Importance

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Abstract

In a communication network in which terminals (11) are mobile in the network, the mobility must be managed, and in particular the location of the mobile terminal needs to be determined. Networks each have an associated name server (13) and the name server (13) stores a care-of-address for the terminal (11), as well as a permanent address. As the terminal moves from one subnet of the network to another the care-of-address is changed to reflect the current subnet. Therefore, the input of the name of the mobile terminal (11) identifies via the care-of-address the subnet in which the terminal is currently located. The network is divided with domains each with its own name server (13, 14) as the terminal (11) moves from its home domain to a foreign domain, the name server (14) of that foreign domain may be updated with details of the mobile terminal (11) so that any query to the terminal (11) originating in the foreign domain may be resolved within that foreign domain. A care-of-address may be stored in the name server (14) of that foreign domain. Then, the address of the name server (14) of that foreign domain may be used as the care-of-address in the name server of the home domain (13).

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