Wireless LAN terminal and handover method thereof
View Patent ↗There is provided a wireless LAN terminal and a handover method thereof for resolving a sound cutoff and image cutoff which occur when a terminal is moved. The wireless LAN terminal stores BSSID of wireless LAN access points and a frame control in a MAC header of a communication frame in advance. In case of switching a wireless LAN access point for communication, the wireless LAN terminal replaces BSSID of a wireless LAN access point of a communication frame so as to continue the communication.
1. A wireless local area network (LAN) system, comprising:
a wireless LAN terminal; and
a plurality of wireless LAN access points each having an identical ESSID (Extended Service Set Identifier) and sharing wireless LAN terminal information that comprises a MAC address, security information and a time stamp of the wireless LAN terminal which has been authenticated,
wherein said wireless LAN terminal
stores a MAC (Media Access Control) header of a communication frame that includes a BSSID (Basic Service Set Identifier) for said each of said plurality of wireless LAN access points, wherein said each of said plurality of wireless LAN access points is configured to communicate with the wireless LAN terminal without requiring authorization when any one of said plurality of wireless LAN access points has been authorized, and
a frame control for which said advance authorization with said any one of said plurality of wireless LAN access points has been completed, and
further wherein,
in case of switching from a first wireless LAN access point of said plurality of wireless LAN access points to a second wireless LAN access point of said plurality of wireless LAN access points, said wireless LAN terminal replaces, in the MAC header of the communication frame to be transmitted, a first BSSID of a said first wireless LAN access point with a second BSSID of said second wireless LAN access point, using said frame control without change with respect to the plurality of LAN access points, in the communication frame to be transmitted, and continues communication without requiring authentication.
2. The wireless LAN system according to claim 1 , wherein said wireless LAN terminal:
collects beacons from said plurality of wireless LAN access points, and forms a table in which a BSSID for each of said plurality of wireless LAN access points is registered from information related to said beacons; and
completes an authentication through said one of said plurality of wireless LAN access points, and stores said frame control of said MAC header of said communication frame for which advance authorization with said any one of said plurality of wireless LAN access points has been completed.
3. The wireless LAN system according to claim 1 , wherein said wireless LAN terminal
comprises a wireless LAN driver, and said wireless LAN terminal
stores a MAC header including a BSSID for said each of said plurality of wireless LAN access points and said frame control of said communication frame in the wireless LAN driver.
4. A handover method of a wireless LAN terminal, comprising:
storing a MAC (Media Access Control) header of a communication frame including a BSSID (Basic Service Set Identifier) for each of a plurality of wireless LAN access points, said plurality of wireless access points configured to perform communication with the wireless LAN terminal without requiring authorization when any one of said plurality of wireless LAN access points has been authorized, and a frame control for which said authorization with said any one of said plurality of wireless LAN access points has been completed, wherein said plurality of wireless LAN access points have identical ESSID (Extended Service Set Identifier) and share wireless LAN terminal information which includes a MAC address, security information and a time stamp of the wireless LAN terminal which has been authenticated; and
in case of switching from a first of said plurality of wireless LAN access points to a second of said plurality of wireless LAN access points, replacing, in the MAC header of the communication frame to be transmitted, a first BSSID of said first wireless LAN access point with a second BSSID of said second wireless LAN access point, using said frame control without change, in the communication frame to be transmitted, and continuing communication without requiring authentication.
5. The handover method of a wireless LAN terminal according to claim 4 , further comprising:
collecting beacons from said plurality of wireless LAN access points, and forming a table in which said BSSID for each of said plurality of wireless LAN access points is registered from beacon information by the wireless LAN terminal; and
completing an authentication through one of said plurality of wireless LAN access points, and storing a frame control of the MAC header of the communication frame for which said authorization with said any one of said plurality of wireless LAN access points has been completed.
6. The handover method for a wireless LAN terminal according to claim 4 , further including:
storing a MAC header including said BSSID for each of said plurality of wireless LAN access points and said frame control of said communication frame in a wireless LAN driver.