WO2018166335A1 - 路由下发方法及设备 - Google Patents

路由下发方法及设备 Download PDF

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Publication number
WO2018166335A1
WO2018166335A1 PCT/CN2018/077018 CN2018077018W WO2018166335A1 WO 2018166335 A1 WO2018166335 A1 WO 2018166335A1 CN 2018077018 W CN2018077018 W CN 2018077018W WO 2018166335 A1 WO2018166335 A1 WO 2018166335A1
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WO
WIPO (PCT)
Prior art keywords
address
network element
plane network
element device
client
Prior art date
Application number
PCT/CN2018/077018
Other languages
English (en)
French (fr)
Inventor
龙思锐
孙晓东
Original Assignee
华为技术有限公司
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.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18766832.2A priority Critical patent/EP3588919A4/en
Priority to JP2019550777A priority patent/JP6851498B2/ja
Publication of WO2018166335A1 publication Critical patent/WO2018166335A1/zh
Priority to US16/569,946 priority patent/US11102170B2/en

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    • 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
    • H04L61/50—Address allocation
    • H04L61/5007—Internet protocol [IP] addresses
    • H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
    • 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
    • H04L61/50—Address allocation
    • H04L61/5007—Internet protocol [IP] addresses
    • H04L61/503—Internet protocol [IP] addresses using an authentication, authorisation and accounting [AAA] protocol, e.g. remote authentication dial-in user service [RADIUS] or Diameter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/14—Routing performance; Theoretical aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/64—Routing or path finding of packets in data switching networks using an overlay routing layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/025—Services making use of location information using location based information parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/20—Communication route or path selection, e.g. power-based or shortest path routing based on geographic position or location
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/248—Connectivity information update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H04W8/28—Number portability ; Network address portability
    • 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

Definitions

  • the present invention relates to the field of route allocation technologies, and in particular, to a route delivery method and device.
  • the system needs to allocate an IP address to the UE and advertise the route of the UE accessing the network according to the IP address of the UE.
  • a control plane (English: Control Plane, CP: CC) network element device and user plane (English: User Plane, abbreviation: UP) network element device integrated communication system
  • PGW PGW or The three-party server allocates an IP address to the UE.
  • the PGW sends a request message to the third-party server, and the IP address of the PGW is used as the client of the third-party server in the request message.
  • the third-party server binds different address pools to different PGW IP addresses.
  • the third-party server receives the request message sent by the PGW, the third-party server receives the PGW IP address from the request message.
  • the corresponding address pool allocates an IP address (referred to as a UE IP address) to the UE, and returns the UE IP address to the PGW. After receiving the IP address of the UE, the PGW determines the route that the UE accesses the network according to the IP address of the UE.
  • IP address referred to as a UE IP address
  • the system architecture of the separation of the CP network element and the UP network element is defined in the 3GPP standard, and the CP network element and the UP network element are separated into CU separation.
  • the original PGW is split into PGW-C and PGW-U
  • the original SGW is split into SGW-C and SGW-U.
  • one CP network element may correspond to one or more UP network elements, and different UP network elements may cover different Tracking Area List (TA list) ranges.
  • TA list Tracking Area List
  • the IP address of the UE is allocated by the PGW-C or the third server. Regardless of the allocation method, the PGW-C sends the IP address of the UE to the PGW-U, and the PGW-U delivers the UE-to-network route according to the IP address of the UE.
  • the two UEs belong to two TA lists, and the two TA lists each correspond to one UP network element, and the corresponding UP network elements of the two TA lists correspond to one CP network element.
  • the UE IP address is allocated by the third-party server
  • the CP network element interacts with the third-party server by using the same PGW IP address, and the third-party server according to the PGW IP address
  • a UE IP address is allocated to the two UEs in the corresponding address pool, where the UE IP addresses allocated by the third-party server for the two UEs may belong to the same network segment, thereby possibly causing different UPs to be the two UEs.
  • the route of the same network segment is delivered. If the routes of the same network segment are delivered to the two UEs, the downlink data packets from the network to the UE may not be forwarded to the UE through the correct PGW-U.
  • the embodiment of the present invention relates to a method and a device for routing a route to solve the problem that different UEs may allocate the same network segment route in a case where the IP address of the UE is allocated by the third-party server in the CU-separated system architecture.
  • an embodiment of the present invention provides a route delivery method, where the method includes:
  • the control plane network element device receives location information of the user equipment UE;
  • the control plane network element device sends an access request message to the third-party server by using the client IP address
  • the control plane network element device receives the UE IP address allocated by the third-party server to the UE according to the client IP address;
  • the control plane network element device determines, according to the UE IP address and the location information, a user plane network element device for sending a route to the UE.
  • a mapping relationship is established between the location of the UE and the IP address of the client.
  • the control plane network element device determines the client used when accessing the third-party server according to the location of the UE.
  • the IP address of the terminal so that when the UE under the user plane network element device managed by the control plane network element device is activated, the control plane network element device uses a different client IP address to access the third-party server, thereby avoiding the third-party server.
  • control plane network element device receives location information of the UE, including:
  • the control plane network element device receives a create session request message, where the create session request message carries the location information or the location information indication information.
  • control plane network element determines the location information of the UE according to the location information of the received session creation request message or the indication information of the location information.
  • control plane network element device determines, according to the location information, a client IP address used by the control plane network element device to access a third-party server, including:
  • the control plane network element device selects one of the at least one alternative IP address corresponding to the location area as the client IP address.
  • a location area corresponds to at least one candidate IP address. After the control plane network element device determines the location information of the UE, the control plane network element device determines the location area to which the UE belongs according to the location information of the UE. And selecting one of the at least one selected IP addresses corresponding to the location area to which the UE belongs as the client IP address.
  • the control plane network element device selects one of the multiple candidate IP addresses corresponding to the location area as the client.
  • End IP address including:
  • the control plane network element device selects one of the plurality of candidate IP addresses corresponding to the location area to use the frequency less than a preset threshold as the client IP address.
  • control plane network element device may select one of the at least one candidate IP address corresponding to the location area to use the frequency less than the preset threshold as the client IP address, thereby causing the location area
  • the corresponding client IP addresses maintain a relatively balanced frequency of use.
  • the client IP address corresponds to an address range, and the address range is divided into multiple address sub-segments;
  • the control plane network element device determines, according to the UE IP address and the location information, a user plane network element device for sending a route to the UE, including:
  • the control plane network element device determines an address subsection to which the UE IP address belongs
  • the control plane network element device determines a user plane network element device for delivering a route to the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs.
  • the address range corresponding to the client IP address is divided into multiple address sub-segments, and the control plane network element device determines the UE when determining the user plane network element device used for routing the UE for the UE.
  • the address sub-segment to which the IP address belongs, and then the user plane network element device for routing the UE is determined according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs.
  • the control plane network element device determines a user plane network element used for routing the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs.
  • Equipment including:
  • the control plane network element device determines whether an available route corresponding to the address sub-segment to which the UE IP address belongs has been delivered;
  • control plane network element device selects the user plane network element device that delivers the available route to deliver a route for the UE.
  • the embodiment of the present invention provides a route delivery method, where the method includes:
  • the control plane network element device receives location information of the UE, and determines a location area to which the UE belongs according to the location information;
  • the control plane network element device sends the information of the location area to the user plane network element device, where the user plane network element device determines, according to the information of the location area, that the user plane network element device accesses the third party server.
  • the control plane network element device receives the UE IP address sent by the user plane network element device, where the UE IP address is when the user plane network element device accesses the third party server by using the client IP address.
  • the three-party server is allocated according to the client IP address;
  • the control plane network element device determines another user plane network element device for delivering a route for the UE according to the information about the UE IP address and the location area.
  • the other user plane network element device may be the same device as the user plane network element device that receives the information of the location area, or may be a different device.
  • a mapping relationship is established between the location of the UE and the IP address of the client.
  • the control plane network element device determines the client used when accessing the third-party server according to the location of the UE.
  • the IP address of the terminal so that when the UE under the user plane network element device managed by the control plane network element device is activated, the control plane network element device uses a different client IP address to access the third-party server, thereby avoiding the third-party server.
  • control plane network element device receives location information of the UE, including:
  • the control plane network element device receives a create session request message, where the create session request message carries the location information or the location information indication information.
  • the client IP address corresponds to an address range, and the address range is divided into multiple address sub-segments;
  • control plane network element device determines, by the control plane network element device, another user plane network element device, configured to send a route to the UE, according to the UE IP address and the location information, including:
  • the control plane network element device determines an address subsection to which the UE IP address belongs
  • the control plane network element device determines another user plane network element device used for routing the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs.
  • the control plane network element device determines another user plane network for routing the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs.
  • Metadevices including:
  • the control plane network element device determines whether an available route corresponding to the address sub-segment to which the UE IP address belongs has been delivered;
  • control plane network element device selects the user plane network element device that delivers the available route to deliver a route for the UE.
  • an embodiment of the present invention provides a route delivery method, where the method includes:
  • the user plane network element device receives information about a location area sent by the control plane network element device;
  • the user plane network element device sends an access request message to the third party server by using the client IP address;
  • the user plane network element device receives the UE IP address allocated by the third party server to the UE according to the client IP address;
  • the user plane network element device sends the UE IP address to the control plane network element device, and the control plane network element device determines, according to the UE IP address and the location area information, that it is used for Another user plane network element device that sends a route to the UE.
  • the control plane network element device interacts with the third-party server through the user plane network element device, and the user plane network element device determines that the user plane network element device accesses the third-party server according to the location area of the UE.
  • the client IP address used so that when the UE under the user plane network element device managed by the control plane network element device is activated, the user plane network element device can access the third party server by using different client IP addresses, thereby It can be avoided that the UE IP address assigned by the third-party server to different UEs belongs to the same network segment.
  • the user plane network element device determines, according to the information of the location area, the client IP address used by the user plane network element device to access the third party server, including:
  • the control plane network element device selects one of the at least one alternative IP address corresponding to the location area as the client IP address.
  • the control plane network element device selects one of the multiple candidate IP addresses corresponding to the location area as the client.
  • End IP address including:
  • the control plane network element device selects one of the plurality of candidate IP addresses corresponding to the location area to use the frequency less than a preset threshold as the client IP address.
  • the embodiment of the present invention provides a route delivery device, which has the function of implementing the behavior of the control plane network element device in the route delivery method of the first aspect.
  • the functions are implemented by hardware, and can also be implemented by hardware corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the device comprises:
  • a receiving unit configured to receive location information of the user equipment UE
  • a determining unit configured to determine, according to the location information, a client IP address used by the control plane network element device to access a third-party server;
  • a sending unit configured to send an access request message to the third-party server by using the client IP address
  • the receiving unit is further configured to receive, by the third-party server, a UE IP address allocated to the UE according to the client IP address;
  • the determining unit is further configured to determine, according to the UE IP address and the location information, a user plane network element device for delivering a route to the UE.
  • the receiving unit receives the location information of the UE, and specifically includes:
  • the determining unit determines, according to the location information, a client IP address used by the control plane network element device to access a third-party server, including:
  • the determining unit selects one of the multiple candidate IP addresses corresponding to the location area as the client IP address. Specifically, including:
  • the client IP address corresponds to an address range, and the address range is divided into multiple address sub-segments;
  • Determining, by the determining unit, a user plane network element device for delivering a route to the UE according to the UE IP address and the location information specifically, performing:
  • the determining unit determines, according to the address sub-segment to which the UE IP address belongs, and the location area to which the UE belongs, a user plane network element device for delivering a route to the UE, specifically Including execution:
  • the location area to which the UE belongs corresponds to multiple user plane network element devices, it is determined whether the available route corresponding to the address sub-segment to which the UE IP address belongs has been delivered;
  • the user plane network element device that sends the available route is selected to deliver a route for the UE.
  • the apparatus comprises a processor and a transceiver, the transceiver being configured to perform respective functions of the transmitting unit and the receiving unit, the processor being configured to perform the determining The corresponding function of the unit. Also included in the apparatus is a memory for coupling with a processor that retains program instructions and data necessary for the apparatus.
  • the embodiment of the present invention provides a route delivery device, which has the function of implementing the behavior of the control plane network element device in the route delivery method of the second aspect.
  • the functions are implemented by hardware, and can also be implemented by hardware corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the device comprises:
  • a receiving unit configured to receive location information of the UE, and determine, according to the location information, a location area to which the UE belongs;
  • a sending unit configured to send the information of the location area to the user plane network element device, where the user plane network element device determines, according to the information of the location area, that the user plane network element device accesses the third party server Client IP address;
  • the receiving unit is further configured to receive a UE IP address sent by the user plane network element device, where the UE IP address is used by the user plane network element device to access a third party server by using the client IP address.
  • the third party server is allocated according to the client IP address;
  • a processing unit configured to determine another user plane network element device used for routing the UE according to the information about the UE IP address and the location area.
  • the receiving unit receives the location information of the UE, and specifically includes:
  • the client IP address corresponds to an address range, and the address range is divided into multiple address sub-segments;
  • the processing unit determines, according to the UE IP address and the location information, another user plane network element device, which is used to send a route to the UE, and specifically includes:
  • the processing unit determines another user plane network element device for routing the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs, Specifically, the implementation includes:
  • the location area to which the UE belongs corresponds to multiple user plane network element devices, it is determined whether the available route corresponding to the address sub-segment to which the UE IP address belongs has been delivered;
  • the user plane network element device that sends the available route is selected to deliver a route for the UE.
  • the apparatus comprises a processor and a transceiver, the transceiver being configured to perform respective functions of the transmitting unit and the receiving unit, the processor being configured to perform the processing The corresponding function of the unit. Also included in the apparatus is a memory for coupling with a processor that retains program instructions and data necessary for the apparatus.
  • the embodiment of the present invention provides a route delivery device, which has the function of implementing the user plane network element device behavior of the third aspect.
  • the functions are implemented by hardware, and can also be implemented by hardware corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the device comprises:
  • a receiving unit configured to receive information about a location area sent by the control plane network element device
  • a determining unit configured to determine, according to the information of the location area, a client IP address used by the user plane network element device to access a third-party server;
  • a sending unit configured to send an access request message to the third-party server by using the client IP address
  • the receiving unit is further configured to receive, by the third-party server, a UE IP address allocated to the UE according to the client IP address;
  • the sending unit is further configured to send the UE IP address to the control plane network element device, where the control plane network element device determines, according to the information about the UE IP address and the location area, that The other user plane network element device that the UE delivers the route.
  • the determining unit determines, according to the information of the location area, the client IP address used by the user plane network element device to access the third-party server, including:
  • the determining unit selects one of the multiple candidate IP addresses corresponding to the location area as the client IP address. Specifically, including:
  • the apparatus comprises a processor and a transceiver, the transceiver being configured to perform respective functions of the transmitting unit and the receiving unit, the processor being configured to perform the determining The corresponding function of the unit. Also included in the apparatus is a memory for coupling with a processor that retains program instructions and data necessary for the apparatus.
  • an embodiment of the present invention provides a computer readable storage medium having instructions stored therein that, when run on a computer, cause the computer to perform the methods described in the above aspects.
  • an embodiment of the present invention provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the methods described in the above aspects.
  • the method and device for routing a route in the embodiment of the present invention can solve the problem that different UEs may allocate the same network segment route when the IP address of the UE is allocated by the third-party server in the CU-separated system architecture.
  • FIG. 1 is a schematic diagram of a possible application scenario of the present application
  • FIG. 2 is a schematic diagram of a specific system for CU separation deployment
  • FIG. 3 is a flowchart of a route delivery method provided by the present application.
  • FIG. 5 is a flowchart of another route delivery method provided by the present application.
  • FIG. 6 is a flowchart of still another method for routing a route provided by the present application.
  • FIG. 7 is a schematic structural diagram of a control plane network element device according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of another control plane network element device provided by the present application.
  • FIG. 9 is a schematic structural diagram of a user plane network element device provided by the present application.
  • FIG. 10 is a schematic structural diagram of a network device involved in the present application.
  • FIG. 1 is a schematic diagram of a possible application scenario of the present application.
  • the system includes a UE, an access network (English: Access Network, AN for short), a user plane (English: User Plane, UP: network element), and a control plane (English: Control Plane). , referred to as: CP) network elements and business networks.
  • a UE access network
  • AN Access Network
  • UP User Plane
  • CP Control Plane
  • the system shown in FIG. 1 is a system in which a UP network element and a CP network element are separated from each other.
  • the original PGW is split into PGW-C and PGW-U
  • the original SGW is split into SGW-C and SGW-U
  • PGW-C and SGW-C can be collectively referred to as CP network.
  • PGW-C and SGW-C can be deployed independently or integrated.
  • PGW-U and SGW-U can be collectively referred to as UP NEs.
  • PGW-U and SGW- U can be deployed independently or integrated.
  • one CP network element may correspond to one or more UP network elements, and different UP network elements may cover different Tracking Area List (TA list) ranges.
  • TA list Tracking Area List
  • FIG. 2 is a schematic diagram of a specific system for CU separation deployment.
  • the deployment location of the SGW-C is higher than that of the SGW-U
  • the SGW-C manages multiple SGW-Us, or manages multiple SGW-U POOLs
  • each SGW-U POOL covers at least one TA list, which is different.
  • the TA list covered by the SGW-U may be different or may be partially or completely the same.
  • the UE IP address may be allocated by the CP network element or may be allocated by a third-party server, for example, may be allocated by an AAA server or a DHCP server. Regardless of the allocation method, the UE IP address needs to be sent to the UP through the Sx Session establishement request, and the route of the downlink data packet from the Operator's IP address Servers to the UE is issued by the PGW-U.
  • the UP network elements to which the two UEs belong may correspond to the same CP network element, in order to avoid the CP network element from the first
  • the third-party server allocates the UE IP addresses to the two UEs in the same network segment.
  • FIG. 3 is a flowchart of a route delivery method provided by the present application. As shown in FIG. 3, the processing steps of the method include:
  • Step S101 The control plane network element device receives the location information of the UE.
  • the control plane network element device acquires location information of the UE.
  • the control plane network element device receives the create session request message of the UE, and carries the location information of the UE or the indication information of the UE location information in the create session request message.
  • the location information may be a cell identifier of a cell accessed by the UE.
  • Step S102 The control plane network element device determines, according to the location information of the UE, the client IP address used by the control plane network element device to access the third-party server.
  • a mapping relationship between the location information of the UE and the IP address of the client is established.
  • one location area corresponds to one or more client IP addresses
  • one location area corresponds to one or more UP network elements.
  • the control plane network element device determines, according to the location information of the UE, the client IP address used by the control plane network element device to access the third-party server, including:
  • the control plane network element device determines, according to the location information of the UE, a location area to which the UE belongs, for example, determining a TA list to which the UE belongs;
  • the control plane network element device selects, from the at least one candidate IP address corresponding to the location area to which the UE belongs, as the client IP address of the control plane network element device to access the third-party server.
  • the control plane network element device may select one of the multiple candidate IP addresses corresponding to the location area to use the frequency less than a preset threshold.
  • the control plane network element device accesses the client IP address of the third-party server.
  • Step S103 The control plane network element device sends an access request message to the third-party server by using the client IP address. After receiving the access request message, the third-party server allocates the UE IP address to the UE according to the client IP address.
  • Step S104 The control plane network element device receives the UE IP address allocated by the third-party server to the UE according to the client IP address.
  • Step S105 The control plane network element device determines a user plane network element device for delivering a route for the UE according to the UE IP address and the location information of the UE.
  • each client IP address corresponds to an address range, and the address range is divided into multiple address sub-segments.
  • control plane network element device determines, according to the UE IP address and the location information of the UE, a user plane network element device for sending a route for the UE, where: the control plane network element device determines an address subsection to which the UE IP address belongs; The network element device determines a user plane network element device for routing the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs.
  • the control plane network element device determines whether the available route corresponding to the address sub-segment to which the UE IP address belongs has been delivered; if the available route has been sent.
  • the user plane network element device that sends the available route is configured to deliver a route for the UE.
  • a mapping relationship between the location of the UE and the IP address of the client is established.
  • the control plane network element device determines the client IP used when accessing the third-party server according to the location of the UE. The address, so that when the UE under the different user plane network element devices managed by the control plane network element device is activated, the control plane network element device uses different client IP addresses to access the third-party server, thereby preventing the third-party server from being a different UE.
  • the case where the assigned UE IP address belongs to the same network segment.
  • FIG. 4 is a flowchart of still another method for routing a route provided by the present application. As shown in FIG. 4, the processing steps of the method include:
  • Step S201 Binding at least one client IP address to the control plane network element device, where one location area (such as TA list) corresponds to one or more client IP addresses, and one location area corresponds to one or more UP network elements.
  • one location area such as TA list
  • Step S202 In the CU separation scenario, the number of client IP addresses increases due to the increase of the number of UP network elements.
  • the address pool on the third-party server performs address pool planning based on the client IP address. Different client IP addresses correspond to different address pools.
  • the addresses assigned by the third-party server belong to different address pools and do not belong to the same address sub-segment.
  • Step S203 The control plane network element device configures the address pool of the third-party server according to the address pool of the third-party server, and splits the address pool into multiple address sub-segments.
  • Step S204 When the control plane network element device receives the activation request, for example, when the UE creates the session request message, the control plane network element device determines the user plane network element device of the TA list area where the UE is located according to the location of the user access. Thereby determining the client IP address corresponding to the user plane network element device.
  • Step S205 The control plane network element device sends an access request message to the third-party server, where the access request message carries the determined client IP address.
  • Step S206 The third-party server allocates a UE IP address to the UE according to the client IP address in the access request message, and sends the UE IP address to the control plane network element device.
  • Step S207 The control plane network element device determines an address subsection to which the UE IP address allocated by the third party server belongs. When there are multiple user plane network element devices covering the same location area (such as the TA list), the control plane network element device determines whether the route of the address sub-section to which the UE IP address belongs has been sent and received on a user plane network element device, if After the user plane network element device is sent and received, the control plane network element device selects the user plane network element device that has delivered the route to deliver the route for the UE. If not, the control plane network element device can be based on other The policy, for example, the load sharing principle, selects a user plane network element device to deliver a route for the UE.
  • the policy for example, the load sharing principle, selects a user plane network element device to deliver a route for the UE.
  • Step S208 The control plane network element device sends an activation request to the user plane network element device selected in step S207, where the activation request carries the UE IP address and the address sub-segment to which the UE IP address belongs.
  • Step S209 The user plane network element device sends an address sub-segment route to the UE, and returns a response message to the control plane network element device.
  • the number of client IP addresses can be planned in the initial stage according to the expected maximum number of areas. For example, it is expected that 100 user planes with different coverage areas will be deployed. For the meta-device, only 10 user plane NE devices are deployed in the first phase, and the number of client IP addresses is planned according to 100.
  • the control plane network element device can bind multiple client IP addresses to the UP device of a certain (or a certain group) TA LIST area.
  • the control plane network element device calculates the address pool usage rate based on the client IP address. When the usage rate exceeds the threshold, the other client ip bound to the UP device in the TA LIST area is used to apply for an address from the third-party server.
  • the user plane NE device is added, the binding relationship between the client IP address and the user plane NE device is adjusted on the control plane NE device.
  • FIG. 5 is a flowchart of another route delivery method provided by the present application.
  • the control plane network element device does not directly communicate with the third-party server, but performs information interaction with the third-party server through forwarding of the user plane network element device.
  • the method includes:
  • Step S301 The control plane network element device receives location information of the UE, and determines a location area to which the UE belongs according to the location information.
  • the control plane network element device acquires location information of the UE.
  • the control plane network element device receives the create session request message of the UE, and carries the location information of the UE or the indication information of the UE location information in the create session request message.
  • the location information may be a cell identifier of a cell accessed by the UE.
  • the control plane network element device may determine, according to the cell identifier of the UE, a location area to which the UE belongs, for example, determine a TA list to which the UE belongs.
  • Step S302 The control plane network element device sends the information of the location area to which the UE belongs to the user plane network element device.
  • Step S303 The user plane network element device determines, according to the location area to which the UE belongs, the client IP address used by the user plane network element device to access the third party server.
  • the user plane network element device determines, according to the information of the location area, the client IP address used by the user plane network element device to access the third party server, including:
  • the control plane network element device selects one of the at least one alternative IP address corresponding to the location area as the client IP address.
  • the control plane network element device selects one of the multiple candidate IP addresses corresponding to the location area as the client IP address, including:
  • the control plane network element device selects one of the plurality of candidate IP addresses corresponding to the location area to use the frequency less than a preset threshold as the client IP address.
  • Step S304 The user plane network element device sends the access request message to the third party server by using the client IP address.
  • Step S305 The user plane network element device obtains, from the third-party server, the UE IP address allocated by the third-party server according to the client IP address.
  • Step S306 The user plane network element device sends the UE IP address to the control plane network element device.
  • Step S307 The control plane network element device determines another user plane network element device for delivering a route for the UE according to the information about the UE IP address and the location area.
  • each client IP address corresponds to an address range, and the address range is divided into multiple address sub-segments.
  • control plane network element device After the control plane network element device receives the UE IP address, the control plane network element device determines an address subsection to which the UE IP address belongs; and the control plane network element device according to the address subsection to which the UE IP address belongs And a location area to which the UE belongs determines another user plane network element device for routing the UE.
  • Determining, by the control plane network element device, another user plane network element device for routing the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs including: when If the location area to which the UE belongs corresponds to multiple user plane network element devices, the control plane network element device determines whether the available route corresponding to the address sub-segment to which the UE IP address belongs has been delivered; if the available route has been And sending, by the control plane network element device, the user plane network element device that sends the available route to send a route to the UE.
  • Step S308 The control plane network element device sends an activation request to another user plane network element device, where the activation request carries the UE IP address and the address subsection to which the UE IP address belongs.
  • Step S309 The user plane network element device sends an address sub-segment route to the UE, and returns a response message to the control plane network element device.
  • FIG. 6 is a flowchart of still another method for routing a route provided by the present application.
  • the control plane network element device does not directly communicate with the third-party server, but performs information interaction with the third-party server through forwarding of the user plane network element device.
  • the processing steps of the method include: :
  • Step S401 Binding at least one client IP address to the user plane network element device, where one location area (such as TA list) corresponds to one or more client IP addresses, and one location area corresponds to one or more UP network elements.
  • one location area such as TA list
  • Step S402 In the CU separation scenario, the number of client IP addresses increases due to the increase of the number of UP network elements.
  • the address pool on the third-party server is planned according to the client IP address. Different client IP addresses correspond to different address pools.
  • the addresses assigned by the third-party server belong to different address pools and do not belong to the same address sub-segment.
  • Step S403 The control plane network element device configures the address pool of the third-party server according to the local mirroring of the address pool of the third-party server, and splits the address pool into multiple address sub-segments.
  • Step S404 When the control plane network element device receives the activation request, for example, when the UE creates the session request message, the control plane network element device determines the user plane network element device of the TA list area where the UE is located according to the location of the user access. It can be called a user plane network element device.
  • Step S405 The control plane network element device sends an access request message to the user plane network element device, where the access request message carries the location area information of the UE.
  • Step S406 The user plane network element device determines the client IP address according to the location area to which the UE belongs.
  • Step S407 The user plane network element device sends an access request message to the third-party server, where the access request message carries the determined client IP address.
  • Step S408 The third-party server allocates a UE IP address to the UE according to the client IP address in the access request message, and sends the UE IP address to the user plane network element device.
  • Step S409 The user plane network element device sends an access request message to the control plane network element device, where the access request message carries the UE IP address.
  • Step S410 The control plane network element device determines an address sub-segment to which the UE IP address allocated by the third-party server belongs. When there are multiple user plane network element devices covering the same location area (such as the TA list), the control plane network element device determines whether the route of the address sub-section to which the UE IP address belongs has been sent and received on a user plane network element device, if After the user plane network element device is sent and received, the control plane network element device selects the user plane network element device that has delivered the route to deliver the route for the UE. If not, the control plane network element device can be based on other The policy, for example, the load sharing principle, selects a user plane network element device to deliver a route for the UE.
  • the policy for example, the load sharing principle, selects a user plane network element device to deliver a route for the UE.
  • Step S411 The control plane network element device sends an activation request to the user plane network element device (assumed as the user plane network element device in FIG. 6) selected in step S410, where the activation request carries the UE IP address and the UE IP address. The subaddress of the address to which it belongs.
  • Step S412 The user plane network element device sends an address sub-segment route to the UE, and returns a response message to the control plane network element device.
  • the number of client IP addresses can be planned in the initial stage according to the expected maximum number of areas. For example, it is expected that 100 user planes with different coverage areas will be deployed. For the meta-device, only 10 user plane NE devices are deployed in the first phase, and the number of client IP addresses is planned according to 100.
  • the control plane network element device can bind multiple client IP addresses to the UP device of a certain (or a certain group) TA LIST area.
  • the control plane network element device calculates the address pool usage rate based on the client IP address. When the usage rate exceeds the threshold, the other client IP address bound to the UP device in the TA LIST area is used to apply for an address from the third-party server.
  • the user plane NE device is added, the binding relationship between the client IP address and the user plane NE device is adjusted on the control plane NE device.
  • the third-party server may be an AAA server or a DHCP server.
  • the client IP address type used for interaction with the AAA server is Client.
  • FIG. 7 is a schematic structural diagram of a control plane network element device provided by the present application. As shown in FIG. 7, the control plane network element device includes:
  • the receiving unit 501 is configured to receive location information of the user equipment UE.
  • a determining unit 502 configured to determine, according to the location information, a client IP address used by the control plane network element device to access a third-party server;
  • the sending unit 503 is configured to send an access request message to the third-party server by using the client IP address;
  • the receiving unit 501 is further configured to receive a UE IP address that is allocated by the third-party server to the UE according to the client IP address;
  • the determining unit 502 is further configured to determine, according to the UE IP address and the location information, a user plane network element device for delivering a route to the UE.
  • the receiving unit 501 receives the location information of the UE, and specifically includes:
  • the determining unit 502 determines, according to the location information, the client IP address used by the control plane network element device to access the third-party server, which specifically includes:
  • the determining unit 502 selects one of the multiple candidate IP addresses corresponding to the location area as the client IP. Address, specifically including execution:
  • the client IP address corresponds to an address range, and the address range is divided into multiple address sub-segments;
  • the determining unit 502 is configured to determine, according to the UE IP address and the location information, a user plane network element device for sending a route to the UE, which specifically includes:
  • the determining unit 502 determines a user plane network element device for routing the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs.
  • the implementation includes:
  • the location area to which the UE belongs corresponds to multiple user plane network element devices, it is determined whether the available route corresponding to the address sub-segment to which the UE IP address belongs has been delivered;
  • the user plane network element device that sends the available route is selected to deliver a route for the UE.
  • a mapping relationship is established between the location of the UE and the IP address of the client.
  • the control plane network element device determines the client IP address used when accessing the third-party server according to the location of the UE. Therefore, when the control plane network element device manages the UE activation under different user plane network element devices, the control plane network element device uses different client IP addresses to access the third-party server, thereby preventing the third-party server from being allocated to different UEs.
  • the UE IP address belongs to the same network segment.
  • FIG. 8 is a schematic structural diagram of another road control plane network element device provided by the present application. As shown in FIG. 8, the control plane network element device includes:
  • the receiving unit 601 is configured to receive location information of the UE, and determine, according to the location information, a location area to which the UE belongs;
  • the sending unit 602 is configured to send the information of the location area to the user plane network element device, where the user plane network element device determines, according to the information of the location area, that the user plane network element device accesses a third party server The client IP address used;
  • the receiving unit 601 is further configured to receive a UE IP address sent by the user plane network element device, where the UE IP address is used by the user plane network element device to access a third party server by using the client IP address.
  • the third party server is allocated according to the client IP address;
  • the processing unit 603 is configured to determine, according to the information about the UE IP address and the location area, another user plane network element device that is used to deliver a route for the UE.
  • the receiving unit 601 receives the location information of the UE, and specifically includes:
  • the client IP address corresponds to an address range, and the address range is divided into multiple address sub-segments;
  • the processing unit 603 determines, according to the UE IP address and the location information, another user plane network element device that is used to send a route to the UE, and specifically includes:
  • the processing unit 603 determines another user plane network element device for routing the UE according to the address sub-segment to which the UE IP address belongs and the location area to which the UE belongs. Specifically, including:
  • the location area to which the UE belongs corresponds to multiple user plane network element devices, it is determined whether the available route corresponding to the address sub-segment to which the UE IP address belongs has been delivered;
  • the user plane network element device that sends the available route is selected to deliver a route for the UE.
  • a mapping relationship is established between the location of the UE and the IP address of the client.
  • the control plane network element device determines the client IP address used when accessing the third-party server according to the location of the UE. Therefore, when the control plane network element device manages the UE activation under different user plane network element devices, the control plane network element device uses different client IP addresses to access the third-party server, thereby preventing the third-party server from being allocated to different UEs.
  • the UE IP address belongs to the same network segment.
  • FIG. 9 is a schematic structural diagram of a user plane network element device provided by the present application.
  • the user plane network element device includes: a receiving unit 701, configured to receive information about a location area sent by a control plane network element device;
  • a determining unit 702 configured to determine, according to information about the location area, a client IP address used by the user plane network element device to access a third-party server;
  • the sending unit 703 is configured to send an access request message to the third-party server by using the client IP address;
  • the receiving unit 701 is further configured to receive, by the third-party server, a UE IP address allocated to the UE according to the client IP address;
  • the sending unit 703 is further configured to send the UE IP address to the control plane network element device, where the control plane network element device determines to be used according to the UE IP address and the information of the location area. Another user plane network element device that routes the UE.
  • the determining unit 702 determines, according to the information of the location area, the client IP address used by the user plane network element device to access the third-party server, including:
  • the determining unit 702 selects one of the multiple candidate IP addresses corresponding to the location area as the client IP. Address, specifically including execution:
  • a mapping relationship is established between the location of the UE and the IP address of the client.
  • the control plane network element device determines the client IP address used when accessing the third-party server according to the location of the UE. Therefore, when the control plane network element device manages the UE activation under different user plane network element devices, the control plane network element device uses different client IP addresses to access the third-party server, thereby preventing the third-party server from being allocated to different UEs.
  • the UE IP address belongs to the same network segment.
  • FIG. 10 is a schematic structural diagram of a network device involved in the present application.
  • the network device shown in FIG. 10 can be used to perform the functions implemented by the control plane network element device shown in FIG. 7 or FIG. 8; optionally, the network device shown in FIG. 10 can also be used to perform the method shown in FIG. The function implemented by the user plane network element device.
  • the network device includes a transmitter/receiver 1001, a controller/processor 1002, a memory 1003, and a communication unit 1004.
  • the transmitter/receiver 1001 is configured to support transmission and reception of information between the network device and the UE in the foregoing embodiment, and to support radio communication between the network device and other network devices.
  • the controller/processor 1002 performs various functions for communicating with a UE or other network device.
  • the uplink signal from the UE is received via the antenna, coordinated by the receiver 1001, and further processed by the controller/processor 1002 to recover the traffic data and signaling information transmitted by the UE.
  • traffic data and signaling messages are processed by controller/processor 1002 and mediated by transmitter 1001 to generate downlink signals for transmission to other network devices or UEs via antennas.
  • the controller/processor 1002 also performs a route delivery method performed by the network device in the solution of the embodiment of the present invention.
  • the memory 1003 is used to store program codes and data of the network device.
  • the communication unit 1004 is configured to support the network device to communicate with other network entities.
  • the controller/processor 1002 in FIG. 10 is independent or through the memory.
  • the cooperation of 1003 is used to implement the functions implemented by the determining unit 502 in FIG. 7, and the transmitter/receiver 1001 is used to implement the functions implemented by the receiving unit 501 and the transmitting unit 503 in FIG.
  • the controller/processor 1002 in FIG. 10 is independent or through the memory.
  • the function of the processing unit 603 in FIG. 8 is implemented by the cooperation of 1003.
  • the transmitter/receiver 1001 is used to implement the functions implemented by the receiving unit 601 and the transmitting unit 602 in FIG.
  • the controller/processor 1002 in FIG. 10 is independent or through the memory.
  • the cooperation of 1003 is used to implement the functions implemented by the determining unit 702 in FIG. 9.
  • the transmitter/receiver 1001 is used to implement the functions implemented by the receiving unit 701 and the transmitting unit 702 in FIG.
  • Figure 10 only shows a simplified design of the network device.
  • the network device may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all network devices that can implement the present invention are within the scope of the present invention.
  • the controller/processor for performing the above-mentioned access device, STA function of the present invention may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and a field programmable gate. Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions.
  • the software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in the STA.
  • the processor and the storage medium can also exist as discrete components in the STA.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium, or the like.

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Abstract

本申请涉及路由分配技术领域，尤其涉及一种路由下发方法及设备。所述方法包括：控制面网元设备接收用户设备UE的位置信息；所述控制面网元设备根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址；所述控制面网元设备使用所述客户端IP地址向所述第三方服务器发送接入请求消息；所述控制面网元设备接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；所述控制面网元设备根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备。本发明实施例的路由下发方法及装置，能够解决在CU分离系统架构下，由第三方服务器分配UE IP地址的情况下可能产生的不同UE分配相同网段路由的问题。

Description

路由下发方法及设备
本申请要求于2017年3月16日提交中国专利局、申请号为201710157891.5、发明名称为“路由下发方法及设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及路由分配技术领域，尤其涉及一种路由下发方法及设备。
背景技术
用户设备(英文：User Equipment，简称：UE)在访问系统网络的时候，需要系统为UE分配一个IP地址，并且根据UE的IP地址发布UE访问网络的路由。
在典型的通信系统中，即控制面(英文：Control Plane，简称：CP)网元设备和用户面(英文：User Plane，简称：UP)网元设备集成在一起的通信系统，由PGW或者第三方服务器为UE分配IP地址，其中，在由第三方服务器为UE分配IP地址的情况下，PGW向第三方服务器发送请求消息，在请求消息中携带PGW作为第三方服务器的客户端时的IP地址(简称为PGW IP地址)，第三方服务器针对不同的PGW IP地址绑定了不同的地址池，当第三方服务器接收到PGW发送的请求消息后，第三方服务器根据请求消息中的PGW IP地址从对应的地址池中为UE分配IP地址(简称为UE IP地址)，并且将UE IP地址返回给PGW。PGW接收到UE IP地址后，根据UE IP地址确定UE访问网络的路由。
随着通信网络的发展，3GPP标准中定义了CP网元和UP网元分离的系统架构，CP网元和UP网元分离简称CU分离。在CU分离的系统架构下，原PGW被拆分为PGW-C和PGW-U，原SGW被拆分为SGW-C和SGW-U。在系统部署时，一个CP网元可能对应一个或者多个UP网元，不同的UP网元可能覆盖不同的跟踪区列表(Tracking Area list，TA list)范围。
在CU分离的系统架构下，由PGW-C或第三服务器分配UE的IP地址。无论哪种分配方式，由PGW-C将UE的IP地址发送给PGW-U，由PGW-U根据UE的IP地址下发UE到网络的路由。
在一种可能的场景下，两个UE分别属于两个TA list，所述两个TA list各自对应一个UP网元，所述两个TA list各自对应的UP网元对应一个CP网元。在由第三方服务器分配UE IP地址的情况下，当所述两个UE需要接入网络时，所述CP网元使用相同的PGW IP地址与第三方服务器交互，第三方服务器根据PGW IP地址从相应的地址池中为所述两个UE分配UE IP地址，其中，第三方服务器为这两个UE分配的UE IP地址可能属于同一个网段，由此可能导致不同UP为所述两个UE下发相同网段的路由。如果为两个UE下发相同网段的路由，可能无法保证从网络到UE的下行数据报文经正确的PGW-U转发到UE。
发明内容
本发明实施例涉及路由下发方法及设备，以解决在CU分离系统架构下，由第三方服务器分配UE IP地址的情况下可能会产生的不同UE分配相同网段路由的问题。
第一方面，本发明实施例提供了一种路由下发方法，所述方法包括：
控制面网元设备接收用户设备UE的位置信息；
所述控制面网元设备根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址；
所述控制面网元设备使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
所述控制面网元设备接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
所述控制面网元设备根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备。
在本发明实施例的实现方案中，将UE的位置与客户端IP地址之间建立映射关系，在UE激活的过程中，控制面网元设备根据UE的位置确定访问第三方服务器时使用的客户端IP地址，由此当控制面网元设备管理的不用用户面网元设备下的UE激活时，控制面网元设备使用不同的客户端IP地址访问第三方服务器，从而可以避免第三方服务器为不同UE分配的UE IP地址属于相同网段的情况。
在一种可能的设计中，所述控制面网元设备接收UE的位置信息，包括：
所述控制面网元设备接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
在本发明实施例的实现方案中，控制面网元根据接收到的创建会话请求消息中的位置信息或者位置信息的指示信息确定UE的位置信息。
在一种可能的设计中，所述控制面网元设备根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址，包括：
所述控制面网元设备根据所述UE的位置信息，确定所述UE所属的位置区域；
所述控制面网元设备从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
在本发明实施例的实现方案中，一个位置区域对应至少一个备选IP地址，当控制面网元设备确定UE的位置信息后，控制面网元设备根据UE的位置信息确定UE所属的位置区域，并且从UE所属位置区域所对应的至少一个被选IP地址中选择一个作为客户端IP地址。
在一种可能的设计中，当所述位置区域对应多个备选IP地址时，所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，包括：
所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
在本发明实施例的实现方案中，控制面网元设备可以从位置区域对应的至少一个备选 IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址，由此使位置区域对应的各个客户端IP地址均保持相对均衡的使用频率。
在一种可能的设计中，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
所述控制面网元设备根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备，包括：
所述控制面网元设备确定所述UE IP地址所属的地址子段；
所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备。
在本发明实施例实现方式中，客户端IP地址对应的地址范围被划分为多个地址子段，控制面网元设备在确定用于为UE下发路由的用户面网元设备时，确定UE IP地址所属的地址子段，之后根据UE IP地址所属的地址子段和UE所属的位置区域确定用于为UE下发路由的用户面网元设备。
在一种可能的设计中，所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备，包括：
当所述UE所属的位置区域对应多个用户面网元设备时，所述控制面网元设备确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
如果所述可用路由已经下发，则所述控制面网元设备选择下发所述可用路由的用户面网元设备为所述UE下发路由。
第二方面，本发明实施例提供了一种路由下发方法，所述方法包括：
控制面网元设备接收UE的位置信息，并且根据所述位置信息确定所述UE所属的位置区域；
所述控制面网元设备将所述位置区域的信息发送给用户面网元设备，用于所述用户面网元设备根据所述位置区域的信息确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
所述控制面网元设备接收所述用户面网元设备发送的UE IP地址，其中所述UE IP地址是所述用户面网元设备使用所述客户端IP地址访问第三方服务器时所述第三方服务器根据所述客户端IP地址分配的；
所述控制面网元设备根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
其中，所述另一用户面网元设备可以与接收所述位置区域的信息的用户面网元设备是相同的设备，也可以是不同的设备。
在本发明实施例的实现方式中，将UE的位置与客户端IP地址之间建立映射关系，在UE激活的过程中，控制面网元设备根据UE的位置确定访问第三方服务器时使用的客户端IP地址，由此当控制面网元设备管理的不用用户面网元设备下的UE激活时，控制面网元设备使用不同的客户端IP地址访问第三方服务器，从而可以避免第三方服务器为不同UE分配的UE IP地址属于相同网段的情况。
在一种可能的设计中，所述控制面网元设备接收UE的位置信息，包括：
所述控制面网元设备接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
在一种可能的设计中，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
所述控制面网元设备根据所述UE IP地址和所述位置信息确定用于为所述UE下发路由的另一用户面网元设备，包括：
所述控制面网元设备确定所述UE IP地址所属的地址子段；
所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备。
在一种可能的设计中，所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备，包括：
当所述UE所属的位置区域对应多个用户面网元设备时，所述控制面网元设备确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
如果所述可用路由已经下发，则所述控制面网元设备选择下发所述可用路由的用户面网元设备为所述UE下发路由。
第三方面，本发明实施例提供了一种路由下发方法，所述方法包括：
用户面网元设备接收控制面网元设备发送的位置区域的信息；
所述用户面网元设备根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
所述用户面网元设备使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
所述用户面网元设备接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
所述用户面网元设备将所述UE IP地址发送给所述控制面网元设备，用于所述控制面网元设备根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
在本发明实施例的实现方法中，控制面网元设备通过用户面网元设备与第三方服务器进行交互，并且由用户面网元设备根据UE的位置区域确定用户面网元设备访问第三方服务器所采用的客户端IP地址，由此当控制面网元设备管理的不用用户面网元设备下的UE激活时，可以通过用户面网元设备使用不同的客户端IP地址访问第三方服务器，从而可以避免第三方服务器为不同UE分配的UE IP地址属于相同网段的情况。
在一种可能的设计中，所述用户面网元设备根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址，包括：
所述控制面网元设备从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
在一种可能的设计中，当所述位置区域对应多个备选IP地址时，所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，包括：
所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择使用频率小于 预设阈值的一个作为所述客户端IP地址。
第四方面，为了实现上述第一方面的路由下发方法，本发明实施例提供了一种路由下发装置，该装置具有实现第一方面路由下发方法中控制面网元设备行为的功能。所述功能通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，所述装置包括：
接收单元，用于接收用户设备UE的位置信息；
确定单元，用于根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址；
发送单元，用于使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
所述接收单元，还用于接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
所述确定单元，还用于根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备。
在一种可能的设计中，所述接收单元接收UE的位置信息，具体包括执行：
接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
在一种可能的设计中，所述确定单元根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址，具体包括执行：
根据所述UE的位置信息，确定所述UE所属的位置区域；
从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
在一种可能的设计中，当所述位置区域对应多个备选IP地址时，所述确定单元从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，具体包括执行：
从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
在一种可能的设计中，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
所述确定单元根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备，具体包括执行：
确定所述UE IP地址所属的地址子段；
根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备。
在一种可能的设计中，所述确定单元根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备，具体包括执行：
当所述UE所属的位置区域对应多个用户面网元设备时，确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
如果所述可用路由已经下发，则选择下发所述可用路由的用户面网元设备为所述UE下发路由。
在又一种可能的设计中，所述装置的结构包括处理器和收发器，所述收发器被配置为执行上述发送单元和接收单元的相应功能，所述处理器被配置为执行所述确定单元的相应功能。所述装置中还可以包括存储器，所述存储器用于与处理器耦合，其保存所述装置必要的程序指令和数据。
第五方面，为了实现上述第二方面的路由下发方法，本发明实施例提供了一种路由下发装置，该装置具有实现第二方面路由下发方法中控制面网元设备行为的功能。所述功能通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，所述装置包括：
接收单元，用于接收UE的位置信息，并且根据所述位置信息确定所述UE所属的位置区域；
发送单元，用于将所述位置区域的信息发送给用户面网元设备，用于所述用户面网元设备根据所述位置区域的信息确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
所述接收单元，还用于接收所述用户面网元设备发送的UE IP地址，其中所述UE IP地址是所述用户面网元设备使用所述客户端IP地址访问第三方服务器时所述第三方服务器根据所述客户端IP地址分配的；
处理单元，用于根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
在一种可能的设计中，所述接收单元接收UE的位置信息，具体包括执行：
接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
在一种可能的设计中，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
所述处理单元根据所述UE IP地址和所述位置信息确定用于为所述UE下发路由的另一用户面网元设备，具体包括执行：
确定所述UE IP地址所属的地址子段；
根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备。
在一种可能的设计中，所述处理单元根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备，具体包括执行：
当所述UE所属的位置区域对应多个用户面网元设备时，确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
如果所述可用路由已经下发，则选择下发所述可用路由的用户面网元设备为所述UE下发路由。
在又一种可能的设计中，所述装置的结构包括处理器和收发器，所述收发器被配置为执行上述发送单元和接收单元的相应功能，所述处理器被配置为执行所述处理单元的相应功能。所述装置中还可以包括存储器，所述存储器用于与处理器耦合，其保存所述装置必 要的程序指令和数据。
第六方面，为了实现上述第三方面的路由下发方法，本发明实施例提供了一种路由下发装置，该装置具有实现第三方面的用户面网元设备行为的功能。所述功能通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，所述装置包括：
接收单元，用于接收控制面网元设备发送的位置区域的信息；
确定单元，用于根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
发送单元，用于使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
所述接收单元，还用于接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
所述发送单元，还用于将所述UE IP地址发送给所述控制面网元设备，用于所述控制面网元设备根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
在一种可能的设计中，所述确定单元根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址，具体包括执行：
从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
在一种可能的设计中，当所述位置区域对应多个备选IP地址时，所述确定单元从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，具体包括执行：
从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
在又一种可能的设计中，所述装置的结构包括处理器和收发器，所述收发器被配置为执行上述发送单元和接收单元的相应功能，所述处理器被配置为执行所述确定单元的相应功能。所述装置中还可以包括存储器，所述存储器用于与处理器耦合，其保存所述装置必要的程序指令和数据。
第七方面，本发明实施例提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
第八方面，本发明实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
本发明实施例的路由下发方法及设备，能够解决在CU分离系统架构下，由第三方服务器分配UE IP地址的情况下可能会产生的不同UE分配相同网段路由的问题。
附图说明
图1是本申请的一种可能的应用场景示意图；
图2是CU分离部署的一个具体系统的示意图；
图3是本申请提供的一种路由下发方法的流程图；
图4是本申请提供的又一种路由下发方法的流程图；
图5是本申请提供的另一种路由下发方法的流程图；
图6是本申请提供的再一种路由下发方法的流程图；
图7是本申请实施例提供的一种控制面网元设备的结构示意图；
图8是本申请提供的另一种控制面网元设备的结构示意图；
图9是本申请提供的用户面网元设备的结构示意图；
图10是本申请所涉及网络设备的一种可能的结构示意图。
具体实施方式
图1是本申请的一种可能的应用场景示意图。如图1所示，所述系统包括UE、接入网(英文：Access Network，简称:AN)网元、用户面(英文：User Plane，简称：UP)网元、控制面(英文：Control Plane，简称：CP)网元和业务网络。
图1所示的系统是一种UP网元和CP网元相互分离的系统。例如，在一种可能的设计中，原PGW被拆分为PGW-C和PGW-U，原SGW被拆分为SGW-C和SGW-U，PGW-C和SGW-C可以统称为CP网元，在实际部署时，PGW-C和SGW-C可以分别独立部署，也可以集成为一体；PGW-U和SGW-U可以统称为UP网元，在实际部署时，PGW-U和SGW-U可以分别独立部署，也可以集成为一体。在图1所示的系统中，一个CP网元可能对应一个或者多个UP网元，不同的UP网元可能覆盖不同的跟踪区列表(Tracking Area list，TA list)范围。
图2是CU分离部署的一个具体系统的示意图。如图2所示，SGW-C的部署位置高于SGW-U，SGW-C管理多个SGW-U，或者管理多个SGW-U POOL，每个SGW-U POOL覆盖至少一个TA list，不同SGW-U所覆盖的TA list可能均不相同，也可能部分或全部相同。
在图1和图2所示的系统中，当UE需要访问网络时，需要为UE分配一个UE IP地址。UE IP地址可以由CP网元分配，也可以由第三方服务器分配，例如可以由AAA服务器或者DHCP服务器分配。无论采用哪种分配方式，UE IP地址都需要CP网元通过Sx Session establishement request发送给UP，从Operator’s IP地址Servers到UE的下行数据报文的路由都由PGW-U发布。
在CU分离的场景下，当分别位于不同UP网元范围下的两个UE需要激活时，所述两个UE分别所属的UP网元可能对应同一个CP网元，为了避免CP网元从第三方服务器为该两个UE分配的UE IP地址在同一个网段，本发明实施例提供了如下的路由下发方案。
图3是本申请提供的一种路由下发方法的流程图。如图3所示，该方法的处理步骤包括：
步骤S101：控制面网元设备接收UE的位置信息。
在本发明实施例方案中，当UE需要激活时，控制面网元设备获取UE的位置信息。例如，控制面网元设备接收UE的创建会话请求消息，在所述创建会话请求消息中携带UE的位置信息或者UE位置信息的指示信息。可选的，所述位置信息可以是UE所接入小区的小区标识。
步骤S102：控制面网元设备根据UE的位置信息确定控制面网元设备访问第三方服务器所采用的客户端IP地址。
在本发明实施例方案中，将UE的位置信息与客户端IP地址之间建立映射关系，例如，一个位置区域对应一个或多个客户端IP地址，一个位置区域对应一个或多个UP网元。
控制面网元设备根据UE的位置信息确定控制面网元设备访问第三方服务器所采用的客户端IP地址包括：
控制面网元设备根据UE的位置信息，确定UE所属的位置区域，例如确定UE所属的TA list；
控制面网元设备从UE所属位置区域所对应的至少一个备选IP地址中选择一个作为控制面网元设备访问第三方服务器的客户端IP地址。
在本发明实施例方案中，当一个位置区域对应多个备选IP地址时，控制面网元设备可以从位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为控制面网元设备访问第三方服务器的客户端IP地址。
步骤S103：控制面网元设备使用所述客户端IP地址向第三方服务器发送接入请求消息。第三方服务器接收到所述接入请求消息后，第三方服务器根据所述客户端IP地址为UE分配UE IP地址。
步骤S104：控制面网元设备接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址。
步骤S105：控制面网元设备根据UE IP地址和UE的位置信息确定一个用于为UE下发路由的用户面网元设备。
在本发明实施例方案中，每个客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段。
相应的，控制面网元设备根据UE IP地址和UE的位置信息确定一个用于为UE下发路由的用户面网元设备包括：控制面网元设备确定UE IP地址所属的地址子段；控制面网元设备根据UE IP地址所属的地址子段和UE所属的位置区域确定一个用于为UE下发路由的用户面网元设备。
具体的，当UE所属的位置区域对应多个用户面网元设备时，控制面网元设备确定UE IP地址所属的地址子段所对应的可用路由是否已经下发；如果所述可用路由已经下发，则控 制面网元设备选择下发所述可用路由的用户面网元设备为UE下发路由。
在本发明实施例方案中，将UE的位置与客户端IP地址之间建立映射关系，在UE激活的过程中，控制面网元设备根据UE的位置确定访问第三方服务器时使用的客户端IP地址，由此当控制面网元设备管理的不同用户面网元设备下的UE激活时，控制面网元设备使用不同的客户端IP地址访问第三方服务器，从而可以避免第三方服务器为不同UE分配的UE IP地址属于相同网段的情况。
图4是本申请提供的又一种路由下发方法的流程图。如图4所示，该方法的处理步骤包括：
步骤S201：控制面网元设备上绑定至少一个客户端IP地址，其中，一个位置区域(如TA list)对应一个或多个客户端IP地址，一个位置区域对应一个或多个UP网元。
步骤S202：在CU分离场景下，由于UP网元增多，客户端IP地址的个数会增多。第三方服务器上的地址池根据客户端IP地址进行地址池规划，不同的客户端IP地址对应不同的地址池。当控制面网元设备使用不同的客户端IP地址向第三方服务器申请地址时，第三方服务器分配的地址属于不同的地址池，不会属于相同的地址子段。
步骤S203：控制面网元设备根据第三方服务器的地址池规划本地镜像配置第三方服务器的地址池，并且自行将地址池拆分成多个地址子段。
步骤S204：当控制面网元设备接收到激活请求时，例如接收到UE的创建会话请求消息时，控制面网元设备根据用户接入所在位置确定UE所在TA list区域的用户面网元设备，从而确定所述用户面网元设备所对应的客户端IP地址。
步骤S205：控制面网元设备向第三方服务器发送接入请求消息，所述接入请求消息中携带确定出的所述客户端IP地址。
步骤S206：第三方服务器根据所述接入请求消息中的客户端IP地址为UE分配UE IP地址，并将所述UE IP地址发送给控制面网元设备。
步骤S207：控制面网元设备确定第三方服务器分配的UE IP地址所属的地址子段。当存在多个用户面网元设备覆盖相同的位置区域(如TA list)时，控制面网元设备判断UE IP地址所属地址子段的路由是否已经在某个用户面网元设备上下发，如果已经在某个用户面网元设备上下发，则控制面网元设备选择已经下发所述路由的用户面网元设备为UE下发路由，如果尚未下发，控制面网元设备可以根据其它策略，例如负荷分担原则选择用户面网元设备为UE下发路由。
步骤S208：控制面网元设备向步骤S207中所选择的用户面网元设备发送激活请求，其中，在激活请求中携带UE IP地址和UE IP地址所属的地址子段。
步骤S209：用户面网元设备为UE下发地址子段路由，并向控制面网元设备返回响应消息。
为避免现新部署UP设备导致频繁改动第三方服务器上地址池的规划，客户端IP地址 数量可在初期按照预期的最多的区域数进行规划，例如预计最终部署100台覆盖区域不同的用户面网元设备，第一阶段只部署10台用户面网元设备，则客户端IP地址数量按100进行规划。
这种规划方式下，当实际部署时划分的区域数少于规划预期的最大区域数(即客户端IP地址数)时，如果每个TA LIST区域的UP设备只对应一个客户端IP地址，会出现某些客户端IP地址对应的地址池使用不到的情况。为避免这种情况出现，控制面网元设备可以上针对某个(或者某组)TA LIST区域的UP设备绑定多个客户端IP地址。并且控制面网元设备基于客户端IP地址统计地址池的使用率，当使用率超过阈值时，使用此TA LIST区域UP设备绑定的其它client ip向第三方服务器申请地址。当新增用户面网元设备时在控制面网元设备上调整客户端IP地址与用户面网元设备的绑定关系。
图5是本申请提供的另一种路由下发方法的流程图。在本发明实施例方案中，控制面网元设备不直接与第三方服务器通信，而是通过用户面网元设备的转发与第三方服务器进行信息交互。如图5所示，所述方法包括：
步骤S301：控制面网元设备接收UE的位置信息，并且根据所述位置信息确定所述UE所属的位置区域。
在本发明实施例方案中，当UE需要激活时，控制面网元设备获取UE的位置信息。例如，控制面网元设备接收UE的创建会话请求消息，在所述创建会话请求消息中携带UE的位置信息或者UE位置信息的指示信息。可选的，所述位置信息可以是UE所接入小区的小区标识。控制面网元设备可以根据UE的小区标识确定UE所属的位置区域，例如确定UE所属的TA list。
步骤S302：控制面网元设备将UE所属位置区域的信息发送给用户面网元设备。
步骤S303：用户面网元设备根据UE所属的位置区域确定用户面网元设备访问第三方服务器所采用的客户端IP地址。
所述用户面网元设备根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址，包括：
所述控制面网元设备从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
当所述位置区域对应多个备选IP地址时，所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，包括：
所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
步骤S304：用户面网元设备使用所述客户端IP地址向第三方服务器发送接入请求消息。
步骤S305：用户面网元设备从第三方服务器获取第三方服务器根据客户端IP地址分配的UE IP地址。
步骤S306：用户面网元设备将所述UE IP地址发送给控制面网元设备。
步骤S307：所述控制面网元设备根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
在本发明实施例方案中，每个客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段。
当控制面网元设备接收到UE IP地址后，所述控制面网元设备确定所述UE IP地址所属的地址子段；所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备。
所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备，包括：当所述UE所属的位置区域对应多个用户面网元设备时，所述控制面网元设备确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；如果所述可用路由已经下发，则所述控制面网元设备选择下发所述可用路由的用户面网元设备为所述UE下发路由。
步骤S308：控制面网元设备向另一用户面网元设备发送激活请求，其中，在激活请求中携带UE IP地址和UE IP地址所属的地址子段
步骤S309：用户面网元设备为UE下发地址子段路由，并向控制面网元设备返回响应消息。
图6是本申请提供的再一种路由下发方法的流程图。在本发明实施例方案中，控制面网元设备不直接与第三方服务器通信，而是通过用户面网元设备的转发与第三方服务器进行信息交互如图6所示，该方法的处理步骤包括：
步骤S401：用户面网元设备上绑定至少一个客户端IP地址，其中，一个位置区域(如TA list)对应一个或多个客户端IP地址，一个位置区域对应一个或多个UP网元。
步骤S402：在CU分离场景下，由于UP网元增多，客户端IP地址的个数会增多。第三方服务器上的地址池根据客户端IP地址进行规划，不同的客户端IP地址对应不同的地址池。当控制面网元设备使用不同的客户端IP地址向第三方服务器申请地址时，第三方服务器分配的地址属于不同的地址池，不会属于相同的地址子段。
步骤S403：控制面网元设备根据第三方服务器的地址池规划本地镜像配置第三方服务器的地址池，并且自行将地址池拆分成多个地址子段。
步骤S404：当控制面网元设备接收到激活请求时，例如接收到UE的创建会话请求消息时，控制面网元设备根据用户接入所在位置确定UE所在TA list区域的用户面网元设备，可称为用户面网元设备。
步骤S405：控制面网元设备向用户面网元设备发送接入请求消息，在所述接入请求消息中携带UE的位置区域信息。
步骤S406：用户面网元设备根据UE所属的位置区域确定客户端IP地址。
步骤S407：用户面网元设备向第三方服务器发送接入请求消息，所述接入请求消息中携带确定出的所述客户端IP地址。
步骤S408：第三方服务器根据所述接入请求消息中的客户端IP地址为UE分配UE IP地址，并将所述UE IP地址发送给用户面网元设备。
步骤S409：用户面网元设备向控制面网元设备发送接入请求消息，在所述接入请求消息中携带UE IP地址。
步骤S410：控制面网元设备确定第三方服务器分配的UE IP地址所属的地址子段。当存在多个用户面网元设备覆盖相同的位置区域(如TA list)时，控制面网元设备判断UE IP地址所属地址子段的路由是否已经在某个用户面网元设备上下发，如果已经在某个用户面网元设备上下发，则控制面网元设备选择已经下发所述路由的用户面网元设备为UE下发路由，如果尚未下发，控制面网元设备可以根据其它策略，例如负荷分担原则选择用户面网元设备为UE下发路由。
步骤S411：控制面网元设备向步骤S410中所选择的用户面网元设备(图6中假设为用户面网元设备)发送激活请求，其中，在激活请求中携带UE IP地址和UE IP地址所属的地址子段。
步骤S412：用户面网元设备为UE下发地址子段路由，并向控制面网元设备返回响应消息。
为避免现新部署UP设备导致频繁改动第三方服务器上地址池的规划，客户端IP地址数量可在初期按照预期的最多的区域数进行规划，例如预计最终部署100台覆盖区域不同的用户面网元设备，第一阶段只部署10台用户面网元设备，则客户端IP地址数量按100进行规划。
这种规划方式下，当实际部署时划分的区域数少于规划预期的最大区域数(即客户端IP地址数)时，如果每个TA LIST区域的UP设备只对应一个客户端IP地址，会出现某些客户端IP地址对应的地址池使用不到的情况。为避免这种情况出现，控制面网元设备可以上针对某个(或者某组)TA LIST区域的UP设备绑定多个客户端IP地址。并且控制面网元设备基于客户端IP地址统计地址池的使用率，当使用率超过阈值时，使用此TA LIST区域UP设备绑定的其它Client IP地址向第三方服务器申请地址。当新增用户面网元设备时在控制面网元设备上调整客户端IP地址与用户面网元设备的绑定关系。
在本发明实施例方案中，上述的第三方服务器可以为AAA服务器或者DHCP服务器，当控制面网元设备从AAA服务器申请UE IP地址时，用于与AAA服务器交互的客户端IP地址类型为Client IP地址；当控制面网元设备从DHCP服务器申请UE IP地址时，用于与DHCP服 务器交互的客户端IP地址类型为Agent IP地址。
图7是本申请提供的一种控制面网元设备的结构示意图。如图7所示，所述控制面网元设备包括：
接收单元501，用于接收用户设备UE的位置信息；
确定单元502，用于根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址；
发送单元503，用于使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
所述接收单元501，还用于接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
所述确定单元502，还用于根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备。
在一种可能的设计中，所述接收单元501接收UE的位置信息，具体包括执行：
接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
在一种可能的设计中，所述确定单元502根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址，具体包括执行：
根据所述UE的位置信息，确定所述UE所属的位置区域；
从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
在一种可能的设计中，当所述位置区域对应多个备选IP地址时，所述确定单元502从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，具体包括执行：
从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
在一种可能的设计中，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
所述确定单元502根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备，具体包括执行：
确定所述UE IP地址所属的地址子段；
根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备。
在一种可能的设计中，所述确定单元502根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备，具体包括执行：
当所述UE所属的位置区域对应多个用户面网元设备时，确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
如果所述可用路由已经下发，则选择下发所述可用路由的用户面网元设备为所述UE下发路由。
在本发明实施例方案中，将UE的位置与客户端IP地址之间建立映射关系，在UE激活过程中，控制面网元设备根据UE的位置确定访问第三方服务器时使用的客户端IP地址，由此当控制面网元设备管理不同的用户面网元设备下的UE激活时，控制面网元设备使用不同的客户端IP地址访问第三方服务器，从而可以避免第三方服务器为不同UE分配的UE IP地址属于相同网段的情况。
图8是本申请提供的另一种路控制面网元设备的结构示意图。如图8所示，所述控制面网元设备，包括：
接收单元601，用于接收UE的位置信息，并且根据所述位置信息确定所述UE所属的位置区域；
发送单元602，用于将所述位置区域的信息发送给用户面网元设备，用于所述用户面网元设备根据所述位置区域的信息确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
所述接收单元601，还用于接收所述用户面网元设备发送的UE IP地址，其中所述UE IP地址是所述用户面网元设备使用所述客户端IP地址访问第三方服务器时所述第三方服务器根据所述客户端IP地址分配的；
处理单元603，用于根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
在一种可能的设计中，所述接收单元601接收UE的位置信息，具体包括执行：
接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
在一种可能的设计中，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
所述处理单元603根据所述UE IP地址和所述位置信息确定用于为所述UE下发路由的另一用户面网元设备，具体包括执行：
确定所述UE IP地址所属的地址子段；
根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备。
在一种可能的设计中，所述处理单元603根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备，具体包括执行：
当所述UE所属的位置区域对应多个用户面网元设备时，确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
如果所述可用路由已经下发，则选择下发所述可用路由的用户面网元设备为所述UE下发路由。
在本发明实施例方案中，将UE的位置与客户端IP地址之间建立映射关系，在UE激活过程中，控制面网元设备根据UE的位置确定访问第三方服务器时使用的客户端IP地址，由此当控制面网元设备管理不同的用户面网元设备下的UE激活时，控制面网元设备使用不同的客户端IP地址访问第三方服务器，从而可以避免第三方服务器为不同UE分配的UE IP地址属于相同网段的情况。
图9是本申请提供的用户面网元设备的结构示意图。如图9所示，所述用户面网元设备包括：接收单元701，用于接收控制面网元设备发送的位置区域的信息；
确定单元702，用于根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
发送单元703，用于使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
所述接收单元701，还用于接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
所述发送单元703，还用于将所述UE IP地址发送给所述控制面网元设备，用于所述控制面网元设备根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
在一种可能的设计中，所述确定单元702根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址，具体包括执行：
从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
在一种可能的设计中，当所述位置区域对应多个备选IP地址时，所述确定单元702从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，具体包括执行：
从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
在本发明实施例方案中，将UE的位置与客户端IP地址之间建立映射关系，在UE激活过程中，控制面网元设备根据UE的位置确定访问第三方服务器时使用的客户端IP地址，由此当控制面网元设备管理不同的用户面网元设备下的UE激活时，控制面网元设备使用不同的客户端IP地址访问第三方服务器，从而可以避免第三方服务器为不同UE分配的UE IP地址属于相同网段的情况。
图10是本申请所涉及的网络设备的一种可能的结构示意图。可选的，图10所示网络设备可以用于执行图7或图8所示控制面网元设备所实现的功能；可选的，图10所示网络设备也可以用于执行图9所示用户面网元设备所实现的功能。如图10所示，网络设备包括发射器/接收器1001,控制器/处理器1002，存储器1003以及通信单元1004。所述发射器/接收器1001用于支持网络设备与上述实施例中的所述的UE之间收发信息，以及支持所述网络设备与其它网络设备之间进行无线电通信。所述控制器/处理器1002执行各种用于与UE或者其它网络设备通信的功能。在上行链路，来自所述UE的上行链路信号经由天线接收，由接收器1001进行调解，并进一步由控制器/处理器1002进行处理来恢复UE所发送到业务数据和信令信息。在下行链路上，业务数据和信令消息由控制器/处理器1002进行处理，并由发射器1001进行调解来产生下行链路信号，并经由天线发射给其它网络设备或者UE。控制器/处理器1002还执行本发明实施例方案中网络设备所执行的路由下发方法。存储器1003用于存储网络设备的程序代码和数据。通信单元1004用于支持网络设备与其它网络实体进行通信。
可选的，当图10所示的网络设备作为图7所示的控制面网元设备执行本发明实施例的路由下发方法时，图10中的控制器/处理器1002独立或者通过与存储器1003的配合来实现图7中确定单元502所实现的功能，发射器/接收器1001用于实现图7中接收单元501和发送单元503所实现的功能。
可选的，当图10所示的网络设备作为图8所示的控制面网元设备执行本发明实施例的路由下发方法时，图10中的控制器/处理器1002独立或者通过与存储器1003的配合来实现图8中处理单元603所实现的功能，发射器/接收器1001用于实现图8中接收单元601和发送单元602所实现的功能。
可选的，当图10所示的网络设备作为图9所示的用户面网元设备执行本发明实施例的路由下发方法时，图10中的控制器/处理器1002独立或者通过与存储器1003的配合来实现图9中确定单元702所实现的功能，发射器/接收器1001用于实现图9中接收单元701和发送单元702所实现的功能。
可以理解的是，图10仅仅示出了网络设备的简化设计。在实际应用中，网络设备可以包含任意数量的发射器，接收器，处理器，控制器，存储器，通信单元等，而所有可以实现本发明的网络设备都在本发明的保护范围之内。
用于执行本发明上述接入设备，STA功能的控制器/处理器可以是中央处理器(CPU)，通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)，现场可编程门阵列(FPGA)或者其他可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。
结合本发明公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬 盘、移动硬盘、CD-ROM或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于STA中。当然，处理器和存储介质也可以作为分立组件存在于STA中。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质等。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。

Claims (26)

  1. 一种路由下发方法，其特征在于，所述方法包括：
    控制面网元设备接收用户设备UE的位置信息；
    所述控制面网元设备根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址；
    所述控制面网元设备使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
    所述控制面网元设备接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
    所述控制面网元设备根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备。
  2. 如权利要求1所述的方法，其特征在于，所述控制面网元设备接收UE的位置信息，包括：
    所述控制面网元设备接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
  3. 如权利要求1或2所述的方法，其特征在于，所述控制面网元设备根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址，包括：
    所述控制面网元设备根据所述UE的位置信息，确定所述UE所属的位置区域；
    所述控制面网元设备从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
  4. 如权利要求3所述的方法，其特征在于，当所述位置区域对应多个备选IP地址时，所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，包括：
    所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
  5. 如权利要求3或4所述的方法，其特征在于，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
    所述控制面网元设备根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备，包括：
    所述控制面网元设备确定所述UE IP地址所属的地址子段；
    所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备。
  6. 如权利要求5所述的方法，其特征在于，所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备，包括：
    当所述UE所属的位置区域对应多个用户面网元设备时，所述控制面网元设备确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
    如果所述可用路由已经下发，则所述控制面网元设备选择下发所述可用路由的用户面网元设备为所述UE下发路由。
  7. 一种路由下发方法，其特征在于，所述方法包括：
    控制面网元设备接收UE的位置信息，并且根据所述位置信息确定所述UE所属的位置区域；
    所述控制面网元设备将所述位置区域的信息发送给用户面网元设备，用于所述用户面网元设备根据所述位置区域的信息确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
    所述控制面网元设备接收所述用户面网元设备发送的UE IP地址，其中所述UE IP地址是所述用户面网元设备使用所述客户端IP地址访问第三方服务器时所述第三方服务器根据所述客户端IP地址分配的；
    所述控制面网元设备根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
  8. 如权利要求7所述的方法，其特征在于，所述控制面网元设备接收UE的位置信息，包括：
    所述控制面网元设备接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
  9. 如权利要求7或8所述的方法，其特征在于，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
    所述控制面网元设备根据所述UE IP地址和所述位置信息确定用于为所述UE下发路由的另一用户面网元设备，包括：
    所述控制面网元设备确定所述UE IP地址所属的地址子段；
    所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备。
  10. 如权利要求9所述的方法，其特征在于，所述控制面网元设备根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备，包括：
    当所述UE所属的位置区域对应多个用户面网元设备时，所述控制面网元设备确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
    如果所述可用路由已经下发，则所述控制面网元设备选择下发所述可用路由的用户面网元设备为所述UE下发路由。
  11. 一种路由下发方法，其特征在于，所述方法包括：
    用户面网元设备接收控制面网元设备发送的位置区域的信息；
    所述用户面网元设备根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
    所述用户面网元设备使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
    所述用户面网元设备接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
    所述用户面网元设备将所述UE IP地址发送给所述控制面网元设备，用于所述控制面网元设备根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
  12. 如权利要求11所述的方法，其特征在于，所述用户面网元设备根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址，包括：
    所述控制面网元设备从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
  13. 如权利要求12所述的方法，其特征在于，当所述位置区域对应多个备选IP地址时，所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，包括：
    所述控制面网元设备从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
  14. 一种控制面网元设备，其特征在于，包括：
    接收单元，用于接收用户设备UE的位置信息；
    确定单元，用于根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址；
    发送单元，用于使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
    所述接收单元，还用于接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
    所述确定单元，还用于根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备。
  15. 如权利要求14所述的装置，其特征在于，所述接收单元接收UE的位置信息，具体包括执行：
    接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
  16. 如权利要求14或15所述的装置，其特征在于，所述确定单元根据所述位置信息确定所述控制面网元设备访问第三方服务器所采用的客户端IP地址，具体包括执行：
    根据所述UE的位置信息，确定所述UE所属的位置区域；
    从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
  17. 如权利要求16所述的装置，其特征在于，当所述位置区域对应多个备选IP地址时，所述确定单元从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，具体包括执行：
    从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
  18. 如权利要求16或17所述的装置，其特征在于，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
    所述确定单元根据所述UE IP地址和所述位置信息确定一个用于为所述UE下发路由的用户面网元设备，具体包括执行：
    确定所述UE IP地址所属的地址子段；
    根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备。
  19. 如权利要求18所述的装置，其特征在于，所述确定单元根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定一个用于为所述UE下发路由的用户面网元设备，具体包括执行：
    当所述UE所属的位置区域对应多个用户面网元设备时，确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
    如果所述可用路由已经下发，则选择下发所述可用路由的用户面网元设备为所述UE下发路由。
  20. 一种控制面网元设备，其特征在于，包括：
    接收单元，用于接收UE的位置信息，并且根据所述位置信息确定所述UE所属的位置区域；
    发送单元，用于将所述位置区域的信息发送给用户面网元设备，用于所述用户面网元设备根据所述位置区域的信息确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
    所述接收单元，还用于接收所述用户面网元设备发送的UE IP地址，其中所述UE IP地址是所述用户面网元设备使用所述客户端IP地址访问第三方服务器时所述第三方服务器根据所述客户端IP地址分配的；
    处理单元，用于根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
  21. 如权利要求20所述的装置，其特征在于，所述接收单元接收UE的位置信息，具体包括执行：
    接收创建会话请求消息，所述创建会话请求消息中携带所述位置信息或所述位置信息的指示信息。
  22. 如权利要求20或21所述的装置，其特征在于，所述客户端IP地址对应一个地址范围，所述地址范围被划分为多个地址子段；
    所述处理单元根据所述UE IP地址和所述位置信息确定用于为所述UE下发路由的另一用户面网元设备，具体包括执行：
    确定所述UE IP地址所属的地址子段；
    根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备。
  23. 如权利要求22所述的装置，其特征在于，所述处理单元根据所述UE IP地址所属的地址子段和所述UE所属的位置区域确定用于为所述UE下发路由的另一用户面网元设备，具体包括执行：
    当所述UE所属的位置区域对应多个用户面网元设备时，确定所述UE IP地址所属的地址子段所对应的可用路由是否已经下发；
    如果所述可用路由已经下发，则选择下发所述可用路由的用户面网元设备为所述UE 下发路由。
  24. 一种用户面网元设备，其特征在于，包括：
    接收单元，用于接收控制面网元设备发送的位置区域的信息；
    确定单元，用于根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址；
    发送单元，用于使用所述客户端IP地址向所述第三方服务器发送接入请求消息；
    所述接收单元，还用于接收所述第三方服务器根据所述客户端IP地址为所述UE分配的UE IP地址；
    所述发送单元，还用于将所述UE IP地址发送给所述控制面网元设备，用于所述控制面网元设备根据所述UE IP地址和所述位置区域的信息确定用于为所述UE下发路由的另一用户面网元设备。
  25. 如权利要求24所述的装置，其特征在于，所述确定单元根据所述位置区域的信息，确定所述用户面网元设备访问第三方服务器所采用的客户端IP地址，具体包括执行：
    从所述位置区域所对应的至少一个备选IP地址中选择一个作为所述客户端IP地址。
  26. 如权利要求25所述的装置，其特征在于，当所述位置区域对应多个备选IP地址时，所述确定单元从所述位置区域所对应的多个备选IP地址中选择一个作为所述客户端IP地址，具体包括执行：
    从所述位置区域所对应的多个备选IP地址中选择使用频率小于预设阈值的一个作为所述客户端IP地址。
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