• SonicOS 7.1 Access Points
• About SonicOS
  • About SonicOS
  • SonicOS Workflow
  • How to Use the SonicOS Administration Guides
  • Guide Conventions
• About Access Points
• Settings
  • Synchronize Access Points
  • Provisioning Overview
  • Creating/Modifying Provisioning Profiles
    • Adding/Editing a Provisioning Profile - Getting Started
    • General Settings for Provisioning Profiles
    • 5GHz/2.4GHz Radio Basic Settings for Provisioning Profiles
      • Radio Settings
      • Wireless Security
      • Protected Management Frames (PMF Option)
      • About Local Radius Servers and EAP Authentication Balancing
      • Configuring Radius Server Settings
      • ACL Enforcement
      • Remote MAC Address Access Control Settings
    • 5GHz/2.4GHz Radio Advanced Settings for Provisioning Profiles
      • Configuring the RSSI Threshold
      • Configuring IEEE802.11r Settings for Secure Fast Roaming
      • Configuring IEEE802.11k Settings for Dynamic Radio Management
      • Configuring IEEE802.11v Settings for Dynamic Environment Management
    • Sensor Settings for WIDP in Provisioning Profiles
    • Mesh Network Settings for Provisioning Profiles
      • Setting Up a Mesh Network
      • Enabling a Multi-hop Mesh Network
      • Active/Active Clustering Full Mesh
    • 3G/4G/LTE WWAN Settings for Provisioning Profiles
      • Manually Configuring the 3G/4G/LTE WWAN Profile
      • Configuring Load Balancing among Multiple USB Modems
    • Bluetooth LE Settings for Provisioning Profiles
    • Deleting Access Point Profiles
    • Product Specific Configuration Notes
  • Managing Access Point Objects
    • Deleting Access Point Objects
    • Rebooting Access Point Objects
    • Modifying Access Point Objects
• Firmware Management
  • About Firmware Management
  • Obtaining the Latest SonicWall Firmware
  • Downloading Firmware from a Specific URL
  • Uploading Firmware to an Access Point
• Floor Plan View
  • Managing the Floor Plans
    • Selecting a Floor Plan
    • Creating a Floor Plan
    • Editing a Floor Plan
  • Managing Access Points
    • Available Devices
    • Added Access Points
    • Removing Access Points
    • Export Image
    • Context Menu
• Station Status
• Intrusion Detection Services
  • Scanning Access Points
  • Authorizing Access Points
• Advanced IDP
  • Enabling Wireless IDP on a Profile
  • Configuring Wireless IDP Settings
  • Viewing KRACK Sniffer Packets
• Packet Capture
• Virtual Access Points
  • Before Configuring VAPs
    • Determining Your VAP Needs
    • Determining Security Configurations
    • Sample Network Definitions
    • Prerequisites
    • VAP Configuration Worksheet
  • Access Point VAP Configuration Task List
  • Virtual Access Point Groups
  • Virtual Access Point Objects
    • General Tab
    • Advanced Tab
  • Virtual Access Point Profiles
    • Virtual Access Point Schedule Settings
    • Virtual Access Point Profile Settings
    • Remote MAC Address Access Control Settings
    • ACL Enforcement
    • IEEE802.11R Settings
    • IEEE802.11K Settings
    • IEEE802.11V Settings
    • Agile Multiband Settings
• RF Monitoring
  • Prerequisites
  • RF Monitoring Summary
  • 802.11 General Frame Setting
  • 802.11 Management Frame Setting
  • 802.11 Data Frame Setting
  • Discovered RF Threat Stations
  • Adding a Threat Station to the Watch List
  • Practical RF Monitoring Field Applications
    • Using Sensor ID to Determine RF Threat Location
    • Using RSSI to Determine RF Threat Proximity
• RF Analysis
  • Using RF Analysis on SonicWall Access Points
    • Understanding the RF Score
    • Channel Utilization Graphs and Information
    • Viewing Overloaded Channels
    • RFA Highly Interfered Channels
• RF Spectrum
• FairNet
  • Supported Platforms
  • FairNet Features
  • Management Interface Overview
  • Configuring FairNet
• Wi-Fi Multimedia
  • WMM Access Categories
  • Assigning Traffic to Access Categories
  • Configuring Wi-Fi Multimedia Parameters
    • Configuring WMM
    • Creating a WMM Profile for an Access Point
• 3G/4G/LTE WWAN
• Bluetooth LE Devices
  • Viewing BLE Scanned Data
• Radio Management
  • Configuring Radio Management
  • Configuring Dynamic Channel Selection Settings
• SonicWall Support
  • About This Document

Configuring the RSSI Threshold

In areas large enough to require multiple access points to provide good WiFi coverage across the whole area, you would expect a WiFi client to detect and move to the closest access point. Unfortunately, many WiFi clients tend to hang on to the original access point they associated with, rather than moving to a nearby access point that would generally be a better choice for them. This is referred to as sticky behavior and results in a low RSSI (Received Signal Strength Indicator) and a high SNR (Signal-to-Noise Ratio). The farther away from the original access point the client moves, the weaker its RSSI gets and the worse its SNR gets. Retransmissions occur, dynamic rate-shifting happens, and the client communicates at a much lower data-rate. A lower data-rate consumes more air-time to transfer the same information, resulting in higher channel utilization. Ideally, the client would roam to the closest access point, and the resulting RF space would be better for everyone.

RSSI thresholds are supported. When the client reaches a certain RSSI level from the perspective of the access point, the access point disassociates from the client and the client then associates to a closer access point. The RSSI threshold is configurable.

RSSI measurements represent the relative quality of a received signal on a device after any possible loss at the antenna and cable level. The higher the RSSI value, the stronger the signal. When measured in negative numbers, the number that is closer to zero usually means better signal. As an example, -50 dBm is a pretty good signal, -75 dBm is fairly reasonable, and -100 dBm is no signal at all.