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RSSI which determines the signal strength of the client towards AP, can have a threshold value which will help in directing/deciding as to which band the client needs to be connected to. Signal strength indirectly indicates the distance of the client from AP. It is understood that as RSSI decreases, the distance of client device from the AP increases.

Approach

RSSI is determined by the iwconfig command

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Signal Level=37/100 is the RSSI in arbitrary unit, has to be converted to dbm.

Command to obtain Signal Level value for multiple client:

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iwlist <interface> frequency | grep "Current Frequency" | cut -d ':' -f2 | cut -d ' ' -f1Based on Cisco chart for conversion of arbitary unit to dbm:

RSSI above 67: dbm = 1.2*RSSI – 123

or

RSSI between 36 and 66: dbm = 1.1*RSSI – 114.6

or

RSSI below 35: dbm = 1*RSSI - 112

RSSI threshold:

RSSI threshold is set to -100 by default, based on the Real time Box behaviour.

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Assuming, all wireless devices that support both 2.4GHz and 5GHz band will be automatically directed, to be connected to 5GHz initially. Here, if the number of clients connected to 5GHz is more than the set threshold value, i.e., 10, then network quality may degrade for the connected clients because many clients will be sharing the available band. For this, once the number of connected clients crosses threshold, few of the clients have to be steered to 2.4GHz.

Depends on:

a. More Density/Number of Clients in the Band

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