Electronics and Telecommunications Research Institute

The Industry & Academic Cooperation in Chungnam National University

Kyung-Sook Kim

Hyun-Seo Park

Young-Jick Bahg

Gyung-chul Shin

Sook-Yang Kang

Je-Hun Rhee

Dong-Hee Kim

Jung-Sook Bae

Won-Don Lee

A method for supporting session mobility, more particularly, a method for supporting session mobility that can move various sessions between two or more devices by using session initiation protocol (SIP). Various sessions can be simultaneously moved by utilizing a SIP PUBLISH message. Accordingly, a user can utilize various services as they are regardless of changing of service receiving device while the user utilizes various services. Also, the session mobility can be effectively supported whether the target of the session movement is known or not.

Method for supporting session mobility

A context-aware service providing system according to an exemplary embodiment of the present invention includes a plurality of context-aware service providers and a Session Initiation Protocol (SIP) server. The context-aware service provider subscribes an SIP event for user context information based on subscriber information in the context-aware service. The SIP server manages information on the context-aware service provider (i.e., subscription requestor) and the context information obtained from the SIP event subscription request, obtains service terminal capabilities and context information of the user from SIP registration and SIP event publication of the user, and transmits SIP event notification including the context information of the user by selecting a context-aware service provider subscribing the SIP event corresponding to the context information obtained from the SIP registration and the SIP event publication.

System for providing context-aware service and method thereof

The present invention relates to a method for generating a decision tree using an inference engine in a ubiquitous environment. In the method, a data table for a data event set is generated based on information collected by at least one sensor. Subsequently, a weight value of the data event set is established, and an entropy is calculated based on the established weight value (here, the entropy is a scale for classifying the information collected by the sensor into respective classes). In addition, the decision tree for the collected information is formed based on the calculated entropy.

Method for making decision tree using context inference engine in ubiquitous environment

The SIP-based multimedia communication system for providing mobility using lifelong numbers provides mobility through SIP network service domains and a global domain. The SIP network service domain comprises a user agent and an SIP network server. The user agent transmits request/response messages between users to set up, correct, and cancel calls, and when contact information of the user agent is registered and registration of the contact information is cancelled, requests to be informed of state changes in registration information. The SIP network server performs message routing between user agents and informs the contact information of the user agents during message routing. The global domain manages the SIP network service domains and allocates global SIP identifiers, that is, lifelong numbers to users to provide user-centered mobility.

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Daejeon, South Korea

Kyung-Sook Kim