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S12700 V200R010C00 Configuration Guide - WLAN-AC

This document describes native AC (hereinafter referred to as WLAN AC) configuration procedures and provides configuration examples.
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Band Steering

Band Steering

Overview

Most STAs support both 5 GHz and 2.4 GHz frequency bands but usually associate with the 2.4 GHz radio by default when connecting to the network. As a result, the 2.4 GHz frequency band with fewer channels is congested, heavily-loaded, and has severe interference. The 5 GHz frequency band with more channels and less interference is not well used. When the 2.4 GHz frequency band has many users or severe interference, the 5 GHz frequency band can provide better access service for wireless users. Users must manually select the 5 GHz radio to connect to it.

The band steering function enables an AP to steer STAs to the 5 GHz radio first, which reduces traffic load and interference on the 2.4 GHz radio and improves user experience.

NOTE:

To implement band steering, an AP must have the same SSID and security policy on the 5 GHz and 2.4 GHz radios.

Implementation

Figure 7-8 shows the implementation of band steering, involving two phases:
Figure 7-8  Band steering

  1. 5G-prior access

    Before the number of access STAs on an AP exceeds the start threshold for load balancing between radios, the AP preferentially connects a new STA to the 5 GHz radio.

    As shown in the figure, when the AP receives a Probe Request frame from the STA (STA_1), it checks the radio that receives the frame. If the Probe Request frame is received by the 5 GHz radio, the AP returns a Probe Response frame. The STA then associates with the 5 GHz radio, and the AC records the supported frequency band of the STA as the 5 GHz frequency band.

    If the 2.4 GHz radio continuously receives Probe Request frames but the 5 GHz radio does not receive any, the AP returns a Probe Response frame through the 2.4 GHz radio. The STA then associates with the 2.4 GHz radio, and the AC records the supported frequency band of the STA as the 2.4 GHz frequency band.

    When STA_1 associates with the AP again, the AP first checks the frequency band supported by the STA. If STA_1 supports only the 2.4 GHz frequency band, the AP immediately permits the STA to access the 2.4 GHz radio.

  2. Load balancing between radios

    After the number of access STAs on an AP exceeds the start threshold for load balancing between radios, the AP determines the radio to which the STA connects based on the difference between the number of access STAs on the 2.4 GHz radio and that on the 5 GHz radio.

For example, if a STA requests to associate with the AP on the 2.4 GHz radio but the number of access STAs on the AP has exceeded the start threshold for load balancing between radios, the AP implements load balancing between the 2.4 GHz and 5 GHz radios according to the value computed based on the formula: (Number of access STAs on the 5 GHz radio – Number of access STAs on the 2.4 GHz radio)/Number of access STAs on the 5 GHz radio x 100%. If the value is greater than the load difference threshold, the AP preferentially associates with the STA on the 2.4 GHz radio; otherwise, the AP preferentially associates with the STA on the 5 GHz radio.

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Updated: 2019-04-20

Document ID: EDOC1000142094

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