Patent ID: 6917804

Claim:
A high-speed roaming method of a wireless LAN comprising: a network; a plurality of access points provided in the network; and a mobile terminal that is radio-connected to one of said plurality of access points via a communication system using a frequency hopping, wherein each of said access points: registers previously a predetermined number of access points out of respective neighboring access points as neighboring access points; sends out hopping information thereof periodically to the network at mutually different timings; receives the hopping information of the neighboring access points out of the respective neighboring access points to construct a database; and synchronizes all of said access points in a same subnet of the network and sends out radio beacons synchronously from said access points; and wherein said mobile terminal: monitors said radio beacons of a connected access point and downloads hopping information of the neighboring access points from said connected access point; monitors radio beacons of said neighboring access points based on the hopping information; constructs the hopping information as a mobile terminal database to continuously compare radio environments; and selects and connects an access point having a best radio situation by referring the mobile terminal database of said neighboring access points when a quality of the radio beacon of said connected access point is reduced lower than a predetermined value, wherein, when said mobile terminal is not connected to said access point having said best radio situation, said mobile terminal is connected subsequently to an access point having a second best radio situation.