WO2009006825A1 - Procédé de transfert, procédé pour rejoindre un groupe de multidiffusion et routeur d'accès dans le protocole proxy mobile ip - Google Patents

Procédé de transfert, procédé pour rejoindre un groupe de multidiffusion et routeur d'accès dans le protocole proxy mobile ip Download PDF

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Publication number
WO2009006825A1
WO2009006825A1 PCT/CN2008/071520 CN2008071520W WO2009006825A1 WO 2009006825 A1 WO2009006825 A1 WO 2009006825A1 CN 2008071520 W CN2008071520 W CN 2008071520W WO 2009006825 A1 WO2009006825 A1 WO 2009006825A1
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WO
WIPO (PCT)
Prior art keywords
multicast
multicast group
join
home agent
access router
Prior art date
Application number
PCT/CN2008/071520
Other languages
English (en)
Chinese (zh)
Inventor
Zhigang Huang
Xia Qin
Yangsong Xia
Original Assignee
Huawei Technologies Co, .Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co, .Ltd. filed Critical Huawei Technologies Co, .Ltd.
Publication of WO2009006825A1 publication Critical patent/WO2009006825A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/24—Interfaces between hierarchically similar devices between backbone network devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1863—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports
    • H04L12/1877—Measures taken prior to transmission
    • 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
    • H04L45/16—Multipoint routing
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • 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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/182—Network node acting on behalf of an other network entity, e.g. proxy

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a handover method in a proxy mobile IP (Internet Protocol), a multicast joining method, and an access router.
  • a proxy mobile IP Internet Protocol
  • a multicast joining method and an access router.
  • MN Mobile Node
  • HoA Home Address
  • CN Corresponding Node
  • CoA Care-of Address
  • the CoA is registered to the HA (Home Agent). After the HA receives the registration, the packet is encapsulated and the inner packet is unchanged.
  • the source address of the outer document is the address of the HA.
  • the destination address is CoA, and the HA will be encapsulated.
  • the subsequent message is forwarded to the MN.
  • the MN When the MN sends a packet, it uses the CoA to send the packet.
  • the source address of the outer layer is CoA
  • the destination address is the address of the HA
  • the source address of the inner layer is HoA
  • the destination address is the address of the CN.
  • the HA receives the packet.
  • the packet is decapsulated and the inner packet is forwarded to the CN. This mode of communication is called bidirectional tunnel mode.
  • the Proxy Mobile IPv6 ( ⁇ ) protocol is an extension of Mobile IPv6. Unlike Mobile IPv6, it uses AR (Access Router) to simulate the home link and announces the home prefix to the MN, so that the MN thinks that it is always The home link; the AR sends a registration message to the HA instead of the MN, and the care-of address uses the interface address of the AR. Finally, a bidirectional tunnel is established between the AR and the HA to transmit the MN message.
  • the process of sending and receiving packets includes: The peer communication node sends a message to the home address of the mobile node, and the message is intercepted by the home agent, and then the home agent queries the binding list according to the home address, and then passes between the home agent and the AR.
  • the tunnel sends the packet to the AR for processing.
  • the AR sends the packet to the mobile node according to the destination address of the packet.
  • the AR receives the packet and passes the AR.
  • the tunnel between the agent and the home agent sends the message to the home agent, and the home agent strips the outer IP packet header. Layer messages are sent directly to the peer communication node.
  • the scheme for the home registration to join the multicast group is as shown in the following figure.
  • the MN wants to join the specific multicast group, the MN notifies the HA to join the multicast group.
  • the HA joins the multicast group through the multicast routing protocol.
  • the multicast data packet from the multicast source is first forwarded to the home network, and then the HA in the home network is unicast to the MN through the tunnel.
  • the MN when the MN wants to join a specific multicast group, the MN sends a group member to join the message.
  • the AR of the access network joins the multicast group through the multicast routing protocol.
  • the multicast data is sent to the MN in a multicast manner by the AR of the access network.
  • the routing of data packets needs to go through the home agent.
  • the path of the packet is not optimal, and the home agent is easy to become a bottleneck, which affects the reliability of the service. Therefore, the prior art proposes an improved scheme for the mobile IPv4 home registration mode, so that the multicast data message is not copied by the home agent, but is replicated in the foreign agent, which reduces the impact of the multicast transmission on the home agent.
  • the format of the message used is as shown in Figure 2, including: FAA (Foreign Agent Address), Home (Home Agent Address), and original multicast data packet, original multicast datagram.
  • the text includes the destination address, source address, and data.
  • the specific process of the solution includes: sending an IGMP (Internet Group Management Protocol) message to the FA (Foreign Agent) in the foreign MN, and the FA sends a message to the HA of the MN to notify the HA to join the multicast.
  • IGMP Internet Group Management Protocol
  • the FA Form Agent
  • the FA sends a message to the HA of the MN to notify the HA to join the multicast.
  • the HA After receiving the multicast data from the multicast source, the HA encapsulates and unicasts the multicast data to each MN's FA.
  • the HA performs IP-in-IP on the multicast data packet. Encapsulated before the original IP header, the destination address is the FA address, and the source address is the HA address. In this way, the copying of the multicast data is not performed in the HA, but in the FA.
  • the FA sends the multicast data packet after decapsulation, so that the MN in the foreign area receives the multicast data packet.
  • the above two multicast group joining methods can be applied.
  • the MN does not have the mobility detection and management function, and the HA does not exist, only the Remote Subscribe method can be applied.
  • the MN sends the MLD (Multicast Listener Discovery) protocol report to the local AR to join the multicast group.
  • MLD Multicast Listener Discovery
  • the destination AR does not actively provide the multicast service to the MN after the handover.
  • the HA does not forward the packet to the destination AR, and the MN cannot receive the multicast data packet.
  • the HA forwards the multicast data packet to the MN that joins the multicast group according to the "Which MN has joined the multicast group" to forward the multicast data packet.
  • the HA will send the multicast data packet to the source AR until the destination AR replaces the MN to complete the registration process with the HA. In this process, the MN also Unable to receive multicast data packets.
  • the embodiment of the present invention provides a handover method in a proxy mobile IP, a multicast join method, and an access router, so as to effectively reduce the loss of multicast data packets in the process of proxy mobile IP handover.
  • the embodiment of the invention provides a handover method in proxy mobile IP, including: Receiving a handover request message from a source access router;
  • a report message is sent to the home agent to enable the home agent to join the multicast group through the multicast routing protocol.
  • the embodiment of the present invention further provides a method for joining a multicast group in a proxy mobile IP, including:
  • a multicast join request is sent to the home agent to enable the home agent to join the multicast group through the multicast routing protocol.
  • the present invention also provides an access router in a proxy mobile IP, comprising: a message receiving unit, configured to receive a handover request message from a source access router; a multicast group joining unit, and the message receiving unit A connection is used to join the mobile node to a multicast group.
  • the invention also provides an access router in the proxy mobile IP, comprising: a request receiving unit, configured to receive a multicast join request from the mobile node, and obtain the mobile node multicast information;
  • the multicast group joining unit is configured to send a report message to the home agent for the home agent to join the multicast group through the multicast routing protocol.
  • the source AR when the MN moves across the AR, notifies the destination AR of the multicast group information that the MN joins through signaling interaction, and the destination AR does not need to re-initiate registration with the HA to continue to the MN.
  • the multicast service is provided to reduce the handover delay and the loss of multicast data packets during the handover.
  • Figure la is a schematic diagram of a hometown registered in a multicast group in the prior art
  • FIG. 2 is a schematic diagram of a message format of a remote subscriber joining a multicast group in the prior art
  • FIG. 2 is a schematic diagram of a packet format used by a home subscriber to join a multicast group in the prior art
  • FIG. 3 is a schematic diagram of a MN cross-AR mobile scenario in the embodiment of the present invention
  • FIG. 4 is a flowchart of a method for switching a proxy mobile IP in an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a package format of a multicast data packet sent by a HA according to an embodiment of the present invention
  • FIG. 6 is a structural diagram of an access router in a proxy mobile IP according to an embodiment of the present invention
  • FIG. 7 is a flow chart of a multicast joining method in a proxy mobile IP according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a method for determining whether to join a multicast group locally or join a multicast group through a foreign link in the example of the present invention
  • FIG. 9 is a structural diagram of an access router in another proxy mobile IP according to an embodiment of the present invention. detailed description
  • the first embodiment of the present invention provides a handover method in proxy mobile IP, which is applied to a MN cross-AR mobile scenario.
  • MN2 switches from AR1 to AR2. Since MN2 does not feel the mobility of the IP layer, The multicast group join message is not re-initiated. In this case, AR2 and AR1 are required to perform signaling interaction to complete the join process of the multicast group.
  • the switching method is shown in Figure 4 and includes the following steps:
  • Step s401 The destination access router AR2 receives the handover request message from the source access router AR1.
  • the source access router AR1 finds that its controlled MN2 keeps moving, and will leave its control range. When it reaches the control range of AR2, it sends a handover request message to AR2, which carries the multicast group address that MN2 joins.
  • the handover request message may be: context transmission signaling (defined in RFC4067), fast handover signaling like FMIP (defined in RFC4068), or custom message in wireless technology, such as WiMAX (Worldwide Interoperability for Microwave Access, microwave) Access to the ASN (Access Service Network) mobility handover function in the global interworking.
  • Step s402 The AR2 records the multicast group information of the mobile node, and sends a report message to the HA, that is, sends a Report (MLD) to the HA through the tunnel, and requests to join the multicast group.
  • MLD Report
  • Step s403 The home agent joins the multicast group by using a multicast routing protocol.
  • Join multicast After the group is configured, the HA receives the multicast data sent by the multicast source, and forwards the multicast data to the AR2 through the PMIPv6 tunnel between the AR2 and the HA.
  • the AR2 decapsulates the multicast data and then forwards the packet to the AR2.
  • Different MNs According to different access technologies, the AR2 can use the multicast mode or the unicast mode when sending the message to the MN.
  • the multicast mode can be used for the Ethernet and the unicast mode can be used for the wireless network.
  • the encapsulation format of the multicast data sent by the HA includes: an AR address, an HAA, and an original multicast data packet.
  • the original multicast data packet further includes a destination address, a source address, and data.
  • a judging step may be further included: determining whether the AR or the HA joins the multicast group. If the local join mode is used, the AR2 uses the multicast group routing protocol to directly join the multicast group, and all the multicast services are performed by the AR2. The AR2 receives the multicast data packet and forwards it to the MN. If the HA joins the multicast group, go to step s402.
  • the judgment criteria include: one or more of a user policy, a multicast group policy, a distance between the access router and the home agent, and an access router and a home agent link quality.
  • An embodiment of the present invention provides an access router in a proxy mobile IP, which is applied to a MN cross-AR mobile scenario.
  • the method includes: a message receiving unit 11 configured to receive a handover request from a source access router.
  • the multicast group joining unit 12 is connected to the packet receiving unit 11 and configured to join the mobile node to the multicast group.
  • the multicast data forwarding unit 13 is connected to the multicast group joining unit 12 for receiving the home agent.
  • the forwarded multicast data packet is decapsulated and sent to the corresponding mobile node.
  • the multicast information recording unit 14 is connected to the packet receiving unit 11 and configured to record the mobile node multicast information.
  • the multicast group joining unit 12 specifically includes: directly joining the sub-unit, and connecting to the packet receiving unit 11, for directly joining the multicast group by using the multicast group protocol; or indirectly joining the sub-unit, and connecting with the packet receiving unit 11 And sending a report message to the home agent for the home agent to join the multicast group through the multicast routing protocol.
  • the source AR when the MN moves across the AR, the source AR notifies the destination AR of the multicast group information that the MN joins through signaling interaction, and the destination AR can select how to provide the multicast service to the MN according to the policy, thereby reducing the handover process.
  • the loss of multicast data packets since the MN does not have the capability of mobility detection, the MN does not feel the existence of the HA. Therefore, the MN does not like the MN in the MIPv6, and can independently determine to join the multicast group to the HA through the bidirectional tunnel or directly A multicast group is added to the foreign link.
  • the embodiment of the present invention provides a multicast joining method in the proxy mobile IP. As shown in FIG. 7, the method includes the following steps:
  • Step s701 The access router receives a multicast join request from the mobile node, and the request may be a Report (MLD) message.
  • MLD Report
  • Step s702 The access router encapsulates the request message and sends it to a home agent, such as a Report (MLD) message, through a tunnel.
  • a home agent such as a Report (MLD) message
  • Step s703 The home agent joins the multicast group by using a multicast routing protocol.
  • the HA receives the multicast data sent by the multicast source, it can forward the data to the MN through the PMIPv6 tunnel between the AR and the HA.
  • the AR can use multicast or unicast mode when sending packets to the MN.
  • the multicast mode can be used for the Ethernet and the unicast mode can be used for the wireless network.
  • a judging step may be included to determine whether to join the multicast group through the AR or join the multicast group through the HA.
  • the specific process is as shown in FIG. 8, including:
  • Step s801 After receiving the multicast join request from the MN, the AR determines whether the access router supports multicast. If yes, go to step s802; otherwise, go to step s804.
  • step s802 it is determined whether the AR has joined the multicast group, and if it has been added, the process ends; if not, the process goes to step s803.
  • step s803 it is determined whether the AR joins the multicast group or joins the multicast group through the HA. If the HA joins the multicast group, the process proceeds to step s804. If the AR joins the multicast group, the process proceeds to step s805.
  • the determination on the AR can be implemented in the following manner: According to the MN request to join the multicast group, the AR joins the multicast group (Remote Subscription, referred to as the RS mode) or the HA joins the multicast group (Bi-directional Tunnel, BT for short) mode). Judging criteria include: user policy, multicast group policy, distance between access router and home agent, and quality of access router and home agent link Kind or several.
  • All multicast services are provided by the local AR, and the AR joins the corresponding multicast group; or all multicast services are provided by the HA, and the HA joins the corresponding multicast group; or the AR determines the user address.
  • AR is determined according to the multicast group address; or the AR determines according to the distance from the AR to the HA or the link quality; or the AR combines the above factors to determine.
  • Step s804 The AR notifies the HA to join the multicast group through the bidirectional tunnel.
  • Step s805 The AR joins the multicast group on the local AR through the multicast group routing protocol.
  • the present invention also provides an access router in the proxy mobile IP, which is applied to the multicast join field.
  • the method includes: a request receiving unit 21, configured to receive a multicast join request from the mobile node, and obtain a mobile Node multicast information;
  • the multicast group joining unit 22 is connected to the request receiving unit 21, and is configured to send a report message to the home agent, so that the home agent joins the multicast group through the multicast routing protocol; the multicast information recording unit 23, and the request
  • the receiving unit 21 is connected to record mobile node multicast information.
  • the functions of the access routers in Figures 6 and 9 can be integrated into one access router.
  • the embodiment of the present invention integrates the mechanisms of the HA joining the multicast group and the AR joining the multicast group to provide the multicast service, which can fully utilize the advantages of the two mechanisms, optimize the network performance, and provide better multicast. service.
  • the embodiment of the present invention is directed to the scenario of proxying mobile IPv6, but these technical solutions are also applicable to the scenario of proxying mobile IPv4, and only need to make corresponding modifications.
  • IGMP Internet Group Management Protocol
  • MLD Multicast Listener Discovery
  • the present invention can be implemented by hardware, or can be implemented by means of software plus necessary general hardware platform, and the technical solution of the present invention. It can be embodied in the form of a software product that can be stored in a non-volatile storage medium (In the case of a CD-ROM, a USB flash drive, a mobile hard disk, etc., a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.
  • a computer device which may be a personal computer, server, or network device, etc.

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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 de transfert dans le protocole proxy mobile IP, qui comprend les opérations suivantes : un message de requête de transfert est reçu en provenance du routeur d'accès source ; un message de rapport est envoyé à l'agent mère de sorte que l'agent mère rejoint le groupe de multidiffusion par le protocole de routage de multidiffusion. L'invention concerne aussi un procédé pour rejoindre le groupe de multidiffusion dans le protocole proxy mobile IP et un routeur d'accès. Lorsqu'un nœud mobile (MN) se déplace entre des routeurs d'accès (AR), l'AR primaire indique à l'AR cible les informations du groupe de multidiffusion que le MN a rejoint par signalisation, et l'AR cible peut sélectionner la façon de fournir le service de multidiffusion pour le MN sur la base d'une stratégie, de sorte que la perte de paquets de données de multidiffusion durant la procédure de transfert peut être réduite.
PCT/CN2008/071520 2007-07-06 2008-07-02 Procédé de transfert, procédé pour rejoindre un groupe de multidiffusion et routeur d'accès dans le protocole proxy mobile ip WO2009006825A1 (fr)

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Application Number Priority Date Filing Date Title
CN2007101228477A CN101068213B (zh) 2007-07-06 2007-07-06 代理移动ip中的切换方法、组播加入方法及接入路由器
CN200710122847.7 2007-07-06

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CN101068213B (zh) * 2007-07-06 2010-09-29 华为技术有限公司 代理移动ip中的切换方法、组播加入方法及接入路由器
CN101309225B (zh) * 2008-06-30 2011-11-23 中兴通讯股份有限公司 组播隧道优化方法、装置及系统
CN101729271B (zh) * 2008-10-27 2013-06-05 华为技术有限公司 一种维护组播组成员状态的方法、移动节点和系统
CN101516085B (zh) * 2009-03-24 2011-11-02 华为技术有限公司 一种路由规则更新方法、装置以及通信系统
CN102300241B (zh) * 2010-06-23 2014-11-05 中兴通讯股份有限公司 一种测量基站性能的方法和装置
CN105978812A (zh) * 2016-05-06 2016-09-28 北京邮电大学 一种报文转发方法及装置
CN115842771A (zh) * 2021-09-13 2023-03-24 中兴通讯股份有限公司 一种mesh组网下设备漫游处理方法及装置
CN117319689A (zh) * 2022-06-22 2023-12-29 中兴通讯股份有限公司 非签约内容提供商的服务资源分发方法和视频服务系统

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