Patent ID: 8145771
Filing Date: 2012-03-27
Classification: H04L

Abstract:
1. A name system for correlating a device and a network address on a communication network, the name system configured so as to form a first name system layer for registering only a device for which access from another party is permitted, and form a second name system layer for registering a device that can be accessed only by a user having specified access authority, wherein: a name server device for functioning in both of the name system layers is provided for each cluster defined as a collection of devices for each location in the second name system layer, acquires device registration information that includes at least a network address and type of a device from one or more devices in the cluster, and stores a correspondence list of the devices and addresses in the cluster; the name server device has a link for exchanging the correspondence list with a name server device of another cluster within the second name system layer, and enables the user having specified access authority to access a device of any cluster; in the first name system layer, the name server device connects to a function addition name server device constituting a hierarchical domain, and provides the correspondence list for a device for which access from another party is permitted in the second name system layer; access to a device belonging to the domain, is attained by the other party through device/network address conversion of the function addition name server device; the name server device provides a correspondence list for a device for which access from another party is permitted, to a home access-point name server device in the form of a home name server device, which is the function addition name server device for managing a domain of a home network to which a user belongs, and a foreign access-point name server device, which is the function addition name server device to which said name server device of the cluster in which the user is currently positioned is connected, wherein said home and foreign access-point name servers are different from each other in said first name system layer, wherein said name server device of the cluster in which the user is currently positioned is configured to move between the home and foreign access-point name server; the foreign access-point name server device transmits its network address and information of a device that received the correspondence list, to the home name server device; and the home name server device notifies the other party of the network address of the foreign access-point name server device when access to a device addressed to the home name server device has occurred.