WO2017076088A1 - 服务网关的管理方法及装置 - Google Patents

服务网关的管理方法及装置 Download PDF

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Publication number
WO2017076088A1
WO2017076088A1 PCT/CN2016/093254 CN2016093254W WO2017076088A1 WO 2017076088 A1 WO2017076088 A1 WO 2017076088A1 CN 2016093254 W CN2016093254 W CN 2016093254W WO 2017076088 A1 WO2017076088 A1 WO 2017076088A1
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Prior art keywords
sgw
address
mme
user terminal
information
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PCT/CN2016/093254
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English (en)
French (fr)
Inventor
朱进国
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中兴通讯股份有限公司
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Publication of WO2017076088A1 publication Critical patent/WO2017076088A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/17—Selecting a data network PoA [Point of Attachment]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/025—Services making use of location information using location based information parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

Definitions

  • the present application relates to, but is not limited to, the field of communications, and in particular, to a method and an apparatus for managing a service gateway.
  • FIG. 1 is a schematic diagram of a network architecture of a fourth generation mobile communication technology (4G) evolved packet system (Evolved Packet System, abbreviated as EPS) in the related art.
  • 4G fourth generation mobile communication technology
  • EPS evolved packet system
  • the NE functions in the EPS are as follows:
  • the terminal (UE, User Equipment) accesses the core network through the air interface and the 4G base station, and accesses the service network through an Evolved Packet Core (EPC).
  • EPC Evolved Packet Core
  • the terminal can be in an idle state and a connected state.
  • a radio resource connection Radio Resource Connection, RRC for short
  • RRC Radio Resource Connection
  • the eNodeB is a 4G base station and provides radio access for the UE.
  • the main function is to perform radio resource control and scheduling, and provide mobility management in the base station.
  • the Mobility Management Element is the core network control plane network element, which mainly authenticates and signs the UE.
  • the MME selects a Serving Gateway (SGW) and a Packet Data Network Gateway (PGW) for the user.
  • SGW Serving Gateway
  • PGW Packet Data Network Gateway
  • the MME may initiate paging to the user according to the saved user context.
  • the MME also provides mobility management across base stations.
  • the SGW is a user plane network element, an anchor point when the user moves across the base station, and provides a roaming interface with the PGW in the roaming situation.
  • the SGW caches the user data and triggers the MME to page the user.
  • the PGW is a user plane network element, which allocates an Internet Protocol (IP) address to the UE and accesses the service network.
  • IP Internet Protocol
  • the PGW is the IP layer anchor and will not change, thus ensuring business continuity.
  • S1-MME, S11, and S5/S8-C are control plane interfaces, based on the GPRS Tunneling Protocol-C (GTP-C), and transmit signaling plane data; S1-U
  • the S5/S8-U is a user interface.
  • the user plane data is transmitted based on the GPRS Tunneling Protocol-U (GTP-U).
  • the embodiment of the invention provides a method and a device for managing a service gateway, so as to at least solve the problem that the control plane and the forwarding plane of the service gateway are not perfect in the related art.
  • a method for managing a service gateway including:
  • the mobility management unit learns the network protocol (IP) address of the serving gateway (SGW-U) of the forwarding plane through the Domain Name System (DNS), and sends the IP address to the serving gateway (SGW-C) of the control plane.
  • IP network protocol
  • SGW-U and the SGW-C are two network elements separated from a serving gateway in an evolved packet system.
  • the MME knows the IP address of the SGW-U through the DNS, including:
  • the MME obtains an IP address list of the SGW-U from the DNS according to current location information of the user terminal, and the MME selects an IP address of the SGW-U from the IP address list.
  • the MME learns, according to the DNS, that the IP address of the SGW-U includes:
  • the MME is based on the service area of the SGW-U and the service user type of the SGW-U And the service type of the SGW-U, and selecting an IP address of the SGW-U from the IP address list of the SGW-U.
  • the method further includes:
  • the MME selects the SGW-C from the IP address list of the SGW-C according to the capacity weight of the SGW-U.
  • the sending the IP address to the SGW-C includes: sending, by the MME, a message to the SGW-C, where the message carries an IP address of the SGW-U.
  • a method for managing a service gateway including:
  • the serving gateway (SGW-C) of the control plane receives the creation session request information of the mobility management unit (MME), where the creation session request information carries the location information of the user terminal;
  • MME mobility management unit
  • the SGW-C selects a serving gateway (SGW-U) of the forwarding plane according to the location information of the user terminal, where the SGW-U and the SGW-C are two separated from the serving gateway in the evolved packet system. Network elements.
  • the location information of the user terminal includes at least one of the following: a base station identifier, a cell identifier, and a tracking area identifier (TAI).
  • a base station identifier e.g., a base station identifier
  • a cell identifier e.g., a cell identifier
  • TAI tracking area identifier
  • the selecting, by the SGW-C, the SGW-U according to the location information of the user terminal includes:
  • the SGW-C selects the SGW-U according to the location information, the user type, and the service type of the user terminal; or
  • the SGW-C selects the SGW-U according to the location information of the user terminal, the user type, the service type, and the capacity information weight value of the SGW-U.
  • the method further includes:
  • the SGW-C performs reselection on the SGW-U, where the preset condition includes one of the following: the SGW-C turns off the SGW-U, and the SGW-U The user migrates out, or the SGW-C has a better SGW-U than the SGW-U.
  • the SGW-C queries the DNS to learn the IP address of the reselected destination SGW-U, or selects the destination SGW-U according to the locally stored SGW-U information, where the locally stored SGW-U information It is information pre-configured on the SGW-C, or is information that is learned by the SGW-C during the automatic registration process after the SGW-U is powered on.
  • the method further includes:
  • the SGW-C sends the selected SGW-U identifier of the SGW-U and/or the service area information of the SGW-U to the MME.
  • a management device of a serving gateway, located in a mobility management unit (MME) includes:
  • a first learning module configured to learn, by using a Domain Name System (DNS), a network protocol (IP) address of a serving gateway (SGW-U) of the forwarding plane;
  • DNS Domain Name System
  • IP network protocol
  • a first sending module configured to send the IP address to a serving gateway (SGW-C) of the control plane, where the SGW-U and the SGW-C are two separated by a serving gateway in the evolved packet system Network elements.
  • SGW-C serving gateway
  • the first learning module includes:
  • the first obtaining unit is configured to obtain an IP address list of the SGW-U from the DNS according to current location information of the user terminal, and select an IP address of the SGW-U from the IP address list.
  • the first learning module includes:
  • a second acquiring unit configured to acquire, according to current location information of the user terminal, the IP address list of the SGW-U, the service area of the SGW-U, the service user type of the SGW-U, and the The type of service of the SGW-U;
  • a third obtaining unit configured to select, according to the service area of the SGW-U, the service user type of the SGW-U, and the service type of the SGW-U, from the IP address list of the SGW-U IP address of the SGW-U.
  • the device further includes:
  • the second learning module is configured to obtain, according to current location information of the user terminal, the IP address list of the SGW-C and the capacity weight of the SGW-U from the DNS; according to the capacity weight of the SGW-U
  • the SGW-C is selected from the list of IP addresses of the SGW-C.
  • the first sending module includes:
  • a sending unit configured to send a message to the SGW-C, where the message carries an IP address of the SGW-U.
  • a service gateway management device located at a control plane, including:
  • a receiving module configured to receive the creation session request information of the mobility management unit (MME), where the creation session request information carries location information of the user terminal;
  • MME mobility management unit
  • a selection module configured to select a serving gateway (SGW-U) of the forwarding plane according to the location information of the user terminal; wherein the SGW-U and the SGW-C are two separated by a serving gateway in the evolved packet system Network elements.
  • the location information of the user terminal includes at least one of the following: a base station identifier, a cell identifier, and a tracking area identifier (TAI).
  • a base station identifier e.g., a base station identifier
  • a cell identifier e.g., a cell identifier
  • TAI tracking area identifier
  • the selection module comprises one of the following:
  • the first selecting unit is configured to select the SGW-U according to the location information, the user type, and the service type of the user terminal;
  • the second selecting unit is configured to select the SGW-U according to the location information of the user terminal, the user type, the service type, and the capacity information weight value of the SGW-U.
  • the device further includes:
  • a reselection module configured to: after the selecting module selects the SGW-U according to the location information of the user terminal, reselecting the SGW-U by triggering a preset condition, where the preset condition The SGW-C shuts down the SGW-U to migrate the user of the SGW-U, or the SGW-C has a better SGW than the SGW-U. U;
  • Reselecting the learning module configured to query the DNS to learn the IP address of the reselected destination SGW-U, or to select the destination SGW-U according to the locally stored SGW-U information, wherein the locally stored SGW- U information is information pre-configured on the SGW-C, or is the SGW-C Information learned during the automatic registration process after powering up the SGW-U.
  • the device further includes:
  • a second sending module configured to: after the selecting module selects the SGW-U according to the location information of the user terminal, the SGW-U identifier of the selected SGW-U and/or the service area information of the SGW-U Sent to the MME.
  • the embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, and when the computer executable instructions are executed, implementing the management method of the service gateway on the MME side.
  • the embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, and when the computer executable instructions are executed, implementing the management method of the service gateway on the SGW-C side.
  • the MME obtains the IP address of the SGW-U through the DNS, and sends the IP address to the SGW-C, or the SGW-C receives the creation session request information of the MME, where the creation session request information carries the user terminal.
  • the location information, the SGW-C selects the SGW-U according to the location information of the user terminal, solves the problem that the control plane and the forwarding plane of the service gateway are not perfect, and improves the management of the control plane and the forwarding plane of the service gateway.
  • FIG. 1 is a schematic diagram of a network architecture of a 4G EPS in the related art
  • FIG. 2 is a flowchart 1 of a method for managing a service gateway according to an embodiment of the present invention
  • FIG. 3 is a second flowchart of a method for managing a service gateway according to an embodiment of the present invention
  • FIG. 4 is a structural block diagram 1 of a management apparatus of a service gateway according to an embodiment of the present invention.
  • FIG. 5 is a structural block diagram 2 of a management apparatus of a service gateway according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of separating a control plane and a forwarding plane of an SGW according to an alternative embodiment of the present application
  • FIG. 7 is a flow chart of interaction between an MME selecting a SGW-C and an SGW-U for a user according to an embodiment of the present invention
  • FIG. 8 is an interaction flowchart of an SGW-C selecting a SGW-U for a user according to an embodiment of the present invention
  • FIG. 9 is a flow chart showing an interaction of SGW-C triggering reselection of SGW-U according to an embodiment of the present invention.
  • FIG. 2 is a flowchart 1 of a method for managing a service gateway according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:
  • Step S202 The mobility management unit (MME) obtains a network protocol (IP) address of the serving gateway (SGW-U) of the forwarding plane through a Domain Name System (DNS);
  • IP network protocol
  • SGW-U serving gateway
  • DNS Domain Name System
  • Step S204 the IP address is sent to the serving gateway (SGW-C) of the control plane, where the SGW-U and the SGW-C are two network elements separated from the serving gateway in the evolved packet system;
  • SGW-C serving gateway
  • the MME learns the IP address of the SGW-U through the DNS, and sends the IP address to the SGW-C, which solves the problem that the control plane and the forwarding plane of the service gateway are not perfect, and improves the control plane of the service gateway. And management of forwarding surfaces.
  • the MME learns the IP address of the SGW-U through the DNS, including:
  • the MME obtains an IP address list of the SGW-U from the DNS according to the current location information of the user terminal, and the MME selects an IP address of the SGW-U from the IP address list.
  • the MME learns that the IP address of the SGW-U according to the DNS includes:
  • the MME obtains the IP address list of the SGW-U, the service area of the SGW-U, the service user type of the SGW-U, and the service type of the SGW-U from the DNS according to the current location information of the user terminal, where
  • the service type of the SGW-U can be represented by an Access Point Name (APN);
  • the MME selects an IP address of the SGW-U from the IP address list of the SGW-U according to the service area of the SGW-U, the service user type of the SGW-U, and the service type of the SGW-U.
  • the method further includes: obtaining, by the MME, the IP address list of the SGW-C and the capacity weight of the SGW-U from the DNS according to the current location information of the user terminal; the MME is based on the SGW-U The capacity weight selects the SGW-C from the list of IP addresses of the SGW-C.
  • sending the IP address to the SGW-C includes: the MME sending a create session request or an update session request to the SGW-C, where the create session request or the update session request carries the SGW -U's IP address.
  • FIG. 3 is a second flowchart of a method for managing a service gateway according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
  • Step S302 the serving gateway (SGW-C) of the control plane receives the creation session request information of the mobility management unit (MME), where the creation session request information carries the location information of the user terminal;
  • MME mobility management unit
  • Step S304 the SGW-C selects a serving gateway (SGW-U) of the forwarding plane according to the location information of the user terminal, where the SGW-U and the SGW-C are two separated from the serving gateway in the evolved packet system. Network elements.
  • the SGW-C receives the creation session request information of the MME, where the creation session request information carries the location information of the user terminal, and the SGW-C selects the SGW-U according to the location information of the user terminal, and solves the control of the service gateway.
  • the management of the face and forwarding plane is not perfect, and the management of the control plane and forwarding plane of the service gateway is improved.
  • the location information of the user terminal includes at least one of the following: a base station identifier, a cell identifier, and a Tracking Area Identity (TAI).
  • a base station identifier identifier for the user terminal
  • a cell identifier identifier for the user terminal
  • TAI Tracking Area Identity
  • the SGW-C selects the SGW-U according to the location information of the user terminal, including:
  • the SGW-C selects the SGW-U according to the location information, the user type, and the service type of the user terminal; or
  • the SGW-C selects the SGW-U according to the location information of the user terminal, the user type, the service type, and the capacity information weight value of the SGW-U.
  • the method further includes:
  • the SGW-C performs reselection on the SGW-U, and the preset condition includes one of the following: the SGW-C closes the SGW-U, and the user of the SGW-U is migrated. Going out, or, the SGW-C has a better SGW-U than the SGW-U;
  • the SGW-C queries the DNS to obtain the IP address of the reselected destination SGW-U, or selects the destination SGW-U according to the locally stored SGW-U information, where the locally stored SGW-U information is pre-configured in
  • the information on the SGW-C is, or is, information learned by the SGW-C during the automatic registration process after the SGW-U is powered on.
  • the method further includes: the SGW-C identifies the SGW-U identifier and/or the SGW of the selected SGW-U.
  • the service area information of the -U is sent to the MME.
  • a management device for the service gateway is further provided, and the device is used to implement the foregoing embodiments and optional implementation manners, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 4 is a structural block diagram of a management apparatus of a service gateway according to an embodiment of the present invention. As shown in FIG. 4, the apparatus is located in a mobility management unit (MME), and includes:
  • the first learning module 42 is configured to learn, by using a domain name system (DNS), a network protocol (IP) address of a serving gateway (SGW-U) of the forwarding plane;
  • DNS domain name system
  • IP network protocol
  • the first sending module 44 is connected to the first learning module 42 and configured to send the IP address to the serving gateway (SGW-C) of the control plane, where the SGW-U and the SGW-C are in the evolved packet system.
  • the service gateway separates the two network elements obtained.
  • the first learning module 42 knows the IP address of the SGW-U through the DNS, and the first sending module 44 sends the IP address to the SGW-C, where the SGW-U and the SGW-C are the packet system to be evolved.
  • the two network elements separated by the service gateway solve the problem that the control plane and the forwarding plane of the service gateway are not perfect, and the management of the control plane and the forwarding plane of the service gateway are improved.
  • the first learning module 42 includes:
  • the first obtaining unit is configured to obtain an IP address list of the SGW-U from the DNS according to current location information of the user terminal, and select an IP address of the SGW-U from the IP address list.
  • the first learning module 42 includes:
  • the second obtaining unit is configured to obtain, according to the current location information of the user terminal, the IP address list of the SGW-U, the service area of the SGW-U, the service user type of the SGW-U, and the SGW-U from the DNS. business type;
  • the third obtaining unit is configured to select the IP of the SGW-U from the IP address list of the SGW-U according to the service area of the SGW-U, the service user type of the SGW-U, and the service type of the SGW-U. address.
  • the device further includes: a second learning module, configured to obtain, according to current location information of the user terminal, the IP address list of the SGW-C and the capacity weight of the SGW-U from the DNS; according to the SGW The capacity weight of the -U is selected from the list of IP addresses of the SGW-C.
  • a second learning module configured to obtain, according to current location information of the user terminal, the IP address list of the SGW-C and the capacity weight of the SGW-U from the DNS; according to the SGW The capacity weight of the -U is selected from the list of IP addresses of the SGW-C.
  • the first sending module 44 includes: a sending unit, configured to send a create session request or an update session request to the SGW-C, where the create session request or update the session request carries the IP of the SGW-U address.
  • FIG. 5 is a structural block diagram 2 of a management apparatus of a service gateway according to an embodiment of the present invention. As shown in FIG. 5, the apparatus is located in a serving gateway (SGW-C) of a control plane, and includes:
  • SGW-C serving gateway
  • the receiving module 52 is configured to receive the creation session request information of the mobility management unit (MME), where the creation session request information carries the location information of the user terminal;
  • MME mobility management unit
  • the selecting module 54 is configured to select a serving gateway (SGW-U) of the forwarding plane according to the location information of the user terminal.
  • SGW-U serving gateway
  • the receiving module 52 receives the creation session request information of the MME, where the creation session request information carries the location information of the user terminal, and the selection module 54 selects the SGW-U according to the location information of the user terminal, and solves the control plane of the service gateway.
  • the problem of poor management of the forwarding plane and the management of the control plane and forwarding plane of the service gateway are improved.
  • the location information of the user terminal includes at least one of the following: a base station identifier, a cell identifier, and a tracking area identifier (TAI).
  • the selection module 54 includes one of the following:
  • a first selection unit configured to select the SGW-U according to the location information, the user type, and the service type of the user terminal;
  • the second selecting unit is configured to select the SGW-U according to the location information of the user terminal, the user type, the service type, and the capacity information weight value of the SGW-U.
  • the device further includes:
  • the reselection module is configured to: after the selection module 54 selects the SGW-U according to the location information of the user terminal, reselect the SGW-U by triggering a preset condition, where the preset condition includes the following: One: the SGW-C closes the SGW-U, and the user of the SGW-U is migrated out, or the SGW-C has a SGW-U with better preset performance than the SGW-U;
  • the re-selection learning module is configured to query the DNS to obtain the IP address of the destination SGW-U of the reselection, or to select the destination SGW-U according to the locally stored SGW-U information, wherein the locally stored SGW-U information is The information pre-configured on the SGW-C, or the information learned by the SGW-C during the automatic registration process after the SGW-U is powered on.
  • the apparatus further includes: a second sending module, configured to: after the selecting module 54 selects the SGW-U according to the location information of the user terminal, the selected SGW-U identifier of the SGW-U And/or service area information of the SGW-U is sent to the MME.
  • a second sending module configured to: after the selecting module 54 selects the SGW-U according to the location information of the user terminal, the selected SGW-U identifier of the SGW-U And/or service area information of the SGW-U is sent to the MME.
  • control plane and the forwarding plane of the SGW are separated.
  • 6 is a schematic structural diagram of separating a control plane and a forwarding plane of an SGW according to an optional embodiment of the present application. As shown in FIG. 6, the SGW is divided into a control plane SGW-C and a forwarding plane SGW-U, and interacts through a new interface. .
  • SGW-C The main function of SGW-C is to provide control plane interface with MME and PGW, and control at the same time.
  • SGW-U a SGW-C is generally deployed centrally, and the location of the SGW-U can be flexible.
  • One SGW-C can control one or more SGW-Us.
  • the main function of the SGW-U is to provide user interface with the base station and the PGW, and accept the control of the SGW-C.
  • the control of the SGW-U by the SGW-C mainly includes requesting the SGW-U to allocate or release the GTP-U tunnel resources of the S1-U and S5/S8-U.
  • Each SGW-U has a service area, and the base station in the area can access the SGW-U. When the service area is generally across, the SGW-U reselection occurs.
  • An alternative embodiment of the present application proposes a method of selecting the SGW-U by the MME or the SGW-C.
  • FIG. 7 is a flow chart of an MME selecting an SGW-C and an SGW-U for a user according to an embodiment of the present invention. As shown in FIG. 7, in an attach process, an MME selects a SGW-C and an SGW-U for a user. . The process includes the following steps:
  • step S701 an RRC connection is established between the UE and the base station (eNodeB).
  • Step S702 The UE initiates a registration request to the MME through the established RRC connection, and the registration request carries a user identifier.
  • Step S703 the MME initiates an authentication process to the UE, and through the process, the UE and the MME mutually authenticate.
  • the MME obtains subscription data from the HSS (Home Subscriber Server), including a default APN (Access Point Name).
  • the MME uses the default APN to query the DNS (Domain Name System) to select the corresponding PGW IP address for the user, and then uses the current location information of the user to query the DNS again to obtain the IP address list of the SGW-C and the IP address of the SGW-U.
  • the MME needs to consider information such as user type, location information, and APN.
  • the MME may also select a SGW-U that is combined with the PGW.
  • the service area of the SGW-U is used for subsequent TAI list allocation.
  • Step S705 the MME initiates a create session request message to the SGW-C, where the request message is carried There is a user ID, APN information, and the IP address of the selected SGW-U and the IP address of the PGW.
  • step S706 the SGW-C sends a user plane tunnel resource request message to the SGW-U selected by the MME, and requests to allocate the GTP-U tunnel information (IP address and tunnel identifier) of the S5/S8-U interface and the S1-U interface.
  • the message carries the user ID.
  • Step S707 the SGW-U allocates the GTP-U tunnel information of the S5/S8-U interface and the S1-U interface to the user, and then returns the allocated tunnel information to the SGW-C.
  • Step S708 The SGW-C sends a Create Session Request message to the PGW, where the message carries the S5/S8-U interface GTP-U tunnel information allocated by the SGW-U.
  • Step S709 the PGW saves the GTP-U tunnel information of the S5/S8-U interface of the SGW-U, allocates the GTP-U tunnel information of the S5/S8-U interface of the PGW, allocates an IP address to the user, and then returns an update to the SGW-C. Carry the response.
  • Step S710 The SGW-C initiates a session creation response message to the MME, where the message carries the S1-U interface GTP-U tunnel information allocated by the SGW-U, and the identifier of the SGW-U and the user IP address.
  • step S711 the MME sends an initial user context request message to the base station, where the message carries the S1-U interface GTP-U tunnel information allocated by the SGW-U and the quality of service (QoS) of the corresponding bearer.
  • QoS quality of service
  • Step S712 the base station and the UE establish an air interface dedicated bearer according to the requested QoS.
  • Step S713 the base station allocates the GTP-U tunnel identifier of the S1-U interface, and then returns an initial user context response to the MME.
  • Step S714 the MME initiates an update session request to the SGW-C, where the GTP-U tunnel identifier of the S1-U interface is allocated by the base station.
  • step S715 the SGW-C returns an update session response to the MME.
  • Step S716 the SGW-C sends an update user plane tunnel request to the SGW-U, where the S5/S8-U interface GTP-U tunnel information (that is, the S5/S8 interface IP address of the PGW) that is allocated by the PGW received in step S709 is carried. And the tunnel identifier) and the S1-U interface GTP-U tunnel information allocated by the base station received in step S714.
  • the S5/S8-U interface GTP-U tunnel information that is, the S5/S8 interface IP address of the PGW
  • step S717 the SGW-U saves the information and returns an update user plane tunnel response to the SGW-C.
  • a user plane GTP-U tunnel from the base station to the SGW-U and then to the PGW is established.
  • step S718 the MME allocates a TAI (Tracking Area Identity) list to the user.
  • the TAI list needs to be in the service area of the SGW-U, so that the SGW-U does not change when the user moves in the TAI list.
  • the MME allocates a temporary identifier to the user for subsequent access.
  • the MME initiates a registration response to the UE, and carries the assigned tracking area identifier list, the temporary user identifier, and the user IP address.
  • Step S719 the UE returns a registration completion message to the MME.
  • step S718 can be sent to the user along with steps S711 and S712.
  • the SGW-C may also update the GTP-U tunnel information of the S5/S8-U interface allocated by the PGW and the GTP-U tunnel information of the S1-U interface allocated by the base station by updating the user plane tunnel request, and update the PGW.
  • the information may be after step S709 without waiting for step S716.
  • FIG. 8 is a flow chart of interaction between the SGW-C and the SGW-U for the user according to an embodiment of the present invention. As shown in FIG. 8, in the Attach process, the SGW-C selects an SGW-U for the user. The process includes the following steps:
  • Step S801 an RRC connection is established between the UE and the base station (eNodeB).
  • Step S802 the UE initiates a registration request to the MME through the established RRC connection, and the registration request carries a user identifier.
  • Step S803 the MME initiates an authentication process to the UE, and through the process, the UE and the MME mutually authenticate.
  • Step S804 the MME obtains the subscription data from the HSS, including the default APN, and then selects the PGW IP address corresponding to the default APN and the IP address of the SGW-C for the user through the DNS.
  • Step S805 the MME initiates a create session request message to the SGW-C, where the request message carries a user identifier, a user type, an APN information, and location information of the user (such as a base station identifier or a cell identifier or a TAI).
  • the IP address of the selected PGW is a user identifier, a user type, an APN information, and location information of the user (such as a base station identifier or a cell identifier or a TAI).
  • the SGW-C selects a suitable SGW-U for the user.
  • the SGW-C may learn the list of SGW-Us from the DNS, or may locally configure the list of SGW-Us, or learn the list of SGW-Us according to the SGW-U registration process.
  • SGW-C chooses SGW-U, it needs a comprehensive test.
  • the SGW-U may be configured for different user types, different APNs, and different locations by selecting the appropriate SGW-U for information such as user location information, user type, and requested APN.
  • the SGW-C also needs to perform load balancing between multiple SGW-Us according to the capacity information weight value of the SGW-U.
  • the SGW-C may also select the SGW-U that is combined with the PGW according to the IP address of the PGW.
  • Step S807 the SGW-C sends a user plane tunnel resource request message to the SGW-U, requesting to allocate the GTP-U tunnel information (IP address and tunnel identifier) of the S5/S8-U interface and the S1-U interface, where the message carries There is a user ID.
  • GTP-U tunnel information IP address and tunnel identifier
  • Step S808 the SGW-U allocates the GTP-U tunnel information of the S5/S8-U interface and the S1-U interface to the user, and then returns the allocated tunnel information to the SGW-C.
  • Step S809 the SGW-C sends a Create Session Request message to the PGW, where the message carries the S5/S8-U interface GTP-U tunnel information allocated by the SGW-U.
  • Step S810 the PGW saves the GTP-U tunnel information of the S5/S8-U interface of the SGW-U, allocates the GTP-U tunnel information of the S5/S8-U interface of the PGW, allocates an IP address to the user, and then returns an update to the SGW-C. Carry the response.
  • Step S811 the SGW-C initiates a session creation response message to the MME, where the message carries the S1-U interface GTP-U tunnel information allocated by the SGW-U and the user IP address allocated by the PGW to the user.
  • the message may carry the identity of the SGW-U and/or the service area information of the SGW-U such as a TAI list.
  • Step S812 The MME sends an initial user context request message to the base station, where the message carries the S1-U interface GTP-U tunnel information allocated by the SGW-U and the QoS of the corresponding bearer.
  • Step S813 the base station and the UE establish an air interface dedicated bearer according to the requested QoS.
  • Step S814 the base station allocates the GTP-U tunnel identifier of the S1-U interface, and then returns an initial user context response to the MME.
  • Step S815 the MME initiates an update session request to the SGW-C, where the GTP-U tunnel identifier assigned by the base station to the S1-U interface is carried.
  • step S817 the SGW-C sends an update user plane tunnel request to the SGW-U, where the GTP-U tunnel information of the S5/S8-U interface allocated by the PGW received in step S810 is carried (ie, the PGW The S5/S8 interface IP address and the tunnel identifier) and the S1-U interface GTP-U tunnel information allocated by the base station received in step S815.
  • the GTP-U tunnel information of the S5/S8-U interface allocated by the PGW received in step S810 is carried (ie, the PGW The S5/S8 interface IP address and the tunnel identifier) and the S1-U interface GTP-U tunnel information allocated by the base station received in step S815.
  • step S818 the SGW-U saves the information and returns to the SGW-C to update the user plane tunnel response. After this step, a user plane GTP-U tunnel from the base station to the SGW-U and then to the PGW is established.
  • Step S819 the MME obtains the service area information of the SGW-U according to the service area information of the SGW-U received in step S811, or obtains the service area information of the SGW-U according to the received SGW-U identifier, and allocates a tracking area identifier list to the user, where the user is in the list.
  • the MME can learn the service area information of the SGW-U corresponding to the SGW-U identifier according to the local configuration or the update of the SGW-C.
  • the MME allocates a temporary identifier to the user for subsequent access.
  • the MME initiates a registration response to the UE, where the assigned tracking area identifier list, the temporary user identifier, and the user IP address are carried.
  • Step S820 the UE returns a registration completion message to the MME.
  • step S819 can be sent to the user together with step S812 and step S813.
  • the SGW-C may also update the GTP-U tunnel information of the S5/S8-U interface allocated by the PGW and the GTP-U tunnel information of the S1-U interface allocated by the base station by updating the user plane tunnel request, and update the PGW. The information may be after step S810 without waiting for step S817.
  • FIG. 9 is a flow chart of the SGW-C triggering reselection of the SGW-U according to an embodiment of the present invention. As shown in FIG. 9, in the Attach process, the SGW-C selects an SGW-U1 for the user. The process includes the following steps:
  • the SGW-C triggers the SGW-U reselection.
  • the triggering condition of the reselection may be that the SGW-C decides that the SGW-U1 is closed and needs to migrate the above user, or after the handover, the SGW-C determines that there is a more suitable SGW-U (such as SGW-U2). Service user.
  • the SGW-C can be queried to obtain the SGW-U2 IP address of the destination SGW-U2, and the SGW-U2 can be selected according to the locally stored SGW-U information.
  • the locally stored SGW-U information can be pre-configured on the SGW-C or After the SGW-U is powered on, it is automatically registered in the SGW-C process.
  • Step S902 the SGW-C sends a User Interface Tunnel Resource Request message to the SGW-U2, requesting to allocate the GTP-U tunnel information of the S5/S8-U interface and the S1-U interface.
  • the message carries the user identifier, the S5/S8-U interface GTP-U tunnel information allocated by the PGW (that is, the S5/S8 interface IP address of the PGW and the tunnel identifier), and the S1-U interface GTP-U allocated by the base station (eNodeB). Tunnel letter interest.
  • step S903 the SGW-U2 saves the received tunnel information, and allocates its own S5/S8-U interface and GTP-U tunnel information of the S1-U interface, and then returns the allocated tunnel information to the SGW-C.
  • Step S904 The SGW-C sends an update bearer request message to the PGW, where the message carries the S5/S8-U interface GTP-U tunnel information allocated by the SGW-U2.
  • step S905 the PGW updates the S5/S8-U interface GTP-U tunnel information of the SGW-U2, thereby establishing a S5/S8-U interface bidirectional GTP-U tunnel to the SGW-U2.
  • the PGW returns an update bearer response to the SGW-C, and a timer is set after the SGW-C receives it.
  • Step S906 The SGW-C initiates an update bearer notification request message to the MME, where the message carries the S1-U interface GTP-U tunnel information allocated by the SGW-U2.
  • the message may carry the identity of SGW-U2 and/or service area information of SGW-U2 such as a TAI list.
  • step S907 if the user is currently in the idle state, step S909 is directly performed, and the paging user may be triggered subsequently, and the user enters the connected state after responding. If the user is in the connected state, the MME sends an update bearer notification request to the base station, and carries the S1-U interface GTP-U tunnel information allocated by the SGW-U2.
  • Step S908 the eNodeB updates the S1-U interface GTP-U tunnel information of the SGW-U2, and then establishes a GTP-U bidirectional tunnel from the eNodeB to the SGW-U2.
  • the eNodeB returns an update bearer notification response to the MME.
  • step S909 the MME returns an update bearer notification response to the SGW-C.
  • Step S910 after the timer set in step S905 expires, the SGW-C initiates a request to delete the user plane tunnel resource to the SGW-U1, requesting to delete the S1-U and S5/S8-U tunnels allocated by the original SGW-U1 for the user. Resources.
  • Step S911 after receiving the SGW-U1, delete the S1-U and S5/S8-U tunnel resources allocated for the user, and then return a response to the SGW-C.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course It can be done through hardware, but in many cases the former is a better implementation.
  • the technical solution of the present application which is essential or contributes to the related art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, CD-ROM).
  • the instructions include a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present application.
  • modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are respectively located in multiple processes. In the device.
  • the embodiment of the invention further provides a computer readable storage medium.
  • the above computer readable storage medium may be configured to store program code for performing the method steps of the MME side of the above embodiment.
  • the storage medium is further arranged to store program code for performing the method steps of the SGW-C side of the above-described embodiment.
  • the computer readable storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), and a mobile device.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • the processor performs the method steps of the above embodiments according to the stored program code in the computer readable storage medium.
  • modules or steps of the present application can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed over a network of multiple computing devices. They may be implemented by program code executable by the computing device such that they may be stored in the storage device for execution by the computing device and, in some cases, may be performed in a different order than that illustrated herein. Or the steps described, either separately as a single integrated circuit module, or as a single integrated circuit module. Thus, the application is not limited to any particular combination of hardware and software.
  • the embodiment of the present invention provides a method and a device for managing a service gateway, which solves the problem that the control plane and the forwarding plane of the service gateway are not perfect, and improves the management of the control plane and the forwarding plane of the service gateway.

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Abstract

一种服务网关的管理方法，包括：移动性管理单元MME通过域名系统DNS获知转发面的服务网关SGW-U的网络协议IP地址，并将该IP地址发送给控制面的服务网关SGW-C，或者，控制面的服务网关SGW-C接收移动性管理单元MME的创建会话请求信息，该创建会话请求信息中携带用户终端的位置信息，该SGW-C依据该用户终端的位置信息选择转发面的服务网关SGW-U。上述方案解决了服务网关的控制面和转发面的管理不完善的问题，完善了服务网关的控制面和转发面的管理。

Description

服务网关的管理方法及装置 技术领域
本申请涉及但不限于通信领域，尤其涉及一种服务网关的管理方法及装置。
背景技术
图1是相关技术中第四代移动通信技术(4G)演进的分组系统(Evolved Packet System，简称为EPS)的网络架构的示意图。如图1所示，EPS中的网元功能如下：
终端(UE，User Equipment)通过空口和4G基站接入核心网，并通过演进分组网络(Evolved Packet Core，简称为EPC)接入业务网络。终端可以处于空闲态和连接态，当和基站建立无线资源连接(Radio Resource Connection，简称为RRC)连接时，进入连接态，释放RRC连接时，进入空闲态。
eNodeB是4G基站，为UE提供无线接入，主要功能是进行无线资源控制和调度，并提供基站内的移动性管理。
移动性管理单元(Mobility Management Element，简称为MME)是核心网控制面网元，主要对UE进行鉴权并签约检查。MME同时为用户选择服务网关(Serving Gateway，简称为SGW)和分组域网关(Packet Data Network Gateway，简称为PGW)。当用户处于空闲态时，MME可以根据保存的用户上下文，向基站发起对该用户的寻呼。MME还提供跨基站的移动性管理。
SGW是用户面网元，用户跨基站移动时候的锚点，并在漫游情况提供和PGW的漫游接口。当用户处于空闲态下时，SGW缓存用户数据并触发MME对用户进行寻呼。
PGW是用户面网元，为UE分配网络协议(IP，Internet Protocol)地址，并接入业务网络。当用户移动的时候PGW是IP层锚点，不会发生变化，从而保证业务连续性。
在图1中，S1-MME、S11、S5/S8-C为控制面接口，基于GPRS隧道协议控制面(GPRS Tunneling Protocol-C，简称为GTP-C)，传输信令面数据；S1-U、S5/S8-U为用户面接口，基于GPRS隧道协议用户面(GPRS Tunneling Protocol-U，简称为GTP-U)，传输用户面数据。
随着4G网络的部署，以及智能终端的普及，运营商网络承载的数据流量急速增长，运营商面临着升级网络的压力，对于网关来说，因为控制面和转发面是合一的，因此需要一起升级，成本较大。
针对相关技术中，服务网关的控制面和转发面的管理不完善的问题，目前还没有有效的解决方案。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供了一种服务网关的管理方法及装置，以至少解决相关技术中服务网关的控制面和转发面的管理不完善的问题。
根据本发明实施例的一个方面，提供了一种服务网关的管理方法，包括：
移动性管理单元(MME)通过域名系统(DNS)获知转发面的服务网关(SGW-U)的网络协议(IP)地址，并将所述IP地址发送给控制面的服务网关(SGW-C)，其中，所述SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
可选地，MME通过DNS获知SGW-U的IP地址包括：
所述MME依据用户终端的当前位置信息从所述DNS中获取SGW-U的IP地址列表，所述MME从所述IP地址列表中选择所述SGW-U的IP地址。
可选地，MME根据DNS获知SGW-U的IP地址包括：
所述MME依据用户终端的当前位置信息从所述DNS中获取所述SGW-U的IP地址列表、所述SGW-U的服务区域、所述SGW-U的服务用户类型以及所述SGW-U的业务类型；
所述MME依据所述SGW-U的服务区域、所述SGW-U的服务用户类型 以及所述SGW-U的业务类型，从所述SGW-U的IP地址列表中选择所述SGW-U的IP地址。
可选地，所述方法还包括：
所述MME依据用户终端的当前位置信息从所述DNS中获取所述SGW-C的IP地址列表以及所述SGW-U的容量权重；
所述MME依据所述SGW-U的容量权重从所述SGW-C的IP地址列表中选取所述SGW-C。
可选地，所述将所述IP地址发送给SGW-C包括：所述MME向所述SGW-C发送消息，所述消息中携带SGW-U的IP地址。
根据本发明实施例的另一个方面，还提供了一种服务网关的管理方法，包括：
控制面的服务网关(SGW-C)接收移动性管理单元(MME)的创建会话请求信息，所述创建会话请求信息中携带用户终端的位置信息；
所述SGW-C依据所述用户终端的位置信息选择转发面的服务网关(SGW-U)，其中，所述SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
可选地，所述用户终端的位置信息包括以下至少之一：基站标识、小区标识、以及跟踪区标识(TAI)。
可选地，所述SGW-C依据所述用户终端的位置信息选择SGW-U包括：
所述SGW-C依据所述用户终端的位置信息、用户类型以及业务类型选择所述SGW-U；或者，
所述SGW-C依据所述用户终端的位置信息、用户类型、业务类型以及所述SGW-U的容量信息权重值选择所述SGW-U。
可选地，所述SGW-C依据所述用户终端的位置信息选择SGW-U之后，所述方法还包括：
在预设条件的触发下，所述SGW-C对所述SGW-U进行重选，其中，所述预设条件包括以下之一：所述SGW-C关闭所述SGW-U，将所述SGW-U 的用户迁移出去，或者，所述SGW-C有比所述SGW-U的预设性能好的SGW-U；
所述SGW-C查询DNS获知所述重选的目的SGW-U的IP地址，或者，根据本地存储的SGW-U信息选择所述目的SGW-U，其中，所述本地存储的SGW-U信息是预配置在SGW-C上的信息，或者，是所述SGW-C在SGW-U上电之后的自动注册过程中获知的信息。
可选地，所述SGW-C依据所述用户终端的位置信息选择SGW-U之后，所述方法还包括：
所述SGW-C将所选择的所述SGW-U的SGW-U标识和/或SGW-U的服务区域信息发送给所述MME。
根据本发明实施例的另一个方面，还提供了一种服务网关的管理装置，位于移动性管理单元(MME)，包括：
第一获知模块，设置为通过域名系统(DNS)获知转发面的服务网关(SGW-U)的网络协议(IP)地址；
第一发送模块，设置为将所述IP地址发送给控制面的服务网关(SGW-C)，其中，所述SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
可选地，所述第一获知模块包括：
第一获取单元，设置为依据用户终端的当前位置信息从所述DNS中获取SGW-U的IP地址列表，从所述IP地址列表中选择所述SGW-U的IP地址。
可选地，所述第一获知模块包括：
第二获取单元，设置为依据用户终端的当前位置信息从所述DNS中获取所述SGW-U的IP地址列表、所述SGW-U的服务区域、所述SGW-U的服务用户类型以及所述SGW-U的业务类型；
第三获取单元，设置为依据所述SGW-U的服务区域、所述SGW-U的服务用户类型以及所述SGW-U的业务类型，从所述SGW-U的IP地址列表中选择所述SGW-U的IP地址。
可选地，所述装置还包括：
第二获知模块，设置为依据用户终端的当前位置信息从所述DNS中获取所述SGW-C的IP地址列表以及所述SGW-U的容量权重；依据所述SGW-U的容量权重从所述SGW-C的IP地址列表中选取所述SGW-C。
可选地，所述第一发送模块包括：
发送单元，设置为向所述SGW-C发送消息，其中，所述消息中携带SGW-U的IP地址。
根据本发明实施例的另一个方面，还提供了一种服务网关的管理装置，位于控制面的服务网关(SGW-C)，包括：
接收模块，设置为接收移动性管理单元(MME)的创建会话请求信息，其中，所述创建会话请求信息中携带用户终端的位置信息；
选择模块，设置为依据所述用户终端的位置信息选择转发面的服务网关(SGW-U)；其中，所述SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
可选地，所述用户终端的位置信息包括以下至少之一：基站标识、小区标识、以及跟踪区标识(TAI)。
可选地，所述选择模块包括以下之一：
第一选择单元，设置为依据所述用户终端的位置信息、用户类型以及业务类型选择所述SGW-U；
第二选择单元，设置为依据所述用户终端的位置信息、用户类型、业务类型以及所述SGW-U的容量信息权重值选择所述SGW-U。
可选地，所述装置还包括：
重选模块，设置为在所述选择模块依据所述用户终端的位置信息选择SGW-U之后，在预设条件的触发下，对所述SGW-U进行重选，其中，所述预设条件包括以下之一：所述SGW-C关闭所述SGW-U，将所述SGW-U的用户迁移出去，或者，所述SGW-C有比所述SGW-U的预设性能好的SGW-U；
重选获知模块，设置为查询DNS获知所述重选的目的SGW-U的IP地址，或者，根据本地存储的SGW-U信息选择所述目的SGW-U，其中，所述本地存储的SGW-U信息是预配置在SGW-C上的信息，或者，是所述SGW-C 在SGW-U上电之后的自动注册过程中获知的信息。
可选地，所述装置还包括：
第二发送模块，设置为在所述选择模块依据所述用户终端的位置信息选择SGW-U之后，将所选择的所述SGW-U的SGW-U标识和/或SGW-U的服务区域信息发送给所述MME。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现MME侧的上述服务网关的管理方法。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现SGW-C侧的上述服务网关的管理方法。
通过本发明实施例，MME通过DNS获知SGW-U的IP地址，并将该IP地址发送给SGW-C，或者，SGW-C接收MME的创建会话请求信息，该创建会话请求信息中携带用户终端的位置信息，该SGW-C依据该用户终端的位置信息选择SGW-U，解决了服务网关的控制面和转发面的管理不完善的问题，完善了服务网关的控制面和转发面的管理。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是相关技术中4G EPS的网络架构的示意图；
图2是根据本发明实施例的一种服务网关的管理方法的流程图一；
图3是根据本发明实施例的一种服务网关的管理方法的流程图二；
图4是根据本发明实施例的一种服务网关的管理装置的结构框图一；
图5是根据本发明实施例的一种服务网关的管理装置的结构框图二；
图6是根据本申请可选实施例的SGW的控制面和转发面分离的架构示意图；
图7是根据本发明实施例的MME为用户选择SGW-C和SGW-U的交互流程图；
图8是根据本发明实施例的SGW-C为用户选择SGW-U的交互流程图；
图9是根据本发明实施例的SGW-C触发重新选择SGW-U的交互流程图。
本发明的实施方式
下文中将参考附图并结合实施例来详细说明本申请。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
在本实施例中提供了一种服务网关的管理方法，图2是根据本发明实施例的一种服务网关的管理方法的流程图一，如图2所示，该方法包括如下步骤：
步骤S202，移动性管理单元(MME)通过域名系统(DNS，Domain Name System)获知转发面的服务网关(SGW-U)的网络协议(IP)地址；
步骤S204，将该IP地址发送给控制面的服务网关(SGW-C)，其中，该SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元；
通过上述步骤，MME通过DNS获知SGW-U的IP地址，并将该IP地址发送给SGW-C，解决了服务网关的控制面和转发面的管理不完善的问题，完善了服务网关的控制面和转发面的管理。
在本实施例中，MME通过DNS获知SGW-U的IP地址包括：
该MME依据用户终端的当前位置信息从该DNS中获取SGW-U的IP地址列表，该MME从该IP地址列表中选择该SGW-U的IP地址。
在本实施例中，MME根据DNS获知SGW-U的IP地址包括：
该MME依据用户终端的当前位置信息从该DNS中获取该SGW-U的IP地址列表、该SGW-U的服务区域、该SGW-U的服务用户类型以及该SGW-U的业务类型，其中，SGW-U的业务类型可以用接入点名称(APN，Access Point Name)表示；
该MME依据该SGW-U的服务区域、该SGW-U的服务用户类型以及该SGW-U的业务类型，从该SGW-U的IP地址列表中选择该SGW-U的IP地址。
在本实施例中，上述方法还包括：该MME依据用户终端的当前位置信息从该DNS中获取该SGW-C的IP地址列表以及该SGW-U的容量权重；该MME依据该SGW-U的容量权重从该SGW-C的IP地址列表中选取该SGW-C。
在本实施例中，步骤S204中，将该IP地址发送给SGW-C包括：该MME向该SGW-C发送创建会话请求或者更新会话请求，其中，该创建会话请求或者更新会话请求中携带SGW-U的IP地址。
在本实施例中还提供了一种服务网关的管理方法，图3是根据本发明实施例的一种服务网关的管理方法的流程图二，如图3所示，该方法包括如下步骤：
步骤S302，控制面的服务网关(SGW-C)接收移动性管理单元(MME)的创建会话请求信息，该创建会话请求信息中携带用户终端的位置信息；
步骤S304，该SGW-C依据该用户终端的位置信息选择转发面的服务网关(SGW-U)，其中，该SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
通过上述步骤，SGW-C接收MME的创建会话请求信息，该创建会话请求信息中携带用户终端的位置信息，该SGW-C依据该用户终端的位置信息选择SGW-U，解决了服务网关的控制面和转发面的管理不完善的问题，完善了服务网关的控制面和转发面的管理。
在本实施例中，该用户终端的位置信息包括以下至少之一：基站标识、小区标识、以及跟踪区标识(TAI，Tracking Area Identity)。
在本实施例中，该SGW-C依据该用户终端的位置信息选择SGW-U包括：
该SGW-C依据该用户终端的位置信息、用户类型以及业务类型选择该SGW-U；或者，
该SGW-C依据该用户终端的位置信息、用户类型、业务类型以及该SGW-U的容量信息权重值选择该SGW-U。
在本实施例中，SGW-C依据该用户终端的位置信息选择SGW-U之后，该方法还包括：
在预设条件的触发下，该SGW-C对该SGW-U进行重选，其中，该预设条件包括以下之一：该SGW-C关闭该SGW-U，将该SGW-U的用户迁移出去，或者，该SGW-C有比该SGW-U的预设性能好的SGW-U；
该SGW-C查询DNS获知该重选的目的SGW-U的IP地址，或者，根据本地存储的SGW-U信息选择该目的SGW-U，其中，该本地存储的SGW-U信息是预配置在SGW-C上的信息，或者，是该SGW-C在SGW-U上电之后的自动注册过程中获知的信息。
在本实施例中，该SGW-C依据该用户终端的位置信息选择SGW-U之后，所述方法还包括：该SGW-C将所选择的该SGW-U的SGW-U标识和/或SGW-U的服务区域信息发送给该MME。
在本实施例中还提供了一种服务网关的管理装置，该装置用于实现上述实施例及可选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图4是根据本发明实施例的一种服务网关的管理装置的结构框图一，如图4所示，该装置位于移动性管理单元(MME)，包括：
第一获知模块42，设置为通过域名系统(DNS)获知转发面的服务网关(SGW-U)的网络协议(IP)地址；
第一发送模块44与该第一获知模块42连接，设置为将该IP地址发送给控制面的服务网关(SGW-C)，其中，该SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
通过上述装置，第一获知模块42通过DNS获知SGW-U的IP地址，第一发送模块44将该IP地址发送给SGW-C，其中，该SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元，解决了服务网关的控制面和转发面的管理不完善的问题，完善了服务网关的控制面和转发面的管理。
在本实施例中，该第一获知模块42包括：
第一获取单元，设置为依据用户终端的当前位置信息从该DNS中获取SGW-U的IP地址列表，从该IP地址列表中选择该SGW-U的IP地址。
在本实施例中，该第一获知模块42包括：
第二获取单元，设置为依据用户终端的当前位置信息从该DNS中获取该SGW-U的IP地址列表、该SGW-U的服务区域、该SGW-U的服务用户类型以及该SGW-U的业务类型；
第三获取单元，设置为依据该SGW-U的服务区域、该SGW-U的服务用户类型以及该SGW-U的业务类型，从该SGW-U的IP地址列表中选择该SGW-U的IP地址。
在本实施例中，该装置还包括：第二获知模块，设置为依据用户终端的当前位置信息从该DNS中获取该SGW-C的IP地址列表以及该SGW-U的容量权重；依据该SGW-U的容量权重从该SGW-C的IP地址列表中选取该SGW-C。
在本实施例中，该第一发送模块44包括：发送单元，设置为向该SGW-C发送创建会话请求或者更新会话请求，其中，该创建会话请求或者更新会话请求中携带SGW-U的IP地址。
图5是根据本发明实施例的一种服务网关的管理装置的结构框图二，如图5所示，该装置位于控制面的服务网关(SGW-C)中，包括：
接收模块52，设置为接收移动性管理单元(MME)的创建会话请求信息，其中，该创建会话请求信息中携带用户终端的位置信息；
选择模块54，设置为依据该用户终端的位置信息选择转发面的服务网关(SGW-U)。
通过上述装置，接收模块52接收MME的创建会话请求信息，该创建会话请求信息中携带用户终端的位置信息，选择模块54依据该用户终端的位置信息选择SGW-U，解决了服务网关的控制面和转发面的管理不完善的问题，完善了服务网关的控制面和转发面的管理。
在本实施例中，该用户终端的位置信息包括以下至少之一：基站标识、小区标识、以及跟踪区标识(TAI)。
在本实施例中，该选择模块54包括以下之一：
第一选择单元，设置为依据该用户终端的位置信息、用户类型以及业务类型选择该SGW-U；
第二选择单元，设置为依据该用户终端的位置信息、用户类型、业务类型以及该SGW-U的容量信息权重值选择该SGW-U。
在本实施例中，该装置还包括：
重选模块，设置为在所述选择模块54依据该用户终端的位置信息选择SGW-U之后，在预设条件的触发下，对该SGW-U进行重选，其中，该预设条件包括以下之一：该SGW-C关闭该SGW-U，将该SGW-U的用户迁移出去，或者，该SGW-C有比该SGW-U的预设性能好的SGW-U；
重选获知模块，设置为查询DNS获知该重选的目的SGW-U的IP地址，或者，根据本地存储的SGW-U信息选择该目的SGW-U，其中，该本地存储的SGW-U信息是预配置在SGW-C上的信息，或者，是该SGW-C在SGW-U上电之后的自动注册过程中获知的信息。
在本实施例中，该装置还包括：第二发送模块，设置为在所述选择模块54依据该用户终端的位置信息选择SGW-U之后，将所选择的该SGW-U的SGW-U标识和/或SGW-U的服务区域信息发送给该MME。
下面结合可选实施例对本申请进行详细说明。
在本申请的可选实施例中，SGW的控制面和转发面分离。图6是根据本申请可选实施例的SGW的控制面和转发面分离的架构示意图，如图6所示，SGW分为控制面SGW-C和转发面SGW-U，中间通过一个新接口交互。
SGW-C的主要功能是提供和MME以及PGW的控制面接口，同时控制 SGW-U，一个SGW-C一般集中式部署，而SGW-U的位置可以比较灵活。一个SGW-C可以控制一个或者多个SGW-U。
SGW-U的主要功能是提供和基站以及PGW的用户面接口，并接受SGW-C的控制。SGW-C对SGW-U的控制主要包括请求SGW-U分配或者释放S1-U、S5/S8-U的GTP-U隧道资源。每个SGW-U都有一个服务区域，在该区域内的基站能够接入该SGW-U，一般跨服务区域的时候，会发生SGW-U重选。
SGW-U和SGW-C分离之后，一个需要解决的问题是SGW-U的选择，本申请的可选实施例提出了一种由MME或者SGW-C选择SGW-U的方法。
图7是根据本发明实施例的MME为用户选择SGW-C和SGW-U的交互流程图，如图7所示，在附着(Attach)过程中，MME为用户选择SGW-C和SGW-U。该流程包括以下步骤：
步骤S701，UE和基站(eNodeB)之间建立RRC连接。
步骤S702，UE通过所建立的RRC连接，通过该基站向MME发起注册请求，该注册请求中带有用户标识。
步骤S703，MME向UE发起鉴权过程，通过该过程，UE和MME相互鉴权。
步骤S704，MME从HSS(Home Subscriber Server，归属用户服务器)获得签约数据，其中包括缺省APN(Access Point Name，接入点名字)。MME利用缺省APN查询DNS(Domain Name System，域名系统)，为用户选择对应的PGW IP地址，然后再次利用用户当前位置信息查询DNS，获得SGW-C的IP地址列表、SGW-U的IP地址列表、SGW-U的服务区域、SGW-U的服务用户类型以及SGW-U的容量权重，MME从中选择一个合适的SGW-C和SGW-U。MME在选择SGW-U的时候，需要考虑用户类型、位置信息、APN等信息。选择SGW-C时还需要考虑SGW-U对应的容量权重，以实现SGW-U之间的负荷均衡。MME也可能选择一个和PGW合设的SGW-U。SGW-U的服务区域用于后续TAI列表分配。
步骤S705，MME向SGW-C发起创建会话请求消息，该请求消息中带 有用户标识、APN信息，还带有选择的SGW-U的IP地址和PGW的IP地址。
步骤S706，SGW-C向MME所选择的SGW-U发送分配用户面隧道资源请求消息，请求分配S5/S8-U接口和S1-U接口的GTP-U隧道信息(IP地址和隧道标识)，该消息中携带有用户标识。
步骤S707，SGW-U为用户分配S5/S8-U接口和S1-U接口的GTP-U隧道信息，然后向SGW-C返回所分配的隧道信息。
步骤S708，SGW-C向PGW发送创建会话请求消息，该消息中携带有SGW-U分配的S5/S8-U接口GTP-U隧道信息。
步骤S709，PGW保存SGW-U的S5/S8-U接口GTP-U隧道信息，并分配PGW的S5/S8-U接口GTP-U隧道信息，为用户分配IP地址，然后向SGW-C返回更新承载响应。
步骤S710，SGW-C向MME发起创建会话响应消息，该消息中携带有SGW-U分配的S1-U接口GTP-U隧道信息，以及SGW-U的标识和用户IP地址。
步骤S711，MME向基站发送创建初始用户上下文请求消息，该消息中携带有SGW-U分配的S1-U接口GTP-U隧道信息以及对应承载的服务质量(QoS，Quality of Service)。
步骤S712，基站和UE之间根据请求的QoS建立空口专用承载。
步骤S713，基站分配S1-U接口的GTP-U隧道标识，然后向MME返回创建初始用户上下文响应。
步骤S714，MME向SGW-C发起更新会话请求，其中携带有基站分配S1-U接口的GTP-U隧道标识。
步骤S715，SGW-C向MME返回更新会话响应。
步骤S716，SGW-C向SGW-U发送更新用户面隧道请求，其中携带有步骤S709中收到的PGW分配的S5/S8-U接口GTP-U隧道信息(即PGW的S5/S8接口IP地址以及隧道标识)以及步骤S714中收到的基站分配的S1-U接口GTP-U隧道信息。
步骤S717，SGW-U保存该信息，并向SGW-C返回更新用户面隧道响应。该步骤之后，建立了基站到SGW-U然后到PGW的用户面GTP-U隧道。
步骤S718，MME为用户分配TAI(Tracking Area Identity，跟踪区标识)列表，该TAI列表需要在SGW-U的服务区域内，使得用户在该TAI列表中移动的时候，SGW-U不会发生变化。MME为用户分配临时标识，用于后续接入。MME向UE发起注册响应，携带有所分配的跟踪区标识列表、临时用户标识和用户IP地址。
步骤S719，UE向MME返回注册完成消息。
在该实施例中，步骤S718可以和步骤S711和步骤S712一起发送给用户。对于步骤S716，SGW-C也可以通过两个更新用户面隧道请求，分别更新PGW分配的S5/S8-U接口GTP-U隧道信息和基站分配的S1-U接口GTP-U隧道信息，更新PGW的信息可以在步骤S709之后而无需等到步骤S716。
图8是根据本发明实施例的SGW-C为用户选择SGW-U的交互流程图，如图8所示，在Attach过程，SGW-C为用户选择一个SGW-U。该流程包括以下步骤：
步骤S801，UE和基站(eNodeB)之间建立RRC连接。
步骤S802，UE通过所建立的RRC连接，通过该基站向MME发起注册请求，该注册请求中带有用户标识。
步骤S803，MME向UE发起鉴权过程，通过该过程，UE和MME相互鉴权。
步骤S804，MME从HSS获得签约数据，其中包括缺省APN，然后通过DNS为用户选择缺省APN对应的PGW IP地址以及SGW-C的IP地址。
步骤S805，MME向SGW-C发起创建会话请求消息，该请求消息中带有用户标识、用户类型、APN信息以及用户的位置信息(比如基站标识或者小区标识或者TAI)，该消息还带有所选择的PGW的IP地址。
步骤S806，SGW-C为用户选择一个合适的SGW-U。SGW-C可能从DNS获知SGW-U的列表，也可能本地配置SGW-U的列表，或者根据SGW-U注册过程来获知SGW-U的列表。SGW-C在选择SGW-U的时候，需要综合考 虑用户位置信息、用户类型、请求的APN等信息选择合适的SGW-U，运营商可能会为不同用户类型、不同APN、不同的位置配置使用不同的SGW-U。SGW-C还需要根据该SGW-U的容量信息权重值，以实现多个SGW-U之间的负荷均衡。SGW-C还可能根据PGW的IP地址，选择和PGW合设的SGW-U。
步骤S807，SGW-C向SGW-U发送分配用户面隧道资源请求消息，请求分配S5/S8-U接口和S1-U接口的GTP-U隧道信息(IP地址和隧道标识)，该消息中携带有用户标识。
步骤S808，SGW-U为用户分配S5/S8-U接口和S1-U接口的GTP-U隧道信息，然后向SGW-C返回所分配的隧道信息。
步骤S809，SGW-C向PGW发送创建会话请求消息，该消息中携带有SGW-U分配的S5/S8-U接口GTP-U隧道信息。
步骤S810，PGW保存SGW-U的S5/S8-U接口GTP-U隧道信息，并分配PGW的S5/S8-U接口GTP-U隧道信息，为用户分配IP地址，然后向SGW-C返回更新承载响应。
步骤S811，SGW-C向MME发起创建会话响应消息，该消息中携带有SGW-U分配的S1-U接口GTP-U隧道信息和PGW为该用户分配的用户IP地址。可选地，该消息可能带有SGW-U的标识和/或SGW-U的服务区域信息比如TAI列表。
步骤S812，MME向基站发送创建初始用户上下文请求消息，该消息中携带有SGW-U分配的S1-U接口GTP-U隧道信息以及对应承载的QoS。
步骤S813，基站和UE之间根据请求的QoS建立空口专用承载。
步骤S814，基站分配S1-U接口的GTP-U隧道标识，然后向MME返回创建初始用户上下文响应。
步骤S815，MME向SGW-C发起更新会话请求，其中携带有基站分配S1-U接口的GTP-U隧道标识。
步骤S816，SGW-C向MME返回更新会话响应。
步骤S817，SGW-C向SGW-U发送更新用户面隧道请求，其中携带有步骤S810收到的PGW分配的S5/S8-U接口GTP-U隧道信息(即PGW的 S5/S8接口IP地址以及隧道标识)以及步骤S815收到的基站分配的S1-U接口GTP-U隧道信息。
步骤S818，SGW-U保存该信息，并返回SGW-C更新用户面隧道响应。该步骤之后，建立了基站到SGW-U然后到PGW的用户面GTP-U隧道。
步骤S819，MME根据步骤S811收到的该SGW-U的服务区域信息，或者根据收到的SGW-U标识获得该SGW-U的服务区域信息，为用户分配跟踪区标识列表，用户在该列表中移动的时候，无需发生SGW-U变化。MME可以根据本地配置，或者SGW-C的更新，获知SGW-U标识对应的SGW-U的服务区信息。MME为用户分配临时标识，用于后续接入。MME向UE发起注册响应，其中携带有所分配的跟踪区标识列表、临时用户标识和用户IP地址。
步骤S820，UE向MME返回注册完成消息。
该实施例中，步骤S819可以和步骤S812和步骤S813一起发送给用户。对于步骤S817，SGW-C也可以通过两个更新用户面隧道请求，分别更新PGW分配的S5/S8-U接口GTP-U隧道信息和基站分配的S1-U接口GTP-U隧道信息，更新PGW的信息可以在步骤S810之后而无需等到步骤S817。
图9是根据本发明实施例的SGW-C触发重新选择SGW-U的交互流程图，如图9所示，在Attach过程，SGW-C为用户选择一个SGW-U1。该流程包括以下步骤：
步骤S901，SGW-C触发SGW-U重选。重选的触发条件，可能是SGW-C决定SGW-U1关闭从而需要将上面的用户迁移出去，也可能是在切换之后，SGW-C判断当前有更合适的SGW-U(如SGW-U2)服务用户。SGW-C可以查询DNS获知目的SGW-U2的IP地址，也可以根据本地存储的SGW-U信息选择SGW-U2，本地存储的SGW-U信息可以是预配置在SGW-C上，也可以是SGW-U上电之后，自动注册到SGW-C过程中获知的。
步骤S902，SGW-C向SGW-U2发送分配用户面隧道资源请求消息，请求分配S5/S8-U接口和S1-U接口的GTP-U隧道信息。该消息中携带有用户标识、PGW分配的S5/S8-U接口GTP-U隧道信息(即PGW的S5/S8接口IP地址以及隧道标识)以及基站(eNodeB)分配的S1-U接口GTP-U隧道信 息。
步骤S903，SGW-U2保存收到的隧道信息，并分配自己的S5/S8-U接口和S1-U接口的GTP-U隧道信息，然后向SGW-C返回所分配的隧道信息。
步骤S904，SGW-C向PGW发送更新承载请求消息，该消息中携带有SGW-U2分配的S5/S8-U接口GTP-U隧道信息。
步骤S905，PGW更新SGW-U2的S5/S8-U接口GTP-U隧道信息，从而建立了到SGW-U2的S5/S8-U接口双向GTP-U隧道。PGW向SGW-C返回更新承载响应，SGW-C收到之后设置一个定时器。
步骤S906，SGW-C向MME发起更新承载通知请求消息，该消息中携带有SGW-U2分配的S1-U接口GTP-U隧道信息。可选地，该消息可能带有SGW-U2的标识和/或SGW-U2的服务区域信息比如TAI列表。
步骤S907，如果用户当前处于空闲状态，则直接执行步骤S909，后续可能触发寻呼用户，用户响应之后进入连接态。如果用户处于连接态，则MME向基站发送更新承载通知请求，携带有SGW-U2分配的S1-U接口GTP-U隧道信息。
步骤S908，eNodeB更新SGW-U2的S1-U接口GTP-U隧道信息，于是建立了eNodeB到SGW-U2的GTP-U双向隧道。eNodeB向MME返回更新承载通知响应。
步骤S909，MME向SGW-C返回更新承载通知响应。
通过上述步骤，建立了eNodeB到SGW-U2、SGW-U2到PGW的GTP-U双向隧道。
步骤S910，当步骤S905中设置的定时器超时之后，SGW-C向SGW-U1发起删除用户面隧道资源请求，请求删除原来SGW-U1为该用户分配的S1-U和S5/S8-U隧道资源。
步骤S911，SGW-U1收到之后，删除该为用户分配的S1-U和S5/S8-U隧道资源，然后向SGW-C返回响应。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也 可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对相关技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本申请各个实施例所述的方法。
需要说明的是，上述模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述模块分别位于多个处理器中。
本发明实施例还提供了一种计算机可读存储介质。可选地，在本实施例中，上述计算机可读存储介质可以被设置为存储用于执行上述实施例的MME侧的方法步骤的程序代码。
可选地，存储介质还被设置为存储用于执行上述实施例的SGW-C侧的方法步骤的程序代码。
可选地，在本实施例中，上述计算机可读存储介质可以包括但不限于：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
可选地，在本实施例中，处理器根据计算机可读存储介质中已存储的程序代码执行上述实施例的方法步骤。
本领域的技术人员应该明白，上述的本申请的模块或步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成单个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本申请不限制于任何特定的硬件和软件结合。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护 范围之内。
工业实用性
本申请实施例提供一种服务网关的管理方法及装置，解决了服务网关的控制面和转发面的管理不完善的问题，完善了服务网关的控制面和转发面的管理。

Claims (20)

  1. 一种服务网关的管理方法，包括：
    移动性管理单元MME通过域名系统DNS获知转发面的服务网关SGW-U的网络协议IP地址，并将所述IP地址发送给控制面的服务网关SGW-C，其中，所述SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
  2. 根据权利要求1所述的方法，其中，所述MME通过DNS获知SGW-U的IP地址包括：
    所述MME依据用户终端的当前位置信息从所述DNS中获取SGW-U的IP地址列表，所述MME从所述IP地址列表中选择所述SGW-U的IP地址。
  3. 根据权利要求1所述的方法，其中，所述MME根据DNS获知SGW-U的IP地址包括：
    所述MME依据用户终端的当前位置信息从所述DNS中获取所述SGW-U的IP地址列表、所述SGW-U的服务区域、所述SGW-U的服务用户类型以及所述SGW-U的业务类型；
    所述MME依据所述SGW-U的服务区域、所述SGW-U的服务用户类型以及所述SGW-U的业务类型，从所述SGW-U的IP地址列表中选择所述SGW-U的IP地址。
  4. 根据权利要求1所述的方法，所述方法还包括：
    所述MME依据用户终端的当前位置信息从所述DNS中获取所述SGW-C的IP地址列表以及所述SGW-U的容量权重；
    所述MME依据所述SGW-U的容量权重从所述SGW-C的IP地址列表中选取所述SGW-C。
  5. 根据权利要求1至4中任一项所述的方法，其中，所述将所述IP地址发送给SGW-C包括：
    所述MME向所述SGW-C发送消息，所述消息中携带SGW-U的IP地址。
  6. 一种服务网关的管理方法，包括：
    控制面的服务网关SGW-C接收移动性管理单元MME的创建会话请求信息，所述创建会话请求信息中携带用户终端的位置信息；
    所述SGW-C依据所述用户终端的位置信息选择转发面的服务网关SGW-U，其中，所述SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
  7. 根据权利要求6所述的方法，其中，所述用户终端的位置信息包括以下至少之一：基站标识、小区标识、以及跟踪区标识TAI。
  8. 根据权利要求6所述的方法，其中，所述SGW-C依据所述用户终端的位置信息选择SGW-U包括：
    所述SGW-C依据所述用户终端的位置信息、用户类型以及业务类型选择所述SGW-U；或者，
    所述SGW-C依据所述用户终端的位置信息、用户类型、业务类型以及所述SGW-U的容量信息权重值选择所述SGW-U。
  9. 根据权利要求6所述的方法，所述SGW-C依据所述用户终端的位置信息选择SGW-U之后，所述方法还包括：
    在预设条件的触发下，所述SGW-C对所述SGW-U进行重选，其中，所述预设条件包括以下之一：所述SGW-C关闭所述SGW-U，将所述SGW-U的用户迁移出去，或者，所述SGW-C有比所述SGW-U的预设性能好的SGW-U；
    所述SGW-C查询域名系统DNS获知所述重选的目的SGW-U的网络协议IP地址，或者，根据本地存储的SGW-U信息选择所述目的SGW-U，其中，所述本地存储的SGW-U信息是预配置在SGW-C上的信息，或者，是所述SGW-C在SGW-U上电之后的自动注册过程中获知的信息。
  10. 根据权利要求6至9任一项所述的方法，所述SGW-C依据所述用户终端的位置信息选择SGW-U之后，所述方法还包括：
    所述SGW-C将所选择的所述SGW-U的SGW-U标识和/或SGW-U的服务区域信息发送给所述MME。
  11. 一种服务网关的管理装置，位于移动性管理单元MME，包括：
    第一获知模块，设置为通过域名系统DNS获知转发面的服务网关SGW-U的网络协议IP地址；
    第一发送模块，设置为将所述IP地址发送给控制面的服务网关SGW-C，其中，所述SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
  12. 根据权利要求11所述的装置，其中，所述第一获知模块包括：
    第一获取单元，设置为依据用户终端的当前位置信息从所述DNS中获取SGW-U的IP地址列表，从所述IP地址列表中选择所述SGW-U的IP地址。
  13. 根据权利要求11所述的装置，其中，所述第一获知模块包括：
    第二获取单元，设置为依据用户终端的当前位置信息从所述DNS中获取所述SGW-U的IP地址列表、所述SGW-U的服务区域、所述SGW-U的服务用户类型以及所述SGW-U的业务类型；
    第三获取单元，设置为依据所述SGW-U的服务区域、所述SGW-U的服务用户类型以及所述SGW-U的业务类型，从所述SGW-U的IP地址列表中选择所述SGW-U的IP地址。
  14. 根据权利要求11所述的装置，所述装置还包括：
    第二获知模块，设置为依据用户终端的当前位置信息从所述DNS中获取所述SGW-C的IP地址列表以及所述SGW-U的容量权重；依据所述SGW-U的容量权重从所述SGW-C的IP地址列表中选取所述SGW-C。
  15. 根据权利要求11所述的装置，其中，所述第一发送模块包括：
    发送单元，设置为向所述SGW-C发送消息，其中，所述消息中携带SGW-U的IP地址。
  16. 一种服务网关的管理装置，位于控制面的服务网关SGW-C中，包括：
    接收模块，设置为接收移动性管理单元MME的创建会话请求信息，其 中，所述创建会话请求信息中携带用户终端的位置信息；
    选择模块，设置为依据所述用户终端的位置信息选择转发面的服务网关SGW-U；其中，所述SGW-U和SGW-C为将演进的分组系统中的服务网关分离得到的两个网元。
  17. 根据权利要求16所述的装置，其中，所述用户终端的位置信息包括以下至少之一：基站标识、小区标识、以及跟踪区标识TAI。
  18. 根据权利要求16所述的装置，其中，所述选择模块包括以下之一：
    第一选择单元，设置为依据所述用户终端的位置信息、用户类型以及业务类型选择所述SGW-U；
    第二选择单元，设置为依据所述用户终端的位置信息、用户类型、业务类型以及所述SGW-U的容量信息权重值选择所述SGW-U。
  19. 根据权利要求16所述的装置，所述装置还包括：
    重选模块，设置为在所述选择模块依据所述用户终端的位置信息选择SGW-U之后，在预设条件的触发下，对所述SGW-U进行重选，其中，所述预设条件包括以下之一：所述SGW-C关闭所述SGW-U，将所述SGW-U的用户迁移出去，或者，所述SGW-C有比所述SGW-U的预设性能好的SGW-U；
    重选获知模块，设置为查询域名系统DNS获知所述重选的目的SGW-U的网络协议IP地址，或者，根据本地存储的SGW-U信息选择所述目的SGW-U，其中，所述本地存储的SGW-U信息是预配置在SGW-C上的信息，或者，是所述SGW-C在SGW-U上电之后的自动注册过程中获知的信息。
  20. 根据权利要求16所述的装置，所述装置还包括：
    第二发送模块，设置为在所述选择模块依据所述用户终端的位置信息选择SGW-U之后，将所选择的所述SGW-U的SGW-U标识和/或SGW-U的服务区域信息发送给所述MME。
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