Method for connecting IP-based USN with conventional IP network

1. An Internet protocol (IP) based multiple ubiquitous sensor network (USN) connection system comprising:

a first IP-based USN system having a first plurality of sensor nodes, which have unique first IP addresses, and a first IP-USN router having a first table that stores each location address of the first plurality of sensor nodes, and periodically broadcasting its own presence information for updating the location address stored in the first table;

a second IP-based USN system having a second plurality of sensor nodes, which have unique second IP addresses different from the first IP addresses, and a second IP-USN router having a second table that stores each location address of the second plurality of sensor nodes, and periodically broadcasting its own presence information for updating the location address stored in the second table; and

a USN directory system connected to the first IP-USN router and the second IP-USN router, the USN directory system including a directory server having protocol information and location information of the first IP-based USN system and the second IP-based USN system.

2. The IP-based multiple USN connection system of claim 1 , wherein the first IP-based USN system and the second IP-based USN system use different service protocols.

3. An Internet protocol (IP) based multiple ubiquitous sensor network (USN) connection system comprising:

a first IP-based USN system having a first plurality of sensor nodes, which have unique first IP addresses, and an IP-USN router having a first table that stores each location address of the first plurality of sensor nodes, and periodically broadcasting its own presence information for updating the location address stored in the first table;

an second IP-based USN system having a second plurality of sensor nodes, which have unique second IP addresses different from the first IP addresses, sharing the IP-USN router, and storing each location address of the second plurality of sensor nodes in a second table included in the IP-USN router; and

a USN directory system connected to the IP-USN router, the USN directory system including a directory server having protocol information and location information of the first IP-based USN system and the second IP-based USN system.

4. The IP-based multiple USN connection system of claim 3 , wherein the first IP-based USN system and the second IP-based USN system use different service protocols.

5. A method of providing an object information service of an ubiquitous sensor network (USN), the method comprising:

(a) querying a local server by transmitting a USN uniform resource locator (URL) for obtaining information of a desired sensor node;

(b) querying of a first local object directory server (ODS) by converting the transmitted USN URL to a domain name by the queried local server;

(c) querying of a national ODS by the first local ODS to find the location of a corresponding information server;

(d) transmitting the address of a second local ODS in the form of an address record by the national ODS, the second local ODS managing the corresponding information server;

(e) querying of the second local ODS again for the location of the information server related to a corresponding code, in the form of a Domain Name System query by the first local ODS;

(f) transmitting of a Naming Authority Pointer (NAPTR) record to the information server to the first local ODS by the second local ODS;

(g) transmitting the received NAPTR record to the local server;

(h) receiving of the information of the desired sensor node by discovering the location of the information server in the NAPTR record and connecting to the information server by the local server;

(i) transmitting the information of the desired sensor node to the local server; and

(j) transmitting of the information of the desired sensor node externally by the local server.

6. The method of claim 5 , wherein the query in step (c) may be performed at the company level.