Home agent discovery upon changing the mobility management scheme
a technology of mobility management scheme and discovery method, applied in the field of mobile nodes and home agent discovery, can solve the problems of not being able to identify the home node, requiring support from the visited access network, and disconnecting from the connection
Inactive Publication Date: 2011-02-03
PANASONIC CORP
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Benefits of technology
[0056]Another embodiment of the invention relates to a computer-readable medium storing instructions that, when executed by a home agent, cause the home agent to provide a mobile node with information helping the mobile node to discover the home agent serving the mobile node, by receiving a home agent discovery message from the mobile node, wherein the home agent discovery message comprises information on the mobile node's location prior to changing the mobility management scheme; maintaining bindings of plural mobile nodes served by the home agent in a binding cache; determ
Problems solved by technology
However, since connections on higher-layers such as TCP connections on the transport layer of the OSI model are defined with the IP addresses (and ports) of the communicating nodes, the connection breaks, if one of the nodes changes its IP address, e.g. due to movement.
A commonly identified drawback is that it requires support from the visited access network.
Furthermore, it should not be possible for a node to identify the home agent that serves another mobile node.
Method used
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Examples
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Embodiment Construction
[0067]In the following the principles of the invention will be explained with respect to different embodiments. For exemplary purposes most of the following examples relate to a change from a network-based mobility scheme to a client-based mobility scheme, or to a mobile node moving out of coverage of a Proxy Mobile IP domain and entering a network region where (Client) Mobile IP is used.
[0068]When a mobile node is attaching to a network that uses network-based mobility management, the network selects an anchor (home agent / local mobility anchor) for the mobile node and registers the mobile node at this home agent / local mobility anchor using the standard signaling mechanisms. In case the mobile node moves from this network area using network-based mobility management to a network area, where host-based mobility management is used, the IP address prefix in this new network area is typically different to the one offered to the mobile node in the network area using network-based mobilit...
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The invention relates to a method for discovering a home agent serving a mobile node upon the mobile node changing its mobility management scheme in a packet-switched network and the implementation of such method in a mobile node or home agent. In order to propose a home agent discover scheme that maintains session continuity in a seamless manner upon a mobile node changing its mobility management scheme, a mobile node comprises information on its location prior to changing the mobility management scheme to one of the first signaling messages transmitted upon changing the mobility management scheme (home agent discovery message). The receiving node uses this information to identify the home agent serving the mobile node or to provide a hint to the home agent where the mobile node is registered in a response message to the mobile node. This approach may also be used for path optimization when a mobile node moves from a trusted to an un-trusted access network.
Description
FIELD OF THE INVENTION[0001]The invention relates to method and mobile node for discovering a home agent serving a mobile node upon the mobile node changing its mobility management scheme in a packet-switched network. Furthermore, the invention relates to a home agent supporting the mobile node in discovering its serving home agent upon changing the mobility management scheme.TECHNICAL BACKGROUND[0002]Communications systems evolve more and more towards an Internet Protocol (IP)-based network. They consist of many interconnected networks, in which speech and data is transmitted from one terminal to another terminal in pieces, so-called packets. Packets are routed to the destination by routers in a connection-less manner. Therefore, IP packets consist of IP header and payload information and the header comprises among other things source and destination IP address. For scalability reasons a large IP network is usually divided in subnets and uses a hierarchical addressing scheme. Hence...
Claims
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Login to View More IPC IPC(8): H04L12/28
CPCH04W8/065H04W8/26H04W8/08H04W80/045H04W88/182H04W80/04H04L61/5007H04L2101/659H04L63/0281H04L63/029H04L63/06H04L63/08H04L63/10H04L63/061
Inventor WENIGER, KILIANARAMAKI, TAKASHIHIRANO, JUNBACHMANN, JENSIKEDA, SHINKICHI
Owner PANASONIC CORP