WO2015089985A1 - 一种业务处理的方法、网络控制器及转发设备 - Google Patents

一种业务处理的方法、网络控制器及转发设备 Download PDF

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Publication number
WO2015089985A1
WO2015089985A1 PCT/CN2014/077878 CN2014077878W WO2015089985A1 WO 2015089985 A1 WO2015089985 A1 WO 2015089985A1 CN 2014077878 W CN2014077878 W CN 2014077878W WO 2015089985 A1 WO2015089985 A1 WO 2015089985A1
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WIPO (PCT)
Prior art keywords
terminal
network
forwarding device
forwarding
home
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PCT/CN2014/077878
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English (en)
French (fr)
Inventor
田甜
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中兴通讯股份有限公司
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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 US14/914,812 priority Critical patent/US9992717B2/en
Priority to EP14872949.4A priority patent/EP3043597B1/en
Publication of WO2015089985A1 publication Critical patent/WO2015089985A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • 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
    • H04L45/74—Address processing for routing
    • H04L45/745—Address table lookup; Address filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0226—Traffic management, e.g. flow control or congestion control based on location or mobility
    • 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
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention belongs to the field of data communications, and in particular, to a service processing method, a network controller, and a forwarding device.
  • WLAN Wireless Local Area Network
  • AP+AC AP Controller, Radio Access Controller
  • the terminal switches between APs Access Points, wireless access points
  • the maintenance of identity information and the switching of data channels are handled by the AC.
  • the air interface rate is about to enter the lGbps era.
  • the star architecture of AP+AC because an AC is responsible for managing tens to thousands of APs, AC will be under heavy data forwarding pressure, so that their routing and forwarding performance requirements are extremely high, and become Data bottleneck.
  • the bearer network still needs high-performance switches and routers to transmit data. In this way, the service network and the bearer network form two superimposed networks.
  • This overlapping architecture not only increases the forwarding delay, increases the management complexity and the probability of failure, but also increases the construction and maintenance cost of the network.
  • the IP field uses the MIP (Mobile IP) protocol to support IP mobility.
  • MIP Mobile IP
  • This protocol requires client support and has efficiency issues such as triangular routing.
  • the (Proxy Mobile IP) protocol which is entirely responsible for the IP mobile, is developed.
  • the PMIP protocol is a star architecture of the MAG (Mobile Access Gateway) + LMA (Local Mobility Anchor).
  • LMA Local Mobility Anchor
  • its network architecture still forms a service network (MAG/LMA supporting IP mobility) and two overlay networks of the carrier network.
  • 3 GPP (3rd Generation Partnership Project) also uses the terminal-led DSMIP (Dual Stack Mobile IP) protocol, which is similar to the MIP protocol and supports IPv4 and v6.
  • the control plane initiates DSMIPv6 signaling by the terminal: ⁇ signaling can be encapsulated and sent in an IPv4 tunnel.
  • the data plane is maintained by the terminal to the data tunnel of the PDN (Public Data Network) GW (Gateway).
  • the user data stream is forwarded by the terminal directly to the PDN GW through the GRE (General Routing Protocol Encapsulation) tunnel.
  • GRE General Routing Protocol Encapsulation
  • DHCP Dynamic Host Configuration Protocol
  • the current router technology can assign it the same IP address, but this requires the terminal to initiate a DHCP (Dynamic Host Configuration Protocol) process to refresh the router and its switches.
  • Data routing. DHCP takes a lot of time, and when switching frequently, the terminal repeatedly initiates DHCP, which is unnecessary and increases the network load. Also, for users who use static fixed IP addresses, the DHCP process is never initiated. Before the port of the routing/switch table is refreshed, the data sent to the terminal after the handover will not arrive correctly. This will result in discontinuous services after the terminal is switched, and even interrupt the service, which seriously reduces the user experience.
  • DHCP Dynamic Host Configuration Protocol
  • the currently popular SDN (Software Defined Network) uses a network architecture that separates control from forwarding. However, because it does not involve a WLAN network, WLAN terminal mobility is not supported. Summary of the invention
  • the present invention provides a service processing method, a network controller, and a forwarding device. Under the IP network architecture with separate control and forwarding, a WLAN terminal switches to a new wireless access device to maintain service continuity.
  • the present invention provides a service processing method, including:
  • the network controller learns that the terminal is off the network, acquiring information about the home forwarding device when the terminal is off the network;
  • the network controller determines a cache policy flow table, and sends the cache policy flow table to the home forwarding device.
  • the network controller acquires when the terminal is offline Information about the home forwarding device, including:
  • the network controller searches for the home forwarding device corresponding to the media access control address of the access device when the terminal is off the network, in the maintained table of the network access device and the home forwarding device.
  • the foregoing method further has the following features: after the network controller acquires information about the home forwarding device when the terminal is offline, the method further includes:
  • the network controller saves or updates the off-net device information of the terminal, where the off-net device information of the terminal includes: an off-network identifier, a network identifier of the terminal, and an access device information when the terminal is off-network, And the network identifier of the corresponding home forwarding device.
  • the present invention also provides a service processing method, including:
  • the network controller learns that the terminal switches, the home forwarding device information before the terminal handover and the current home forwarding device information of the terminal are obtained;
  • the network controller generates, for the home forwarding device before the terminal handover, a forwarding flow table for forwarding the cache data to the current home forwarding device, and switching to the home forwarding device before the terminal and the forwarding path
  • the forwarding device delivers the forwarding flow table.
  • the network controller acquiring, by the network controller, information about the home forwarding device before the handover of the terminal, including:
  • the network controller searches for the off-net device information of the terminal according to the network identifier of the terminal, and obtains the home forwarding device information before the terminal handover from the off-network device information of the terminal.
  • the network controller acquiring the current home forwarding device information of the terminal, including:
  • the network controller searches for the home forwarding device information corresponding to the media access control address of the access device in the network access information of the terminal in the maintained table of the network access device and the home forwarding device.
  • the foregoing method further has the following features: after the network controller acquires the home forwarding device information before the terminal handover and the current home forwarding device information of the terminal, the network controller further includes: The network controller saves or updates the network access device information of the terminal and deletes the off-network device information of the terminal, where the network access device information of the terminal includes: network identifier, access device information, and home forwarding of the terminal Device network ID.
  • the invention also provides a network controller, which comprises:
  • a first module configured to: obtain information about a home forwarding device when the terminal is off-net, and determine a cache policy flow table, and send the cache policy flow table to the home forwarding device;
  • a second module configured to: after obtaining the terminal handover, obtain the home forwarding device information before the terminal handover and the current home forwarding device information of the terminal; determine a forwarding policy, and calculate a home forwarding device before switching from the terminal to a forwarding path of the current home forwarding device of the terminal; generating, by the home forwarding device before the terminal handover, a forwarding flow table for forwarding the cached data to the current home forwarding device, and switching the previous home forwarding device to the terminal And forwarding the forwarding flow table by the forwarding device on the forwarding path.
  • the network controller further has the following features:
  • the first module obtains the information of the home forwarding device when the terminal is off the network in the following manner: In the maintained correspondence table between the entire network access device and the home forwarding device, searching for the media connection of the access device when the terminal is off-network The home forwarding device corresponding to the control address.
  • the network controller further has the following features:
  • the second module obtains the home forwarding device information before the terminal is switched in the following manner: searching for the off-net device information of the terminal according to the network identifier of the terminal, and acquiring the information from the off-network device information of the terminal Home forwarding device information before the terminal handover; and
  • the second module obtains the current home forwarding device information of the terminal in the following manner: In the maintained global network access device and the home forwarding device correspondence table, searching for media access of the access device in the terminal network access information Control the home forwarding device information corresponding to the address.
  • the foregoing network controller further has the following features:
  • a third module configured to save or update off-network device information of the terminal, where the off-net device information of the terminal includes: an off-network identifier, a network identifier of the terminal, and an access device when the terminal is off-network Information, and the network identity of the home forwarding device;
  • the network device information of the terminal is saved or updated, and the network device information of the terminal is deleted.
  • the network device information of the terminal includes: a network identifier of the terminal, access device information, and a network identifier of the home forwarding device.
  • the present invention also provides a service processing method, including:
  • the forwarding device receives the cache policy flow table delivered by the network controller
  • the forwarding device caches downlink data of the specified terminal according to the cache policy flow table.
  • the foregoing method further has the following features: after the forwarding device caches the downlink data of the specified terminal according to the cache policy flow table, the method further includes:
  • the forwarding device forwarding, by the forwarding device, the buffered downlink data to the designated forwarding device according to the forwarding flow table.
  • the present invention also provides a forwarding device, which includes:
  • a first module configured to receive a cache policy flow table sent by the network controller, and cache downlink data of the designated terminal according to the cache policy flow table;
  • a second module configured to receive the forwarding flow table sent by the network controller, and forward the buffered downlink data to the designated forwarding device according to the forwarding flow table.
  • the embodiment of the present invention provides a service processing method, a network controller, and a forwarding device.
  • a WLAN terminal Under the IP network architecture with separate control and forwarding, a WLAN terminal can maintain service continuity after switching to a new wireless access device.
  • Figure 1 is a diagram showing a typical network architecture of a related proxy mobile IPv6 protocol
  • FIG. 2 is a schematic diagram of an IP network that separates control and forwarding for supporting wireless access according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a network controller side service processing method according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a network controller side service processing method according to another embodiment of the present invention
  • 6 is a flowchart of an off-network in a mobile terminal according to Embodiment 1 of the present invention
  • FIG. 7 is a flowchart of a network entry in a mobile terminal according to Embodiment 1 of the present invention.
  • FIG. 8 is a flowchart of a terminal mobile switching access device according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a network controller according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a forwarding device according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of an IP network that separates control and forwarding for supporting wireless access according to an embodiment of the present invention, that is, a system architecture used in an embodiment of the present invention.
  • the IP network separated by the control and forwarding is composed of two subnets: a signaling control subnet composed of one or more network controllers, and multiple network forwarding devices interconnected by a network.
  • the data exchange subnet is formed.
  • the forwarding device refers to various switching devices that support SDN, including Layer 2 and Layer 3 switches supporting SDN, gateways, and the like.
  • the signaling control subnet calculates the user's data dynamic exchange policy and flow table in real time, and sends the switching policy and flow table to the data exchange subnet, which forwards the user data according to the switching policy and the flow table.
  • An AC is a logical network element that can be deployed independently or integrated into a control subnet. Its main functions are user identity authentication and service control, AP hardware and software management, and AP work status management.
  • the data stream of the terminal is transmitted by the data exchange subnet without AC.
  • the AP is directly connected, or connected to the switch of the data exchange subnet through a simple Layer 2 switch (referred to as a Layer 2 switch that does not support separation of control and forwarding), which is called the home switch (or home forwarding device) of the AP.
  • a simple Layer 2 switch referred to as a Layer 2 switch that does not support separation of control and forwarding
  • the home switch or home forwarding device
  • the process of the WLAN system terminal accessing the network is as follows: When the terminal joins the AP, that is, when the network enters the network, the identity authentication process is started; when the terminal leaves the AP, that is, when the network is off the network, the WLAN terminal can actively send off-network information according to the IEEE protocol, for some related WLANs. When the terminal does not send off-network information, it can also determine that it is off-grid by means such as keep-alive cycle detection.
  • the data forwarding device maintains a "local AP-home forwarding device correspondence table", and the network controller maintains a "full network AP-home switch correspondence table", and the entry includes at least a field: AP MAC, Forward device network ID, recent join time.
  • the above table can be maintained either statically or dynamically, for example:
  • the global manufacturer's AP has a dedicated MAC address segment, and the "manufacturer AP MAC address segment table" is stored in the network controller and the data forwarding device by means of pre-configuration or dynamic delivery, for example, downloading to the network controller through the network management system. It is then sent by the network controller to the forwarding device it manages.
  • the data forwarding device matches the corresponding MAC address according to the vendor MAC address segment table that is saved, and establishes and maintains the "local AP-home forwarding device correspondence table", including: the AP entry of the newly-sent data is added, and the AP table of the non-new data is added. Item update, the AP entry that is not sent or received or forcibly deleted is deleted for a long time, and the corresponding report information is sent to the network controller.
  • the network controller performs maintenance of the "net-to-home forwarding device correspondence table" according to the report information of the data forwarding device, including: adding, updating, and deleting the AP entry; the network controller may also determine the deletion of an AP entry according to the policy. And notify the data forwarding device to delete the corresponding entry.
  • Network-wide AP-Home Forwarding Device Correspondence Table (maintenance in the controller): Forwarding device network identifier 1, AP MAC address 1 (latest active time) Forwarding device network ID 1, AP MAC address 2 (latest active time)
  • the "manufacturer AP MAC address segment table" can be saved to the network controller and the data forwarding device by pre-configuration or dynamic delivery, for example, by pre-configuration to the network controller and the data forwarding device provider, or through the network management.
  • the system is downloaded to the network controller, and then sent by the network controller to the forwarding device it manages.
  • the "vendor AP MAC address segment table” has been saved in the default network controller and the forwarding device.
  • the signaling control subnet obtains the information about the terminal and the AP to which the terminal belongs.
  • the information includes at least: the terminal network identifier and the AP network identifier, and may also include other related information of the terminal and the AP (for example, , the current air interface rate of the terminal and the AP, neighbor AP information, etc.):
  • FIG. 3 is a flowchart of a network controller side service processing method according to an embodiment of the present invention. As shown in FIG. 3, the method in this embodiment includes: Step 11: After the network controller learns that the terminal is off the network, the terminal is obtained when the terminal is offline. Information of the home forwarding device;
  • Step 12 The network controller determines a cache policy flow table, and sends the cache policy flow table to the home forwarding device.
  • FIG. 4 is a flowchart of a network controller side service processing method according to another embodiment of the present invention. As shown in FIG. 4, the method in this embodiment includes: Step 21: After the network controller learns that the terminal switches, the terminal switches. The former home forwarding device information and the current home forwarding device information of the terminal;
  • Step 22 The network controller determines a forwarding policy, and calculates a forwarding path from the home forwarding device before the terminal handover to the current home forwarding device of the terminal.
  • Step 23 The network controller generates, for the home forwarding device before the terminal handover, a forwarding flow table for forwarding the cached data to the current home forwarding device, and switching to the home forwarding device and the forwarding path before the terminal is switched.
  • the forwarding device delivers the forwarding flow table.
  • FIG. 5 is a flowchart of a method for processing a forwarding device side according to an embodiment of the present invention. As shown in FIG. 5, the method in this embodiment includes:
  • Step 31 The forwarding device receives the cache policy flow table sent by the network controller, and buffers the downlink data of the designated terminal according to the cache policy flow table.
  • Step 32 The forwarding device receives the forwarding flow table sent by the network controller, and forwards the buffered downlink data to the designated forwarding device according to the forwarding flow table.
  • the signaling control subnet searches for the corresponding home forwarding device of the AP in the off-network message in the "full-network AP-home forwarding device correspondence table", and obtains the home forwarding device corresponding to the off-network AP. information.
  • the signaling control subnet informs the terminal of the off-network AP home forwarding device, which is called the preamble forwarding device, and the predecessor forwarding device caches the downlink data of the terminal. Buffer pool size, entry and exit strategies, overflow policies, etc., are not covered by this patent.
  • the signaling control subnet searches for the corresponding home forwarding device of the AP in the network access message in the "full network AP-home forwarding device correspondence table", and obtains the home forwarding device corresponding to the inbound network AP (referred to as the home forwarding device corresponding to the access network AP). Now belongs to the forwarding device) information.
  • the signaling control subnet calculates an uplink and downlink forwarding policy and a path for the terminal, generates a related forwarding flow table, and sends the forwarding flow table to each forwarding device on the forwarding path in the data switching subnet, and the forwarding device updates the forwarding flow table. Therefore, the uplink and downlink data are correctly and timely delivered after the terminal moves.
  • the signaling control subnet notifies the pre-home forwarding device to forward the downlink data buffered during the offline period of the terminal to the current home forwarding device.
  • FIG. 6 is a flowchart of the off-network operation of the terminal in the mobile device according to the first embodiment of the present invention, wherein the API is the wireless access device of the terminal, the AC is the AP controller, and the home forwarding device 1 is the home forwarding device of the API, and the scenario is the terminal
  • the API is off-grid, as shown in Figure 6, including the following steps:
  • the terminal or the API starts the off-network process, and the terminal sends the off-network information to the API.
  • the AC notifies the network controller terminal of the off-network information, where the information includes an off-network identifier, a terminal network identifier, an AP network identifier, and other related information of the terminal and the AP; or through step 402b, 402b, the API notifies the network controller terminal of the off-network information, where the information includes the terminal network identifier, the AP network identifier, and other related information of the terminal and the AP;
  • the network controller searches for the home forwarding device corresponding to the AP in the "Network Access Device - Home Forwarding Device Correspondence Table" according to the AP MAC address in the network off-network information, and obtains the home forwarding device 1 corresponding to the off-network AP.
  • the network controller may determine a forwarding/caching policy according to information such as a pre-configured policy, a network status, and/or user subscription information; and save/update the terminal off-network device information, including: an off-net identifier, a terminal network identifier, and an access device API MAC, Home forwarding device 1 network identifier;
  • the network controller sends a cache policy flow table update to the home forwarding device 1;
  • the home forwarding device 1 updates the forwarding policy/flow table, and buffers the downlink data sent to the terminal.
  • the size of the buffer pool, the entry and exit strategy, the overflow policy, etc., are outside the scope of this patent.
  • FIG. 7 is a flowchart of a network entry in a mobile terminal according to Embodiment 1 of the present invention.
  • the terminal is switched from the wireless access device API to the AP2, and the AC is the AP controller.
  • the home forwarding device 1 is the home forwarding device of the API
  • the home forwarding device 2 is the home forwarding device of the AP2.
  • the scenario is that the terminal moves from the AP2 to the network after the terminal moves. Different from the home forwarding device of AP2, as shown in Figure 7, the following steps are included:
  • the terminal switches to AP2 and completes identity authentication.
  • the AP2 notifies the network controller of the network access information, where the information includes the network access identifier, the terminal network identifier, the AP2 network identifier, and other related information of the terminal and the AP2, for example, the current air interface rate of the terminal and the AP2, the neighboring AP information, and the like.
  • the network access information may be directly notified to the network controller by the AP2, as shown in step 502a, or may be notified by the AC to the network controller, that is, step 502b;
  • the network controller searches for the information of the off-net device of the terminal according to the terminal network identifier in the network access information of the terminal, and obtains the information of the home forwarding device 1.
  • the network controller accesses the device according to the AP2 MAC in the network access information of the terminal.
  • the home forwarding device 2 of the AP2 is found in the home forwarding device correspondence table.
  • the network controller determines the forwarding policy, calculates the forwarding path, and generates the forwarding flow table.
  • the network controller may determine the forwarding policy according to the pre-configured policy, the network status, and/or the user subscription information, and the home forwarding device 2 And the related forwarding device N on the path (the path refers to the path of the external communication after the terminal switches to AP2) generates a forwarding flow table;
  • the forwarding path to the home forwarding device 2 generates a forwarding flow table for notifying the forwarding cache data for the home forwarding device 1, and generates a forwarding flow table for the related forwarding device M on the path, (N and M can both be 0, 1 Or multiple network controllers generate a flow table for each controlled forwarding device;
  • the network controller can save the terminal network device information (including: terminal network identifier, access AP information AP2 MAC, home forwarding device network identifier) And deleting the off-net device information of the terminal;
  • the network controller sends a policy/forwarding the flow table to the home forwarding device 2 and the related forwarding device.
  • the home forwarding device 2 and the related forwarding device N update the flow table
  • the network controller sends a flow table to the related forwarding device M.
  • the network controller sends a forwarding flow table for notifying the forwarding cache data to the home forwarding device 1; 506a, the home forwarding device 1 updates the flow table.
  • the home forwarding device 1 forwards the downlink data of the cached terminal to the home forwarding device 2. If the related forwarding device M exists in the middle, the data is forwarded to the home forwarding device 2 through the related forwarding device.
  • FIG. 8 is a flowchart of a terminal mobile handover access device according to an embodiment of the present invention.
  • the terminal switches from the wireless access device API to the AP2, and the AC is the AP controller.
  • the home forwarding device 1 is the home forwarding device of the API, and is also the home forwarding device of the AP2, and the wireless access device API before and after the terminal moves.
  • the home forwarding device of AP2 is the same. As shown in Figure 8, the following steps are included:
  • the terminal or the API starts the off-network process, and the terminal sends the off-network information to the API.
  • the API or the AC notifies the network controller terminal of the off-network information, where the information includes an off-network identifier, a terminal network identifier, an API network identifier, and other related information of the terminal and the API.
  • the network controller obtains the home forwarding device corresponding to the API in the “network access device-home forwarding device correspondence table” according to the API MAC in the terminal off-network information, and obtains the home forwarding device 1 corresponding to the off-network AP.
  • the network controller may determine a forwarding/caching policy according to information such as a pre-configured policy, a network status, and/or user subscription information; and save/update the terminal off-network device information, including: an off-net identifier, a terminal network identifier, and an access wireless device API MAC. , the home forwarding device 1 network identifier; 604, the network controller sends a cache policy flow table update to the home forwarding device 1;
  • the home forwarding device 1 updates the forwarding policy/flow table, and buffers the downlink data sent to the terminal.
  • the size of the buffer pool, the entry and exit strategy, the overflow policy, etc., are outside the scope of this patent.
  • the terminal switches to AP2 and completes identity authentication.
  • the AP2 or the AC notifies the network controller of the network access information, where the information includes the network access identifier, the terminal network identifier, the AP2 network identifier, and other related information of the terminal and the AP2, for example, the current air interface rate of the terminal and the AP2, and the neighboring AP information. Wait;
  • the network controller searches for the information of the off-net device of the terminal according to the terminal network identifier in the network access information of the terminal, and obtains the information of the home forwarding device 1.
  • the network controller accesses the device according to the AP2 MAC in the network access information of the terminal.
  • the corresponding home forwarding device 1 of AP2 is found in the forwarding device correspondence table.
  • the API is the same as the home forwarding device of AP2.
  • the network controller updates the policy/forwarding flow table for the home forwarding device 1; the network controller can save the terminal network device information (including: the terminal network identifier, the access AP information AP2 MAC, the home forwarding device network identifier), and delete the terminal.
  • Off-network device information including: the terminal network identifier, the access AP information AP2 MAC, the home forwarding device network identifier
  • the network controller sends a forwarding policy/flow table to the home forwarding device 1;
  • the home forwarding device 1 updates the flow table.
  • the home forwarding device 1 forwards the downlink data of the cached terminal to the AP2.
  • the forwarding will pass through other underlying switching devices, which are well known to those skilled in the art and will not be described in detail.
  • the network controller may further modify the duration and size of the home forwarding device cache data according to the policy configuration and settings, and may notify the controlled in steps 404, 504, 604, or 609.
  • the forwarding device performs the modification of the cache configuration.
  • the size of the buffer pool, the entry and exit strategy, the overflow policy, etc., are outside the scope of this patent.
  • FIG. 9 is a schematic diagram of a network controller according to an embodiment of the present invention. As shown in FIG. 9, the network controller 900 of this embodiment includes:
  • a first module 901 configured to: obtain information about a home forwarding device when the terminal is off-network, and determine a cache policy flow table, and send the cache policy flow table to the home forwarding Equipment
  • the second module 902 is configured to: after obtaining the terminal handover, obtain the home forwarding device information before the terminal handover and the current home forwarding device information of the terminal; determine a forwarding policy, and calculate a home forwarding device before switching from the terminal. a forwarding path to the current home forwarding device of the terminal; a forwarding flow table for forwarding the cached data to the current home forwarding device for the home forwarding device before the terminal handover, and the home forwarding before the handover to the terminal The forwarding flow table is delivered by the device and the forwarding device on the forwarding path.
  • the first module 901 obtains the information about the home forwarding device when the terminal is off the network in the following manner: In the maintained global network access device and the home forwarding device correspondence table, the access device when the terminal is offline is searched. The home access device corresponding to the media access control address.
  • the second module 902 obtains the home forwarding device information before the terminal is switched according to the following manner: searching for the off-net device information of the terminal according to the network identifier of the terminal, from the off-net device information of the terminal Obtaining the home forwarding device information before the terminal is switched; obtaining the current home forwarding device information of the terminal includes: searching, in the maintained global network access device and the home forwarding device correspondence table, the access in the terminal network access information The home forwarding device information corresponding to the media access control address of the device.
  • the network controller may further include:
  • the third module 903 is configured to save or update the off-net device information of the terminal, where the off-net device information of the terminal includes: an off-network identifier, a network identifier of the terminal, and an access when the terminal is off-network
  • the device information and the network identifier of the home forwarding device are used to save or update the network access device information of the terminal and delete the off-net device information of the terminal, where the network access device information of the terminal includes: the network identifier of the terminal, Incoming device information and home forwarding device network identifier.
  • FIG. 10 is a schematic diagram of a forwarding device according to an embodiment of the present invention. As shown in FIG. 10, the forwarding device 1000 of this embodiment includes:
  • the first module 1001 is configured to receive a cache policy flow table sent by the network controller, and cache the downlink data of the designated terminal according to the cache policy flow table.
  • the second module 1002 is configured to receive the forwarding flow table sent by the network controller, and forward the buffered downlink data to the designated forwarding device according to the forwarding flow table.
  • Embodiments of the present invention propose a support in an IP network architecture in which control and forwarding are separated.
  • the WLAN terminal mobility method, the data forwarding device and the network controller respectively maintain a correspondence table between the local and the entire network access device and the home forwarding device, and the signaling control subnet obtains the terminal off-network message, and searches for the "full network access device-
  • the home forwarding device corresponding to the off-network AP in the home forwarding device correspondence table generates a cache policy, and sends a policy/flow table message to the home forwarding device of the off-network AP to refresh the forwarding policy, so that the forwarding device to which the off-network AP belongs is timely Cache the downlink data of the terminal (the data sent by the terminal to the network side is called uplink data, and vice versa, the downlink data);
  • the signaling control subnet obtains the network access message of the terminal, and searches for "all network access device-home forwarding device corresponding In the table, the home forwarding device corresponding to the network access AP calculates the update path to generate the forwarding table, and the delivery policy/flow table message informs
  • a single bearer network can forward data and support IP mobility, avoiding the superposition of another network protocol to support IP mobility (such as protocols such as MIP/PMIP), and seamlessly integrate with network architectures such as control and forwarding separation.
  • the embodiment of the present invention provides a service processing method, a network controller, and a forwarding device.
  • a WLAN terminal Under the IP network architecture with separate control and forwarding, a WLAN terminal can maintain service continuity after switching to a new wireless access device. .

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Abstract

一种业务处理方法、网络控制器及转发设备，该方法包括：网络控制器获知终端离网后，获取终端离网时的归属转发设备的信息；所述网络控制器确定缓存策略流表，将所述缓存策略流表发送给所述归属转发设备。通过本发明实施例，在控制与转发分离的IP网络架构下，一种WLAN终端切换到新的一个无线接入设备后，能够保持业务的连续性。

Description

一种业务处理的方法、 网络控制器及转发设备
技术领域
本发明属于数据通信领域， 尤其涉及一种业务处理方法、 网络控制器及 转发设备。
背景技术
随着 3G/LTE (长期演进 ) /WiFi等移动数据网络的发展和手机 /平板电脑 等智能手持终端的普遍使用， 各种移动数据业务急剧发展， 又促使移动数据 网络迅速从热点覆盖走向热区覆盖。 这样， 在热区内支持 IP移动， 以保持用 户体验， 已成为移动数据网络必备的功能。
目前 WLAN (无线局域网 ) , 釆用基站 +基站控制器， 即 AP+AC ( AP Controller, 无线接入控制器） 的星型架构。 终端在 AP ( Access Point, 无线 接入点） 间切换时， 其身份信息的维护和数据通道的切换由 AC 负责。 随着 802.11ac产品的部署， 空口速率即将进入 lGbps时代。 如果继续沿用 AP+AC 的星型架构， 由于一台 AC—般负责管理几十到几千台 AP, 因而 AC将承受 庞大的数据转发压力， 以至于它们路由与转发性能要求极高， 且成为数据瓶 颈。 同时， 承载网仍然需要高性能的交换机与路由器来传输数据。 这样， 业 务网络与承载网络便形成了叠加的两张网， 这种重叠的架构， 既加大了转发 延迟、增加了管理复杂度和故障几率， 更大大增加了网络的建设和维护成本。
IP领域釆用 MIP (移动 IP )协议支持 IP的移动性， 该协议需要客户端支 持， 并有三角路由等效率问题。 为此， 又发展了完全由网络侧负责， 来支持 IP移动的 （代理移动 IP )协议。
如图 1所示， PMIP协议为 MAG ( Mobile Access Gateway, 移动接入网 关） + LMA ( Local Mobility Anchor, 本地移动锚） 的星型架构。 在数据业务 激增的情况下， LMA将会成为数据瓶颈。 除了需要路由器与无线接入点均支 持 PMIP协议外，其网络架构仍然形成了业务网络（支持 IP移动的 MAG/LMA ) 与 载网络的两张叠加网络。 3 GPP ( 3rd Generation Partnership Project, 第三代合作伙伴计划）还釆用 以终端主导的 DSMIP ( Dual Stack Mobile IP, 双栈移动 IP )协议， 该协议本 质与 MIP协议类似， 支持 IPv4和 v6。 控制面由终端发起 DSMIPv6信令： ΜΙΡνό信令可以封装在 IPv4隧道中发送。 数据面由终端维护到 PDN ( Public Data Network, 公用数据网） GW ( Gate Way, 网关） 的数据隧道， 用户数 据流由终端直接通过 GRE (通用路由协议封装）隧道转发给 PDN GW。 以上 均是业务网络与承载网络的叠加网架构。
当一个终端在路由器的各个端口间切换时， 当前的路由器技术已能给它 分配同一 IP地址， 但这需要终端发起 DHCP ( Dynamic Host Configuration Protocol, 动态主机配置协议） 流程以刷新路由器及其交换机的数据路由。 DHCP耗时较多， 且频繁切换时， 终端屡屡发起 DHCP既无必要也加重了网 络负荷。 而且对于使用静态固定 IP地址的用户， 从不发起 DHCP流程。 在路 由 /交换表的端口刷新之前， 发往切换后终端的数据将不能正确到达。 这将导 致终端切换后业务不连续， 甚至中断业务， 严重降低用户体验。
目前流行的 SDN(Software defined network, 软件定义网络)釆用控制与转 发分离的网络架构， 但因为不涉及 WLAN网络， 所以不支持 WLAN终端移 动。 发明内容
本发明提供一种业务处理方法、 网络控制器及转发设备， 在控制与转发 分离的 IP网络架构下， 一种 WLAN终端切换到新的一个无线接入设备后， 以保持业务的连续性。 本发明提供了一种业务处理方法， 包括：
网络控制器获知终端离网后， 获取终端离网时的归属转发设备的信息； 以及
所述网络控制器确定緩存策略流表， 将所述緩存策略流表发送给所述归 属转发设备。
可选地， 上述方法还具有下面特点： 所述网络控制器获取终端离网时的 归属转发设备的信息， 包括：
所述网络控制器在维护的全网接入设备与归属转发设备对应表中， 查找 所述终端离网时的接入设备的媒体接入控制地址对应的归属转发设备。
可选地， 上述方法还具有下面特点： 所述网络控制器获取终端离网时的 归属转发设备的信息之后， 还包括：
所述网络控制器保存或更新所述终端的离网设备信息， 所述终端的离网 设备信息包括： 离网标识、 所述终端的网络标识、 所述终端离网时的接入设 备信息， 以及对应的归属转发设备的网络标识。
本发明还提供了一种业务处理方法， 包括：
所述网络控制器获知终端切换后， 获取所述终端切换前的归属转发设备 信息和所述终端当前的归属转发设备信息；
所述网络控制器确定转发策略， 计算从所述终端切换前的归属转发设备 到所述终端当前的归属转发设备的转发路径； 以及
所述网络控制器为所述终端切换前的归属转发设备生成用以向当前的归 属转发设备转发緩存数据的转发流表， 并向所述终端切换前的归属转发设备 和所述转发路径上的转发设备下发所述转发流表。
可选地， 上述方法还具有下面特点： 所述网络控制器获取所述终端切换 前的归属转发设备信息， 包括：
所述网络控制器根据所述终端的网络标识查找所述终端的离网设备信 息，从所述终端的离网设备信息中获取所述终端切换前的归属转发设备信息。
可选地， 上述方法还具有下面特点： 所述网络控制器获取所述终端当前 的归属转发设备信息， 包括：
所述网络控制器在维护的全网接入设备与归属转发设备对应表中， 查找 所述终端入网信息中的接入设备的媒体接入控制地址对应的归属转发设备信 息。
可选地， 上述方法还具有下面特点： 所述网络控制器获取所述终端切换 前的归属转发设备信息和所述终端当前的归属转发设备信息之后， 还包括： 所述网络控制器保存或更新所述终端的入网设备信息并删除所述终端的 离网设备信息， 所述终端的入网设备信息包括： 所述终端的网络标识、 接入 设备信息， 以及归属转发设备网络标识。
本发明还提供了一种网络控制器， 其中， 包括：
第一模块， 其设置成获知终端离网后， 获取终端离网时的归属转发设备 的信息； 确定緩存策略流表， 将所述緩存策略流表发送给所述归属转发设备； 以及
第二模块， 其设置成获知终端切换后， 获取所述终端切换前的归属转发 设备信息和所述终端当前的归属转发设备信息； 确定转发策略， 计算从所述 终端切换前的归属转发设备到所述终端当前的归属转发设备的转发路径； 为 所述终端切换前的归属转发设备生成用以向当前的归属转发设备转发緩存数 据的转发流表， 并向所述终端切换前的归属转发设备和所述转发路径上的转 发设备下发所述转发流表。
可选地， 上述网络控制器还具有下面特点：
所述第一模块通过如下方式获取终端离网时的归属转发设备的信息： 在 维护的全网接入设备与归属转发设备对应表中， 查找所述终端离网时的接入 设备的媒体接入控制地址对应的归属转发设备。
可选地， 上述网络控制器还具有下面特点：
所述第二模块通过如下方式获取所述终端切换前的归属转发设备信息： 根据所述终端的网络标识查找所述终端的离网设备信息， 从所述终端的离网 设备信息中获取所述终端切换前的归属转发设备信息； 以及
所述第二模块通过如下方式获取所述终端当前的归属转发设备信息： 在 维护的全网接入设备与归属转发设备对应表中， 查找所述终端入网信息中的 接入设备的媒体接入控制地址对应的归属转发设备信息。
可选地， 上述网络控制器还具有下面特点： 还包括：
第三模块， 其设置成保存或更新所述终端的离网设备信息， 所述终端的 离网设备信息包括： 离网标识、 所述终端的网络标识、 所述终端离网时的接 入设备信息， 以及归属转发设备的网络标识； 以及 保存或更新所述终端的入网设备信息并删除所述终端的离网设备信息， 所述终端的入网设备信息包括： 所述终端的网络标识、 接入设备信息， 以及 归属转发设备网络标识。
本发明还提供了一种业务处理方法， 包括：
转发设备接收网络控制器下发的緩存策略流表； 以及
所述转发设备根据所述緩存策略流表緩存指定终端的下行数据。
可选地， 上述方法还具有下面特点： 所述转发设备根据所述緩存策略流 表緩存指定终端的下行数据之后， 还包括：
所述转发设备接收所述网络控制器下发的转发流表； 以及
所述转发设备根据所述转发流表将緩存的所述下行数据转发给指定的转 发设备。
本发明还提供了一种转发设备， 其中， 包括：
第一模块， 其设置成接收网络控制器下发的緩存策略流表， 根据所述緩 存策略流表緩存指定终端的下行数据； 以及
第二模块， 其设置成接收所述网络控制器下发的转发流表， 根据所述转 发流表将緩存的所述下行数据转发给指定的转发设备。
本发明实施例提供一种业务处理方法、 网络控制器及转发设备， 在控制 与转发分离的 IP网络架构下， 一种 WLAN终端切换到新的一个无线接入设 备后， 能够保持业务的连续性。 附图概述
图 1为相关代理移动 IPv6协议典型网络架构图；
图 2为本发明实施例的支持无线接入的控制与转发分离的 IP网络的示意 图；
图 3为本发明一实施例的网络控制器侧业务处理方法的流程图； 图 4为本发明另一实施例的网络控制器侧业务处理方法的流程图； 图 5为本发明实施例的转发设备侧业务处理方法的流程图； 图 6为本发明实施例 1的终端移动中离网的流程图；
图 7为本发明实施例 1的终端移动中入网的流程图；
图 8为本发明实施例的终端移动切换接入设备的流程图；
图 9为本发明实施例的网络控制器的示意图；
图 10为本发明实施例的转发设备的示意图。
本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互任意组合。
图 2为本发明实施例的支持无线接入的控制与转发分离的 IP网络的示意 图， 即本发明实施例所使用的系统架构。 如图 2所示， 所述控制与转发分离 的 IP网络， 由两种子网组成： 由一台或多台网络控制器组成一个信令控制子 网， 以及网状相互连接的多台网络转发设备组成数据交换子网， 所述转发设 备指支持 SDN的各种交换设备， 包括支持 SDN的二、 三层交换机、 网关等。 信令控制子网即时计算用户的数据动态交换策略和流表， 并将交换策略和流 表发送给数据交换子网， 后者根据交换策略和流表转发用户数据。
AC为一种逻辑网元， 可独立部署， 也可集成在控制子网中。 它的主要功 能为用户身份认证与业务控制、 AP软硬件管理、 AP工作状态管理等功能。
终端的数据流由数据交换子网传送， 不经过 AC。
AP直接连接， 或通过简单二层交换机 (指不支持控制与转发分离的二层 交换机）连接到数据交换子网的交换机， 后者称作该 AP 的归属交换机（或 归属转发设备） 。
相关 WLAN系统终端入网离网的流程为： 终端加入 AP, 即入网时， 启 动身份认证流程； 终端离开 AP, 即离网时， WLAN终端可以按照 IEEE协议 规定主动发送离网信息， 对于相关一些 WLAN终端不发送离网信息的情况， 也可以通过诸如保活周期探测等方法判断其离网。
本发明实施例中，数据转发设备中维护 "本地 AP-归属转发设备对应表"， 网络控制器维护"全网 AP-归属交换机对应表"，表项至少包括字段： AP MAC, 转发设备网络标识， 最近加入时间。 上述表格可以通过静态配置， 也可以通 过动态配置进行维护， 例如：
全球厂商的 AP有专用 MAC地址段， 将 "厂商 AP MAC地址段表" 通 过预先配置或者动态下发的方式保存在网络控制器与数据转发设备上，例如， 通过网管系统下载给网络控制器， 再由网络控制器下发到其管理的转发设备 上。
数据转发设备根据其保存的厂商 AP MAC地址段表来匹配相应 MAC, 建立并维护 "本地 AP-归属转发设备对应表" ， 包括： 新发数据的 AP表项增 加， 非新发数据的 AP表项更新， 定长时间内无收发数据或强制删除的 AP表 项删除， 并向网络控制器发送相应上报信息。
网络控制器根据数据转发设备的上报信息进行 "全网 AP-归属转发设备 对应表" 的维护， 包括： AP表项增加、 更新与删除； 网络控制器也可根据策 略决定某 AP表项的删除， 并通知数据转发设备删除相应表项。
本实施例中的相关表结构及各字段如下：
"厂商 AP MAC地址段表" (转发设备与控制器中均包含） ：
AP MAC地址段 1、 厂商名称
AP MAC地址段 2、 厂商名称
"当前 MAC地址表" （转发设备中维护） ：
MAC地址 1、 最新活跃时间
MAC地址 2、 最新活跃时间
"本地 AP-归属转发设备对应表" （转发设备中维护） ：
AP MAC地址 1、 最新活跃时间
AP MAC地址 2、 最新活跃时间
"全网 AP-归属转发设备对应表" （控制器中维护） ： 转发设备网络标识 1、 AP MAC地址 1 (最新活跃时间） 转发设备网络标识 1、 AP MAC地址 2 (最新活跃时间 )
转发设备网络标识 2、 AP MAC地址 3 (最新活跃时间）
其中， "厂商 AP MAC地址段表" 可以通过预先配置或者动态下发的方 式保存在网络控制器与数据转发设备上， 例如， 通过预配置下载到网络控制 器与数据转发设备商， 或通过网管系统下载给网络控制器， 再由网络控制器 下发到其管理的转发设备上。 对于以下所有实施例， 默认网络控制器与所述 转发设备中已经保存了 "厂商 AP MAC地址段表" 。
终端入网或离网后， 信令控制子网以下面两种来源获得终端与其当前所 属 AP的信息， 信息至少包括： 终端网络标识、 AP网络标识， 还可以包括终 端与 AP的其它相关信息（例如， 终端及 AP的当前空口速率、 邻近 AP信息 等） ：
1) 由 AP汇报；
2) 由 AC汇才艮。
图 3为本发明一实施例的网络控制器侧业务处理方法的流程图， 如图 3 所示， 本实施例的方法包括： 步骤 11、 网络控制器获知终端离网后， 获取终端离网时的归属转发设备 的信息；
步骤 12、 网络控制器确定緩存策略流表， 将所述緩存策略流表发送给所 述归属转发设备。
图 4为本发明另一实施例的网络控制器侧业务处理方法的流程图， 如图 4所示， 本实施例的方法包括： 步骤 21、 网络控制器获知终端切换后， 获取所述终端切换前的归属转发 设备信息和所述终端当前的归属转发设备信息；
步骤 22、 网络控制器确定转发策略， 计算从所述终端切换前的归属转发 设备到所述终端当前的归属转发设备的转发路径； 步骤 23、 网络控制器为所述终端切换前的归属转发设备生成用以向当前 的归属转发设备转发緩存数据的转发流表， 并向所述终端切换前的归属转发 设备和所述转发路径上的转发设备下发所述转发流表。
图 5为本发明实施例的转发设备侧业务处理方法的流程图，如图 5所示， 本实施例的方法包括：
步骤 31、 转发设备接收网络控制器下发的緩存策略流表， 根据所述緩存 策略流表緩存指定终端的下行数据。
步骤 32、 转发设备接收所述网络控制器下发的转发流表， 根据所述转发 流表将緩存的所述下行数据转发给指定的转发设备。
本实施例中， 终端离网时， 信令控制子网查找 "全网 AP-归属转发设备 对应表" 中离网消息中 AP的对应的归属转发设备， 获得离网 AP所对应的归 属转发设备信息。 信令控制子网通知终端的离网 AP 归属转发设备， 称为前 属转发设备， 所述前属转发设备将緩存该终端的下行数据。 緩冲池的大小、 进出策略、 溢出策略等， 不在本专利之内。
本实施例中， 终端入网时， 信令控制子网查找 "全网 AP-归属转发设备 对应表" 中入网消息中 AP的对应的归属转发设备， 获得入网 AP所对应的归 属转发设备（称为现归属转发设备）信息。 信令控制子网计算有关此终端的 上下行转发策略与路径， 生成相关转发流表， 并下发给数据交换子网中该转 发路径上的各转发设备， 所述各转发设备更新转发流表， 从而使得在终端移 动后上下行数据及时正确地送达。 同时， 信令控制子网通知前归属转发设备 将终端离线期间緩存的下行数据转发到现归属转发设备。
下面以具体实施例对本发明的业务处理进行详细的说明。
图 6为本发明实施例 1的终端移动中离网的流程图， 其中 API为终端的 无线接入设备， AC为 AP控制器， 归属转发设备 1是 API的归属转发设备， 该场景为终端从 API离网， 如图 6所示， 包括以下步骤：
401、 终端或 API启动离网流程， 终端向 API发送离网信息；
402a, AC通知网络控制器终端离网信息， 该信息包括离网标识、 终端网 络标识、 AP网络标识、 以及终端与 AP的其它相关信息； 或通过 402b步骤， 402b, API通知网络控制器终端离网信息， 该信息包括终端网络标识、 AP网络标识、 以及终端与 AP的其它相关信息；
403、 网络控制器根据终端离网信息中的 AP MAC查找 "全网接入设备- 归属转发设备对应表" 中 AP的对应的归属转发设备， 获得离网 AP所对应的 归属转发设备 1。
网络控制器可以根据预配置策略、 网络状态和 /或用户签约信息等信息确 定转发 /緩存策略； 保存 /更新终端离网设备信息， 包括： 离网标识、 终端网络 标识， 接入设备 API MAC, 归属转发设备 1网络标识；
404、 网络控制器下发緩存策略流表更新给归属转发设备 1 ;
405、 归属转发设备 1更新转发策略 /流表， 緩存发往该终端的下行数据。 緩冲池的大小、 进出策略、 溢出策略等， 不在本专利范围内。
图 7为本发明实施例 1的终端移动中入网的流程图。 终端从无线接入设 备 API切换到 AP2, AC为 AP控制器， 归属转发设备 1是 API的归属转发 设备， 归属转发设备 2是 AP2的归属转发设备， 该场景为终端移动后从 AP2 入网， API与 AP2的归属转发设备不相同， 如图 7所示， 包括以下步骤：
501、 终端切换到 AP2并完成身份认证；
502、 AP2将终端入网信息通知网络控制器， 该信息包括入网标识、 终端 网络标识、 AP2网络标识、 以及终端与 AP2的其它相关信息， 例如， 终端及 AP2的当前空口速率、 邻近 AP信息等； 该入网信息可以由 AP2直接通知网 络控制器， 见 502a步骤， 也可以由 AC通知网络控制器， 即 502b步骤；
503、网络控制器才艮据终端入网信息中的终端网络标识查找终端离网设备 的信息， 获得归属转发设备 1信息， 网络控制器根据终端入网信息中的 AP2 MAC在 "全网接入设备-归属转发设备对应表" 中找到 AP2的对应的归属转 发设备 2;
网络控制器确定转发策略， 计算转发路径， 生成转发流表； 在本实施例 中， 网络控制器可以根据预配置策略、 网络状态和 /或用户签约信息等信息确 定转发策略， 为归属转发设备 2和路径（该路径是指终端切换到 AP2之后对 外通信的路径）上的相关转发设备 N生成转发流表； 计算从归属转发设备 1 到归属转发设备 2的转发路径， 为归属转发设备 1生成通知转发緩存数据的 转发流表， 为该路径上的相关转发设备 M生成转发流表， （N和 M均可以 为 0个， 1个或多个， 网络控制器为每个受控的转发设备生成一张流表） ； 网络控制器可保存该终端入网设备信息 (包括： 终端网络标识、 接入 AP信 息 AP2 MAC、 归属转发设备网络标识） ， 并删除该终端离网设备信息；
504、 网络控制器下发策略 /转发流表给归属转发设备 2及相关转发设备
N;
504a, 归属转发设备 2及相关转发设备 N更新流表；
505、 网络控制器下发流表给相关转发设备 M;
505a, 相关转发设备 M更新流表；
506、 网络控制器下发通知转发緩存数据的转发流表给归属转发设备 1 ; 506a, 归属转发设备 1更新流表；
507、 归属转发设备 1向归属转发设备 2转发緩存的终端的下行数据， 如 中间存在相关转发设备 M, 则数据通过相关转发设备转发至归属转发设备 2。
图 8为本发明实施例的终端移动切换接入设备的流程图。 该实施例中， 终端从无线接入设备 API切换到 AP2, AC为 AP控制器， 归属转发设备 1 是 API的归属转发设备， 也是 AP2的归属转发设备， 终端移动前后的无线接 入设备 API与 AP2的归属转发设备相同， 如图 8所示， 包括下面步骤：
601、 终端或 API启动离网流程， 终端向 API发送离网信息；
602、 API或 AC通知网络控制器终端离网信息， 该信息包括离网标识、 终端网络标识、 API网络标识、 以及终端与 API的其它相关信息；
603、 网络控制器根据终端离网信息中的 API MAC查找 "全网接入设备 -归属转发设备对应表" 中 API的对应的归属转发设备， 获得离网 AP所对应 的归属转发设备 1。
网络控制器可以根据预配置策略、 网络状态和 /或用户签约信息等信息确 定转发 /緩存策略； 保存 /更新终端离网设备信息， 包括： 离网标识、 终端网络 标识， 接入无线设备 API MAC, 归属转发设备 1网络标识； 604、 网络控制器下发緩存策略流表更新给归属转发设备 1；
605、 归属转发设备 1更新转发策略 /流表， 緩存发往该终端的下行数据。 緩冲池的大小、 进出策略、 溢出策略等， 不在本专利范围内。
606、 终端切换到 AP2并完成身份认证；
607、 AP2或 AC将终端入网信息通知网络控制器，该信息包括入网标识、 终端网络标识、 AP2网络标识、 以及终端与 AP2的其它相关信息， 例如， 终 端及 AP2的当前空口速率、 邻近 AP信息等；
608、网络控制器才艮据终端入网信息中的终端网络标识查找终端离网设备 信息，获得归属转发设备 1信息，网络控制器根据终端入网信息中的 AP2 MAC 在 "全网接入设备-归属转发设备对应表"中找到 AP2的对应的归属转发设备 1 ;
该实施例中， API与 AP2的归属转发设备相同。 网络控制器为归属转发 设备 1更新策略 /转发流表； 网络控制器可保存该终端入网设备信息 (包括： 终端网络标识、 接入 AP信息 AP2 MAC、 归属转发设备网络标识） ， 并删除 该终端离网设备信息；
609、 网络控制器下发转发策略 /流表给归属转发设备 1 ;
610、 归属转发设备 1更新流表；
611、 归属转发设备 1将緩存的终端的下行数据转发给 AP2。
如 AP与归属转发设备不是直连的情况， 转发还会通过其它底层交换设 备， 为本领域技术人员都熟知的相关技术， 与此发明无关不再累述。
在例如上述实施例 403、 503与 603步骤中， 网络控制器还可以根据策略 配置和设定修改归属转发设备緩存数据的时长及大小， 并可以在 404、 504、 604或 609步骤中通知受控转发设备进行緩存配置的修改。 緩冲池的大小、 进出策略、 溢出策略等， 不在本专利范围内。
图 9为本发明实施例的网络控制器的示意图， 如图 9所示， 本实施例的 网络控制器 900包括：
第一模块 901 , 其设置成获知终端离网后， 获取终端离网时的归属转发 设备的信息； 确定緩存策略流表， 将所述緩存策略流表发送给所述归属转发 设备；
第二模块 902 , 其设置成获知终端切换后， 获取所述终端切换前的归属 转发设备信息和所述终端当前的归属转发设备信息； 确定转发策略， 计算从 所述终端切换前的归属转发设备到所述终端当前的归属转发设备的转发路 径； 为所述终端切换前的归属转发设备生成用以向当前的归属转发设备转发 緩存数据的转发流表， 并向所述终端切换前的归属转发设备和所述转发路径 上的转发设备下发所述转发流表。
其中， 所述第一模块 901通过如下方式获取终端离网时的归属转发设备 的信息： 在维护的全网接入设备与归属转发设备对应表中， 查找所述终端离 网时的接入设备的媒体接入控制地址对应的归属转发设备。
其中， 所述第二模块 902通过如下方式获取所述终端切换前的归属转发 设备信息： 根据所述终端的网络标识查找所述终端的离网设备信息， 从所述 终端的离网设备信息中获取所述终端切换前的归属转发设备信息； 获取所述 终端当前的归属转发设备信息包括： 在维护的全网接入设备与归属转发设备 对应表中， 查找所述终端入网信息中的接入设备的媒体接入控制地址对应的 归属转发设备信息。
在一较佳实施例中， 所述网络控制器还可以包括：
第三模块 903 , 其设置成保存或更新所述终端的离网设备信息， 所述终 端的离网设备信息包括： 离网标识、 所述终端的网络标识、 所述终端离网时 的接入设备信息和归属转发设备的网络标识； 用于保存或更新所述终端的入 网设备信息并删除所述终端的离网设备信息，所述终端的入网设备信息包括： 所述终端的网络标识、 接入设备信息和归属转发设备网络标识。
图 10为本发明实施例的转发设备的示意图， 如图 10所示， 本实施例的 转发设备 1000包括：
第一模块 1001 , 其设置成接收网络控制器下发的緩存策略流表， 根据所 述緩存策略流表緩存指定终端的下行数据；
第二模块 1002, 其设置成接收所述网络控制器下发的转发流表， 根据所 述转发流表将緩存的所述下行数据转发给指定的转发设备。 本发明实施例提出了一种在控制与转发分离的 IP 网络架构中支持
WLAN终端移动性的方法， 数据转发设备和网络控制器分别维护本地与全网 的接入设备与归属转发设备对应表， 信令控制子网获得终端离网消息， 查找 "全网接入设备-归属转发设备对应表" 中离网 AP对应的归属转发设备， 生 成緩存策略， 下发策略 /流表消息给离网 AP的归属转发设备刷新转发策略， 使得所述离网 AP 归属的转发设备及时緩存该终端的下行数据（由终端发往 网络侧的数据称作上行数据， 反之称作下行数据） ； 信令控制子网获得该终 端入网消息， 查找 "全网接入设备-归属转发设备对应表" 中入网 AP对应的 归属转发设备， 计算更新路径生成转发表， 下发策略 /流表消息通知离网 AP 归属转发设备将緩存的终端数据转发给入网 AP归属转发设备， 下发策略 /流 表消息至入网 AP 的归属转发设备与数据交换子网中更新路径上的各转发设 备， 更新该设备数据的上下行转发路径， 进而保持业务连续。
这样， 单一的承载网络便可转发数据并支持 IP移动， 避免了叠加另一套 网络协议来支持 IP移动（如 MIP/PMIP等协议） ， 更与控制与转发分离等网 络架构无缝整合。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
以上仅为本发明的较佳实施例， 当然， 本发明还可有其他多种实施例， 在不背离本发明精神及其实质的情况下， 熟悉本领域的技术人员当可根据本 发明作出各种相应的改变和变形， 但这些相应的改变和变形都应属于本发明 所附的权利要求的保护范围。 工业实用性
本发明实施例提供一种业务处理方法、 网络控制器及转发设备， 在控制 与转发分离的 IP网络架构下， 一种 WLAN终端切换到新的一个无线接入设 备后， 能够保持业务的连续性。

Claims

权 利 要 求 书
1、 一种业务处理方法， 包括：
网络控制器获知终端离网后， 获取终端离网时的归属转发设备的信息； 以及
所述网络控制器确定緩存策略流表， 将所述緩存策略流表发送给所述归 属转发设备。
2、 如权利要求 1所述的方法， 其中， 所述网络控制器获取终端离网时的 归属转发设备的信息， 包括：
所述网络控制器在维护的全网接入设备与归属转发设备对应表中， 查找 所述终端离网时的接入设备的媒体接入控制地址对应的归属转发设备。
3、 如权利要求 1或 2所述的方法， 其中， 所述网络控制器获取终端离网 时的归属转发设备的信息之后， 还包括：
所述网络控制器保存或更新所述终端的离网设备信息， 所述终端的离网 设备信息包括： 离网标识、 所述终端的网络标识、 所述终端离网时的接入设 备信息， 以及对应的归属转发设备的网络标识。
4、 一种业务处理方法， 包括：
所述网络控制器获知终端切换后， 获取所述终端切换前的归属转发设备 信息和所述终端当前的归属转发设备信息；
所述网络控制器确定转发策略， 计算从所述终端切换前的归属转发设备 到所述终端当前的归属转发设备的转发路径； 以及
所述网络控制器为所述终端切换前的归属转发设备生成用以向当前的归 属转发设备转发緩存数据的转发流表， 并向所述终端切换前的归属转发设备 和所述转发路径上的转发设备下发所述转发流表。
5、 如权利要求 4所述方法， 其中： 所述网络控制器获取所述终端切换前 的归属转发设备信息， 包括：
所述网络控制器根据所述终端的网络标识查找所述终端的离网设备信 息，从所述终端的离网设备信息中获取所述终端切换前的归属转发设备信息。
6、 如权利要求 4所述方法， 其中： 所述网络控制器获取所述终端当前的 归属转发设备信息， 包括：
所述网络控制器在维护的全网接入设备与归属转发设备对应表中， 查找 所述终端入网信息中的接入设备的媒体接入控制地址对应的归属转发设备信 息。
7、 如权利要求 4所述方法， 其中： 所述网络控制器获取所述终端切换前 的归属转发设备信息和所述终端当前的归属转发设备信息之后， 还包括： 所述网络控制器保存或更新所述终端的入网设备信息并删除所述终端的 离网设备信息， 所述终端的入网设备信息包括： 所述终端的网络标识、 接入 设备信息， 以及归属转发设备网络标识。
8、 一种网络控制器， 包括：
第一模块， 其设置成获知终端离网后， 获取终端离网时的归属转发设备 的信息； 确定緩存策略流表， 将所述緩存策略流表发送给所述归属转发设备； 以及
第二模块， 其设置成获知终端切换后， 获取所述终端切换前的归属转发 设备信息和所述终端当前的归属转发设备信息； 确定转发策略， 计算从所述 终端切换前的归属转发设备到所述终端当前的归属转发设备的转发路径； 为 所述终端切换前的归属转发设备生成用以向当前的归属转发设备转发緩存数 据的转发流表， 并向所述终端切换前的归属转发设备和所述转发路径上的转 发设备下发所述转发流表。
9、 如权利要求 8所述的网络控制器， 其中，
所述第一模块通过如下方式获取终端离网时的归属转发设备的信息： 在维护的全网接入设备与归属转发设备对应表中， 查找所述终端离网时 的接入设备的媒体接入控制地址对应的归属转发设备。
10、 如权利要求 8所述的网络控制器， 其中，
所述第二模块通过如下方式获取所述终端切换前的归属转发设备信息： 根据所述终端的网络标识查找所述终端的离网设备信息， 从所述终端的离网 设备信息中获取所述终端切换前的归属转发设备信息； 以及 所述第二模块通过如下方式获取所述终端当前的归属转发设备信息： 在 维护的全网接入设备与归属转发设备对应表中， 查找所述终端入网信息中的 接入设备的媒体接入控制地址对应的归属转发设备信息。
11、 如权利要求 8所述的网络控制器， 还包括：
第三模块， 其设置成保存或更新所述终端的离网设备信息， 所述终端的 离网设备信息包括： 离网标识、 所述终端的网络标识、 所述终端离网时的接 入设备信息， 以及归属转发设备的网络标识； 以及
保存或更新所述终端的入网设备信息并删除所述终端的离网设备信息， 所述终端的入网设备信息包括： 所述终端的网络标识、 接入设备信息， 以及 归属转发设备网络标识。
12、 一种业务处理方法， 包括：
转发设备接收网络控制器下发的緩存策略流表； 以及
所述转发设备根据所述緩存策略流表緩存指定终端的下行数据。
13、 如权利要求 12所述的方法， 其中， 所述转发设备根据所述緩存策略 流表緩存指定终端的下行数据之后， 还包括：
所述转发设备接收所述网络控制器下发的转发流表； 以及
所述转发设备根据所述转发流表将緩存的所述下行数据转发给指定的转 发设备。
14、 一种转发设备， 包括：
第一模块， 其设置成接收网络控制器下发的緩存策略流表， 根据所述緩 存策略流表緩存指定终端的下行数据； 以及
第二模块， 其设置成接收所述网络控制器下发的转发流表， 根据所述转 发流表将緩存的所述下行数据转发给指定的转发设备。
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