WO2013185311A1 - 获取服务网关的方法及移动管理节点、数据网关及系统 - Google Patents

获取服务网关的方法及移动管理节点、数据网关及系统 Download PDF

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Publication number
WO2013185311A1
WO2013185311A1 PCT/CN2012/076871 CN2012076871W WO2013185311A1 WO 2013185311 A1 WO2013185311 A1 WO 2013185311A1 CN 2012076871 W CN2012076871 W CN 2012076871W WO 2013185311 A1 WO2013185311 A1 WO 2013185311A1
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Prior art keywords
management node
new
data gateway
gateway
domain name
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PCT/CN2012/076871
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English (en)
French (fr)
Inventor
陈靖
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201280001171.5A priority Critical patent/CN102893638B/zh
Priority to PCT/CN2012/076871 priority patent/WO2013185311A1/zh
Priority to EP12878657.1A priority patent/EP2849465A4/en
Priority to JP2015516401A priority patent/JP5947982B2/ja
Publication of WO2013185311A1 publication Critical patent/WO2013185311A1/zh
Priority to US14/562,548 priority patent/US9848359B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/30—Types of network names
    • H04L2101/35—Types of network names containing special prefixes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/30—Types of network names
    • H04L2101/375—Access point names [APN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/69—Types of network addresses using geographic information, e.g. room number
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server
    • H04W8/065—Registration at serving network Location Register, VLR or user mobility server involving selection of the user mobility server

Definitions

  • the invention belongs to the field of mobile communications, and particularly relates to acquiring a service gateway (Serving) Gateway, S-GW) method, mobility management node, data gateway and system.
  • a service gateway Serving Gateway
  • S-GW Service Gateway
  • the service GPRS support node connected to the S-GW through the S4 interface (Serving GPRS Support) Node, SGSN) or Mobility Management Entity (MME) is called S4 SGSN/MME.
  • Packet Data Networks Gateway Packet Data Networks Gateway, P-GW
  • P-GW Packet Data Networks Gateway
  • the S-GW may change as the UE moves.
  • UE from general packet radio service (General Packet Radio Service, GPRS) / Universal Mobile Telecommunications (Universal Mobile Telecommunications) System, UMTS) Gateway GPRS support node (Gateway GPRS Support) during network mobility to EPS network Node, GGSN) and P-GW as anchor points of user data in GPRS/UMTS network and EPS network, will not change, and UE does not use S-GW in GPRS/UMTS network, after moving to EPS network Use the service gateway (Serving Gateway, S-GW).
  • the new side mobility management node S4 After selecting a new-side S-GW for the UE, the SGSN/MME may increase the transmission delay of the user service data.
  • An embodiment of the present invention provides a method for acquiring a serving gateway, a mobility management node, a data gateway, and a system, which are used to reduce a user service data transmission delay that is added after the new-side mobility management node selects a new-side S-GW for the UE.
  • a method for acquiring a serving gateway S-GW when the user equipment UE is handed over from the old mobile management node to the new mobile management node, includes: the new mobile management node The access information of the UE is sent to the domain name system DNS server, where the access information includes the access point name APN of the UE or the old side location area identifier of the UE; the new side mobility management Receiving, by the node, a host name of the device returned by the DNS server according to the domain name resolution request; the new-side mobility management node acquiring a host name of a new-side available S-GW; and the new-side mobility management node according to the host of the device
  • the part of the name indicating the geographical topological relationship and the part of the host name of the S-GW that can be used to represent the geographical topological relationship, and the new side that is closest to the geographical proximity of the device is selected as the new S-GW.
  • Side S-GW Side S-GW.
  • a method for acquiring a serving gateway S-GW when the user equipment UE switches from the old mobile management node to the new mobile management node, includes: the new mobile management node receives a network protocol IP address of the data gateway of the UE sent by the old-side mobility management node; the new-side mobility management node sends a determination request to the data gateway according to the IP address, where the determination request carries the UE a new side location area identifier, such that the data gateway determines, according to the new side location area identifier, whether it can serve the UE as an S-GW; the new side mobility management node receives the response of the data gateway Message; when the response message includes When the IP address and the resource identifier of the data gateway are identified, the new mobile management node selects the data gateway as a new side S-GW.
  • a method for acquiring a serving gateway S-GW when the user equipment UE is handed over from the old mobile management node to the new mobile management node, includes: the S-GW receiving the a network protocol IP address of the data gateway of the UE sent by the old-side mobility management node; wherein the S-GW is obtained by the new-side mobility management node from a domain name system DNS server; The IP address of the data gateway sends a determination request to the data gateway, where the determination request carries a new location identifier of the UE, so that the data gateway determines whether it can be used as the S according to the new location identifier.
  • the S-GW provides service for the UE; the S-GW receives a response message of the data gateway; when the response message of the data gateway includes an IP address and a resource identifier of the data gateway, the S-GW will The IP address and resource identifier of the data gateway are sent to the new mobile management node, so that the new mobile management node selects the data gateway as a new side S-GW.
  • a method for acquiring a serving gateway S-GW when the user equipment UE is handed over from the old mobile management node to the new mobile management node, includes: the data gateway receiving the determination request, Determining that the request carries the new side location area identifier of the user equipment UE; the data gateway determines, according to the new side location area identifier, whether it can serve the UE as an S-GW; when the data gateway can serve as the S- When the GW provides a service to the UE, the data gateway sends a response message including an IP address and a resource identifier of the data gateway.
  • a mobility management node includes: a sending unit, configured to send a domain name resolution request to a domain name system DNS server according to the access information of the user equipment UE; wherein the access information includes The access point name APN of the UE or the old side location area identifier of the UE; the receiving unit, configured to receive a host name of the device returned by the DNS server according to the domain name resolution request; and an acquiring unit, configured to acquire a new side a host name of the available service gateway S-GW; a selecting unit, configured to select, according to a part of the host name of the device that represents a geographical topological relationship and a part of the host name of the new side available S-GW, that represents a geographical topological relationship The new side closest to the device in geographic topology may use the S-GW as the new side S-GW.
  • a mobility management node includes: a first receiving unit, configured to receive a network protocol IP address of a data gateway of a user equipment UE sent by an old mobile management node; and a sending unit, configured to: And sending, by the IP address, a determination request to the data gateway, where the determining request carries a new location location identifier of the UE, so that the data gateway determines, according to the new location identifier, whether it can serve as a serving gateway.
  • the S-GW provides a service for the UE; the second receiving unit is configured to receive a response message of the data gateway; and the selecting unit is configured to: when the response message includes When the IP address and resource identifier of the data gateway are identified, the data gateway is selected as the new side S-GW.
  • a service gateway includes: a first receiving unit, configured to receive a network protocol IP address of a data gateway of a user equipment UE sent by an old mobile management node; and a first sending unit, Sending a determination request to the data gateway according to the IP address of the data gateway, where the determination request carries a new location area identifier of the UE, so that the data gateway determines whether it is based on the new location identifier
  • the second receiving unit is configured to receive the response message of the data gateway, and the second sending unit is configured to: when the response message of the data gateway includes the IP address of the data gateway
  • the address and the resource identifier are sent to the new side mobility management node by the IP address and the resource identifier of the data gateway, so that the new side mobility management node selects the data gateway as the new side S-GW.
  • a data gateway provided by the embodiment of the present invention includes: a receiving unit, configured to receive a determining request, where the determining request carries a new side location area identifier of the user equipment UE; and a determining unit, configured to a side location area identifier, determining whether the data gateway is capable of serving the UE as an S-GW, and a sending unit, configured to send, when the data gateway is capable of serving the UE as an S-GW, The IP address of the data gateway and the response message of the resource identifier.
  • a system for acquiring a service gateway provided by an embodiment of the present invention includes a mobility management node and a DSN server as above.
  • a system for acquiring a service gateway provided by an embodiment of the present invention includes a mobility management node and a data gateway as above.
  • a system for acquiring a service gateway provided by an embodiment of the present invention includes the service gateway as above and the data gateway as above.
  • the method for acquiring a service gateway, the mobility management node, the data gateway, and the system provided by the embodiment of the present invention may select a new side service gateway that is closest to the physical gateway in the physical topology, or a physical topology on the old side mobility management node.
  • the closest new side service gateway, or the service gateway that is selected with the data gateway as the new side service gateway can reduce the user service data transmission delay added by the new side mobility management node after selecting the new side S-GW for the UE.
  • FIG. 1 is a flowchart of a method for acquiring an S-GW according to an embodiment of the present invention
  • FIG. 2 is a structural block diagram of a mobility management node according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for acquiring an S-GW according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for acquiring an S-GW according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for acquiring an S-GW according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a mobility management node according to an embodiment of the present invention.
  • FIG. 7 is a structural block diagram of a service gateway according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram of a data gateway according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a system for acquiring a service gateway according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a system for acquiring a service gateway according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of a system for acquiring a service gateway according to an embodiment of the present invention.
  • Data gateway gateway indicates the P-GW or the built-in GGSN/P-GW;
  • Joint gateway indicates the S-GW/P-GW of the joint construction or the S-GW/GGSN/P-GW of the joint construction;
  • Old side radio access network indicates the GSM/EDGE radio access network (GSM/EDGE Radio) where the UE moved before the UE Access Network, GERAN)/Universal Terrestrial Radio Access Network, UTRAN) / Evolved Universal Terrestrial Radio Access Network, E-UTRAN) coverage area;
  • GSM/EDGE Radio GSM/EDGE Radio
  • New side radio access network indicates the GERAN/UTRAN/E-UTRAN coverage area where the UE moves after being moved;
  • Old-side mobility management node indicates Gn/Gp SGSN and S4 used by the UE in the old-side radio access network. SGSN or MME;
  • New side mobility management node indicating the S4 SGSN or MME used by the UE in the new side radio access network
  • S-GW Old Side Service Gateway (Serving) Gateway, S-GW: indicates the S-GW used by the UE in the old side radio access network;
  • New Side S-GW Indicates the S-GW used by the UE when it is in the new side radio access network.
  • FIG. 1 is a flowchart of an implementation of a method for acquiring an S-GW according to an embodiment of the present invention.
  • an execution entity of the process is a new mobile management node, which is described in detail as follows:
  • Step S101 The new-side mobility management node sends a domain name resolution request to the domain name system DNS server according to the access information of the UE, where the access information includes an access point name of the UE (Access) Point Name, APN) or the old side location area identifier of the UE.
  • the access information includes an access point name of the UE (Access) Point Name, APN) or the old side location area identifier of the UE.
  • the new-side mobility management node may be based on the APN used by the UE on the old-side mobility management node or the location area identifier of the UE in the old-side radio access network.
  • the DNS server sends a domain name resolution request.
  • the DNS server will perform the corresponding name authority pointer according to the received domain name resolution request (Naming) Authority Pointer, NAPTR) records the DNS query to return the host name of the corresponding device to the new mobile management node for the domain name resolution request.
  • the access information of the UE may be sent by the old mobile management node to the new mobile management node, or may be sent by the old mobile management node to the home subscriber server (Home). Subscriber Server, HSS).
  • Step S102 The new mobile management node receives a host name of the device returned by the DNS server according to the domain name resolution request.
  • step S101 is specifically: the new mobile management node sends the domain name resolution request to the DNS server, and the domain name resolution is performed.
  • the request includes a domain name composed of the APNs.
  • step S102 is specifically: the new mobile management node receives the host name of the data gateway returned by the DNS server according to the domain name resolution request.
  • the new mobile management node groups each APN sent by the old mobile management node into a domain name, and sends a domain name resolution request to the DNS server according to each domain name.
  • the DNS server After receiving the domain name resolution request, the DNS server performs a DNS query of the NAPTR record, and returns a host name of the queried data gateway to the new mobile management node for each domain name resolution request.
  • step S101 is specifically: the new side mobility management node sends the domain name resolution request to the DNS server, where The domain name resolution request includes a domain name of the old side mobility management node formed according to the old side location area identifier.
  • step S102 is specifically: the new mobile management node receives the host name of the old mobile management node returned by the DNS server according to the domain name resolution request.
  • the location area identifier includes but is not limited to the tracking area identifier (Tracking Area) Identity, TAI), Routing Area Identity (RAI), Mobility Management Entity Identity, MME ID), Radio Network Controller Identity (RNC) ID) or E-UTRAN NodeB Identity (eNodeB ID).
  • TAI Track Area
  • RAI Routing Area Identity
  • MME ID Mobility Management Entity Identity
  • RNC Radio Network Controller Identity
  • eNodeB ID E-UTRAN NodeB Identity
  • Step S103 The new-side mobility management node acquires a host name of a new-side available S-GW.
  • a specific implementation of step 103 may be: the new-side mobility management node sends a domain name resolution request to the DNS server according to the location domain identifier of the UE in the location area of the new-side radio access network, and the DNS server receives the domain name resolution request. After the domain name resolution request, the DNS query of the NAPTR record is performed, and the host name of the S-GW that can be used by the queried UE is returned to the new mobile management node.
  • Step S104 The new-side mobility management node selects, according to the part of the host name of the device, the part that represents the geographic topological relationship and the part of the host name of the new-side available S-GW that represents the geographical topological relationship, The new side closest to the geographic topology may use the S-GW as the new side S-GW.
  • step S104 is specifically: the new-side mobility management node performs a part of a geographic topological relationship according to a host name of the data gateway.
  • the new side may use a part of the host name of the S-GW to represent the geographic topological relationship, and select the new side available S-GW that is closest to the data gateway in the geographic topology as the new side S-GW.
  • the new-side mobility management node may select a host name of the data gateway according to the plurality of APNs respectively, and may select a host name of the data gateway, and According to the host name of the selected data gateway, the new side S-GW that is closest to the geographic topology is selected as the new side S-GW.
  • step S104 is specifically: the new side mobility management node is represented according to the host name of the old side mobility management node.
  • the part of the geographic topological relationship and the part of the new side that can represent the geographical topological relationship in the host name of the S-GW, and the new side that is closest to the old side mobility management node in the geographical topology is selected as the available S-GW.
  • New side S-GW is selected as the available S-GW.
  • each device has several hostnames (Hostname), and each hostname is configured with three tags in the following format:
  • topon
  • ”topoff Indicates whether the host name contains geolocation information. “topon” means that the host name contains geographic topology information;
  • Single-label-interface-name Specifies an interface name, which can be the same as the actual physical interface or inconsistent, and a network node can have multiple interfaces.
  • Canonical-node-name The node name of the specification, which is used to identify a network node and can reflect the geographical topological relationship between different network nodes. Starting from the end point name, the more the same point name, the closer the geographical topological relationship between the two network nodes.
  • a network node Since a network node has only one canonical-node-name, it can be judged whether the two devices belong to the same network node by comparing whether the canonical-node-names of the host names of the two devices are identical, or two host names are determined. The degree of similarity of the canonical-node-name is used to determine the distance between the two devices in the geographical topological relationship, and the above judgment process does not need to consider the "topon"
  • the definition of the host name of the device may be related to the development of the technology, wherein the structure, location, length, and definition of the part representing the geographical topological relationship of the device change, and the above examples of the host name of the device do not constitute Limitations on embodiments of the invention.
  • the host name of the data gateway of the UE or the old mobile management node is queried by the access information, and the data gateway of the UE or the old mobile management node of the UE is selected by the host name.
  • the nearest service gateway in the topology can reduce the delay of user service data transmission caused by the service gateway that selects the farther geographical topology distance as the new side service gateway.
  • the mobility management node may be an SGSN or an MME located in a communication system such as GERAN, UTRAN, or E-UTRAN, and the most new mobile management node. The method shown in FIG. 1 of the embodiment of the present invention is performed.
  • the mobility management node includes:
  • the sending unit 21 is configured to send, according to the access information of the user equipment UE, a domain name resolution request to the domain name system DNS server, where the access information includes an access point name APN of the UE or an old side location area of the UE Identification
  • the receiving unit 22 is configured to receive a host name of the device returned by the DNS server according to the domain name resolution request;
  • An obtaining unit 23 configured to acquire a host name of a new side available service gateway S-GW;
  • the selecting unit 24 is configured to select, according to a part of the host name of the device, a part that represents a geographical topological relationship and a part of the host name of the new side available S-GW that represents a geographical topological relationship, and select the most geographically topological device with the device.
  • the new side close to the S-GW can be used as the new side S-GW.
  • the sending unit 21 is specifically configured to send the domain name resolution request to the DNS server, where the domain name resolution request includes According to the domain name composed of the APN.
  • the receiving unit 22 is specifically configured to receive a host name of the data gateway returned by the DNS server according to the domain name resolution request.
  • the sending unit 21 is specifically configured to send the domain name resolution request to the DNS server.
  • the domain name resolution request includes a domain name of an old-side mobility management node formed according to the old-side location area identifier.
  • the receiving unit 22 is specifically configured to receive a host name of the old mobile management node returned by the DNS server according to the domain name resolution request.
  • the mobility management node provided by the embodiment of the present invention can query the data gateway of the UE or the host name of the old mobile management node by using the access information, and select the data gateway of the UE or the old mobile management node of the UE by using the host name.
  • the nearest serving gateway in the geographic topology acts as a new side serving gateway, which can reduce the delay of user service data transmission caused by the service gateway selecting a farther geographical topological distance as the new side serving gateway.
  • FIG. 3 is a flowchart showing an implementation process of a method for acquiring an S-GW according to another embodiment of the present invention, which is described in detail as follows:
  • Step S301 the new mobile management node receives the network protocol of the data gateway of the UE sent by the old mobile management node (Internet) Protocol, IP) address.
  • Internet Internet Protocol
  • Step S302 The new-side mobility management node sends a determination request to the data gateway according to the IP address, where the determination request carries a new-side location area identifier of the UE, so that the data gateway is based on the new side.
  • the location area identifier determines whether it can serve the UE as an S-GW.
  • the determining request may be a create session request (Create Session Request).
  • the location area identifier includes but is not limited to the TAI, RAI, cell identity, eNodeB ID, RNC ID, eNodeB IP address, or RNC of the UE. IP address, etc.
  • the data gateway can determine whether the UE is located in the serviceable area of the data gateway according to the location area identifier of the UE, thereby determining whether it can serve the UE as the S-GW.
  • Step S303 The new mobile management node receives the response message of the data gateway.
  • the response message may be a create session response sent by the data gateway to the new mobile management node (Create Session Response).
  • Step S304 When the response message includes an IP address and a resource identifier of the data gateway, the new-side mobility management node selects the data gateway as a new-side S-GW.
  • the resource identifier of the data gateway includes but is not limited to a tunnel endpoint identifier (Tunnel Endpoint) Identifier, TEID) or qualified PDN gateway connection set identifier (Fully Qualified PDN Connection Set) Identifier, FQ-CSID).
  • TEID tunnel endpoint identifier
  • FQ-CSID FQ-CSID
  • step S305 when the response message does not include the IP address and the resource identifier of the data gateway, the new-side mobility management node acquires a new-side S-GW from the domain name system DNS server.
  • the method for obtaining a serving gateway determines whether the data gateway of the UE can serve the UE as the S-GW, thereby selecting a data gateway of the UE capable of providing the S-GW service for the UE as the new side S-
  • the GW that is, the joint gateway is selected as the new side S-GW, can reduce the increase of the user service data transmission delay caused by the service gateway that selects the farther geographical topological distance as the new side service gateway.
  • FIG. 4 is a flowchart showing an implementation of a method for acquiring an S-GW according to another embodiment of the present invention.
  • the implementation body of the present invention is obtained by the new mobile management node from a DNS server.
  • the S-GW is detailed as follows:
  • Step 401 The S-GW receives a network protocol IP address of a data gateway of the UE sent by the old mobile management node.
  • the IP address of the data gateway is sent by the old mobile management node to the new mobile management node, and is sent by the new mobile management node to the S by creating a session request message. -GW's.
  • Step S402 The S-GW sends a determination request to the data gateway according to the IP address of the data gateway, where the determination request carries a new location area identifier of the UE, so that the data gateway is configured according to the new The side location area identifier determines whether it can serve the UE as an S-GW.
  • the determining request may be a modify bearer request (Modify Bearer) Request).
  • Step S403 The S-GW receives a response message of the data gateway.
  • the response message may be a modify bearer response message (Modify Bearer) Response).
  • Step S404 When the response message of the data gateway includes the IP address and the resource identifier of the data gateway, the S-GW sends the IP address and the resource identifier of the data gateway to the new mobile management node, The new side mobility management node is caused to select the data gateway as a new side S-GW.
  • the resource identifier of the data gateway includes but is not limited to a tunnel endpoint identifier (Tunnel Endpoint) Identifier, TEID) or qualified PDN gateway connection set identifier (Fully Qualified PDN Connection Set) Identifier, FQ-CSID).
  • TEID tunnel endpoint identifier
  • FQ-CSID FQ-CSID
  • step S405 when the response message does not include the IP address and the resource identifier of the data gateway, the S-GW sends its own IP address and resource identifier to the new mobile management node, so that The new side mobility management node selects the S-GW as a new side S-GW.
  • the implementation principle related to the embodiment shown in FIG. 4 is the same as the embodiment shown in FIG. 3 of the present invention, except that in the embodiment shown in FIG. 3, after knowing that no data gateway can serve as the S-GW for the UE, The new mobile management node obtains the new side S-GW by sending a domain name resolution request to the DNS server. In the embodiment shown in FIG. 4, the new mobile management node first obtains the temporary by sending a domain name resolution request to the DNS server. The S-GW, when no data gateway can serve the UE as the S-GW, uses the temporary S-GW as the new side S-GW of the UE.
  • the method for obtaining a serving gateway provided by the embodiment shown in FIG. 4, by determining whether the data gateway of the UE can serve the UE as an S-GW, thereby selecting a data gateway of the UE capable of providing the S-GW service for the UE as a new
  • the side S-GW that is, the joint gateway is selected as the new side S-GW, can reduce the increase of the user service data transmission delay caused by the service gateway that selects the farther geographical topological distance as the new side service gateway.
  • the temporary S-GW can be directly selected when the data gateway cannot serve the UE as the S-GW.
  • the new side S-GW simplifies the signaling process and avoids re-disabling the DNS system to acquire a new S-GW as the new side S-GW.
  • the execution body of the implementation process of the method for acquiring the S-GW shown in FIG. 5 is a data gateway, and the flow corresponds to the method flow of the embodiment shown in FIG. 3 or FIG. 4, and the details are as follows:
  • Step S501 The data gateway receives a determination request, where the determination request carries a new side location area identifier of the user equipment UE.
  • the determination request received by the data gateway may be from the new-side mobility management node in the embodiment shown in FIG. 3 of the present invention, or from the S-GW in the embodiment shown in FIG.
  • Step S502 The data gateway determines, according to the new side location area identifier, whether it can provide services for the UE as an S-GW.
  • Step S503 when the data gateway is capable of serving the UE as the S-GW, the data gateway sends a response message including an IP address and a resource identifier of the data gateway, indicating that the data gateway is selected as the The new side S-GW of the UE.
  • step S504 when the data gateway is unable to serve the UE as the S-GW, the data gateway sends a response indicating that the PDN gateway cannot serve as the S-GW to provide the UE. Message.
  • the principle of the method for acquiring the S-GW in the embodiment shown in FIG. 5 is the same as the principle in the embodiment shown in FIG. 3 or FIG.
  • the data gateway of the UE determines whether it can serve the UE as the S-GW, and selects the data gateway of the UE that can provide the S-GW service for the UE as the new side S-GW, that is, selects the joint gateway as the new side S. -GW, which can reduce the increase of user service data transmission delay caused by the service gateway selecting a farther geographical topological distance as the new side service gateway.
  • FIG. 6 is a structural block diagram of a mobility management node according to an embodiment of the present invention.
  • the mobility management node may be an SGSN or an MME located in a communication system such as GERAN, UTRAN, or E-UTRAN, as a new mobility management node. Used to perform the method shown in FIG. 3 of an embodiment of the present invention.
  • the mobility management node includes:
  • the first receiving unit 61 is configured to receive a network protocol IP address of a data gateway of the user equipment UE sent by the old mobile management node.
  • the sending unit 62 is configured to send, by using the IP address, a determination request to the data gateway, where the determination request carries a new location area identifier of the UE, so that the data gateway determines according to the new location identifier Whether it can serve the UE as a serving gateway S-GW.
  • the second receiving unit 63 is configured to receive a response message of the data gateway.
  • a selecting unit 64 configured to: when the response message includes When the IP address and resource identifier of the data gateway are identified, the data gateway is selected as the new side S-GW.
  • the selecting unit 64 is further configured to: acquire the new side S-GW from the domain name system DNS server when the response message does not include the IP address and the resource identifier of the data gateway.
  • the working mode of the mobility management node shown in FIG. 6 is the same as that of the embodiment shown in FIG. 3, and details are not described herein.
  • the mobility management node shown in FIG. 6 determines whether the data gateway of the UE can serve the UE as the S-GW, thereby selecting a data gateway of the UE capable of providing the S-GW service for the UE as the new side S-GW, that is, Selecting the joint gateway as the new side S-GW can reduce the delay of the user service data transmission delay caused by the service gateway that selects the farther geographical topological distance as the new side service gateway.
  • FIG. 7 is a structural block diagram of a service gateway according to an embodiment of the present invention.
  • the service gateway may be located in a communication system such as GERAN, UTRAN, or E-UTRAN for performing the method shown in FIG. 4.
  • the service gateway includes:
  • a first receiving unit 71 configured to receive a network protocol IP address of a data gateway of the user equipment UE sent by the old mobile management node;
  • the first sending unit 72 is configured to send, by using the IP address of the data gateway, a determination request to the data gateway, where the determining request carries a new side location area identifier of the UE, so that the data gateway is configured according to the new The side location area identifier determines whether it can serve the UE as an S-GW;
  • a second receiving unit 73 configured to receive a response message of the data gateway
  • the second sending unit 74 is configured to: when the response message of the data gateway includes the IP address and the resource identifier of the data gateway, send the IP address and the resource identifier of the data gateway to the new mobile management node, so that the The new mobile management node selects the data gateway as a new side S-GW.
  • the second sending unit 74 is further configured to: when the response message does not include the IP address and the resource identifier of the data gateway, send the IP address and the resource identifier of the S-GW to the new The side moves the management node such that the new side mobility management node selects the S-GW as a new side S-GW.
  • the working mode of the service gateway shown in FIG. 7 is the same as that of the embodiment shown in FIG. 4, and details are not described herein.
  • the serving gateway provided by the embodiment shown in FIG. 7 determines whether the data gateway of the UE can serve the UE as the S-GW, thereby selecting a data gateway of the UE capable of providing the S-GW service for the UE as the new side S-
  • the GW that is, the joint gateway is selected as the new side S-GW, can reduce the increase of the user service data transmission delay caused by the service gateway that selects the farther geographical topological distance as the new side service gateway.
  • the temporary S-GW can be directly selected when the data gateway cannot serve the UE as the S-GW.
  • the new side S-GW simplifies the signaling process and avoids re-disabling the DNS system to acquire a new S-GW as the new side S-GW.
  • FIG. 8 is a structural block diagram of a data gateway according to an embodiment of the present invention.
  • the data gateway gateway may be located in a communication system such as GERAN, UTRAN, or E-UTRAN for performing the method shown in FIG. 5.
  • the data gateway can be a P-GW or a built-in GGSN/P-GW.
  • the data gateway includes:
  • the receiving unit 81 is configured to receive a determination request, where the determination request carries a new side location area identifier of the user equipment UE;
  • the determining unit 82 is configured to determine, according to the new side location area identifier, whether the data gateway can serve as the S-GW for the UE.
  • the sending unit 83 is configured to: when the data gateway is capable of serving the UE as the S-GW, send a response message including an IP address and a resource identifier of the data gateway.
  • the sending unit 83 is further configured to: when the data gateway is unable to serve the UE as the S-GW, send a response message indicating that the data gateway is not capable of serving the UE as the S-GW. .
  • the working mechanism of the data gateway in the embodiment shown in FIG. 8 is the same as the working mechanism of the method for obtaining the service gateway in the embodiment shown in FIG. 5, and details are not described herein.
  • the data gateway of the embodiment shown in FIG. 8 determines whether it can serve the UE as the S-GW, and selects the data gateway of the UE that can provide the S-GW service for the UE as the new side S-GW, that is, selects the joint construction. As a new-side S-GW, the gateway can reduce the delay of user service data transmission caused by the serving gateway that selects a farther geographical topological distance as the new side serving gateway.
  • An embodiment of the present invention further provides a system for acquiring a service gateway, as shown in FIG. 9, including a mobility management node 91 and a DNS server 92.
  • the mobility management node 91 is the mobility management node shown in FIG. 2.
  • the system shown in Figure 9 works in the same manner as the method shown in Figure 1, and will not be described here.
  • the system queries the data gateway of the UE or the host name of the old mobile management node by using the access information, and selects the service gateway closest to the geographical topology of the data gateway of the UE or the old mobile management node of the UE as the new by the host name.
  • the side service gateway can reduce the delay of user service data transmission caused by the service gateway selecting a farther geographical topological distance as the new side service gateway.
  • An embodiment of the present invention further provides a system for acquiring a service gateway, as shown in FIG. 10, including a mobility management node 1001 and a data gateway 1002.
  • the mobility management node 1001 is the mobility management node shown in FIG. 6, and the data gateway 1002 is the data gateway shown in FIG.
  • the system shown in FIG. 10 works in the same manner as the method shown in FIG. 3 and will not be described here.
  • the system selects the data gateway of the UE that can provide the S-GW service for the UE as the new side S-GW by judging whether the data gateway of the UE can serve the UE as the S-GW, that is, selecting the joint gateway as the new side.
  • the S-GW can reduce the delay of the user service data transmission delay caused by the serving gateway that selects the farther geographical topological distance as the new side serving gateway.
  • An embodiment of the present invention further provides a system for acquiring a service gateway, as shown in FIG. 11, including a serving gateway 1101 and a data gateway 1102.
  • the service gateway 1101 is the service gateway shown in FIG. 7, and the data gateway 1102 is the data gateway shown in FIG. 8.
  • the system shown in FIG. 11 operates in the same manner as the method shown in FIG. 4 and will not be described here.
  • the system selects the data gateway of the UE that can provide the S-GW service for the UE as the new side S-GW by judging whether the data gateway of the UE can serve the UE as the S-GW, that is, selecting the joint gateway as the new side.
  • the S-GW can reduce the delay of the user service data transmission delay caused by the serving gateway that selects the farther geographical topological distance as the new side serving gateway. Further, by selecting a temporary S-GW and then determining whether the data gateway can serve the UE as the S-GW, the temporary S-GW can be directly selected when the data gateway cannot serve the UE as the S-GW.
  • the new side S-GW simplifies the signaling process and avoids re-disabling the DNS system to acquire a new S-GW as the new side S-GW.
  • modules in the devices in the embodiments may be distributed in the devices of the embodiments according to the embodiments, or may be correspondingly changed in one or more devices different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and 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.

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Abstract

本发明适用于移动通信领域，提供了获取服务网关的方法、移动管理节点、数据网关及系统。本发明实施例提供的一种获取服务网关的方法，包括：当UE从旧侧移动管理节点切换至新侧移动管理节点时，所述新侧移动管理节点根据所述UE的接入信息向域名系统DNS服务器发送域名解析请求；其中，所述接入信息包括所述UE的接入点名称APN或者所述UE的旧侧位置区域标识；接收所述DNS服务器根据所述域名解析请求返回的设备的主机名；获取新侧可用S-GW的主机名；根据所述设备的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述设备在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。通过上述方法能够减少新侧移动管理节点为UE选择新侧S-GW后带来的用户业务数据传输时延。

Description

获取服务网关的方法及移动管理节点、数据网关及系统 技术领域
本发明属于移动通信领域，尤其涉及获取服务网关（Serving Gateway，S-GW）的方法、移动管理节点、数据网关及系统。
 背景技术
在演进型分组系统（Evolved Packet System，EPS）网络中，通过S4接口与S-GW连接的服务GPRS支持节点（Serving GPRS Support Node，SGSN）或者移动管理实体（Mobility Management Entity，MME）被称为S4 SGSN/MME。
用户设备（User Equipment, UE）在EPS网络内移动的过程中，分组数据网络网关（Packet Data Networks Gateway, P-GW）作为用户数据在EPS网络内的锚定点，不会发生变化，而S-GW可能会随着UE的位置移动而发生变化。UE从通用分组无线业务（General Packet Radio Service，GPRS）/通用移动通信系统（Universal Mobile Telecommunications System，UMTS）网络移动到EPS网络的过程中，网关GPRS支持节点（Gateway GPRS Support Node，GGSN）和P-GW作为用户数据在GPRS/UMTS网络及EPS网络内的锚定点，不会发生变化，而UE在GPRS/UMTS网络中不使用S-GW，移动至EPS网络后则需使用服务网关（Serving Gateway, S-GW）。在上述两种情况下，新侧移动管理节点（S4 SGSN/MME）在为UE选择新侧S-GW后，可能会增加用户业务数据的传输时延。
 技术问题
本发明实施例提供一种获取服务网关的方法、移动管理节点、数据网关及系统，用于减少新侧移动管理节点为UE选择新侧S-GW后增加的用户业务数据传输时延。
 技术解决方案
一方面，本发明实施例提供的一种获取服务网关S-GW的方法，当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，包括：所述新侧移动管理节点根据所述UE的接入信息向域名系统DNS服务器发送域名解析请求；其中，所述接入信息包括所述UE的接入点名称APN或者所述UE的旧侧位置区域标识；所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的设备的主机名；所述新侧移动管理节点获取新侧可用S-GW的主机名；所述新侧移动管理节点根据所述设备的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述设备在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。
另一方面，本发明实施例提供的一种获取服务网关S-GW的方法，当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，包括：所述新侧移动管理节点接收所述旧侧移动管理节点发送的所述UE的数据网关的网络协议IP地址；所述新侧移动管理节点根据所述IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务；所述新侧移动管理节点接收所述数据网关的响应消息；当所述响应消息包括 所述数据网关的IP地址和资源标识时，所述新侧移动管理节点选择所述数据网关作为新侧S-GW。
又一方面，本发明实施例提供的一种获取服务网关S-GW的方法，当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，包括：所述S-GW接收所述旧侧移动管理节点发送的所述UE的数据网关的网络协议IP地址；其中，所述S-GW为所述新侧移动管理节点从域名系统DNS服务器中获取的；所述S-GW根据所述数据网关的IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务；所述S-GW接收所述数据网关的响应消息；当所述数据网关的响应消息包括所述数据网关的IP地址和资源标识，所述S-GW将所述数据网关的IP地址和资源标识发送给所述新侧移动管理节点，以使所述新侧移动管理节点选择所述数据网关为新侧S-GW。
又一方面，本发明实施例提供的一种获取服务网关S-GW的方法，当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，包括：数据网关接收判断请求，所述判断请求携带用户设备UE的新侧位置区域标识；所述数据网关根据所述新侧位置区域标识，判断自身是否能够作为S-GW为所述UE提供服务；当所述数据网关能够作为S-GW为所述UE提供服务时，所述数据网关发送包括所述数据网关的IP地址和资源标识的响应消息。
又一方面，本发明实施例提供的一种移动管理节点，包括：发送单元，用于根据用户设备UE的接入信息向域名系统DNS服务器发送域名解析请求；其中，所述接入信息包括所述UE的接入点名称APN或者所述UE的旧侧位置区域标识；接收单元，用于接收所述DNS服务器根据所述域名解析请求返回的设备的主机名；获取单元，用于获取新侧可用服务网关S-GW的主机名；选择单元，用于根据所述设备的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述设备在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。
又一方面，本发明实施例提供的一种移动管理节点，包括：第一接收单元，用于接收旧侧移动管理节点发送的用户设备UE的数据网关的网络协议IP地址；发送单元，用于根据所述IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为服务网关S-GW为所述UE提供服务；第二接收单元，用于接收所述数据网关的响应消息；选择单元，用于当所述响应消息包括 所述数据网关的IP地址和资源标识时，选择所述数据网关作为新侧S-GW。
又一方面，本发明实施例提供的一种服务网关，包括：第一接收单元，用于接收旧侧移动管理节点发送的用户设备UE的数据网关的网络协议IP地址；第一发送单元，用于根据所述数据网关的IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务；第二接收单元，用于接收所述数据网关的响应消息；第二发送单元，用于当所述数据网关的响应消息包括所述数据网关的IP地址和资源标识，将所述数据网关的IP地址和资源标识发送给新侧移动管理节点，以使所述新侧移动管理节点选择所述数据网关为新侧S-GW。
又一方面，本发明实施例提供的一种数据网关，包括：接收单元，用于接收判断请求，所述判断请求携带用户设备UE的新侧位置区域标识；判断单元，用于根据所述新侧位置区域标识，判断所述数据网关是否能够作为S-GW为所述UE提供服务；发送单元，用于当所述数据网关能够作为S-GW为所述UE提供服务时，发送包括所述数据网关的IP地址和资源标识的响应消息。
又一方面，本发明实施例提供的一种获取服务网关的系统包括如上的移动管理节点和DSN服务器。
又一方面，本发明实施例提供的一种获取服务网关的系统包括如上的移动管理节点和数据网关。
再一方面，本发明实施例提供的一种获取服务网关的系统包括如上的服务网关和如上的数据网关。
 有益效果
通过本发明实施例提供的获取服务网关的方法、移动管理节点、数据网关及系统，可以选择和数据网关在物理拓扑上最接近的新侧服务网关，或者和旧侧移动管理节点在物理拓扑上最接近的新侧服务网关，或者选择和数据网关合建的服务网关作为新侧服务网关，能够减少新侧移动管理节点为UE选择新侧S-GW后增加的用户业务数据传输时延。
 附图说明
图1是本发明一实施例提供的一种获取S-GW的方法流程图；
图2是本发明一实施例提供的一种移动管理节点的结构框图；
图3是本发明一实施例提供的一种获取S-GW的方法流程图；
图4是本发明一实施例提供的一种获取S-GW的方法流程图；
图5是本发明一实施例提供的一种获取S-GW的方法流程图；
图6是本发明一实施例提供的一种移动管理节点的结构框图；
图7是本发明一实施例提供的一种服务网关的结构框图；
图8是本发明一实施例提供的一种数据网关的结构框图；
图9是本发明一实施例提供的一种获取服务网关的系统的示意图；
图10是本发明一实施例提供的一种获取服务网关的系统的示意图；
图11是本发明一实施例提供的一种获取服务网关的系统的示意图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
需要说明的是，为了方便描述，对本说明书中出现的下列术语进行如下约定：
数据网关网关：表示P-GW或者合建的GGSN/P-GW；
合建网关：表示合建的S-GW/P-GW或者合建的S-GW/GGSN/P-GW；
旧侧无线接入网：表示UE移动前所在的GSM/EDGE无线接入网（GSM/EDGE Radio Access Network，GERAN）/通用陆地无线接入网（Universal Terrestrial Radio Access Network，UTRAN）/演进型通用陆地无线接入网（Evolved Universal Terrestrial Radio Access Network，E-UTRAN）覆盖区域；
新侧无线接入网：表示UE移动后所在GERAN/UTRAN/E-UTRAN覆盖区域；
旧侧移动管理节点：表示UE在旧侧无线接入网时使用的Gn/Gp SGSN、S4 SGSN或者MME；
新侧移动管理节点：表示UE在新侧无线接入网时使用的S4 SGSN或MME；
旧侧服务网关（Serving Gateway，S-GW）：表示UE在旧侧无线接入网时使用的S-GW；
新侧S-GW：表示UE在新侧无线接入网时使用的S-GW。
图1示出了本发明一实施例提供的获取S-GW的方法的实现流程，在本实施例中，流程的执行主体为新侧移动管理节点，详述如下：
当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，
步骤S101、所述新侧移动管理节点根据所述UE的接入信息向域名系统DNS服务器发送域名解析请求；其中，所述接入信息包括所述UE的接入点名称（Access Point Name, APN）或者所述UE的旧侧位置区域标识。
在本实施例中，当新侧移动管理节点接收到UE的接入请求后，可以根据该UE在旧侧移动管理节点使用的APN或者该UE在旧侧无线接入网的位置区域标识，向DNS服务器发送域名解析请求。DNS服务器会根据接收到的域名解析请求进行相应的名称权威指针（Naming Authority Pointer，NAPTR）记录的DNS查询，以针对域名解析请求向新侧移动管理节点返回查询到的相应的设备的主机名。其中，UE的接入信息可以由旧侧移动管理节点发送至新侧移动管理节点，也可以由旧侧移动管理节点通过归属用户服务器（Home Subscriber Server, HSS）获取。
步骤S102、所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的设备的主机名。
作为本发明实施例的一种场景，当所述接入信息包括所述APN时，步骤S101具体为：所述新侧移动管理节点向所述DNS服务器发送所述域名解析请求，所述域名解析请求包括根据所述APN组成的域名。
相应的，步骤S102具体为：所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的数据网关的主机名。
在该场景中，当有多个APN时，新侧移动管理节点将旧侧移动管理节点发送的每个APN分别组成一个域名，并根据每一个域名分别向DNS服务器发送一条域名解析请求。DNS服务器在接收到上述域名解析请求后进行NAPTR记录的DNS查询，并针对每条域名解析请求向新侧移动管理节点返回查询到的数据网关的主机名。
作为本发明实施例的另一个场景，当所述接入信息包括所述位置区域标识时，步骤S101具体为：所述新侧移动管理节点向所述DNS服务器发送所述域名解析请求，所述域名解析请求包括根据所述旧侧位置区域标识组成的所述旧侧移动管理节点的域名。
相应地，步骤S102具体为：所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的所述旧侧移动管理节点的主机名。
在本场景中，位置区域标识包括但不限于跟踪区标识（Tracking Area Identity，TAI）、路由区标识（Routin Area Identity，RAI）、移动管理实体标识（Mobility Management Entity Identity，MME ID）、无线网络控制器（Radio Network Controller Identity，RNC ID）或者演进型网络基站标识（E-UTRAN NodeB Identity，eNodeB ID）。
步骤S103：所述新侧移动管理节点获取新侧可用S-GW的主机名。
示例性的，步骤103的一种具体实现可以为：新侧移动管理节点根据所述UE在新侧无线接入网的位置区域标识组成域名，向DNS服务器发送域名解析请求，DNS服务器在接收到上述域名解析请求后进行NAPTR记录的DNS查询，并向新侧移动管理节点返回查询到的UE可使用的S-GW的主机名。
步骤S104：所述新侧移动管理节点根据所述设备的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述设备在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。
作为本发明实施例的一种场景，当所述接入信息包括所述APN时，步骤S104具体为：所述新侧移动管理节点根据所述数据网关的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述数据网关在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。
在该场景中，当接入信息包括多个APN，新侧移动管理节点根据所述多个APN分别从DNS服务器获取多个数据网关的主机名时，可以任选一个数据网关的主机名，并根据该被选择的数据网关的主机名，选择在地理拓扑上最接近的新侧可用S-GW作为新侧S-GW。
作为本发明实施例的另一种场景，当所述接入信息包括所述位置区域标识时，步骤S104具体为：所述新侧移动管理节点根据所述旧侧移动管理节点的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述旧侧移动管理节点在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。
示例性的，在第三代合作伙伴计划（the 3rd Generation Partner Project，3GPP）协议中，每个设备有若干主机名（Hostname），每个主机名配置有三个标签，格式如下：
<“topon”|“topoff”><single-label-interface-name><canonical-node-name>，
其中：
“topon”|“topoff”：指示该主机名中是否包含了地理拓扑信息。“topon”表示主机名中包含了地理拓扑信息；
single-label-interface-name：接口名称，仅作为一个标识，可以与实际的物理接口一致，也可以不一致，且一个网络节点可以有多个接口。
canonical-node-name：规范的节点名称，用于标识一个网络节点，可以体现出不同网络节点间的地理拓扑关系。从末尾的点分名称开始比较，相同的点分名称越多，表明两个网络节点之间的地理拓扑关系越近。
由于一个网络节点只有一个canonical-node-name，因此可以通过比较两个设备的主机名的canonical-node-name是否完全相同来判断两个设备是否属于同一个网络节点，或者判断两个主机名的canonical-node-name的相似程度来判断两个设备在地理拓扑关系上的远近，且上述判断过程不需要考虑“topon”|“topoff”和single-label-interface-name标签。
本领域普通技术人员应知，设备主机名的定义可能随着技术的发展，其中表示设备地理拓扑关系的部分的结构、位置、长度、定义发生变化，以上对于设备主机名的举例，并不构成对于本发明实施例的限制。
在图1所示的实施例中，通过接入信息查询UE的数据网关或者旧侧移动管理节点的主机名，并通过主机名来选择与UE的数据网关或者UE的旧侧移动管理节点在地理拓扑上最近的服务网关作为新侧服务网关，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。
图2示出了本发明实施例提供的移动管理节点的结构框图，该移动管理节点可以为位于GERAN、UTRAN或者E-UTRAN等通信系统中的SGSN或者MME，最为新侧移动管理节点，用于执行本发明实施例图1所示的方法。
参照图2，该移动管理节点包括：
发送单元21，用于根据用户设备UE的接入信息向域名系统DNS服务器发送域名解析请求；其中，所述接入信息包括所述UE的接入点名称APN或者所述UE的旧侧位置区域标识；
接收单元22，用于接收所述DNS服务器根据所述域名解析请求返回的设备的主机名；
获取单元23，用于获取新侧可用服务网关S-GW的主机名；
选择单元24，用于根据所述设备的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述设备在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。
作为本发明实施例的一种应用场景，当所述接入信息包括所述UE的APN时，发送单元21具体用于，向所述DNS服务器发送所述域名解析请求，所述域名解析请求包括根据所述APN组成的域名。相应地，接收单元22具体用于接收所述DNS服务器根据所述域名解析请求返回的数据网关的主机名。
作为本发明实施例的另一种场景，当所述接入信息包括所述UE的旧侧位置区域标识时，所述发送单元21具体用于，向所述DNS服务器发送所述域名解析请求，所述域名解析请求包括根据所述旧侧位置区域标识组成的旧侧移动管理节点的域名。相应地，所述接收单元22具体用于，接收所述DNS服务器根据所述域名解析请求返回的所述旧侧移动管理节点的主机名。
通过本发明实施例提供的移动管理节点，能够通过接入信息查询UE的数据网关或者旧侧移动管理节点的主机名，并通过主机名来选择与UE的数据网关或者UE的旧侧移动管理节点在地理拓扑上最近的服务网关作为新侧服务网关，可减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。
图3示出了本发明又一实施例提供的获取S-GW的方法的实现流程，详述如下：
当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，
步骤S301、所述新侧移动管理节点接收所述旧侧移动管理节点发送的所述UE的数据网关的网络协议（Internet Protocol，IP）地址。
步骤S302、所述新侧移动管理节点根据所述IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务。
作为本发明实施例的一种具体实现，所述判断请求可以为创建会话请求（Create Session Request）。位置区域标识包括但不限于UE的TAI、RAI、小区标识、eNodeB ID、RNC ID、eNodeB IP地址或者RNC IP地址等。
本领域普通技术人员应知，数据网关根据UE的位置区域标识，即能够判断出该UE是否位于该数据网关的可服务区域内，由此判断其是否能够作为S-GW为UE提供服务。
步骤S303、所述新侧移动管理节点接收所述数据网关的响应消息。
作为本发明实施例的一种具体实现，该响应消息可以是数据网关发送给新侧移动管理节点的创建会话响应（Create Session Response）。
步骤S304、当所述响应消息包括所述数据网关的IP地址和资源标识时，所述新侧移动管理节点选择所述数据网关作为新侧S-GW。
示例性的，数据网关的资源标识包括但不限于隧道端点标识（Tunnel Endpoint Identifier，TEID）或者合格PDN网关连接集标识（Fully Qualified PDN Connection Set Identifier，FQ-CSID）。
可选的，步骤S305、当所述响应消息不包括所述数据网关的IP地址和资源标识时，所述新侧移动管理节点从域名系统DNS服务器中获取新侧S-GW。
本发明实施例提供的获取服务网关的方法，通过判断UE的数据网关是否能够作为S-GW为UE提供服务，从而选择能为UE提供S-GW服务的UE的数据网关来作为新侧S-GW，即选择合建网关作为新侧S-GW，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。
图4示出了本发明又一实施例提供的获取S-GW的方法的实现流程，与本发明图3所示实施例不同的是，其执行主体为新侧移动管理节点从DNS服务器中获取的S-GW，详述如下：
步骤401、所述S-GW接收所述旧侧移动管理节点发送的所述UE的数据网关的网络协议IP地址。
作为本发明实施例的一种具体实现，所述数据网关的IP地址是由旧侧移动管理节点发送至新侧移动管理节点，并由新侧移动管理节点通过创建会话请求消息发送至所述S-GW的。
步骤S402、所述S-GW根据所述数据网关的IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务。
作为本发明实施例的一种具体实现，所述判断请求可以为修改承载请求（Modify Bearer Request）。
步骤S403、所述S-GW接收所述数据网关的响应消息。
作为本发明实施例的一种具体实现，该响应消息可以是修改承载响应消息（Modify Bearer Response）。
步骤S404、当所述数据网关的响应消息包括所述数据网关的IP地址和资源标识，所述S-GW将所述数据网关的IP地址和资源标识发送给所述新侧移动管理节点，以使所述新侧移动管理节点选择所述数据网关为新侧S-GW。
示例性的，数据网关的资源标识包括但不限于隧道端点标识（Tunnel Endpoint Identifier，TEID）或者合格PDN网关连接集标识（Fully Qualified PDN Connection Set Identifier，FQ-CSID）。
可选的，步骤S405、当所述响应消息不包括所述数据网关的IP地址和资源标识，所述S-GW将自身的IP地址和资源标识发送给所述新侧移动管理节点，以使所述新侧移动管理节点选择所述S-GW为新侧S-GW。
图4所示的实施例相关的实现原理与本发明图3所示实施例相同，不同的是在图3所示的实施例中，当获知没有数据网关可以作为S-GW为UE服务之后，新侧移动管理节点再通过向DNS服务器发送域名解析请求来获取新侧S-GW，而在图4所示实施例中，新侧移动管理节点先通过向DNS服务器发送域名解析请求来获取临时的S-GW，当没有数据网关可以作为S-GW为UE服务时，将该临时的S-GW作为UE的新侧S-GW。
图4所示的实施例提供的获取服务网关的方法，通过判断UE的数据网关是否能够作为S-GW为UE提供服务，从而选择能为UE提供S-GW服务的UE的数据网关来作为新侧S-GW，即选择合建网关作为新侧S-GW，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。进一步的，通过先选择临时的S-GW，再判断数据网关能否作为S-GW为UE提供服务，可以在数据网关不能作为S-GW为UE提供服务时，直接选用临时的S-GW作为新侧S-GW，简化了信令流程，避免了重新去DNS系统获取新的S-GW来作为新侧S-GW。
图5所示的获取S-GW的方法的实现流程的执行主体为数据网关，该流程分别与图3或图4所示实施例的方法流程相对应，详述如下：
步骤S501、数据网关接收判断请求，所述判断请求携带用户设备UE的新侧位置区域标识。
作为本发明实施例的一种具体实现，数据网关接收的判断请求可以来自本发明图3所示实施例中的新侧移动管理节点，或者来自图4所示实施例中的S-GW。
步骤S502、所述数据网关根据所述新侧位置区域标识，判断自身是否能够作为S-GW为所述UE提供服务。
步骤S503、当所述数据网关能够作为S-GW为所述UE提供服务时，所述数据网关发送包括所述数据网关的IP地址和资源标识的响应消息，指示选择所述数据网关作为所述UE的新侧S-GW。
可选的，步骤S504、当所述数据网关不能够作为S-GW为所述UE提供服务时，所述数据网关发送指示所述PDN网关不能够作为S-GW为所述UE提供服务的响应消息。
图5所示实施例的获取S-GW的方法的相关原理与图3或者图4所示实施例中的原理相同。通过UE的数据网关判断自身是否能够作为S-GW为UE提供服务，从而选择能为UE提供S-GW服务的UE的数据网关来作为新侧S-GW，即选择合建网关作为新侧S-GW，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。
图6示出了本发明实施例提供的一种移动管理节点的结构框图，该移动管理节点可以为位于GERAN、UTRAN或者E-UTRAN等通信系统中的SGSN或者MME，作为新侧移动管理节点，用于执行本发明实施例图3所示的方法。
参照图6，该移动管理节点，包括：
第一接收单元61，用于接收旧侧移动管理节点发送的用户设备UE的数据网关的网络协议IP地址。
发送单元62，用于根据所述IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为服务网关S-GW为所述UE提供服务。
第二接收单元63，用于接收所述数据网关的响应消息。
选择单元64，用于当所述响应消息包括 所述数据网关的IP地址和资源标识时，选择所述数据网关作为新侧S-GW。
可选地，选择单元64还用于当所述响应消息不包括所述数据网关的IP地址和资源标识时，从域名系统DNS服务器中获取新侧S-GW。
图6所示的移动管理节点的工作方式如图3所示的实施例相同，此处不作赘述。图6所示的移动管理节点，通过判断UE的数据网关是否能够作为S-GW为UE提供服务，从而选择能为UE提供S-GW服务的UE的数据网关来作为新侧S-GW，即选择合建网关作为新侧S-GW，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。
图7示出了本发明实施例提供的一种服务网关的结构框图，该服务网关可以位于GERAN、UTRAN或者E-UTRAN等通信系统中，用于执行图4所示的方法。
参照图7，该服务网关，包括：
第一接收单元71，用于接收旧侧移动管理节点发送的用户设备UE的数据网关的网络协议IP地址；
第一发送单元72，用于根据所述数据网关的IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务；
第二接收单元73，用于接收所述数据网关的响应消息；
第二发送单元74，用于当所述数据网关的响应消息包括所述数据网关的IP地址和资源标识，将所述数据网关的IP地址和资源标识发送给新侧移动管理节点，以使所述新侧移动管理节点选择所述数据网关为新侧S-GW。
可选的，所述第二发送单元74还用于，当所述响应消息不包括所述数据网关的IP地址和资源标识，将所述S-GW的IP地址和资源标识发送给所述新侧移动管理节点，以使所述新侧移动管理节点选择所述S-GW为新侧S-GW。
图7所示的服务网关的工作方式如图4所示的实施例相同，此处不作赘述。图7所示的实施例提供的服务网关，通过判断UE的数据网关是否能够作为S-GW为UE提供服务，从而选择能为UE提供S-GW服务的UE的数据网关来作为新侧S-GW，即选择合建网关作为新侧S-GW，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。进一步的，通过先选择临时的S-GW，再判断数据网关能否作为S-GW为UE提供服务，可以在数据网关不能作为S-GW为UE提供服务时，直接选用临时的S-GW作为新侧S-GW，简化了信令流程，避免了重新去DNS系统获取新的S-GW来作为新侧S-GW。
图8示出了本发明实施例提供的一种数据网关的结构框图，该数据网关网关可以位于GERAN、UTRAN或者E-UTRAN等通信系统中，用于执行图5所示的方法。该数据网关可以是P-GW或者是合建的GGSN/P-GW。
参照图8，该数据网关，包括：
接收单元81，用于接收判断请求，所述判断请求携带用户设备UE的新侧位置区域标识；
判断单元82，用于根据所述新侧位置区域标识，判断所述数据网关是否能够作为S-GW为所述UE提供服务；
发送单元83，用于当所述数据网关能够作为S-GW为所述UE提供服务时，发送包括所述数据网关的IP地址和资源标识的响应消息。
可选的，发送单元83还用于当所述数据网关不能够作为S-GW为所述UE提供服务时，发送指示所述数据网关不能够作为S-GW为所述UE提供服务的响应消息。
图8所示实施例的数据网关的工作机制和图5所示实施例的获取服务网关的方法的工作机制相同，此处不作赘述。图8所示实施例的数据网关通过判断自身是否能够作为S-GW为UE提供服务，从而选择能为UE提供S-GW服务的UE的数据网关来作为新侧S-GW，即选择合建网关作为新侧S-GW，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。
本发明一实施例还提供一种获取服务网关的系统，如图9所示，包括移动管理节点91和DNS服务器92。其中，移动管理节点91为图2所示的移动管理节点。图9所示系统的工作方式和图1所示的方法相同，此处不作赘述。该系统通过接入信息查询UE的数据网关或者旧侧移动管理节点的主机名，并通过主机名来选择与UE的数据网关或者UE的旧侧移动管理节点在地理拓扑上最近的服务网关作为新侧服务网关，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。
本发明一实施例又提供一种获取服务网关的系统，如图10所示，包括移动管理节点1001和数据网关1002。其中，移动管理节点1001为图6所示的移动管理节点，数据网关1002为图8所示的数据网关。图10所示系统的工作方式和图3所示的方法相同，此处不作赘述。该系统通过判断UE的数据网关是否能够作为S-GW为UE提供服务，从而选择能为UE提供S-GW服务的UE的数据网关来作为新侧S-GW，即选择合建网关作为新侧S-GW，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。
本发明一实施例再提供一种获取服务网关的系统，如图11所示，包括服务网关1101和数据网关1102。其中，服务网关1101为图7所示的服务网关，数据网关1102为图8所示的数据网关。图11所示的系统的工作方式和图4所示的方法相同，此处不做赘述。该系统通过判断UE的数据网关是否能够作为S-GW为UE提供服务，从而选择能为UE提供S-GW服务的UE的数据网关来作为新侧S-GW，即选择合建网关作为新侧S-GW，能够减少由于选择较远地理拓扑距离的服务网关作为新侧服务网关而导致的用户业务数据传输时延的增加。进一步的，通过先选择临时的S-GW，再判断数据网关能否作为S-GW为UE提供服务，可以在数据网关不能作为S-GW为UE提供服务时，直接选用临时的S-GW作为新侧S-GW，简化了信令流程，避免了重新去DNS系统获取新的S-GW来作为新侧S-GW。
本领域普通技术人员可以理解：附图只是一个实施例的示意图，附图中的模块或流程并不一定是实施本发明所必须的。
本领域普通技术人员可以理解：实施例中的装置中的模块可以按照实施例描述分布于实施例的装置中，也可以进行相应变化位于不同于本实施例的一个或多个装置中。上述实施例的模块可以合并为一个模块，也可以进一步拆分成多个子模块。
本领域普通技术人员可以理解：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。
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明实施例技术方案的精神和范围。

Claims (23)

  1. 一种获取服务网关S-GW的方法，当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，其特征在于，包括：
    所述新侧移动管理节点根据所述UE的接入信息向域名系统DNS服务器发送域名解析请求；其中，所述接入信息包括所述UE的接入点名称APN或者所述UE的旧侧位置区域标识；
    所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的设备的主机名；
    所述新侧移动管理节点获取新侧可用S-GW的主机名；
    所述新侧移动管理节点根据所述设备的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述设备在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。
  2. 如权利要求1所述的方法，其特征在于，
    所述接入信息包括所述UE的APN；
    所述新侧移动管理节点根据所述UE的接入信息向DNS服务器发送域名解析请求，包括：所述新侧移动管理节点向所述DNS服务器发送所述域名解析请求，所述域名解析请求包括根据所述APN组成的域名；
    所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的设备的主机名，包括：所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的数据网关的主机名。
  3. 如权利要求1所述的方法，其特征在于，
    所述接入信息包括所述UE的旧侧位置区域标识；
    所述新侧移动管理节点根据所述UE的接入信息向DNS服务器发送域名解析请求，包括：所述新侧移动管理节点向所述DNS服务器发送所述域名解析请求，所述域名解析请求包括根据所述旧侧位置区域标识组成的所述旧侧移动管理节点的域名；
    所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的设备的主机名，包括：所述新侧移动管理节点接收所述DNS服务器根据所述域名解析请求返回的所述旧侧移动管理节点的主机名。
  4. 一种获取服务网关S-GW的方法，当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，其特征在于，包括：
    所述新侧移动管理节点接收所述旧侧移动管理节点发送的所述UE的数据网关的网络协议IP地址；
    所述新侧移动管理节点根据所述IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务；
    所述新侧移动管理节点接收所述数据网关的响应消息；
    当所述响应消息包括 所述数据网关的IP地址和资源标识时，所述新侧移动管理节点选择所述数据网关作为新侧S-GW。
  5. 如权利要求4所述的方法，其特征在于，还包括：
    当所述响应消息不包括所述数据网关的IP地址和资源标识时，所述新侧移动管理节点从域名系统DNS服务器中获取新侧S-GW。
  6. 一种获取服务网关S-GW的方法，当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，其特征在于，包括：
    所述S-GW接收所述旧侧移动管理节点发送的所述UE的数据网关的网络协议IP地址；其中，所述S-GW为所述新侧移动管理节点从域名系统DNS服务器中获取的；
    所述S-GW根据所述数据网关的IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务；
    所述S-GW接收所述数据网关的响应消息；
    当所述数据网关的响应消息包括所述数据网关的IP地址和资源标识，所述S-GW将所述数据网关的IP地址和资源标识发送给所述新侧移动管理节点，以使所述新侧移动管理节点选择所述数据网关为新侧S-GW。
  7. 如权利要求6所述的方法，其特征在于，还包括：
    当所述响应消息不包括所述数据网关的IP地址和资源标识，所述S-GW将自身的IP地址和资源标识发送给所述新侧移动管理节点，以使所述新侧移动管理节点选择所述S-GW为新侧S-GW。
  8. 一种获取服务网关S-GW的方法，当用户设备UE从旧侧移动管理节点切换至新侧移动管理节点时，其特征在于，包括：
    数据网关接收判断请求，所述判断请求携带用户设备UE的新侧位置区域标识；
    所述数据网关根据所述新侧位置区域标识，判断自身是否能够作为S-GW为所述UE提供服务；
    当所述数据网关能够作为S-GW为所述UE提供服务时，所述数据网关发送包括所述数据网关的IP地址和资源标识的响应消息，指示选择所述数据网关作为所述UE的新侧S-GW。
  9. 如权利要求8所述的方法，其特征在于，还包括：
    当所述数据网关不能够作为S-GW为所述UE提供服务时，所述数据网关发送指示所述PDN网关不能够作为S-GW为所述UE提供服务的响应消息。
  10. 一种移动管理节点，其特征在于，包括：
    发送单元，用于根据用户设备UE的接入信息向域名系统DNS服务器发送域名解析请求；其中，所述接入信息包括所述UE的接入点名称APN或者所述UE的旧侧位置区域标识；
    接收单元，用于接收所述DNS服务器根据所述域名解析请求返回的设备的主机名；
    获取单元，用于获取新侧可用服务网关S-GW的主机名；
    选择单元，用于根据所述设备的主机名中表示地理拓扑关系的部分和所述新侧可用S-GW的主机名中表示地理拓扑关系的部分，选择与所述设备在地理拓扑上最接近的所述新侧可用S-GW作为新侧S-GW。
  11. 如权利要求10所述的移动管理节点，其特征在于，
    所述接入信息包括所述UE的APN；
    所述发送单元，具体用于向所述DNS服务器发送所述域名解析请求，所述域名解析请求包括根据所述APN组成的域名；
    所述接收单元，具体用于接收所述DNS服务器根据所述域名解析请求返回的数据网关的主机名。
  12. 如权利要求10所述的移动管理节点，其特征在于，
    所述接入信息包括所述UE的旧侧位置区域标识；
    所述发送单元，具体用于向所述DNS服务器发送所述域名解析请求，所述域名解析请求包括根据所述旧侧位置区域标识组成的旧侧移动管理节点的域名；
    所述接收单元，具体用于接收所述DNS服务器根据所述域名解析请求返回的所述旧侧移动管理节点的主机名。
  13. 如权利要求10~12任一项所述的移动管理节点，其特征在于，所述移动管理节点为服务通用分组无线业务支持节点SGSN或者移动管理实体MME。
  14. 一种移动管理节点，其特征在于，包括：
    第一接收单元，用于接收旧侧移动管理节点发送的用户设备UE的数据网关的网络协议IP地址；
    发送单元，用于根据所述IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为服务网关S-GW为所述UE提供服务；
    第二接收单元，用于接收所述数据网关的响应消息；
    选择单元，用于当所述响应消息包括 所述数据网关的IP地址和资源标识时，选择所述数据网关作为新侧S-GW。
  15. 如权利要求14所述的移动管理节点，其特征在于，所述选择单元还用于，当所述响应消息不包括所述数据网关的IP地址和资源标识时，从域名系统DNS服务器中获取新侧S-GW。
  16. 如权利要求14或15所述的节点，其特征在于，所述移动管理节点为服务通用分组无线业务支持节点SGSN或者移动管理实体MME。
  17. 一种服务网关S-GW，其特征在于，包括：
    第一接收单元，用于接收旧侧移动管理节点发送的用户设备UE的数据网关的网络协议IP地址；
    第一发送单元，用于根据所述数据网关的IP地址向所述数据网关发送判断请求，所述判断请求携带所述UE的新侧位置区域标识，以使所述数据网关根据所述新侧位置区域标识判断自身是否能够作为S-GW为所述UE提供服务；
    第二接收单元，用于接收所述数据网关的响应消息；
    第二发送单元，用于当所述数据网关的响应消息包括所述数据网关的IP地址和资源标识，将所述数据网关的IP地址和资源标识发送给新侧移动管理节点，以使所述新侧移动管理节点选择所述数据网关为新侧S-GW。
  18. 如权利要求17所述的S-GW，其特征在于，所述第二发送单元还用于，当所述响应消息不包括所述数据网关的IP地址和资源标识，将所述S-GW的IP地址和资源标识发送给所述新侧移动管理节点，以使所述新侧移动管理节点选择所述S-GW为新侧S-GW。
  19. 一种数据网关，其特征在于，包括：
    接收单元，用于接收判断请求，所述判断请求携带用户设备UE的新侧位置区域标识；
    判断单元，用于根据所述新侧位置区域标识，判断所述数据网关是否能够作为S-GW为所述UE提供服务；
    发送单元，用于当所述数据网关能够作为S-GW为所述UE提供服务时，发送包括所述数据网关的IP地址和资源标识的响应消息。
  20. 如权利要求19所述的数据网关，其特征在于，所述发送单元还用于当所述数据网关不能够作为S-GW为所述UE提供服务时，发送指示所述数据网关不能够作为S-GW为所述UE提供服务的响应消息。
  21. 一种获取服务网关S-GW的系统，其特征在于，包括如权利要求10~13任一项所述的移动管理节点和域名系统DNS服务器。
  22. 一种获取服务网关S-GW的系统，其特征在于，包括如权利要求14~16任一项所述的移动管理节点和如权利要求19或20所述的数据网关。
  23. 一种获取服务网关S-GW的系统，其特征在于，包括如权利要求17或18所述的服务网关S-GW和如权利要求19或20所述的数据网关。
PCT/CN2012/076871 2012-06-13 2012-06-13 获取服务网关的方法及移动管理节点、数据网关及系统 WO2013185311A1 (zh)

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