Increasing the mandatory minimum data rates is a primary technique for tuning the effective cell size of an Access Point (AP). A wireless client must be able to support all mandatory (or "basic") data rates to associate with an AP. By disabling the lowest data rates (e.g., 1, 2, 5.5, 11 Mbps) and setting a higher minimum mandatory rate (e.g., 12 or 24 Mbps), clients at the edge of the cell with weak signals can no longer maintain the required connection. This forces the client to disassociate from the distant AP and initiate a roam to a closer AP with a stronger signal, directly mitigating the "sticky client" problem common in dense RF environments.

A. Decrease radio channel widths to 40 MHz.

This action primarily reduces co-channel interference and is a good practice in dense environments, but it does not directly influence a client's roaming decision to solve the sticky client issue.

C. Decrease the mandatory minimum data rates.

This would have the opposite effect, enlarging the AP's effective cell size and allowing clients to remain connected at greater distances with weaker signals, thus worsening the sticky client problem.

D. Increase radio channel widths to 160 MHz.

This increases potential throughput but also significantly increases the potential for co-channel interference, especially in dense deployments. It does not address client roaming behavior.

1. Cisco

High Density Wi-Fi Design and Deployment Guide (Dec 19

2019). In the "Data Rates" section

it states: "Disabling the lower data rates helps to reduce the cell size of the APs... This can help with 'sticky' clients that tend to hang on to a distant AP by forcing them to roam to a closer AP." (Section: Design for High Density

Subsection: Data Rates).

2. Cisco

Enterprise Mobility 8.5 Design Guide (December 20

2019). Chapter 3

"Wireless LAN RF Design Considerations

" discusses RF tuning. The section "Data Rates" explains: "Setting the lowest data rate to mandatory forces a client to be able to receive the packet at that data rate... Disabling the lower data rates can be used to reduce the cell size and force clients to roam to a closer AP."

3. Cisco

Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide

Cisco IOS XE Bengaluru 17.6.x. The "Configuring Data Rates" chapter details the process: "By default

the 802.11b/g data rates of 1

2

5.5

and 11 Mbps are disabled... Disabling lower data rates can help to reduce the number of sticky clients." (Chapter: Configuring Radio Settings

Section: Configuring Data Rates).