Vertical roaming in wireless networks through improved quality of service measures
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United States of America Patent
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Aug 15, 2006
Grant Date -
Mar 31, 2005
app pub date -
Oct 18, 2004
filing date -
Feb 28, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and method for vertical handoff between different types of wireless networks. A network allocation vector of a first wireless network is sampled for a period of time. The network allocation vector may include a transmission time advertised by a sender in the first wireless network. A network allocation vector occupation is calculated. The calculation of the network allocation vector may include calculating a ratio of an amount of time that the network allocation vector is busy during the time period to a total amount of time during the time period. A wireless network quality of service measure is calculated as a function of the network allocation vector occupation. A vertical handoff may be initiated from a second wireless network to the first wireless network based at least in part on the calculated wireless network quality of service measure.
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