Abstract: A header compression and packet transmission method in a sensor network and an apparatus therefor, for selecting technologies related to Internet Protocol (IP) header compression according to characteristics of each node, and processing the technologies. The header compression and packet transmission method and apparatus therefor distinguishes a node supporting the adaptation layer function and a node that does not support the adaptation layer function, and determines whether to compress the packet, thereby enabling a node transmitting data to transmit the data having a proper form that is acceptable to a sensor node receiving the data. By doing so, an efficient packet transmission is possible.

Abstract: A fast handover apparatus, method, and medium for performing a fast handover in a wireless LAN environment. The fast handover method includes (a) determining whether a beacon signal input from an access point (AP) to a mobile node (MN) contains border information indicating that the AP is located at the border of its subnet, the AP connecting the MN to a wired network; and (b) selectively performing a handover between subnets based on the determination results obtained in (a). Accordingly, unnecessary communications between an MN and an AR are prevented by providing predetermined information, based on which the MN can determine whether to perform only an L2 handover or both the L2 handover and an L3 handover.

Abstract: A technology of detecting MIHP information before an OSI layer 3 process is performed. A method of performing Media Independent Handover (MIH) includes analyzing a field for indicating Internet Protocol (IP) version information, if a value of the field for indicating IP version information corresponds to an MIH layer, performing a process of the MIH layer and performing a process of an IP layer, and if a value of the field for indicating IP version information does not correspond to the MIH layer, directly performing the process of the IP layer. Accordingly, an IP layer that is the third layer of the OSI 7 layers can determine without performing a separate operation whether an MIH process is performed. Thus, a delay of a processing speed of a device can be prevented, resulting in an increase of QoS of a network.

Abstract: An apparatus and method of providing, and an apparatus and method of requesting, current handover information between network devices, the method of providing the current handover information for a handover of a mobile terminal between networks including: detecting handover information regarding an environment of a network of a handover information providing apparatus if the environment of the network changes, and transmitting a message including the handover information regarding the changed environment from the handover information providing apparatus to a handover information storage apparatus. Accordingly, since the handover information storage apparatus maintains the current handover information and provides the current handover information to the mobile terminal, the mobile terminal performs the most correct determination when performing a handover.

Abstract: An apparatus for managing information about a mobile network service in a server that manages a network providing the mobile network service, including an information change identification unit which identifies a change in the information about the mobile network service, an information transmission unit that transmits a message including the changed information to an information server, and a positive acknowledgement message receiving unit that receives from the information server a positive acknowledgement message that represents acceptance of the changed information. When information about the network service is changed, a message including the changed information is transmitted to the information server, and the message is re-transmitted to the information server a predetermined number of times until the information server transmits an ACK response that indicates acceptance of the changed information.

Abstract: A method and apparatus for communicating data. The method of receiving data by a first device from a second device includes generating a session initiation protocol (SIP) message including information on a data reception environment of the first device; transmitting the generated message to the second device; and receiving data transmitted by the second device based on the transmitted information. Accordingly, data transmission in consideration of a reception environment of a device for receiving data is possible, so that the quality of a data service is guaranteed.

Abstract: A handover apparatus and handover method in a DHCPv4 environment, and a medium having instructions for performing the method, the handover apparatus and method request a DHCP server to acknowledge an IP address lease and receive acknowledgement of the IP address lease as a response to the request.

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 apparatus for configuring an (Internet protocol) IP address, an information server, and an information storage medium storing a data format of a message therefor. The method includes obtaining information on a method of configuring an IP address of a new network after a handover is performed by using an IS (information server); and configuring the IP address using the method of configuring the IP while a mobile terminal accesses the new network, thereby avoiding an unnecessary delay due to an address configuration method that is not supported in the new network, and configuring the IP address quickly and efficiently.

Abstract: A method and apparatus for configuring an (Internet protocol) IP address, an information server, and an information storage medium storing a data format of a message therefore. The method includes obtaining information on a method of configuring an IP address of a new network after a handover is performed by using an IS (information server); and configuring the IP address using the method of configuring the IP while a mobile terminal accesses the new network, thereby avoiding an unnecessary delay due to an address configuration method that is not supported in the new network, and configuring the IP address quickly and efficiently.

Abstract: A method and apparatus of performing handover in a mobile node using an intrinsic value of a point of attachment (PoA), a method of transmitting handover information to the mobile node, and an information server. The method of performing handover in a mobile node includes determining an intrinsic value of a current PoA to which the mobile node is connected; and performing handover using the determined intrinsic value. The mobile node that does not include a GPS or does not support a specific protocol transmits the location thereof to an IS using an PoA identifier that is an intrinsic value of a current PoA to which the MN is connected, so that the IS can be informed of the current PoA, and quickly and promptly determine adjacent PoAs for performing handover.

Abstract: An apparatus and method for securing media access control (MAC) addresses in a wireless local area network (LAN) environment are provided. In the method of securing MAC addresses, a cryptographically generated address (CGA) is generated using a predetermined cipher algorithm, a ciphered MAC address is extracted from the CGA, and communication is performed using the ciphered MAC address. Accordingly, it is possible to strengthen the security of MAC addresses.

Abstract: A method and apparatus for generating an IPv6 unique local address (ULA) are provided. The method includes generating a 64-bit first value using unique information on a UPnP device used by a router; generating a modified 64-bit EUI-64 using unique information on an interface device used by the router; generating a 128-bit second value by concatenating the 64-bit first value and the modified EUI-64; generating a 160-bit third value by applying SHA-1 to the 128-bit second value; and generating a global ID by extracting 40 bits from the 160-bit third value. A global ID is generated using unique information on an UPnP device and an interface device and the IPv6 ULA is generated using the global ID, thereby generating the IPv6 ULA having uniqueness in an entire IPv6 address system without an NTP.

Abstract: A quality of service (QoS) securing apparatus and method using a communication protocol is provided. The QoS securing method is performed by a reception side that is receiving data from a transmission side. The method includes generating information about a changed communication environment according to a change in a communication environment of the reception side, and transmitting the information to the transmission side. An exchange of information about a communication environment using the communication protocol between the reception side and the transmission side can inform the transmission side about resources of the reception side, link characteristics, characteristics of a link on a transmission path, etc., thereby securing a QoS of data communication between the reception side and the transmission side.

Abstract: Provided are an efficient handover apparatus and method in a mobile node. In the method in which a handover is performed in a mobile node which establishes a data communication through a point of attachment (PoA), the method including receiving information regarding capabilities of a new PoA; determining whether Internet protocol version 6 (IPv6) prefix is available at the new PoA, based on the information regarding the capabilities of the new PoA; and generating an address which is to be used by the mobile node in a data communication with the new PoA, according to a method determined based on whether IPv6 prefix is available at the new PoA. Thus, it is possible to determine whether IPv6 prefix is available at a new point of attachment prior to receiving a RA message.

Abstract: Provided are an efficient handover apparatus and method in a mobile node. In the method in which a handover is performed in a mobile node which establishes a data communication through a point of attachment (PoA), the method including receiving information regarding capabilities of a new PoA; determining whether Internet protocol version 6 (IPv6) prefix is available at the new PoA, based on the information regarding the capabilities of the new PoA; and generating an address which is to be used by the mobile node in a data communication with the new PoA, according to a method determined based on whether IPv6 prefix is available at the new PoA. Thus, it is possible to determine whether IPv6 prefix is available at a new point of attachment prior to receiving a RA message.

Abstract: A data stream transmitting and receiving method and apparatus guaranteeing quality of service (QoS), in which the data stream transmitting method includes obtaining information regarding a link characteristic change of a mobile node, which occurs due to a handover of the mobile node between heterogeneous links, and transmitting the data stream to the mobile node based on the obtained information. Accordingly, even when the handover of the mobile node between heterogeneous links is performed, QoS of the data stream can be guaranteed.

Abstract: A method of performing handover using subnet information includes: comparing subnet information for the current PoA with subnet information for the new PoA; and determining a layer in which handover is performed, according to whether the subnet information for the current PoA is equal to the subnet information for the new PoA, and performing handover in the determined layer. By comparing subnet information received before a mobile node moves with subnet information received after the mobile node moves, and thus quickly determining whether a change between subnets occurs, and by determining a layer in which handover is performed on the basis of the determination result, it is possible to efficiently perform handover.

Abstract: Provided are a method and apparatus for searching for and acquiring handover information using a Dynamic Host Configuration Protocol (“DHCP”). The handover information searching and acquiring method includes: receiving the location information of an information server, which can provide the handover information, from a Dynamic Host Configuration Protocol (DHCP) server; accessing the information server using the location information; and receiving the handover information from the information server. By receiving the location information of an information server, which can provide handover information, using DHCP, and by receiving the handover information from the information server using the location information, it is possible to quickly and efficiently search for and acquire handover information.

Abstract: A method and apparatus to provide a handover includes an input unit which receives information on a handover mode and a handover priority corresponding to a plurality of wireless networks, a signal-intensity-measuring unit which measures a signal intensity of a wireless network where a current communication is performed out of the plurality of wireless networks, and a control unit which performs a mobile node handover to a predetermined wireless network according to the information about a handover mode and a handover priority, if the measured signal intensity is less than a threshold intensity value.