Abstract: Provided are wireless communication methods and apparatus. The communication method for a mobile station in which multiple interfaces complying with different communication standards are loaded includes obtaining an address that can be used for communication through every one of multiple interfaces based on information regarding a predetermined interface among the multiple interfaces; and performing communication through one of the multiple interfaces using the obtained address. The mobile station has no need to generate an IP address for each of the multiple stations.

Abstract: A handover supporting method and apparatus and a handover method and apparatus are provided. The handover supporting method includes generating a frame, which contains information necessary for generating an address of the first access point; and transmitting the frame to the second access point. Accordingly, access points can communicate with each other even during a handover triggered by movement of the mobile station between different subnets, i.e., even during a handover in an IP layer.

Abstract: An Internet connection service method, system, and medium used with mobile nodes. The Internet connection service method, system, and medium can switch a mobile node between network service areas having different extended service set identifiers (ESSIDs) by simplifying a process of re-authenticating a mobile node. The Internet connection service method includes: receiving an inter-access point protocol (IAPP) message containing authentication information on the mobile node from an access point (AP) of a network service area, to which the mobile node currently belongs; and transmitting the IAPP message to an AP of at least one network service area having different identification information from the network service area, to which the mobile node currently belongs.

Abstract: A method of and a device for communication between a client and server using a flexible address. The method of receiving a flexible address includes: transmitting a request for communication with a server to a proxy, which retains the flexible address of the server; and receiving a response, which includes the flexible address from the server which received the communication request relayed by the proxy. This enables the client to independently communicate with a server which has a flexible private IP address.

Abstract: A method, medium, and an apparatus for connecting heterogeneous protocol nodes including receiving first data through a first socket, with data transferred from a corresponding first node uses a first protocol, and transmitting the received first data for a second node, through a second socket, with the second node using the second protocol, whereby the nodes using heterogeneous protocols can be connected with each other.

Abstract: A tunneling service method and system enabling data communication between different networks, in which an address of a tunneling service server used in a client node can be easily designated, the tunneling service method includes: transmitting an information request message, which requests information required for connection to the network, to a dynamic host configuration protocol (DHCP) server selected by the client node; receiving an acknowledgement message, which contains an address of the tunnel router, from the DHCP server selected by the client node; and the client node detecting the address of the tunnel router contained in the acknowledgement message and generating a packet for a tunneling service using the detected address of the tunnel router.

Abstract: A method, medium, and apparatus for assuring duplicate address detection. The method includes: determining whether a predetermined packet is related to a duplicate address detection, and if the packet is determined to be related to the duplicate address detection, modifying a source address of the predetermined packet to another predetermined address different from the source address. Proper duplicate address detection can be assured even in an environment where multicast packet filtering is based on a link layer source address that follows the IEEE 802.11 standard.

Abstract: Communication handover methods and apparatuses for use in an environment involving terminals having mobile nodes moving at a high speed. The handover method includes actively requesting handover to an access router based on the moving speed of a mobile node. The handover methods and apparatuses reduce handover latency and packet losses in a handover process of a terminal moving at a high speed.

Abstract: A method and a system for initiating a session with a mobile node using a session initiation protocol under mobile Internet protocol version 6 (IPv6) are provided. The method includes: a caller transmitting a first invite message to an integrated home server; an integrated home server transmitting second location information of a callee to a caller; and the caller directly transmitting a second invite message to the caller using the second location information of the callee.

Abstract: 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.

Abstract: 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.

Abstract: An apparatus and method for selecting one among multiple Internet service providers (ISPs) and routing using the selected ISP are provided. The method includes exchanging an address of a second ISP replacing a first ISP that has stopped an Internet access service and an address of an external node that has been connected to the first ISP, and transmitting a data packet having the address of the external node as a next destination address.

Abstract: 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.

Abstract: 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.

Abstract: Provided are a handover method and apparatus in a WLAN environment and an ICMP message used in such a WLAN environment. The handover method involves a) issuing a request for distributed information table (DIT) information, which is network information on access routers, to an access router of a Basic Service Set that a mobile node belongs to when booted; b) receiving DIT information from the access router and storing the received DIT information; and c) performing binding update using the stored DIT information.

Abstract: A router and a routing method for providing linkage with mobile nodes are provided. The router exchanges a packet between a mobile node and correspondent nodes, by performing authentication for purposes of security, binding update, and packet conversion, etc. The router and the routing method allow the mobile node to directly communicate with correspondent nodes that do not include functions for communicating with the mobile node.

Abstract: A method of transmitting a binding update (BU) message, a method of transmitting a binding acknowledgement (BACK) message, the structure of the BU message, the structure of the BACK message, a mobile node that performs BU, and a home agent that performs BU. The method of transmitting a binding update (BU) message contains an identifier that indicates whether there is a request for slave home agent information, in a mobile IPv6 environment. Here, the slave home agent information is information on a slave home agent which neighbors a master home agent that receives the BU message.

Abstract: 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.

Abstract: 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.

Abstract: 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.