High-speed roaming method of wireless LAN
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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Abstract
All access points are operated synchronously, and monitor the beacon to mate with the hopping frequency of the neighboring access point. Accordingly, the station can grasp the up-to-date radio situation of the neighboring access point to be entered subsequently, and constructs the information as the database. As a result, when the beacon quality of the current subscription (connected) access point is reduced lower than the threshold value, the hopping channel and the hopping pattern are fitted to the neighboring access point having the best communication environment by referring the database, and then the subscription operation is applied directly.
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Citations
23 Claims
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1. A high-speed roaming method of a wireless LAN comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification