WO2007131404A1 - Méthode et dispositif de transfert rapide - Google Patents

Méthode et dispositif de transfert rapide Download PDF

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Publication number
WO2007131404A1
WO2007131404A1 PCT/CN2007/000580 CN2007000580W WO2007131404A1 WO 2007131404 A1 WO2007131404 A1 WO 2007131404A1 CN 2007000580 W CN2007000580 W CN 2007000580W WO 2007131404 A1 WO2007131404 A1 WO 2007131404A1
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Prior art keywords
tunnel
par
nar
mobile node
address
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PCT/CN2007/000580
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English (en)
Chinese (zh)
Inventor
Hongfei Chen
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0019—Control or signalling for completing the hand-off for data sessions of end-to-end connection adapted for mobile IP [MIP]

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method and apparatus for implementing fast handover in Mobile IPv6 (IP Version 6-IP Vers ion 6).
  • the basic principle of the Mobi le I P technology is to enable the mobile node to always use the initial IP address for IP communication during the mobile process, so as to ensure that the upper layer applications carried by the IP network layer maintain uninterrupted and continuable mobility.
  • IPv6 technology will gradually replace the current IPv4 (IP version 4-IP Version technology) based on its huge address space.
  • IPv6-based Mobi le IP namely Mobile IPv6 (Mobi le IPv6) technology
  • Mobi le IPv6 Mobile IPv6
  • the home link and the foreign link are connected to the Internet through the home gateway and the foreign gateway respectively.
  • the mobile node ( ⁇ -Mobi le Node) is a communication node that can move from one network to another on the Internet and can keep the communication uninterrupted, and can communicate with the node as long as it knows the home address of the node.
  • a CN-Correspondence Node is a peer-to-peer node that is communicating with a mobile node, which can be mobile or fixed.
  • a home agent (HA-Home Agent) is a router that has a port connected to the home link of the mobile node. When the mobile node moves to the foreign link, it will be responsible for intercepting those sent to the mobile node. The packet of the home address is then forwarded to the mobile node using the tunneling mechanism and processes the current location information of the maintained mobile node.
  • Home Link refers to the default link of the mobile node and also the link with the same network prefix as the home address of the mobile node (such as the home IP address).
  • a foreign link refers to a link other than the home link whose network prefix is different from the network prefix of the mobile node's home address (such as the home IP address).
  • Care-of Address is the relevant IP address obtained when the mobile node moves to the foreign link.
  • a mobile node can have multiple care-of addresses at the same time.
  • Step 101 When the mobile node connects to its home link, it will work in the same way as other fixed nodes.
  • the mobile node is assigned an address on the home link, called the Home Address. This address is permanently assigned to this node, the same address as the fixed node.
  • the mobile node moves, its home address does not change.
  • Mobile IPv6 include a global unicast home address and network-local home address.
  • Step 102 The mobile node detects whether it has roamed to the foreign link through the IPv6 neighbor discovery mechanism.
  • the IPv6 foreign gateway periodically sends a router advertisement message, which includes the prefix of the foreign link. After receiving the router advertisement message of the foreign gateway, the mobile node checks that the prefix of the foreign link is different from the prefix of the home link. It is considered to have roamed to the foreign link.
  • Step 103 If the mobile node finds that it has moved to the foreign link, it will obtain the relevant IP address on the foreign link through the stateful or stateless address auto-configuration process based on the received router announcement information. , called the care-of address (CoA-Care-of Addres s). At this time, the mobile node has both the home address and the care-of address.
  • the care-of address CoA-Care-of Addres s
  • Step 104 The mobile node registers its own care-of address with the "Binding Update" message to the home agent.
  • the mobile node can also notify the communication partner of this care-of address through the "Binding Update” message registration.
  • the Return Routabi ty (return route reachable) detection process needs to be performed between the mobile node and the communication partner, that is, the mobile node first sends the Home Ini t Tes t message and the handover initialization test (Care- of Ini t Test ) message to the communication partner, the latter handles After that, return Home Tes t (Home Test) message and Care-of Tes t (Transfer Test) message to the mobile node.
  • Step 105 According to the object registered by the "Binding Update" message, the data packet is delivered in the following two forms:
  • the mobile node's communication partner If the mobile node's communication partner does not know its care-of address, it will send the data packet to the mobile node's home link according to the mobile node's home address, and then its home agent will intercept the data packet, and then according to the mobile node's current The care-of address, using the tunneling mechanism to forward these packets to the mobile node.
  • the message sent by the mobile node to the communication partner is also sent to the home agent through the reverse tunnel, and then forwarded to the communication partner by the home agent.
  • the communication partner knows the mobile node's care-of address through the "binding update"
  • it will use the IPv6 routing header to directly transmit the packet to the mobile node.
  • the first destination address of the packet is the handover address
  • the second destination address is the home address. Therefore, the data packet will be sent directly to the mobile node in the foreign link, without the need to transit through the home agent.
  • the source address of the packet sent by the mobile node to the communication partner is the care-of address, and the home address is stored in the destination extension header of the packet.
  • the data packet can also be sent to the home agent without going through the reverse tunnel, but sent directly to the communication partner.
  • the "triangular routing” mode is called the "route optimization” mode.
  • NAR New Acces s Router, access router for the mobile link
  • the central idea of the above existing fast switching method is to get the phase in advance before the "binding update"
  • the information of the neighboring network generates the IP address of the neighboring network. Once the behavior of moving to the neighboring network occurs and the binding update is completed, a tunnel is established between the PAR and the MN to keep the traffic constant. See Figure 3 for the network structure.
  • the network before the MN is moved is referred to as the network to which the PAR belongs, and the access router of the network is the PAR; the network after the MN is moved is referred to as the network to which the NAR belongs, and the access router of the network is the NAR.
  • Step 201 The MN sends an RtSolPr (Router Sol Authenticate for Proxy Advertisement) message to the PAR to request information about the neighboring network NAR.
  • the timing of sending an RtSolPr message can be when an ND (Neighbor Di scover) message is sent.
  • Step 202 The PAR responds to the PrRtAdv (PrRtAdv: Proxy Router Advertisement), and the response message includes information about the neighboring network (that is, the network to which the NAR belongs), where the related information of the neighboring network includes at least Neighbor network access router (ie MR) information.
  • PrRtAdv Proxy Router Advertisement
  • MR Neighbor network access router
  • Step 203 If the returned neighbor network related information does not support fast handover, the fast handover process is terminated. If the returned neighbor network related information supports fast handover, the MN prepares to move to the NAR to generate the NCoA.
  • Step 204 When the MN is about to move to the NAR, send an FBU (Fass t Binding Update) message to the PAR.
  • FBU Fess t Binding Update
  • Step 205 After receiving the FBU message, the PAR binds the PCoA and the NCoA, and then sends the HI (Handover).
  • Step 206 After receiving the HI, the NAR replies with a hack (Handover Acknowledge) message to confirm its legality.
  • a hack Hawover Acknowledge
  • Step 207 The PAR returns a FBack (Fassing Binding Acknowledge) message to the MN and the NAR, and then saves the mapping relationship between the NCoA and the PCoA, establishes a PAR to the MN tunnel, and redirects the CN to the traffic to the tunnel.
  • FBack Fessing Binding Acknowledge
  • Step 208 After the connection between the PAR and the PAR is moved to the NAR, before the binding update is completed, the NCoA is used as the source IP address, and the CN considers that the packet is illegal, and the PCoA is an illegal address in the network to which the NAR belongs. .
  • the following operations are performed separately: a) The traffic sent by the MN to the CN is encapsulated in the tunnel.
  • the IP address of the inner IP header is PCoA
  • the destination address is the CN address
  • the source IP address of the outer IP address is NCoA
  • the destination address is the PAR address.
  • PAR ⁇ will map the source address NCoA and PCoA. It knows that the message is a tunnel, removes the outer IP header, and forwards it to the CN with the inner IP header.
  • the IP header source address is the CN address
  • the destination address is PCoA.
  • the PAR encapsulates the packet according to the mapping between the NCoA and the PCoA.
  • the source IP address of the outer IP address is the PAR address and the destination address is the NCoA address.
  • Step 209 After the binding update of the MN is completed, both the read and the PAR delete the tunnel.
  • the MN then uses NCoA to communicate directly with the CN.
  • step 207, 208 the tunnel is established between the PAR and the MN to ensure that the traffic before the NCoA binding update is completed, but the tunnel between the MN and the PAR is only after the MN moves to the network to which the NAR belongs.
  • the MN is valid before the NCoA binding update is completed.
  • the tunnel lifetime is very short. In a short period of time, the router's control module sends tunnel establishment and cancellation messages to the forwarding module.
  • An object of the embodiments of the present invention is to provide a method and apparatus for implementing fast handover. After a mobile node moves to a new network and before a binding update is completed, the router does not need to generate a large number of temporary tunnels with a large number of MNs, so that packet transmission can be implemented. .
  • An embodiment of the present invention provides a method for implementing fast handover, where the method includes: establishing a static tunnel between an access router PAR of a mobile front link and an access router N AR of a mobile link, before the moving The link is a first link, and the mobile link is a second link; after the mobile node moves from the first link to the second link, before the binding update is completed, the PAR and the NAR are passed The static tunnel between the two transmits the message related to the mobile node.
  • An embodiment of the present invention provides a device for implementing fast handover, where the device includes a tunnel establishment module and a transmission module, where The tunnel establishment module is configured to establish a static tunnel between the access router PAR of the mobile front link and the access router NAR of the mobile link, where the mobile front link is the first link, and the mobile chain is The road is the second link;
  • the transmitting module is configured to pass the static tunnel between the PAR and the NAR to the mobile node after the mobile node moves from the first link to the second link, before the binding update is completed.
  • the message is transmitted.
  • the embodiment of the present invention since a static tunnel is established between the mobile forward link access router and the mobile link link access router, the related mobiles before all binding updates are completed are completed.
  • the packet transmission of the node can be performed through the tunnel, and a large number of tunnel establishment and cancellation messages do not occur.
  • the embodiment of the present invention provides The technical solution can greatly improve the efficiency of the router.
  • FIG. 1 is a network topology diagram of a mobile IPV6 in the prior art
  • FIG. 3 is a topology diagram of a mobile node access network in the prior art
  • FIG. 5 is a flowchart of a method for implementing fast handover according to an embodiment of the present invention.
  • FIG. 6 is a structural diagram of an apparatus for implementing fast switching according to an embodiment of the present invention.
  • the embodiment of the present invention provides a method for implementing fast switching.
  • FIG. 5 it is a flowchart of a fast handover method according to an embodiment of the present invention, which includes the following steps:
  • Step 301 A static tunnel is established between the PAR and the NAR.
  • the tunnel is established for a long time and does not need to be frequently established or deleted.
  • the static tunnel can adopt various technologies, such as an IP tunnel, an IPSEC tunnel, an MPLS tunnel, and the like. As long as you move from the same PAR to the same NAR, no matter how many, Both use the static tunnel forwarding traffic between the same PAR and NAR.
  • the source address encapsulated in the packet transmitted from the PAR to the NAR through the static tunnel is the PAR address, and the destination address is the NAR address.
  • the source address encapsulated in the packet transmitted from the NAR through the static tunnel to the PAR is NAR address, destination address is PAR address.
  • Step 302 Establish a mapping relationship of the mobile node on the PAR and the NAR before the mobile node binds the update, and the content of the mapping relationship includes a mobile forward care-of address PCoA, a mobile link care-of address NCoA, and a Information about NAR and PAR at both ends of the tunnel.
  • the specific steps are as follows: A) the mobile node sends a request message to the NAR through the PAR in the network to which the PAR belongs, and the NAR sends a response to the mobile node by using the PAR, where the response carries the address information of the NAR, and the mobile node
  • the NCoA is generated according to the address information of the NAR.
  • the PAR can also obtain the NAR address information from other servers. After the mobile node sends a request message to the PAR, the PAR can inform the mobile node of the MR address information obtained from other servers, and the mobile node generates the NAR address information according to the NAR address information. NCoA.
  • the mobile node when the mobile node is about to move to the network to which the NAR belongs, the mobile node sends a request message including the NCoA to the PAR, and after receiving the request message, the PAR sends a request to the NAR to confirm whether the NCoA address is legal.
  • a legality request message where the legality request message carries a mapping relationship between the PCoA, the NCoA, the NAR address information, and the PAR address information; the NAR address information and the PAR address information may be respective IP addresses, or may be able to find The port address to the IP address.
  • the NAR 0 after the NAR receives the legality request message requesting the validity of the request, the NAR
  • the PAR sends a validity confirmation message confirming the validity, and establishes a mapping relationship between the PCoA, the NCoA, the NAR address information, and the PAR address information.
  • the PAR establishes a mapping relationship between the PCoA, the NCoA, the NAR address, and the PAR address after receiving the validity confirmation message.
  • mapping relationship corresponding to each MN is shown in Table 1:
  • MN1 10. 2. 2. 0 10. 1. 1. 0 10. 1. 0. 0 10. 2. 0. 0
  • Step 303 After the foregoing mapping relationship is established, before the mobile node moves to the network to which the NAR belongs, before the binding update is completed, the mobile node and the PAR/NAR perform the setting of the inner layer IP address according to the mapping relationship. The packet is encapsulated and transmitted through a static tunnel between the NAR and the PAR. Perform the following steps based on the different flows of the packets:
  • the MN1 in Table 1 is taken as an example.
  • the packet encapsulated by the tunnel is called a tunnel packet, and is not encapsulated by the tunnel or has been decapsulated by the tunnel.
  • the message is called an ordinary message.
  • Step al ⁇ 1 does not tunnel the ordinary message to be sent to the communication partner.
  • the source IP address is NCoAlO. 1. 1.
  • the destination address is the CN address, and then sent.
  • Step a2 The ordinary message first arrives at the NAR, and the source address and the destination address of the original message are used as the inner layer address, that is, the source IP address of the inner layer IP header is NCoAl O. 1. 1. 0, and the destination address is CN.
  • the outer IP header of the tunnel packet is also The NAR address is 10. 1. 0. 0, and the destination address is PAR address 10. 2. 0. 0. 0.
  • Step a3 After receiving the tunnel message, the PAR performs tunnel decapsulation to obtain an inner layer IP header source address NCoAl O. 1. 1. 0, and the destination address is a CN address, and the PCoA and NCo A in the mapping table are used.
  • the mapping relationship converts the inner IP address source address NCoAl O. 1. 1. 0 into PCoAl O. 2. 2. 0, and sends the decapsulated ordinary packet to the CN.
  • the NAR can also refer to the IP header source address of the common message NCoAlO. 1. 1. 0 to check the mapping table to obtain the corresponding PCoAl O. 2. 2. 0, using PCoAl O. 2. 2 0. Replace NCoAl O. 1. 1. 0 as the inner IP header source address, the inner IP header destination address is the destination address CN address of the packet, and then tunnel the packet according to the packet. IP address source address NCoAlO. 1. 1. 0 look up the mapping table to get the PAR address 10, 2. 0. 0, and set the outer IP header source address to NAR address 10. 1. 0. 0, destination address set The PAR address is 10. 2. 0. 0. In this way, in the above step a3, after the PAR receives the tunnel packet and performs tunnel decapsulation to obtain the inner layer IP header, the PAR does not need to perform IP header address processing, and can directly send the packet to the CN.
  • Step bl The ordinary 4 ⁇ message sent by CN to MN2, whose source address is CN address, and the destination address is PCoAlO. 4. 2. 0.
  • Step b2 After the traffic reaches the PAR, the PAR uses the source address and the destination address of the packet as the inner address, that is, the source IP address of the inner layer is the CN address, and the destination address is PCoAl O. 4. 2. 0.
  • the PAR passes the packet destination address PCoAl O. 4. 2.
  • Q finds the corresponding NAR address in the mapping relationship table, and encapsulates the packet in the tunnel.
  • the outer IP header source address is PAR address 10. 4. 0. 0
  • the destination address is the NAR address 10. 3. 0. 0.
  • the encapsulated tunnel packet is sent to the NAR through a static tunnel between the PAR and the NAR.
  • Step b3 After receiving the tunnel message, the NAR performs tunnel decapsulation to obtain an ordinary packet whose inner IP address is a CN address and whose destination address is PCoAl O. 4. 2. 0, according to the purpose of the packet. Address PCoAl O. 4. 2. 0 Check the mapping relationship between PCoA and NCoA saved in the mapping table to get NCoAl O. 3. 1. 0, and set NCoAlO, 3. 1. 0 as the address of the inner IP header. Only sent to MN2. The relationship is corresponding to NCoAl O. 3. 1. 0, the inner IP header address is set to NCoAl O. 3. 1. 0, the inner IP header source address is set to the CN address, and the PAR passes the document.
  • the address NCoA finds the address of the MR in the mapping table, and the packet is encapsulated in the tunnel.
  • the source IP address of the outer IP address is 10.4, 0, and the destination address is the NAR address 10. 3. 0.
  • the tunnel message is then sent to the MN2 through the tunnel.
  • the NAR performs tunnel decapsulation to obtain an inner layer IP header, and does not need to perform IP header address processing, but can directly send the packet to ⁇ 2.
  • the method for implementing the fast handover according to the embodiment of the present invention further includes: after the completion of the binding update, the message is sent to notify the PAR and the MR, and the PAR and the NAR delete the mapping relationship between the PCoA and the NCoA.
  • a message can be customized during the implementation process. As long as PAR and NAR know that Li has completed the binding update, PAR and NAR will forward the traffic packets related to the ⁇ in the normal way. Therefore, the MN can only announce the completion of the binding update to the PAR and the NAR. As to whether the mapping relationship between the PCoA and the NCoA is deleted by the PAR and the NAR, the MN can be selected according to the specific situation.
  • the aging mechanism of the mapping relationship between the NAR and the PAR is required. After a certain mapping is established, the mapping is not deleted by the packet for a certain period of time.
  • the present invention also provides a fast switching device.
  • a schematic embodiment of the present invention provides a structural apparatus to achieve fast switching, in general terms, the apparatus comprising a tunnel establishing module 61 and transmitting module 62, wherein, the delivery module 62 comprises establishing mapping sub Module 6, tunnel processing submodule 622 and forwarding sub-module 623.
  • the delivery module 62 comprises establishing mapping sub Module 6, tunnel processing submodule 622 and forwarding sub-module 623.
  • the tunnel establishment module 61 is configured to establish a static tunnel between the access router PAR of the mobile front link and the access router NAR of the mobile link.
  • the mobile front link is the first link. After the mobile link is the second link.
  • the transmitting module 62 is configured to transmit a message related to the mobile node by using a static tunnel between the PAR and the MR after the mobile node moves from the first link to the second link and before the binding update is completed.
  • the mapping establishment sub-module 621 establishes a mapping relationship with the mobile node on the PAR and the NAR before the mobile node binding update, where the mapping relationship is specifically the mobile node's mobile forward care-of address PCoA, mobile The post-link care-of address NCoA and the mapping relationship between the NAR and PAR address information at both ends of the tunnel.
  • the tunnel processing sub-module 622 encapsulates/decapsulates the packets entering and leaving the static tunnel based on the mapping relationship of the mobile node after the mobile node moves to the second link and before the binding update is completed.
  • the tunnel processing submodule 622 specifically includes a NAR side tunnel processing unit and a PAR side tunnel processing unit.
  • the NAR side tunnel processing unit uses the NAR address information and the PAR address information as the outer tunnel head to perform tunnel encapsulation on the received common message with the mobile node NCoA as the IP address source address of the temple port; or
  • the PAR tunnel packet is tunnel decapsulated.
  • the PAR side tunnel processing unit is configured to use the PAR address information and the NAR address information as the tunnel header for tunnel encapsulation of the received common packet with the mobile node PCoA as the destination address, or tunnel the tunnel packet from the NAR. Decapsulation.
  • a scheme is: the NAR-side tunnel processing unit replaces the sub-unit with the first address of the NAR side included, and based on the mapping relationship between the mobile node NCoA and the PCoA, the source IP address of the ordinary packet before the tunnel encapsulation is performed.
  • the NCoA is replaced with the corresponding PCoA;
  • the PAR-side tunnel processing unit replaces the sub-unit with the first address of the PAR side included therein, and based on the mapping relationship between the mobile node PCoA and the NCoA, the purpose of the ordinary packet before the tunnel encapsulation is performed.
  • the IP address PCoA is replaced with the corresponding NCoA.
  • the PAR side tunnel processing unit replaces the subunit by the second address of the PAR side included therein, and based on the mapping relationship between the mobile node NCoA and the PCoA, the source of the ordinary packet after the tunnel decapsulation is performed.
  • NAR side tunnel The channel processing unit replaces the sub-unit with the NAR-side second address included in the channel, and replaces the destination IP address PCoA of the ordinary packet after the tunnel decapsulation with the corresponding NCoA based on the mapping relationship between the mobile node NCoA and the PCoA.
  • the message processed by the tunneling sub-module 622 is then forwarded by the forwarding sub-module 623.
  • the forwarding submodule 623 specifically includes a tunnel forwarding unit and a regular forwarding unit.
  • the tunnel forwarding unit tunnels the tunnel packet encapsulated by the tunnel processing sub-module 622 to the other party through the static tunnel between the PAR and the NAR; the conventional forwarding unit performs tunnel decapsulation on the tunnel processing sub-module 622.
  • the subsequent ordinary message is forwarded according to the inner IP header information obtained after decapsulation.
  • the device further includes a mapping deletion module, where the mapping deletion module is configured to delete the mapping relationship between the PAR and the mobile node established on the NAR after the mobile node is bound to the update.
  • the mapping deletion module may not immediately delete the mapping relationship about the mobile node, as long as the PAR and the NAR are prohibited from using the mapping relationship after the mobile node binding update, for example, the mapping deletion module identifies the mapping relationship as prohibited or invalid. , it will not affect the normal message processing after the binding update.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé qui permet de réaliser un transfert rapide. Elle comprend l'établissement d'un tunnel statique entre PAR et NAR le précédent lien mobile étant appelé premier lien et le nouveau lien mobile étant appelé second lien. Avant de réaliser la mise à jour de liaison et après avoir déplacé le noeud mobile (MN) du premier au second lien, le message concernant le MN est transmis de PAR à NAR par le tunnel statique. Un dispositif permettant de réaliser ce transfert rapide fait partie de cette invention. Dans cette invention, toutes les transmissions de messages impliquant le MN pourraient être réalisées dans un seul tunnel statique avant de réaliser les mises à jour de liaison, il n'y a ni établissement de tunnels ni apparition de messages annulés et l'on évite la création de nombreux tunnels temporaires. En outre l'efficacité des routeurs est améliorée.
PCT/CN2007/000580 2006-05-15 2007-02-16 Méthode et dispositif de transfert rapide Ceased WO2007131404A1 (fr)

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CN113098751A (zh) * 2021-03-23 2021-07-09 新华三软件有限公司 一种路径切换方法及设备
CN116996587A (zh) * 2023-09-25 2023-11-03 北京持安科技有限公司 一种分布式sdp隧道控制方法及设备

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CN103037350B (zh) * 2011-09-29 2017-03-22 中兴通讯股份有限公司 一种在pmip域间漫游时的节点通信方法及通信系统
CN102655476B (zh) * 2012-04-19 2014-11-05 华为技术有限公司 一种互联网协议流转发方法，及设备
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