Abstract: A fast handover method optimized for IEEE 802.11 networks. In a wireless local area system including a mobile terminal and at least two wireless access points (APs) that communicate with the mobile terminal over a unique radio channel, the fast handover method includes receiving a beacon frame signal from the serving AP and the neighbor APs of the mobile terminal; generating a first signal to determine a state of each of the neighbor APs based on the beacon frame signal received from each of the neighbor APs; comparing the first signal with predefined thresholds, classifying the neighbor APs into a detected AP, a candidate AP, and a target AP according to a result of the comparison, and storing the classification result in a neighbor AP list; and selecting an AP for the handover based on the classification result in the neighbor AP list.

Abstract: An apparatus for and method of supporting network-based mobility for a dual stack terminal are provided. More particularly, a mobile anchor point (MAP) apparatus for binding and data transmission of a dual stack terminal which has moved from a dual network to an Internet Protocol version 4 (IPv4) network or an Internet Protocol version 6 (IPv6) network, and a method of implementing the MAP apparatus are provided. If the IPv6, which is a next-generation Internet protocol, begins to be applied to networks, a dual stack terminal supporting both the IPv4 and IPv6 will also be introduced. In an environment in which this dual stack terminal moves, movement of the dual stack terminal to an IPv4-only network or an IPv6-only network as well as movement between IPv4/IPv6 dual networks will be considered. According to the apparatus and method, a MAP used in a conventional network-based mobility supporting method is extended.

Abstract: The present invention relates to a wireless network, and more particularly, a method (*“and system”?*) which a mobile station discovers a neighbor network in an Internet protocol based wireless network, a network management server for enabling the method, and a method of operating the network management server.

Abstract: A method of electing a leader node in an ad-hoc network including a plurality of nodes in the ad-hoc network transmitting node solicitation (NS) messages and calculating distances between the plurality of nodes using information included in the NS messages, determining whether the plurality of nodes are candidate leaders by calculating center position values based on the distances calculated by each of the nodes, and electing the leader node based on information included in leader election option messages transmitted by each candidate leader.

Abstract: A method of managing a mobility profile of a mobile node that uses a local mobility agent for managing a local mobility domain. The method includes obtaining and recording local temporary addresses, connection link temporary addresses and binding update times of the respective mobile nodes in a cacheable memory of the local mobility agent, calculating stay times of the respective mobile nodes on the presently linked subnet using information recorded in the cacheable memory and recording the stay times of the respective mobile nodes in a storage device of the local mobility agent, calculating an average stay time of the respective mobile nodes on the presently linked subnet by accumulating the stay times recorded in the storage device and recording the average stay time in the storage device of the local mobility agent.

Abstract: A fast handoff method of an Access Router includes receiving and storing at an Access Point a Router Advertisement message periodically sent from the Access Router to which the Access Point is connected, the Access Point being connected to at least one mobile node in wireless manner and supporting services to the at least one mobile node; generating at least one Care-of Address (CoA) at the Access Point, performing Duplicate Address detection, and storing the CoAs for which the Duplicate Address detection is successfully completed; forming, when a new mobile node enters a service-available range of the Access Point, a link to the new mobile node at the Access Point, including any of the stored CoAs in the Router Advertisement message, and sending the Router Advertisement message including the stored CoA to the new mobile node; and communicating the new mobile node to a network using the CoA included in the sent Router Advertisement message.

Abstract: A method is provided for reserving a new CoA in advance for a mobile node. The method for reserving the new CoA includes transmitting to the router a CoA reservation solicitation message including a link layer address of the mobile node from the mobile node; transmitting to the adjacent router the CoA reservation solicitation message including the current CoA and the link layer address of the mobile node the from router; generating a new CoA from the adjacent router and performing a duplicate address check on the new CoA to establish the new CoA; and storing the established new CoA in a proxy table that is managed by the adjacent router to perform the proxy.

Abstract: A method of managing a mobility profile of a mobile node that uses a local mobility agent for managing a local mobility domain. The method includes obtaining and recording local temporary addresses, connection link temporary addresses and binding update times of the respective mobile nodes in a cacheable memory of the local mobility agent, calculating stay times of the respective mobile nodes on the presently linked subnet using information recorded in the cacheable memory and recording the stay times of the respective mobile nodes in a storage device of the local mobility agent, calculating an average stay time of the respective mobile nodes on the presently linked subnet by accumulating the stay times recorded in the storage device and recording the average stay time in the storage device of the local mobility agent.

Abstract: Disclosed is a method for fast handover in a wireless security data communication environment. The fast handover method for a mobile node connected to a network via an access point to perform a data communication in a wireless communication environment according to the present invention includes: performing an authentication while communicating with an authentication server having registration information about the mobile node via an uncontrolled port of the access point so as to make the mobile node connected to the network; performing a mobile Internet Protocol (IP) registration for binding a Care-of-Address (CoA) to a home agent and a correspondent node (CN) via the access point in parallel with performing the authentication; and opening a control port of the access point and relaying data transceived at the mobile node using the CoA when the authentication and the registration being successfully completed. Accordingly, a fast handover of the mobile node can be supported.

Abstract: A network emulation device and method in a terminal of an IEEE 802.16 communication system supporting IPv6 communications based on a Neighbor Discovery (ND) protocol are provided. The terminal includes an IPv6 module for performing an ND mechanism to search for a neighbor terminal or a router, a MAC module for communicating based on the IEE 802.16 standard, and a network emulation module provided between the IPv6 module and the MAC module for analyzing a ND message received from the IPv6 module and discarding the ND message or generating a response message for the ND message according to the message type. The network emulation module converts a broadcast ND message to a unicast message and provides the unicast message to a corresponding network device if network information needed to internally generate the response message is not collected.

Abstract: A mobile station and method for neighbor discovery are provided. The mobile station comprises a mapping table storing a connection identifier (CID) prefix and a neighbor identifier, a controller generating a CID with respect to a message that will be transmitted by referring to the mapping table, and a message transmitter transmitting, by using the CID, the message to a base station connected to the mobile station.

Abstract: Provided is a method of generating and managing a connection identifier (CID) for supporting an IPv6 multicast in a wireless network based on IEEE 802.16 and a network interface using the method. Further provided is a network interface included in a node of IPv6-based wireless network, the network interface includes a MAC driver for storing at least one multicast CID and a MAC address of the node which is mapped in the at least one multicast CID, and a control unit for receiving a multicast message which is transmitted from a base station, and transferring the multicast message to an IP layer, when the multicast message includes the multicast CID which is stored in the MAC driver.

Abstract: A method of configuring and registering an Internet Protocol (IPv6) address in a wireless mobile communication system having a connection-oriented radio link is provided. In an IP configuration method without Duplicate Address Detection (DAD), a Mobile Station (MS) is allocated a unique Connection Identifier (CID) specific to the MS from a serving Base Station (BS), and the MS and BS configure the IPv6 address independently using a known network prefix, a Medium Access Control (MAC) address of the MS, and the allocated CID. The BS registers the configured IPv6 address to a HA on behalf of MS.

Abstract: A method and apparatus for supporting a multicast/broadcast in a wireless communication system are provided. A multicast/broadcast method receives an Internet Protocol (IP) packet from an upper layer, determines whether a multicast destination address or a broadcast destination address is contained in the received IP packet, and transmits a packet in which a connection identifier (CID) for the multicast or the broadcast is selectively attached to the received IP packet according to a result of the determination. Also, the multicast/broadcast method may receive an IP packet from a mobile station, determine whether a first CID for the multicast or the broadcast is contained in the received IP packet, and transmit a packet in which the first CID of the received IP packet is selectively replaced with a second CID according to a result of the determination.

Abstract: An apparatus and method for providing a seamless communication service in a mobile communication system. The method includes transmitting a first message to a base station when an IP subnet has been changed due to movement of the portable terminal, the first message including a Medium Access Control (MAC) address of the portable terminal, receiving IP address information from the base station, which can be used in a new IP subnet, and configuring a new IP address based on the received IP address information.

Abstract: A mobile network is disclosed in which there exists a Mobile Node (MN), the MN is managed by a first Access Router (AR), and there exists a second AR with a subnet different from the first AR. A method is provided for the MN performing a fast handoff from the first AR to the second AR, which includes receiving a Routing Advertisement (RA) message of the second AR from the first AR, generating an IP address to be used in the second AR using the RA message of the second AR if the MN recognizes that it should perform a handoff from the first AR to the second AR, performing a trigger for using the generated IP address if the movement to the second AR is completed, and transmitting/receiving a Correspondent Node (CN) and data using the IP address.

Abstract: A handover method of a mobile station (MS) in a mobile communication system having MSs and radio access stations (RASs), each of which includes an IEEE 802.16 standard-based medium access control (MAC) layer and an Internet protocol version 6 (IPv6)-based IP layer. The handover method includes the step of gathering IP network information of a neighbor RAS through a message exchange with a previous RAS. A target RAS for handover based on the gathered IP network information of the neighbor RAS is determined, after the target RAS is determined, the previous RAS tunnels data for targeting the MS to the target RAS, Then the tunneled data are received from the target RAS.

Abstract: An apparatus for a fast reactive handover in an Internet Protocol version 6 (IPv6) mobile system is provided, in which a message receiver receives a new connection notification message from a point of attachment when the point of attachment makes a new connection with a mobile unit, and a message transmitter sends a router advertisement (RA) message to the mobile unit in response to receiving the new connection notification message.

Abstract: A system and method for a mobile device to learn information about the access networks within its neighborhood is disclosed. In certain embodiments, information about networks in a neighborhood of a particular network is stored in a database associated with a dynamic host configuration protocol server. Periodic beacons of an access point of at least one network identified in the database are received by mobile stations. One of the mobile stations requests capability and configuration information of one or multiple target networks or all networks in the database. The requested capability and configuration information is provided to the mobile station.

Abstract: A network discovery method in a heterogeneous network environment. The network discovery method includes receiving neighbor information indicating neighbor PoAs from a MIIS entity at a mobile node that includes a plurality of communication interface sections capable of communicating with different networks; checking at least one neighbor PoA using the neighbor information at the mobile node; and activating a communication interface section corresponding to the checked neighbor PoA at the mobile node. Accordingly, the neighbor networks can be discovered under the heterogeneous network environment and unnecessary power consumption can be avoided.