Controlling micro-roaming in a wireless LAN

Details Controlling micro-roaming in a wireless LAN Controlling micro-roaming in a wireless LAN

2004-05-21

2008-10-21

Feild, Joseph (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S525000

Reexamination Certificate

active

07440756

ABSTRACT:
The present invention detects a micro-roaming client in a WLAN. Once a micro-roaming client is detected, APs coordinate with each other and assign the client to a specific AP. In an embodiment, a user-configurable anchor timer for micro-roaming clients is provided, so that when the timer has expired, the client is free to roam within the overlapping cell until it becomes anchored to an AP again. In various embodiments, environmental variables can affect APs to release an anchored client to roam again. These environmental variables may include low RSSI from the client, a high percentage of frame loss to the client, or a low data rate. The present invention also provides a new protocol that is resilient and self-sustaining with minimal user configuration required.

REFERENCES:
patent: 5901362 (1999-05-01), Cheung et al.
patent: 6067297 (2000-05-01), Beach
patent: 2001/0046223 (2001-11-01), Malki et al.
patent: 2004/0039831 (2004-02-01), Grimminger
patent: 2004/0203781 (2004-10-01), Lefkowitz
patent: 2004/0246933 (2004-12-01), Valko et al.
patent: 2005/0013316 (2005-01-01), Liao et al.

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