Patent ID: 8208468

Claim:
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.