WO2007028300A1 - A method for obtaining the home agent information of the mobile node and a system thereof - Google Patents

A method for obtaining the home agent information of the mobile node and a system thereof Download PDF

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Publication number
WO2007028300A1
WO2007028300A1 PCT/CN2006/001296 CN2006001296W WO2007028300A1 WO 2007028300 A1 WO2007028300 A1 WO 2007028300A1 CN 2006001296 W CN2006001296 W CN 2006001296W WO 2007028300 A1 WO2007028300 A1 WO 2007028300A1
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WO
WIPO (PCT)
Prior art keywords
home agent
mobile node
information
agent information
home
Prior art date
Application number
PCT/CN2006/001296
Other languages
English (en)
French (fr)
Inventor
Yuzhi Ma
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.
Priority to EP06752934A priority Critical patent/EP1933503A4/en
Publication of WO2007028300A1 publication Critical patent/WO2007028300A1/zh
Priority to US12/044,358 priority patent/US8213369B2/en

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Classifications

    • 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
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5007—Internet protocol [IP] addresses
    • H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • 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 network communication technologies, and in particular, to a method and system for acquiring home agent information of a mobile node.
  • DHCP Dynamic Host Configuration Protocol
  • DHCP Dynamic Host Configuration Protocol
  • DHCP is available in v4 (version 4) and v6 (version 6) versions for IPv4 and IPv6 networks.
  • DHCPv6 includes both stateful and stateless modes.
  • the stateful mode means that the terminal device obtains the IP address and other configuration information through DHCPv6.
  • the stateless mode means that the terminal device has obtained the IP through other methods or manual methods. In the case of an address, only state-independent information such as domain name resolution server information is obtained from the DHCPv6 server.
  • the MN mobile node
  • the MN can first obtain the home address through DHCP, and register the home address to the home agent.
  • the MN leaves the home link and arrives at the foreign link it can pass The stateless or stateful mode automatically obtains its care-of address, and then registers the care-of address with the home agent, after which the mobile node and the communication node can communicate through a bidirectional tunnel or route optimization mode. Therefore, the MN obtains relevant information such as the IP address of its home agent, which is the basis for subsequent communication by the MN.
  • MN does not know the home agent address or the home agent changes, that is, after the MN obtains the care-of address, it passes to the mobile IPv6.
  • the home agent discovery message is sent by any home address of the home agent, or the home agent discovery message is sent by broadcast in the mobile IPv4.
  • the home agent After receiving the discovery message, the home agent sends a response message to the MN, and the MN obtains the home agent from the response message. Address information.
  • the object of the present invention is to provide a method and a system for acquiring the home agent information of a mobile node, so that the mobile node can quickly and accurately obtain the home agent information, thereby improving the efficiency of obtaining the home agent information, improving the RFC, and improving the transfer speed of the mobile node. the goal of.
  • the present invention provides a method for obtaining home agent information of a mobile node, including:
  • DHCPv6 Dynamic Host Configuration Protocol Version 6
  • the DHCPv6 server carries the home agent information in a request response message and transmits the message to the mobile node.
  • the step a specifically includes -
  • the DHCPv6 server receives the request message of the mobile node, and obtains the home agent information of the mobile node according to the request message when the mobile node needs to obtain the home agent information in the determining the request message.
  • the mobile node needs to obtain the home agent information carried in the mobile option of the request message extension.
  • the mobile option includes: the mobile option that identifies the request message includes an option identifier that the mobile node needs to obtain the home agent information, an option length that identifies the mobile node's home/foreign link, and option data;
  • the request message includes a mobile node that needs to obtain home agent information, and when the mobile node is at home, the option identifier is a first predetermined value, the option length is a second predetermined value, and the option data is a third predetermined. Value
  • the request message includes a mobile node that needs to obtain home agent information, and when the mobile node is in a foreign link, the option identifier is a first predetermined value, the option length is a fourth predetermined value, and the option data is a mobile node. Home address information.
  • the method further includes -a' before the step a, setting the home agent information of the mobile node in the DHCPv6 server; And the step of obtaining the home agent information of the mobile node in the step a includes: a.
  • the DHCP server determines the home agent information of the mobile node that sends the request message according to the home agent information stored by the DHCP server and the request message received by the DHCP server.
  • the step a' specifically includes:
  • the correspondence between the home link and the home agent information is set according to the home link prefix information, and the home agent information corresponding to the home link is sorted according to the priority; and/or a2', in the DHCPv6 server.
  • the binding correspondence between the home address of the mobile node and the home agent information is set, and the home agent information bound to the home address is sorted according to the priority.
  • the step al specifically includes: '
  • the DHCPv6 server determines the link prefix of the request message it receives, and determines the home agent information matching the link prefix according to the home agent information stored by itself; or
  • the DHCPv6 server determines the home address information carried in the request message received by the DHCPv6 server, and determines the home agent information that matches the home address information according to the binding correspondence stored by the DHCPv6 server.
  • the home agent information in the step b is carried in the mobile option of the request response message extension.
  • the mobile option includes: an option identifier including the home agent information in the mobile option identifying the request response message, an option length identifying the length of the home agent information, and option data carrying the home agent information.
  • the step b further includes:
  • the DHCPv6 server determines the home agent information of the mobile node, and binds the home address information of the mobile node to the home agent information.
  • the home agent information includes: home agent address information.
  • the request message is: a request home address message based on the DHCPv6 stateful mode, or a request care-of address message based on the DHCPv6 stateful mode, or a request and status-independent information message based on the DHCPv6 stateless mode.
  • the present invention also provides a system for obtaining home agent information of a mobile node, including: a storage module, a DHCPv6 server, and a mobile node; and a storage module: storing home agent information of the mobile node;
  • the DHCPv6 server when receiving the request message transmitted by the mobile node, obtains the home agent information of the mobile node from the storage module, and carries the home agent information in the request response message and transmits the message to the mobile node.
  • the storage module is disposed in a DHCPv6 server.
  • the present invention utilizes a request message and a request response message between a mobile node and a DHCP (Dynamic Host Configuration Protocol) server, so that the mobile node can obtain the home agent information such as the hometown while requesting the corresponding information.
  • DHCP Dynamic Host Configuration Protocol
  • Proxy address information when the request message is a request home address message, enabling the mobile node to obtain the home agent information when the home link is started, and clarifying the process of obtaining the home agent information when the home link is started; when the request message is the request transfer
  • the mobile node can obtain its home agent information in the process of obtaining the care-of address, or other information, avoiding the message interaction process specially performed for obtaining the home agent information; Applicable to the mobile Ipv6 network and the mobile network; the method of the present invention is easily implemented by setting the home agent information of the mobile node in the DHCP; thereby improving the efficiency of obtaining the home agent information and improving the RFC by the technical solution provided by the present invention, improve Purpose mobile node care-speed.
  • FIG. 1 is a schematic diagram of a system for obtaining home agent information of a mobile node according to the present invention
  • FIG. 2 is a system for obtaining home agent information of a mobile node according to the present invention.
  • the core of the method and system of the present invention are: DHCPv6 (Dynamic Host Configuration Protocol Version 6)
  • DHCPv6 Dynamic Host Configuration Protocol Version 6
  • the server receives the request message of the MN (mobile node)
  • the server obtains the home agent information of the MN, and the home agent information obtained by the DHCPv6 server
  • the bearer is transmitted to the MN in the request response message.
  • the technical solution provided by the present invention is further described below based on the core idea of the present invention.
  • the method for obtaining the MN home agent information such as the home agent address information, may be applied to the mobile IPv6 network and the NEMO, respectively, and the MN of the present invention acquires the MN home address, acquires the MN care-of address, and acquires information irrelevant to the status, and the like.
  • Zhongdu is able to obtain MN home agent information at the same time.
  • the following takes the MN home agent address information as an example to describe the specific implementation method of the present invention in the stateful and stateless mode.
  • Method 1 In the mobile IPv6 network and NEMO, the method for obtaining the MN home agent information is implemented based on the stateful manner.
  • the MN when the MN needs to apply for information such as a home address or a care-of address to the DHCPv6,
  • the MN sends a DHCPv6-based request home address message, a request for a care-of address message, and the like to the DHCPv6 server.
  • the MN When the MN sends the request message, the MN needs to carry the information that the MN needs to obtain the home agent in the request message.
  • the information that the MN needs to obtain the home agent can be carried in the option of the above request message extension.
  • a mobile option OPTION_MOBILITY, OPTION-MOBILITY is added to the request message. It consists of three parts, the option-code, the option-len, and the option-data.
  • the DHCPv6 server When receiving the request message of the MN, and determining that the request message contains the mobile option that the MN needs to obtain the home agent information, the DHCPv6 server should obtain the home agent address information of the MN according to the content in the mobile option, and the home address of the MN.
  • the proxy address information is carried in the request response message and transmitted to the MN.
  • the request response message is a response message requesting a home address message, a response message requesting a care-of address message, and the like.
  • the DHCPv6 server obtains the home agent address information of the MN in various ways, such as obtaining from other network entities, obtaining information from its own preset storage, and the like.
  • the home agent address information is obtained from a network management system or other system (storage module) configured with information about the home agent address information, and is saved on the DHCPv6 server.
  • the home agent address information of the MN may be carried in the option of the request response message extension.
  • a mobile option OPTION_MOBILITY is added to the request response message, and OPTION_MOBILITY mainly includes three Part of the content, the option-code (option code), option-len (option length), and option-data (option data) fields.
  • IPv6 address I Home - Agent- Address 1 (IPv6 address) or
  • IPv6 address I Home-Agent- Address2 (IPv6 address)
  • the option-code is used to identify that the mobile message of the request message contains the MN needs to obtain the home agent information, that is, when the option identifier in the mobile option of the request message is
  • the predetermined value is 200, it indicates that the mobile option includes the MN needs to obtain the home agent information, and the selection of the first predetermined value needs to be organized to the relevant standard organization.
  • Option-len is used to identify the length of the option-data in the mobility option. It also identifies whether the MN is on the home link or in the foreign link. That is, when the option-len is the second predetermined value, such as 0, the MN is at home. On the link, at this time, the option-data in the mobility option should be the third predetermined value as empty; when the option-len is the fourth predetermined value, such as 16, the MN is on the foreign link, at this time, The option-data in the move option should be the home address information of the MN.
  • the option-code is used to identify the request response message.
  • the mobile option includes MN home agent information, that is, when the option option in the mobile option of the request response message is identified as When the first predetermined value is 200, it indicates that the mobile option includes MN home agent address information, and the selection of the first predetermined value needs to be applied to the relevant standard organization.
  • Option-len is used to identify the length of the option-data, that is, the length of the MN home agent information. The length value should be an integer multiple of 16 bytes; option-data is used to carry the MN home agent address information.
  • the DHCPv6 server pre-sets the home agent address information in the network, and the home agent address information can be organized and stored according to the link prefix of the home link. If there are multiple home agent address information on the home link, the address information of each home agent is given. Set a priority and prioritize them into a list of home agent addresses.
  • the option-code in the home address message is set to 200, the option-len is set to 0, the option-data is set to null, and then the request home address is sent. Message.
  • the option-len is 0.
  • the MN wants to obtain an IP address with a long lease period and use it as a home address.
  • the DHCPv6 server receives the requesting home address message of the MN, and returns an IP address with a long lease period to the MN as the home address of the MN.
  • the DHCPv6 server needs to determine the prefix of the sending link of the request home address message (determining the prefix of the link is
  • the standard method defined in the DHCPv6 protocol is mainly formed by intercepting the corresponding bit from the IPv6 address in front of the link prefix length, where the prefix length information is usually set in the DHCPv6 request message, and is stored from itself according to the prefix of the sending link.
  • the home agent address list determines the matching entry, and the home agent address information in the entry is carried in the option-code field in the OPTION-MOBILITY requesting the home address response message, and the home agent address in the option-code field Information can be prioritized. Then, the option-code in the OPTION_MOBILITY requesting the home address response message is set to 200, and the option-len is the length of the home agent address information in the option-code field, and the length is an integer multiple of 16 bytes.
  • the DHCPv6 server binds the home address of the MN to the home agent address information sent to the MN.
  • the MN receives the request home address response message, and selects a home agent as the MN from the home agent address information carried by the option-code in the OPTION_MOBILITY of the response message of 200.
  • the MN When the MN applies for the care-of address through the DHCPv6 server, the MN sets the option-code in the request-through address message to 200, sets the option-len to 16, and sets the option-data. Set the MN's home address information, and then send the request to the address message.
  • Option-len is 16 Description] VIN is in the foreign link.
  • the DHCPv6 server receives the request care-of address message of the MN, and returns a request care-of address response message carrying the care-of address information to the MN.
  • the DHCPv6 server obtains its hometown from the option-data in the OPTION_MOBILITY of the request-coded address message with the option-code of 200 in the request to the care-of address message with the option-len of OPTION-MOBILITY of 200.
  • the address information determines the home agent address information of the MN from the information of the MN home address and the MN home agent address information according to the obtained home address information, and carries the MN home agent address information in the OPTION_MoBILITY requesting the home address response message.
  • the home agent address information in the option-code field can be prioritized. Then, the option-code in the OPTION_MOBILITY requesting the care-of address response message is set to 200, and the option-len is the length of the home agent address information in the option-code field, and the length is an integer multiple of 16 bytes.
  • the MN receives the request handover address response message, and selects a home agent as the MN from the home agent address information carried by the option-code in the OPTION_MOBILITY of the response message of 200.
  • Method 2 In the mobile IPv6 network and EMO, the method for obtaining the MN home agent information is implemented based on the stateless mode.
  • the second method is basically the same as the method in the first method.
  • the request message sent by the MN to the DHCPv6 server is not a request for a home address message, nor a request for a care-of address message, but a message requesting status-independent information.
  • Information-request message is not a request for a home address message, nor a request for a care-of address message, but a message requesting status-independent information.
  • Information-request message is a Reply message.
  • the information-request message and the Reply message both contain the mobile option OPTION_MOBILITY, and the correspondence between the home link and the home agent address information established according to the link prefix stored in the DHCPv6 server is the home agent address information list and the home address.
  • the information binding information of the home agent address information, the setting of the mobile option in the request message, and the setting of the mobile option in the request response message are basically the same as those described in the method 1.
  • step 1-1 the MN applies to the DHCPv6 server through the home link and the status is not For the information, set the OPTION_MOBILITY option-code in the Information-request message to 200, the option-len to 0, the option-data to null, and then send the information request message.
  • step 1-1 if the MN applies status-independent information to the DHCPv6 server through the foreign link, set the OPTION_MOBILITY option-code in the Information-request message to 200, and set the option-len to 16.
  • the option-data is set to the home address of the MN, and then the information request message is sent.
  • the DHCPv6 server receives the information request message of the MN, and returns the information requested by the MN to the MN.
  • the DHCPv6 server needs to determine the sending link of the information request message, and the hometown stored according to the prefix of the sending link. The matching table entry is determined in the proxy address list.
  • the DHCPv6 server needs to obtain the home address information of the MN from the option-data of OPTION-MOBILITY, and the home address information stored from itself.
  • the home agent address information corresponding to the MN home address information is determined in the information bound to the home agent address.
  • the DHCPv6 server carries the MN home agent address information in the option-code field in the OPTION_MOBILITY of the information request response message, and the home agent address information in the option-code field can be arranged according to the priority.
  • the option-code in the OPTION_MOBILITY of the DHCPv6 server setting information request response message is 200
  • the option-len is the length of the home agent address information in the option-code field, and the length is an integer multiple of 16 bytes.
  • the MN receives the information request response message, and selects one of the home agent address information carried by the option-code in the OPTION_MOBILITY of the response message of 200 as its home agent.
  • the system for obtaining the home agent information of the mobile node provided by the present invention mainly includes a mobile node and a DHCPv6 server as shown in FIG. 2.
  • the mobile node sends the request information to the DHCPv6 server to request the home agent information, and then the DHCPv6 server obtains the home agent information of the mobile node according to the request message transmitted by the mobile node, and carries the home agent information in the request response message. Transfer to the mobile node.
  • the system for obtaining the home agent information of the mobile node may further include a storage module (not shown), wherein the storage module is provided with the home agent address information in the network, and the home agent address information may be based on the chain of the home link.
  • the road prefix is used to organize the storage, and the home agent address information may be stored in the form of a home agent address information list, and the home agent address information may be bound and stored with the home address information of the MN when the MN obtains the home agent address information by requesting the home address message. Specifically, it is described in the above method.
  • the storage module is the network management system as described above or other system configured with information about the home agent address information.
  • the storage module in the present invention can also be directly disposed in the DHCPv6 server.
  • the DHCPv6 server may determine the prefix of the MN home link according to the link of the transmission request message, and then, according to the prefix and The home agent address information list stored by itself determines the home agent address information of the MN; the DHCPv6 server may also be based on the information carried in the option-code field in the OPTION_MOBILITY of the option-code of 200 and the option-len of 16 in the request message.
  • Determining the home address information of the MN and then determining the home agent address information of the MN according to the binding information of the home address information and the home agent address information stored in the storage module, and transmitting the MN home agent address information in the request response message to the MN. Specifically, it is as described in the above method.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)
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Description

一种获取移动节点家乡代理信息的方法和系统 技术领域
本发明涉及网络通讯技术领域， 具体涉及一种获取移动节点家乡代理信 息的方法和系统。
背景技术
DHCP (动态主机配置协议） 为主机提供一种动态指定 IP地址和其他配 置参数的机制， 在主机位置经常变动的网络中， DHCP用于动态分配、 管理 主机的 IP地址及相关参数。当主机加入网络时，可以动态地从网络中的 DHCP 服务器处获取 IP地址等参数， 自动建立其与其他主机通信的渠道。
DHCP分 v4 (版本 4) 和 v6 (版本 6) 两个版本， 分别运用于 IPv4网络 和 IPv6网络。 DHCPv6包括有状态和无状态两种方式， 其中， 有状态方式是 指终端设备通过 DHCPv6同时获取 IP地址和其他配置信息，无状态方式是指 在终端设备已经通过其他方式或手工方式等获得了 IP 地址的情况下， 仅从 DHCPv6服务器处获取一些与状态无关的信息如域名解析服务器信息等。
在移动 IP网络和 NEMO (移动网络）中， MN (移动节点）可以通过 DHCP 方式首先获取家乡地址， 并将家乡地址注册到家乡代理上， 当 MN离开家乡 链路到达外地链路时， 可以通过无状态或有状态方式自动获得其转交地址， 然后将该转交地址注册到家乡代理上， 之后移动节点和通信节点之间可以通 过双向隧道或路由优化模式进行通信。 因此， MN获取其家乡代理的 IP地址 等相关信息， 是 MN进行后续通信的基础。
目前， RFC (Request For Comments—请求注解） 中定义的获取家乡代理 地址的方法为： MN在不知道家乡代理地址或者家乡代理发生变化的情况下， 即在 MN获取转交地址后，通过向移动 IPv6家乡代理的任意点播地址发送家 乡代理发现消息， 或在移动 IPv4中通过广播方式发送家乡代理发现消息， 家 乡代理接收到发现消息后， 向 MN发送应答消息， MN从应答消息中获取其 家乡代理的地址信息。
RFC中仅定义了 MN获取转交地址后， 通过家乡代理发现消息获取家乡 代理地址信息的方法， 没有明确定义在家乡链路启动时， MN获取其家乡代 理地址信息的方法， 而且， 在 MN获取转交地址后， MN需要和家乡链路进 行较多的消息交互才能够获得家乡代理的地址信息，不利于 MN的转交速度。 发明内容
本发明的目的在于，提供一种获取移动节点家乡代理信息的方法和系统, 使移动节点能够快速准确的获得其家乡代理信息， 实现了提高家乡代理信息 获取效率、 完善 RFC、 提高移动节点转交速度的目的。
为达到上述目的，本发明提供的一种获取移动节点家乡代理信息的方法, 包括：
a、 DHCPv6 (动态主机配置协议版本 6) 服务器接收到移动节点的请求 消息时， 获取该移动节点的家乡代理信息；
b、 DHCPv6服务器将所述家乡代理信息承载于请求响应消息中传输至所 述移动节点。
所述步骤 a具体包括-
DHCPv6 服务器接收到移动节点的请求消息、 并在确定请求消息中承载 有移动节点需要获取家乡代理信息时， 根据所述请求消息获取该移动节点的 家乡代理信息。
所述移动节点需要获取家乡代理信息承载于请求消息扩展的移动选项 中。
所述移动选项包括： 标识请求消息的该移动选项中包含有移动节点需要 获取家乡代理信息的选项标识、 标识移动节点在家乡 /外地链路的选项长度和 选项数据；
所述请求消息中包含有移动节点需要获取家乡代理信息、 且移动节点在 家乡链路时， 所述选项标识为第一预定值、 选项长度为第二预定值、 所述选 项数据为第三预定值；
所述请求消息中包含有移动节点需要获取家乡代理信息、 且移动节点在 外地链路时， 所述选项标识为第一预定值、 选项长度为第四预定值、 所述选 项数据为移动节点的家乡地址信息。
所述方法在步骤 a之前还包括- a'、 在 DHCPv6服务器中设置移动节点的家乡代理信息； 且所述步骤 a中获取该移动节点的家乡代理信息的步骤具体包括： al、 DHCP服务器根据其自身存储的家乡代理信息、 其接收的请求消息 确定发送请求消息的移动节点的家乡代理信息。
所述步骤 a'具体包括：
al\在 DHCPv6服务器中根据各家乡链路前缀信息设置各家乡链路与家 乡代理信息的对应关系、 且家乡链路对应的家乡代理信息根据优先级排序； 和 /或 a2'、 在 DHCPv6服务器中设置移动节点的家乡地址与家乡代理信 息的绑定对应关系、 且与家乡地址绑定的家乡代理信息根据优先级排序。
所述步骤 al具体包括： '
DHCPv6 服务器确定其接收请求消息的链路前缀， 并根据其自身存储的 家乡代理信息确定与该链路前缀匹配的家乡代理信息； 或
DHCPv6 服务器确定其接收的请求消息中承载的家乡地址信息， 并根据 其自身存储的绑定对应关系确定与所述家乡地址信息匹配的家乡代理信息。
所述步骤 b中的家乡代理信息承载于请求响应消息扩展的移动选项中。 所述移动选项包括： 标识请求响应消息的该移动选项中包含有家乡代理 信息的选项标识、 标识家乡代理信息长度的选项长度和承载家乡代理信息的 选项数据。
所述步骤 b还包括：
DHCPv6服务器中在向移动节点发送家乡地址信息时， 确定移动节点的 家乡代理信息， 并将移动节点的家乡地址信息与家乡代理信息绑定存储。
所述家乡代理信息包括： 家乡代理地址信息。 所述请求消息为： 基于 DHCPv6有状态方式的请求家乡地址消息、 或基于 DHCPv6有状态方式的请 求转交地址消息、 或基于 DHCPv6无状态方式的请求与状态无关信息消息。
本发明还提供一种获取移动节点家乡代理信息的系统， 包括： 存储模块、 DHCPv6服务器和移动节点； 存储模块： 存储有移动节点的家乡代理信息；
DHCPv6服务器： 接收到移动节点传输来的请求消息时， 从存储模块中 获取该移动节点的家乡代理信息， 并将所述家乡代理信息承载于请求响应消 息中传输至移动节点。
所述存储模块设置于 DHCPv6服务器中。 通过上述技术方案的描述可知， 本发明利用移动节点与 DHCP (动态主 机配置协议） 服务器之间的请求消息、 请求响应消息， 使移动节点能够在请 求相应信息的同时， 获得其家乡代理信息如家乡代理地址信息； 当请求消息 为请求家乡地址消息时， 使移动节点能够在家乡链路启动时获得其家乡代理 信息， 明确了家乡链路启动时获得家乡代理信息的过程； 当请求消息为请求 转交地址消息、 请求与状态无关信息的消息时， 移动节点能够在获得转交地 址、 或其它信息的过程中获得其家乡代理信息， 避免了为获取家乡代理信息 而专门进行的消息交互过程；本发明能够适用于移动 Ipv6网络和移动网络中； 通过在 DHCP中设置移动节点的家乡代理信息， 使本发明的方法易于实现； 从而通过本发明提供的技术方案实现了提高家乡代理信息获取效率、 完善 RFC, 提高移动节点转交速度的目的。
附图说明
图 1是本发明的获取移动节点家乡代理信息的系统示意图； 以及 图 2是依照本发明获取移动节点家乡代理信息的系统。
具体实施方式
本发明的方法和系统的核心均为： DHCPv6 (动态主机配置协议版本 6) 服务器接收到 MN (移动节点） 的请求消息时， 获取该 MN的家乡代理信息， DHCPv6 服务器将其获取的家乡代理信息承载于请求响应消息中传输至该 丽。
下面基于本发明的核心思想对本发明提供的技术方案做进一步的描述。 本发明获取 MN家乡代理信息如家乡代理地址信息的方法， 可分别适用 于移动 IPv6网络和 NEMO中， 且本发明的 MN在获取 MN家乡地址、 获取 MN转交地址、 获取与状态无关的信息等过程中都能够同时获得 MN家乡代 理信息。
下面以获取 MN家乡代理地址信息为例， 对在有状态、 无状态方式中本 发明的具体实现方法进行描述。
方法一、 在移动 IPv6 网络、 NEMO 中， 基于有状态方式实现获取 MN 家乡代理信息的方法。
本方法中， MN在需要向 DHCPv6申请家乡地址或转交地址等信息时， MN向 DHCPv6服务器发送基于 DHCPv6的请求家乡地址消息、 请求转交地 址消息等请求消息， MN在发送这些请求消息时，需要在请求消息中携带 MN 需要获取家乡代理的信息。
MN需要获取家乡代理的信息可以承载于上述请求消息扩展的选项中， 如在基于 DHCPv6的请求消息的基本报文格式的基础上， 在请求消息中增加 一个移动选项 OPTION—MOBILITY, OPTION— MOBILITY主要包括三部分内 容， 即 option-code (选项代码）、 option-len (选项长度）和 option-data (选项 数据） 字段。
DHCPv6服务器在接收到 MN的请求消息，并确定请求消息中包含有 MN 需要获取家乡代理信息的移动选项时，应根据该移动选项中的内容，获取 MN 的家乡代理地址信息， 并将 MN的家乡代理地址信息承载于请求响应消息中 传输至 MN。 请求响应消息如请求家乡地址消息的响应消息、 请求转交地址 消息的响应消息等。
DHCPv6服务器获取 MN的家乡代理地址信息的方法有多种， 如从其它 网络实体中获取、 从其自身预先设置存储的信息中获取等。 其中， 例如从网 管系统或其他配置了家乡代理地址信息相关信息的系统 （存储模块） 中获取 家乡代理地址信息， 并保存在 DHCPv6服务器上。
MN 的家乡代理地址信息可以承载于上述请求响应消息扩展的选项中， 如在基于 DHCPv6的请求响应消息的基本报文格式的基础上， 在请求响应消 息中增加一个移动选项 OPTION_MOBILITY， OPTION_MOBILITY主要包括 三部分内容，即 option-code (选项代码）、 option-len (选项长度）和 option-data (选项数据） 字段。
请求消息和请求响应消息中的 OPTION一 MOBILITY的具体格式如表 1所 示： 表 1
0 1 2 3字节
0 1 2 34 5 6 7 8 9 0 1 2 345 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1比特位
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 OPT MOBILITY | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+·
I I
I Home - Agent- Address 1 (IPv6 address) or |
I I
I Home-Address |
I I
I Home-Agent- Address2 (IPv6 address) |
I I I I
当表 1中的 OPTION— MOBILITY应用于请求消息时， option-code用于标 识该请求消息的该移动选项中包含有 MN需要获取家乡代理信息， 即当请求 消息的移动选项中的选项标识为第一预定值如 200时， 说明该移动选项中包 含有 MN需要获取家乡代理信息， 第一预定值的选取需要向相关标准组织
(IETF— The Internet Engineering Task Force(Internet工程任务组)) 申请。 option-len用于标识移动选项中 option-data的长度，同时标识 MN是在家乡链 路上， 还是在外地链路中， 即当 option-len为第二预定值如 0时， 说明 MN 在家乡链路上，此时， 该移动选项中的 option-data应该为第三预定值如为空； 当 option-len为第四预定值如 16时， 说明 MN在外地链路上， 此时， 该移动 选项中的 option-data应该为 MN的家乡地址信息。
当表 1 中的 OPTION— MOBILITY应用于请求响应消息时， option- code 用于标识该请求响应消息的该移动选项中包含有 MN家乡代理信息， 即当请 求响应消息的移动选项中的选项标识为第一预定值如 200时， 说明该移动选 项中包含有 MN家乡代理地址信息， 第一预定值的选取需要向相关标准组织 申请。 option-len用于标识 option-data的长度，即 MN家乡代理信息的长度值， 该长度值应该为 16字节的整数倍； option-data用于承载 MN家乡代理地址信 息。
下面结合表 1对方法一的具体实现过程进行详细描述。
DHCPv6 服务器中预先设置网络中家乡代理地址信息， 家乡代理地址信 息可根据家乡链路的链路前缀来组织存储， 如果家乡链路上有多个家乡代理 地址信息， 则给每个家乡代理地址信息设定一个优先级， 将它们按优先级排 列成家乡代理地址列表。
MN在家乡链路通过 DHCPv6服务器申请家乡地址时， 将请求家乡地址 消息中的 option-code设置为 200， 将 option-len设置为 0， 将 option-data设置 为空， 然后， 发送该请求家乡地址消息。 option-len为 0说明 MN希望获取一 个租借期较长的 IP地址， 作为家乡地址使用。
DHCPv6服务器接收 MN的请求家乡地址消息， 应向 MN返回一个租借 期较长的 IP地址作为 MN的家乡地址。 同时， DHCPv6服务器在确定请求家 乡地址消息中 option-code为 200的 OPTION—MOBILITY中的 option-len为 0 时， 还需要确定该请求家乡地址消息的发送链路的前缀 （确定链路的前缀是 DHCPv6协议中定义的标准方法， 主要是根据链路前缀长度从 IPv6地址前面 截取相应位而形成，其中前缀长度信息通常在 DHCPv6请求消息里设定），根 据发送链路的前缀从其自身存储的家乡代理地址列表中确定匹配的表项， 并 将该表项中的家乡代理地址信息承载于请求家乡地址响应消息的 OPTION一 MOBILITY中的 option-code字段中， option-code字段中的家乡代理 地址信息可按照优先级排列。 然后， 设置请求家乡地址响应消息的 OPTION— MOBILITY中的 option-code为 200， option-len为 option-code字段 中家乡代理地址信息的长度， 该长度为 16字节的整数倍。 DHCPv6服务器将 该 MN的家乡地址与发送至 MN的家乡代理地址信息绑定起来。
MN接收请求家乡地址响应消息， 并从该响应消息的 option-code为 200 的 OPTION— MOBILITY中的 option-code承载的家乡代理地址信息中选择一 个作为 MN的家乡代理。
MN在外地链路通过 DHCPv6服务器申请转交地址时， 将请求转交地址 消息中的 option-code设置为 200, 将 option-len设置为 16， 将 option-data设 置为 MN 的家乡地址信息， 然后， 发送该请求转交地址消息。 option-len为 16说明] VIN在外地链路。
DHCPv6服务器接收 MN的请求转交地址消息， 应向 MN返回承载有转 交地址信息的请求转交地址响应消息。 DHCPv6服务器在确定请求转交地址 消息中 option-code为 200的 OPTION一 MOBILITY中的 option-len为 16时， 从请求转交地址消息的 option-code 为 200 的 OPTION— MOBILITY 中的 option-data获取其家乡地址信息， 根据获取的家乡地址信息从 MN家乡地址 与 MN家乡代理地址信息绑定的信息中确定 MN的家乡代理地址信息， 并将 MN家乡代理地址信息承载于请求家乡地址响应消息的 OPTION— MOBILITY 中的 option-code字段， option-code字段中的家乡代理地址信息可按照优先级 排列。 然后， 设置请求转交地址响应消息的 OPTION— MOBILITY 中的 option-code为 200， option-len为 option-code字段中家乡代理地址信息的长度， 该长度为 16字节的整数倍。
MN接收请求转交地址响应消息， 并从该响应消息的 option-code为 200 的 OPTION_MOBILITY中的 option-code承载的家乡代理地址信息中选择一 个作为 MN的家乡代理。
方法二、 在移动 IPv6 网络、 EMO中， 基于无状态方式实现获取 MN 家乡代理信息的方法。
方法二与方法一中的实现方式基本相同， 只是在方法二中， MN 向 DHCPv6服务器发送的请求消息不是请求家乡地址消息、 也不是请求转交地 址消息，而是请求与状态无关信息的消息， 即 Information-request message (信 息请求消息）， 相应的， DHCPv6 服务器向 MN 发送的响应消息为 Reply message (应答消息)。 Information-request message禾口 Reply message中均包含 有移动选项 OPTION— MOBILITY,且 DHCPv6服务器中存储的根据链路前缀 建立的家乡链路与家乡代理地址信息的对应关系即家乡代理地址信息列表、 家乡地址信息与家乡代理地址信息绑定的信息、 请求消息中移动选项的设置 情况、 请求响应消息中移动选项的设置情况与方法一中的描述基本相同。
下面通过附图 1对方法二的具体实现过程进行说明。
图 1中，在步骤 1-1、 MN通过家乡链路向 DHCPv6服务器申请与状态无 关的信息时， 将 Information-request message 中 OPTION— MOBILITY 的 option-code设置为 200， 将 option-len设置为 0, 将 option-data设置为空， 然 后， 发送该信息请求消息。
在步骤 1-1中， 如果 MN通过外地链路向 DHCPv6服务器申请与状态无 关的信息时， 将 Information-request message 中 OPTION— MOBILITY 的 option-code设置为 200， 将 option-len设置为 16， 将 option-data设置为 MN 的家乡地址， 然后， 发送该信息请求消息。
到步骤 1-2、 DHCPv6服务器接收到 MN的信息请求消息， 应向 MN返 回 MN请求的信息。同时， DHCPv6服务器在确定信息请求消息中 option-code 为 200的 OPTION_MOBILITY中的 option-len为 0时， 还需要确定该信息请 求消息的发送链路， 根据发送链路的前缀从其自身存储的家乡代理地址列表 中确定匹配的表项。 当信息请求消息中 option-code 为 200 的 OPTION_MOBILITY 中的 option-len 为 16 时， DHCPv6 服务器还需要从 OPTION— MOBILITY的 option-data中获取 MN的家乡地址信息，并从其自身 存储的家乡地址信息与家乡代理地址绑定的信息中确定 MN家乡地址信息对 应的家乡代理地址信息。
到步骤 l-3、DHCPv6服务器将 MN家乡代理地址信息承载于信息请求响 应消息的 OPTION_MOBILITY中的 option-code字段中， option-code字段中 的家乡代理地址信息可按照优先级排列。 然后， DHCPv6服务器设置信息请 求响应消息的 OPTION_MOBILITY中的 option-code为 200， option-len为 option-code字段中家乡代理地址信息的长度， 该长度为 16字节的整数倍。
到步骤 1-4、 MN接收信息请求响应消息， 并从该响应消息的 option-code 为 200的 OPTION— MOBILITY中的 option-code承载的家乡代理地址信息中 选择一个作为其家乡代理。
本发明提供的获取移动节点家乡代理信息的系统如图 2所示主要包括- 移动节点和 DHCPv6服务器。
其中，移动节点向 DHCPv6服务器发送请求信息以请求其家乡代理信息， 之后 DHCPv6服务器根据移动节点传输来的请求消息， 获取该移动节点的家 乡代理信息，并将所述家乡代理信息承载于请求响应消息中传输至移动节点。 其中， 本发明提供的获取移动节点家乡代理信息的系统可进一步包括一 存储模块（图未示)， 该存储模块中设置有网络中家乡代理地址信息， 家乡代 理地址信息可根据家乡链路的链路前缀来组织存储， 家乡代理地址信息可以 以家乡代理地址信息列表的形式存储， 家乡代理地址信息可以在 MN通过请 求家乡地址消息获得家乡代理地址信息时，与 MN的家乡地址信息绑定存储， 具体如上述方法中的描述。 该存储模块即如上所述的网管系统或其他配置了 家乡代理地址信息相关信息的系统。
本发明中的存储模块也可直接设置于 DHCPv6服务器中。
DHCPv6服务器在接收到 MN传输来的请求消息如请求家乡地址消息、 请求转交地址消息、 请求信息消息时， 可根据传输请求消息的链路确定 MN 家乡链路的前缀， 然后， 根据该前缀及其自身存储的家乡代理地址信息列表 确定 MN 的家乡代理地址信息； DHCPv6 服务器也可以根据请求消息中的 option-code为 200、 option-len为 16的 OPTION— MOBILITY中的 option-code 字段中承载的信息确定 MN的家乡地址信息， 然后， 根据存储模块中存储的 家乡地址信息与家乡代理地址信息的绑定信息确定 MN 的家乡代理地址信 息， 并将 MN家乡代理地址信息承载于请求响应消息中传输至 MN。 具体如 上述方法中的描述。
虽然通过实施例描绘了本发明， 本领域普通技术人员知道， 本发明有许 多变形和变化而不脱离本发明的精神， 本发明的申请文件的权利要求包括这 些变形和变化。

Claims

权利 要 求 书
1、 一种获取移动节点家乡代理信息的方法， 其特征在于， 包括- a、 DHCPv6服务器接收到移动节点的请求消息时， 获取该移动节点的家 乡代理信息；
b、 DHCPv6服务器将所述家乡代理信息承载于请求响应消息中传输至所 述移动节点。
2、 如权利要求 1所述的一种获取移动节点家乡代理信息的方法， 其特征 在于， 所述步骤 a具体包括-
DHCPv6服务器接收到移动节点的请求消息、并在确定请求消息中承载有 移动节点需要获取家乡代理信息时， 根据所述请求消息获取该移动节点的家 乡代理信息。
3、 如权利要求 2所述的一种获取移动节点家乡代理信息的方法， 其特征 在于， 所述移动节点需要获取家乡代理信息承载于请求消息扩展的移动选项 中。
4、 如权利要求 3所述的一种获取移动节点家乡代理信息的方法， 其特征 在于， 所述移动选项包括： 标识请求消息的该移动选项中包含有移动节点需 要获取家乡代理信息的选项标识、 标识移动节点在家乡 /外地链路的选项长度 和选项数据；
所述请求消息中包含有移动节点需要获取家乡代理信息、 且移动节点在 家乡链路时， 所述选项标识为第一预定值、 选项长度为第二预定值、 所述选 项数据为第三预定值；
所述请求消息中包含有移动节点需要获取家乡代理信息、 且移动节点在 外地链路时， 所述选项标识为第一预定值、 选项长度为第四预定值、 所述选 项数据为移动节点的家乡地址信息。
5、如权利要求 1、 2、 3或 4所述的一种获取移动节点家乡代理信息的方法， 其特征在于， 所述方法在步骤 a之前还包括：
a，、 在 DHCPv6服务器中设置移动节点的家乡代理信息， 或者 DHCPv6服 务器从存储有家乡代理信息相关信息的网络实体中获取移动节点的家乡代理 信息， 并进行存储；
且所述步骤 a中获取该移动节点的家乡代理信息的步骤具体包括： al、 DHCP服务器根据其自身存储的家乡代理信息、其接收的请求消息确 定发送请求消息的移动节点的家乡代理信息。
6、 如权利要求 5所述的一种获取移动节点家乡代理信息的方法， 其特征 在于， 所述步骤 a'具体包括：
al '、 在 DHCPv6服务器中根据各家乡链路前缀信息设置各家乡链路与家 乡代理信息的对应关系、 且家乡链路对应的家乡代理信息根据优先级排序； 和 /或
a2\ 在 DHCPv6服务器中设置移动节点的家乡地址与家乡代理信息的绑 定对应关系、 且与家乡地址绑定的家乡代理信息根据优先级排序。
7、 如权利要求 6所述的一种获取移动节点家乡代理信息的方法， 其特征 在于， 所述步骤 al具体包括-
DHCPv6服务器确定其接收请求消息的链路前缀，并根据其自身存储的家 乡代理信息确定与该链路前缀匹配的家乡代理信息； 或
DHCPv6服务器确定其接收的请求消息中承载的家乡地址信息，并根据其 自身存储的绑定对应关系确定与所述家乡地址信息匹配的家乡代理信息。
8、如权利要求 1、 2、 3或 4所述的一种获取移动节点家乡代理信息的方法, 其特征在于，所述步骤 b中的家乡代理信息承载于请求响应消息扩展的移动选 项中。
9、 如权利要求 8所述的一种获取移动节点家乡代理信息的方法， 其特征 在于， 所述移动选项包括： 标识请求响应消息的该移动选项中包含有家乡代 理信息的选项标识、 标识家乡代理信息长度的选项长度和承载家乡代理信息 的选项数据。
10、如权利要求 8所述的一种获取移动节点家乡代理信息的方法， 其特征 在于， 所述步骤 b还包括：
DHCPv6服务器中在向移动节点发送家乡地址信息时，确定移动节点的家 乡代理信息， 并将移动节点的家乡地址信息与家乡代理信息绑定存储。
11、 如权利要求 1、 2、 3或 4所述的一种获取移动节点家乡代理信息的方 法， 其特征在于， 所述家乡代理信息包括： 家乡代理地址信息。
12、 如权利要求 1、 2、 3或 4所述的一种获取移动节点家乡代理信息的方 法， 其特征在于， 所述请求消息为： 基于 DHCPV6有状态方式的请求家乡地址 消息、 或基于 DHCPv6有状态方式的请求转交地址消息、 或基于 DHCPv6无状 态方式的请求与状态无关信息消息。
13、 一种获取移动节点家乡代理信息的系统， 其特征在于， 所述系统包 括：
移动节点， 其发送请求信息以请求其家乡代理信息； 以及
DHCPv6服务器，其根据移动节点传输来的请求消息，获取该移动节点的 家乡代理信息， 并将所述家乡代理信息承载于请求响应消息中传输至移动节 点。
14、 如权利要求 13所述的一种获取家乡代理信息的系统， 其特征在于， 该系统进一步包括一存储模块， 该存储模块存储有移动节点家乡代理信息的 相关信息， 其中，
DHCPv6服务器在接收到移动节点传输来的请求消息时，从该存储模块中 获取该移动节点的家乡代理信息。
15、 如权利要求 13所述的一种获取家乡代理信息的系统， 其特征在于， 该 DHCPv6服务器进一步包括一存储模块，该存储模块存储有移动节点的家乡 代理信息。
PCT/CN2006/001296 2005-09-07 2006-06-13 A method for obtaining the home agent information of the mobile node and a system thereof WO2007028300A1 (en)

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