As network technologies evolve in two areas - peer-to-peer technology and nomadic technology - new types of services provided through a ubiquitous environment will be created. To allow users to enjoy services in a ubiquitous environment, services that are appropriate to users' needs and desires must be created and discovered. In this paper, we describe the Ubiquitous Service-Oriented Network (USON). The USON is a network architecture for providing future networking services based on ubiquitous technologies. It is based on three technologies - a service composition core technology, a state-acquisition technology, and a network reflective technology. Services provided through the USON will consist of autonomous distributed service elements (SEs). We describe the architecture, implementation, and an example of the USON, and explain how it will provide user services through a ubiquitous environment.
