骤611，如果是UTRAN接入，Visited SGSN给UTRAN发送RAB指派请求消息；
步骤612，UTRAN给UE发送RRC连接重新配置消息；
步骤613，UE给UTRAN返回RRC连接重新配置完成消息；
步骤614，UTRAN给Visited SGSN返回RAB指派响应消息；
步骤615，如果该PDP使用了单隧道，Visited SGSN向Visited SGW发送修改承载请求消息；
步骤616，Visited SGW返回修改承载响应给Visited SGSN；
步骤617，如果该用户支持到非3GPP接入的切换，Visited SGSN向HSS发送通知请求，把APN和PGW FQDN关联关系通知给HSS，PGW FQDN为根据DNS查询到的Proxy PGW的FQDN；
这里，后续UE移动到非3GPP时，向HSS要已激活PDN连接的PGW信息。
步骤618，HSS存储APN和PGW FQDN关联关系，给Visited SGSN回通知响应消息；
步骤619，Visited SGSN给UE发送激活PDP上下文接受消息；
如图7所示，是采用Proxy PGW时UE又回到HPLMN过程中的实施例，包括：
步骤701，漫游用户向漫游地的MME(Visited MME)通过Proxy PGW已完成附着；
步骤702，用户向归属地的MME(Home MME)发起跟踪区更新请求消息；
步骤703，Home MME向Visited MME发送上下文请求消息；
步骤704，Visited MME向Home MME返回上下文响应消息，携带Home PGW的FQDN；
步骤705，Home MME完成对UE的鉴权和安全功能；
步骤706，Home MME向Visited MME返回上下文确认消息；
步骤707，Home MME发起域名系统(DNS，Domain Name System)解析流程，解析Home SGW的控制面地址；
步骤708，DNS服务器向Home MME返回Home SGW的控制面地址和FQDN；
步骤709，Home MME根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW；
步骤710，继续执行跟踪区更新流程。
由上述业务处理过程可知，本实施例方案克服了相关技术中在使用Proxy PGW时MME无法获取实际接入的PGW(Home PGW)的FQDN信息的问题，在漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN，从而在使用代理PGW时，也能支持3GPP和非3GPP间的切换，提高用户业务感受。并且，在UE回到HPLMN后，Home MME也可以选择和UE真实接入的PGW拓扑关系最近的SGW，节省了网络资源。
此外，本发明实施例还提出一种获取PGW FQDN的系统，包括：Visited MME、代理PGW、Home PGW、Visited SGW、Visited SGSN、HSS、Home MME等；其中：
所述Visited MME，设置为当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW；
所述Home PGW，设置为在收到所述创建会话请求消息后，通过所述Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN；
所述Visited MME或Visited SGSN，设置为保存创建会话响应消息中Home PGW的FQDN。
可选地，Visited MME或Visited SGSN，还设置为在UE支持到非3GPP 接入的切换时，向HSS发送请求消息，将APN和Home PGW的FQDN关联关系通知给HSS。
所述HSS，设置为当所述UE移动到非3GPP时，向UE提供已激活PDN连接的PGW信息。
所述Visited MME，还设置为当所述UE回到HPLMN时，向Home MME发送消息时，携带Home PGW的FQDN；
所述Home MME，设置为根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。
其中，本发明实施例方案适用于采用Proxy PGW的场景。
首先，漫游UE通过代理PGW从漫游地接入到归属地并进行数据业务时，Visited MME通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW。
其中，所述数据业务包括以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
Home PGW收到创建会话请求消息后，直接向Visited SGW返回创建会话响应消息，并在该会话响应消息中携带Home PGW的FQDN。
Visited SGW返回创建会话响应消息给Visited MME或Visited SGSN，携带Home PGW的FQDN。
所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
可选地，后续处理过程中，如果UE支持到非3GPP接入的切换，Visited MME或Visited SGSN则向HSS发送请求消息，将APN和Home PGW的FQDN关联关系通知给HSS。
可选地，该方案中，后续当UE移动到非3GPP时，UE从HSS获取已激活PDN连接的PGW信息。
可选地，后续当所述UE回到HPLMN时，所述Visited MME向Home MME发送消息时，携带Home PGW的FQDN；Home MME根据Home PGW 的FQDN，选择和Home PGW拓扑最近的Home SGW。从而解决了UE回到HPLMN后，Home MME无法选择和UE真实接入的PGW拓扑关系最近的SGW问题，节省了网络资源。
本实施例通过上方案，克服了相关技术中在使用Proxy PGW时MME无法获取实际接入的PGW(Home PGW)的FQDN信息的问题，在漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN，从而在使用代理PGW时，也能支持3GPP和非3GPP间的切换，提高用户业务感受。并且，在UE回到HPLMN后，Home MME也可以选择和UE真实接入的PGW拓扑关系最近的SGW，节省了网络资源。
本实施例中关于UE向Visited MME请求发起PDN连接建立过程、UE在LTE下开机附着过程、UE在GERAN/UTRAN下首次激活过程、UE回到HPLMN过程中数据业务处理流程，请参照上述实施例，在此不再赘述。
如图8所示，本发明另一实施例提出一种获取PGW FQDN的方法，包括：
步骤S801，当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，所述Home PGW接收代理PGW转发的来自Visited MME的创建会话请求消息；
步骤S802，通过Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN。
其中，本发明实施例方案适用于采用Proxy PGW的场景。
首先，漫游UE通过代理PGW从漫游地接入到归属地并进行数据业务时，Visited MME通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW。
其中，所述数据业务包括以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
Home PGW收到创建会话请求消息后，直接向Visited SGW返回创建会话响应消息，并在该会话响应消息中携带Home PGW的FQDN。
Visited SGW返回创建会话响应消息给Visited MME或Visited SGSN，携带Home PGW的FQDN。
所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
可选地，后续处理过程中，如果UE支持到非3GPP接入的切换，Visited MME或Visited SGSN则向HSS发送请求消息，将APN和Home PGW的FQDN关联关系通知给HSS。
可选地，该方案中，后续当UE移动到非3GPP时，UE从HSS获取已激活PDN连接的PGW信息。
可选地，后续当所述UE回到HPLMN时，所述Visited MME向Home MME发送消息时，携带Home PGW的FQDN；Home MME根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。从而解决了UE回到HPLMN后，Home MME无法选择和UE真实接入的PGW拓扑关系最近的SGW问题，节省了网络资源。
本实施例通过上述方案，克服了相关技术中在使用Proxy PGW时MME无法获取实际接入的PGW(Home PGW)的FQDN信息的问题，在漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN，从而在使用代理PGW时，也能支持3GPP和非3GPP间的切换，提高用户业务感受。并且，在UE回到HPLMN后，Home MME也可以选择和UE真实接入的PGW拓扑关系最近的SGW，节省了网络资源。
本实施例中关于UE向Visited MME请求发起PDN连接建立过程、UE在LTE下开机附着过程、UE在GERAN/UTRAN下首次激活过程、UE回到HPLMN过程中数据业务处理流程，请参照上述实施例，在此不再赘述。
如图9所示，本发明一实施例提出一种获取PGW FQDN的Home PGW，包括：接收模块901及发送模块902，其中：
接收模块901，设置为当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，接收代理PGW转发的来自Visited MME的创建会话请求消 息；
发送模块902，设置为在所述接收模块收到所述创建会话请求消息后，通过Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN。
本发明实施例方案适用于采用Proxy PGW的场景。
首先，漫游UE通过代理PGW从漫游地接入到归属地并进行数据业务时，Visited MME通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW。
其中，所述数据业务包括以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
Home PGW收到创建会话请求消息后，直接向Visited SGW返回创建会话响应消息，并在该会话响应消息中携带Home PGW的FQDN。
Visited SGW返回创建会话响应消息给Visited MME或Visited SGSN，携带Home PGW的FQDN。
所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
可选地，后续处理过程中，如果UE支持到非3GPP接入的切换，Visited MME或Visited SGSN则向HSS发送请求消息，将APN和Home PGW的FQDN关联关系通知给HSS。
可选地，该方案中，后续当UE移动到非3GPP时，UE从HSS获取已激活PDN连接的PGW信息。
可选地，后续当所述UE回到HPLMN时，所述Visited MME向Home MME发送消息时，携带Home PGW的FQDN；Home MME根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。从而解决了UE回到HPLMN后，Home MME无法选择和UE真实接入的PGW拓扑关系最近的SGW问题，节省了网络资源。
本实施例通过上方案，克服了相关技术中在使用Proxy PGW时MME无 法获取实际接入的PGW(Home PGW)的FQDN信息的问题，在漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN，从而在使用代理PGW时，也能支持3GPP和非3GPP间的切换，提高用户业务感受。并且，在UE回到HPLMN后，Home MME也可以选择和UE真实接入的PGW拓扑关系最近的SGW，节省了网络资源。
本实施例中关于UE向Visited MME请求发起PDN连接建立过程、UE在LTE下开机附着过程、UE在GERAN/UTRAN下首次激活过程、UE回到HPLMN过程中数据业务处理流程，请参照上述实施例，在此不再赘述。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，上述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本发明实施例不限制于任何特定形式的硬件和软件的结合。
工业实用性
本发明实施例能够在漫游用户使用代理PGW回归属地接入时，获取UE真实接入的Home PGW的FQDN，从而在使用代理PGW时，支持3GPP和非3GPP间的切换，提高用户业务感受。

Claims (15)

  1. 一种获取分组数据网网关PGW完全限定域名FQDN的方法，包括：
    当用户设备UE通过代理PGW从漫游地接入到归属地并进行数据业务时，所述归属地分组数据网网关Home PGW接收代理PGW转发的来自漫游地移动管理实体Visited MME的创建会话请求消息；
    通过漫游地服务网关Visited SGW向Visited MME或漫游地正在服务的通用分组无线服务GPRS支持节点Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN。
  2. 根据权利要求1所述的方法，其中，所述数据业务包括以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在长期演进LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
  3. 一种获取分组数据网网关PGW完全限定域名FQDN的归属地分组数据网网关Home PGW，包括：
    接收模块，设置为当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，接收代理PGW转发的来自漫游地移动管理实体Visited MME的创建会话请求消息；
    发送模块，设置为通过漫游地服务网关Visited SGW向Visited MME或漫游地正在服务的通用分组无线服务GPRS支持节点Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN。
  4. 一种获取分组数据网网关PGW完全限定域名FQDN的方法，包括：
    当用户设备UE通过代理PGW从漫游地接入到归属地并进行数据业务时，所述归属地分组数据网网关Home PGW在收到所述创建会话请求消息后，向漫游地移动管理实体Visited MME或漫游地正在服务的通用分组无线服务GPRS支持节点Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN；
    所述Visited MME或Visited SGSN保存创建会话响应消息中Home PGW的FQDN。
  5. 根据权利要求4所述的方法，所述Home PGW在收到所述创建会话请求消息之前，所述方法还包括：
    当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，所述Visited MME或者Visited SGSN通过漫游地服务网关Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述Home PGW。
  6. 根据权利要求4所述的方法，所述方法还包括：
    如果UE支持到非3GPP接入的切换，Visited MME或Visited SGSN则向归属用户服务器HSS发送请求消息，将接入点名APN和所述UE真实接入的PGW的FQDN关联关系通知给HSS；所述PGW的FQDN为Home PGW在创建会话响应消息中携带的Home PGW的FQDN。
  7. 根据权利要求6所述的方法，所述方法还包括：
    当所述UE移动到非3GPP时，所述HSS向非3GPP系统提供已激活PDN连接的APN和PGW FQDN信息，所述APN和PGW FQDN是由Visited MME或Visited SGSN通知给HSS的APN和PGW FQDN。
  8. 根据权利要求4、5或6所述的方法，其中，所述数据业务包括以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在长期演进LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
  9. 根据权利要求8所述的方法，所述方法还包括：
    当所述UE回到HPLMN时，所述Visited MME向Home MME发送消息时，携带Home PGW的FQDN；
    所述Home MME根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。
  10. 一种获取PGW FQDN的系统，包括：Visited MME或Visited SGSN，以及Home PGW，其中：
    所述Home PGW，设置为当用户设备UE通过代理PGW从漫游地接入到归属地并进行数据业务时，在收到所述创建会话请求消息后，向Visited MME 或Visited SGSN返回创建会话响应消息；所述创建会话响应消息携带有所述Home PGW的FQDN；
    所述Visited MME或Visited SGSN，设置为保存创建会话响应消息中Home PGW的FQDN。
  11. 根据权利要求10所述的系统，
    所述Visited MME或Visited SGSN，还设置为当UE通过代理PGW从漫游地接入到归属地并进行数据业务时，通过Visited SGW发送创建会话请求消息给代理PGW，由所述代理PGW将所述创建会话请求消息转发给所述UE的Home PGW；
    所述Home PGW，还设置为在收到所述创建会话请求消息后，通过所述Visited SGW向Visited MME或Visited SGSN返回创建会话响应消息。
  12. 根据权利要求11所述的系统，所述系统还包括HSS；
    Visited MME或Visited SGSN，还设置为在UE支持到非3GPP接入的切换时，向HSS发送请求消息，将APN和所述UE真实接入的PGW的FQDN关联关系通知给HSS；所述PGW的FQDN为Home PGW在创建会话响应消息中携带的Home PGW的FQDN。
  13. 根据权利要求12所述的系统，
    所述HSS，设置为当所述UE移动到非3GPP时，向非3GPP系统提供已激活PDN连接的APN和PGW FQDN信息，所述APN和PGW FQDN是由Visited MME或Visited SGSN通知给HSS的APN和PGW FQDN。
  14. 根据权利要求10、11或12所述的系统，其中，所述数据业务包括以下至少之一：UE向Visited MME请求发起PDN连接建立过程；UE在长期演进LTE下开机附着过程；UE在GERAN或UTRAN下首次激活过程；UE回到HPLMN过程。
  15. 根据权利要求14所述的系统，所述系统还包括：Home MME；
    所述Visited MME，还设置为当所述UE回到HPLMN时，向Home MME发送消息时，携带Home PGW的FQDN；
    所述Home MME，设置为根据Home PGW的FQDN，选择和Home PGW拓扑最近的Home SGW。
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