Abstract: Provided are a wireless local area network (LAN) network, a mobile station and a base station, and a method of controlling handoff in the wireless LAN network. The wireless LAN network includes a mobile station and a number of base stations. The mobile station notifies a previously connected first base station of an entry into a power-save mode, performs a handoff process with a second base station, and then notifies the first base station of an exit from the power-save mode. Each of the base stations buffers a packet to be transmitted from a public network to the mobile station when the each of the base station is notified of the entry into the power-save mode by the mobile station, and transmits the buffered packet to the mobile station when the each of the base station is notified of the exit from the power-save mode by the mobile station. This wireless LAN network system and method is capable of performing handoff without packet loss.

Abstract: A method and system for supporting mobility of a mobile node in which, when it is recognized that the mobile node has moved into a foreign sub-network, the mobile node is allocated, by its home sub-network, a new Internet protocol address suitable for a prefix of the foreign sub-network after movement when moving out of an area of the home sub-network into the foreign sub-network so that route optimization is implemented. Since direct communication is made between a mobile node and a correspondent node without passing a network where the mobile node existed before movement, it is possible to implement the route optimization. There is no generation of packet overhead since Internet protocol tunneling technology is not applied upon routing.

Abstract: Disclosed in the present invention is a method for supporting mobility of a mobile node between subnetworks in a wireless local area network that includes a plurality of subnetworks networked through Internet and assigns a different Internet protocol (IP) address to the plural subnetworks, respectively, the method comprising the steps of: if the mobile node moves arbitrarily to a second subnetwork from a first subnetwork during communication, broadcasting a first message, in which a foreign mobile access server (MAS) of the second subnetwork includes the mobile node's medium access control (MAC) address; acquiring, at a home mobile access server of the first subnetwork, an address of the foreign mobile access server from the first message, and then transmitting a second message including an address of the home mobile access server and an Internet protocol address of the mobile node to the foreign mobile access server in reply to the first message; and routing, at the foreign mobile access server and the home

Abstract: In a wireless LAN system, an apparatus for controlling load balance of multi-access points and a method thereof prevent load from being concentrated on a specific access point by comparatively evaluating received load values of many access points after receiving the load values from the access points, and enabling the access point having the concentrated load to reject terminal access or remove prior-accessed terminals. The apparatus comprises: wireless LAN terminals having wireless LAN interfaces and receiving a wireless LAN service; access points providing the wireless LAN service to the wireless LAN terminals, periodically transmitting load state information, and suppressing an increase of load when a load suppressing signal is received; and a management system comparatively evaluating load states of each access point by receiving the load state information from the access points, and transmitting a load increase suppressing signal to access points under certain conditions.

Abstract: A method and system or access point (AP) for performing a data transmission process supporting power management of wireless local area network (WLAN) clients comprises the steps of and means for performing the following functions, respectively: when data are received through a network, storing the data selectively, wherein the received data are not stored in a memory when a current operation timing is in a first timing interval, and the received data are stored in the memory when the current operation timing is in a second timing interval; generating a beacon frame after determining whether data to be transmitted to the WLAN clients are stored in the memory according to a beacon frame generation interval; transmitting the generated beacon frame to the WLAN clients every beacon interval; and, when the transmission of data stored in the memory during the second timing interval is requested from the WLAN clients, transmitting the appropriate data to the WLAN clients.

Abstract: Provided are a wireless local area network (LAN) network, and a mobile station and method of controlling handoff in the wireless LAN network. The method includes the steps of: transmitting and receiving, at a mobile station, a data packet to and from a currently connected first base station using a first antenna; scanning, at the mobile station, an adjacent base station using a second antenna and establishing a link with a second base station detected by the scanning operation; and after establishing, at the mobile station, the new link, comparing communication environments of the first and second base stations and selecting a base station providing a better communication environment. According to the system and method of controlling handoff in a wireless LAN network, a connection with a previous base station can be maintained while establishing a link with a new base station. Consequently, it is possible to prevent packet transmission delay and packet loss that may be caused by handoff.

Abstract: Provided are a wireless local area network (LAN) network, a mobile station and a base station, and a method of controlling handoff in the wireless LAN network. The wireless LAN network includes a mobile station and a number of base stations. The mobile station notifies a previously connected first base station of an entry into a power-save mode, performs a handoff process with a second base station, and then notifies the first base station of an exit from the power-save mode. Each of the base stations buffers a packet to be transmitted from a public network to the mobile station when the each of the base station is notified of the entry into the power-save mode by the mobile station, and transmits the buffered packet to the mobile station when the each of the base station is notified of the exit from the power-save mode by the mobile station. This wireless LAN network system and method is capable of performing handoff without packet loss.

Abstract: In a system and method for transmitting data in a wireless local area network (WLAN), the system includes: a wireless station which, when a No Acknowledge (ACK) function of the WLAN is applied, transmits a No ACK request message based on a protection mechanism according to a frame transmission condition based on link status packet information which is transmitted from an upper layer; and an access point for sequentially receiving a frame from the wireless station without a delay time depending on the No ACK request message received from the wireless station. The method comprises steps corresponding to the above functions of the wireless station and the access point of the disclosed system.

Abstract: A frame processing method in a wireless local area network includes: confirming quality status according to signal level value of a frame received via a wireless medium, error status of a frame or receipt status of an acknowledgment frame in response to frame transmission; determining split size information of a transmitting frame according to the quality status; and upon generation of the transmitting frame, splitting and transmitting the transmitting frame according to size information of the transmitting frame and the split size information. The frame size is optimized when frames are transmitted between an access point (AP) and a station, thereby maximizing a service area that the AP can cover while maximizing frame transmission rate.

Abstract: A method and system for supporting mobility of a mobile node in which, when it is recognized that the mobile node has moved into a foreign sub-network, the mobile node is allocated, by its home sub-network, a new Internet protocol address suitable for a prefix of the foreign sub-network after movement when moving out of an area of the home sub-network into the foreign sub-network so that route optimization is implemented. Since direct communication is made between a mobile node and a correspondent node without passing a network where the mobile node existed before movement, it is possible to implement the route optimization. There is no generation of packet overhead since Internet protocol tunneling technology is not applied upon routing.

Abstract: An apparatus and method for processing packets in a Wireless Local Area Network (WLAN) access point includes a WLAN access point cooperated with the WLAN parses the received packets, determines whether the received packets are voice packets which must be preferentially processed or signaling packets of a protocol related to a call control in order to guarantee a quality of VoIP service, gives a priority to the corresponding packets in a differentiated manner according to the determined result, and preferentially processes the packets given a high priority. Thus, it is possible to guarantee the quality of VoIP service.

Abstract: A method and system or access point (AP) for performing a data transmission process supporting power management of wireless local area network (WLAN) clients comprises the steps of and means for performing the following functions, respectively: when data are received through a network, storing the data selectively, wherein the received data are not stored in a memory when a current operation timing is in a first timing interval, and the received data are stored in the memory when the current operation timing is in a second timing interval; generating a beacon frame after determining whether data to be transmitted to the WLAN clients are stored in the memory according to a beacon frame generation interval; transmitting the generated beacon frame to the WLAN clients every beacon interval; and, when the transmission of data stored in the memory during the second timing interval is requested from the WLAN clients, transmitting the appropriate data to the WLAN clients.

Abstract: A complex wireless service arrangement using wired or wireless communication systems allows, with a terminal device, a service using a broadband mobile communication system when the terminal device is positioned in a public wireless network (e.g., broadband wireless service network), and a service using a wired and wireless complex gateway where a home or private (narrowband wireless service) wireless technique such as WLAN, Bluetooth, UWB or the like is available, and a wired communication system such as xDSL/Ethernet/POTS or the like in an inbuilding/inhouse area. A call drop is prevented upon moving between areas when the terminal device is busy, and allows, in the narrowband service range, a service provided in the wired and wireless complex gateway, and a service in association with a broadband wireless network via the wired network.

Abstract: A method is for supporting mobility of a WLAN voice terminal which can guarantee mobility, when a data line such as an ISDN line is used as a communication line between a switching system and access points and when the WLAN voice terminal roams from a basic service set of one access point which it intends to be associated with to a basic service set of another access point during signaling. It also guarantees mobility when the WLAN voice terminal roams from a basic service set of one access point which it is currently associated with to a basic service set of another access point during an active call.

Abstract: In a wireless LAN system, an apparatus for controlling load balance of multi-access points and a method thereof prevent load from being concentrated on a specific access point by comparatively evaluating received load values of many access points after receiving the load values from the access points, and enabling the access point having the concentrated load to reject terminal access or remove prior-accessed terminals.

Abstract: Disclosed in the present invention is a method for supporting mobility of a mobile node between subnetworks in a wireless local area network that includes a plurality of subnetworks networked through Internet and assigns a different Internet protocol (IP) address to the plural subnetworks, respectively, the method comprising the steps of: if the mobile node moves arbitrarily to a second subnetwork from a first subnetwork during communication, broadcasting a first message, in which a foreign mobile access server (MAS) of the second subnetwork includes the mobile node's medium access control (MAC) address; acquiring, at a home mobile access server of the first subnetwork, an address of the foreign mobile access server from the first message, and then transmitting a second message including an address of the home mobile access server and an Internet protocol address of the mobile node to the foreign mobile access server in reply to the first message; and routing, at the foreign mobile access server and the home