| 摘要 |
A technique that employs, for the purpose, the allocation of the optimal home agent (HA) for a mobile terminal (MN) that has moved between domain networks is disclosed. According to this technique, when a MN 10 has performed a handover between domain networks (e.g., a handover from an external domain network 23 to an external domain network 33 ), an authentication server (AAAh server 400 ) present in a home domain network 43 of the MN transmits a request to a plurality of authentication servers that have a roaming relationship for measuring a HA selection condition transmitted by a MN 10 , and selects the optimal HA based on the obtained HA selection condition information (the measurement results for the HA selection condition). Further, a HA that is most suitable for a condition can also be selected by referring to a roaming condition relative to each authentication server.
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