Patent ID: 6646999
Filing Date: 2003-11-11
Classification: H04W

Abstract:
A mobile packet communication system comprising mobile terminals connected via a mobile radio communication network, subscriber nodes accommodating said mobile terminals, gate nodes connected to fixed equipment including Internet service providers or local area networks, and a plurality of location registration servers, one for each group of destination packet addresses having the same high-order digits, wherein said subscriber nodes, said gate nodes, and said location registration servers are interconnected by a network, and wherein:said subscriber nodes, said gate nodes, and said location registration servers are each assigned a unique address for routing; said location registration servers each include a register which stores, for each mobile terminal assigned a packet address containing the high-order digit of packet destination address associated with said each location registration server, the address of the subscriber node currently serving said each mobile terminal, or stores, for each fixed equipment assigned a packet address containing said high-order digit, the address of the gate node to which said each fixed equipment is connected; said subscriber nodes and said gate nodes each include a table used to retrieve the address of the corresponding location registration server by reference to the high-order digit of the packet destination address; a transmitting node, which is a subscriber node that received a packet from a particular mobile terminal or a gate node that received a packet from particular fixed equipment, includes means for retrieving the address of the corresponding location registration server by reference to the high-order digit of the destination address contained in said packet, and for transferring said received packet to said location registration server; said location registration server includes means for retrieving, by reference to the destination address contained in said received packet, the address of the mobile terminal corresponding to said destination address or the address of a receiving gate node connected to the fixed equipment corresponding to said destination address, and for returning the retrieved receiving node address to said transmitting node; and said transmitting node includes means for temporarily storing said receiving node address returned from said location registration server, and for transferring any subsequent packet having the same destination address and received from said mobile terminal or said fixed equipment, directly to said receiving node by using said temporarily stored receiving node address.