WO2014183715A1 - 一种网关更新信息通知方法及控制器 - Google Patents

一种网关更新信息通知方法及控制器 Download PDF

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Publication number
WO2014183715A1
WO2014183715A1 PCT/CN2014/079192 CN2014079192W WO2014183715A1 WO 2014183715 A1 WO2014183715 A1 WO 2014183715A1 CN 2014079192 W CN2014079192 W CN 2014079192W WO 2014183715 A1 WO2014183715 A1 WO 2014183715A1
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WO
WIPO (PCT)
Prior art keywords
gateway
user plane
controller
information
new
Prior art date
Application number
PCT/CN2014/079192
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English (en)
French (fr)
Inventor
毕以峰
王静
田甜
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP14797981.9A priority Critical patent/EP3073789B1/en
Priority to US15/037,812 priority patent/US10015712B2/en
Publication of WO2014183715A1 publication Critical patent/WO2014183715A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/10—Reselecting an access point controller
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • H04W36/125—Reselecting a serving backbone network switching or routing node involving different types of service backbones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • the invention relates to the field of communications. More particularly, it relates to a gateway update information notification method and controller. Background technique
  • SDN Software Defined Network
  • EPS Evolved Packet System
  • GPRS General Packet Radio Service
  • the network is a third generation mobile communication network defined by 3GPP.
  • the architecture of the EPS network implemented by SDN is shown in Figure 1, where the UE is a communication terminal.
  • the EUT AN (Evolved Universal Terrestrial Radio Access Network) is a radio access network, which is internally composed of an eNB (evolved NodeB, evolved NodeB base station).
  • the core network part that is, the software-defined EPC (evolved packet core, the core network part of the EPS) network, is composed of MME (Mobility Management Entity, Mobile Management Unit), SGW (Serving Gateway), and PGW (Packet Data Network Gateway) and other devices. All UGWs (Unified Gateways) are common gateway devices whose roles are controlled by the control signaling of the SDN Controller (SDN Controller, Controller for short). In the figure, both the SGW and the PGW are played by the UGW in which they are located according to the controller's instructions.
  • SDN Controller SDN Controller
  • the UE is a communication terminal.
  • the UTRAN Universal Terrestrial Radio Access Network
  • NB NodeB, Base Station
  • RNC Adio Network Controller
  • the core network part is also the core network part of the EPS EPC, but the mobile management function is responsible for the SGSN's control plane function S4-SGSN (Serving GPRS Support Node, GPRS service support node), that is, the SGSN supporting the S4 interface is responsible.
  • S4-SGSN Server GPRS Support Node, GPRS service support node
  • the SGW is an SGW that supports the S12 interface with the RNC
  • the PGW is the same as the PGW in FIG. Both the SGW and the PGW are controlled by the UGW controlled by the controller.
  • FIG. 1 The problem of implementing EPS/GPRS network with SDN is illustrated by Figure 1 below.
  • the control plane and the user plane of the SGW are unified, and the SGW is selected by the MME according to the location information of the UE, the subscription information, and the like.
  • the control plane and the user plane of the SGW are separated, the control plane of the SGW actually has a controller to execute, and the SGW user plane is executed by the general gateway UGW according to the instructions of the controller, so
  • the MME can only select the controller, and the decision to select which UGW to perform the function of the SGW user plane requires the controller to complete.
  • UGW is in a pool, or a management domain, and UGW is undertaken by a general switch device or a virtual switch.
  • the controller selects UGW, it needs to comprehensively consider the location information and subscription information of the UE.
  • the MME can initiate the SGW relocation operation to solve the forwarding problem of the user data stream, and ensure the continuity of the service and the integrity of the data.
  • the EPS/GPRS system is The MME/S4-SGSN cannot sense the change of the SGW. Therefore, because the SGW changes, the front-end network element cannot know the information of the new SGW, resulting in the user interface link being broken, the user service cannot be continuous, and the user data is interrupted.
  • the controller reselects the PGW, the MME will not be able to know the user plane information of the new PGW, which will cause subsequent switching operations to go wrong, resulting in user data interruption.
  • an object of the embodiments of the present invention is to provide an information notification method and system, which can solve at least the above problems in the prior art.
  • the embodiment of the present invention provides a gateway update information notification method, including: the controller performs gateway reselection to obtain a new gateway; the controller sends the user plane information of the new gateway to the corresponding front end network element;
  • the user plane information includes user plane address information of the new gateway.
  • the gateway includes at least one of the following: a service gateway, a packet data network gateway.
  • the controller sends the user plane information of the new gateway to the corresponding front-end network element, including:
  • the gateway includes a serving gateway
  • the front-end network element sends the user plane information of the new serving gateway to the wireless communication with the original serving gateway by using an S1 interface application protocol message or an Iu message. Access Network.
  • the front-end network element sends the user plane information of the new serving gateway to the wireless network control in the radio access network that communicates with the original serving gateway by using an S1 interface application protocol message or an Iu message. Or evolved NodeB base station.
  • the method before the front-end network element sends the user plane information of the new serving gateway to the radio access network that communicates with the original serving gateway, the method further includes: the controller is to communicate with the original serving gateway.
  • the user plane information of the packet data network gateway is sent to the new service gateway.
  • the front end network element is a mobility management unit or a GPRS service support node supporting an S4 interface.
  • the method further includes: the controller reselecting the GPRS service support node; and transmitting the user plane information including the user plane address information of the new GPRS service support node to the original GPRS service.
  • a wireless network controller that supports node communication.
  • the user plane information further includes a tunnel endpoint identifier.
  • the embodiment of the present invention further provides a gateway update information notification controller, including a reselection module and a sending module, where
  • the reselection module is configured to reselect a gateway to obtain a new gateway
  • the sending module is configured to send user plane information of the gateway reselected by the reselection module to the corresponding front end network element; the user plane information includes user plane address information of the new serving gateway.
  • the sending module is configured to send, to the front-end network element, a GTP protocol advertisement message or a GTP protocol update bearer request message that carries user plane information of the new gateway;
  • a GTP protocol update bearer request carrying an update indication.
  • the gateway selected by the reselection module includes at least one of the following: a service gateway, a packet data network gateway.
  • the reselection module is further configured to reselect a GPRS service support node; the sending module is further configured to: the user plane address of the GPRS service support node that is reselected by the reselection module The user plane information of the information is sent to the radio network controller in communication with the original GPRS service support node.
  • the invention sends the user plane information of the reselected gateway to the front end network element after the controller reselects the gateway. It ensures that the front-end network element can know the user plane information of the newly selected gateway, thus ensuring the continuity of user data transmission.
  • Figure 1 is an architectural diagram of an EPS network implemented by SDN
  • FIG. 2 is a structural diagram of a GPRS system connected to an EPS network implemented by using SDN;
  • FIG. 3 is a flowchart of a method according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a method according to Embodiment 4 of the present invention.
  • FIG. 7 is a schematic flowchart 1 of a method according to Embodiment 5 of the present invention.
  • FIG. 8 is a second schematic flowchart of a method according to Embodiment 5 of the present invention.
  • FIG. 9 is a schematic flowchart 1 of a method according to Embodiment 6 of the present invention.
  • 10 is a second schematic flowchart of a method according to Embodiment 6 of the present invention
  • 11 is a schematic flowchart of advertising the information of a new PGW to an MME according to Embodiment 7.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the controller can re-select the gateway to enable the user to continue the service.
  • the method provided in this embodiment is: After the controller reselects the gateway, the controller sends the user plane information of the new gateway.
  • the user plane information includes the user plane address information of the new gateway, and the front end network element is a mobility management unit MME or a GPRS service support node S4-SGSN supporting the S4 interface.
  • the gateway that the controller reselects may be the service gateway SGW or the packet data network gateway PGW, or there may be cases where both gateways are reselected.
  • the gateway address changes are but not limited to the following:
  • the terminal UE moves.
  • the controller determines the location information of the terminal UE, such as TAI (Tracking Area Identity) information or address location information.
  • the new UGW is selected as the user plane function of the service gateway. For example, if the terminal UE moves, the handover of the eNB is changed or the tracking area update (TAU) is performed, the eNB reports the cell information to the MME, and further reports to the controller, and the controller According to the policy (including the local policy and the subscription policy of the UE, etc.), it is decided to select a new UGW as the service gateway.
  • TAU tracking area update
  • the controller according to the information reported by the network management system, or the information about the network operation detected by the controller, knows that the UGW currently serving the terminal UE is faulty, and the controller therefore selects a new UGW to perform the function of the service gateway user plane.
  • the controller detects that the UGW load currently serving the UE is overloaded, and there are other light-loaded UGWs, so the controller decides to replace the UGW to execute the service gateway.
  • User face features For example, the controller detects that the UGW load currently serving the UE is overloaded, and there are other light-loaded UGWs, so the controller decides to replace the UGW to execute the service gateway.
  • the UGW of the entire network is in an excessively light load state, and all operations will cause waste. Therefore, it is necessary to turn off several UGWs, and only use a few UGWs. Therefore, the UGW of the UE performing the serving gateway function may be forcibly closed, and the function of the serving gateway needs to be transferred to the reserved UGW, resulting in replacement of the UGW.
  • the UGW may be implemented with a virtual switch.
  • the virtual switch is a virtual device in a virtual environment.
  • the virtual device may also change the external communication IP for various reasons, resulting in a logically equivalent service gateway replacement.
  • the migration of a virtual machine can ensure that the external IP address of the virtual machine is unchanged. This scenario does not cause the UGW to be replaced. It does not fall within the scope of the invention.
  • the controller selected the new UGW as the serving gateway, that is, the external communication IP address of the serving gateway changed.
  • the controller may send the bearer context information of the terminal UE to the newly selected UGW by sending a flow table.
  • the bearer context information of the terminal UE includes the GTP (GPRS tunnel protocol) tunnel information (for example, the TEID of the GTP tunnel, the endpoint network element address of the GTP tunnel, the port number, etc.), the charging policy information, and the QoS. Strategy information, etc.
  • GTP GPRS tunnel protocol
  • the service gateway is taken as an example, and the PGW will be re-elected for the same reason.
  • the controller Regardless of whether the controller reselects the SGW or the PGW, the controller sends the user plane information of the new gateway to the corresponding front-end network element; the user plane information includes the user plane address information of the new gateway.
  • the controller can send the user plane information of the new gateway to the front-end network element in one of the following three ways:
  • the controller sends an advertisement message and carries user plane information of the reselected gateway
  • For the front-end network element where is the MME
  • B the controller sends an update bearer request message and carries the user plane information of the reselected gateway to the MME
  • C The controller sends an update bearer request message and an indication to the The MME, the cause value of the indication is that the gateway is replaced.
  • the bearer response information carrying the user plane information of the new gateway is sent to the front-end network element according to the feedback of the front-end network element to the update bearer request message.
  • the controller sends the user plane information of the new gateway to the corresponding front-end network element, that is, the front-end network element receives the new service gateway sent by the controller to it.
  • the user plane information of the new serving gateway is also sent to the radio access network that communicates with the original serving gateway, where it is generally sent to the eNB.
  • the controller sends the user plane information of the new gateway to the front-end network element in the following three manners.
  • the controller sends an advertisement message and carries the user plane information of the reselected gateway to the front-end network element, where the GPRS service support node S4-SGSN supporting the S4 interface is generally used; Updating the bearer request message and carrying the user plane information of the reselected gateway to the S4-SGSN; C.
  • the controller sends an update bearer request message and an indication to the S4-SGSN, where the cause value of the indication is that the gateway is replaced.
  • the bearer response information carrying the user plane information of the new gateway is sent to the front-end network element according to the feedback of the front-end network element to the update bearer request message.
  • the front-end network element When the reselected gateway is the serving gateway SGW, the front-end network element sends the user plane information of the new serving gateway to the original service after receiving the user plane information of the new serving gateway sent by the controller.
  • the radio access network for gateway communication which is generally sent to the RNC.
  • the method further includes: the controller sending the user plane information of the packet data network gateway PGW to the re-service Gateway SGW. This step is to ensure that after the radio access network receives the user plane information of the serving gateway, the user can send the uplink data to the heavy
  • the selected service gateway is sent to the packet data network gateway to realize the uplink data transmission of the user.
  • the controller directly controls the UGW to perform the control plane function of the SGSN and the GGSN (Gateway GPRS Support Node), and the controller and the RNC directly
  • the interface performs control plane signaling interaction, and the RNC and SGSN interfaces are used for user plane data transmission.
  • the controller may reselect the SGSN.
  • the reason for the reselection is the same as above.
  • the controller will reselect the user plane of the GPRS service support node SGSN.
  • the information is sent to a radio access network that communicates with the original GPRS service support node SGSN.
  • the method of sending can also be by adding a message or enhancing an existing message. You can also use the three methods provided above to send.
  • the user plane information includes user plane address information.
  • the user plane information further includes the tunnel endpoint identifier TEID of the reselected serving gateway sent to the wireless access communication with the original serving gateway. network.
  • the controller also sends the tunnel endpoint identifier TEID of the reselected packet data network gateway PGW to the mobility management unit MME or the GPRS service support node supporting the S4 interface. S4-SGSN.
  • the embodiment further provides a gateway update information notification controller, where the controller includes a reselection module and a sending module; the reselection module is used to reselect the gateway; and the sending module is configured to The user plane information of the selected gateway is sent to the corresponding front-end network element; the user plane information includes user plane address information of the new serving gateway.
  • the controller includes a reselection module and a sending module; the reselection module is used to reselect the gateway; and the sending module is configured to The user plane information of the selected gateway is sent to the corresponding front-end network element; the user plane information includes user plane address information of the new serving gateway.
  • the gateway reselected by the reselection module includes at least one of a serving gateway and a packet data network gateway.
  • the reselection module is further configured to reselect the GPRS service support node; the sending module is further configured to send the user plane information of the GPRS service support node reselected by the reselection module to the wireless communication with the original GPRS service support node. Access Network.
  • the reselection module can be implemented by hardware such as a CPU or a DSP; the sending module can be implemented by hardware such as a CPU or a DSP.
  • Embodiment 2 The notification method of the information provided by the present invention will be described below with more specific embodiments.
  • Embodiment 2
  • FIG. 3 shows how the user plane information of the gateway and the network element in the system is transmitted when the controller selects a new UGW as the serving gateway SGW in the scenario where the terminal UE accesses the EPS core network from the EUTRAN/UTRAN.
  • Step S301 The controller selects a new unified gateway UGW as the serving gateway SGW for the reason described in the first embodiment
  • Step S302 The controller sends the user plane information of the packet data network gateway PGW to the new serving gateway SGW, or the reselected serving gateway SGW, by sending the flow table; the user plane information includes the user plane address information, and the specific It can be the upstream user plane address information.
  • Step S303 The controller notifies the front-end network element of the user plane information of the new serving gateway SGW, where the terminal UE accesses the EPS core network from the EUT AN, specifically to the mobility management unit MME; and the terminal UE accesses from the UTRAN.
  • the EPS core network specifically, it is sent to the GPRS service support node S4-SGSN supporting the S4 interface.
  • the new serving gateway SGW is completely ready to send uplink data. Since the data stream is not sent from the eNB/RNC, there is no data temporarily on the serving gateway SGW; the PGW is ready to accept the uplink data and downlink. The data is still sent from the PGW to the old service gateway SGW through the old flow table.
  • Step S304 After learning the user plane information of the new serving gateway SGW, the front-end network element feeds back information to the controller, indicating that the information has been received.
  • Step S305 After receiving the response message of the front-end network element, the controller updates the downlink user plane information of the eNB/RNC to the new serving gateway SGW by updating the flow table. And update the information of the new service gateway SGW to the PGW by updating the flow table. This step can also be This is performed in step S302. At the same time, the controller can also delete the information about the old service gateway SGW on the PGW, and also delete the unused flow table on the old service gateway SGW. After the above update flow table, the new service gateway SGW is fully ready to send downlink data.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • Figure 4 shows the GPRS system for control plane signaling interaction between the controller and the RNC direct interface in the SDN scenario.
  • the controller selects a new UGW as the SGSN, how to transmit the user plane of the gateway and the network element in the system. information.
  • Step S401 The controller selects a new unified gateway UGW as the SGSN for the reason described in the first embodiment
  • Step S402 The controller sends the user plane information of the uplink gateway that communicates with the SGSN to the new SGSN by sending the flow table.
  • the user plane information includes the user plane address information, which may be the uplink user plane address information.
  • Step S403 The controller notifies the radio access network of the user plane information of the new SGSN, specifically, to the radio network controller RNC. After the above-mentioned outgoing flow table, the new SGSN is completely ready to send uplink data, and the data stream is not sent from the RNC, so there is no data temporarily on the SGSN;
  • Step S404 After learning the user plane information of the new SGSN, the NC feeds back information to the controller.
  • Step S405 After receiving the response message of the RNC, the controller updates the downlink user information of the RNC to the new SGSN by updating the flow table. This step may also be performed in step S402. At the same time, the controller can also delete the information about the old SGSN on the PGW, and also delete the unused flow table on the old SGSN. After the above update of the flow table, the new SGSN is fully ready to send downstream data.
  • controller in this embodiment only reselects the SGSN, for a more complicated system, the controller may exist to reselect the SGW and/or the PGW, and reselect the SGSN. Condition.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • Figure 5 shows how the user plane information of the eNB's new serving gateway SGW is advertised by the MME when the terminal selects a new UGW as the serving gateway SGW in the scenario where the terminal UE accesses the EPS core network from the EUTRAN.
  • Step S501 The controller selects a new UGW as the serving gateway SGW, and the external communication IP address of the serving gateway SGW changes.
  • the controller may use the TEID assigned to the original serving gateway SGW for the newly selected serving gateway SGW, or reassign the TEID. If a new TEID is assigned, the TEID needs to be updated to the PGW.
  • the controller controls a group of UGWs, and several of them start to play the new UE according to the instructions of the controller.
  • Service Gateway SGW the role of the old Serving Gateway SGW and PGW. Therefore, when the controller sends the flow table or updates the flow table, it should send/update to the corresponding UGW.
  • Step S502 The controller sends the user plane information of the new serving gateway SGW to the MME by using the advertisement message through the S11 interface.
  • the user plane information comprises the SGW service gateway user plane information, IP address (IPv4 and / or IPv6) for external communication, and the TEID (if reassigned TEID) 0
  • Step S503a The MME responds to the notification response message to the controller. This step can also occur after step S505, i.e., S503b.
  • Step S504 The MME sends the user plane information with the new serving gateway SGW to the radio access network, specifically the eNB in the radio access network, through the advertisement message of the S1-MME interface.
  • Step S505 The eNB responds to the MME with an advertisement response message.
  • Step S506 After receiving the response message of the MME response, the controller updates the flow table to the new serving gateway SGW and/or PGW. When the controller sends the flow table or updates the flow table, it should send/update to the corresponding UGW.
  • the advertised message and the advertised response message in the step S502-S505 are the newly defined GTP message and the S1-AP (SI-Application Protocol) message on the S11 interface and the S1-MME interface.
  • the specific message interaction mode and format may not be as shown in the figure. For example, it may be interactive information of two handshakes.
  • the basic operation mechanism is basically the same as the foregoing embodiment, as shown in FIG. 6, except that the usage scenario is changed to the UE accessing the EPC under the SDN through the UTRAN system.
  • the network element and interface and signaling have been changed accordingly.
  • the MME is changed to the S4-SGSN, and the controller communicates with the S4-SGSN through the S4 interface.
  • the S4-SGSN communicates with the wireless network controller through the Iu interface and the wireless access network.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • the controller selects a new UGW as the serving gateway SGW, and another method is used to notify the eNB of the new serving gateway SGW through the MME. User face information.
  • Step S701 Same step S501.
  • Step S702 The controller sends an Update Bearer Request message.
  • the user plane information carrying the new serving gateway SGW is sent to the MME.
  • the user plane information of the serving gateway SGW is an extension field in the message; wherein the user plane information of the serving gateway SGW includes user plane information, an external communication IP address (IPv4 and/or IPv6), and a TEID (if the TEID is reassigned) ) .
  • Step S703a The MME responds to the controller with an update bearer response message. This step can also occur after step S705, S703b.
  • Step S704 The MME initiates a serving gateway SGW relocation operation procedure in the existing protocol, and sends information of the new serving gateway SGW to the eNB. MME sends service gateway SGW relocation pass The message is sent to the eNB, carrying the user plane information of the new serving gateway SGW.
  • Step S705 The eNB responds to the serving gateway SGW relocation notification response message to the MME.
  • Step S707 Same as step S307.
  • the message in step S702, S703a, and S703b may also be a Delete Bearer Request/Response message and other GTP message pairs, but is preferred.
  • the basic operation mechanism is basically the same as the foregoing embodiment, as shown in FIG. 8, except that the usage scenario is changed to the UE accessing the EPC under the SDN through the UTRAN system.
  • the network element and interface and signaling have been changed accordingly.
  • the MME is changed to the S4-SGSN, and the controller communicates with the S4-SGSN through the S4 interface.
  • the S4-SGSN communicates with the wireless network controller through the Iu interface and the wireless access network.
  • the controller selects a new UGW as the serving gateway SGW, and another method is used to notify the eNB of the new serving gateway SGW through the MME. User face information.
  • the basic operation mechanism of this embodiment is basically the same as that of the second embodiment and the third embodiment, except that the user plane information of the newly selected serving gateway SGW is delivered through another enhanced GTP message and S1-AP message.
  • Step S901 Same as step S701.
  • Step S902 The controller sends an Update Bearer Request message to the MME.
  • the message carries an indication that the MME needs to initiate an operation of the serving gateway SGW relocation.
  • the indication may be an extension of the cause value in the existing message or a newly added cell.
  • Step S903 The MME responds to the controller with an update bearer response message.
  • Step S904 The MME initiates a service gateway SGW update operation procedure; the MME sends a controller to the controller. Controller GTP message sent modify bearer request message (Modify Bearer Request) 0 Step S905: respond to the Controller Modify Bearer Response message to the MME, the message carries the user plane information of the new serving gateway SGW; wherein the user plane information include a serving gateway SGW User plane information, IP address of external communication (IPv4 and/or IPv6), and TEID (if TEID is reassigned);
  • Step S906 The MME sends a serving gateway SGW relocation notification message to the eNB, and carries the user plane information of the new serving gateway SGW.
  • Step S907 The eNB responds to the serving gateway SGW relocation notification response message to the MME.
  • Step S909 The controller responds to the MME with a modify bearer response message.
  • Step S910 Same as step S606.
  • the message in step S902 may be deleted from the Delete Bearer Request/Response message and other GTP message pairs, and the messages in steps S904 and S905 are In addition to modifying the bearer request/response message, it is also possible to create a Create Bearer Request/Response message pair and other GTP message pairs. However, as a preference, it is recommended to use the update bearer request/response message shown in the flowchart, and to modify the bearer request/response message.
  • the basic operation mechanism is basically the same as the foregoing embodiment, as shown in FIG. 10, except that the usage scenario is changed to the UE accessing the EPC under the SDN through the UTRAN system.
  • the network element and interface and signaling have been changed accordingly.
  • the MME is changed to the S4-SGSN, and the controller communicates with the S4-SGSN through the S4 interface.
  • the S4-SGSN communicates with the wireless network controller through the Iu interface and the wireless access network.
  • Example 7 After the UGW that performs the PGW function is reselected, and the user plane address of the PGW is changed, the controller also informs the MME or the S4-SGSN of the information of the PGW to prevent subsequent switching operations from occurring.
  • the manner in which the information is transmitted can also be increased by adding a message or enhancing an existing message as described in the above embodiments 4 to 6.
  • Figure 11 shows how the new PGW information is advertised to the MME through the controller in the scenario where the terminal UE accesses the EPS core network from the EUTRAN.
  • Step S1101 The controller selects a new UGW as the PGW, and the external communication IP address of the PGW changes.
  • Step S1102 The controller sends the user plane information of the new PGW to the MME by using the advertisement message through the S11 interface.
  • PGW wherein the user plane information includes IP address (IPv4 and / or IPv6) the user plane information, external communication, and the TEID (if reassigned TEID) 0
  • Step S1103 The MME responds to the notification response message to the controller. This step is optional.
  • the basic steps are the same as the foregoing embodiment, except that in the foregoing step S1102, the controller sends the update bearer request message and carries the user plane information of the PGW to the MMEo by using the method described in the fifth embodiment.
  • the basic operation mechanism is basically the same as that of the foregoing embodiment, and the usage scenario is changed to the UE accessing the EPC under the SDN through the UTRAN system.
  • the network element and interface and signaling have been changed accordingly.
  • the MME is changed to S4-SGSN, and the controller communicates with the S4-SGSN through the S4 interface.
  • modules or steps of the present invention described above can be implemented with general purpose computing devices (including switches, routers, servers, and other network devices, etc.) that can be centralized in a single computing device. Or distributed over a network of computing devices, optionally, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, and In some cases, the steps shown or described may be performed in an order different from that herein, or Each of the integrated circuit modules is fabricated separately, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

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Abstract

一种软件定义网络场景下的网关发生更改时的信息通知的方法和系统：在控制器重新选择网关后，通过控制器将重选的网关的用户面信息发送给对应的前端网元。

Description

一种网关更新信息通知方法及控制器 技术领域
本发明涉及通信领域。 尤其涉及一种网关更新信息通知方法及控制器。 背景技术
软件定义网络（ Software Defined Network, SDN )技术， 可以在控制面 釆用软件编程实现各种复杂的网络应用，例如用 SDN实现 EPS/GPRS网络。 其中， EPS ( Evolved Packet System, 演进的分组系统） 网络是 3GPP ( 3rd Generation Partnership Project, 第三代合作伙伴计划）定义的第四代移动通 信网络， GPRS ( General Packet Radio Service, 通用分组无线服务） 网络是 3GPP定义的第三代移动通信网络。
用 SDN实现 EPS 网络的架构如图 1 所示， 其中， UE为通信终端。
EUT AN ( Evolved Universal Terrestrial Radio Access Network, 演进的通用 移动通信系统陆地无线接入网）为无线接入网，内部由 eNB( evolved NodeB， 演进的 NodeB基站 )组成。核心网部分， 即软件定义的 EPC ( evolved Packet core, 演进的分组核心网， 即 EPS的核心网部分）网络， 由 MME ( Mobility Management Entity, 移动管理单元）、 SGW ( Serving Gateway, 服务网关） 和 PGW ( Packet Data Network Gateway, 分组数据网络网关)和其他设备构 成。 所有的 UGW ( unified Gateway, 统一网关）都是通用的网关设备， 其 角色受控于 SDN控制器（ SDN Controller, 简称 Controller或控制器 ) 的控 制信令。 图中， SGW和 PGW都是由其所在的 UGW根据控制器指示扮演 的。 这些网关角色， 不排除是两个， 或者三个都落在同一个 UGW之上的可 能，如果落在同一个 UGW之上，那么网元和网元之间的接口就变成了内部 接口。 用 SDN实现的 GPRS系统接入到 EPS网络的架构如图 2所示。 其中， UE为通信终端。 UTRAN ( Universal Terrestrial Radio Access Network, 通用 移动通信系统陆地无线接入网）为无线接入网， 内部由 NB ( NodeB, 基站） 和 RNC ( adio Network Controller， 无线网络控制器）组成。 核心网部分还 是 EPS 的核心网部分 EPC， 只是移动管理的功能由 SGSN的控制面功能 S4-SGSN ( Serving GPRS Support Node, GPRS服务支持节点） 负责， 即： 支持 S4接口的 SGSN负责。 SGW是支持与 RNC的 S12接口的 SGW， PGW 同图 1中的 PGW。 SGW和 PGW都是受控于控制器的 UGW扮演的。
下面以图 1来说明用 SDN实现 EPS/GPRS网络存在的问题。 在传统的 EPS系统中， SGW的控制面和用户面合一， SGW是由 MME根据 UE的位 置信息， 签约信息等选择。 但是到了 SDN环境下的系统， SGW的控制面 和用户面分离了， SGW 的控制面实际上有控制器来执行了， SGW用户面 由通用网关 UGW根据控制器的指令来执行其功能的，因此 MME只能够选 择控制器， 而选择哪个 UGW来执行 SGW用户面的功能的决定权是需要控 制器来完成的。 因此 UGW都是在一个池中， 或者是一个管理域中， 而且 UGW是由通用的交换机设备或者是虚拟交换机承担的， 控制器在选择 UGW的时候， 除了需要综合考虑 UE的位置信息、 签约信息等之外， 还要 考虑 UGW 当前的负荷信息， 虚拟交换机的开启状态信息等。 因此， 在用 SDN实现 EPS/GPRS网络的系统中， 就存在一种场景， 即， 不是因 UE的 位置信息或者签约信息改变，而是因为 UGW的负荷状态或者数据中心虚拟 机的开启状态， 导致了 UGW的重选， 从而导致了 SGW的用户面迁移， 进 而导致 SGW的用户面地址改变。
因为传统网络中 SGW是否改变， 是由 MME决定并感知的， 可以由 MME主动发起 SGW重定位的操作， 解决用户数据流的转发问题， 保证了 业务的连续性和数据的完整性。 但是在 SDN场景下的 EPS/GPRS系统， 由 于 MME/S4-SGSN不能感知 SGW的改变， 因此就出现了因为 SGW改变， 前端网元不能获知新的 SGW的信息， 导致用户面链路断链， 用户业务不能 连续和用户数据中断的问题。而当控制器重选 PGW的时候，同样会存 MME 不能获知新的 PGW的用户面信息的情况， 会导致后续的切换操作出错， 从 而导致用户数据中断的问题。
因此， 用 SDN实现 EPS/GPRS网络场景下， 都存在因控制器重选网关 而导致的前端网元不能获知新的网关的信息， 从而导致的用户业务不能连 续和用户数据中断的问题。 发明内容
有鉴于此， 本发明实施例的目的在于提供一种信息通知方法及系统， 能至少解决现有技术存在的上述问题。
本发明实施例提供了一种网关更新信息通知方法， 包括： 控制器进行 网关重选， 获得新的网关； 所述控制器将所述新的网关的用户面信息发送 给对应的前端网元； 其中， 所述用户面信息包括所述新的网关的用户面地 址信息。
在本发明的一种实施例中， 所述网关至少包括以下之一： 服务网关、 分组数据网络网关。
在本发明的一种实施例中， 所述控制器将所述新的网关的用户面信息 发送给对应的前端网元包括：
向所述前端网元发送携带有所述新的网关的用户面信息的 GTP协议通 告消息或 GTP协议更新承载请求消息；
或向所述前端网元发送携带有更新指示的 GTP协议更新承载请求消 息， 所述前端网元根据所述更新指示发送 GTP协议修改承载请求消息给控 制器， 控制器在 GTP协议修改承载响应中将携带有所述新的网关的用户面 信息的承载响应信息给所述前端网元。 在本发明的一种实施例中， 所述网关包括服务网关时， 所述前端网元 将新的服务网关的用户面信息通过 S1接口应用协议消息或者 Iu消息发送给 与原服务网关通信的无线接入网。
在本发明的一种实施例中， 所述前端网元将新的服务网关的用户面信 息通过 S1接口应用协议消息或者 Iu消息发送给与原服务网关通信的无线接 入网中的无线网络控制器或者演进的 NodeB基站。
在本发明的一种实施例中， 在所述前端网元将新的服务网关的用户面 信息发送给与原服务网关通信的无线接入网之前还包括： 控制器将与原服 务网关通信的分组数据网络网关的用户面信息发送给所述新的服务网关。
在本发明的一种实施例中， 所述前端网元为移动管理单元或者支持 S4 接口的 GPRS服务支持节点。
在本发明的一种实施例中， 所述方法还包括:所述控制器重选 GPRS服 务支持节点； 并将新的 GPRS服务支持节点的包含用户面地址信息的用户 面信息发送给与原 GPRS服务支持节点通信的无线网络控制器。
在本发明的一种实施例中， 所述用户面信息还包括隧道端点标识。 本发明实施例还提供了一种网关更新信息通知控制器， 包括重选模块 和发送模块； 其中，
所述重选模块， 配置为重选网关， 获得新的网关；
所述发送模块， 配置为将所述重选模块重选的网关的用户面信息发送 给对应的前端网元； 所述用户面信息包括所述新的服务网关的用户面地址 信息。
在本发明的一种实施例中， 其发送模块用于向所述前端网元发送携带 有所述新的网关的用户面信息的 GTP协议通告消息或 GTP协议更新承载请 求消息；
或用于向所述前端网元发送携带有更新指示的 GTP协议更新承载请求 消息， 并在所述前端网元根据所述更新指示发送 GTP协议修改承载请求消 息给控制器之后， 将携带有所述新的网关的用户面信息的承载响应信息发 送给所述前端网元。
在本发明的一种实施例中， 所述重选模块重选的网关至少包括以下之 一： 服务网关、 分组数据网络网关。
在本发明的一种实施例中， 所述重选模块还用于重选 GPRS服务支持 节点； 所述发送模块还用于将所述重选模块重选的 GPRS服务支持节点的 包含用户面地址信息的用户面信息发送给与原 GPRS服务支持节点通信的 无线网络控制器。
本发明的有益效果是：
本发明通过让控制器在重选网关后， 将重选的网关的用户面信息发送 给前端网元。 保证了前端网元能获知新选择的网关的用户面信息， 从而保 证了用户数据传送的连续性。
附图说明
图 1为用 SDN实现 EPS网络的架构图；
图 2为用 SDN实现的 GPRS系统接入到 EPS网络的架构图； 图 3为本发明实施例二提供的方法的流程图；
图 4为本发明实施例三提供的方法流程图；
图 5为本发明实施例四提供的方法的流程图；
图 6为本发明实施例四提供的另一种方法的流程图；
图 7为本发明实施例五提供的方法的流程示意图一；
图 8为本发明实施例五提供的方法的流程示意图二；
图 9为本发明实施例六提供的方法的流程示意图一；
图 10为本发明实施例六提供的方法流程示意图二； 图 11为实施例七提供的将新 PGW的信息通告给 MME的流程示意图。 具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。
实施例一：
为实现用 SDN实现 EPS/GPRS网络场景下， 控制器重选网关后也能使 用户业务连续， 本实施例提供的方法是： 在控制器重选网关后， 控制器将 新的网关的用户面信息发送给前端网元； 所述用户面信息包括所述新的网 关的用户面地址信息， 前端网元为移动管理单元 MME或者支持 S4接口的 GPRS服务支持节点 S4-SGSN。
在 SDN实现 EPS/GPRS网络的场景下， 控制器重选的网关可能是服务 网关 SGW或者分组数据网络网关 PGW， 也可能存在两种网关都被重选的 情况。
网关地址发生改变的情况有但不限于以下几种：
终端 UE发生了移动，为了保证终端 UE在新位置能拜访数据而尽量减 少数据的迂回， 控制器根据终端 UE的位置信息， 比如 TAI ( Tracking Area Identity, 跟踪区标识）信息或者是地址位置信息， 选择了新的 UGW作为 服务网关的用户面功能。 举例来讲， 终端 UE 因为移动， 发生了更换 eNB 的切换或者是 TAU ( Tracking Area Update, 跟踪区更新）， eNB把小区信息 报送给了 MME， 并进一步的报送给了控制器， 控制器根据策略（包括本地 策略和该 UE的签约策略等 ) 决定选择选择新的 UGW作为服务网关。
网络故障。 比如控制器根据网管系统报送的信息， 或者自己检测到的 网络运行的信息， 得知当前为该终端 UE服务的 UGW出现故障了， 控制器 因此选择新的 UGW执行服务网关用户面的功能。
网络负荷调整。比如控制器检测到当前为该 UE服务的 UGW负荷超载， 并且存在着其他轻载的 UGW， 于是控制器决定更换 UGW来执行服务网关 的用户面功能。
网络设备调整。 比如当前全网的 UGW都处于过度轻载状态，全部运行 会造成浪费， 因此需要关掉几部 UGW， 只是用其中的几部 UGW即可。 于 是， 当前该 UE的执行服务网关功能的 UGW可能被强制关闭， 服务网关的 功能需要转移到保留的 UGW之上， 导致了 UGW的更换。
虚拟机的调整。 因为 UGW是一个通用网关， 因此 UGW有可能是用虚 拟交换机实现的。 而虚拟交换机是在虚拟环境下的虚拟设备， 虚拟设备也 有可能因为各种原因导致对外通信 IP更改， 从而导致逻辑上等效的服务网 关更换。
某些场景下， 虚拟机的迁移可以保证虚拟机的对外 IP等不变， 这种场 景不会造成 UGW的更换。 不属于本发明要解决的范围。
针对上面列出的不同场景，控制器选择了新的 UGW作为服务网关，也 即， 服务网关的对外通信 IP地址发生了改变。 控制器可通过下发流表的方 式将终端 UE的承载上下文信息下发到新选择的 UGW上。 其中， 所述终端 UE的承载上下文信息包括 GTP(GPRS tunnel protocol, GTP隧道协议)隧道 信息 （例如， GTP隧道的 TEID， GTP隧道的端点网元地址， 端口号等）， 计费策略信息， QoS策略信息等。
以上几种情况都是以服务网关为例进行的说明， PGW也会因为同样的 原因而发生重选。
无论控制器重选的是 SGW还是 PGW, 控制器都会将新的网关的用户 面信息发送给对应的前端网元； 所述用户面信息包括所述新的网关的用户 面地址信息。
在 SDN实现 EPS网络的场景下，当发生重选的网关是 SGW或者 PGW 时， 控制器将新的网关的用户面信息发送给前端网元可以釆用以下三种方 式中的一种： A、控制器发送通告消息并携带所述重选的网关的用户面信息 给前端网元， 这里一般为 MME; B、 控制器发送更新承载请求消息并携带 所述重选的网关的用户面信息给所述 MME; C、 控制器发送更新承载请求 消息和指示给所述 MME， 所述指示的原因值为网关发生更换。 并根据所述 前端网元对该更新承载请求消息的反馈发送携带有所述新的网关的用户面 信息的承载响应信息给所述前端网元。
当发生重选的网关是 SGW时，所述控制器将所述新的网关的用户面信 息发送给对应的前端网元， 即前端网元在接收到控制器向它发送的新的服 务网关的用户面信息之后， 还要将新的服务网关的用户面信息发送给与原 服务网关通信的无线接入网， 这里一般发送给 eNB。
在 SDN实现 GPRS网络的场景下，当发生重选的网关是服务网关 SGW 或者分组数据网络网关 PGW时，控制器将新的网关的用户面信息发送给前 端网元可以釆用以下三种方式中的一种： A、控制器发送通告消息并携带所 述重选的网关的用户面信息给所述前端网元， 这里一般为支持 S4接口的 GPRS服务支持节点 S4-SGSN; B、 控制器发送更新承载请求消息并携带所 述重选的网关的用户面信息给 S4-SGSN; C、控制器发送更新承载请求消息 和指示给 S4-SGSN, 所述指示的原因值为网关发生更换。 并根据所述前端 网元对该更新承载请求消息的反馈发送携带有所述新的网关的用户面信息 的承载响应信息给所述前端网元。
当发生重选的网关是服务网关 SGW时，前端网元在接收到控制器向它 发送的新的服务网关的用户面信息之后， 还要将新的服务网关的用户面信 息发送给与原服务网关通信的无线接入网， 这里一般发送给 RNC。
在控制器将重选的服务网关 SGW 的用户面信息发送给与原服务网关 SGW通信的无线接入网之前还包括： 控制器将分组数据网络网关 PGW的 用户面信息发送给所述重新的服务网关 SGW。 这一步是为了保证在无线接 入网收到服务网关的用户面信息之后， 就可以实现用户上行数据发送到重 选的服务网关， 再发送到分组数据网络网关， 实现用户上行数据的传输。 用 SDN实现的 GPRS系统接入到 EPS网络还有另一种场景，就是由控 制器直接控制 UGW执行 SGSN和 GGSN ( Gateway GPRS Support Node, 网关 GPRS支持节点 )的控制面功能， 控制器和 RNC直接接口进行控制面 信令交互， RNC和 SGSN接口用于用户面数据的传输。 这种场景下， 控制 器会存在重选 SGSN的情况， 发生重选的原因同上， 也会存在用户数据中 断的问题， 为解决该问题， 控制器将重选的 GPRS服务支持节点 SGSN的 用户面信息发送给与原 GPRS服务支持节点 SGSN通信的无线接入网。 发 送的方式也可以是通过新增消息或者增强现有消息等。 同样可以釆用以上 提供的三种方式进行发送。
上述用户面信息包括用户面地址信息， 当服务网关的隧道端点标识 TEID也发生改变的时候， 用户面信息还包括重选的服务网关的隧道端点标 识 TEID发送给与原服务网关通信的无线接入网。当分组数据网络网关 PGW 的隧道端点标识 TEID也发生改变的时候，控制器还要将重选的分组数据网 络网关 PGW的隧道端点标识 TEID发送给移动管理单元 MME或者支持 S4 接口的 GPRS服务支持节点 S4-SGSN。
本实施例还提供了一种网关更新信息通知控制器， 该控制器包括重选 模块和发送模块； 所述重选模块用于重选网关； 所述发送模块用于将所述 重选模块重选的网关的用户面信息发送给对应的前端网元； 所述用户面信 息包括所述新的服务网关的用户面地址信息。
所述重选模块重选的网关包括服务网关和分组数据网络网关中的至少 一种。
所述重选模块还用于重选 GPRS服务支持节点； 所述发送模块还用于 将所述重选模块重选的 GPRS服务支持节点的用户面信息发送给与原 GPRS 服务支持节点通信的无线接入网。 所述重选模块可以由 CPU或 DSP等硬件实现；所述发送模块可以由天 配合 CPU或 DSP等硬件实现。
下面将用更加具体的实施例来说明本发明提供的信息的通知方法。 实施例二：
图 3所示的是在终端 UE从 EUTRAN/UTRAN接入 EPS核心网的场景 下， 当控制器选择了新的 UGW作为服务网关 SGW时， 如何传送系统中的 网关和网元的用户面信息。
步骤 S301 : 控制器因实施例一所述的原因选择了新的统一网关 UGW 作为服务网关 SGW;
步骤 S302: 控制器将分组数据网络网关 PGW的用户面信息通过下发 流表的方式发送给新服务网关 SGW， 或者说是重选的服务网关 SGW; 用 户面信息包括用户面地址信息， 具体的可为上行用户面地址信息。
步骤 S303: 控制器将新服务网关 SGW的用户面信息告知前端网元， 在终端 UE从 EUT AN接入 EPS核心网的场景下，具体是发送给移动管理 单元 MME; 在终端 UE从 UTRAN接入 EPS核心网的场景下， 具体是发送 给支持 S4接口的 GPRS服务支持节点 S4-SGSN。 经过上述下发流表后，新 的服务网关 SGW 已经完全准备好发送上行数据， 数据流因为没有从 eNB/RNC发送过来， 因此服务网关 SGW上暂时没有数据； PGW已经准备 好接受上行数据，下行数据还是通过老的流表从 PGW下发给老的服务网关 SGW。
步骤 S304: 前端网元在得知新服务网关 SGW的用户面信息之后， 会 向控制器反馈信息， 表示已经收到信息；
步骤 S305: 控制器在收到前端网元的回应消息之后， 就将 eNB/RNC 的下行用户面信息通过更新流表的方式更新到新服务网关 SGW上。并将新 服务网关 SGW的信息通过更新流表的方式更新到 PGW上， 这一步也可以 在步骤 S302进行。 同时， 控制器还可以删除 PGW上关于旧服务网关 SGW 的信息， 同时还可以删除旧服务网关 SGW上没有用的流表。 经过上述更新 流表后， 新的服务网关 SGW已经完全准备好发送下行数据。
实施例三：
图 4所示的是对于 SDN场景下的控制器和 RNC直接接口进行控制面 信令交互的 GPRS系统， 控制器选择了新的 UGW作为 SGSN时， 如何传 送系统中的网关和网元的用户面信息。
步骤 S401 : 控制器因实施例一所述的原因选择了新的统一网关 UGW 作为 SGSN;
步骤 S402: 控制器将与 SGSN通信的上行网关的用户面信息通过下发 流表的方式发送给新 SGSN; 用户面信息包括用户面地址信息，具体的可为 上行用户面地址信息。
步骤 S403: 控制器将新 SGSN的用户面信息告知无线接入网， 具体是 发送给无线网络控制器 RNC。 经过上述下发流表后， 新的 SGSN已经完全 准备好发送上行数据， 数据流因为没有从 RNC发送过来， 因此 SGSN上暂 时没有数据；
步骤 S404: NC在得知新 SGSN的用户面信息之后， 会向控制器反 馈信息；
步骤 S405： 控制器在收到 RNC的回应消息之后， 就将 RNC的下行用 户面信息通过更新流表的方式更新到新 SGSN 上， 这一步也可以在步骤 S402进行。 同时， 控制器还可以删除 PGW上关于旧 SGSN的信息， 同时 还可以删除旧 SGSN上没有用的流表。 经过上述更新流表后， 新的 SGSN 已经完全准备好发送下行数据。
需要说明的是： 虽然本实施例中的控制器只重选了 SGSN，但是对于比 较复杂的系统， 控制器会存在即重选 SGW和 /或 PGW， 又重选 SGSN的情 况。
实施例四：
图 5所示的是在终端 UE从 EUTRAN接入 EPS核心网的场景下，控制 器选择了新的 UGW作为服务网关 SGW时，如何通过 MME来通告 eNB新 的服务网关 SGW的用户面信息。
步骤 S501：控制器选择了新的 UGW作为服务网关 SGW,服务网关 SGW 的对外通信 IP地址改变。
控制器可以为新选择的服务网关 SGW使用为原服务网关 SGW分配的 TEID， 或者重新分配 TEID， 如果分配了新的 TEID， 则需要将该 TEID也 更新到 PGW之上。
此处流程图中只画出了一个 UGW， 实际情况是如图 1和图 2所示的， 控制器控制着一组 UGW， 其中的几个 UGW根据控制器的指令来扮演该 UE的新的服务网关 SGW， 老的服务网关 SGW和 PGW的角色。 因此控制 器在下发流表或者更新流表的时候， 应该到对应的 UGW上下发 /更新。
步骤 S502: 控制器通过 S11接口，使用通告消息携带新服务网关 SGW 的用户面信息发送给 MME。 其中服务网关 SGW的用户面信息包括用户面 信息、 对外通信的 IP地址（IPv4和 /或 IPv6 )， 和 TEID (如果重新分配了 TEID )0
步骤 S503a: MME向控制器回应通告响应消息。 该步骤也可以发生在 S505步之后， 即 S503b。
步骤 S504: MME通过 S1-MME接口的通告消息把带新服务网关 SGW 的用户面信息发送给无线接入网， 具体是无线接入网中的 eNB。
步骤 S505: eNB向 MME回应通告响应消息。
步骤 S506:收到 MME回应的响应消息后，控制器到新的服务网关 SGW 和 /或 PGW上更新流表。 控制器在下发流表或者更新流表的时候， 应该到对应的 UGW上下发 / 更新。
以上步骤 S502-步骤 S505中的通告消息和通告响应消息， 是 S11接口 和 S1-MME接口上新定义的 GTP消息和 S1-AP ( SI -Application Protocol, SI接口应用协议） 消息。 具体的消息交互方式和格式可能不像图中显示， 例如， 可能是两次握手的交互信息等。
在本发明的另一种实施例中， 其基本操作机制基本同上述实施例， 如 图 6所示，不同之处在于使用场景改为了 UE通过 UTRAN系统接入到 SDN 下的 EPC。网元和接口以及信令做了对应改变。其中 MME改为了 S4-SGSN, 控制器通过 S4接口和 S4-SGSN进行通信， S4-SGSN通过 Iu接口和无线接 入网， 具体为无线网络控制器进行通信。
实施例五：
图 7所示的是在终端 UE从 EUTRAN接入 EPS核心网的场景下，控制 器选择了新的 UGW作为服务网关 SGW时， 通过另一种方法来实现通过 MME来通告 eNB新的服务网关 SGW的用户面信息。
步骤 S701 : 同步骤 S501.
步骤 S702: 控制器发送更新承载请求（ Update Bearer Request ) 消息 携带新服务网关 SGW的用户面信息发送给 MME。 其中服务网关 SGW的 用户面信息为该消息中的扩展字段；其中服务网关 SGW的用户面信息包括 用户面信息、 对外通信的 IP地址（IPv4和 /或 IPv6 )， 和 TEID (如果重新 分配了 TEID ) .
步骤 S703a: MME向控制器回应更新承载响应消息。 该步骤也可以发 生在 S705步之后，即 S703b。
步骤 S704: MME发起现有协议中的服务网关 SGW重定位操作流程将 新服务网关 SGW的信息发送给 eNB。 MME发送服务网关 SGW重定位通 知消息给 eNB， 携带新服务网关 SGW的用户面信息。
步骤 S705: eNB向 MME回应服务网关 SGW重定位通知应答消息。 步骤 S707: 同步骤 S307。
步骤 S702， S703a, S703b中的消息除了上述介绍的更新承载请求 /响应 消息外，还可以可能是删除承载请求 /响应（ Delete Bearer Request/Response ) 消息和其他 GTP消息对， 但是作为首选， 推荐使用流程图中所展示的更新 承载请求 /响应消息。
在本发明的另一种实施例中， 其基本操作机制基本同上述实施例， 如 图 8所示，不同之处在于使用场景改为了 UE通过 UTRAN系统接入到 SDN 下的 EPC。网元和接口以及信令做了对应改变。其中 MME改为了 S4-SGSN, 控制器通过 S4接口和 S4-SGSN进行通信， S4-SGSN通过 Iu接口和无线接 入网， 具体为无线网络控制器进行通信。
实施例六：
图 9所示的是在终端 UE从 EUTRAN接入 EPS核心网的场景下，控制 器选择了新的 UGW作为服务网关 SGW时， 通过另一种方法来实现通过 MME来通告 eNB新的服务网关 SGW的用户面信息。
该实施例的基本操作机制基本同实施例二和实施例三， 不同之处在于 通过另外一种增强的 GTP 消息和 S1-AP 消息来传递新选择的服务网关 SGW的用户面信息。
步骤 S901 : 同步骤 S701。
步骤 S902: 控制器发送更新承载请求（Update Bearer Request )消息给 MME。 消息中携带指示， 指示 MME需要发起服务网关 SGW重定位的操 作。 其中该指示可以是现有消息中的原因值的扩展， 或者是新增的信元。
步骤 S903: MME向控制器回应更新承载响应消息；
步骤 S904: MME发起服务网关 SGW更新操作流程； MME向控制器 Controller发送 GTP消息的修改承载请求消息 （ Modify Bearer Request )0 步骤 S905: 控制器 Controller回应修改承载响应消息给 MME， 消息中 携带新服务网关 SGW的用户面信息； 其中服务网关 SGW的用户面信息包 括用户面信息、 对外通信的 IP地址（ IPv4和 /或 IPv6 )， 和 TEID (如果重 新分配了 TEID );
步骤 S906: MME发送服务网关 SGW重定位通知消息给 eNB， 携带新 服务网关 SGW的用户面信息。
步骤 S907: eNB向 MME回应服务网关 SGW重定位通知应答消息。 步骤 S908: 本步骤为可选， 如果 eNB 侧的隧道信息发生了改变， 则 MME向控制器发送修改承载请求消息， 将 eNB侧的新的隧道信息， 比如 eNB的对外 IP地址或者 GTP隧道的 TEID携带给控制器。
步骤 S909: 控制器向 MME回应修改承载响应消息。
步骤 S910: 同步骤 S606。
步骤 S902， S903中的消息除了上述介绍的更新承载请求 /响应消息外， 还可以可能是删除承载请求 /响应 （ Delete Bearer Request/Response ) 消息和 其他 GTP消息对，步骤 S904和 S905的消息除了是修改承载请求 /响应消息 外， 还可能是创建承载请求 /响应 （ Create Bearer Request/Response ) 消息对 及其他 GTP消息对。 但是作为首选， 推荐使用流程图中所展示的更新承载 请求 /响应消息， 和修改承载请求 /响应消息。
在本发明的另一种实施例中， 其基本操作机制基本同上述实施例， 如 图 10所示，不同之处在于使用场景改为了 UE通过 UTRAN系统接入到 SDN 下的 EPC。网元和接口以及信令做了对应改变。其中 MME改为了 S4-SGSN, 控制器通过 S4接口和 S4-SGSN进行通信， S4-SGSN通过 Iu接口和无线接 入网， 具体为无线网络控制器进行通信。
实施例七： 在执行 PGW功能的 UGW被重选， PGW的用户面地址改变之后， 为 防止后续的切换操作出错， 控制器还要将 PGW 的信息告知 MME 或者 S4-SGSN。 发送信息同样可以釆用上述实施例四至六中介绍的通过增加消 息或者增强现有消息的方式。
图 11所示的就是在终端 UE从 EUTRAN接入 EPS核心网的场景下， 如何通过控制器将新 PGW的信息通告给 MME。
步骤 S1101 : 控制器选择了新的 UGW作为 PGW,PGW的对外通信 IP 地址改变。
步骤 S1102: 控制器通过 S11接口， 使用通告消息携带新 PGW的用户 面信息发送给 MME。 其中 PGW的用户面信息包括用户面信息、 对外通信 的 IP地址（ IPv4和 /或 IPv6 ), 和 TEID (如果重新分配了 TEID )0
步骤 S1103: MME向控制器回应通告响应消息。 该步骤为可选。
在另一种实施方式中， 其基本步骤同上述实施例， 只是在上述步骤 S1102 中， 控制器釆用实施例五所述的方法发送更新承载请求消息并携带 PGW的用户面信息给 MMEo
在本发明的另一种实施例中， 其基本操作机制基本同上述实施例， 不 同之处在于使用场景改为了 UE通过 UTRAN系统接入到 SDN下的 EPC。 网元和接口以及信令做了对应改变。 其中 MME改为了 S4-SGSN, 控制器 通过 S4接口和 S4-SGSN进行通信。
显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤 可以用通用的计算装置 （包括交换机， 路由器， 服务器以及其他网络设备 等） 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 分别制作成各个集成电路模块， 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， 本发明不限制于任何特定的硬件和软件结 合。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的 普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单 推演或替换， 都应当视为属于本发明的保护范围。

Claims

权利要求书
1、 一种网关更新信息通知方法， 所述方法包括：
控制器进行网关重选， 获得新的网关；
所述控制器将所述新的网关的用户面信息发送给对应的前端网元； 其 中， 所述用户面信息包括所述新的网关的用户面地址信息。
2、 根据权利要求 1所述的网关更新信息通知方法， 其中， 所述网关至 少包括以下之一： 服务网关、 分组数据网络网关。
3、 根据权利要求 1所述的网关更新信息通知方法， 其中， 所述控制器 将所述新的网关的用户面信息发送给对应的前端网元， 包括：
向所述前端网元发送携带有所述新的网关的用户面信息的 GTP协议通 告消息或 GTP协议更新承载请求消息；
或向所述前端网元发送携带有更新指示的 GTP协议更新承载请求消 息， 所述前端网元根据所述更新指示发送 GTP协议修改承载请求消息给控 制器， 控制器在 GTP协议修改承载响应中将携带有所述新的网关的用户面 信息的承载响应信息给所述前端网元。
4、 根据权利要求 2所述的网关更新信息通知方法， 其中， 所述网关包 括服务网关时， 所述控制器将所述新的网关的用户面信息发送给对应的前 端网元之后， 所述方法还包括： 所述前端网元将新的服务网关的用户面信 息通过 S1接口应用协议消息或者 Iu消息发送给与原服务网关通信的无线接 入网。
5、 根据权利要求 4所述的网关更新信息通知方法， 其中， 所述前端网 元将新的服务网关的用户面信息通过 S1接口应用协议消息或者 Iu消息发送 给与原服务网关通信的无线接入网中的无线网络控制器或者演进的 NodeB 基站。
6、 根据权利要求 5所述的网关更新信息通知方法， 其中， 在所述前端 网元将新的服务网关的用户面信息发送给与原服务网关通信的无线接入网 之前， 所述方法还包括： 控制器将与原服务网关通信的分组数据网络网关 的用户面信息发送给所述新的服务网关。
7、 根据权利要求 2至 6任一项所述的网关更新信息通知方法， 其中， 所述前端网元为移动管理单元或者支持 S4接口的 GPRS服务支持节点。
8、 根据权利要求 1所述的网关更新信息通知方法， 其中， 所述方法还 包括： 所述控制器重选 GPRS服务支持节点； 并将新的 GPRS服务支持节 点的包含用户面地址信息的用户面信息发送给与原 GPRS服务支持节点通 信的无线网络控制器。
9、根据权利要求 1-6和 8任一项所述的网关更新信息通知方法，其中， 所述用户面信息还包括隧道端点标识。
10、 一种网关更新信息通知控制器， 所述控制器包括： 重选模块和发 送模块； 其中，
所述重选模块， 配置为重选网关， 获得新的网关；
所述发送模块， 配置为将所述重选模块重选的网关的用户面信息发送 给对应的前端网元； 所述用户面信息包括所述新的服务网关的用户面地址 信息。
11、 根据权利要求 10所述的控制器， 其中， 所述发送模块， 配置为向 所述前端网元发送携带有所述新的网关的用户面信息的 GTP协议通告消息 或 GTP协议更新承载请求消息；
并向所述前端网元发送携带有更新指示的 GTP协议更新承载请求消 息， 并在所述前端网元根据所述更新指示发送 GTP协议修改承载请求消息 给控制器之后， 将携带有所述新的网关的用户面信息的承载响应信息发送 给所述前端网元。
12、 根据权利要求 10所述的控制器， 其中， 所述网关至少包括以下之 一： 服务网关、 分组数据网络网关。
13、 根据权利要求 10至 12任一项所述的控制器， 其中， 所述重选模 块， 配置为重选 GPRS服务支持节点；
相应的， 所述发送模块， 配置为将所述重选模块重选的 GPRS服务支 持节点的包含用户面地址信息的用户面信息发送给与原 GPRS服务支持节 点通信的无线网络控制器。
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