Cell Size Control Settings

These AP settings help improve network connectivity. They can be set at the device group level or as an AP Override setting.

Table 1. Cell Size Control Settings
Field Description
Probe Suppression on Low RSS Reduces the number of probe responses by preventing clients with low RSS from associating with an AP radio. This setting is configured per radio. Clients with RSS measured below the Probe Suppression RSS Threshold will not associate with the AP. This setting is disabled by default.
Disassociate on Low RSS This setting is supported on AP39xx, AP3xx, AP4xx, or AP5xx. It is always disabled by default. This setting forces clients with low RSS to disassociate from an AP radio. This setting is configured per radio. A client is forced off an AP radio when RSS is measured at 5dBm below the Probe Suppression RSS Threshold. Enabling this option forces a client to roam to a better AP for improved network performance.
Probe Suppression RSS Threshold (dBm) This setting is available when Probe Suppression on Low RSS is enabled. This setting determines the RSS threshold for forced disassociation and probe suppression. The default threshold is -90 dBm. Valid value range is -50dBm to -100dBm.

Best Practice: Probe Suppression Threshold should not be greater than -70dB. The Probe Suppression Threshold defines the signal strength value that is deemed too low to be acknowledged by the AP. Setting the threshold above -70dB can result in an AP not acknowledging clients in close proximity, leading to poor connectivity or a sub-optimal roaming experience. The best practice is to follow the Site Survey methodology to determine the best value for the AP installation.

Probe Response Retry Limit The default Probe Response Retry Limit is 4. If devices are having a problem connecting to the network, due to congestion or due to the quality of the device, consider increasing the retry limit. Maximum value is 10.
Rx Sensitivity Reduction (dB) New APs are very sensitive and can pick up unwanted channel interference. If this is an issue, add an offset of 5-10 dB, which will reduce signal sensitivity and improve signal quality.