System for location multicasting and database management for mobile sessions in any computer subnetworks without using a home router of a home subnetwork

摘要

In a computer network where each mobile host is assigned a subnetwork-independent logical identifier (L-ID), the mobile host acquires a subnetwork-dependent geographical identifier (G-ID) from an agent-existing subnetwork and sends the G-ID to the home subnetwork of the mobile host for location registration if a beacon received therefrom is a first one or different from a previous one or acquires a G-ID from an agentless subnetwork and sends the G-ID to the home subnetwork if no beacons are received. At intervals, a multicast packet is sent from the mobile host, containing the acquired G-ID to the agentless subnetwork. A similar multicast packet is received from a second mobile host and the G-ID contained therein is stored in a database corresponding to the L-ID of the second mobile host. When establishing a session, a data packet is sent from the mobile host to the network along with a G-ID corresponding to a L-ID of the data packet stored in the database. No G-ID is appended if the L-ID of the data packet has no corresponding identifier in the database. At the home subnetwork, a data packet destined to a mobile host of a subnetwork is encapsulated with the G-ID of the mobile host and routed to the subnetwork.