Samsung Electronics Co., Ltd.

Pyung-soo Kim

Young-keun Kim

Soo-Hong Park

Sun-woo Kim

Jae-hwang Lee

Min-ho Lee

Hak-goo Lee

A handover apparatus and a handover method performing a fast handover in an environment of various communication networks having different communication standards, the handover method, which is performed in a mobile node (MN) that moves between different types of networks, including determining whether a signal received from a node that connects the MN to a first type network contains network information indicating that the MN moves from the first type network to a second type network; and selectively performing a handover between the first and second type networks based on the determination results. Therefore, the MN can predict whether it moves to a new network, thereby performing a fast handover.

Handover method and handover apparatus

An apparatus for and method of acquiring an address in a Dynamic Host Configuration Protocol (DHCP) environment in a wireless LAN. The method includes: sensing that a mobile node has moved from a first network to a second network; transmitting a frame requesting association with the second network to an access point managing the second network after sensing that the mobile node has moved from the first network to the second network; and receiving a message containing an address assigned to the mobile node from the access point having received the transmitted frame. Accordingly, the mobile node can promptly acquire an IP address without an additional request.

Method and apparatus for acquiring IP address in DHCP environment

An apparatus and method for supporting mobility of a mobile terminal in a wireless local area network (LAN) environment deploying mobile IP are provided. The method for registering a mobile node using a virtual mobile node comprises: detecting whether or not a mobile node traveling among a plurality of networks is connected; and registering information on the mobile node whose connection is detected, with an agent relaying communication between the mobile node and a correspondent agent. By doing so, even when a mobile IP module is not installed, the mobile node can perform wireless communication seamlessly between networks in a wireless LAN environment deploying mobile IP.

Method and apparatus for registering mobile node in a wireless local area network (LAN) environment

A handover method in a wireless local area network (WLAN) environment, a mobile node device that carries out a handover in a WLAN environment, and a beacon signal structure are provided. The handover method involves receiving a beacon signal containing access router identification information; and carrying out a handover based on the access router identification information contained in the beacon signal. The mobile node device includes a beacon signal reception unit for receiving a beacon signal containing access router identified information, a determination unit for comparing access router identification information from the beacon signal with that of a previous access router and a handover performing unit for carrying out a handover based on a result of the determination from the determination unit. The beacon signal structure, which is used for carrying out a handover in a WLAN environment, includes a reserved field into which access router identification information is inserted.

Handover method in WLAN and mobile node device performing handover in WLAN

An IP packet version converting apparatus and method, the IP packet header converting method includes recognizing one of fields of a header of an IP packet of a first type, in which a value regarding an expansion function is recorded, the expansion function being incompatible between the IP packet of the first type and an IP packet of a second type; and converting the field recognized in one of the fields of the header of the IP packet into a field compatible with the IP packet of the second type.

IP packet version converting apparatus and method

A method and system for interconnecting an Internet protocol version 4 (IPv4) network and an Internet protocol version 6 (IPv6) network are provided. The system for interconnecting an IPv4 network and an IPv6 network includes IPv4 nodes, IPv6 nodes, and apparatuses for transmitting IP packets between the IPv4 nodes and the IPv6 nodes, wherein the apparatuses for transmitting IP packets share processing state information of the IP packets, using a predetermined message, to distribute their load of processing the IP packets. The IPv4-IPv6 interconnection method involves appropriately arranging NAT-PT apparatuses depending on the size of the networks such that packet processing speed and performance are improved over the use of a single NAT-PT apparatus.

Method and apparatus for interconnecting IPv4 and IPv6 networks

A method and apparatus for managing a mobile Internet protocol (IP) using network address translation (NAT) in a mobile network are provided. The method includes periodically receiving an agent information message from an agent on a network, and checking a connection to a home network or a foreign network. If a connection to the home network is determined based on the agent information message, a global IP address received from the agent of the home network and local IP addresses set a plurality of hosts included in the mobile network are registered, and communication with the home network is performed through conversion between the registered global IP address and each of the registered local IP addresses. If a connection to the foreign network is determined based on the agent information message, a temporary IP address is received from the agent of the foreign network. The temporary IP address is registered with the local IP addresses set at the hosts, and communication with the foreign network is performed through conversions between the registered temporary IP address and each of the registered local IP addresses.

Method and apparatus for managing internet protocol using network address translation in mobile network

Provided are a system and method for deleting tunneling when a correspondent node is connected to a mobile node that has moved to a different network. The system includes a domain name service server, a mobile node that moves to a different network, a domain name dynamic updating server, and a correspondent node. The domain name service server manages domain names and address of a plurality of mobile nodes. Once the domain name dynamic update server receives a message including the created address by the mobile node, the domain name dynamic update server updates domain name and address of the mobile node that are registered in the domain name service server using the domain name and address contained in the received message. The correspondent node connects to the domain name service server, obtains the updated address of the mobile node, and transmits a packet to the mobile node using the obtained address.

System and method for deleting tunnelling in connection between mobile node and correspondent node

A handover method and a handover device for a mobile node in a wireless LAN environment are provided. The handover method involves a) scanning beacon signals transmitted from neighboring access routers while a mobile node moves from place to place; b) predicting a new access router (NAR) based on the beacon scanning results; c) obtaining information on the predicted NAR before an L2 trigger of a link layer occurs; and d) carrying out binding update using the information on the predicted NAR when the L2 trigger of the link layer occurs.

Handover method and device for mobile node in wireless LAN

A data displaying method includes, when a user draws up character messages to be transmitted, the character messages to be transmitted are displayed on one display window. If a window division function is selected, after determining what kind of function is selected, the display window into two display windows, and then the character messages being drawn up are displayed on one of the two divided display windows and data corresponding to the selected function is displayed on the other display window. As a result, the user can carry out another telephone function without losing the character messages being drawn up while drawing up the character messages to be transmitted. Also, the user can carry out smooth communications using character messages.

Portable telephone and method of displaying data thereof

A fault and noise tolerant system and method for obtaining an original signal which is not influenced by a fault or noise occurring in an electronic equipment. The fault and noise tolerant system includes a first estimation filter for estimating an original signal from a signal output from the electronic equipment, considering noise of the electronic equipment; a second estimation filter for estimating the original signal and a fault signal from the signal output from the electronic equipment, considering a fault and the noise; a fault detection unit for detecting the presence or absence of a fault in the electronic equipment based on the estimated fault signal received from the second estimation filter; and a selection unit for selecting one of the estimated original signals from the first and second estimation filters, respectively, according to the result of detection of the fault detection unit. Accordingly, it is possible to obtain the signal of the electronic equipment that is not influenced by the fault and noise of the electronic equipment.

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Seoul, South Korea

Pyung-soo Kim