I have some questions on the Coverage Index whose definition is copied here for reference.
"
Coverage Index: The AP uses this metric to measure RF coverage. The coverage index is calculated as
x/y, where "x" is the AP’s weighted calculation of the Signal-to-Noise Ratio (SNR) on all valid APs on a
specified 802.11 channel, and "y" is the weighted calculation of the Aruba APs SNR the neighboring APs
see on that channel."
1. Is x calculated as follows? An AP1 listens for beacons (or other traffic if there is any) from all other APs it can hear on the same channel, calculates the SNR (in dB) for each, and sums them. The final sum, x, includes AP1s own SNR (based on its current Tx power). This implies a channel has already been selected.
2. Is y calculated as follows? It is the sum of the SNR for all the other APs excluding itself (AP1).
3. Is this information then collected by the controller (from all APs) which then applies an algorithm to determine the new Tx power level for each AP? Is there any publicly available documentation on this algorithm?
4. The default coverage index is 10. If we are dealing in dB, does this mean that x >= y + 10? Was this value chosen to minimize CCI?
Thanks.