Method and mobile device for performing fast hand-over in WLAN and method of switching services using GPS information

摘要

A fast hand-over method of a mobile device roaming in a wireless LAN environment includes: receiving GPS information; based on the received location information of the mobile device, searching one or more APs; by scanning the searched APs, detecting an AP to reassociate with; and reassociating with the detected AP. According to the method, when roaming in a wireless LAN environment, a mobile device calculates a moving path by using GPS information and then, by scanning only APs belonging to channels allocated to areas related to the moving direction, the mobile device can reduce a hand-over period, and as a result, a QoS guaranteed service can be provided continuously. Also, by using GPS information, the mobile device can selectively switch to an optimum network service in an area to which different network services are applied.

主权项

1. 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.