Patent ID: 7911973
Filing Date: 2011-03-22
Classification: H04L,H04W

Abstract:
1. A router location registration method comprising: a step in which when a first mobile router has a network identifier specifying a moving network to which the first mobile router is connected, the first mobile router generates a key that corresponds to the network identifier and transmits a registration request packet including the network identifier and the key to a home agent which manages a location of the first mobile router; a step in which in the case where any network identifier which is identical to the network identifier of the first mobile router described in the received registration request packet has not yet been registered, the home agent binds and holds the network identifier and the key of the first mobile router with location information of the first mobile router and registers the first mobile router as a main mobile router of the moving network, and sends a response of registration permission to the first mobile router; a step in which when the first mobile router receives the response of registration permission from the home agent, the first mobile router distributes the network identifier and the key to a second mobile router in the moving network; a step in which the second mobile router transmits a registration request packet including the network identifier and the key distributed from the first mobile router, to the home agent which manages the location of the second mobile router; and a step in which when the home agent receives the registration request packet including a network identifier and a key which are identical to an already registered network identifier and key from the second mobile router, the home agent carries out registration or updates the registered information as a subsidiary mobile router which shares the network identifier, wherein the registration request packet further includes lifetime information for information to be registered, and the method further comprises: a step in which the home agent deletes registration of the registered first mobile router or second mobile router at the time that lifetime has expired; a step in which the first mobile router periodically updates the key which corresponds to the network identifier and the lifetime information within the lifetime and transmits an update request packet to the home agent; a step in which when the home agent receives the key update request from the first mobile router registered as the main mobile router, the home agent updates the held key and the remaining lifetime to the received key and lifetime and sends a response giving update permission to the first mobile router; a step in which, when the first mobile router receives the response of update permission from the home agent, the updated key is distributed to the second mobile router in the moving network; and a step in which the second mobile router transmits an update request packet including the updated key and lifetime information distributed from the first mobile router, to the home agent.