Recently, mobile data communication based on Mobile IP protocols is one of the hottest topics in communication fields. Since it is expected that the number of mobile terminals is large, it is required to introduce the hierarchical location management for mobile terminals. IETF is actively standardizing the hierarchical location management for both Mobile IPv4 and Mobile IPv6. This paper describes the overviews of IETF activities on hierarchical location management. In the method standardized by IETF, mobile terminals need to support protocols for hierarchical location management. This paper proposes a method to support hierarchical location management without any additional functions to mobile terminals.
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