Patent ID: 6122268
Filing Date: 2000-09-19
Classification: H04L,H04W

Abstract:
A method for allocating a geographical identifier, implemented in a network, the method comprising the steps of:providing a plurality of sub networks with one another;maintaining a plurality of movable hosts each having a geographical identifier depending on the currently connected sub network and a logical identifier independent of the currently connected sub network and allowing said movable hosts to be moved among said sub networks while keeping communication therebetween, each of said movable hosts serving to conduct communications of packets, each having a header based on said geographical identifier and another header based on said logical identifier;providing a node for supporting communication with said movable host in each of said sub networks, such that said node of each of said sub networks executes the steps of:allocating a same geographical identifier to the plurality of movable hosts connected in one of said sub networks and storing the logical identifiers and data link layer addresses of said plurality of movable hosts in a registration table;detecting a destination logical identifier of a packet if any packet is received and if said received packet is destined for the movable host to which said same geographical identifier is allocated by using said detected destination logical identifier and said registration table;generating a data link layer header by using a data link layer address of the movable host identified by said destination logical identifier in said registration table; andadding said generated data link layer header to said received packet before transferring said packet;wherein the packets transmitted to a movable host are controlled to be transmitted through a node of a sub network having said movable host connected therewith based on a Proxy Address Resolution Protocol.