Samsung Electronics Co., Ltd.

Seon-Soo Rue

Gui-Jung Lee

Gui-Jung 521-1602 Jinsan-Maeul Lee

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.

Wireless LAN network, and mobile station, base station and method of controlling handoff in wireless LAN network to prevent packet loss during handoff

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.

Method and system for supporting mobility of mobile terminal

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 mobile access server, the mobile node's data by using the other party's address.

Apparatus and method for supporting mobility between subnetworks of mobile node in wireless LAN

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. As a result, power consumption by remote stations is minimized.

Method and system for performing data transmission process of an access point (AP) supporting power management of wireless local area network (WLAN) clients, and AP for performing the same

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Suwon-si, South Korea

Seon-Soo Rue