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High-speed roaming method of wireless LAN

  • US 6,917,804 B2
  • Filed: 07/10/2001
  • Issued: 07/12/2005
  • Est. Priority Date: 07/11/2000
  • Status: Active Grant
First Claim
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1. 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.

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