Patent ID: 8897777

Claim:
A hand-over method of a mobile device roaming in a wireless local area network (LAN) environment, the method comprising: receiving global positioning system (GPS) information of the mobile device; based on the received GPS information of the mobile device, identifying by the mobile device at least one access point (AP) other than the existing AP, to which the mobile device is currently connected, to be scanned for; by scanning for the identified AP, detecting by the mobile device an AP to reassociate with; and reassociating the mobile device with the detected AP, wherein the identifying by the mobile device of the at least one AP comprises: estimating a moving direction or moving path of the mobile device by using a plurality of GPS information items; and obtaining information on at least one AP included in a predetermined searching range on the basis of the estimated moving direction or moving path, from a channel table stored in the mobile device including location information of APs on a plurality of channels, wherein the scanning for the at least one identified AP includes hierarchically scanning for one or more identified APs through plural increasing and overlapping searching ranges, including the predetermined searching range, in different scanning operations until the identified AP to reassociate with is detected.