Electronics and Telecommunications Research Institute

Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Kyoung-Hee Lee

Won Geun Ryu

Hyun-Woo Lee

Il-Gu Jung

Seng-Kyoun Jo

Sung-Kuen Lee

Jeong-ho Bang

Se-Jong Oh

Kyeong-Seob Cho

Sang-Kyoun Jo

Myung-cul Kim

Eun-Jun Rhee

Provided is a node control apparatus communicating an external Internet Protocol (IP) network and managing a plurality of mobile nodes included in a local network. The node control apparatus manages information relating to the plurality of mobile nodes, each equipped with one or more wireless interfaces, configures one or more groups by classifying the plurality of mobile nodes according to the type(s) of the wireless interface(s) of each of the plurality of mobile nodes, selects a representative node for each of the groups, and allows the member nodes of each of the groups to communicate with the external IP network via their representative node. Therefore, it is possible to minimize power consumption by selectively using a wireless interface for use in connecting to the representative node of each of the groups.

Energy-saving mobile node control method using wireless multi-interfaces

An apparatus and method for virtualizing multiple terminals are provided. The apparatus includes a terminal virtualizer configured to virtualize a group of a plurality of transmitter terminals of a first user and a group of receiver terminals of a second user through the change of source and destination addresses of a packet that is transmitted between the transmitter terminal group and the receiver terminal group so that the transmitter terminal group and the receiver terminal group may be recognized as if they were single terminals. Accordingly, it is possible to provide seamless IP connectivity regardless of which terminal is currently being used by a user.

Apparatus and method for virtualizing multiple terminals

An access point, a layer 2 switch, and multicast handover supporting method using the access point and the layer 2 switch are provided. According to the method of supporting multicast handover, when a mobile node is handed over from one cell to another while being provided with a multicast service in a wireless mobile communication network, the L2 switch performs multicast traffic routing in response to reception of MAC address information and multicast service source and group information from the access point. Hence, multicast traffic can be supported to be fast and seamlessly handed over within layer 2 network equipment.

Access point, L2 switch and method of supporting multicast handover using the access point and L2 switch

A handoff system and method between different kinds of devices, an SIP server and an application method of the SIP server applied thereto. The handoff system between different kinds of devices includes a plurality of devices; a SIP server which requests a routing path update when a handoff request signal is input from a source device among the plurality devices, and getting a target device to participate in a current session; and a gateway which updates a predetermined routing path when a request signal for the routing path update is input, and transmitting data to the source device and the target device via the updated routing path.

Handoff system and method between different kinds of devices, SIP server and operational method of SIP server

Growing community of inventors

Daejeon, South Korea

Kyoung-Hee Lee