Abstract: A visible light communication device management method and apparatus are disclosed. According to one aspect of the present disclosure, an object of the present disclosure is to provide an apparatus and method for checking and managing a membership of a terminal, such as a communication state and a location of a terminal managed by the server.

Abstract: A visible light communication device management method and apparatus are disclosed. According to one aspect of the present disclosure, an object of the present disclosure is to provide an apparatus and method for checking and managing a membership of a terminal, such as a communication state and a location of a terminal managed by the server.

Abstract: Disclosed are a visible light communication method and apparatus. It is one object of the present disclosure to provide an apparatus for generating data including a visible light communication device management protocol header to allow only a specific terminal to receive data transmitted by a lighting device using visible light communication, and a method therefor.

Abstract: A visible light communication device management method and apparatus are disclosed. According to one aspect of the present disclosure, an object of the present disclosure is to provide an apparatus and method for checking and managing a membership of a terminal, such as a communication state and a location of a terminal managed by the server.

Abstract: Disclosed are a visible light communication method and apparatus. It is one object of the present disclosure to provide an apparatus for generating data including a visible light communication device management protocol header to allow only a specific terminal to receive data transmitted by a lighting device using visible light communication, and a method therefor.

Abstract: A terminal having a stream control transmission protocol (SCTP)-based handover function and an SCTP-based handover method, the terminal including: a session management unit to initiate an SCTP session with a second terminal; a link layer information collection unit to store beacon signals in a link layer state information database; a signal intensity extraction unit to, if the terminal enters an overlapping area of first and second communication areas, extract an intensity of a beacon signal transmitted by a second base station managing the second communication area from the link layer state information database; and a handover unit to, if the intensity is greater than a critical value, add an IP address received from the second base station to the SCTP session, and to, if the intensity is greater than a second critical value, requests the second terminal to communicate with the terminal using the received IP address.

Abstract: A terminal having a stream control transmission protocol (SCTP)-based handover function and an SCTP-based handover methods, the terminal including: a session management unit to initiate an SCTP session with a second terminal; a link layer information collection unit to store beacon signals in a link layer state information database; a signal intensity extraction unit to, if the terminal enters an overlapping area of first and second communication areas, extract an intensity of a beacon signal transmitted by a second base station managing the second communication area from the link layer state information database; and a handover unit to, if the intensity is greater than a critical value, add an IP address received from the second base station to the SCTP session, and to, if the intensity is greater than a second critical value, requests the second terminal to communicate with the terminal using the received IP address.

Abstract: Disclosed herein is a method of constructing and managing an overlay multicast tree on the Internet. The overlay multicast tree includes a sender, one or more receivers and one or more agents for relaying data. At the first step, a new participant requests access to the overlay multicast tree from a tree manager while transmitting network characteristic information thereof to the tree manager. The second step is determining an optimal parent node in consideration of the network character information of the new participant having requested access at the first step and network characteristic information of agents participating in a currently constructed overlay multicast tree, and transmitting information of the determined parent node to the new participant. The new participant establishes data channels on the basis of the information of the determined parent node at the third step.

Abstract: A routing apparatus for guaranteeing Quality of Service (QoS) in the Internet, includes a QoS edge routing unit for receiving a request for allocating resource from a transmitting node, setting a path at a QoS data rate by signaling; at least one QoS core routing unit for receiving a request for allocating resource from the QoS edge routing unit at a transmitter, setting a path at a QoS data rate by signaling; and a QoS edge routing unit at a receiver for receiving a request for allocating resource from the QoS core routing unit, setting a first path at a QoS data rate by signaling.

Abstract: Disclosed herein is a method of constructing and managing an overlay multicast tree on the Internet. The overlay multicast tree includes a sender, one or more receivers and one or more agents for relaying data. At the first step, a new participant requests access to the overlay multicast tree from a tree manager while transmitting network characteristic information thereof to the tree manager. The second step is determining an optimal parent node in consideration of the network character information of the new participant having requested access at the first step and network characteristic information of agents participating in a currently constructed overlay multicast tree, and transmitting information of the determined parent node to the new participant. The new participant establishes data channels on the basis of the information of the determined parent node at the third step.

Abstract: A method for strictly managing group membership in Internet multicast applications is disclosed. The method comprises a group creation and enrollment step, a group announcement step, a group query step, a group information acquisition step, a group registration step, a leaving of the group step, a failure information response step and a fragment message transmission step. In the group creation and enrollment step, a group management server creates a group and performs group registration. In the group announcement step, the group management server announces the created group. In the group query step, the group management client inquires the group information of the group management server. In the group information acquisition step, the group management client joins a known group address and acquires the group information. In the group registration step, the group management client enrolls in the group management server. In the leaving of the group step, the group management client leaves the group.