VoWLAN roaming controller with station pre-authentication

Details VoWLAN roaming controller with station pre-authentication VoWLAN roaming controller with station pre-authentication

2007-07-07

2011-11-01

Eng, George (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S341000, C455S442000, C455S436000

Reexamination Certificate

active

08050230

ABSTRACT:
A method of triggering handoff of a mobile station to a candidate BSS, for VoWLAN communication, uses a roaming controller for monitoring link qualities of the serving and candidate BSS by selective/controlled fast scanning through RSSI screening at each packet reception. Using link qualities, a list of candidate BSSs for handoff is maintained. The controller selects a candidate BSS for handoff and completes pre-authentication of the mobile station with the selected best candidate BSS. When the link quality of the of the selected candidate BSS becomes better than that of the serving BSS, handoff is triggered. Link qualities may be monitored by screening a metric other than RSSI. When no candidate BSS is found, scanning is reduced/temporarily interrupted, to conserve power. When the serving BSS link quality is above a given threshold when the mobile station is in the serving BSS center, the functions of fast scanning and pre-authentication are interrupted.

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