Zebra recommends enabling, if possible, the Preferred Scanning Channels (PSC) Enforcement on the WLAN Controller.
Zebra recommends enabling the PSC Enforcement feature, which is disabled by default on the controller. This expedites the controller's ability to find (scan), connect, and roam in the network.
In countries where UNII-5, 6, 7, 8 frequency ranges are enabled, the 6 GHz band provides 59 additional 20 MHz channels. Within those 59 channels, 15 are PSC channels. A Zebra device scanning on all the 59 channels will take 60% more time to complete the scan and find the best available network, compared to scanning on only the 15 PSC channels. Also, the device must scan on legacy bands (both 2.4 GHz and 5 GHz) in an environment where the WLAN supports all bands.
For faster network discovery during initial connection, as well as while roaming, Zebra recommends enabling “PSC Enforcement” option on the controller so the 6 GHz network will utilize 15 PSC channels to optimize the discovery and connection to a network.
In countries where only UNII-5 frequency is allowed, such as countries in the European Union, the WLAN can be operational on up to 24 6GHz channels of 20 MHz width. Within those 24 channels, six are PSC channels. If the WLAN deployment prefers not to enable “PSC Enforcement” such that more channels are operational (due to the UNII limitation), Zebra then recommends that 11k be enabled on the WLAN for optimal network discovery. The RNR discovery mechanism is used under the hood to facilitate the discovery of all the 6GHz channels, PSC and non-PSC alike.
