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... place1
Notice that in the case of the initial affiliation the client will be able to identify the AP that offers the highest potential bandwidth on any frequency. In the case of roaming, the client will be able to quantify potential bandwidth only for the APs residing in the same frequency.
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... frame2
If the AP has multi-rate support, then the current sending rate $R$ of the AP can easily be inferred from the duration fields in the data frames transmitted by the AP.
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