WO2009140919A1 - 一种基于无线分组网关的容灾方法、设备及系统 - Google Patents

一种基于无线分组网关的容灾方法、设备及系统 Download PDF

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Publication number
WO2009140919A1
WO2009140919A1 PCT/CN2009/071876 CN2009071876W WO2009140919A1 WO 2009140919 A1 WO2009140919 A1 WO 2009140919A1 CN 2009071876 W CN2009071876 W CN 2009071876W WO 2009140919 A1 WO2009140919 A1 WO 2009140919A1
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Prior art keywords
wireless packet
packet gateway
standby
information
primary
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PCT/CN2009/071876
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English (en)
French (fr)
Inventor
孙晓姬
张进
袁立平
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华为技术有限公司
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Publication of WO2009140919A1 publication Critical patent/WO2009140919A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/04Arrangements for maintaining operational condition
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/26Network addressing or numbering for mobility support
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16Gateway arrangements

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a disaster tolerance method, device and system based on a wireless packet gateway. Background technique
  • 3GPP 3rd Generation Partnership Project
  • PGW POOL Packet Data Network Gateway Pool
  • Embodiments of the present invention provide a specific implementation method, device, and system for disaster tolerance based on a wireless packet gateway, so as to reduce network risk caused by the current wireless packet gateway being unavailable.
  • An embodiment of the present invention provides a disaster recovery method based on a wireless packet gateway, including: selecting, when the primary wireless packet gateway is unavailable, an alternate wireless packet gateway of the primary wireless packet gateway according to the acquired secondary wireless packet gateway information, The standby wireless packet gateway has a same address pool as the primary wireless packet gateway;
  • the embodiment of the present invention further provides a wireless packet gateway device, configured to access the user equipment to the packet data network, including:
  • a wireless packet gateway selection module configured to: when the primary wireless packet gateway is unavailable, select the backup wireless packet corresponding to the primary wireless packet gateway according to the acquired secondary wireless packet gateway information
  • the gateway, the standby wireless packet gateway and the active wireless packet gateway have the same address pool;
  • the path establishment module is configured to establish a path connection with the standby wireless packet gateway selected by the wireless packet gateway selection module.
  • the embodiment of the present invention further provides a mobility management network element or a service gateway entity, including:
  • a receiving module configured to receive standby wireless packet gateway information sent by the primary wireless packet gateway device
  • a selection module configured to select, according to the alternate wireless packet gateway information, a backup wireless packet gateway corresponding to the primary wireless packet gateway device;
  • a establishing module configured to establish a path connection with the selected standby wireless packet gateway, where the standby wireless packet gateway and the primary wireless packet gateway device have a same address pool.
  • An embodiment of the present invention provides a wireless packet gateway-based disaster recovery system, including: a wireless packet gateway device, configured to select the wireless according to the acquired backup wireless packet gateway information when the wireless packet gateway device is unavailable
  • the standby wireless packet gateway corresponding to the packet gateway device sends the selected backup wireless packet gateway information to the mobility management network element or the serving gateway entity, where the standby wireless packet gateway and the wireless packet gateway device have the same address Pool
  • a mobility management network element or a serving gateway entity is configured to establish a path connection with the selected alternate wireless packet gateway.
  • the embodiment of the present invention further provides a disaster recovery system based on a wireless packet gateway, including: a wireless packet gateway device, configured to send a standby to a mobility management network element or a serving gateway entity when the wireless packet gateway device is unavailable Wireless packet gateway information;
  • a mobility management network element or a service gateway entity configured to select, according to the backup wireless packet gateway information, a backup wireless packet gateway corresponding to the wireless packet gateway device, and establish a path connection with the selected backup wireless packet gateway, where
  • the backup wireless packet gateway has the same address pool as the wireless packet gateway device.
  • FIG. 1 is a schematic diagram of a system for processing a process provided by an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a process for acquiring information of a backup wireless packet gateway according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of another process for acquiring information of a backup wireless packet gateway according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of a process for acquiring information of a standby wireless packet gateway according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a process of switching a PGW according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of another process of switching a PGW according to an embodiment of the present invention
  • FIG. 7 is a third switch according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a processing procedure for deleting a bearer according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a processing procedure of a handover access network according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a wireless packet gateway device according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of a fourth switching PGW according to an embodiment of the present invention
  • FIG. 13 is a schematic structural diagram of a disaster tolerance system based on a wireless packet gateway according to an embodiment of the present invention. detailed description
  • the primary wireless packet gateway when the primary wireless packet gateway is unavailable (such as the primary wireless packet gateway fails, load balancing, overload, maintenance, load migration, or path failure), the primary wireless packet gateway is selected.
  • a backup wireless packet gateway the backup wireless packet gateway having the same address pool as the primary wireless packet gateway; the address pool including more than one address information, such as an IP address, etc., the address information being used for assigning to a network device, such as The user equipment UE communicates.
  • a path connection is then established with the alternate wireless packet gateway.
  • the foregoing embodiment of the present invention further includes the process of acquiring the information of the standby wireless packet gateway of the primary wireless packet gateway, where the process may include: establishing a PDN in the user equipment attachment process or on the user equipment and the network side (Packet Data) Network, packet data network) During the connection process, or during the PDP (Packet Data Protocol) activation process, the information of the backup wireless packet gateway is obtained (the backup wireless packet gateway may be the address of the user address)
  • the backup wireless packet gateway corresponding to the pool may also be all the backup wireless packet gateways of the primary wireless packet gateway, and the standby wireless packet gateway is selected by the primary wireless packet gateway, and specifically may be the primary wireless packet.
  • the gateway is selected in a wireless packet gateway resource pool, where the wireless packet gateway resource pool is composed of a plurality of independent wireless packet gateways, and the wireless packet gateways having the same address pool are mutually active; or
  • the address pool and the alternate address sent by the wireless packet gateway Information about the correspondence between the line packet gateways, and the information of the backup wireless packet gateway is obtained from the information of the corresponding relationship, where the information indicating the correspondence between the address pool and the backup wireless packet gateway may be an address pool and an alternate Correspondence information of the wireless packet gateway, or the correspondence relationship between the APN (Access Point Name) and the backup wireless packet gateway, or the correspondence relationship between the PDN and the backup wireless packet gateway, etc.; or, at the user equipment Acquiring information of the standby wireless packet gateway sent by the source mobility management network element when the service mobility management network element is changed; or acquiring the primary wireless packet gateway by using an alternate relationship between the configured wireless packet gateways Alternate wireless packet gateway, or, through DNS (Domain Name System, the domain name management system) parses the information related to
  • APN (such as address information, alias, etc.), or APN+ primary wireless packet gateway address, or primary wireless packet gateway address, or primary wireless packet gateway alias.
  • the information of the standby wireless packet gateway may specifically be an address, an alias, or the like of the standby wireless packet gateway, which may be used to identify information of the wireless packet gateway.
  • the information of the standby wireless packet gateway of the primary wireless packet gateway may be obtained by a mobility management network element or a service gateway entity currently serving the user.
  • the process of selecting the standby wireless packet gateway of the primary wireless packet gateway may include: selecting, according to the acquired information of the standby wireless packet gateway, an alternate wireless packet of the address pool where the user address is located. Gateway. For example, if the information about the backup wireless packet gateway is obtained according to the information indicating the correspondence between the address pool and the backup wireless packet gateway, the user equipment may be selected according to the correspondence between the address pool and the backup wireless packet gateway.
  • the standby wireless packet gateway corresponding to the address pool of the address of the user equipment; if the information of the standby wireless packet gateway is obtained by other means, selecting the user equipment from the user equipment according to the information of the standby wireless packet gateway The alternate wireless packet gateway corresponding to the address pool where the address is located.
  • the standby wireless packet gateway updates the downlink route of the user by issuing dynamic routing segment information, so that each user can be prevented from issuing a host route. .
  • the primary and secondary wireless packet gateways are prevented from repeatedly assigning an IP address.
  • the primary wireless packet gateway and the standby wireless packet gateway are released.
  • the bearer of the same address pool Upon completion of the operation, the alternate wireless packet gateway transmits its released address pool information to the primary wireless packet gateway, and the primary wireless packet gateway activates the address pool.
  • the process of hosting the address pool specifically includes:
  • the primary wireless packet gateway may be used when the primary wireless packet gateway is restored. Sending an address pool usage query request to the standby wireless packet gateway; the standby wireless packet gateway transmitting idle address information to the primary wireless packet gateway.
  • the wireless packet gateway may be a PGW, a GGSN (Gateway GPRS Support Node, a GPRS, a General Packet Radio Service, a General Packet Radio Service), or a Packet Data Serving Node (PDSN). Data service node), ASN-GW (Access Service Network Gateway), PDG (Packet Data Gateway), and so on.
  • GGSN Gateway GPRS Support Node, a GPRS, a General Packet Radio Service, a General Packet Radio Service), or a Packet Data Serving Node (PDSN).
  • Data service node may be a PGW, a GGSN (Gateway GPRS Support Node, a GPRS, a General Packet Radio Service, a General Packet Radio Service), or a Packet Data Serving Node (PDSN). Data service node), ASN-GW (Access Service Network Gateway), PDG (Packet Data Gateway), and so on.
  • ASN-GW Access Service Network Gateway
  • PGWPOOL PGW resource pool
  • PGW1 and PGW2 share address pool 1 Therefore, the PGW1 and the PGW2 are backup PGWs, and the PGW2 and the PGW3 share the address pool 2, so the PGW2 and the PGW3 are mutually backup PGWs.
  • the primary PGW searches the PGWPOOL (PGW resource pool) for the corresponding standby PGW or the standby PGW list, and notifies the mobility management network element of the information of the standby PGW or the standby PGW list in the default bearer setup response.
  • PGWPOOL PGW resource pool
  • Step 21 The UE sends an attach request message to the mobility management network element, where, for the GERAN/UTRAN (GSM/EDGE radio access network/universal terrestrial radio access network) network, the mobility management network element is an SGSN. (Serving GPRS Support Node, serving GPRS support node), for the EUTRAN (Evolved UMTS Radio Access Network, UMTS Universal Mobile Telecommunications System, Universal Mobile Telecommunications System) network, the mobility management network element is MME (Mobility Management Entity, Mobile management entity), for a non-3GPP network, the mobility management network element refers to a non-3GPP IP access gateway;
  • Step 22 The UE performs an authentication operation with the mobility management network element and the HSS (Home Subscriber Server).
  • HSS Home Subscriber Server
  • Step 23 Perform a location update and insert subscription data flow between the mobility management network element and the HSS.
  • the specific operation mode may be: registering the address of the mobility management network element into the HSS, and the HSS inserts the subscription data of the UE into the mobile terminal.
  • the management network element In the management network element;
  • Step 24 The mobility management network element acquires the subscription data of the UE, and selects the primary PGW according to the default APN that the UE subscribes to.
  • the PGW2 in the system shown in FIG. 1 is selected as the primary PGW.
  • Evolved Packet System bearer Identity the evolved packet system bearer identifier
  • Step 25 The SGW creates a new context for the UE in the EPS bearer table, and sends a default bearer request message to the PGW2 according to the PGW2 address in the Create Default Bearer Request message sent by the mobility management network element.
  • the SGW address and the SGW user plane TEID (Tunnel Endpoint Identifier) are carried in the Create Default Bearer Request message sent by the SGW. Endpoint identification) and SGW control plane TEID and other information;
  • Step 26 The PGW2 returns a Create Default Bearer Response message to the SGW, where the Create Default Bearer Response message sent by the PGW2 carries a PGW2 address, a PGW2 control plane TEID, a PGW2 user plane TEID, an EPS bearer ID, and an alternate PGW information.
  • Information such as the alternate PGW list information, where the standby PGW information or the alternate PGW list information may be an address or an alias of the standby PGW, etc., for identifying the identification information of the standby PGW, and the PGW resource is used by the PGW2 (primary PGW). Obtained in the pool;
  • Step 27 The SGW returns a Create Default Bearer Response message to the mobility management network element, where the SGW sends the default bearer corresponding message carrying the SGW address, the SGW user plane TEID, the SGW control plane TEID, and the standby PGW information. Alternate PGW list information;
  • Step 28 The mobility management network element acquires the information about the standby PGW or the information of the standby PGW list according to the Create Default Bearer Response message sent by the SGW, and sends an attach accept message to the UE.
  • the mobility management network element sends an update location request message to the HSS, where the message carries the APN and PGW2 (primary PGW) address of the default PDN connection used by the UE. Information;
  • the HSS saves the APN and PGW2 address information used by the UE, and returns a location update response message to the mobility management network element.
  • the method may further include the following steps: the PGW2 obtains a default PCC rule by using the PCRF.
  • the information of the standby PGW obtained by the foregoing may be the information of all the standby PGWs corresponding to the primary PGW, or may be the standby PGW information corresponding to the address pool where the UE address is located.
  • the mobility management entity After the operation procedure of the UE attaching, the mobility management entity acquires the standby PGW information or the standby PGW list information corresponding to the PGW2 (the primary PGW), and if the PGW2 fails or is in the subsequent operation, When the link path of PGW2 is unavailable, move The mobility management entity can correctly select the alternate PGW for the UE according to the obtained alternate PGW information.
  • the address pool in which the UE address is located is the address pool 1. If the obtained standby PGW information is only the information of the PGW1 corresponding to the address pool 1, the PGW1 is selected as the standby PGW, and the obtained standby PGW is obtained.
  • the information is PGW1 and PGW3, it is necessary to further determine whether the PGW1 and the PGW3 include the address pool 1. Since the PGW1 includes the address pool 1, the PGW1 is selected as the standby PGW, and the user is switched to the standby PGW to continue. Serving the UE (the IP address of the UE is unchanged), when the PGW2 is restored to normal use, the PGW2 is still adjusted as the PGW currently serving the UE, and the PGW1 is the standby PGW.
  • the application embodiment 1 provides a method for acquiring a standby PGW or a standby PGW in the UE attaching process, and performing a primary and backup PGW switching, thereby realizing device redundancy and PGW POOL-based disaster tolerance, and improving Business stability.
  • the application embodiment of the present invention provides an implementation manner of obtaining the standby PGW information or the standby PGW list information in the PDN connection establishment process.
  • the specific implementation manner is as shown in FIG. 3, and may include the following steps:
  • Step 31 The UE sends a PDN connection request message to the mobility management network element, where the PDN connection request message carries information such as APN and PDN Address Allocation (PDN address allocation).
  • PDN connection request message carries information such as APN and PDN Address Allocation (PDN address allocation).
  • Step 32 The mobility management network element selects the primary PGW according to the APN carried in the PDN connection request message, acquires the address of the primary PGW, and then sends a default bearer request message to the SGW for the default PDN connection.
  • the default bearer request message sent by the mobility management network element carries information such as a primary PGW address and an EPS bearer ID;
  • Step 33 The SGW creates a new context for the UE in the EPS bearer table, and sends a default bearer to the primary PGW according to the primary PGW address in the Create Default Bearer Request message sent by the mobility management network element. a request message, the information about the SGW address, the SGW user plane TEID, and the SGW control plane TEID is carried in the Create Default Bearer Request message sent by the SGW.
  • Step 34 The primary PGW returns a default bearer response message to the SGW.
  • the create default bearer response message sent by the PGW carries information such as a primary PGW address, a primary PGW control plane TEID, a primary PGW user plane TEID, an EPS bearer ID, and an alternate PGW information or an alternate PGW list information.
  • the standby PGW information or the alternate PGW list information may be an address or an alias of the standby PGW, and the identification information for identifying the standby PGW, and is obtained by the primary PGW in the PGW resource pool;
  • Step 35 The SGW returns a create default bearer response message to the mobility management network element, where the SGW sends the default bearer corresponding message carrying the SGW address, the SGW user plane TEID, the SGW control plane TEID, and the standby PGW information. Alternate PGW list information;
  • Step 36 The mobility management network element sends a bearer setup request message to the eNodeB, where the bearer setup request message further includes a PDN connection accept message.
  • Step 37 The RRC (Radio Resource Control) connection reconfiguration is performed between the eNodeB and the UE, and the eNodeB forwards the received PDN connection accept message to the UE in the RRC connection reconfiguration process;
  • RRC Radio Resource Control
  • Step 38 The eNodeB sends a bearer setup response message to the mobility management network element, where the bearer setup response message sent by the eNodeB includes an eNodeB address, a user plane TEID of the eNodeB, and a control plane TEID of the eNodeB.
  • Step 39 The mobility management network element adds the eNodeB address and the user plane TEID of the eNodeB to the SGW to update the information.
  • the mobility management network element sends an update location request message to the HSS, where the message carries the APN and the primary PGW address information of the default PDN connection used by the UE;
  • the APN and the primary PGW address information used by the UE are saved, and the location update response message is returned to the mobility management network element.
  • the primary PGW obtains the default PCC rule by using the PCRF.
  • the information of the standby PGW obtained above may be all the backups corresponding to the primary PGW.
  • the information of the PGW may also be the standby PGW information corresponding to the address pool where the UE address is located.
  • the mobility management entity After the operation process of establishing the PDN connection, the mobility management entity acquires the standby PGW or the standby PGW list of the primary PGW, and in the subsequent operation, if the primary PGW fails or is related to the primary When the link path of the PGW is unavailable, the mobility management entity may select the standby PGW according to the address pool where the UE address is located, and switch to the standby PGW to continue to serve the UE (the IP address of the UE does not change), the standby PGW The standby PGW obtained by the mobility management entity may be, or the mobility management entity may select one standby PGW from the obtained standby PGW list.
  • the standby PGW is selected. If the obtained standby PGW information is the information of all the standby PGWs corresponding to the primary PGW, further information is needed. Determining whether the alternate PGW includes the address pool, and selecting a standby PGW that includes the address pool.
  • the create default bearer response message sent by the SGW to the MME may not include the standby PGW or the backup PGW list information, that is, the SGW obtains the information of the standby PGW information or the standby PGW list.
  • the SGW selects the standby PGW according to the address pool where the UE address is located, and switches to the standby PGW to continue to serve the UE (the IP address of the UE remains unchanged). ), and adjust the standby PGW to the primary PGW.
  • the application embodiment 2 provides a specific implementation manner for acquiring the standby PGW information in the process of establishing the PDN connection based on the PGWPOOL.
  • the mobility management network element or the SGW obtains the standby PGW information or the standby PGW list in the process. Information, so that when the primary PGW fails, it can be switched to the standby PGW to achieve disaster tolerance, which improves the stability of the system.
  • the application embodiment describes a method for obtaining a standby GGSN or a standby GGSN list in an MS (Mobile Station) PDP activation process, and the specific implementation manner is as shown in FIG. 4 . It can include the following steps:
  • Step 41 The MS initiates an activation PDP request message to the SGSN, where the activation PDP request message includes information such as a PDP type, a PDP address, an APN, and a Qos (Quality of Service).
  • the activation PDP request message includes information such as a PDP type, a PDP address, an APN, and a Qos (Quality of Service).
  • Step 42 The SGSN sends a PDP context request message to the primary GGSN, where the PDP context request message includes information such as a PDP type, a PDP address, and an APN.
  • Step 43 The primary GGSN returns a Create PDP Context Response message to the SGSN, where the PDP context corresponding message includes a PDP address, a TEID of the primary GGSN user plane, a TEID of the primary GGSN control plane, a negotiated Qos, and a standby GGSN information.
  • the standby GGSN list information where the primary GGSN obtains the standby GGSN or the standby GGSN list in the GGSN POOL, the primary GGSN and the standby GGSN share a same address pool, and the SGSN receives the message learned according to the primary GGSN.
  • the standby GGSN information of the primary GGSN is used.
  • Step 44 The UE performs radio bearer setup with the RAN (Radio Access Network), and the Iu bearer is established between the RAN side and the SGSN, thereby completing the RAB bearer construction step 45, SGSN.
  • step 44 If the Qos is changed in the above step 44, the following steps are also included between step 44 and step 45:
  • the SGSN needs to send an Update PDP Context Request message to the GGSN to update the Qos; the GGSN sends an Update PDP Context Response message to the SGSN to confirm the new Qos parameter.
  • the information of the standby GGSN that is obtained may be the information of all the standby GGSNs corresponding to the primary GGSN, or may be the standby GGSN information corresponding to the address pool where the MS address is located. If the obtained standby GGSN information is only the information of the standby GGSN corresponding to the address pool in which the MS address is located, the standby GGSN is selected when the primary and backup GGSNs are switched, and the obtained standby GGSN information is used by all the standby GGSNs corresponding to the primary GGSN. Information, then switch between primary and backup GGSN It is necessary to further determine whether the standby GGSN includes the address pool, and select a standby GGSN that includes the address pool.
  • the SGSN After the PDP activation process is performed, when the SGSN detects that the primary GGSN is faulty or the path connected to the primary GGSN is unavailable, the SGSN can immediately switch the service of the MS to the standby GGSN to implement disaster recovery protection.
  • the selected GGSN and the active GGSN share an address pool (the address pool is the address pool of the MS address), so that the IP address of the MS does not change, and the GGSN disaster recovery technical solution in the prior art is adopted.
  • the GGSN switching process does not need to be re-activated, which can reduce route flapping and shorten the delay caused by service interruption.
  • the active and standby PGW lists are configured in advance on the mobility management network element or the SGW, or the active and standby GGSN lists are configured in advance on the SGSN.
  • the active/standby PGW (or the active and standby GGSN) lists are used to describe the correspondence between the PGWs (or GGSNs).
  • the PGWs (or GGSNs) sharing the same address pool are mutually active and standby.
  • the primary GGSN and the standby PGW (or the standby GGSN) share an address pool. If the primary PGW is divided into multiple address segments, different address segments may correspond to different spare PGWs. In addition, the same address segment may also be used. Corresponds to multiple spare PGWs.
  • the mobility management network element or the SGW may select the address pool corresponding to the address of the user address according to the configured active/standby PGW (or primary and secondary GGSN) list.
  • the standby PGW (or the standby GGSN) and the switching path continue to provide services for the user, while the standby PGW (or GGSN) advertises the downlink route that the host routes to the bearer network update user.
  • the active/standby PGW list is configured on the SGW, the SGW needs to notify the mobility management network element of the updated PGW address or alias after the handover path ends.
  • An application implementation example of the present invention provides a specific implementation manner of switching a PGW.
  • the PGW needs to be maintained or is about to fail, the related mobility management network element is notified to perform the redirection operation of the PGW.
  • the PGW associates the correspondence between the address pool and the standby PGW (or the correspondence between the APN and the standby PGW).
  • the relationship, or the correspondence between the PDN connection number and the alternate PGW, and the like, may indicate that the correspondence relationship between the address pool and the backup PGW is notified to the mobility management network element, and the mobility management network element selects the UE according to the corresponding relationship information.
  • the standby PGW corresponding to the address pool is located, and the PGW redirection operation is completed.
  • the activated UEs on the faulty PGW are migrated to the standby PGW to implement disaster recovery and load sharing.
  • FIG. 5 The specific implementation of the above process is shown in FIG. 5, and may include the following steps:
  • Step 51 The primary PGW sends a redirection command to the associated SGW, where the Redirect Command includes a relationship table between the APN and the standby PGW (other relationship tables indicating an address pool and an alternate PGW);
  • Step 52 After receiving the redirect command of the PGW, the SGW forwards the command to the associated MME.
  • Step 53 The mobility management network element selects a new SGW for the UE, sends a create default bearer request message to the new SGW, requests to establish a default bearer, and according to the relationship table included in the redirect command sent by the original SGW,
  • the standby PGW corresponding to the address pool in which the UE address is located is selected, and the default bearer request message sent by the mobility management network element carries the standby PGW address, IMSI (International Mobile Subscriber Identity), and MSISDN ( The mobile station ISDN number, the EPS bearer ID, and the PDN address, etc., wherein the creating a default bearer request message carries the PDN address to ensure that the PDN address is consistent with the original PDN address of the UE;
  • IMSI International Mobile Subscriber Identity
  • MSISDN The mobile station ISDN number, the EPS bearer ID, and the PDN address, etc.
  • Step 54 The new SGW creates and the standby PGW according to the standby PGW address. Bearer between
  • Step 55 The new SGW sends a Create Default Bearer Response message to the mobility management network element, where the Create Default Bearer Response message sent by the new SGW carries the tunnel identifier, the new SGW address, and the a TEID of the new SGW user plane, a TEID and an EPS bearer ID of the new SGW control plane;
  • Step 56 The MME deletes the resource of the UE on the original SGW, and the MME deletes the resource of the UE on the primary PGW.
  • the following operations may also be performed: updating the PGW and APN information of the UE in the HSS.
  • the process of the above step 53 to update the PGW and APN information of the UE in the HSS may be repeatedly performed until the users in the same address pool complete the PGW handover work.
  • the standby PGW advertises the host route segment to the service gateway. This prevents each UE from issuing a host route.
  • step 53 of the foregoing process if the PDN address is not included in the Create Bearer Request message sent by the mobility management network element, the primary PGW is used as the DHCP to ensure that the PDN address is consistent with the original PDN address of the UE.
  • the client requests the DHCP server to obtain the PDN address through the user ID.
  • the application implementation example of the present invention provides a specific implementation process for implementing disaster tolerance by switching the PGW. According to the above description, since the address pool of the UE address is unchanged during the process of switching the PGW, the UE replaces the PGW. There is no need to replace the IP address, that is, the process of re-activation is not required, thus reducing the network risk and reducing the delay caused by the service interruption.
  • the following uses the PGW as an example to illustrate an implementation of switching a wireless packet gateway.
  • the sixth embodiment of the present invention provides another specific implementation manner of switching the PGW. Notify all associated mobility management network elements when the PGW needs maintenance or an impending failure
  • the mapping operation of the PGW may be: the mapping relationship between the address pool and the standby PGW (or the correspondence between the APN and the standby PGW, or the correspondence between the PDN connection number and the standby PGW, etc.) may represent an address pool.
  • Corresponding relationship information with the standby PGW is notified to the mobility management network element, and the mobility management network element selects the standby PGW corresponding to the address pool of the address of the UE according to the corresponding relationship information, and completes the redirection operation of the PGW, that is, the fault PGW
  • the activated users are migrated to the standby PGW to implement disaster recovery and load sharing.
  • the specific implementation manner of the foregoing processing process is as shown in FIG. 6 , and specifically includes the following steps:
  • Step 61 The primary PGW sends a redirection command to the associated SGW, and the Redirect Command carries a relationship table between the APN and the standby PGW (other relationship tables indicating an address pool and an alternate PGW);
  • Step 62 After receiving the redirect command of the PGW, the SGW forwards the command to the associated mobility management network element.
  • Step 63 The mobility management network element sends a bearer update request message to the SGW, and selects the standby PGW according to the redirection command sent by the SGW.
  • the method for selecting the alternate PGW is the same as the method in step 53 of the fifth embodiment.
  • the bearer update request message carries the user identifier and the alternate PGW address, the APN and the EPS bearer ID;
  • Step 64 The SGW performs bearer creation and update with the standby PGW according to the bearer update request message sent by the mobility management network element in step 63.
  • Step 65 The SGW sends a bearer update response to the mobility management network element, to notify the mobility management network element that the path switch is completed.
  • the operation of updating the PGW and APN information of the user in the HSS may be repeated multiple times until the users in the same address pool complete the handover of the PGW.
  • the standby PGW advertises a host routing segment or a host route to the service gateway.
  • the application of the sixth embodiment of the present invention provides another implementation process for implementing disaster tolerance by switching the PGW. Compared with the implementation solution provided by the fifth embodiment, the technical solution provided by the sixth embodiment of the present invention does not need to select a new one for the user.
  • the SGW can complete the PGW switching process.
  • the following uses the PGW as an example to illustrate an implementation of switching a wireless packet gateway.
  • the seventh embodiment of the present invention provides a specific implementation manner of the third switching PGW.
  • the primary PGW notifies the SGW to perform a redirection operation when the primary PGW needs to be maintained or fails. After the SGW handover path ends, the standby PGW address is notified to the MME.
  • the specific implementation may include the following steps:
  • Step 71 The primary PGW sends a redirection command to the associated SGW, where the redirection command includes a relationship table between the APN and the standby PGW (other relationship tables indicating an address segment and an alternate PGW);
  • Step 72 The SGW selects, according to the corresponding relationship table, a standby PGW corresponding to the address pool where the UE address is located, and establishes a bearer with the standby PGW.
  • Step 73 The SGW sends an update context message to the MME to complete the context update, where the update context message includes information such as the standby PGW address, the APN, the EPS Bearer ID, and the user identifier.
  • the above step 72 to update the PGW and APN information of the user in the HSS can be repeatedly performed until the users in the same address pool complete the PGW handover.
  • the standby PGW advertises the host route segment or the host route to the service gateway. This prevents each user from advertising a host route.
  • the application implementation example of the present invention provides a specific implementation process for implementing disaster tolerance by switching the PGW.
  • the UE is replacing the PGW because the backup PGW ensures that the backup PGW has the address pool where the UE address is located. No need to change the IP address, that is, no need to carry out
  • the process of reactivation reduces network risk and reduces latency due to business disruptions.
  • the backup wireless packet gateway When the primary wireless packet gateway is available for recovery, the backup wireless packet gateway also needs to return the IP address to ensure that the primary and backup wireless packet gateways do not repeatedly assign IP addresses.
  • the application embodiment of the present invention takes PGW as an example, and an implementation method is provided. The specific implementation manner can be divided into two processes of deleting a PDN bearer and returning an IP address. The process of deleting a PDN bearer is as shown in FIG. 8 . It can include the following steps:
  • Step 81 The UE sends a PDN release request message, where the PDN release request message carries an LBI (Linked EPS Bearer ID), where the LBI is a default bearer parameter associated with the PDN.
  • LBI Linked EPS Bearer ID
  • Step 82 The MME sends a delete bearer request message to the SGW, where the delete bearer request message carries the TEID of the MME user plane, the TEID and the LBI of the MME control plane;
  • Step 83 The SGW sends a delete bearer request message to the active PGW according to the TEID identifier and the LBI parameter, where the delete bearer request message includes the TEID of the SGW user plane, and the SGW control faces the TEID and the LBI;
  • Step 84 The primary PGW interacts with the PCRF, and the primary PGW notifies the EPS bearer of the PCRF response to be deleted;
  • Step 85 The primary PGW replies to delete the bearer response message to the SGW.
  • Step 86 The SGW interacts with the standby PGW (that is, the primary PGW before the handover) and the PCRF, and deletes the bearer of the corresponding PDN connection on the standby PGW. Specifically, the SGW sends a delete bearer request message to the standby PGW, where the delete bearer request message is sent.
  • the TEID including the SGW user plane, the SGW controls the TEID and the LBI; the standby PGW and the PCRF interact to notify the PCRF that the corresponding EPS bearer is deleted; the standby PGW replies with the delete bearer response message to the SGW; the standby PGW issues the host route, Update the downlink route;
  • Step 87 The SGW replies to delete the bearer response message to the MME.
  • Step 88 The MME initiates a delete bearer resource message to the eNodeB, and deletes the eNodeB. And the PDN-related radio bearer resource, where the de-carrying resource message further carries a PDN disconnection response, and the eNodeB forwards the delete bearer resource message to the UE, and carries the PDN disconnection response to the UE.
  • the PGW and APN information of the user in the HSS needs to be updated.
  • step 86 there is no sequence sequence between steps 83-85 and step 86, that is, the bearer process of deleting the bearer of the active PGW and deleting the standby PGW has no sequence in sequence.
  • the delete bearer request message may further carry the primary PGW address and the standby PGW address, and the primary and secondary PGW addresses are used to notify the SGW that the bearer corresponding to the corresponding PDN connection on the active and standby PGWs needs to be deleted.
  • the MME sends a delete bearer request message to the two SGWs.
  • the address or address pool that was previously activated on the standby PGW is deactivated.
  • the IP address is returned to the active PGW.
  • the specific implementation process is as follows: The alternate PGW sends an address (or address pool) to release the notification to the primary PGW, which carries the released address (or address pool).
  • the address (or address pool) is available on the primary PGW and is not available on the alternate PGW.
  • the embodiment of the present invention provides a specific implementation scheme for returning an IP address and ensuring that the IP address is not repeatedly allocated. For the user of dynamic address allocation, after switching the wireless packet gateway, there is no need to change the IP address, thereby reducing The network risks avoid delays caused by business interruptions.
  • the handover process is as shown in FIG. 9 , and specifically includes the following steps:
  • Step 91 The UE reports the measurement report to the source access network, and the source access network determines to initiate the handover process according to the measurement report of the UE, that is, sends the handover request message to the source MME (or the source SGSN);
  • the context information of the UE including the primary PGW address, the primary PGW user plane TEID, the primary PGW control plane TEID, the SGW address, the SGW user plane TEID, and the SGW control plane TEID, and the alternate PGW information (address or alias) , so that disaster recovery can be achieved after the failure of the primary PGW.
  • Step 93 The target MME (or the target SGSN) allocates a context to the user, and sends a handover request message to the target access network, where the handover request message sent by the target MME (or the target SGSN) carries the user plane TEID and uplink of the uplink data. Control plane TEID and uplink data address of the data;
  • Step 94 The target access network sends a handover request response message to the target MME (or the target SGSN);
  • Step 95 The target MME (or SGSN) sends a forward handover request response message to the source MME (or SGSN);
  • Step 96 The source MME (or SGSN) sends a handover command to the source access network.
  • Step 97 The source access network sends the handover command to the UE, indicating that the UE accesses the target access network.
  • Step 98 The UE switches to the target access network, and updates the corresponding bearer context to continue the original service.
  • Step 99 The tracking area changes, the UE initiates a tracking area update process, and allocates a new GUTI (Globally Unique Temporary Identity) to the UE.
  • GUTI Globally Unique Temporary Identity
  • the target MME or the SGSN acquires the primary wireless packet gateway information and the corresponding standby wireless packet gateway information.
  • the wireless packet gateway can still be switched. Thereby achieving disaster tolerance.
  • the application example 10 of the present invention gives a user when entering a new tracking area or routing area.
  • the specific implementation manner of the active/standby wireless packet gateway may include the following steps:
  • Step 101 The UE sends a tracking area update (or routing area update) request message to the access network where the UE is located, where the tracking area update (or routing area update) request message carries the global temporary identifier of the user;
  • Step 102 The access network selects a new MME (or a new SGSN) for the UE, and forwards a TAU (or RAU) request message sent by the UE to the new MME (or a new SGSN), and the target.
  • MME or target SGSN
  • Step 103 The target MME (or target SGSN) derives the source MME (or source SGSN) according to the global temporary identifier of the UE, and sends a context request message to the source MME (or source SGSN) to obtain context information of the UE.
  • Step 104 The source MME (or the source SGSN) sends a context response message to the target MME (or the target SGSN), where the context response message includes context information of the UE, where the UE context information includes: a bearer context, a mobility management context, and an SGW.
  • Step 105 The target MME (or the target SGSN) performs an authentication process.
  • Step 106 The target MME (or the target SGSN) sends a context response message to the source MME (or source SGSN);
  • Step 107 The target MME (or the target SGSN) updates the UE context information in the SGW.
  • Step 109 The target MME (or target SGSN) sends a TAU (or RAU) accept message to the UE;
  • Step 1010 The UE sends a TAU (or RAU) completion message to the target MME (or the target SGSN).
  • TAU or RAU
  • the target MME or SGSN obtains the primary wireless packet gateway information and the corresponding standby wireless packet gateway information.
  • the wireless packet gateway fails, it can still achieve disaster recovery by switching the wireless packet gateway.
  • the information about the standby wireless packet gateway (such as the address information) can also be obtained by using a DNS query method.
  • the specific query method may be to parse the APN to obtain the information of the standby wireless packet gateway, or parse the information. Acquiring the information of the standby wireless packet gateway by using the APN+ primary wireless packet gateway address, or parsing the primary wireless packet gateway address to obtain the information of the standby wireless packet gateway, or parsing the alias of the primary wireless packet gateway to obtain the standby wireless packet Gateway information.
  • the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes the steps of the foregoing method embodiments;
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
  • the embodiment of the present invention further provides a packet data network gateway device for accessing a user equipment to a packet data network, where the structure is as shown in FIG. 11.
  • the specific implementation structure may include:
  • the wireless packet gateway selection module 111 is configured to select the primary wireless packet gateway when the primary wireless packet gateway is unavailable (such as the primary wireless packet gateway fails, load balancing, overload, maintenance, or path failure) Corresponding backup wireless packet gateway, the backup wireless packet gateway and the primary wireless packet gateway have the same address pool;
  • the path establishment module 112 is configured to establish a path connection with the backup wireless packet gateway selected by the wireless packet gateway selection module 111.
  • the specific path establishment module 112 includes acquiring a bearer context container of the primary wireless packet gateway, and sending the bearer. Context container to alternate wireless packet network
  • the closed module so that the standby wireless packet gateway creates a context according to the bearer context container
  • the path establishment module 112 may further include a module for obtaining a redirect complete identifier, so that the standby wireless packet gateway updates the host route according to the redirect complete identifier.
  • the above packet data network gateway device can be replaced by other wireless packet gateway devices.
  • the device in the embodiment of the present invention may further include a wireless packet gateway acquiring module 113.
  • the wireless packet gateway acquiring module 113 may include: a first acquiring module 1131, configured to be in a user equipment attaching process, or in a user equipment and a network. Acquiring information of one or more of the standby wireless packet gateways during the PDN connection process of the packet data network, or during the packet data protocol PDP activation process by the user equipment, the backup wireless packet gateway being used by the primary wireless packet gateway according to the user
  • the second acquisition module 1132 is configured to acquire information indicating a correspondence between the address pool and the backup wireless packet gateway sent by the primary wireless packet gateway, and obtain the backup from the information of the correspondence relationship.
  • the wireless packet gateway selection module is specifically configured to: when the primary wireless packet gateway is unavailable, select an alternate wireless packet gateway of the address pool where the user address is located according to the obtained information of the standby wireless packet gateway. For example, if the information about the backup wireless packet gateway is obtained according to the information indicating the correspondence between the address pool and the backup wireless packet gateway, the user equipment may be selected according to the correspondence between the address pool and the backup wireless packet gateway. The user An alternate wireless packet gateway corresponding to the address pool of the device; if the information of the standby wireless packet gateway is obtained by other means, the address of the user equipment is selected for the user equipment according to the information of the standby wireless packet gateway. The alternate wireless packet gateway corresponding to the address pool.
  • the device provided by the embodiment of the present invention further includes a release module, and the module may be specifically configured to release the primary wireless packet gateway and the primary wireless packet gateway after the primary wireless packet network is restored and available.
  • the bearer of the same address pool of the standby wireless packet gateway may be specifically configured to release the primary wireless packet gateway and the primary wireless packet gateway after the primary wireless packet network is restored and available.
  • the operation of releasing the bearer of the same address pool of the primary wireless packet gateway and the standby wireless packet gateway may specifically be: (1) acquiring an address of the primary wireless packet gateway and the standby wireless Addressing the address of the packet gateway; releasing the primary wireless packet gateway PDN bearer according to the address of the primary wireless packet gateway; releasing the PDN bearer of the standby wireless packet gateway according to the address of the standby wireless packet gateway, the PDN bearer a PDN bearer for the same address pool of the primary and backup wireless packet gateways; or (2) releasing the same address pool of the backup wireless packet gateway as the primary wireless packet gateway; or (iii) deactivating the spare Wireless packet gateway.
  • the device provided by the embodiment of the present invention can reduce the network risk to the user by switching the service to the corresponding standby wireless packet gateway in time when the primary wireless packet gateway is unavailable according to the acquired information of the standby wireless packet gateway. provide better service. Moreover, since the address pool resources of the standby wireless packet gateway can be released in time, the primary and backup wireless packet gateways are effectively prevented from repeatedly assigning IP addresses.
  • the thirteenth embodiment of the present invention provides a process for the user equipment on the primary P-GW to migrate to the standby P-GW.
  • the primary wireless packet gateway is unavailable, the primary wireless packet gateway is faulty and load balanced. If the overload, maintenance, load migration, or path failure occurs, the user equipment on the primary P-GW needs to be migrated to the standby P-GW.
  • the primary P-GW sends a redirect request to the S-GW. Send a redirect request to the MME.
  • the MME initiates the establishment of a backup bearer between the S-GW and the standby P-GW, and does not forward data at this time.
  • the end identifier is carried in the redirect request message, and all related MMEs and S-GWs are notified to complete the redirection.
  • the MME upgrades the backup bearer as the primary bearer, deletes the original primary bearer information, and updates the information of the P-GW on the HSS to the backup P-GW on a per-user basis.
  • the S-GW initiates activating a bearer that connects all backups of the standby P-GW, and deletes the bearer connected to the primary P-GW.
  • the P-GW issues a host routing update to the external PDN and starts forwarding data and updating the P-GW information on the PCRF. Referring to Figure 12, the details are as follows:
  • Step 121 The primary P-GW sends a redirect request message to the S-GW, where the redirect request message includes an alternate P-GW address and a bearer context container, and the redirect request message may further include a user identifier and/or Directional identification, the bearer context container is mainly for the standby P-GW to reuse the bearer context information of the primary P-GW, the container includes Qos, PCC rules, charging information, DHCP information, etc., so that the standby P-GW utilizes the primary PGW Information to create backup bearers, save network resources and reduce bearer switching time; redirects to identify the primary P-GW
  • the UE is redirected to the backup P-GW;
  • the user identifier may be an IMSI;
  • the redirect request message in this embodiment includes an alternate P-GW address, a bearer context container, and a user identifier as an example;
  • Step 122 S-GW Obtaining the migration of the P-GW according to the redirection request message, and saving the alternate P-GW address information, and the S-GW sends the redirection request message to the MME where the UE is located;
  • Step 123 The MME saves the user-related context information and the backup P-GW address information according to the redirect request message, creates a backup bearer context, and sends a create backup bearer request message to the S-GW, where the create backup bearer request message is included.
  • Step 124 The S-GW creates a backup bearer context, allocates a new TEID for the backup bearer, and sends a backup bearer request message to the standby P-GW.
  • Step 125 The backup P-GW creates a backup bearer context, and allocates a TEID to the backup bearer, and sends a backup bearer response message to the S-GW, where the backup bearer response message includes the control plane address and the user plane address of the standby P-GW.
  • Step 126 The S-GW sends a backup backup bearer response message to the MME, where the MME maintains the bearer context information related to the backup P-GW, where the backup bearer response message includes the user identifier, the alternate P-GW address information, and the TEID, which are specifically: User ID, control plane address and control plane TEID of the standby P-GW, user plane address of the standby P-GW, and user plane TEID;
  • Step 127 The MME sends a redirection completion message to the S-GW to notify the S-GW that the redirection is complete, where the redirection completion message includes a user identifier, to notify the S-GW which UEs have completed the redirection;
  • Step 128 The S-GW sends a redirection completion message to the P-GW to notify the P-GW that the redirection is completed.
  • Step 129 The P-GW repeatedly performs step 121—steps for the remaining UEs in the same address segment.
  • Step 1210 The P-GW sends a redirect request message to all related S-GWs, and the P-GW deletes information of all UEs in the address segment, where the redirect request message includes a redirect completion identifier, indicating that the primary P- The last UE on the GW will complete the redirect to the standby P-GW;
  • Step 1211 The S-GW forwards the redirection request message to all related MMEs, where the redirection request message includes an active P-GW address, an alternate P-GW address, and a redirection completion identifier.
  • Step 1212 The MME obtains the redirection completion. After the identification, the backup P-GW related backup bearer context is switched to the primary bearer context, and the original primary P-GW related bearer context is deleted.
  • Step 1213 The S-GW sends an active backup bearer request message to the standby P-GW, where The active backup bearer request message includes the primary P-GW address;
  • Step 1214 After receiving the message, the standby P-GW issues a host routing update in the PDN, that is, updates the host routing network segment information.
  • Step 1215 The P-GW returns an active backup bearer response message to the S-GW, where the S-GW and the standby P-GW start to transmit user plane data on the bearer.
  • Step 1216 The MME sends a redirect complete message to the S-GW.
  • Step 1217 The S-GW sends a redirection completion message to the P-GW.
  • Step 1218 The MME starts to update the P-GW information of the bearer of each user on the HSS.
  • the PCRF sends the latest PCC rule to the standby PGW to complete the bearer establishment or modification.
  • the MME may decide to migrate the users according to the preset policy, where the preset policy may include parameters such as user status, user priority, and service priority.
  • An embodiment of the present invention provides a mobility management network element or a service gateway entity, including: a receiving module, configured to receive standby wireless packet gateway information sent by an active wireless packet gateway device; and a selecting module, configured to use, according to the standby wireless The packet gateway information is used to select a backup wireless packet gateway corresponding to the primary wireless packet gateway device; and an establishing module, configured to establish a path connection with the selected backup wireless packet gateway, where the standby wireless packet gateway and the primary use A wireless packet gateway device has a same pool of addresses.
  • An embodiment of the present invention provides a disaster recovery system based on a wireless packet gateway, including: a packet data network gateway device, configured to: when the packet data network gateway device is unavailable, select the packet according to the acquired backup wireless packet gateway information. a backup wireless packet gateway corresponding to the data network gateway device, and sending the selected backup wireless packet gateway information to a mobility management network element or a serving gateway entity, where the standby wireless packet gateway and the packet data network gateway device have A same address pool; a mobility management network element or a serving gateway entity, configured to establish a path connection with the selected alternate wireless packet gateway.
  • the above packet data network gateway device can be replaced by other wireless packet gateway devices.
  • An embodiment of the present invention provides a disaster recovery system based on a wireless packet gateway, including: a packet data network gateway device, configured to: when the packet data network gateway device is unavailable, to a mobility tube And the serving network element or the serving gateway entity sends the standby wireless packet gateway information; the mobility management network element or the serving gateway entity is configured to select the standby wireless packet gateway corresponding to the packet data network gateway device according to the standby wireless packet gateway information, and The selected backup wireless packet gateway establishes a path connection, wherein the backup wireless packet gateway and the packet data network gateway device have a same address pool.
  • the above packet data network gateway device can be replaced by other wireless packet gateway devices.
  • the embodiment of the present invention further provides a disaster recovery system based on a wireless packet gateway, and the structure thereof is as shown in FIG.
  • a wireless packet gateway selecting means 131 configured to select the primary wireless packet gateway when the primary wireless packet gateway is unavailable (such as the primary wireless packet gateway fails, load balancing, overload, maintenance required, or path failure) a backup wireless packet gateway, the backup wireless packet gateway having the same address pool as the primary wireless packet gateway;
  • the path establishing means 132 is configured to establish a path connection with the alternate wireless packet gateway selected by the wireless packet gateway selecting means 131.
  • the wireless packet gateway selecting device 131 is specifically configured to: when the primary wireless packet gateway is unavailable, select an alternate wireless packet in the address pool where the user address is located according to the obtained information of the standby wireless packet gateway. Gateway.
  • the standby wireless packet gateway updates the downlink route of the user by issuing dynamic routing segment information, so that each user can be prevented from issuing a host route. .
  • the system provided by the embodiment of the present invention may further include a releasing device 133, and the releasing device 133 may be specifically configured to release the primary wireless packet gateway after the primary wireless packet gateway is restored.
  • the operation of releasing the bearer of the same address pool of the primary wireless packet gateway and the standby wireless packet gateway is specifically: Determining an address of the primary wireless packet gateway and an address of the standby wireless packet gateway; releasing the primary wireless packet gateway PDN bearer according to an address of the primary wireless packet gateway; releasing the location according to the address of the standby wireless packet gateway Determining a PDN bearer of the standby wireless packet gateway, the PDN bearer is a PDN bearer of the same address pool of the primary and backup wireless packet gateways; or (2) releasing the standby wireless packet gateway is the same as the primary wireless packet gateway Address pool; or (c) deactivate the alternate wireless packet gateway.
  • the standby wireless packet gateway sends its released address pool information to the primary wireless packet gateway, and the primary wireless packet gateway activates the address pool.
  • the primary wireless packet gateway when the unavailable primary wireless packet gateway is available for recovery, the primary wireless packet gateway sends an address pool usage query request to the standby wireless packet gateway; The backup wireless packet gateway sends idle address information to the primary wireless packet gateway.
  • the network risk can be reduced because the information of the standby wireless packet gateway can be used to switch the service to the corresponding standby wireless packet gateway when the primary wireless packet gateway is unavailable. Users provide better service. Moreover, since the address pool resources of the standby wireless packet gateway can be released in time, the primary and backup wireless packet gateways are effectively prevented from repeatedly assigning IP addresses.

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Description

一种基于无线分组网关的容灾方法、 设备及系统 技术领域
本发明涉及移动通信技术领域,尤其涉及一种基于无线分组网关的容灾 方法、 设备及系统。 背景技术
为了增强未来网络的竞争能力, 3GPP ( third Generation Partnership Project, 第三代合作项目) 正在研究一种全新的演进网络。 为了减少自然灾 害造成业务中断, 向用户提供高质量、 稳定的服务, 所述全新的演进网络提 出了 PGW POOL (Packet Data Network Gateway Pool, 分组数据网络网关资 源池) 的概念。
发明人在实现本发明的过程中, 发现现有技术中至少存在如下问题: 3GPP协议中并未给出 PGW POOL的具体实现方式,进而也没有给出基 于 PGW POOL实现容灾的具体实现方式。 发明内容
本发明的实施例提供了一种基于无线分组网关的容灾的具体实现方法、 设备及系统, 以降低由于当前无线分组网关不可用造成的网络风险。
本发明的实施例提供了一种基于无线分组网关的容灾方法, 包括: 当主用无线分组网关不可用时,根据获取的备用无线分组网关信息选择 所述主用无线分组网关的备用无线分组网关,所述备用无线分组网关与主用 无线分组网关拥有一段相同的地址池;
与所述备用无线分组网关建立路径连接。
本发明的实施例又提供了一种无线分组网关设备,用于将用户设备接入 到分组数据网络, 包括:
无线分组网关选择模块, 用于当主用无线分组网关不可用时, 根据获取 的备用无线分组网关信息选择所述主用无线分组网关对应的备用无线分组 网关, 所述备用无线分组网关与主用无线分组网关拥有一段相同的地址池; 路径建立模块,用于与所述无线分组网关选择模块选择的备用无线分组 网关建立路径连接。
本发明的实施例再提供了一种移动性管理网元或者服务网关实体, 包 括:
接收模块,用于接收主用无线分组网关设备发送的备用无线分组网关信 息;
选择模块,用于根据所述备用无线分组网关信息选择所述主用无线分组 网关设备对应的备用无线分组网关;
建立模块, 用于与所述选择的备用无线分组网关建立路径连接, 其中, 所述备用无线分组网关与主用无线分组网关设备拥有一段相同的地址池。
本发明的实施例提供了再一种基于无线分组网关的容灾系统, 包括: 无线分组网关设备, 用于当所述无线分组网关设备不可用时, 根据获取 的备用无线分组网关信息选择所述无线分组网关设备对应的备用无线分组 网关,将所述选择的备用无线分组网关信息发送给移动性管理网元或者服务 网关实体, 其中, 所述备用无线分组网关与无线分组网关设备拥有一段相同 的地址池;
移动性管理网元或者服务网关实体,用于与所述选择的备用无线分组网 关建立路径连接。
本发明的实施例再提供了一种基于无线分组网关的容灾系统, 包括: 无线分组网关设备, 用于当所述无线分组网关设备不可用时, 向移动性 管理网元或者服务网关实体发送备用无线分组网关信息;
移动性管理网元或者服务网关实体,用于根据所述备用无线分组网关信 息选择所述无线分组网关设备对应的备用无线分组网关,与所述选择的备用 无线分组网关建立路径连接, 其中, 所述备用无线分组网关与无线分组网关 设备拥有一段相同的地址池。 由上述本发明的实施例提供的技术方案可以看出,本发明实施例中提供 了一种基于无线分组网关的容灾的具体实现方式, 从而可以降低网络风险, 提高服务质量。 附图说明
此处所说明的附图用来提供对本发明的进一步理解,构成本申请的一部 分, 并不构成对本发明的限定。 在附图中:
图 1为应用本发明实施例提供的一种处理过程的系统示意图; 图 2为本发明实施例提供的一种获取备用无线分组网关信息的处理过程 示意图;
图 3为本发明实施例提供的另一种获取备用无线分组网关信息的处理过 程示意图;
图 4为本发明实施例提供的第三种获取备用无线分组网关信息的处理过 程示意图;
图 5为本发明实施例提供的一种切换 PGW的处理过程示意图; 图 6为本发明实施例提供的另一种切换 PGW的处理过程示意图; 图 7为本发明实施例提供的第三种切换 PGW的处理过程示意图; 图 8为本发明实施例提供的一种删除承载的处理过程示意图; 图 9为本发明实施例提供的一种切换接入网的处理过程示意图; 图 10为本发明实施例提供的一种跟踪区 /路由区更新的过程示意图; 图 11为本发明实施例提供的一种无线分组网关设备的结构示意图; 图 12为本发明实施例提供的第四种切换 PGW的处理过程示意图; 图 13为本发明实施例提供的一种基于无线分组网关的容灾系统的结构 示意图。 具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚明白, 下面结合实 施例和附图, 对本发明实施例做进一步详细说明。 在此, 本发明的示意性实 施例及其说明用于解释本发明, 但并不作为对本发明的限定。
本发明实施例中, 当主用无线分组网关不可用 (如所述主用无线分组网 关发生故障、负荷均衡、过载、 需要维护、负载迁移或者出现路径故障)时, 选择所述主用无线分组网关的备用无线分组网关,所述备用无线分组网关与 主用无线分组网关拥有一段相同的地址池;所述地址池包括一个以上地址信 息如 IP地址等,所述地址信息用于分配给网络设备如用户设备 UE进行通信。 然后与所述备用无线分组网关建立路径连接。
上述本发明实施例还包括获取所述主用无线分组网关的备用无线分组 网关的信息的过程, 该过程具体可以包括: 在用户设备附着过程中, 或者在 用户设备与网络侧建立 PDN (Packet Data Network, 分组数据网) 连接过程 中, 或者在用户进行 PDP (Packet Data Protocol, 分组数据协议) 激活过程 中, 获取所述备用无线分组网关的信息(所述备用无线分组网关可以是用户 地址所在地址池对应的备用无线分组网关,也可以是所述主用无线分组网关 的所有备用无线分组网关), 所述备用无线分组网关由主用无线分组网关进 行选择,具体可以是所述主用无线分组网关在无线分组网关资源池中进行选 择, 所述无线分组网关资源池由多个独立的无线分组网关组成, 拥有一段相 同的地址池的无线分组网关互为主备; 或者, 获取所述主用无线分组网关发 送的表示地址池与备用无线分组网关的对应关系的信息, 并从所述对应关系 的信息中获取所述备用无线分组网关的信息,所述表示地址池与备用无线分 组网关的对应关系的信息具体可以是地址池与备用无线分组网关的对应关 系信息, 或 APN (Access Point Name, 接入点名称)与备用无线分组网关的 对应关系信息, 或 PDN与备用无线分组网关的对应关系信息等等; 或者, 在用户设备的服务移动性管理网元发生改变时,获取源移动性管理网元发送 的所述备用无线分组网关的信息; 或者, 通过配置的无线分组网关之间的备 用关系获取所述主用无线分组网关的备用无线分组网关, 或者, 通过 DNS (Domain Name System, 域名管理系统)解析所述主用无线分组网关相关的 信息获取所述备用无线分组网关的信息,所述主用无线分组网关相关的信息 具体可以包括包含主用无线分组网关信息(如地址信息、别名等等)的 APN, 或 APN+主用无线分组网关地址, 或主用无线分组网关地址, 或主用无线分 组网关别名等等。 其中, 所述备用无线分组网关的信息具体可以是备用无线 分组网关的地址、 别名等等可以用于标识所述无线分组网关的信息。
上述主用无线分组网关的备用无线分组网关的信息具体可以由当前为 用户提供服务的移动性管理网元或者服务网关实体获取。
上述本发明实施例中,所述选择所述主用无线分组网关的备用无线分组 网关的过程具体可以包括: 根据获取的所述备用无线分组网关的信息, 选择 用户地址所在地址池的备用无线分组网关。 例如, 如果是根据表示地址池与 备用无线分组网关的对应关系的信息中获取所述备用无线分组网关的信息, 则可以根据所述地址池与备用无线分组网关的对应关系, 为用户设备选择与 该用户设备的地址所在地址池对应的备用无线分组网关; 如果是通过其他方 式获取所述备用无线分组网关的信息, 则根据所述备用无线分组网关的信 息,从中为用户设备选择与该用户设备的地址所在地址池对应的备用无线分 组网关。
上述本发明实施例中, 所述与所述备用无线分组网关的路径建立后, 所 述备用无线分组网关通过发布动态路由段信息更新用户的下行路由, 因此可 以避免每个用户都发布一条主机路由。
为了及时归还 IP地址, 防止主、 备用无线分组网关重复分配 IP地址, 上述本发明实施例中, 主用无线分组网关恢复可用后, 释放所述主用无线分 组网关和所述备用无线分组网关的相同的地址池的承载。 完成该操作后, 所 述备用无线分组网关向所述主用无线分组网关发送其释放的地址池信息,所 述主用无线分组网关激活所述地址池。
其中,所述释放所述主用无线分组网关和所述备用无线分组网关的相同 的地址池的承载的过程具体包括:
(一)获取所述主用无线分组网关的地址和所述备用无线分组网关的地 址; 根据所述主用无线分组网关的地址释放所述主用无线分组网关 PDN承 载; 根据所述备用无线分组网关的地址释放所述备用无线分组网关的 PDN 承载, 所述 PDN承载为所述主、 备用无线分组网关的相同的地址池的 PDN 承载;
或(二)释放所述备用无线分组网关中与主用无线分组网关相同的地址 池;
或 (三) 去激活所述备用无线分组网关。
为了及时归还 IP地址, 防止主、 备用无线分组网关重复分配 IP地址, 还提供了另外一种解决方案, 具体可以是: 当所述主用无线分组网关恢复可 用时,所述主用无线分组网关向所述备用无线分组网关发送地址池使用查询 请求; 所述备用无线分组网关向所述主用无线分组网关发送空闲地址信息。
在本发明实施例中, 所述无线分组网关具体可以是 PGW、 GGSN (Gateway GPRS Support Node,网关 GPRS支持节点, GPRS, General Packet Radio Service, 通用分组无线业务)、 PDSN (Packet Data Serving Node, 分组 数据服务节点)、 ASN-GW (Access Service Network Gateway, 接入服务网网 关)、 PDG (Packet Data Gateway, 分组数据网关) 等。
下面将结合附图对本发明实施例在实际应用过程中的具体实现方式进 行详细的说明。
应用实施例一
在如图 1所示的系统中, PGWPOOL (PGW资源池)中包含多个 PGW, 每个 PGW划分多个地址池, 拥有一段相同地址池的 PGW互为备份, 例如 PGW1和 PGW2共用地址池 1, 因此所述 PGW1和 PGW2互为备份 PGW, PGW2和 PGW3共用地址池 2, 因此所述 PGW2和 PGW3互为备份 PGW。
在 UE (User Equipment, 用户设备) 的附着过程中, 当建立 PDN连接 时, 主用 PGW在 PGWPOOL (PGW资源池)中查找对应的备用 PGW或者 备用 PGW列表,并将所述备用 PGW或者备用 PGW列表的信息在缺省承载 建立响应中通知移动性管理网元。其具体实现过程如图 2所示, 可以包括如 下步骤:
步骤 21、 UE 发送附着请求消息到移动性管理网元, 其中, 针对 GERAN/UTRAN (GSM/EDGE无线接入网 /通用陆地无线接入网)网络而言, 所述移动性管理网元为 SGSN (Serving GPRS Support Node, 服务 GPRS支 持节点),针对 EUTRAN (演进的 UMTS无线接入网, UMTS Universal Mobile Telecommunications System, 通用移动通信系统) 网络而言, 移动性管理网 元为 MME (Mobility Management Entity, 移动管理实体), 对于非 3GPP网 络而言, 移动性管理网元指非 3GPP IP接入网关;
步骤 22、 UE与移动性管理网元和 HSS (Home Subscriber Server, 归属 网络服务器) 执行鉴权操作;
步骤 23、 移动性管理网元和 HSS之间执行位置更新和插入签约数据流 程, 具体操作方式可以是, 将移动性管理网元的地址注册到 HSS 中, 同时 HSS将 UE的签约数据插入到移动性管理网元中;
步骤 24、 移动性管理网元获取所述 UE的签约数据, 根据其中 UE签约 的缺省 APN选择主用 PGW (本应用实施例中,选择图 1所示系统中的 PGW2 为主用 PGW), 并获取所述 PGW2的地址,然后发送创建缺省承载请求消息 到 SGW进行缺省 PDN连接的创建,所述移动性管理网元发送的创建缺省承 载请求消息中携带 PGW2地址、 EPS bearer ID (Evolved Packet System bearer Identity, 演进的分组系统承载标识) 等信息;
步骤 25、 SGW在 EPS承载表中为所述 UE新建上下文, 同时根据所述 移动性管理网元发送的创建缺省承载请求消息中的 PGW2 地址向所述 PGW2发送创建缺省承载请求消息, 所述 SGW发送的创建缺省承载请求消 息中携带 SGW地址、 SGW用户面 TEID (Tunnel Endpoint Identifier, 隧道 端点标识) 和 SGW控制面 TEID等信息;
步骤 26、 所述 PGW2返回创建缺省承载响应消息到 SGW, 所述 PGW2 发送的创建缺省承载响应消息中携带 PGW2地址、 PGW2 控制面 TEID、 PGW2用户面 TEID、 EPS bearer ID和备用 PGW信息或者备用 PGW列表信 息等信息, 其中, 所述备用 PGW信息或者备用 PGW列表信息可以是备用 PGW的地址或者别名等等用于识别所述备用 PGW的标识信息, 由 PGW2 (主用 PGW) 在 PGW资源池中获取;
步骤 27、 SGW返回创建缺省承载响应消息给移动性管理网元, 所述 SGW发送的创建缺省承载相应消息中携带 SGW地址、 SGW用户面 TEID、 SGW控制面 TEID和所述备用 PGW信息或者备用 PGW列表信息;
步骤 28、移动性管理网元获取根据 SGW发送的创建缺省承载响应消息 获取所述备用 PGW的信息或者备用 PGW列表的信息, 并发送附着接受消 息给 UE;
如果 UE的签约数据允许跟非 3GPP互通, 则继续执行如下操作: 移动 性管理网元发送更新位置请求消息到 HSS,消息中携带 UE使用的缺省 PDN 连接的 APN和 PGW2 (主用 PGW) 地址信息; HSS保存 UE使用的 APN 和 PGW2地址信息, 返回位置更新响应消息到移动性管理网元。
上述处理过程中, 如果需要和网络中的 PCRF (Policy and Charging Rule Function, 策略和计费规则功能实体) 交互获取 PCC (Policy Control and Charging, 策略控制和计费) 规则, 则在步骤 25和步骤 26之间还可以包括 如下步骤: 所述 PGW2通过所述 PCRF获取缺省 PCC规则。
上述获取的备用 PGW 的信息可以是所述主用 PGW对应的所有备用 PGW的信息, 也可以是与 UE地址所在地址池对应的备用 PGW信息。
经过上述 UE附着的操作过程后, 移动性管理实体获取了 PGW2 (主用 PGW) 对应的备用 PGW信息或者备用 PGW列表信息, 则在后续的操作过 程中, 如果所述 PGW2发生故障或与所述 PGW2的链接路径不可用时, 移 动性管理实体可以根据获取的备用 PGW信息为 UE正确选择备用的 PGW。 例如, 在图 1所示的系统中, UE地址所在地址池为地址池 1, 如果获取的 备用 PGW信息仅为地址池 1对应的 PGW1 的信息, 则选择 PGW1为备用 PGW, 如果获取的备用 PGW信息为 PGW1和 PGW3的信息, 则需要进一 步判断所述 PGW1和 PGW3中是否包含地址池 1, 由于 PGW1中包含地址 池 1, 因此选择所述 PGW1作为备用 PGW, 并将用户切换到备用 PGW上继 续为 UE服务 (UE的 IP地址不变), 后续当 PGW2恢复正常使用时, 则仍 然调整 PGW2作为当前为 UE服务的 PGW, PGWl为备用 PGW。
由上述描述可知,应用实施例一给出了在 UE附着过程中获取备用 PGW 或者备用 PGW列表, 并进行主、 备用 PGW切换的方法, 实现了设备冗余 及基于 PGW POOL的容灾, 提高了业务的稳定性。
应用实施例二
本发明应用实施例给出了一种在 PDN连接建立过程中获取备用 PGW信 息或者备用 PGW列表信息的实现方式, 其具体实现方式如图 3所示, 可以 包括如下步骤:
步骤 31、 UE向移动性管理网元发起 PDN连接请求消息, 所述 PDN连 接请求消息中携带 APN和 PDN Address Allocation (PDN地址分配)等信息。
步骤 32、移动性管理网元根据所述 PDN连接请求消息中携带的 APN选 择主用 PGW, 并获取所述主用 PGW的地址,然后发送创建缺省承载请求消 息到 SGW进行缺省 PDN连接的创建,所述移动性管理网元发送的创建缺省 承载请求消息中携带主用 PGW地址和 EPS bearer ID等信息;
步骤 33、 SGW在 EPS承载表中为所述 UE新建上下文, 同时根据所述 移动性管理网元发送的创建缺省承载请求消息中的主用 PGW地址向所述主 用 PGW发送创建缺省承载请求消息, 所述 SGW发送的创建缺省承载请求 消息中携带 SGW地址、 SGW用户面 TEID和 SGW控制面 TEID等信息; 步骤 34、 所述主用 PGW返回创建缺省承载响应消息到 SGW, 所述主 用 PGW发送的创建缺省承载响应消息中携带主用 PGW地址、主用 PGW控 制面 TEID、 主用 PGW用户面 TEID、 EPS bearer ID和备用 PGW信息或者 备用 PGW列表信息等信息,其中,所述备用 PGW信息或者备用 PGW列表 信息可以是备用 PGW的地址或者别名等等用于识别所述备用 PGW的标识 信息, 由主用 PGW在 PGW资源池中获取;
步骤 35、 SGW返回创建缺省承载响应消息给移动性管理网元, 所述 SGW发送的创建缺省承载相应消息中携带 SGW地址、 SGW用户面 TEID、 SGW控制面 TEID和所述备用 PGW信息或者备用 PGW列表信息;
步骤 36、 移动性管理网元发送承载建立请求消息给 eNodeB, 所述承载 建立请求消息中还包括 PDN连接接受消息;
步骤 37、 eNodeB和 UE之间进行 RRC (Radio Resource Control, 无线 资源控制协议)连接重配置, eNodeB在所述 RRC连接重配置过程中将收到 的 PDN连接接受消息转发给 UE;
步骤 38、 eNodeB 发送承载建立响应消息给移动性管理网元, 所述 eNodeB 发送的承载建立响应消息中包含 eNodeB 地址、 eNodeB 的用户面 TEID和 eNodeB的控制面 TEID。
步骤 39、移动性管理网元将所述 eNodeB地址、 eNodeB的用户面 TEID 添加到 SGW中, 以更新所述信息。
如果 UE的签约数据允许跟非 3GPP互通, 则继续执行如下操作: 移动 性管理网元发送更新位置请求消息到 HSS,消息中携带 UE使用的缺省 PDN 连接的 APN和主用 PGW地址信息; HSS保存 UE使用的 APN和主用 PGW 地址信息, 返回位置更新响应消息到移动性管理网元。
上述处理过程中, 如果需要从 PCRF交互获取 PCC规则, 则在步骤 33 和步骤 34之间还可以包括如下步骤:所述主用 PGW通过所述 PCRF获取缺 省 PCC规则。
上述获取的备用 PGW 的信息可以是所述主用 PGW对应的所有备用 PGW的信息, 也可以是与 UE地址所在地址池对应的备用 PGW信息。
经过上述建立 PDN连接的操作过程后, 移动性管理实体获取了所述主 用 PGW的备用 PGW或者备用 PGW列表, 则在后续的操作过程中, 如果所 述主用 PGW发生故障或与所述主用 PGW的链接路径不可用时, 移动性管 理实体可以根据 UE地址所在地址池为其选择备用 PGW, 并切换到所述备 用 PGW上继续为 UE服务 (UE的 IP地址不变), 所述备用 PGW可以是所 述移动性管理实体获取的所述备用 PGW, 也可以是所述移动性管理实体从 获取的备用 PGW列表中选择一个备用 PGW。 其中, 如果获取的备用 PGW 信息仅为 UE地址所在地址池对应的备用 PGW 的信息, 则选择所述备用 PGW, 如果获取的备用 PGW信息为主用 PGW对应的所有备用 PGW的信 息, 则需要进一步判断所述备用 PGW是否包含所述地址池, 并选择包含所 述地址池的备用 PGW。
另外, 在上述处理过程的步骤 35中, SGW发送给 MME的创建缺省承 载响应消息中还可以不包含备用 PGW或者备用 PGW列表信息, 即由 SGW 获取所述备用 PGW信息或者备用 PGW列表的信息,当主用 PGW发生故障 或与所述主用 PGW的链接路径不可用时,由 SGW根据 UE地址所在地址池 为其选择备用 PGW, 并切换到备用 PGW上继续为 UE服务(UE的 IP地址 不变), 并将所述备用 PGW调整为主用 PGW。
由上述描述可知,应用实施例二给出了一种基于 PGWPOOL的 PDN连 接建立过程中获取备用 PGW信息的具体实现方式, 移动性管理网元或者 SGW在此过程中获取备用 PGW信息或者备用 PGW列表信息, 从而在主用 PGW出现故障时,可以通过切换到备用 PGW上以实现容灾,提高了系统的 稳定性。
应用实施例三
本应用实施例描述了在 MS (Mobile Station, 移动台) PDP激活过程中 获取备用 GGSN或者备用 GGSN列表的方法, 其具体实现方式如图 4所示, 可以包括如下步骤:
步骤 41、 MS向 SGSN发起激活 PDP请求消息, 所述激活 PDP请求消 息中包含 PDP类型、 PDP地址、 APN和 Qos (Quality of Service, 服务质量) 等信息;
步骤 42、 SGSN发送创建 PDP上下文请求消息到主用 GGSN,所述 PDP 上下文请求消息中包含 PDP类型、 PDP地址和 APN等信息;
步骤 43、 主用 GGSN向 SGSN返回创建 PDP上下文响应消息, 所述创 建 PDP上下文相应消息中包含 PDP地址、 主用 GGSN用户面的 TEID、 主 用 GGSN控制面的 TEID、 协商的 Qos和备用 GGSN信息或者备用 GGSN 列表信息, 其中, 主用 GGSN在 GGSN POOL中获取所述备用 GGSN或备 用 GGSN列表, 主用 GGSN和备用 GGSN共用一段相同的地址池, SGSN 收到根据主用 GGSN发送的消息获知所述主用 GGSN的备用 GGSN信息; 步骤 44、 UE与 RAN (Radio Access Network, 无线接入网) 进行无线 承载建立, RAN侧和 SGSN之间进行 Iu承载建立, 从而完成 RAB承载建 步骤 45、 SGSN发送激活 PDP接受消息给 MS, 所述激活 PDP接受消 息中包含 PDP类型、 PDP地址、 Qos等参数;
如果上述步骤 44中发现 Qos发生改变, 则在步骤 44和步骤 45之间还 包括如下步骤:
SGSN需要发送更新 PDP上下文请求消息到 GGSN, 更新 Qos; GGSN 发送更新 PDP上下文响应消息到 SGSN来确认新的 Qos参数。
上述获取的备用 GGSN的信息可以是所述主用 GGSN对应的所有备用 GGSN的信息, 也可以是与 MS地址所在地址池对应的备用 GGSN信息。如 果获取的备用 GGSN信息仅为 MS地址所在地址池对应的备用 GGSN的信 息,则在切换主、备用 GGSN时选择所述备用 GGSN,如果获取的备用 GGSN 信息为主用 GGSN对应的所有备用 GGSN的信息,则在切换主、备用 GGSN 时需要进一步判断所述备用 GGSN是否包含所述地址池,并选择包含所述地 址池的备用 GGSN。
经过上述 PDP激活处理后, 当 SGSN通过路径探测检测到主用 GGSN 发生故障或者与主用 GGSN连接的路径不可用时,可以立即将 MS的服务切 换到备用 GGSN上,实现容灾保护。由于选取的所述备用 GGSN与主用 GGSN 共用一段地址池 (该地址池为 MS地址所在地址池), 因此可以保证 MS的 IP地址不发生改变, 从而与现有技术中的 GGSN容灾技术方案相比, 对于 处理动态 IP地址分配的 MS而言, 在 GGSN切换过程中无需重新进行激活 过程, 可以减小路由震荡, 缩短由于业务中断造成的时延。
应用实施例四
在本发明应用实施例中, 预先在移动性管理网元或 SGW上配置主备 PGW列表,或者,预先在 SGSN上配置主备 GGSN列表。所述主备 PGW (或 主备 GGSN) 列表用于描述各 PGW (或 GGSN) 之间的对应关系, 具体可 以是共用一段地址池的 PGW (或 GGSN) 互为主备, 所述主用 PGW (或主 用 GGSN) 和备用 PGW (或备用 GGSN) 共用一段地址池, 如果所述主用 PGW划分多个地址段, 则不同的地址段可以对应不同的备用 PGW, 另外, 同一地址段也可以对应多个备用 PGW。 当主用 PGW (或主用 GGSN)发生 故障时, 所述移动性管理网元或 SGW (或 SGSN)可以根据所述配置的主备 PGW (或主备 GGSN) 列表选择用户地址所在地址池对应的备用 PGW (或 备用 GGSN) 并切换路径继续为用户提供服务, 同时所述备用 PGW (或 GGSN) 发布主机路由到承载网更新用户的下行路由。 上述过程中, 如果是 SGW上配置了主备 PGW列表, 则所述 SGW在切换路径结束后, 还需要将 更新后的 PGW地址或者别名通知给移动性管理网元。
上述应用实施例四给出了另外一种获取备用 PGW信息或备用 GGSN信 息, 进而实现容灾的实现方式。 由上述描述可以看出, 由于所述备用 PGW (或备用 GGSN) 与主用 PGW (或主用 GGSN) 共用一段地址池, 因此保 证了在切换 PGW (或 GGSN) 的过程中不改变用户的 IP地址, 即用户不需 要重新激活, 因此可以减少由于业务中断造成的时延, 且降低了网络风险。
应用实施例五
本发明应用实施例给出了一种切换 PGW的具体实现方式。 在 PGW需 要维护或者即将发生故障时, 通知所有相关联的移动性管理网元进行 PGW 的重定向操作,具体可以是, PGW将地址池和备用 PGW的对应关系信息(或 者 APN和备用 PGW的对应关系, 或者 PDN连接号和备用 PGW的对应关 系, 等等可以表示一段地址池和备用 PGW的对应关系信息) 通知给移动性 管理网元, 移动性管理网元根据所述对应关系信息选择 UE的地址所在地址 池对应的备用 PGW, 并完成 PGW的重定向操作, 即将故障 PGW上激活的 UE迁移到备用 PGW上, 实现了容灾和负荷分担。 上述处理过程的具体实 现方式如图 5所示, 可以包括如下步骤:
步骤 51、 主用 PGW发送重定向命令 Redirect Command给相关联的 SGW, 所述 Redirect Command中包含 APN和备用 PGW的关系表 (也可以 是其他表示一段地址池和备用 PGW的关系表);
步骤 52、 所述 SGW收到 PGW的重定向命令后, 转发该命令给关联的 MME;
步骤 53、移动性管理网元为 UE选择新的 SGW, 向所述新的 SGW发送 创建缺省承载请求消息, 请求建立缺省承载, 并根据原 SGW发送的重定向 命令中包含的关系表, 选择 UE地址所在地址池对应的备用 PGW, 所述移 动性管理网元发送的创建缺省承载请求消息中携带所述备用 PGW地址、 IMSI ( International Mobile Subscriber Identity, 国际移动用户识别码)、 MSISDN (The Mobile Station ISDN number,移动用户国际号码)、 EPS bearer ID和 PDN地址等信息, 其中, 在创建缺省承载请求消息携带 PDN地址是 为了确保所述 PDN地址与 UE原来的 PDN地址一致;
步骤 54、所述新的 SGW根据所述备用 PGW地址,创建与所述备用 PGW 之间的承载;
步骤 55、所述新的 SGW发送创建缺省承载响应消息给所述移动性管理 网元, 所述新的 SGW发送的创建缺省承载响应消息中携带隧道标识、 所述 新的 SGW地址、 所述新的 SGW用户面的 TEID、 所述新的 SGW控制面的 TEID禾口 EPS bearer ID;
步骤 56、由于 UE的服务 SGW发生改变,因此 MME删除 UE在原 SGW 上的资源, 另外, 还可以删除 UE在所述主用 PGW上的资源;
如果用户的签约数据允许该用户和非 3GPP互通, 则还可以继续执行如 下操作: 更新 UE在 HSS中的 PGW和 APN信息。
上述步骤 53至更新 UE在 HSS中的 PGW和 APN信息的过程可以重复 执行, 直到同一地址池的用户全部完成所述 PGW切换工作。
上述处理过程完成后, 还需要进行如下操作: 备用 PGW发布主机路由 段给业务网关, 这样可以避免每个 UE都发布一条主机路由。
上述处理过程的步骤 53 中, 如果所述移动性管理网元发送的创建承载 请求消息中不包含 PDN地址, 为了确保所述 PDN地址与 UE原来的 PDN 地址一致, 则所述主用 PGW 作为 DHCP ( Dynamic Host Configuration Protocol, 动态主机配置协议) 客户端通过用户标识向 DHCP服务器请求获 取 PDN地址。
本发明应用实施例五给出了一种通过切换 PGW实现容灾的具体实现过 程, 由上述描述可知, 由于在切换 PGW的过程中保证了 UE地址所在地址 池不变, 因此 UE在更换 PGW时无需更换 IP地址, 即不需要进行重新激活 的过程, 因此降低了网络风险, 减少了由于业务中断造成的时延。
应用实施例六
下面以 PGW为例说明切换无线分组网关的一种实现方式。
本发明应用实施例六给出了另外一种切换 PGW 的具体实现方式。 在 PGW需要维护或者即将发生故障时, 通知所有相关联的移动性管理网元进 行 PGW的重定向操作, 具体可以是, PGW将地址池和备用 PGW的对应关 系信息(或者 APN和备用 PGW的对应关系,或者 PDN连接号和备用 PGW 的对应关系, 等等可以表示一段地址池和备用 PGW的对应关系信息) 通知 给移动性管理网元, 移动性管理网元根据所述对应关系信息选择 UE的地址 所在地址池对应的备用 PGW, 并完成 PGW的重定向操作, 即将故障 PGW 上激活的用户迁移到备用 PGW上, 实现了容灾和负荷分担。 上述处理过程 的具体实现方式如图 6所示, 具体可以包括如下步骤:
步骤 61、 主用 PGW发送重定向命令 Redirect Command给相关联的 SGW, 所述 Redirect Command中携带 APN和备用 PGW的关系表 (也可以 是其他表示一段地址池和备用 PGW的关系表);
步骤 62、 所述 SGW收到 PGW的重定向命令后, 转发该命令给所有关 联的移动性管理网元;
步骤 63、 移动性管理网元发送承载更新请求消息给 SGW, 并根据所述 SGW发送的重定向命令选择备用 PGW, 具体的选择备用 PGW的方法与应 用实施例五中步骤 53 的方法相同, 所述承载更新请求消息中携带用户标识 和备用 PGW地址、 APN和 EPS bearer ID;
步骤 64、 SGW根据步骤 63中移动性管理网元发送的承载更新请求消息 与所述备用 PGW进行承载创建和更新;
步骤 65、 SGW向移动性管理网元发送承载更新响应, 通知所述移动性 管理网元路径切换完成;
如果用户的签约数据允许该用户和非 3GPP互通,则继续执行如下操作: 更新用户在 HSS中的 PGW和 APN信息。
上述步骤 63至更新用户在 HSS中的 PGW和 APN信息的操作可以重复 多次, 直到同一地址池中的用户全部完成 PGW的切换。
上述处理过程完成后, 所述备用 PGW发布主机路由段或者主机路由给 业务网关。 本发明应用实施例六给出了另外一种通过切换 PGW实现容灾的具体实 现过程, 与应用实施例五提供的实现方案比较, 本发明应用实施例六提供的 技术方案无需为用户选择新的 SGW即可完成 PGW的切换过程。
应用实施例七
下面以 PGW为例说明切换无线分组网关的一种实现方式。
本发明应用实施例七给出了第三种切换 PGW的具体实现方式。 其中, 在主用 PGW需要维护或者故障时,所述主用 PGW通知 SGW做重定向操作, SGW切换路径结束后, 将备用 PGW地址通知给 MME。 如图 7所示, 其具 体实现方式可以包括如下步骤:
步骤 71、 主用 PGW发送重定向命令 Redirect Command给相关联的 SGW, 所述重定向命令中包含 APN和备用 PGW的关系表 (也可以是其他 表示一段地址段和备用 PGW的关系表);
步骤 72、 SGW根据所述对应关系表选择 UE地址所在地址池对应的备 用 PGW, 并建立与所述备用 PGW的承载;
步骤 73、 SGW发送更新上下文消息到 MME以完成上下文更新, 所述 更新上下文消息中包含所述备用 PGW地址、 APN、 EPS Bearer ID和用户标 识等信息;
如果用户的签约数据允许该用户和非 3GPP互通,则继续进行如下操作: 更新用户在 HSS中的 PGW和 APN信息。
上述步骤 72到更新用户在 HSS中的 PGW和 APN信息的操作可以重复 执行, 直到同一地址池的用户全部完成 PGW的切换。
上述处理过程完成后, 所述备用 PGW发布主机路由段或主机路由给业 务网关, 这样可以避免每个用户都发布一条主机路由。
本发明应用实施例七给出了一种通过切换 PGW实现容灾的具体实现过 程, 由上述描述可知, 由于在切换 PGW的过程中保证了备用 PGW拥有 UE 地址所在地址池, 因此 UE在更换 PGW时无需更换 IP地址, 即不需要进行 重新激活的过程, 因此降低了网络风险, 减少了由于业务中断造成的时延。 应用实施例八
当主用无线分组网关恢复可用后, 备用无线分组网关还需要归还 IP地 址, 保证主用和备用的无线分组网关不重复分配 IP地址。 本发明应用实施 例八以 PGW为例, 给出了一种实现方法, 其具体实现方式可分为删除 PDN 承载和归还 IP地址两个过程, 其中, 删除 PDN承载的过程如图 8所示, 可 以包括如下步骤:
步骤 81、 UE发送 PDN释放请求消息, 所述 PDN释放请求消息中携带 LBI (Linked EPS Bearer ID, 关联 EPS承载标识), 所述 LBI是跟所述 PDN 关联的缺省承载参数;
步骤 82、 MME向 SGW发送删除承载请求消息, 所述删除承载请求消 息中携带 MME用户面的 TEID、 MME控制面的 TEID和 LBI;
步骤 83、 SGW根据 TEID标识和 LBI参数, 向主用 PGW发送删除承 载请求消息, 所述删除承载请求消息中包含 SGW用户面的 TEID、 SGW控 制面对 TEID和 LBI;
步骤 84、 主用 PGW和 PCRF交互, 所述主用 PGW通知 PCRF响应的 EPS承载被删除;
步骤 85、 主用 PGW回复删除承载响应消息给 SGW;
步骤 86、 SGW与备用 PGW (即切换前的主用 PGW)、 PCRF交互, 删 除备用 PGW上相应 PDN连接的承载, 具体可以是 SGW向备用 PGW发送 删除承载请求消息, 所述删除承载请求消息中包含 SGW用户面的 TEID、 SGW控制面对 TEID和 LBI; 所述备用 PGW和 PCRF交互, 通知 PCRF相 应的 EPS 承载被删除; 备用 PGW回复删除承载响应消息给 SGW; 所述备 用 PGW发布主机路由, 更新下行路由;
步骤 87、 SGW回复删除承载响应消息给 MME;
步骤 88、 MME向 eNodeB发起删除承载资源消息, 删除 eNodeB上与 所述 PDN相关的无线承载资源,所述删除承载资源消息中还携带 PDN断开 响应, eNodeB向 UE转发所述删除承载资源消息, 将 PDN断开响应携带给 UE。
如果用户的签约数据允许该用户和非 3GPP 互通, 则需要更新用户在 HSS中的 PGW和 APN信息。
上述处理过程中, 步骤 83~85与步骤 86之间不存在时序先后, 即删除 主用 PGW的承载与删除备用 PGW的承载过程在时序上无先后顺序。
在上述步骤 82中,所述删除承载请求消息中还可以携带主用 PGW地址 和备用 PGW地址, 通过所述主备 PGW地址告知 SGW需要删除主备 PGW 上相应的 PDN连接对应的承载。 另外, 如果主用 PGW和备用 PGW对应的 SGW不相同, 则 MME分别向两个 SGW发送删除承载请求消息。
完成 PDN承载删除过程后,备用 PGW上原先激活的地址或地址池被去 激活, 此时, 将释放的地址或地址池通知给主用 PGW, 以实现 IP地址的归 还, 其具体实现过程为: 备用 PGW发送地址 (或地址池) 释放通知给主用 PGW, 所述消息中携带被释放的地址(或地址池)。 则所述地址(或地址池) 在主用 PGW上可用, 在备用 PGW上不可用。
由上述描述可知, 本发明实施例给出了归还 IP地址, 保证不重复分配 IP地址的具体实现方案, 对于动态地址分配的用户而言,在切换无线分组网 关后, 无需改变 IP地址, 从而降低了网络风险, 避免了由于业务中断造成 的时延。
应用实施例九
当用户由于位置改变需要切换 MME或 SGSN时, 新的 MME或 SGSN 获得无线分组网关主备关系列表。以 PGW为例,所述切换过程如图 9所示, 具体可以包括如下步骤:
步骤 91、 UE上报测量报告给源接入网, 源接入网根据 UE的测量报告 决定发起切换流程, 即发送切换请求消息给源 MME (或源 SGSN); 步骤 92、 源 MME (或源 SGSN) 选择目标 MME (或目标 SGSN), 并 向所述目标 MME (或 SGSN)发送转发切换请求消息, 所述源 MME (或源 SGSN)发送的转发切换请求消息中携带 UE的上下文信息, 包括主用 PGW 地址、 主用 PGW用户面 TEID、 主用 PGW控制面 TEID、 SGW地址、 SGW 用户面 TEID和 SGW控制面 TEID,还包括备用 PGW信息(地址或者别名), 以便主 PGW发生故障后可以实现容灾。
步骤 93、 目标 MME (或目标 SGSN) 为用户分配上下文, 并向目标接 入网发送切换请求消息, 所述目标 MME (或目标 SGSN) 发送的切换请求 消息中携带上行数据的用户面 TEID、 上行数据的控制面 TEID和上行数据 地址;
步骤 94、 目标接入网发送切换请求响应消息给目标 MME (或目标 SGSN);
步骤 95、 目标 MME (或 SGSN)发送转发切换请求响应消息给源 MME (或 SGSN);
步骤 96、 源 MME (或 SGSN) 发送切换命令给源接入网;
步骤 97、 源接入网将所述切换命令发送给 UE, 指示 UE接入到目标接 入网;
步骤 98、 UE切换到目标接入网, 更新相应的承载上下文, 以继续原有 的业务;
步骤 99、 跟踪区发生变化, UE发起跟踪区更新流程, 给 UE分配一个 新的 GUTI (Globally Unique Temporary Identity, 全局唯一临时标识)。
由上述描述可知, 当 MME或 SGSN发生切换时, 目标 MME或 SGSN 会获取主用无线分组网关信息及相应的备用无线分组网关信息, 当主用无线 分组网关发生故障时, 仍然可以通过切换无线分组网关从而实现容灾。
应用实施例十
本发明应用实施例十给出了当用户进入一个新的跟踪区或者路由区时, 基于主备无线分组网关的处理过程, 其具体实现方式如图 10所示, 具体可 以包括如下步骤:
步骤 101、 UE 向其所在接入网发起跟踪区更新 (或路由区更新) 请求 消息, 所述跟踪区更新(或路由区更新)请求消息中携带用户的全局临时标 识;
步骤 102、 接入网为所述 UE选择一个新的 MME (或新的 SGSN), 并 将 UE发送的 TAU(或 RAU )请求消息转发给所述新的 MME(或新的 SGSN ), 及目标 MME (或目标 SGSN);
步骤 103、 所述目标 MME (或目标 SGSN)根据 UE的全局临时标识值 得出源 MME (或源 SGSN), 并发送上下文请求消息到所述源 MME (或源 SGSN) 以获取 UE的上下文信息;
步骤 104、 源 MME (或源 SGSN) 向目标 MME (或目标 SGSN) 发送 上下文响应消息, 所述上下文响应消息中包含 UE的上下文信息, 该 UE上 下文信息包括: 承载上下文、 移动性管理上下文、 SGW信令地址 UE的用 户面 TEID和 UE的控制面 TEID, 还有相关的备用 PGW信息或者 PGW列 表信息, 以便主 PGW发生故障后可以实现容灾;
步骤 105、 目标 MME (或目标 SGSN) 执行认证过程;
步骤 106、 目标 MME (或目标 SGSN) 发送上下文应答消息给源 MME (或源 SGSN);
步骤 107、 目标 MME (或目标 SGSN) 更新 SGW中 UE上下文信息; 步骤 108、 目标 MME (或目标 SGSN) 更新 HSS中 UE的 MME (或 SGSN) 信息;
步骤 109、 目标 MME (或目标 SGSN) 发送 TAU (或 RAU) 接受消息 给 UE;
步骤 1010、 UE发送 TAU (或 RAU) 完成消息给目标 MME (或目标 SGSN)。 由上述描述可知, 当用户进入一个新的 TA区或者 RA区时, 为用户进 行 MME或 SGSN的切换, 目标 MME或 SGSN会获取主用无线分组网关信 息及相应的备用无线分组网关信息, 当主用无线分组网关发生故障时, 仍然 可以通过切换无线分组网关从而实现容灾。
应用实施例十一
当主用无线分组网关发生故障后, 获取备用无线分组网关的信息(如地 址信息)还可以通过 DNS查询的方法得到,具体的查询方法可以是解析 APN 获取所述备用无线分组网关的信息, 或者解析 APN+主用无线分组网关地址 获取所述备用无线分组网关的信息,或者解析主用无线分组网关地址获取所 述备用无线分组网关的信息,或者解析主用无线分组网关的别名获取所述备 用无线分组网关的信息。
实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件 来完成, 前述的程序可以存储于一计算机可读取存储介质中, 该程序在执行 时,执行包括上述方法实施例的步骤;而前述的存储介质包括: ROM, RAM, 磁碟或者光盘等各种可以存储程序代码的介质。
应用实施例十二
本发明实施例还提供一种分组数据网络网关设备,用于将用户设备接入 到分组数据网络, 其特征在于, 其结构如图 11 所示, 具体实现结构可以包 括:
无线分组网关选择模块 111, 用于当主用无线分组网关不可用 (如所述 主用无线分组网关发生故障、负载均衡、过载、需要维护或者出现路径故障) 时, 选择所述主用无线分组网关对应的备用无线分组网关, 所述备用无线分 组网关与主无线分组网关拥有一段相同的地址池;
路径建立模块 112, 用于与所述无线分组网关选择模块 111选择的备用 无线分组网关建立路径连接,具体的路径建立模块 112 包括获取所述主用无 线分组网关的承载上下文容器,发送所述承载上下文容器到备用无线分组网 关的模块, 以便备用无线分组网关根据承载上下文容器创建上下文, 路经建 立模块 112还可以包括获取重定向完成标识的模块, 以便备用无线分组网关 根据所述重定向完成标识更新主机路由。
上述分组数据网络网关设备可以被其他无线分组网关设备所代替。
本发明实施例所述装置还可以包括无线分组网关获取模块 113, 所述无 线分组网关获取模块 113具体可以包括:第一获取模块 1131,用于在用户设 备附着过程中,或者在用户设备与网络侧建立分组数据网 PDN连接过程中, 或者在用户设备进行分组数据协议 PDP激活过程中获取一个或多个所述备 用无线分组网关的信息,所述备用无线分组网关由主用无线分组网关根据用 户设备选择; 或者, 第二获取模块 1132, 用于获取所述主用无线分组网关发 送的表示地址池与备用无线分组网关的对应关系的信息, 并从所述对应关系 的信息中获取所述备用无线分组网关的信息; 或者, 第三获取模块 1133, 用 于在用户设备的服务移动性管理网元发生改变时,获取源移动性管理网元发 送的一个或多个所述备用无线分组网关的信息; 或者, 第四获取模块 1134, 用于通过配置的无线分组网关之间的备用关系获取所述主用无线分组网关 对应的备用无线分组网关; 或者, 第五获取模块 1135, 用于通过域名管理系 统 DNS解析所述主用无线分组网关相关的信息获取所述备用无线分组网关 的信息; 或者, 第六获取模块 1136, 用于接收创建缺省承载响应消息或者创 建 PDP上下文响应消息或者重定向请求消息, 从所述创建缺省承载响应消 息或者创建 PDP上下文响应消息或者重定向请求消息获取所述备用无线分 组网关的信息。
上述本发明实施例中,所述无线分组网关选择模块具体用于当主用无线 分组网关不可用时, 根据获取的所述备用无线分组网关的信息, 选择用户地 址所在地址池的备用无线分组网关。 例如, 如果是根据表示地址池与备用无 线分组网关的对应关系的信息中获取所述备用无线分组网关的信息,则可以 根据所述地址池与备用无线分组网关的对应关系, 为用户设备选择与该用户 设备的地址所在地址池对应的备用无线分组网关; 如果是通过其他方式获取 所述备用无线分组网关的信息, 则根据所述备用无线分组网关的信息, 从中 为用户设备选择与该用户设备的地址所在地址池对应的备用无线分组网关。
为防止主、 备用无线分组网关重复分配 IP地址, 本发明实施例提供的 设备还包括释放模块, 该模块具体可以用于当主用无线分组网挂恢复可用 后,释放所述主用无线分组网关和所述备用无线分组网关的相同的地址池的 承载。 其中, 所述释放所述主用无线分组网关和所述备用无线分组网关的相 同的地址池的承载的操作具体可以是: (一) 获取所述主用无线分组网关的 地址和所述备用无线分组网关的地址;根据所述主用无线分组网关的地址释 放所述主用无线分组网关 PDN承载; 根据所述备用无线分组网关的地址释 放所述备用无线分组网关的 PDN承载, 所述 PDN承载为所述主、 备用无线 分组网关的相同的地址池的 PDN承载; 或 (二) 释放所述备用无线分组网 关中与主用无线分组网关相同的地址池; 或(三)去激活所述备用无线分组 网关。
上述本发明实施例提供的设备, 由于能够根据获取的备用无线分组网关 的信息,在主用无线分组网关不可用时及时将业务切换到相应的备用无线分 组网关上, 因此可以降低网络风险, 为用户提供更好的服务。 且由于能够及 时释放备用无线分组网关的地址池资源, 因此有效防止了主、 备用无线分组 网关重复分配 IP地址的情况发生。
应用实施例十三
本发明应用实施例十三给出了主用 P-GW 上的用户设备迁移到备用 P-GW上的流程, 当主用无线分组网关不可用时, 如所述主用无线分组网关 发生故障、 负荷均衡、 过载、 需要维护、 负载迁移或者出现路径故障时, 需 要将主用 P-GW上的用户设备迁移到备用 P-GW上,主用 P-GW发送重定向 请求给 S-GW, S-GW将重定向请求发送给 MME。 MME发起在 S-GW和备 用 P-GW之间建立备份承载, 此时不转发数据。 当主用 P-GW地址池中的最 后一个 UE被重定向时, 在重定向请求消息中携带结束标识, 并通知所有相 关的 MME、 S-GW重定向完成。 MME将备用承载升级为主用承载, 并删除 原主用承载信息,逐用户将 HSS上的 P-GW的信息更新为备份 P-GW。 S-GW 发起激活连接备用 P-GW所有备份的承载, 并删除连接主 P-GW的承载。 P-GW向外部 PDN发布主机路由更新, 并开始转发数据和更新 PCRF上的 P-GW信息。 参见附图 12, 具体如下:
步骤 121、 主用 P-GW发送重定向请求消息给 S-GW, 其中, 重定向请 求消息中包含备用 P-GW地址和承载上下文容器,重定向请求消息中还可以 包含用户标识和 /或重定向进行标识,承载上下文容器主要为了让备用 P-GW 重用主用 P-GW的承载上下文信息, 该容器包含 Qos、 PCC规则、 计费信息 以及 DHCP信息等,以便备用 P-GW利用主用 PGW的信息来创建备份承载, 节省网络资源并减少了承载切换时间; 重定向进行标识表示主用 P-GW上
UE的正在重定向到备份 P-GW; 用户标识可以为 IMSI; 本实施例中的重定 向请求消息中以包含备用 P-GW地址、 承载上下文容器和用户标识为例; 步骤 122、 S-GW根据重定向请求消息获知 P-GW的迁移, 并保存备用 P-GW地址信息, S-GW将重定向请求消息发送给 UE所在的 MME;
步骤 123、 MME根据所述重定向请求消息保存用户相关的上下文信息 和备用 P-GW地址信息, 创建备份承载上下文, 并发送创建备份承载请求消 息给 S-GW,其中创建备份承载请求消息中包含备用 P-GW地址、用户标识、 承载上下文容器;
步骤 124、 S-GW创建备份承载上下文, 为备份承载分配新的 TEID, 发 送创建备份承载请求消息给备用 P-GW;
步骤 125、 备用 P-GW创建备份承载上下文, 并为备份承载分配 TEID, 发送创建备份承载响应消息给 S-GW, 其中创建备份承载响应消息包含备用 P-GW的控制面地址、 用户面地址和承载的 TEID信息, 此时 UE的用户面 数据仍然在主用承载上传输; 步骤 126、 S-GW发送创建备份承载响应消息给 MME, MME维护备份 P-GW相关的承载上下文信息, 其中建备份承载响应消息中包含用户标识、 备用 P-GW地址信息和 TEID, 具体为: 用户标识、 备用 P-GW的控制面地 址和控制面 TEID、 备用 P-GW的用户面地址和用户面 TEID;
步骤 127、MME发送重定向完成消息给 S-GW,通知 S-GW重定向完成, 其中重定向完成消息中包含用户标识, 以通知 S-GW哪些 UE已经完成了重 定向;
步骤 128、 S-GW发送重定向完成消息给 P-GW, 以通知 P-GW重定向 完成;
步骤 129、 P-GW对同一个地址段的其余 UE重复执行步骤 121—步骤
128, 直到将同一个地址段内的所有的 UE的承载备份到备用 P-GW上。
步骤 1210、 P-GW发送重定向请求消息给所有相关的 S-GW, P-GW删 除该地址段的所有 UE的信息,所述重定向请求消息中包含重定向完成标识, 表示主用 P-GW上的最后一个 UE将完成重定向到备用 P-GW;
步骤 1211、 S-GW转发重定向请求消息给所有相关的 MME, 其中重定 向请求消息中包含主用 P-GW地址、 备用 P-GW地址、 重定向完成标识; 步骤 1212、 MME获取重定向完成标识后, 将备用 P-GW相关的备份承 载上下文切换为主承载上下文, 并删除原主用 P-GW相关的承载上下文; 步骤 1213、 S-GW发送激活备份承载请求消息给备用 P-GW, 其中激活 备份承载请求消息中包含主用 P-GW地址;
步骤 1214、 备用 P-GW收到消息后, 在 PDN中发布主机路由更新, 即 更新主机路由网段信息;
步骤 1215、 P-GW向 S-GW返回激活备份承载响应消息, 此时 S-GW 和备用 P-GW开始在承载上传输用户面数据;
步骤 1216、 MME发送重定向完成消息给 S-GW。
步骤 1217、 S-GW发送重定向完成消息给 P-GW。 步骤 1218、 MME开始更新 HSS上的各用户的承载的 P-GW信息。 步骤 1219、 备用 P-GW更新 PCRF上的承载的 PCC规则中的 P-GW信 息, 后续业务交互需要下发 PCC规则时, PCRF将最新的 PCC规则下发到 备用 PGW完成承载建立或者修改。
当上述流程中重定向请求消息中不包含用户标识时, MME可以根据预 置策略自行决定迁移那些用户, 其中预置策略中可以包含用户状态、 用户优 先级、 业务优先级等参数。
应用实施例十四
本发明实施例提供了一种移动性管理网元或者服务网关实体, 包括: 接 收模块, 用于接收主用无线分组网关设备发送的备用无线分组网关信息; 选 择模块,用于根据所述备用无线分组网关信息选择所述主用无线分组网关设 备对应的备用无线分组网关; 建立模块, 用于与所述选择的备用无线分组网 关建立路径连接, 其中, 所述备用无线分组网关与所述主用无线分组网关设 备拥有一段相同的地址池。
应用实施例十五
本发明实施例提供了一种基于无线分组网关的容灾系统, 包括: 分组数 据网络网关设备, 用于当所述分组数据网络网关设备不可用时, 根据获取的 备用无线分组网关信息选择所述分组数据网络网关设备对应的备用无线分 组网关,将所述选择的备用无线分组网关信息发送给移动性管理网元或者服 务网关实体, 其中, 所述备用无线分组网关与所述分组数据网络网关设备拥 有一段相同的地址池; 移动性管理网元或者服务网关实体, 用于与所述选择 的备用无线分组网关建立路径连接。
上述分组数据网络网关设备可以被其他无线分组网关设备所代替。 应用实施例十六
本发明实施例提供了一种基于无线分组网关的容灾系统, 包括: 分组数 据网络网关设备, 用于当所述分组数据网络网关设备不可用时, 向移动性管 理网元或者服务网关实体发送备用无线分组网关信息;移动性管理网元或者 服务网关实体,用于根据所述备用无线分组网关信息选择所述分组数据网络 网关设备对应的备用无线分组网关,与所述选择的备用无线分组网关建立路 径连接, 其中, 所述备用无线分组网关与所述分组数据网络网关设备拥有一 段相同的地址池。
上述分组数据网络网关设备可以被其他无线分组网关设备所代替。
应用实施例十七
本发明实施例还提供一种基于无线分组网关的容灾系统,其结构如图 13 所示, 具体实现结构可以包括:
无线分组网关选择装置 131, 用于当主用无线分组网关不可用 (如所述 主用无线分组网关发生故障、负载均衡、过载、需要维护或者出现路径故障) 时, 选择所述主用无线分组网关的备用无线分组网关, 所述备用无线分组网 关与所述主用无线分组网关拥有一段相同的地址池;
路径建立装置 132, 用于与所述无线分组网关选择装置 131选择的备用 无线分组网关建立路径连接。
本发明实施例提供的系统中,所述无线分组网关选择装置 131具体用于 当主用无线分组网关不可用时, 根据获取的所述备用无线分组网关的信息, 选择用户地址所在地址池的备用无线分组网关。
上述本发明实施例中, 所述与所述备用无线分组网关的路径建立后, 所 述备用无线分组网关通过发布动态路由段信息更新用户的下行路由, 因此可 以避免每个用户都发布一条主机路由。
为防止主、 备用无线分组网关重复分配 IP地址, 上述本发明实施例提 供的系统中, 还可以包括释放装置 133, 所述释放装置 133具体可以用于当 主用无线分组网关恢复可用后,释放所述主用无线分组网关和所述备用无线 分组网关的相同的地址池的承载。 其中, 所述释放所述主用无线分组网关和 所述备用无线分组网关的相同的地址池的承载的操作具体是: (一) 获取所 述主用无线分组网关的地址和所述备用无线分组网关的地址;根据所述主用 无线分组网关的地址释放所述主用无线分组网关 PDN承载; 根据所述备用 无线分组网关的地址释放所述备用无线分组网关的 PDN承载,所述 PDN承 载为所述主、 备用无线分组网关的相同的地址池的 PDN承载; 或 (二) 释 放所述备用无线分组网关中与主用无线分组网关相同的地址池; 或(三)去 激活所述备用无线分组网关。 相应的, 当所述释放装置 133完成操作后, 所 述备用无线分组网关向所述主用无线分组网关发送其释放的地址池信息,所 述主用无线分组网关激活所述地址池。
另外, 在上述本发明实施例提供的系统中, 当所述不可用的主用无线分 组网关恢复可用时,所述主用无线分组网关向所述备用无线分组网关发送地 址池使用查询请求;所述备用无线分组网关向所述主用无线分组网关发送空 闲地址信息。
上述本发明实施例提供的系统中, 由于能够根据获取的备用无线分组网 关的信息,在主用无线分组网关不可用时及时将业务切换到相应的备用无线 分组网关上, 因此可以降低网络风险, 为用户提供更好的服务。 且由于能够 及时释放备用无线分组网关的地址池资源, 因此有效防止了主、 备用无线分 组网关重复分配 IP地址的情况发生。
以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并不 局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可 轻易想到的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明 的保护范围应该以权利要求的保护范围为准。

Claims

权利要求书
1、 一种基于无线分组网关的容灾方法, 其特征在于, 包括:
当主用无线分组网关不可用时,根据获取的备用无线分组网关信息选择 所述主用无线分组网关的备用无线分组网关,所述备用无线分组网关与主用 无线分组网关拥有一段相同的地址池;
与所述备用无线分组网关建立路径连接。
2、 根据权利要求 1所述的方法, 其特征在于, 该方法还包括获取所述 主用无线分组网关的备用无线分组网关的信息的过程:
在用户设备附着过程中,或者在用户设备与网络侧建立分组数据网 PDN 连接过程中, 或者在用户设备进行分组数据协议 PDP激活过程中, 获取所 述备用无线分组网关的信息,所述备用无线分组网关由主用无线分组网关选 择;
或者,
接收创建缺省承载响应消息或者创建 PDP上下文响应消息或重定向请 求消息, 从所述创建缺省承载响应消息或者创建 PDP上下文响应消息或者 重定向请求消息获取所述备用无线分组网关的信息;获取所述主用无线分组 网关发送的表示地址池与备用无线分组网关的对应关系的信息, 并从所述对 应关系的信息中获取所述备用无线分组网关的信息;
或者,
在用户设备的服务移动性管理网元发生改变时,获取源移动性管理网元 发送的所述备用无线分组网关的信息;
或者,
通过配置的无线分组网关之间的备用关系获取所述主用无线分组网关 的备用无线分组网关的信息;
或者,
通过域名管理系统 DNS解析所述主用无线分组网关相关的信息获取所 述备用无线分组网关的信息。
3、 根据权利要求 2所述的方法, 其特征在于, 由当前为用户提供服务 的移动性管理网元或者服务网关实体获取所述主用无线分组网关的备用无 线分组网关的信息。
4、 根据权利要求 1~3任意一项所述的方法, 其特征在于, 所述选择所 述主用无线分组网关的备用无线分组网关的过程具体包括:
根据获取所述备用无线分组网关的信息,选择用户设备地址所在地址池 的备用无线分组网关。
5、 根据权利要求 1~3任意一项所述的方法, 其特征在于, 该方法还包 括:
主用无线分组网关恢复可用后,释放所述主用无线分组网关和所述备用 无线分组网关的相同的地址池的承载;
所述备用无线分组网关向所述主用无线分组网关发送其释放的地址池 信息;
所述主用无线分组网关激活所述地址池。
6、 根据权利要求 5所述的方法, 其特征在于, 所述释放所述主用无线 分组网关和所述备用无线分组网关的相同的地址池的承载具体包括:
获取所述主用无线分组网关的地址和所述备用无线分组网关的地址; 根据所述主用无线分组网关的地址释放所述主用无线分组网关 PDN承 载;
根据所述备用无线分组网关的地址释放所述备用无线分组网关的 PDN 承载, 所述 PDN承载为所述主、 备用无线分组网关的相同的地址池的 PDN 承载。
7、 根据权利要求 1~3任意一项所述的方法, 其特征在于, 该方法还包 括:
当所述主用无线分组网关恢复可用时,所述主用无线分组网关向所述备 用无线分组网关发送地址池使用查询请求;
所述备用无线分组网关向所述主用无线分组网关发送空闲地址信息。
8、 根据权利要求 1~3所述的方法, 其特征在于, 所述与备用无线分组 网关建立路径连接具体包括:
获取所述主用无线分组网关的承载上下文容器,发送所述承载上下文容 器到所述备用无线分组网关,所述备用无线分组网关根据所述承载上下文容 器创建上下文。
9、 根据权利要求 8所述的方法, 其特征在于, 所述与备用无线分组网 关建立路径连接还包括:
获取重定向完成标识,所述备用无线分组网关根据所述重定向完成标识 发布主机路由更新。
10、 根据权利要求 1~3所述的方法, 其特征在于, 所述方法还包括: 所述备用无线分组网关更新策略与计费规则功能设备中的无线分组网 关信息。
11、 一种无线分组网关设备, 用于将用户设备接入到分组数据网络, 其 特征在于, 包括:
无线分组网关选择模块, 用于当主用无线分组网关不可用时, 根据获取 的备用无线分组网关信息选择所述主用无线分组网关对应的备用无线分组 网关, 所述备用无线分组网关与主用无线分组网关拥有一段相同的地址池; 路径建立模块,用于与所述无线分组网关选择模块选择的备用无线分组 网关建立路径连接。
12、 根据权利要求 11所述的设备, 其特征在于, 所述设备还包括无线 分组网关获取模块, 所述无线分组网关获取模块具体包括:
第一获取模块, 用于在用户设备附着过程中, 或者在用户设备与网络侧 建立分组数据网 PDN连接过程中, 或者在用户设备进行分组数据协议 PDP 激活过程中, 获取所述备用无线分组网关的信息, 所述备用无线分组网关由 主用无线分组网关根据用户设备选择;
或者,
第二获取模块,用于获取所述主用无线分组网关发送的表示地址池与备 用无线分组网关的对应关系的信息, 并从所述对应关系的信息中获取所述备 用无线分组网关的信息;
或者,
第三获取模块, 用于在用户设备的服务移动性管理网元发生改变时, 获 取源移动性管理网元发送的所述备用无线分组网关的信息;
或者,
第四获取模块,用于通过配置的无线分组网关之间的备用关系获取所述 主用无线分组网关对应的备用无线分组网关;
或者,
第五获取模块, 用于通过域名管理系统 DNS解析所述主用无线分组网 关相关的信息获取所述备用无线分组网关的信息;
或者,
第六获取模块, 用于接收创建缺省承载响应消息或者创建 PDP上下文 响应消息或者重定向请求消息,从所述创建缺省承载响应消息或者创建 PDP 上下文响应消息或者重定向请求消息获取所述备用无线分组网关的信息。
13、 根据权利要求 11或 12所述的设备, 其特征在于, 所述无线分组网 关选择模块具体用于当主用无线分组网关不可用时,根据获取的所述备用无 线分组网关的信息, 选择用户设备地址所在地址池的备用无线分组网关。
14、 根据权利要求 11或 12所述的设备, 其特征在于, 该设备还包括释 放模块:
用于当主用无线分组网挂恢复可用后,释放所述主用无线分组网关和所 述备用无线分组网关的相同的地址池的承载。
15、 根据权利要求 11或 12所述的设备, 其特征在于, 所述路径建立模 块包括获取所述主用无线分组网关的承载上下文容器,发送所述承载上下文 容器到所述备用无线分组网关的模块。
16、 一种移动性管理网元或者服务网关实体, 其特征在于, 包括: 接收模块, 用于接收主用无线分组网关设备发送备用无线分组网关信 息;
选择模块,用于根据所述备用无线分组网关信息选择所述主用无线分组 网关设备对应的备用无线分组网关;
建立模块, 用于与所述选择的备用无线分组网关建立路径连接, 其中, 所述备用无线分组网关与所述主用无线分组网关设备拥有一段相同的地址 池。
17、 一种基于无线分组网关的容灾系统, 其特征在于, 包括: 无线分组网关设备, 用于当所述无线分组网关设备不可用时, 根据获取 的备用无线分组网关信息选择所述无线分组网关设备对应的备用无线分组 网关,将所述选择的备用无线分组网关信息发送给移动性管理网元或者服务 网关实体, 其中, 所述备用无线分组网关与所述无线分组网关设备拥有一段 相同的地址池;
移动性管理网元或者服务网关实体,用于与所述选择的备用无线分组网 关建立路径连接。
18、 一种基于无线分组网关的容灾系统, 其特征在于, 包括: 无线分组网关设备, 用于当所述无线分组网关设备不可用时, 向移动性 管理网元或者服务网关实体发送备用无线分组网关信息;
移动性管理网元或者服务网关实体,用于根据所述备用无线分组网关信 息选择所述无线分组网关设备对应的备用无线分组网关,与所述选择的备用 无线分组网关建立路径连接, 其中, 所述备用无线分组网关与所述无线分组 网关设备拥有一段相同的地址池。
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