CN108809934B - Mobility management protocol negotiation method in IPv6 network - Google Patents
Mobility management protocol negotiation method in IPv6 network Download PDFInfo
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- CN108809934B CN108809934B CN201810353147.7A CN201810353147A CN108809934B CN 108809934 B CN108809934 B CN 108809934B CN 201810353147 A CN201810353147 A CN 201810353147A CN 108809934 B CN108809934 B CN 108809934B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/24—Negotiation of communication capabilities
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- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a method for negotiating a mobility management protocol in an IPv6 network, which comprises the following steps: in the framework of an MIPv6 protocol cluster, a mobile capability selection message function and a mobile capability decision machine module are added; when a terminal accesses a new wireless network, if a router notification message which contains an MC option and is not empty in an appointed mobility management protocol field and is broadcasted by the wireless network is received, the terminal analyzes the corresponding MC option to obtain the type of the mobility management protocol which has been selected by the wireless network; otherwise, the terminal sends request message to the access router in the wireless network; the request message comprises an MC option, and the MC option carries mobility management protocol type information supported or specified by the terminal; then the access router selects a mobility management protocol to inform the terminal based on the network mobility management protocol and the MC option information in the request message. The invention can better support the application of the terminal.
Description
Technical Field
The invention relates to a mobility management protocol negotiation method in an IPv6 network, belonging to the technical field of networks.
Background
With the advancement of IPv6 full deployment and the deep convergence of the internet and telecommunication networks, the mobile internet based on the all-IP architecture becomes one of the most basic features of the next generation internet, and the implementation of the all-IP mobile internet must have efficient IP layer mobility management protocol support.
The IETF published the first draft of the working group of Mobile IPv6(Mobile IPv6, MIPv6) in 1996, and published RFC3775 in 6 months in 2004, becoming the first framework MIPv6 standard. The MIPv6 makes full use of the characteristics of the IPv6 protocol, and ensures the transparency of the movement of the nodes at an IP layer to the application of an upper layer through a tunnel in a route redirection mode. Meanwhile, aiming at the development trend of internet Mobility research, the IETF sets three working groups in turn to be responsible for related theoretical research and protocol standardization work, namely, an MIPv6 working group, a mobile IPv6Signaling and Handoff Optimization (MIPv6Signaling and Handoff Optimization, MIPSHOP) working group and a subnet Mobility (NEMO) working group. The main purpose of the working group of MIPv6 will be to continue to enhance the functionality of basic MIPv6 for a wide range of application requirements. In addition, the workgroup is also responsible for handling any issues that arise during deployment and implementation of this basic protocol. The MIPSHOP working group uses two important extension protocols of MIPv6, namely Hierarchical Mobile IPv6(Hierarchical Mobile IPv6, HMIPv6) and Fast Mobile IPv6(Fast Mobile IPv6, FMIPv6), as important performance enhancement protocols of MIPv 6. The NEMO working group aims at studying mobility management when the subnet as a whole changes the Internet access point. In addition, this working group works in conjunction with the MIPv6 working group, designing a mechanism to allow IPv4/IPv6 network hybrid applications. In this direction of research, working groups have been working on solving NEMO deployment problems, particularly some significant problems in the deployment of global networks such as automotive and aerospace.
On the other hand, in order to support efficient Localized Mobility Management, the IETF established a Network-based Localized Mobility Management (NETLMM) working group in 2006, which was tasked with designing a Network-based local Mobility Management protocol. The local mobility management protocol is independent of any global mobility management protocol, it runs on top of IP and is transparent to the link layer. The protocol is applicable to a variety of last hop links by the access router's generic interface to the various links that provides a reliable indication and unique identification of the handover for the mobile node. The access router is enabled to perform route updates on behalf of the mobile node using NETLMM protocol. The working group introduced Proxy Mobile IPv6(Proxy Mobile IPv6, PMIPv6) specification in 2008 as a network-based mobility management protocol standard in IPv6 environment. Under this branch, various extended mobility management protocols are also applied.
Therefore, in the IPv6 ubiquitous mobile environment, multiple mobility management protocols must coexist, and the network side and the terminal side may run multiple mobility management protocol processes simultaneously to support and adapt to different mobile scenarios and service modes, so that when the terminal accesses the network or performs handover, the network and the terminal can only perform mobility management according to a default selected mechanism: if the network and terminal default protocols are consistent, then the mechanism may not be optimal, i.e., not better supporting the application of the terminal; mobility management will fail if the network and terminal default protocols are not consistent. Therefore, how to select the mobility management protocol becomes an urgent problem to be solved.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide a mobility management protocol negotiation method in an IPv6 network.
A method for negotiating mobility management protocol in IPv6 network, comprising the steps of:
in the framework of an MIPv6 protocol cluster, a mobile capability selection message function and a mobile capability decision machine module are added;
when a terminal accesses a new wireless network, if a router notification message which contains an MC option and is not empty in an appointed mobility management protocol field and is broadcasted by the wireless network is received, the terminal analyzes the corresponding MC option to obtain the type of the mobility management protocol which has been selected by the wireless network;
when a terminal accesses a new wireless network, if a router notification message which contains an MC option and is empty in a specified mobility management protocol field and is broadcasted by the wireless network is received, the terminal sends a request message to an access router in the wireless network; wherein, the request message includes an MC option; then the access router selects a mobility management protocol based on the network mobility management protocol and the MC option information in the request message, and informs the terminal of the network mobility management protocol of the wireless network and the finally selected mobility management protocol; the MC option carries supported or designated mobility management protocol type information.
Further, if the mobility management protocol selected by the access router is different from the mobility management protocol in the request message of the terminal, the access router updates the mobility management protocol of the terminal stored in the wireless network to the selected mobility management protocol.
Further, if the terminal is not accessed to the new wireless network for protocol selection, the access router of the wireless network selects a mobility management protocol based on the mobility management protocol information of the terminal stored in the wireless network, and informs the terminal of the network mobility management protocol of the wireless network and the finally selected mobility management protocol.
Further, the mobility management protocol of the terminal is stored in a policy center or an authentication server of the wireless network.
Further, the format of the MC option includes a type field, a length field, a number of supported mobility management protocols field, a reserved field, a designated mobility management protocol field, and a supported mobility management protocol field.
Further, when the terminal accesses a new wireless network and receives a router advertisement message which is broadcasted by the wireless network and contains the MC option and the designated mobility management protocol field is empty, the terminal analyzes the corresponding MC option to obtain the mobility management protocol type supported by the wireless network; then the terminal combines the mobile management protocol type supported by the wireless network and the mobile management protocol supported by the terminal to select a mobile management protocol, generates a request message containing the MC option and sends the request message to the access router.
Further, the request message is an extended router request message.
Further, the network mobility management protocol of the wireless network and the finally selected mobility management protocol are informed to the terminal through a router advertisement message; the router advertisement message includes an MC option.
Furthermore, a mobile capability selection message function and a mobile capability decision machine module are added on the access router, and a mobile capability selection message function and a mobile capability decision machine module are added on the terminal.
Compared with the prior art, the invention has the following positive effects:
the invention provides an IPv6 mobility management protocol negotiation principle and a flow, thereby enabling the negotiation of the mobility management protocol between a network and a terminal to be carried out and better supporting the application of the terminal; the invention expands Router Advertisement (RA) information, and supports the network to initiatively announce the mobility support capability at the network side; the invention expands the Router Solicitation (RS) information, supports the terminal to request the network layer mobility support ability; mobility Capability options (MC) are proposed, supporting the above functions.
Drawings
FIG. 1 is a diagram of a mobility capability negotiation protocol framework in accordance with the present invention;
FIG. 2 is a diagram of a mobility capability negotiation process;
fig. 3 is a diagram of the MC option structure.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
1. IPv6 mobility capability negotiation principle and flow
When a terminal initially accesses a wireless network or is switched to a new wireless network, the terminal will actively request the mobility support capability of the wireless network or obtain the mobility support capability information of the wireless network through an RA message, and the terminal will select a mobility support protocol according to a priority order based on the following principle:
1) if the network side supports the network-based mobility management protocol, selecting the network-based mobility management protocol by default (such as PMIPv 6);
2) selecting a protocol according to the network side capability;
3) selecting a protocol based on the terminal preferences;
4) support for function extension protocols (e.g., NEMO);
5) support for performance optimization protocols (e.g., HMIPv 6).
The selection process firstly considers the capability of the network side and then considers the preference of the terminal, and for a specific protocol, the priority of the function expansion protocol is higher, and the performance optimization protocol is the second time. For this purpose, the protocol framework shown in fig. 1 will be supported in the mobility management protocol stack of the network side and the terminal.
The invention provides a mobile capability selection message function and a mobile capability decision machine module which are added in the framework of the traditional MIPv6 protocol cluster; such as an Access Router (AR) on the network side, and a mobility selection message function and a mobility decision machine module are added on the terminal MN. The mobility notification message function of the kernel space is the mobility information of the interactive network side and the client, and the mobility decision machine module of the user space selects a consistent mobility management protocol based on the principle and schedules a corresponding mobility management protocol process. And the routing management and the data packet forwarding are uniformly executed in a kernel space.
The invention provides a mechanism for negotiating mobility based on neighbor discovery messages, and the main flow is shown in figure 2:
1) when a terminal accesses a new wireless network, a router request message is sent to an access router in the network, wherein the MC option carries self-supported or preferred mobility management protocol type information;
2) the access Router selects a mobility management protocol based on the network mobility management protocol and the information of the terminal, and informs the terminal of the network capability and the finally selected protocol type through a Router Advertisement message (Router Advertisement); taking a mobility management protocol in the MC option of the terminal as basic information of the terminal and storing the basic information in a policy center/authentication server of the wireless network;
3) if the selected protocol is different from the mobility management protocol used by the terminal before, the access router updates the corresponding information of the terminal in the policy center or the authentication server through the authentication protocol or other management messages;
4) when the terminal is not in protocol selection in the access network, the access router will select based on the information stored by the policy center or the authentication server. The invention stores the mobility management protocol selection information of the terminal in a policy center or an authentication server based on MIPv6 and PMIPv6 protocol scenes, and if other entities manage the terminal mobile service information in an actual network, the function can be supported.
2. IPv6 mobility capability negotiation signaling
The invention supports the mobile capability information announcement of the terminal and the network by expanding the neighbor discovery message.
1) RA message extensions
The invention adds a 1bit flag bit C in the Reserved field of the RA message, which is used for indicating that the RA message sent by the access router contains MC Option, and the MC Option is in the Option field of the RA message.
2) RS message extension
In the Reserved field of the RS, the MC Option is contained in the request message by using a 1-bit C flag bit indication, and the MC Option is in the Option field of the RS message.
3) MC option
The MC option format is shown in fig. 3, with each field being 8 bits in length.
Type (2): MC option type value, not specified by the present invention;
length: the length of the MC option;
number of mobility management protocols supported: the number of mobility management protocols supported (e.g., n);
and (3) reserving: the reserved field of the option is used for subsequent function expansion;
specified mobility management protocol: if the mobile management protocol type specified by the network or the mobile management protocol preferred by the terminal is not specified, the mobile management protocol type is null;
supported mobility management protocols: the invention is not limited to the representation rule in specific implementation, and each protocol is represented by a 16bits field.
4) Processing logic
Based on the C flag bit and MC option of the RA/RS message, the specific protocol selection logic is as follows:
when the terminal receives a router advertisement message which contains a C flag bit set to 1 and a field of an 'appointed mobility management protocol' of an MC option is not empty (the setting to 1 represents that the received message contains the MC option), the fact that the access network selects the mobility management protocol for the terminal is indicated, so that the terminal analyzes the corresponding MC option which contains the type of the mobility management protocol already selected by the network;
when the terminal receives a router notification message which contains a C flag bit set to 1 and an 'appointed mobility management protocol' field of an MC option is empty, the terminal indicates that a network does not select a mobility management protocol for the terminal, but contains a mobility management protocol type supported by the network, the terminal selects a certain mobility management protocol by analyzing the corresponding MC option and combining with the self-supported mobility management protocol, the terminal sends the selected mobility management protocol to an access router through an RS message containing the MC option, and if the access router agrees, the terminal returns a router notification message which contains the C flag bit set to 1 and does not have the 'appointed mobility management protocol' field of the MC option to be empty to confirm the terminal;
when the access router receives that the C zone bit of the RS is 1 and the 'designated mobility management protocol' field of the MC option is not empty, the access router indicates that the terminal wants to carry out mobility capability negotiation, and the preferred mobility management protocol is carried in the MC option of the RS message;
when the access router receives that the C flag bit of the RS is 1 and the "designated mobility management protocol" field of the MC option is null, it indicates that the terminal has no preference for the mobility management protocol, and only includes the mobility management protocol supported by the terminal in the MC option, and the terminal will be selected by the network.
The mobility management protocol selection is dominated by the network, if the access network supports a point-to-point link, mobility negotiation can be performed with each terminal, otherwise, the network selects the same protocol for all access devices or realizes protocol selection for the terminal based on the logic of the invention through other point-to-point communication protocols (such as DHCP, Diameter and the like).
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and a person skilled in the art can make modifications or equivalent substitutions to the technical solution of the present invention without departing from the spirit and scope of the present invention, and the scope of the present invention should be determined by the claims.
Claims (5)
1. A method for negotiating mobility management protocol in IPv6 network, comprising the steps of:
in the framework of an MIPv6 protocol cluster, a mobile capability selection message function and a mobile capability decision machine module are respectively added on an access router and a terminal; the mobile capability decision machine module is used for selecting a consistent mobile management protocol based on an IPv6 mobile capability negotiation principle and scheduling a corresponding mobile management protocol process; the IPv6 mobility capability negotiation principle comprises the following steps: 1) selecting a network-based mobility management protocol by default if the network side supports the network-based mobility management protocol; 2) selecting a protocol according to the network side capability; 3) selecting a protocol based on the terminal preferences; 4) support for a function extension protocol; 5) support for performance optimization protocols;
when a terminal accesses a new wireless network, if a router advertisement message RA which contains mobile capability options and is not empty in a specified mobile management protocol field and is broadcasted by the wireless network is received, the terminal analyzes the corresponding mobile capability options to obtain the mobile management protocol type selected by the wireless network; adding a 1-bit zone bit C in a Reserved field of a router advertisement message RA, wherein the zone bit C is used for indicating that the router advertisement message RA sent by an access router contains a mobile capability Option, and the mobile capability Option is in an Option field of the router advertisement message RA; in a Reserved field of a router request message RS, using a 1-bit C zone bit to indicate that the router request message contains a mobile capability Option, wherein the mobile capability Option is in an Option field of the router request message RS; the format of the mobile capability option comprises a type field, a length field, a number of supported mobility management protocols field, a reserved field, a designated mobility management protocol field and a supported mobility management protocol field;
when a terminal accesses a new wireless network, if a router advertisement message RA which contains a mobility capability option and is empty in a specified mobility management protocol field and is broadcasted by the wireless network is received, the terminal sends a router request message RS to an access router in the wireless network; wherein, the router request message RS comprises a mobile capability option; then the access router selects a mobility management protocol based on the network mobility management protocol and the mobility capability option information in the router request message RS, and informs the terminal of the network mobility management protocol of the wireless network and the finally selected mobility management protocol; the mobility capability option carries supported or appointed mobility management protocol type information.
2. The method of claim 1, wherein the access router updates the mobility management protocol of the terminal saved in the wireless network to the selected mobility management protocol if the mobility management protocol selected by the access router is different from the mobility management protocol in the router solicitation message RS of the terminal.
3. The method according to claim 1 or 2, wherein if no protocol selection is made for the terminal to access a new wireless network, the access router of the wireless network selects a mobility management protocol based on the mobility management protocol information of the terminal stored in the wireless network and informs the terminal of the network mobility management protocol of the wireless network and the finally selected mobility management protocol.
4. A method according to claim 3, characterized in that the mobility management protocol of the terminal is stored in a policy centre or an authentication server of said wireless network.
5. The method of claim 1, wherein when a terminal accesses a new wireless network and receives a router advertisement message RA broadcasted by the wireless network and containing mobility options and a specified mobility management protocol field is empty, the terminal will parse the corresponding mobility options to obtain a mobility management protocol type supported by the wireless network; then the terminal combines the mobility management protocol type supported by the wireless network and the mobility management protocol supported by the terminal to select a mobility management protocol, generates a router request message RS containing mobility capability options and sends the router request message RS to the access router.
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